<?php
defined('BASEPATH') or exit('No direct script access allowed');

class Home extends CI_Controller
{

    public function __construct()
    {
        parent::__construct();
        // Your own constructor code
        $this->load->database();
        $this->load->library('session');
        // $this->load->library('stripe');
        /*cache control*/
        $this->output->set_header('Cache-Control: no-store, no-cache, must-revalidate, post-check=0, pre-check=0');
        $this->output->set_header('Pragma: no-cache');

        // CHECK CUSTOM SESSION DATA
        $this->user_model->check_session_data();


        //CHECKING COURSE ACCESSIBILITY STATUS
        if(get_settings('course_accessibility') != 'publicly' && !$this->session->userdata('user_id')){
            redirect(site_url('login'), 'refresh');
        }

        //If user was deleted
        if($this->session->userdata('user_login') && $this->user_model->get_all_user($this->session->userdata('user_id'))->num_rows() == 0){
            $this->user_model->session_destroy();
        }

        ini_set('memory_limit', '1024M');
    }
    public function index()
    {
        $this->home();
    }

    

    public function home()
    {
        $page_data['page_name'] = "home";
        $page_data['page_title'] = site_phrase('home');
        $this->load->view('frontend/' . get_frontend_settings('theme') . '/index', $page_data);
    }

    //send gift
    public function shopping_cart($gift_status = "")
    {
        if (!$this->session->userdata('cart_items')) {
            $this->session->set_userdata('cart_items', array());
        }

        //send gift
        $this->session->unset_userdata('send_gift_to_id');
        if($gift_status){
            if($gift_status == 'gift'){
            $page_data['gift_status'] = 'gift';        
            }
        }
        $page_data['page_name'] = "shopping_cart";
        $page_data['page_title'] = site_phrase('shopping_cart');
        $this->load->view('frontend/' . get_frontend_settings('theme') . '/index', $page_data);
    }

    public function courses()
    {
        if (!$this->session->userdata('layout')) {
            $this->session->set_userdata('layout', 'list');
        }
        $layout = $this->session->userdata('layout');
        $selected_category_id = "all";
        $selected_price = "all";
        $selected_level = "all";
        $selected_language = "all";
        $selected_rating = "all";
        $selected_sorting = "newest";
        $search_string = "";

        $scorm_status = addon_status('scorm_course');
        $h5p_status = addon_status('h5p');

        // check script inject
        if (isset($_GET) && count($_GET) > 0) {
            foreach($_GET as $key => $value){
                //check double quote and script text in the search string
                if(preg_match('/"/', strtolower($value)) >= 1 && strpos(strtolower($value),"script") >= 1){
                    $this->session->set_flashdata('error_message', site_phrase('such_script_searches_are_not_allowed').'!');
                    redirect(site_url('home/courses'), 'refresh');
                }
            }
        }

        // Script check
        if (isset($_GET['sort_by']) && !empty($_GET['sort_by'])) {
            //check double quote and script text in the search string
            if(preg_match('/"/', $_GET['sort_by']) >= 1 && strpos($_GET['sort_by'],"script") >= 1){
                $this->session->set_flashdata('error_message', site_phrase('such_script_searches_are_not_allowed').'!');
                redirect(site_url('home/courses'), 'refresh');
            }
        }

        // Get the category ids
        if (isset($_GET['category']) && !empty($_GET['category'] && $_GET['category'] != "all")) {
            $selected_category_id = $this->crud_model->get_category_id($_GET['category']);
        }

        // Get the selected price
        if (isset($_GET['price']) && !empty($_GET['price'])) {
            $selected_price = $_GET['price'];
        }

        // Get the selected level
        if (isset($_GET['level']) && !empty($_GET['level'])) {
            $selected_level = $_GET['level'];
        }

        // Get the selected language
        if (isset($_GET['language']) && !empty($_GET['language'])) {
            $selected_language = $_GET['language'];
        }

        // Get the selected rating
        if (isset($_GET['rating']) && !empty($_GET['rating'])) {
            $selected_rating = $_GET['rating'];
        }

        // Get the selected rating
        if (isset($_GET['sort_by']) && !empty($_GET['sort_by'])) {
            $selected_sorting = $_GET['sort_by'];
        }


        if ($search_string == "" && $selected_category_id == "all" && $selected_price == "all" && $selected_level == 'all' && $selected_language == 'all' && $selected_rating == 'all' && $selected_sorting == 'newest') {

            $this->db->group_start();
                $this->db->where('course_type', 'general');
                if ($scorm_status) {
                    $this->db->or_where('course_type', 'scorm');
                }
                if ($h5p_status) {
                    $this->db->or_where('course_type', 'h5p');
                }
            $this->db->group_end();
            $this->db->where('status', 'active');
            $total_rows = $this->db->get('course')->num_rows();
            $config = array();
            $config = pagintaion($total_rows, 9);
            $config['base_url']  = site_url('home/courses/');
            $this->pagination->initialize($config);


            $this->db->group_start();
                $this->db->where('course_type', 'general');
                if ($scorm_status) {
                    $this->db->or_where('course_type', 'scorm');
                }
                if ($h5p_status) {
                    $this->db->or_where('course_type', 'h5p');
                }
            $this->db->group_end();

            $this->db->group_start();
            $this->db->where('status', 'active');
            $this->db->group_end();
            //sorting randomly
            //$this->db->order_by(6, 'RANDOM');
            $this->db->order_by('id', 'desc');

            $page_data['courses'] = $this->db->get('course', $config['per_page'], $this->uri->segment(3))->result_array();
            $page_data['total_result'] = $total_rows;
        } else {
            $category_slug = isset($_GET['category']) ? $_GET['category'] : 'all';

            if($search_string != ""){
                $search_string_val = "query=".$search_string."&";
            }else{
                $search_string_val = "";
            }

            $all_filtered_courses = $this->crud_model->filter_course($search_string, $selected_category_id, $selected_price, $selected_level, $selected_language, $selected_rating)->num_rows();
            $config = array();
            $config = pagintaion($all_filtered_courses, 9);
            $config['base_url']  = site_url('home/courses/');

            $config['suffix']  = '?'.$search_string_val.'category=' . $category_slug . '&price=' . $selected_price . '&level=' . $selected_level . '&language=' . $selected_language . '&rating=' . $selected_rating . '&sort_by=' . $selected_sorting;
            $config['first_url']  = site_url('home/courses').'?'.$search_string_val.'category=' . $category_slug . '&price=' . $selected_price . '&level=' . $selected_level . '&language=' . $selected_language . '&rating=' . $selected_rating . '&sort_by=' . $selected_sorting;

            $this->pagination->initialize($config);
            $courses = $this->crud_model->filter_course($search_string, $selected_category_id, $selected_price, $selected_level, $selected_language, $selected_rating, $selected_sorting, $config['per_page'], $this->uri->segment(3))->result_array();
            $page_data['courses'] = $courses;
            $page_data['total_result'] = $all_filtered_courses;
        }

        $page_data['page_name']  = "courses_page";
        $page_data['page_title'] = site_phrase('courses');
        $page_data['layout']     = $layout;
        $page_data['selected_category_id']     = $selected_category_id;
        $page_data['selected_price']     = $selected_price;
        $page_data['selected_level']     = $selected_level;
        $page_data['selected_language']     = $selected_language;
        $page_data['selected_rating']     = $selected_rating;
        $this->load->view('frontend/' . get_frontend_settings('theme') . '/index', $page_data);
    }

    public function set_layout_to_session()
    {
        $layout = $this->input->post('layout');
        $this->session->set_userdata('layout', $layout);

        echo json_encode(['reload' => true]);
    }

    public function course($slug = "", $course_id = "")
    {
        //course_addon start


        if (addon_status('affiliate_course')) {
            if (isset($_GET['ref'])) {
                $CI    = &get_instance();
                $CI->load->model('addons/affiliate_course_model');
                $affiliator_details_for_checking_active_status = $_GET['ref'];
                $check_validity = $CI->affiliate_course_model->get_user_by_unique_identifier($affiliator_details_for_checking_active_status);
           
                if ($check_validity['status'] == 1 && $check_validity['user_id']!=$this->session->userdata('user_id')) {

                    if (isset($_GET['ref'])) {
                        $this->session->set_userdata('course_referee', $_GET['ref']);
                        $this->session->set_userdata('course_reffer_id', $course_id);
                    } elseif ($this->session->userdata('user_id') != $course_id) {
                        $this->session->unset_userdata('course_referee');
                        $this->session->unset_userdata('course_reffer_id');
                    }
                }
                else
                {
                    $this->session->set_flashdata('error_message', get_phrase('you can not reffer yourself'));
                    redirect(site_url('home/courses'), 'refresh');
            
                }
            }
        }
        



        //course_addon end 


        $this->access_denied_courses($course_id);
        $page_data['course_id'] = $course_id;
        $page_data['page_name'] = "course_page";
        $page_data['page_title'] = site_phrase('course');

    
        $this->load->view('frontend/' . get_frontend_settings('theme') . '/index', $page_data);
    }

    public function instructor_page($instructor_id = "")
    {
        $page_data['page_name'] = "instructor_page";
        $page_data['page_title'] = site_phrase('Educator Profile');
        $page_data['instructor_id'] = $instructor_id;
        $this->load->view('frontend/' . get_frontend_settings('theme') . '/index', $page_data);
    }

    public function my_courses()
    {
        if ($this->session->userdata('user_login') != true) {
            redirect(site_url('home'), 'refresh');
        }

        $page_data['page_name'] = "my_courses";
        $page_data['page_title'] = site_phrase("my_courses");
        $this->load->view('frontend/' . get_frontend_settings('theme') . '/index', $page_data);
    }

    public function my_messages($param1 = "", $param2 = "")
    {
        if ($this->session->userdata('user_login') != true) {
            redirect(site_url('home'), 'refresh');
        }
        if ($param1 == 'read_message') {
            $page_data['message_thread_code'] = $param2; // $param2 = message_thread_code
            $this->crud_model->mark_thread_messages_read($param2);
        } elseif ($param1 == 'send_new') {
            $message_thread_code = $this->crud_model->send_new_private_message();
            $this->session->set_flashdata('flash_message', site_phrase('message_sent'));
            redirect(site_url('home/my_messages/read_message/' . $message_thread_code), 'refresh');
        } elseif ($param1 == 'send_reply') {
            $this->crud_model->send_reply_message($param2); //$param2 = message_thread_code
            $this->session->set_flashdata('flash_message', site_phrase('message_sent'));
            redirect(site_url('home/my_messages/read_message/' . $param2), 'refresh');
        }
        $page_data['page_name'] = "my_messages";
        $page_data['page_title'] = site_phrase('my_messages');
        $this->load->view('frontend/' . get_frontend_settings('theme') . '/index', $page_data);
    }

    public function my_notifications()
    {
        $page_data['page_name'] = "my_notifications";
        $page_data['page_title'] = site_phrase('my_notifications');
        $this->load->view('frontend/' . get_frontend_settings('theme') . '/index', $page_data);
    }

    public function my_wishlist()
    {
        if (!$this->session->userdata('cart_items')) {
            $this->session->set_userdata('cart_items', array());
        }
        $my_courses = $this->crud_model->get_courses_by_wishlists();
        $page_data['my_courses'] = $my_courses;
        $page_data['page_name'] = "my_wishlist";
        $page_data['page_title'] = site_phrase('my_wishlist');
        $this->load->view('frontend/' . get_frontend_settings('theme') . '/index', $page_data);
    }

    public function purchase_history()
    {
        if ($this->session->userdata('user_login') != true) {
            redirect(site_url('home'), 'refresh');
        }

        $total_rows = $this->crud_model->purchase_history($this->session->userdata('user_id'))->num_rows();
        $config = array();
        $config = pagintaion($total_rows, 10);
        $config['base_url']  = site_url('home/purchase_history');
        $this->pagination->initialize($config);
        $page_data['per_page']   = $config['per_page'];

        if (addon_status('offline_payment') == 1) :
            $this->load->model('addons/offline_payment_model');
            $page_data['pending_offline_payment_history'] = $this->offline_payment_model->pending_offline_payment($this->session->userdata('user_id'))->result_array();
        endif;

        $page_data['page_name']  = "purchase_history";
        $page_data['page_title'] = site_phrase('purchase_history');
        $this->load->view('frontend/' . get_frontend_settings('theme') . '/index', $page_data);
    }

    public function profile($param1 = "")
    {
        if ($this->session->userdata('user_login') != true) {
            redirect(site_url('home'), 'refresh');
        }

        if ($param1 == 'user_profile') {
            $page_data['page_name'] = "user_profile";
            $page_data['page_title'] = site_phrase('user_profile');
        } elseif ($param1 == 'user_credentials') {
            $page_data['page_name'] = "user_credentials";
            $page_data['page_title'] = site_phrase('credentials');
        } elseif ($param1 == 'user_photo') {
            $page_data['page_name'] = "update_user_photo";
            $page_data['page_title'] = site_phrase('update_user_photo');
        }
        $page_data['user_details'] = $this->user_model->get_user($this->session->userdata('user_id'));
        $this->load->view('frontend/' . get_frontend_settings('theme') . '/index', $page_data);
    }

    public function update_profile($param1 = "", $is_profile_page = false)
    {
        if ($param1 == 'update_basics') {
            $this->user_model->edit_user($this->session->userdata('user_id'));
            redirect(site_url('home/profile/user_profile'), 'refresh');
        } elseif ($param1 == "update_credentials") {
            $this->user_model->update_account_settings($this->session->userdata('user_id'));
            redirect(site_url('home/profile/user_credentials'), 'refresh');
        } elseif ($param1 == "update_photo") {
            if (isset($_FILES['user_image']) && $_FILES['user_image']['name'] != "") {
                unlink('uploads/user_image/' . $this->db->get_where('users', array('id' => $this->session->userdata('user_id')))->row('image') . '.jpg');
                $data['image'] = md5(rand(10000, 10000000));
                $this->db->where('id', $this->session->userdata('user_id'));
                $this->db->update('users', $data);
                $this->user_model->upload_user_image($data['image']);
            }
            $this->session->set_flashdata('flash_message', site_phrase('updated_successfully'));

            if($is_profile_page){
                redirect(site_url('home/profile/user_profile'), 'refresh');
            }else{
                redirect(site_url('home/profile/user_photo'), 'refresh');
            }
        }
    }

    public function handleWishList($return_number = "")
    {
        if ($this->session->userdata('user_login') != 1) {
            echo false;
        } else {
            if (isset($_POST['course_id'])) {
                $course_id = $this->input->post('course_id');
                $this->crud_model->handleWishList($course_id);
            }
            if ($return_number == 'true') {
                echo sizeof($this->crud_model->getWishLists());
            } else {
                $this->load->view('frontend/' . get_frontend_settings('theme') . '/wishlist_items');
            }
        }
    }


    function toggleWishlistItems($course_id = "", $identifier = ""){
        if ($this->session->userdata('user_login') != 1) {
            $url = site_url('home/course/'.slugify($this->crud_model->get_course_by_id($course_id)->row('title')).'/'.$course_id);
            set_url_history($url);
            $response['redirectTo'] = site_url('login');
        }else{
            //sdfkudsgfdfhidhfhdfi hhj
            $response_bool = $this->crud_model->handleWishList($course_id);
            if($response_bool){
                $response['success'] = get_phrase('Course added to wishlist');
            }else{
                $response['success'] = get_phrase('Course removed from wishlist');
            }
            $response['toggleClass'] = ['elem' => '#coursesWishlistIcon'.$identifier.$course_id, 'content' => 'red-heart'];


            //Header wishlist content start
            $my_wishlist_items = array();
            if($user_id = $this->session->userdata('user_id')){
                $wishlist = $this->user_model->get_all_user($user_id)->row('wishlist');
                if($wishlist != ''){
                    $my_wishlist_items = json_decode($wishlist, true);
                }
            }
            $wishlist_content = $this->load->view('frontend/'. get_frontend_settings('theme') .'/wishlist_items', ['my_wishlist_items' => $my_wishlist_items], true);
            $response['html'] = ['elem' => '#wishlistItems', 'content' => $wishlist_content];
            $response['text'] = ['elem' => '#wishlistItemsCounter', 'content' => count($my_wishlist_items)];
            //End header wishlist content
        }

        echo json_encode($response);
    }

    public function handleCartItems($return_number = "")
    {
        if (!$this->session->userdata('cart_items')) {
            $this->session->set_userdata('cart_items', array());
        }

        $course_id = $this->input->post('course_id');
        $previous_cart_items = $this->session->userdata('cart_items');
        if (in_array($course_id, $previous_cart_items)) {
            $key = array_search($course_id, $previous_cart_items);
            unset($previous_cart_items[$key]);
        } else {
            array_push($previous_cart_items, $course_id);
        }

        $this->session->set_userdata('cart_items', $previous_cart_items);
        if ($return_number == 'true') {
            echo sizeof($previous_cart_items);
        } else {
            $this->load->view('frontend/' . get_frontend_settings('theme') . '/cart_items');
        }
    }
    public function handle_cart_items($course_id = "", $identifier = "")
    {
        if (!$this->session->userdata('cart_items')) {
            $this->session->set_userdata('cart_items', array());
        }

        $previous_cart_items = $this->session->userdata('cart_items');
        if (in_array($course_id, $previous_cart_items)) {
            $key = array_search($course_id, $previous_cart_items);
            unset($previous_cart_items[$key]);

            $response['success'] = get_phrase('Item successfully removed from cart');
            $response['hide'] = '#added_to_cart_btn_'.$identifier.$course_id;
            $response['show'] = '#add_to_cart_btn_'.$identifier.$course_id;
            
        } else {
            array_push($previous_cart_items, $course_id);

            $response['success'] = get_phrase('Item successfully added to cart');
            $response['show'] = '#added_to_cart_btn_'.$identifier.$course_id;
            $response['hide'] = '#add_to_cart_btn_'.$identifier.$course_id;
        }
        $this->session->set_userdata('cart_items', $previous_cart_items);


        //Cart page start
        $response['html'] = [
            'elem' => '#shoppingCart',
            'content' => $this->load->view('frontend/' . get_frontend_settings('theme') . '/shopping_cart_inner_view', [], true)
        ];
        //Cart page end


        //Cart header content start
        $cart_items = $this->session->userdata('cart_items');
        $response['load'] = [
            'elem' => '#cartItems',
            'content' => $this->load->view('frontend/'. get_frontend_settings('theme') .'/cart_items',[], true)
        ];
        $response['text'] = ['elem' => '#cartItemsCounter', 'content' => count($cart_items)];
        //Cart header content end


        echo json_encode($response);
    }
    public function handle_buy_now($course_id = "")
    {
        if (!$this->session->userdata('cart_items')) {
            $this->session->set_userdata('cart_items', array());
        }

        if(isset($_GET['gift'])){
            $is_gift = '?gift=yes';
        }else{
            $is_gift = '';
        }

        $previous_cart_items = $this->session->userdata('cart_items');
        if (in_array($course_id, $previous_cart_items)) {
            // $key = array_search($course_id, $previous_cart_items);
            // unset($previous_cart_items[$key]);
        } else {
            array_push($previous_cart_items, $course_id);
        }
        $this->session->set_userdata('cart_items', $previous_cart_items);

        if($this->session->userdata('user_login')){
            $this->payment_model->configure_course_payment();
            echo json_encode(['redirectTo' => site_url('home/shopping_cart'.$is_gift)]);
        }else{
            set_url_history(site_url('home/shopping_cart'.$is_gift));
            echo json_encode(['redirectTo' => site_url('login')]);
        }
    }

    public function handleCartItemForBuyNowButton()
    {
        if (!$this->session->userdata('cart_items')) {
            $this->session->set_userdata('cart_items', array());
        }

        $course_id = $this->input->post('course_id');
        $previous_cart_items = $this->session->userdata('cart_items');
        if (!in_array($course_id, $previous_cart_items)) {
            array_push($previous_cart_items, $course_id);
        }
        $this->session->set_userdata('cart_items', $previous_cart_items);
        $this->load->view('frontend/' . get_frontend_settings('theme') . '/cart_items');
    }

    public function refreshWishList()
    {
        $this->load->view('frontend/' . get_frontend_settings('theme') . '/wishlist_items');
    }

    public function apply_coupon()
    {
        $page_data['coupon_code'] = $this->input->post('coupon_code');
        
        $response['html'] = [
            'elem' => '#shoppingCart',
            'content' => $this->load->view('frontend/' . get_frontend_settings('theme') . '/shopping_cart_inner_view', $page_data, true)
        ];
        echo json_encode($response);
    }

    public function refreshShoppingCart()
    {
        $page_data['coupon_code'] = $this->input->post('couponCode');
        $this->load->view('frontend/' . get_frontend_settings('theme') . '/shopping_cart_inner_view', $page_data);
    }

    //this is only for elegant
    public function refreshShoppingCartItem()
    {
        $page_data['coupon_code'] = $this->input->post('couponCode');
        $this->load->view('frontend/' . get_frontend_settings('theme') . '/cart_items', $page_data);
    }

    public function isLoggedIn()
    {
        if ($this->session->userdata('user_login') == 1) {
            echo true;
        } else {
            if (isset($_GET['url_history']) && !empty($_GET['url_history'])) {
                $this->session->set_userdata('url_history', base64_decode($_GET['url_history']));
            }
            echo false;
        }
    }

    //choose payment gateway
    public function payment()
    {
        if ($this->session->userdata('user_login') != 1)
            redirect('login', 'refresh');

        $page_data['total_price_of_checking_out'] = $this->session->userdata('total_price_of_checking_out');
        $page_data['page_title'] = site_phrase("payment_gateway");
        $this->load->view('payment/index', $page_data);
    }

    // SHOW PAYPAL CHECKOUT PAGE
    public function paypal_checkout($payment_request = "only_for_mobile")
    {
        if ($this->session->userdata('user_login') != 1 && $payment_request != 'true')
            redirect('home', 'refresh');

        $page_data['payment_request'] = $payment_request;
        $page_data['user_details']    = $this->user_model->get_user($this->session->userdata('user_id'))->row_array();
        $page_data['amount_to_pay']   = $this->session->userdata('total_price_of_checking_out');
        $this->load->view('frontend/' . get_frontend_settings('theme') . '/paypal_checkout', $page_data);
    }

    // PAYPAL CHECKOUT ACTIONS
    public function paypal_payment($user_id = "", $amount_paid = "", $paymentID = "", $paymentToken = "", $payerID = "", $payment_request_mobile = "")
    {
        $paypal_keys = get_settings('paypal');
        $paypal = json_decode($paypal_keys);

        if ($paypal[0]->mode == 'sandbox') {
            $paypalClientID = $paypal[0]->sandbox_client_id;
            $paypalSecret   = $paypal[0]->sandbox_secret_key;
        } else {
            $paypalClientID = $paypal[0]->production_client_id;
            $paypalSecret   = $paypal[0]->production_secret_key;
        }

        //THIS IS HOW I CHECKED THE PAYPAL PAYMENT STATUS
        $status = $this->payment_model->paypal_payment($paymentID, $paymentToken, $payerID, $paypalClientID, $paypalSecret);
        if (!$status) {
            $this->session->set_flashdata('error_message', site_phrase('an_error_occurred_during_payment'));
            redirect('home/shopping_cart', 'refresh');
        }
        $this->crud_model->enrol_student($user_id);
        $this->crud_model->course_purchase($user_id, 'paypal', $amount_paid);
        $this->email_model->course_purchase_notification($user_id, 'paypal', $amount_paid);
        $this->session->set_flashdata('flash_message', site_phrase('payment_successfully_done'));
        if ($payment_request_mobile == 'true') :
            $course_id = $this->session->userdata('cart_items');
            redirect('home/payment_success_mobile/' . $course_id[0] . '/' . $user_id . '/paid', 'refresh');
        else :
            $this->session->set_userdata('cart_items', array());
            redirect('home/my_courses', 'refresh');
        endif;
    }

    // SHOW STRIPE CHECKOUT PAGE
    public function stripe_checkout($payment_request = "only_for_mobile")
    {
        if ($this->session->userdata('user_login') != 1 && $payment_request != 'true')
            redirect('home', 'refresh');

        //checking price
        $payment_info['payable_amount'] = $this->session->userdata('total_price_of_checking_out');
        $page_data['payment_request'] = $payment_request;
        $page_data['user_details']    = $this->user_model->get_user($this->session->userdata('user_id'))->row_array();
        $page_data['amount_to_pay']   = $payment_info['payable_amount'];
        $this->load->view('payment/stripe/stripe_checkout', $page_data);
    }

    // STRIPE CHECKOUT ACTIONS
    public function stripe_payment($user_id = "", $payment_request_mobile = "", $session_id = "")
    {
        //THIS IS HOW I CHECKED THE STRIPE PAYMENT STATUS
        $response = $this->payment_model->stripe_payment($user_id, $session_id);

        if ($response['payment_status'] === 'succeeded') {
            // STUDENT ENROLMENT OPERATIONS AFTER A SUCCESSFUL PAYMENT
            $check_duplicate = $this->crud_model->check_duplicate_payment_for_stripe($response['transaction_id'], $session_id);
            if ($check_duplicate == false) :
                $this->crud_model->enrol_student($user_id);
                $this->crud_model->course_purchase($user_id, 'stripe', $response['paid_amount'], $response['transaction_id'], $session_id);
                $this->email_model->course_purchase_notification($user_id, 'stripe', $response['paid_amount']);
            else :
                //duplicate payment
                $this->session->set_flashdata('error_message', site_phrase('session_time_out'));
                redirect('home/shopping_cart', 'refresh');
            endif;

            if ($payment_request_mobile == 'true') :
                $course_id = $this->session->userdata('cart_items');
                $this->session->set_flashdata('flash_message', site_phrase('payment_successfully_done'));
                redirect('home/payment_success_mobile/' . $course_id[0] . '/' . $user_id . '/paid', 'refresh');
            else :
                $this->session->set_userdata('cart_items', array());
                $this->session->set_flashdata('flash_message', site_phrase('payment_successfully_done'));
                redirect('home/my_courses', 'refresh');
            endif;
        } else {
            if ($payment_request_mobile == 'true') :
                $course_id = $this->session->userdata('cart_items');
                $this->session->set_flashdata('flash_message', $response['status_msg']);
                redirect('home/payment_success_mobile/' . $course_id[0] . '/' . $user_id . '/error', 'refresh');
            else :
                $this->session->set_flashdata('error_message', $response['status_msg']);
                redirect('home/shopping_cart', 'refresh');
            endif;
        }
    }


    public function razorpay_checkout($payment_request = "only_for_mobile")
    {
        if ($this->session->userdata('user_login') != 1 && $payment_request != 'true')
            redirect('home', 'refresh');


        $payment_info['payable_amount'] = $this->session->userdata('total_price_of_checking_out');
        $page_data['payment_request'] = $payment_request;
        $page_data['user_details']    = $this->user_model->get_user($this->session->userdata('user_id'))->row_array();
        $page_data['amount_to_pay']   = $payment_info['payable_amount'];
        $this->load->view('payment/razorpay/razorpay_checkout', $page_data);
    }

    // PAYPAL CHECKOUT ACTIONS
    public function razorpay_payment($payment_request_mobile = "")
    {

        $response = array();
        if (isset($_GET['user_id']) && !empty($_GET['user_id']) && isset($_GET['amount']) && !empty($_GET['amount'])) {

            $user_id            = $_GET['user_id'];
            $amount             = $_GET['amount'];
            $razorpay_order_id      = $_GET['razorpay_order_id'];
            $payment_id         = $_GET['payment_id'];
            $signature        = $_GET['signature'];

            //THIS IS HOW I CHECKED THE PAYPAL PAYMENT STATUS
            $status = $this->payment_model->razorpay_payment($razorpay_order_id, $payment_id, $amount, $signature);

            if ($status == 1) {
                $payment_key['payment_id'] = $payment_id;
                $payment_key['razorpay_order_id'] = $razorpay_order_id;
                $payment_key['signature'] = $signature;
                $payment_key = json_encode($payment_key);

                $this->crud_model->enrol_student($user_id);
                $this->crud_model->course_purchase($user_id, 'razorpay', $amount, $payment_key);
                $this->email_model->course_purchase_notification($user_id, 'razorpay', $amount);
                $this->session->set_flashdata('flash_message', site_phrase('payment_successfully_done'));
                if ($payment_request_mobile == 'true') :
                    $course_id = $this->session->userdata('cart_items');
                    redirect('home/payment_success_mobile/' . $course_id[0] . '/' . $user_id . '/paid', 'refresh');
                else :
                    $this->session->set_userdata('cart_items', array());
                    redirect('home/my_courses', 'refresh');
                endif;
            } else {
                if ($payment_request_mobile == 'true') :
                    $course_id = $this->session->userdata('cart_items');
                    $this->session->set_flashdata('flash_message', $response['status_msg']);
                    redirect('home/payment_success_mobile/' . $course_id[0] . '/' . $user_id . '/error', 'refresh');
                else :
                    $this->session->set_flashdata('error_message', site_phrase('payment_failed') . '! ' . site_phrase('something_is_wrong'));
                    redirect('home/shopping_cart', 'refresh');
                endif;
            }
        } else {
            if ($payment_request_mobile == 'true') :
                $course_id = $this->session->userdata('cart_items');
                $this->session->set_flashdata('flash_message', $response['status_msg']);
                redirect('home/payment_success_mobile/' . $course_id[0] . '/' . $user_id . '/error', 'refresh');
            else :
                $this->session->set_flashdata('error_message', site_phrase('payment_failed') . '! ' . site_phrase('something_is_wrong'));
                redirect('home/shopping_cart', 'refresh');
            endif;
        }
    }


    public function lesson($slug = "", $course_id = "", $lesson_id = "")
    {
        $enroll_status = enroll_status($course_id);

        $user_id = $this->session->userdata('user_id');
        $course_instructor_ids = array();
        if ($this->session->userdata('user_login') != 1) {
            if ($this->session->userdata('admin_login') != 1) {
                redirect('home', 'refresh');
            }
        }

        $course_details = $this->crud_model->get_course_by_id($course_id)->row_array();
        $course_instructor_ids = explode(',', $course_details['user_id']);

        if ($course_details['course_type'] == 'general') {
            
            //this function saved current lesson id and return previous lesson id if $lesson_id param is empty
            $lesson_id = $this->crud_model->update_last_played_lesson($course_id, $lesson_id);
            $sections = $this->crud_model->get_section('course', $course_id);
            if ($sections->num_rows() > 0) {
                $page_data['sections'] = $sections->result_array();
                if ($lesson_id == "") {
                    $default_section = $sections->row_array();
                    $page_data['section_id'] = $default_section['id'];
                    $lessons = $this->crud_model->get_lessons('section', $default_section['id']);
                    if ($lessons->num_rows() > 0) {
                        $default_lesson = $lessons->row_array();
                        $lesson_id = $default_lesson['id'];
                        $page_data['lesson_id']  = $default_lesson['id'];
                    }
                } else {
                    $page_data['lesson_id']  = $lesson_id;
                    $section_id = $this->db->get_where('lesson', array('id' => $lesson_id))->row()->section_id;
                    $page_data['section_id'] = $section_id;
                }
            } else {
                $page_data['sections'] = array();
            }
        } else if ($course_details['course_type'] == 'scorm') {
            $this->load->model('addons/scorm_model');
            $scorm_course_data = $this->scorm_model->get_scorm_curriculum_by_course_id($course_id);
            $page_data['scorm_curriculum'] = $scorm_course_data->row_array();
        }

        //if not admin or course owner
        if ($this->session->userdata('role_id') != 1 && !in_array($user_id, $course_instructor_ids)) {
            if($enroll_status == 'expired'){
                $this->session->set_flashdata('error_message', site_phrase('Your course accessibility has expired. You need to buy it again'));
                redirect(site_url('home/course/' . slugify($course_details['title']) . '/' . $course_details['id']), 'refresh');
            }elseif (!$enroll_status) {
                $this->session->set_flashdata('error_message', site_phrase('You have to buy the course first'));
                redirect(site_url('home/course/' . slugify($course_details['title']) . '/' . $course_details['id']), 'refresh');
            }
        }


        $page_data['lesson_details'] = $this->crud_model->get_lessons('lesson', $lesson_id)->row_array();
        $page_data['course_details']  = $course_details;
        $page_data['drip_content_settings']  = json_decode(get_settings('drip_content_settings'), true);
        $page_data['watch_history']  = $this->crud_model->get_watch_histories($user_id, $course_id)->row_array();
        $page_data['course_id']  = $course_id;
        $page_data['page_name']  = 'lessons';
        $page_data['page_title'] = $course_details['title'];
        $this->load->view('lessons/index', $page_data);
    }

    function pdf_canvas($course_id = "", $lesson_id = ""){
        $page_data['course_id'] = $course_id;
        $page_data['lesson_id'] = $lesson_id;
        $this->load->view('lessons/pdf_canvas', $page_data);
    }

    public function my_courses_by_category()
    {
        $category_id = $this->input->post('category_id');
        $course_details = $this->crud_model->get_my_courses_by_category_id($category_id)->result_array();
        $page_data['my_courses'] = $course_details;
        $this->load->view('frontend/' . get_frontend_settings('theme') . '/reload_my_courses', $page_data);
    }

    public function search($search_string = "")
    {


        if (isset($_GET['query']) && !empty($_GET['query'])) {
            $search_string = $_GET['query'];

            //check double quote and script text in the search string
            if(preg_match('/"/', $search_string) >= 1 && strpos($search_string,"script") >= 1){
                $this->session->set_flashdata('error_message', site_phrase('such_script_searches_are_not_allowed'));
                redirect(site_url(), 'refresh');
            }


            $all_rows = $this->crud_model->get_courses_by_search_string($search_string)->num_rows();
            $config = array();
            $config = pagintaion($all_rows, 9);
            $config['base_url']  = site_url('home/search/');
            $config['suffix']  = '?query=' . $search_string;
            $config['first_url']  = site_url('home/search').'?query=' . $search_string;
            $this->pagination->initialize($config);

            $page_data['courses'] = $this->crud_model->get_courses_by_search_string($search_string, $config['per_page'], $this->uri->segment(3))->result_array();
            $page_data['total_result'] = $all_rows;
        } else {
            $this->session->set_flashdata('error_message', site_phrase('no_search_value_found'));
            redirect(site_url(), 'refresh');
        }

        if (!$this->session->userdata('layout')) {
            $this->session->set_userdata('layout', 'list');
        }

        $page_data['layout']     = $this->session->userdata('layout');
        $page_data['page_name'] = 'courses_page';
        $page_data['search_string'] = $search_string;
        $page_data['page_title'] = site_phrase('search_results');
        $this->load->view('frontend/' . get_frontend_settings('theme') . '/index', $page_data);
    }
    public function my_courses_by_search_string()
    {
        $search_string = $this->input->post('search_string');
        $course_details = $this->crud_model->get_my_courses_by_search_string($search_string)->result_array();
        $page_data['my_courses'] = $course_details;
        $this->load->view('frontend/' . get_frontend_settings('theme') . '/reload_my_courses', $page_data);
    }

    public function get_my_wishlists_by_search_string()
    {
        $search_string = $this->input->post('search_string');
        $course_details = $this->crud_model->get_courses_of_wishlists_by_search_string($search_string);
        $page_data['my_courses'] = $course_details;
        $this->load->view('frontend/' . get_frontend_settings('theme') . '/reload_my_wishlists', $page_data);
    }

    public function reload_my_wishlists()
    {
        $my_courses = $this->crud_model->get_courses_by_wishlists();
        $page_data['my_courses'] = $my_courses;
        $this->load->view('frontend/' . get_frontend_settings('theme') . '/reload_my_wishlists', $page_data);
    }

    public function get_course_details()
    {
        $course_id = $this->input->post('course_id');
        $course_details = $this->crud_model->get_course_by_id($course_id)->row_array();
        echo $course_details['title'];
    }

    public function rate_course()
    {
        $course_id = $this->input->post('course_id');
        $starRating = $this->input->post('starRating');
        if(enroll_status($course_id)){
            $data['review'] = $this->input->post('review');
            $data['ratable_id'] = $this->input->post('course_id');
            $data['ratable_type'] = 'course';
            $data['rating'] = ($starRating > 0 && $starRating < 6) ? $starRating : 5;
            $data['date_added'] = strtotime(date('D, d-M-Y'));
            $data['user_id'] = $this->session->userdata('user_id');

            $this->crud_model->rate($data);

            $data['course_details'] = $this->crud_model->get_course_by_id($course_id)->row_array();
            $response['html'] = ['elem' => '#reviews .reviews', 'content' => $this->load->view('frontend/' . get_frontend_settings('theme') . '/course_page_reviews',$data, true)];
            $response['success'] = get_phrase('You have successfully rated the course');
        }else{
            $response['error'] = get_phrase('This course cannot be rated. Please buy the course first');
        }

        echo json_encode($response);
    }

    public function remove_rating($course_id, $rating_id){
        if(enroll_status($course_id) || $this->session->userdata('admin_login')){
            $this->db->where('id', $rating_id);
            $this->db->delete('rating');

            $response['fadeOut'] = '#userReview'.$rating_id;
            $response['success'] = get_phrase('Review deleted successfully');
            echo json_encode($response);
        }
    }

    public function about_us()
    {
        $page_data['page_name'] = 'about_us';
        $page_data['page_title'] = site_phrase('about_us');
        $this->load->view('frontend/' . get_frontend_settings('theme') . '/index', $page_data);
    }

    public function terms_and_condition()
    {
        $page_data['page_name'] = 'terms_and_condition';
        $page_data['page_title'] = site_phrase('terms_and_condition');
        $this->load->view('frontend/' . get_frontend_settings('theme') . '/index', $page_data);
    }

    public function refund_policy()
    {
        $page_data['page_name'] = 'refund_policy';
        $page_data['page_title'] = site_phrase('refund_policy');
        $this->load->view('frontend/' . get_frontend_settings('theme') . '/index', $page_data);
    }

    public function privacy_policy()
    {
        $page_data['page_name'] = 'privacy_policy';
        $page_data['page_title'] = site_phrase('privacy_policy');
        $this->load->view('frontend/' . get_frontend_settings('theme') . '/index', $page_data);
    }
    public function cookie_policy()
    {
        $page_data['page_name'] = 'cookie_policy';
        $page_data['page_title'] = site_phrase('cookie_policy');
        $this->load->view('frontend/' . get_frontend_settings('theme') . '/index', $page_data);
    }


    // Version 1.1
    public function dashboard($param1 = "")
    {
        if ($this->session->userdata('user_login') != 1) {
            redirect('home', 'refresh');
        }

        if ($param1 == "") {
            $page_data['type'] = 'active';
        } else {
            $page_data['type'] = $param1;
        }

        $page_data['page_name']  = 'instructor_dashboard';
        $page_data['page_title'] = site_phrase('instructor_dashboard');
        $page_data['user_id']    = $this->session->userdata('user_id');
        $this->load->view('frontend/' . get_frontend_settings('theme') . '/index', $page_data);
    }

    public function create_course()
    {
        if ($this->session->userdata('user_login') != 1) {
            redirect('home', 'refresh');
        }

        $page_data['page_name'] = 'create_course';
        $page_data['page_title'] = site_phrase('create_course');
        $this->load->view('frontend/' . get_frontend_settings('theme') . '/index', $page_data);
    }

    public function edit_course($param1 = "", $param2 = "")
    {
        if ($this->session->userdata('user_login') != 1) {
            redirect('home', 'refresh');
        }

        if ($param2 == "") {
            $page_data['type']   = 'edit_course';
        } else {
            $page_data['type']   = $param2;
        }
        $page_data['page_name']  = 'manage_course_details';
        $page_data['course_id']  = $param1;
        $page_data['page_title'] = site_phrase('edit_course');
        $this->load->view('frontend/' . get_frontend_settings('theme') . '/index', $page_data);
    }

    public function course_action($param1 = "", $param2 = "")
    {
        if ($this->session->userdata('user_login') != 1) {
            redirect('home', 'refresh');
        }

        if ($param1 == 'create') {
            if (isset($_POST['create_course'])) {
                $this->crud_model->add_course();
                redirect(site_url('home/create_course'), 'refresh');
            } else {
                $this->crud_model->add_course('save_to_draft');
                redirect(site_url('home/create_course'), 'refresh');
            }
        } elseif ($param1 == 'edit') {
            if (isset($_POST['publish'])) {
                $this->crud_model->update_course($param2, 'publish');
                redirect(site_url('home/dashboard'), 'refresh');
            } else {
                $this->crud_model->update_course($param2, 'save_to_draft');
                redirect(site_url('home/dashboard'), 'refresh');
            }
        }
    }



    public function sections($action = "", $course_id = "", $section_id = "")
    {
        if ($this->session->userdata('user_login') != 1) {
            redirect('home', 'refresh');
        }

        if ($action == "add") {
            $this->crud_model->add_section($course_id);
        } elseif ($action == "edit") {
            $this->crud_model->edit_section($section_id);
        } elseif ($action == "delete") {
            $this->crud_model->delete_section($course_id, $section_id);
            $this->session->set_flashdata('flash_message', site_phrase('section_deleted'));
            redirect(site_url("home/edit_course/$course_id/manage_section"), 'refresh');
        } elseif ($action == "serialize_section") {
            $container = array();
            $serialization = json_decode($this->input->post('updatedSerialization'));
            foreach ($serialization as $key) {
                array_push($container, $key->id);
            }
            $json = json_encode($container);
            $this->crud_model->serialize_section($course_id, $json);
        }
        $page_data['course_id'] = $course_id;
        $page_data['course_details'] = $this->crud_model->get_course_by_id($course_id)->row_array();
        return $this->load->view('frontend/' . get_frontend_settings('theme') . '/reload_section', $page_data);
    }

    public function manage_lessons($action = "", $course_id = "", $lesson_id = "")
    {
        if ($this->session->userdata('user_login') != 1) {
            redirect('home', 'refresh');
        }
        if ($action == 'add') {
            $this->crud_model->add_lesson();
            $this->session->set_flashdata('flash_message', site_phrase('lesson_added'));
        } elseif ($action == 'edit') {
            $this->crud_model->edit_lesson($lesson_id);
            $this->session->set_flashdata('flash_message', site_phrase('lesson_updated'));
        } elseif ($action == 'delete') {
            $this->crud_model->delete_lesson($lesson_id);
            $this->session->set_flashdata('flash_message', site_phrase('lesson_deleted'));
        }
        redirect('home/edit_course/' . $course_id . '/manage_lesson');
    }

    public function lesson_editing_form($lesson_id = "", $course_id = "")
    {
        if ($this->session->userdata('user_login') != 1) {
            redirect('home', 'refresh');
        }
        $page_data['type']      = 'manage_lesson';
        $page_data['course_id'] = $course_id;
        $page_data['lesson_id'] = $lesson_id;
        $page_data['page_name']  = 'lesson_edit';
        $page_data['page_title'] = site_phrase('update_lesson');
        $this->load->view('frontend/' . get_frontend_settings('theme') . '/index', $page_data);
    }

    public function download($filename = "")
    {
        $tmp           = explode('.', $filename);
        $fileExtension = strtolower(end($tmp));
        $yourFile = base_url() . 'uploads/lesson_files/' . $filename;
        $file = @fopen($yourFile, "rb");

        header('Content-Description: File Transfer');
        header('Content-Type: text/plain');
        header('Content-Disposition: attachment; filename=' . $filename);
        header('Expires: 0');
        header('Cache-Control: must-revalidate');
        header('Pragma: public');
        header('Content-Length: ' . filesize($yourFile));
        while (!feof($file)) {
            print(@fread($file, 1024 * 8));
            ob_flush();
            flush();
        }
    }

    // Version 1.3 codes
    public function get_enrolled_to_free_course($course_id)
    {
        $course_details = $this->crud_model->get_course_by_id($course_id)->row_array();

        if ($this->session->userdata('user_login') == 1) {
            $this->crud_model->enrol_to_free_course($course_id, $this->session->userdata('user_id'));
            redirect(site_url('home/course/'.slugify($course_details['title']).'/'.$course_id), 'refresh');
        } else {
            $url = site_url('home/course/'.slugify($this->crud_model->get_course_by_id($course_id)->row('title')).'/'.$course_id);
            set_url_history($url);
            redirect(site_url('login'), 'refresh');
        }
    }

    // Version 1.4 codes
    public function login()
    {
        //Check custom session data
        $this->user_model->check_session_data('login');

        $page_data['page_name'] = 'login';
        $page_data['page_title'] = site_phrase('login');
        $this->load->view('frontend/' . get_frontend_settings('theme') . '/index', $page_data);
    }

    public function sign_up()
    {
        if ($this->session->userdata('admin_login')) {
            redirect(site_url('admin'), 'refresh');
        } elseif ($this->session->userdata('user_login')) {
            redirect(site_url('user'), 'refresh');
        }
        $page_data['page_name'] = 'sign_up';
        $page_data['page_title'] = site_phrase('sign_up');
        $this->load->view('frontend/' . get_frontend_settings('theme') . '/index', $page_data);
    }

    public function forgot_password()
    {
        if ($this->session->userdata('admin_login')) {
            redirect(site_url('admin'), 'refresh');
        } elseif ($this->session->userdata('user_login')) {
            redirect(site_url('user'), 'refresh');
        }
        $page_data['page_name'] = 'forgot_password';
        $page_data['page_title'] = site_phrase('forgot_password');
        $this->load->view('frontend/' . get_frontend_settings('theme') . '/index', $page_data);
    }

    public function submit_quiz($from = "")
    {
        $submitted_quiz_info = array();
        $container = array();
        $course_id = $this->input->post('course_id');
        $quiz_id = $this->input->post('lesson_id');
        $quiz_questions = $this->crud_model->get_quiz_questions($quiz_id)->result_array();
        $total_correct_answers = 0;
        foreach ($quiz_questions as $quiz_question) {
            $submitted_answer_status = 0;
            $correct_answers = json_decode($quiz_question['correct_answers']);
            $submitted_answers = array();
            foreach ($this->input->post($quiz_question['id']) as $each_submission) {
                if (isset($each_submission)) {
                    array_push($submitted_answers, $each_submission);
                }
            }
            sort($correct_answers);
            sort($submitted_answers);
            if ($correct_answers == $submitted_answers) {
                $submitted_answer_status = 1;
                $total_correct_answers++;
            }
            $container = array(
                "question_id" => $quiz_question['id'],
                'submitted_answer_status' => $submitted_answer_status,
                "submitted_answers" => json_encode($submitted_answers),
                "correct_answers"  => json_encode($correct_answers),
            );
            array_push($submitted_quiz_info, $container);
        }

        $this->save_quiz_result($course_id, $quiz_id, $total_correct_answers);

        $page_data['submitted_quiz_info']   = $submitted_quiz_info;
        $page_data['total_correct_answers'] = $total_correct_answers;
        $page_data['total_questions'] = count($quiz_questions);
        $page_data['course_id']   = $course_id;
        $page_data['quiz_id']   = $quiz_id;
        if ($from == 'mobile') {
            $this->load->view('mobile/quiz_result', $page_data);
        } else {
            $this->load->view('lessons/quiz_result', $page_data);
        }
    }

    function save_quiz_result($course_id = "", $quiz_id = "", $obtained_marks = '')
    {
        $student_id = $this->session->userdata('user_id');
        $this->db->where('course_id', $course_id);
        $this->db->where('student_id', $student_id);
        $query = $this->db->get('watch_histories');
        if ($query->num_rows() > 0) {
            $quiz_result = array();
            $previous_result = json_decode($query->row('quiz_result'), 1);
            if (is_array($previous_result) && count($previous_result) > 0) {
                $quiz_result = $previous_result;
            }
            $quiz_result[$quiz_id] = $obtained_marks;


            $data['date_updated'] = time();
            $data['quiz_result'] = json_encode($quiz_result);

            $this->db->where('course_id', $course_id);
            $this->db->where('student_id', $student_id);
            $this->db->update('watch_histories', $data);
        } else {
            $data['course_id'] = $course_id;
            $data['student_id'] = $student_id;
            $data['watching_lesson_id'] = $quiz_id;
            $data['date_added'] = time();
            $data['quiz_result'] = json_encode(array($quiz_id => $obtained_marks));
            $this->db->insert('watch_histories', $data);
        }
    }

    private function access_denied_courses($course_id)
    {
        $course_details = $this->crud_model->get_course_by_id($course_id)->row_array();
        if ($course_details['status'] == 'draft' && $course_details['user_id'] != $this->session->userdata('user_id')) {
            $this->session->set_flashdata('error_message', site_phrase('you_do_not_have_permission_to_access_this_course'));
            redirect(site_url('home'), 'refresh');
        } elseif ($course_details['status'] == 'pending') {
            if ($course_details['user_id'] != $this->session->userdata('user_id') && $this->session->userdata('role_id') != 1) {
                $this->session->set_flashdata('error_message', site_phrase('you_do_not_have_permission_to_access_this_course'));
                redirect(site_url('home'), 'refresh');
            }
        }
    }

    public function invoice($purchase_history_id = '')
    {
        if ($this->session->userdata('user_login') != 1) {
            redirect('home', 'refresh');
        }
        $purchase_history = $this->crud_model->get_payment_details_by_id($purchase_history_id);
        if ($purchase_history['user_id'] != $this->session->userdata('user_id')) {
            redirect('home', 'refresh');
        }
        $page_data['payment_info'] = $purchase_history;
        $page_data['page_name'] = 'invoice';
        $page_data['page_title'] = 'invoice';
        $this->load->view('frontend/' . get_frontend_settings('theme') . '/index', $page_data);
    }

    /** COURSE COMPARE STARTS */
    public function compare()
    {
        $course_id_1 = (isset($_GET['course-id-1']) && !empty($_GET['course-id-1'])) ? $_GET['course-id-1'] : null;
        $course_id_2 = (isset($_GET['course-id-2']) && !empty($_GET['course-id-2'])) ? $_GET['course-id-2'] : null;
        $course_id_3 = (isset($_GET['course-id-3']) && !empty($_GET['course-id-3'])) ? $_GET['course-id-3'] : null;

        $page_data['page_name'] = 'compare';
        $page_data['page_title'] = site_phrase('course_compare');
        
        $this->db->where('status', 'active');
        $page_data['courses'] = $this->db->get('course')->result_array();
        $page_data['course_1_details'] = $course_id_1 ? $this->crud_model->get_course_by_id($course_id_1)->row_array() : array();
        $page_data['course_2_details'] = $course_id_2 ? $this->crud_model->get_course_by_id($course_id_2)->row_array() : array();
        $page_data['course_3_details'] = $course_id_3 ? $this->crud_model->get_course_by_id($course_id_3)->row_array() : array();
        $this->load->view('frontend/' . get_frontend_settings('theme') . '/index', $page_data);
    }
    /** COURSE COMPARE ENDS */

    public function page_not_found()
    {
        $page_data['page_name'] = '404';
        $page_data['page_title'] = site_phrase('404 not found');
        $this->load->view('frontend/' . get_frontend_settings('theme') . '/index', $page_data);
    }

    // AJAX CALL FUNCTION FOR CHECKING COURSE PROGRESS
    function check_course_progress($course_id)
    {
        echo course_progress($course_id);
    }


    // SETTING FRONTEND LANGUAGE
    public function site_language()
    {
        $selected_language = $this->input->post('language');
        $this->session->set_userdata('language', $selected_language);
        echo true;
    }

    // SETTING FRONTEND LANGUAGE
    public function switch_language($language = "column")
    {
        if($this->db->field_exists(strtolower($language), 'language')){
            $this->session->set_userdata('language', $language);
        }
        echo json_encode(['reload' => true]);
    }


    //FOR MOBILE
    public function course_purchase($auth_token = '', $course_id  = '')
    {
        $this->load->model('jwt_model');
        if (empty($auth_token) || $auth_token == "null") {
            $page_data['cart_item'] = $course_id;
            $page_data['user_id'] = '';
            $page_data['is_login_now'] = 0;
            $page_data['enroll_type'] = null;
            $page_data['page_name'] = 'shopping_cart';
            $this->load->view('mobile/index', $page_data);
        } else {

            $logged_in_user_details = json_decode($this->jwt_model->token_data_get($auth_token), true);

            if ($logged_in_user_details['user_id'] > 0) {

                $credential = array('id' => $logged_in_user_details['user_id'], 'status' => 1, 'role_id' => 2);
                $query = $this->db->get_where('users', $credential);
                if ($query->num_rows() > 0) {
                    $row = $query->row();
                    $page_data['cart_item'] = $course_id;
                    $page_data['user_id'] = $row->id;
                    $page_data['is_login_now'] = 1;
                    $page_data['enroll_type'] = null;
                    $page_data['page_name'] = 'shopping_cart';

                    $cart_item = array($course_id);
                    $this->session->set_userdata('custom_session_limit', (time() + 604800));
                    $this->session->set_userdata('cart_items', $cart_item);
                    $this->session->set_userdata('user_login', '1');
                    $this->session->set_userdata('user_id', $row->id);
                    $this->session->set_userdata('role_id', $row->role_id);
                    $this->session->set_userdata('role', get_user_role('user_role', $row->id));
                    $this->session->set_userdata('name', $row->first_name . ' ' . $row->last_name);
                    $this->load->view('mobile/index', $page_data);
                }
            }
        }
    }

    //FOR MOBILE
    public function get_enrolled_to_free_course_mobile($course_id = "", $user_id = "", $get_request = "")
    {
        if ($get_request == "true") {
            $this->crud_model->enrol_to_free_course_mobile($course_id, $user_id);
        }
    }

    //FOR MOBILE
    public function payment_success_mobile($course_id = "", $user_id = "", $enroll_type = "")
    {
        if ($course_id > 0 && $user_id > 0) :
            $page_data['cart_item'] = $course_id;
            $page_data['user_id'] = $user_id;
            $page_data['is_login_now'] = 1;
            $page_data['enroll_type'] = $enroll_type;
            $page_data['page_name'] = 'shopping_cart';

            $this->session->unset_userdata('user_id');
            $this->session->unset_userdata('role_id');
            $this->session->unset_userdata('role');
            $this->session->unset_userdata('name');
            $this->session->unset_userdata('user_login');
            $this->session->unset_userdata('cart_items');

            $this->load->view('mobile/index', $page_data);
        endif;
    }

    //FOR MOBILE
    public function payment_gateway_mobile($course_id = "", $user_id = "")
    {
        if ($course_id > 0 && $user_id > 0) :
            $page_data['page_name'] = 'payment_gateway';
            $this->load->view('mobile/index', $page_data);
        endif;
    }

    function go_course_playing_page($course_id = "")
    {
        $this->db->where('user_id', $this->session->userdata('user_id'));
        $this->db->where('course_id', $course_id);
        $row = $this->db->get('enrol');
        $course_instructor_ids = explode(',', $this->crud_model->get_course_by_id($course_id)->row('user_id'));
        if ($this->session->userdata('role_id') == 1 || in_array($this->session->userdata('user_id'), $course_instructor_ids) || $row->num_rows() > 0) {
            echo 1;
        } else {
            echo 0;
        }
    }

    function preview_free_lesson($lesson_id = "")
    {
        $page_data['lesson'] = $this->crud_model->get_free_lessons($lesson_id);
        $this->load->view('frontend/' . get_frontend_settings('theme') . '/preview_free_lesson', $page_data);
    }

    function course_preview($course_id = ""){
        $page_data['course_details'] = $this->crud_model->get_course_by_id($course_id)->row_array();
        $this->load->view('frontend/' . get_frontend_settings('theme') . '/course_page_preview_modal', $page_data);
    }

    function play_lesson($lesson_id = "", $is_preview = ""){
        $admin_login = $this->session->userdata('admin_login');
        $lesson = $this->crud_model->get_lessons('lesson', $lesson_id)->row_array();
        $course_details = $this->crud_model->get_course_by_id($lesson['course_id'])->row_array();
        $is_course_instructor = $this->crud_model->is_course_instructor($course_details['id'], $this->session->userdata('user_id'));
        if($is_preview){
            if($lesson['is_free'] == 1){
                $data['course_details'] = $course_details;
                $data['lesson_details'] = $lesson;
                $data['lesson_id'] = $lesson_id;
                $data['course_id'] = $course_details['id'];
                $this->load->view('lessons/general_course_content_body', $data);
            }else{
                $response['error'] = get_phrase('This lecture is available exclusively as of premium part. To gain access, please purchase the course');
                echo json_encode($response);
            }
        }elseif($admin_login || $is_course_instructor || enroll_status($course_details['id']) == 'valid'){
            $response['redirectTo'] = site_url('home/lesson/'.slugify($course_details['title']).'/'.$course_details['id'].'/'.$lesson['id']);
            echo json_encode($response);
        }elseif($lesson['is_free'] != 1){
            $response['error'] = get_phrase('This lecture is available exclusively as of premium part. To gain access, please purchase the course');
                echo json_encode($response);
        }
    }

    function closed_back_to_mobile_ber()
    {
        $this->session->unset_userdata('app_url');
        redirect($_SERVER['HTTP_REFERER'], 'refresh');
    }

    //Mark this lesson as completed automatically
    function update_watch_history_with_duration()
    {
        echo $this->crud_model->update_watch_history_with_duration();
    }

    // Mark this lesson as completed codes
    function update_watch_history_manually()
    {
        echo $this->crud_model->update_watch_history_manually();
    }

    function set_flashdata_for_js($index = "", $message = "")
    {
        $this->session->set_flashdata($index, get_phrase($message));
    }

    function view_answer_sheet($quiz_result_id = "")
    {
        $page_data['quiz_results'] = $this->db->get_where('quiz_results', array('quiz_result_id' => $quiz_result_id));
        $page_data['lesson_details'] = $this->crud_model->get_lessons('lesson', $page_data['quiz_results']->row('quiz_id'))->row_array();
        $page_data['quiz_questions'] = $this->db->get_where('question', array('quiz_id' => $page_data['quiz_results']->row('quiz_id')));

        $this->load->view('lessons/quiz_result', $page_data);
    }


    // This is the function for rendering quiz web view for mobile
    public function quiz_mobile_web_view($lesson_id = "")
    {
        $user_id = $this->session->userdata('user_id');
        $logged_in_user_details = $this->user_model->get_all_user($user_id)->row_array();
        $data['lesson_details'] = $this->crud_model->get_lessons('lesson', $lesson_id)->row_array();
        $course_details = $this->crud_model->get_course_by_id($data['lesson_details']['course_id'])->row_array();
        $is_purchased = $this->crud_model->check_course_enrolled($course_details['id'], $logged_in_user_details['id']);

        if($is_purchased > 0){
            $data['course_details'] = $course_details;
            $data['page_name'] = 'quiz_view';
            $this->load->view('mobile/index', $data);
        }else{
            echo api_phrase('buy_the_course');
        }
    }

    // This is the function for rendering quiz web view for mobile
    public function live_class_mobile_web_view($course_id = "", $user_id = "", $now_leave = "")
    {
        $this->load->model('addons/liveclass_model');
        $logged_in_user_details = $this->user_model->get_all_user($user_id)->row_array();
        $course_details = $this->crud_model->get_course_by_id($course_id)->row_array();
        $is_purchased = $this->crud_model->check_course_enrolled($course_details['id'], $logged_in_user_details['id']);

        if($is_purchased > 0 && $now_leave == ""){
            $page_data['instructor_details']  = $this->user_model->get_all_user($course_details['creator'])->row_array();
            $page_data['live_class_details']  = $this->liveclass_model->get_live_class_details($course_id);
            $page_data['logged_user_details'] = $this->user_model->get_all_user($this->session->userdata('user_id'))->row_array();
            $page_data['course_details'] = $course_details;
            $page_data['page_name'] = 'live_class';
            $this->load->view('mobile/index', $page_data);
        }elseif($now_leave != ""){
            echo '<h6>'.api_phrase('you_have_already_left_the_meeting').'</h6>';
        }else{
             echo '<h6>'.api_phrase('buy_the_course').'</h6>';
        }
    }

    function check_gift_user(){

        if(isset($_POST['gift_email']) && filter_var($_POST['gift_email'], FILTER_VALIDATE_EMAIL)){
            $gift_to_user = $this->db->get_where('users', ['email' => $_POST['gift_email']]);
            if($gift_to_user->num_rows() > 0){
                $content = '<span class="text-success text-12px">'.get_phrase('Name').': '.$gift_to_user->row('first_name').' '.$gift_to_user->row('last_name').'</span>';
            }else{
                $content = '<span class="text-danger text-12px">'.get_phrase('User not found').'</span>';
            }
        }else{
            $content = '<span class="text-danger text-12px">'.get_phrase('User not found').'</span>';
        }
        $response['html'] = [
            'elem' => '#check_gift_user_message',
            'content' => $content
        ];
        echo json_encode($response);
    }

    //send gift modified
    function course_payment(){
        if(count($this->session->userdata('cart_items')) == 0){
            $this->session->set_flashdata('error_message', site_phrase('there_are_no_courses_on_your_cart'));
            redirect(site_url('home/shopping_cart'), 'refresh');
        }

        if(!$this->session->userdata('user_login')){
            set_url_history(site_url('home/shopping_cart'));
            redirect(site_url('login'), 'refresh');
        }


        //Course gift
        if(isset($_POST['is_gift']) && $_POST['is_gift'] == 1){
          if(isset($_POST['gift_email']) && filter_var($_POST['gift_email'], FILTER_VALIDATE_EMAIL)){
            $gift_to_user = $this->db->get_where('users', ['email' => $_POST['gift_email']]);
            if($gift_to_user->num_rows() > 0){
                $this->session->set_userdata('gift_to_user_id', $gift_to_user->row('id'));
            }else{
                $this->session->set_userdata('gift_to_user_id', null);
                $this->session->set_flashdata('error_message', site_phrase('Recepient must be an existing user'));
                redirect(site_url('home/shopping_cart'), 'refresh');
            }
          }else{
            $this->session->set_userdata('gift_to_user_id', null);
            $this->session->set_flashdata('error_message', site_phrase('Invalid email address'));
            redirect(site_url('home/shopping_cart'), 'refresh');
          }
        }else{
            $this->session->set_userdata('gift_to_user_id', null);
        }
        //End course gift
        $this->payment_model->configure_course_payment();
        redirect(site_url('payment'));
    }

    function gift_to_user_id(){
        $this->session->unset_userdata('send_gift_to_id');
        $status = 0;
        $email = $this->input->post('email');
        $is_user = $this->user_model->get_user_by_email($email)->num_rows();
        if($is_user > 0){
            $status = 1;
            if(!empty($this->session->userdata('cart_items'))){                
                $user_id = $this->user_model->get_user_by_email($email)->row('id');
                $this->session->set_userdata('send_gift_to_id', $user_id);
            }                
        }
        echo $status;
    }


    function subscribe_to_our_newsletter(){
        $data['email'] = $this->input->post('email');

        if(filter_var($data['email'], FILTER_VALIDATE_EMAIL)){
            if($this->db->get_where('newsletter_subscriber',$data)->num_rows() > 0){
                $this->db->where('email', $data['email']);
                $this->db->update('newsletter_subscriber', ['updated_at' => time()]);
            }else{
                $data['created_at'] = time();
                $this->db->insert('newsletter_subscriber', $data);
            }
            $response['success'] = get_phrase('Thanks for subscribing to our newsletter');
        }else{
            $response['error'] = get_phrase('Invalid email address');
        }
        echo json_encode($response);
    }

    function get_compare_course_select2($course_1 = "0", $course_2 = "0", $course_3 = "0"){
        //Select 2 server-side course data
        $response = array();
        $result = $this->db->select('course.id id, course.title title, users.first_name first_name, users.last_name last_name')
            ->where('course.id !=', $course_1)
            ->where('course.id !=', $course_2)
            ->where('course.id !=', $course_3)
            ->where('course.status', 'active')
            ->group_start()
                ->like('course.title', $_GET['searchVal'])
                ->or_like('short_description', $_GET['searchVal'])
                ->or_like('first_name', $_GET['searchVal'])
                ->or_like('last_name', $_GET['searchVal'])
            ->group_end()
            ->limit(100)
            ->from('course')
            ->join('users', 'users.id = course.creator')
            ->get()->result_array();
        foreach($result as $key => $row){
            $response[] = ['id' => $row['id'], 'text' => $row['title'].' ('.get_phrase('Creator').': '.$row['first_name'].' '.$row['last_name'].')'];
        }
        echo json_encode($response);
    }

    function faq(){
        $page_data['page_name'] = 'website_faq';
        $page_data['page_title'] = strtoupper(get_phrase('FAQ'));
        $this->load->view('frontend/' . get_frontend_settings('theme') . '/index', $page_data);
    }

    function contact_us(){
        $page_data['page_name'] = 'contact_us';
        $page_data['page_title'] = get_phrase('Contact us');
        $this->load->view('frontend/' . get_frontend_settings('theme') . '/index', $page_data);
    }

    // function get_remote_video_duration(){
    //     $video_url = 'https://www.w3schools.com/tags/movie.mp4';//$this->input->post('video_url');
    //     $duration_as_seconds = $this->video_model->get_remote_video_duration($video_url);
    //     echo seconds_to_time_format($duration_as_seconds);
    // }

    function dark_and_light_mode(){
        if($this->session->userdata('theme_mode') != 'dark-theme'){
            $this->session->set_userdata('theme_mode', 'dark-theme');
            echo json_encode(['toggleClass' => ['elem' => 'body', 'content' => 'dark-theme']]);
        }else{
            $this->session->unset_userdata('theme_mode');
            echo json_encode(['toggleClass' => ['elem' => 'body', 'content' => 'dark-theme']]);
        }
    }

    function coupon_offer_100_percent(){
        $cart_items = $this->session->userdata('cart_items');
        $enrol_user_id = $this->session->userdata('user_id');
        $coupon_code = $this->session->userdata('applied_coupon');
        $coupon_details = $this->crud_model->get_coupon_details_by_code($coupon_code)->row_array();

        if(count($cart_items) > 0 && $coupon_code && $coupon_details['discount_percentage'] == 100 && $coupon_details['expiry_date'] >= time() && $enrol_user_id > 0 && $this->session->userdata('user_login')){

            $this->crud_model->enrol_student($enrol_user_id);

            $this->session->unset_userdata('gift_to_user_id');
            $this->session->set_userdata('cart_items', array());
            $this->session->set_userdata('payment_details', '');
            $this->session->set_userdata('applied_coupon', '');

            $this->session->set_flashdata('flash_message', site_phrase('You have successfully enrolled by applying a 100 percent coupon offer'));
            redirect('home/my_courses', 'refresh');
        }else{
            $this->session->set_flashdata('error_message', site_phrase('an_error_occurred_during_apply_coupn'));
            redirect('home/shopping_cart', 'refresh');
        }
    }


    //Start Notification
    function get_my_notification($type = ""){
        $user_id = $this->session->userdata('user_id');

        if($type == 'mark_all_as_read'){
            $this->db->where('to_user', $user_id);
            $this->db->update('notifications', ['status' => 1]);
        }

        if($type == 'remove_all'){
            $this->db->where('to_user', $user_id);
            $this->db->delete('notifications');
        }


        $this->db->where('to_user', $user_id);
        $this->db->limit(50);
        $query = $this->db->order_by('status ASC, id desc');
        $page_data['notifications'] = $query->get('notifications');

        $response['html'] = [
            'elem' => '#headerNotification',
            'content' => $this->load->view('frontend/'.get_frontend_settings('theme').'/notifications', [], true)
        ];

        echo json_encode($response);

    }
    //End notification


    function course_playing_page_layout(){
        if($this->session->userdata('full_page_layout') == false){
            $this->session->set_userdata('full_page_layout', true);
        }else{
            $this->session->set_userdata('full_page_layout', false);
        }

        echo json_encode(['reload' => true]);
    }

    function become_an_instructor(){
        $applications = $this->user_model->get_applications($this->session->userdata('user_id'), 'user');
        if ($applications->num_rows() > 0):
            redirect('user/become_an_instructor', 'refresh');
        endif;

        if ($this->session->userdata('user_login') != 1) {
            $url = site_url('home/course/'.slugify($this->crud_model->get_course_by_id($course_id)->row('title')).'/'.$course_id);
            set_url_history($url);
            $response['redirectTo'] = site_url('login');
        }else{

            if(isset($_POST) && count($_POST) > 0):
                $accepted_ext = array('doc', 'docs', 'pdf', 'txt', 'png', 'jpg', 'jpeg');
                $path = $_FILES['document']['name'];
                $ext = pathinfo($path, PATHINFO_EXTENSION);
                if (in_array(strtolower($ext), $accepted_ext)) {
                    $document_custom_name = random(15) . '.' . $ext;
                    $data['document'] = $document_custom_name;
                    move_uploaded_file($_FILES['document']['tmp_name'], 'uploads/document/' . $document_custom_name);
                } else {
                    $response['error'] = get_phrase('invalide_file');
                }

                $this->user_model->post_instructor_application($this->session->userdata('user_id'));
                $response['redirectTo'] = site_url('user/become_an_instructor');
            else:
                $page_data['page_name'] = 'become_a_instructor';
                $page_data['page_title'] = get_phrase('Become a instructor');
                $this->load->view('frontend/' . get_frontend_settings('theme') . '/index', $page_data);
                return;
            endif;
        }

        echo json_encode($response);
    }





}
