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

class Admin extends CI_Controller {
  public function __construct()
  {
    parent::__construct();

    $this->load->database();
    $this->load->library('session');
    /*cache control*/
    $this->output->set_header('Cache-Control: no-store, no-cache, must-revalidate, post-check=0, pre-check=0');
    $this->output->set_header('Pragma: no-cache');
    if (!$this->session->userdata('cart_items')) {
      $this->session->set_userdata('cart_items', array());
    }
  }

  public function index() {
    if ($this->session->userdata('admin_login') == true) {
      $this->dashboard();
    }else {
      redirect(site_url('login'), 'refresh');
    }
  }
  public function dashboard() {
    if ($this->session->userdata('admin_login') != true) {
      redirect(site_url('login'), 'refresh');
    }
    $page_data['page_name'] = 'dashboard';
    $page_data['page_title'] = get_phrase('dashboard');
    $this->load->view('backend/index.php', $page_data);
  }

  public function blank_template() {
    if ($this->session->userdata('admin_login') != true) {
      redirect(site_url('login'), 'refresh');
    }
    $page_data['page_name'] = 'blank_template';
    $this->load->view('backend/index.php', $page_data);
  }

  public function categories($param1 = "", $param2 = "") {
    if ($this->session->userdata('admin_login') != true) {
      redirect(site_url('login'), 'refresh');
    }

    if ($param1 == 'add') {
      $this->crud_model->add_category();
      $this->session->set_flashdata('flash_message', get_phrase('data_added_successfully'));
      redirect(site_url('admin/categories'), 'refresh');
    }
    elseif ($param1 == "edit") {
      $this->crud_model->edit_category($param2);
      $this->session->set_flashdata('flash_message', get_phrase('data_updated_successfully'));
      redirect(site_url('admin/categories'), 'refresh');
    }
    elseif ($param1 == "delete") {
      $this->crud_model->delete_category($param2);
      $this->session->set_flashdata('flash_message', get_phrase('data_deleted'));
      redirect(site_url('admin/categories'), 'refresh');
    }
    $page_data['page_name'] = 'categories';
    $page_data['page_title'] = get_phrase('categories');
    $page_data['categories'] = $this->crud_model->get_categories($param2);
    $this->load->view('backend/index', $page_data);
  }

  public function category_form($param1 = "", $param2 = "") {
    if ($this->session->userdata('admin_login') != true) {
      redirect(site_url('login'), 'refresh');
    }
    if ($param1 == "add_category") {
      $page_data['page_name'] = 'category_add';
      $page_data['categories'] = $this->crud_model->get_categories()->result_array();
      $page_data['page_title'] = get_phrase('add_category');
    }
    if ($param1 == "edit_category") {
      $page_data['page_name'] = 'category_edit';
      $page_data['page_title'] = get_phrase('edit_category');
      $page_data['categories'] = $this->crud_model->get_categories()->result_array();
      $page_data['category_id'] = $param2;
    }

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

  public function sub_categories_by_category_id($category_id = 0) {
    if ($this->session->userdata('admin_login') != true) {
      redirect(site_url('login'), 'refresh');
    }

    $category_id = $this->input->post('category_id');
    redirect(site_url("admin/sub_categories/$category_id"), 'refresh');
  }

  public function sub_category_form($param1 = "", $param2 = "") {
    if ($this->session->userdata('admin_login') != true) {
      redirect(site_url('login'), 'refresh');
    }

    if ($param1 == 'add_sub_category') {
      $page_data['page_name'] = 'sub_category_add';
      $page_data['page_title'] = get_phrase('add_sub_category');
    }
    elseif ($param1 == 'edit_sub_category') {
      $page_data['page_name'] = 'sub_category_edit';
      $page_data['page_title'] = get_phrase('edit_sub_category');
      $page_data['sub_category_id'] = $param2;
    }
    $page_data['categories'] = $this->crud_model->get_categories();
    $this->load->view('backend/index', $page_data);
  }

  public function instructors($param1 = "", $param2 = "") {
    if ($this->session->userdata('admin_login') != true) {
      redirect(site_url('login'), 'refresh');
    }
    elseif ($param1 == "edit") {
      $this->user_model->edit_user($param2);
      redirect(site_url('admin/instructors'), 'refresh');
    }
    elseif ($param1 == "delete") {
      $this->user_model->delete_user($param2);
      redirect(site_url('admin/instructors'), 'refresh');
    }

    $page_data['page_name'] = 'instructors';
    $page_data['page_title'] = get_phrase('instructor');
    $page_data['instructors'] = $this->user_model->get_instructor($param2);
    $this->load->view('backend/index', $page_data);
  }

  public function instructor_form($param1 = "", $param2 = "") {
    if ($this->session->userdata('admin_login') != true) {
      redirect(site_url('login'), 'refresh');
    }
    elseif ($param1 == 'edit_instructor_form') {
      $page_data['page_name'] = 'instructor_edit';
      $page_data['user_id'] = $param2;
      $page_data['page_title'] = get_phrase('instructor_edit');
      $this->load->view('backend/index', $page_data);
    }
  }

  public function users($param1 = "", $param2 = "") {
    if ($this->session->userdata('admin_login') != true) {
      redirect(site_url('login'), 'refresh');
    }
    if ($param1 == "add") {
      $this->user_model->add_user();
      redirect(site_url('admin/users'), 'refresh');
    }
    elseif ($param1 == "edit") {
      $this->user_model->edit_user($param2);
      redirect(site_url('admin/users'), 'refresh');
    }
    elseif ($param1 == "delete") {
      $this->user_model->delete_user($param2);
      redirect(site_url('admin/users'), 'refresh');
    }

    $page_data['page_name'] = 'users';
    $page_data['page_title'] = get_phrase('student');
    $page_data['users'] = $this->user_model->get_user($param2);
    $this->load->view('backend/index', $page_data);
  }

  public function user_form($param1 = "", $param2 = "") {
    if ($this->session->userdata('admin_login') != true) {
      redirect(site_url('login'), 'refresh');
    }

    if ($param1 == 'add_user_form') {
      $page_data['page_name'] = 'user_add';
      $page_data['page_title'] = get_phrase('student_add');
      $this->load->view('backend/index', $page_data);
    }
    elseif ($param1 == 'edit_user_form') {
      $page_data['page_name'] = 'user_edit';
      $page_data['user_id'] = $param2;
      $page_data['page_title'] = get_phrase('student_edit');
      $this->load->view('backend/index', $page_data);
    }
  }

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

    if ($param1 != "") {
      $date_range                   = $this->input->get('date_range');
      $date_range                   = explode(" - ", $date_range);
      $page_data['timestamp_start'] = strtotime($date_range[0]);
      $page_data['timestamp_end']   = strtotime($date_range[1]);
    }else {
      $first_day_of_month = "1 ".date("M")." ".date("Y").' 00:00:00';
      $last_day_of_month = date("t")." ".date("M")." ".date("Y").' 23:59:59';
      $page_data['timestamp_start']   = strtotime($first_day_of_month);
      $page_data['timestamp_end']     = strtotime($last_day_of_month);
    }
    $page_data['page_name'] = 'enrol_history';
    $page_data['enrol_history'] = $this->crud_model->enrol_history_by_date_range($page_data['timestamp_start'], $page_data['timestamp_end']);
    $page_data['page_title'] = get_phrase('enrol_history');
    $this->load->view('backend/index', $page_data);
  }

  public function enrol_student($param1 = "") {
    if ($this->session->userdata('admin_login') != true) {
      redirect(site_url('login'), 'refresh');
    }
    if ($param1 == 'enrol') {
      $this->crud_model->enrol_a_student_manually();
      redirect(site_url('admin/enrol_history'), 'refresh');
    }
    $page_data['page_name'] = 'enrol_student';
    $page_data['page_title'] = get_phrase('enrol_a_student');
    $this->load->view('backend/index', $page_data);
  }
  public function admin_revenue($param1 = "") {
    if ($this->session->userdata('admin_login') != true) {
      redirect(site_url('login'), 'refresh');
    }

    if ($param1 != "") {
      $date_range                   = $this->input->get('date_range');
      $date_range                   = explode(" - ", $date_range);
      $page_data['timestamp_start'] = strtotime($date_range[0]);
      $page_data['timestamp_end']   = strtotime($date_range[1]);
    }else {
      $page_data['timestamp_start'] = strtotime('-29 days', time());
      $page_data['timestamp_end']   = strtotime(date("m/d/Y"));
    }

    $page_data['page_name'] = 'admin_revenue';
    $page_data['payment_history'] = $this->crud_model->get_revenue_by_user_type($page_data['timestamp_start'], $page_data['timestamp_end'], 'admin_revenue');
    $page_data['page_title'] = get_phrase('admin_revenue');
    $this->load->view('backend/index', $page_data);
  }

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

    $page_data['page_name'] = 'instructor_revenue';
    $page_data['payment_history'] = $this->crud_model->get_revenue_by_user_type("", "", 'instructor_revenue');
    $page_data['page_title'] = get_phrase('instructor_revenue');
    $this->load->view('backend/index', $page_data);
  }

  function invoice($payment_id = "") {
    if ($this->session->userdata('admin_login') != true) {
      redirect(site_url('login'), 'refresh');
    }
    $page_data['page_name'] = 'invoice';
    $page_data['payment_details'] = $this->crud_model->get_payment_details_by_id($payment_id);
    $page_data['page_title'] = get_phrase('invoice');
    $this->load->view('backend/index', $page_data);
  }

  public function payment_history_delete($param1 = "", $redirect_to = "") {
    if ($this->session->userdata('admin_login') != true) {
      redirect(site_url('login'), 'refresh');
    }
    $this->crud_model->delete_payment_history($param1);
    $this->session->set_flashdata('flash_message', get_phrase('data_deleted_successfully'));
    redirect(site_url('admin/'.$redirect_to), 'refresh');
  }

  public function enrol_history_delete($param1 = "") {
    if ($this->session->userdata('admin_login') != true) {
      redirect(site_url('login'), 'refresh');
    }
    $this->crud_model->delete_enrol_history($param1);
    $this->session->set_flashdata('flash_message', get_phrase('data_deleted_successfully'));
    redirect(site_url('admin/enrol_history'), 'refresh');
  }

  public function purchase_history() {
    if ($this->session->userdata('admin_login') != true) {
      redirect(site_url('login'), 'refresh');
    }
    $page_data['page_name'] = 'purchase_history';
    $page_data['purchase_history'] = $this->crud_model->purchase_history();
    $page_data['page_title'] = get_phrase('purchase_history');
    $this->load->view('backend/index', $page_data);
  }

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

    if ($param1 == 'system_update') {
      $this->crud_model->update_system_settings();
      $this->session->set_flashdata('flash_message', get_phrase('system_settings_updated'));
      redirect(site_url('admin/system_settings'), 'refresh');
    }

    if ($param1 == 'logo_upload') {
      move_uploaded_file($_FILES['logo']['tmp_name'], 'assets/backend/logo.png');
      $this->session->set_flashdata('flash_message', get_phrase('backend_logo_updated'));
      redirect(site_url('admin/system_settings'), 'refresh');
    }

    if ($param1 == 'favicon_upload') {
      move_uploaded_file($_FILES['favicon']['tmp_name'], 'assets/favicon.png');
      $this->session->set_flashdata('flash_message', get_phrase('favicon_updated'));
      redirect(site_url('admin/system_settings'), 'refresh');
    }

    $page_data['languages']	 = $this->crud_model->get_all_languages();
    $page_data['page_name'] = 'system_settings';
    $page_data['page_title'] = get_phrase('system_settings');
    $this->load->view('backend/index', $page_data);
  }

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

    if ($param1 == 'frontend_update') {
      $this->crud_model->update_frontend_settings();
      $this->session->set_flashdata('flash_message', get_phrase('frontend_settings_updated'));
      redirect(site_url('admin/frontend_settings'), 'refresh');
    }

    if ($param1 == 'banner_image_update') {
      $this->crud_model->update_frontend_banner();
      $this->session->set_flashdata('flash_message', get_phrase('banner_image_update'));
      redirect(site_url('admin/frontend_settings'), 'refresh');
    }
    if ($param1 == 'light_logo') {
      $this->crud_model->update_light_logo();
      $this->session->set_flashdata('flash_message', get_phrase('logo_updated'));
      redirect(site_url('admin/frontend_settings'), 'refresh');
    }
    if ($param1 == 'dark_logo') {
      $this->crud_model->update_dark_logo();
      $this->session->set_flashdata('flash_message', get_phrase('logo_updated'));
      redirect(site_url('admin/frontend_settings'), 'refresh');
    }
    if ($param1 == 'small_logo') {
      $this->crud_model->update_small_logo();
      $this->session->set_flashdata('flash_message', get_phrase('logo_updated'));
      redirect(site_url('admin/frontend_settings'), 'refresh');
    }
    if ($param1 == 'favicon') {
      $this->crud_model->update_favicon();
      $this->session->set_flashdata('flash_message', get_phrase('favicon_updated'));
      redirect(site_url('admin/frontend_settings'), 'refresh');
    }

    $page_data['page_name'] = 'frontend_settings';
    $page_data['page_title'] = get_phrase('frontend_settings');
    $this->load->view('backend/index', $page_data);
  }
  public function payment_settings($param1 = "") {
    if ($this->session->userdata('admin_login') != true) {
      redirect(site_url('login'), 'refresh');
    }

    if ($param1 == 'system_currency') {
      $this->crud_model->update_system_currency();
      redirect(site_url('admin/payment_settings'), 'refresh');
    }
    if ($param1 == 'paypal_settings') {
      $this->crud_model->update_paypal_settings();
      redirect(site_url('admin/payment_settings'), 'refresh');
    }
    if ($param1 == 'stripe_settings') {
      $this->crud_model->update_stripe_settings();
      redirect(site_url('admin/payment_settings'), 'refresh');
    }

    $page_data['page_name'] = 'payment_settings';
    $page_data['page_title'] = get_phrase('payment_settings');
    $this->load->view('backend/index', $page_data);
  }

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

    if ($param1 == 'update') {
      $this->crud_model->update_smtp_settings();
      $this->session->set_flashdata('flash_message', get_phrase('smtp_settings_updated_successfully'));
      redirect(site_url('admin/smtp_settings'), 'refresh');
    }

    $page_data['page_name'] = 'smtp_settings';
    $page_data['page_title'] = get_phrase('smtp_settings');
    $this->load->view('backend/index', $page_data);
  }

  public function instructor_settings($param1 = "") {
    if ($this->session->userdata('admin_login') != true) {
      redirect(site_url('login'), 'refresh');
    }
    if ($param1 == 'update') {
      $this->crud_model->update_instructor_settings();
      $this->session->set_flashdata('flash_message', get_phrase('instructor_settings_updated'));
      redirect(site_url('admin/instructor_settings'), 'refresh');
    }

    $page_data['page_name'] = 'instructor_settings';
    $page_data['page_title'] = get_phrase('instructor_settings');
    $this->load->view('backend/index', $page_data);
  }

  public function theme_settings($action = '') {
    if ($this->session->userdata('admin_login') != true) {
      redirect(site_url('login'), 'refresh');
    }
    $page_data['page_name']  = 'theme_settings';
    $page_data['page_title'] = get_phrase('theme_settings');
    $this->load->view('backend/index', $page_data);
  }

  public function theme_actions($action = "", $theme = "") {
    if ($action == 'activate') {
      $theme_to_active  = $this->input->post('theme');
      $installed_themes = $this->crud_model->get_installed_themes();
      if (in_array($theme_to_active, $installed_themes)) {
        $this->crud_model->activate_theme($theme_to_active);
        echo true;
      }else {
        echo false;
      }
    }
    elseif ($action == 'remove') {
      if ($theme == get_frontend_settings('theme')) {
        $this->session->set_flashdata('error_message', get_phrase('activate_a_theme_first'));
      }else{
        $this->crud_model->remove_files_and_folders(APPPATH.'/views/frontend/'.$theme);
        $this->crud_model->remove_files_and_folders(FCPATH.'/assets/frontend/'.$theme);
        $this->session->set_flashdata('flash_message', $theme.' '.get_phrase('theme_removed_successfully'));
      }
      redirect(site_url('admin/theme_settings'), 'refresh');
    }

  }

  public function courses() {
    if ($this->session->userdata('admin_login') != true) {
      redirect(site_url('login'), 'refresh');
    }


    $page_data['selected_category_id']   = isset($_GET['category_id']) ? $_GET['category_id'] : "all";
    $page_data['selected_instructor_id'] = isset($_GET['instructor_id']) ? $_GET['instructor_id'] : "all";
    $page_data['selected_price']         = isset($_GET['price']) ? $_GET['price'] : "all";
    $page_data['selected_status']        = isset($_GET['status']) ? $_GET['status'] : "all";

    // Courses query is used for deciding if there is any course or not. Check the view you will get it
    $page_data['courses']                = $this->crud_model->filter_course_for_backend($page_data['selected_category_id'], $page_data['selected_instructor_id'], $page_data['selected_price'], $page_data['selected_status']);
    $page_data['status_wise_courses']    = $this->crud_model->get_status_wise_courses();
    $page_data['instructors']            = $this->user_model->get_instructor();
    $page_data['page_name']              = 'courses-server-side';
    $page_data['categories']             = $this->crud_model->get_categories();
    $page_data['page_title']             = get_phrase('active_courses');
    $this->load->view('backend/index', $page_data);
  }

  // This function is responsible for loading the course data from server side for datatable SILENTLY
  public function get_courses() {
    if ($this->session->userdata('admin_login') != true) {
      redirect(site_url('login'), 'refresh');
    }
    $courses = array();
    // Filter portion
    $filter_data['selected_category_id']   = $this->input->post('selected_category_id');
    $filter_data['selected_instructor_id'] = $this->input->post('selected_instructor_id');
    $filter_data['selected_price']         = $this->input->post('selected_price');
    $filter_data['selected_status']        = $this->input->post('selected_status');

    // Server side processing portion
    $columns = array(
      0 => '#',
      1 => 'title',
      2 => 'category',
      3 => 'lesson_and_section',
      4 => 'enrolled_student',
      5 => 'status',
      6 => 'price',
      7 => 'actions',
      8 => 'course_id'
    );

    // Coming from databale itself. Limit is the visible number of data
    $limit = html_escape($this->input->post('length'));
    $start = html_escape($this->input->post('start'));
    $order = "";
    $dir   = $this->input->post('order')[0]['dir'];

    $totalData = $this->lazyload->count_all_courses($filter_data);
    $totalFiltered = $totalData;

    // This block of code is handling the search event of datatable
    if(empty($this->input->post('search')['value'])) {
      $courses = $this->lazyload->courses($limit, $start, $order, $dir, $filter_data);
    }
    else {
      $search = $this->input->post('search')['value'];
      $courses =  $this->lazyload->course_search($limit, $start, $search, $order, $dir, $filter_data);
      $totalFiltered = $this->lazyload->course_search_count($search);
    }

    // Fetch the data and make it as JSON format and return it.
    $data = array();
    if(!empty($courses)) {
      foreach ($courses as $key => $row) {
        $instructor_details = $this->user_model->get_all_user($row->user_id)->row_array();
        $category_details = $this->crud_model->get_category_details_by_id($row->sub_category_id)->row_array();
        $sections = $this->crud_model->get_section('course', $row->id);
        $lessons = $this->crud_model->get_lessons('course', $row->id);
        $enroll_history = $this->crud_model->enrol_history($row->id);

        $status_badge = "badge-success-lighten";
        if ($row->status == 'pending') {
          $status_badge = "badge-danger-lighten";
        }elseif ($row->status == 'draft') {
          $status_badge = "badge-dark-lighten";
        }

        $price_badge = "badge-dark-lighten";
        $price = 0;
        if ($row->is_free_course == null){
          if ($row->discount_flag == 1) {
            $price = currency($row->discounted_price);
          }else{
            $price = currency($row->price);
          }
        }elseif ($row->is_free_course == 1){
          $price_badge = "badge-success-lighten";
          $price = get_phrase('free');
        }

        $view_course_on_frontend_url = site_url('home/course/'.slugify($row->title).'/'.$row->id);
        $edit_this_course_url = site_url('admin/course_form/course_edit/'.$row->id);
        $section_and_lesson_url = site_url('admin/course_form/course_edit/'.$row->id);

        if ($row->status == 'active') {
          $course_status_changing_message = get_phrase('mark_as_pending');
          if ($row->user_id != $this->session->userdata('user_id')) {
            $course_status_changing_action = "showAjaxModal('".site_url('modal/popup/mail_on_course_status_changing_modal/pending/'.$row->id.'/'.$filter_data['selected_category_id'].'/'.$filter_data['selected_instructor_id'].'/'.$filter_data['selected_price'].'/'.$filter_data['selected_status'])."', '".$course_status_changing_message."')";
          }else{
            $course_status_changing_action = "confirm_modal('".site_url('admin/change_course_status_for_admin/pending/'.$row->id.'/'.$filter_data['selected_category_id'].'/'.$filter_data['selected_instructor_id'].'/'.$filter_data['selected_price'].'/'.$filter_data['selected_status'])."')";
          }
        }else{
          $course_status_changing_message = get_phrase('mark_as_active');
          if ($row->user_id != $this->session->userdata('user_id')) {
            $course_status_changing_action = "showAjaxModal('".site_url('modal/popup/mail_on_course_status_changing_modal/active/'.$row->id.'/'.$filter_data['selected_category_id'].'/'.$filter_data['selected_instructor_id'].'/'.$filter_data['selected_price'].'/'.$filter_data['selected_status'])."', '".$course_status_changing_message."')";
          }else{
            $course_status_changing_action = "confirm_modal('".site_url('admin/change_course_status_for_admin/active/'.$row->id.'/'.$filter_data['selected_category_id'].'/'.$filter_data['selected_instructor_id'].'/'.$filter_data['selected_price'].'/'.$filter_data['selected_status'])."')";
          }
        }



        $delete_course_url = "confirm_modal('".site_url('admin/course_actions/delete/'.$row->id)."')";

        $action = '
        <div class="dropright dropright">
        <button type="button" class="btn btn-sm btn-outline-primary btn-rounded btn-icon" data-toggle="dropdown" aria-haspopup="true" aria-expanded="false">
        <i class="mdi mdi-dots-vertical"></i>
        </button>
        <ul class="dropdown-menu">
        <li><a class="dropdown-item" href="'.$view_course_on_frontend_url.'" target="_blank">'.get_phrase("view_course_on_frontend").'</a></li>
        <li><a class="dropdown-item" href="'.$edit_this_course_url.'">'.get_phrase("edit_this_course").'</a></li>
        <li><a class="dropdown-item" href="'.$section_and_lesson_url.'">'.get_phrase("section_and_lesson").'</a></li>
        <li><a class="dropdown-item" href="javascript::" onclick="'.$course_status_changing_action.'">'.$course_status_changing_message.'</a></li>
        <li><a class="dropdown-item" href="javascript::" onclick="'.$delete_course_url.'">'.get_phrase("delete").'</a></li>
        </ul>
        </div>
        ';

        $nestedData['#'] = $key+1;

        $nestedData['title'] = '<strong><a href="'.site_url('admin/course_form/course_edit/'.$row->id).'">'.$row->title.'</a></strong><br>
        <small class="text-muted">'.get_phrase('instructor').': <b>'.$instructor_details['first_name'].' '.$instructor_details['last_name'].'</b></small>';

        $nestedData['category'] = '<span class="badge badge-dark-lighten">'.$category_details['name'].'</span>';

        $nestedData['lesson_and_section'] = '
        <small class="text-muted"><b>'.get_phrase('total_section').'</b>: '.$sections->num_rows().'</small><br>
        <small class="text-muted"><b>'.get_phrase('total_lesson').'</b>: '.$lessons->num_rows().'</small><br>';

        $nestedData['enrolled_student'] = '<small class="text-muted"><b>'.get_phrase('total_enrolment').'</b>: '.$enroll_history->num_rows().'</small>';

        $nestedData['status'] = '<span class="badge '.$status_badge.'">'.get_phrase($row->status).'</span>';

        $nestedData['price'] = '<span class="badge '.$price_badge.'">'.get_phrase($price).'</span>';

        $nestedData['actions'] = $action;

        $nestedData['course_id'] = $row->id;

        $data[] = $nestedData;
      }
    }

    $json_data = array(
      "draw"            => intval($this->input->post('draw')),
      "recordsTotal"    => intval($totalData),
      "recordsFiltered" => intval($totalFiltered),
      "data"            => $data
    );

    echo json_encode($json_data);
  }

  public function pending_courses() {
    if ($this->session->userdata('admin_login') != true) {
      redirect(site_url('login'), 'refresh');
    }


    $page_data['page_name'] = 'pending_courses';
    $page_data['page_title'] = get_phrase('pending_courses');
    $this->load->view('backend/index', $page_data);
  }

  public function course_actions($param1 = "", $param2 = "") {
    if ($this->session->userdata('admin_login') != true) {
      redirect(site_url('login'), 'refresh');
    }

    if ($param1 == "add") {
      $course_id = $this->crud_model->add_course();
      redirect(site_url('admin/course_form/course_edit/'.$course_id), 'refresh');

    }
    elseif ($param1 == "edit") {
      $this->crud_model->update_course($param2);
      redirect(site_url('admin/courses'), 'refresh');

    }
    elseif ($param1 == 'delete') {
      $this->is_drafted_course($param2);
      $this->crud_model->delete_course($param2);
      redirect(site_url('admin/courses'), 'refresh');
    }
  }


  public function course_form($param1 = "", $param2 = "") {

    if ($this->session->userdata('admin_login') != true) {
      redirect(site_url('login'), 'refresh');
    }

    if ($param1 == 'add_course') {
      $page_data['languages']	= $this->crud_model->get_all_languages();
      $page_data['categories'] = $this->crud_model->get_categories();
      $page_data['page_name'] = 'course_add';
      $page_data['page_title'] = get_phrase('add_course');
      $this->load->view('backend/index', $page_data);

    }elseif ($param1 == 'course_edit') {
      $this->is_drafted_course($param2);
      $page_data['page_name'] = 'course_edit';
      $page_data['course_id'] =  $param2;
      $page_data['page_title'] = get_phrase('edit_course');
      $page_data['languages']	= $this->crud_model->get_all_languages();
      $page_data['categories'] = $this->crud_model->get_categories();
      $this->load->view('backend/index', $page_data);
    }
  }

  private function is_drafted_course($course_id){
    $course_details = $this->crud_model->get_course_by_id($course_id)->row_array();
    if ($course_details['status'] == 'draft') {
      $this->session->set_flashdata('error_message', get_phrase('you_do_not_have_right_to_access_this_course'));
      redirect(site_url('admin/courses'), 'refresh');
    }
  }

  public function change_course_status($updated_status = "") {
    $course_id = $this->input->post('course_id');
    $category_id = $this->input->post('category_id');
    $instructor_id = $this->input->post('instructor_id');
    $price = $this->input->post('price');
    $status = $this->input->post('status');
    if (isset($_POST['mail_subject']) && isset($_POST['mail_body'])) {
      $mail_subject = $this->input->post('mail_subject');
      $mail_body = $this->input->post('mail_body');
      $this->email_model->send_mail_on_course_status_changing($course_id, $mail_subject, $mail_body);
    }
    $this->crud_model->change_course_status($updated_status, $course_id);
    $this->session->set_flashdata('flash_message', get_phrase('course_status_updated'));
    redirect(site_url('admin/courses?category_id='.$category_id.'&status='.$status.'&instructor_id='.$instructor_id.'&price='.$price), 'refresh');
  }

  public function change_course_status_for_admin($updated_status = "", $course_id = "", $category_id = "", $status = "", $instructor_id = "", $price = "") {
    $this->crud_model->change_course_status($updated_status, $course_id);
    $this->session->set_flashdata('flash_message', get_phrase('course_status_updated'));
    redirect(site_url('admin/courses?category_id='.$category_id.'&status='.$status.'&instructor_id='.$instructor_id.'&price='.$price), 'refresh');
  }

  public function sections($param1 = "", $param2 = "", $param3 = "") {
    if ($this->session->userdata('admin_login') != true) {
      redirect(site_url('login'), 'refresh');
    }

    if ($param2 == 'add') {
      $this->crud_model->add_section($param1);
      $this->session->set_flashdata('flash_message', get_phrase('section_has_been_added_successfully'));
    }
    elseif ($param2 == 'edit') {
      $this->crud_model->edit_section($param3);
      $this->session->set_flashdata('flash_message', get_phrase('section_has_been_updated_successfully'));
    }
    elseif ($param2 == 'delete') {
      $this->crud_model->delete_section($param1, $param3);
      $this->session->set_flashdata('flash_message', get_phrase('section_has_been_deleted_successfully'));
    }
    redirect(site_url('admin/course_form/course_edit/'.$param1));
  }

  public function lessons($course_id = "", $param1 = "", $param2 = "") {
    if ($this->session->userdata('admin_login') != true) {
      redirect(site_url('login'), 'refresh');
    }
    if ($param1 == 'add') {
      $this->crud_model->add_lesson();
      $this->session->set_flashdata('flash_message', get_phrase('lesson_has_been_added_successfully'));
      redirect('admin/course_form/course_edit/'.$course_id);
    }
    elseif ($param1 == 'edit') {
      $this->crud_model->edit_lesson($param2);
      $this->session->set_flashdata('flash_message', get_phrase('lesson_has_been_updated_successfully'));
      redirect('admin/course_form/course_edit/'.$course_id);
    }
    elseif ($param1 == 'delete') {
      $this->crud_model->delete_lesson($param2);
      $this->session->set_flashdata('flash_message', get_phrase('lesson_has_been_deleted_successfully'));
      redirect('admin/course_form/course_edit/'.$course_id);
    }
    elseif ($param1 == 'filter') {
      redirect('admin/lessons/'.$this->input->post('course_id'));
    }
    $page_data['page_name'] = 'lessons';
    $page_data['lessons'] = $this->crud_model->get_lessons('course', $course_id);
    $page_data['course_id'] = $course_id;
    $page_data['page_title'] = get_phrase('lessons');
    $this->load->view('backend/index', $page_data);
  }

  public function watch_video($slugified_title = "", $lesson_id = "") {
    if ($this->session->userdata('admin_login') != true) {
      redirect(site_url('login'), 'refresh');
    }
    $lesson_details          = $this->crud_model->get_lessons('lesson', $lesson_id)->row_array();
    $page_data['provider']   = $lesson_details['video_type'];
    $page_data['video_url']  = $lesson_details['video_url'];
    $page_data['lesson_id']  = $lesson_id;
    $page_data['page_name']  = 'video_player';
    $page_data['page_title'] = get_phrase('video_player');
    $this->load->view('backend/index', $page_data);
  }


  // Language Functions
  public function manage_language($param1 = '', $param2 = '', $param3 = ''){
    if ($param1 == 'add_language') {
      saveDefaultJSONFile(trimmer($this->input->post('language')));
      $this->session->set_flashdata('flash_message', get_phrase('language_added_successfully'));
      redirect(site_url('admin/manage_language'), 'refresh');
    }
    if ($param1 == 'add_phrase') {
      $new_phrase = get_phrase($this->input->post('phrase'));
      $this->session->set_flashdata('flash_message', $new_phrase.' '.get_phrase('has_been_added_successfully'));
      redirect(site_url('admin/manage_language'), 'refresh');
    }

    if ($param1 == 'edit_phrase') {
      $page_data['edit_profile'] = $param2;
    }

    if ($param1 == 'delete_language') {
      if (file_exists('application/language/'.$param2.'.json')) {
        unlink('application/language/'.$param2.'.json');
        $this->session->set_flashdata('flash_message', get_phrase('language_deleted_successfully'));
        redirect(site_url('admin/manage_language'), 'refresh');
      }
    }
    $page_data['languages']				= $this->crud_model->get_all_languages();
    $page_data['page_name']				=	'manage_language';
    $page_data['page_title']			=	get_phrase('multi_language_settings');
    $this->load->view('backend/index', $page_data);
  }

  public function update_phrase_with_ajax() {
    $current_editing_language = $this->input->post('currentEditingLanguage');
    $updatedValue = $this->input->post('updatedValue');
    $key = $this->input->post('key');
    saveJSONFile($current_editing_language, $key, $updatedValue);
    echo $current_editing_language.' '.$key.' '.$updatedValue;
  }

  function message($param1 = 'message_home', $param2 = '', $param3 = '')
  {
    if ($this->session->userdata('admin_login') != 1)
    redirect(site_url('login'), 'refresh');
    if ($param1 == 'send_new') {
      $message_thread_code = $this->crud_model->send_new_private_message();
      $this->session->set_flashdata('flash_message', get_phrase('message_sent!'));
      redirect(site_url('admin/message/message_read/' . $message_thread_code), 'refresh');
    }

    if ($param1 == 'send_reply') {
      $this->crud_model->send_reply_message($param2); //$param2 = message_thread_code
      $this->session->set_flashdata('flash_message', get_phrase('message_sent!'));
      redirect(site_url('admin/message/message_read/' . $param2), 'refresh');
    }

    if ($param1 == 'message_read') {
      $page_data['current_message_thread_code'] = $param2; // $param2 = message_thread_code
      $this->crud_model->mark_thread_messages_read($param2);
    }

    $page_data['message_inner_page_name'] = $param1;
    $page_data['page_name']               = 'message';
    $page_data['page_title']              = get_phrase('private_messaging');
    $this->load->view('backend/index', $page_data);
  }

  /******MANAGE OWN PROFILE AND CHANGE PASSWORD***/
  function manage_profile($param1 = '', $param2 = '', $param3 = '')
  {
    if ($this->session->userdata('admin_login') != 1)
    redirect(site_url('login'), 'refresh');
    if ($param1 == 'update_profile_info') {
      $this->user_model->edit_user($param2);
      redirect(site_url('admin/manage_profile'), 'refresh');
    }
    if ($param1 == 'change_password') {
      $this->user_model->change_password($param2);
      redirect(site_url('admin/manage_profile'), 'refresh');
    }
    $page_data['page_name']  = 'manage_profile';
    $page_data['page_title'] = get_phrase('manage_profile');
    $page_data['edit_data']  = $this->db->get_where('users', array(
      'id' => $this->session->userdata('user_id')
    ))->result_array();
    $this->load->view('backend/index', $page_data);
  }

  public function paypal_checkout_for_instructor_revenue() {
    if ($this->session->userdata('admin_login') != 1)
    redirect(site_url('login'), 'refresh');

    $page_data['amount_to_pay']         = $this->input->post('amount_to_pay');
    $page_data['payment_id']            = $this->input->post('payment_id');
    $page_data['course_title']          = $this->input->post('course_title');
    $page_data['instructor_name']       = $this->input->post('instructor_name');
    $page_data['production_client_id']  = $this->input->post('production_client_id');
    $this->load->view('backend/admin/paypal_checkout_for_instructor_revenue', $page_data);
  }


  // PAYPAL CHECKOUT ACTIONS
  public function paypal_payment($payment_id = "", $paypalPaymentID = "", $paypalPaymentToken = "", $paypalPayerID = "") {
    $payment_details = $this->db->get_where('payment', array('id' => $payment_id))->row_array();
    $course_id = $payment_details['course_id'];
    $course_details = $this->crud_model->get_course_by_id($course_id)->row_array();
    $instructor_id = $course_details['user_id'];
    $instructor_data = $this->db->get_where('users', array('id' => $instructor_id))->row_array();
    $paypal_keys = json_decode($instructor_data['paypal_keys'], true);
    $production_client_id = $paypal_keys[0]['production_client_id'];
    $production_secret_key = $paypal_keys[0]['production_secret_key'];
    // $production_client_id = 'AZDxjDScFpQtjWTOUtWKbyN_bDt4OgqaF4eYXlewfBP4-8aqX3PiV8e1GWU6liB2CUXlkA59kJXE7M6R';
    // $production_secret_key = 'EFI50pO1s1cV1cySQ85wg2Pncn4VOPxKvTLBhyeGtd1QHNac-OJFsQlS7GAwlXZSg2wtm-BOJ9Ar3XJy';

    //THIS IS HOW I CHECKED THE PAYPAL PAYMENT STATUS
    $status = $this->payment_model->paypal_payment($paypalPaymentID, $paypalPaymentToken, $paypalPayerID, $production_client_id, $production_secret_key);
    if (!$status) {
      $this->session->set_flashdata('error_message', get_phrase('an_error_occurred_during_payment'));
      redirect(site_url('admin/instructor_revenue'), 'refresh');
    }
    $this->crud_model->update_instructor_payment_status($payment_id);
    $this->session->set_flashdata('flash_message', get_phrase('instructor_payment_has_been_done'));
    redirect(site_url('admin/instructor_revenue'), 'refresh');
  }

  public function stripe_checkout_for_instructor_revenue() {
    if ($this->session->userdata('admin_login') != 1)
    redirect(site_url('login'), 'refresh');

    $page_data['amount_to_pay']    = $this->input->post('amount_to_pay');
    $page_data['payment_id']       = $this->input->post('payment_id');
    $page_data['course_title']     = $this->input->post('course_title');
    $page_data['instructor_name']  = $this->input->post('instructor_name');
    $page_data['public_live_key']  = $this->input->post('public_live_key');
    $page_data['secret_live_key']  = $this->input->post('secret_live_key');
    $this->load->view('backend/admin/stripe_checkout_for_instructor_revenue', $page_data);
  }

  // STRIPE CHECKOUT ACTIONS
  public function stripe_payment($payment_id = "") {
    //THIS IS HOW I CHECKED THE STRIPE PAYMENT STATUS
    $token_id = $this->input->post('stripeToken');
    $payment_details = $this->db->get_where('payment', array('id' => $payment_id))->row_array();
    $course_id = $payment_details['course_id'];
    $course_details = $this->crud_model->get_course_by_id($course_id)->row_array();
    $instructor_id = $course_details['user_id'];
    $instructor_data = $this->db->get_where('users', array('id' => $instructor_id))->row_array();
    $stripe_keys = json_decode($instructor_data['stripe_keys'], true);

    $status = $this->payment_model->stripe_payment($token_id, $this->session->userdata('user_id'), $payment_details['instructor_revenue'], $stripe_keys[0]['secret_live_key']);

    if (!$status) {
      $this->session->set_flashdata('error_message', get_phrase('an_error_occurred_during_payment'));
      redirect(site_url('admin/instructor_revenue'), 'refresh');
    }
    $this->crud_model->update_instructor_payment_status($payment_id);
    $this->session->set_flashdata('flash_message', get_phrase('instructor_payment_has_been_done'));
    redirect(site_url('admin/instructor_revenue'), 'refresh');
  }

  public function preview($course_id = '') {
    if ($this->session->userdata('admin_login') != 1)
    redirect(site_url('login'), 'refresh');

    $this->is_drafted_course($course_id);
    if ($course_id > 0) {
      $courses = $this->crud_model->get_course_by_id($course_id);
      if ($courses->num_rows() > 0) {
        $course_details = $courses->row_array();
        redirect(site_url('home/lesson/'.slugify($course_details['title']).'/'.$course_details['id']), 'refresh');
      }
    }
    redirect(site_url('admin/courses'), 'refresh');
  }

  // Manage Quizes
  public function quizes($course_id = "", $action = "", $quiz_id = "") {
    if ($this->session->userdata('admin_login') != true) {
      redirect(site_url('login'), 'refresh');
    }

    if ($action == 'add') {
      $this->crud_model->add_quiz($course_id);
      $this->session->set_flashdata('flash_message', get_phrase('quiz_has_been_added_successfully'));
    }
    elseif ($action == 'edit') {
      $this->crud_model->edit_quiz($quiz_id);
      $this->session->set_flashdata('flash_message', get_phrase('quiz_has_been_updated_successfully'));
    }
    elseif ($action == 'delete') {
      $this->crud_model->delete_section($course_id, $quiz_id);
      $this->session->set_flashdata('flash_message', get_phrase('quiz_has_been_deleted_successfully'));
    }
    redirect(site_url('admin/course_form/course_edit/'.$course_id));
  }

  // Manage Quize Questions
  public function quiz_questions($quiz_id = "", $action = "", $question_id = "") {
    if ($this->session->userdata('admin_login') != true) {
      redirect(site_url('login'), 'refresh');
    }
    $quiz_details = $this->crud_model->get_lessons('lesson', $quiz_id)->row_array();

    if ($action == 'add') {
      $response = $this->crud_model->add_quiz_questions($quiz_id);
      echo $response;
    }

    elseif ($action == 'edit') {
      $response = $this->crud_model->update_quiz_questions($question_id);
      echo $response;
    }

    elseif ($action == 'delete') {
      $response = $this->crud_model->delete_quiz_question($question_id);
      $this->session->set_flashdata('flash_message', get_phrase('question_has_been_deleted'));
      redirect(site_url('admin/course_form/course_edit/'.$quiz_details['course_id']));
    }
  }

  // software about page
  function about() {
    if ($this->session->userdata('admin_login') != 1)
    redirect(site_url('login'), 'refresh');

    $page_data['application_details'] = $this->crud_model->get_application_details();
    $page_data['page_name']  = 'about';
    $page_data['page_title'] = get_phrase('about');
    $this->load->view('backend/index', $page_data);
  }

  public function install_theme($theme_to_install = '')
  {

    if ($this->session->userdata('admin_login') != 1){
      redirect(site_url('login'), 'refresh');
    }

    $uninstalled_themes = $this->crud_model->get_uninstalled_themes();
    if (!in_array($theme_to_install, $uninstalled_themes)) {
      $this->session->set_flashdata('error_message', get_phrase('this_theme_is_not_available'));
      redirect(site_url('admin/theme_settings'));
    }

    $zipped_file_name = $theme_to_install;
    $unzipped_file_name = substr($zipped_file_name, 0, -4);
    // Create update directory.
    $views_directory  = 'application/views/frontend';
    $assets_directory = 'assets/frontend';

    //Unzip theme zip file and remove zip file.
    $theme_path = 'themes/'.$zipped_file_name;
    $theme_zip = new ZipArchive;
    $theme_result = $theme_zip->open($theme_path);
    if ($theme_result === TRUE) {
      $theme_zip->extractTo('themes');
      $theme_zip->close();
    }

    // unzip the views zip file to the application>views folder
    $views_path = 'themes/'.$unzipped_file_name.'/views/'.$zipped_file_name;
    $views_zip = new ZipArchive;
    $views_result = $views_zip->open($views_path);
    if ($views_result === TRUE) {
      $views_zip->extractTo($views_directory);
      $views_zip->close();
    }

    // unzip the assets zip file to the assets/frontend folder
    $assets_path = 'themes/'.$unzipped_file_name.'/assets/'.$zipped_file_name;
    $assets_zip = new ZipArchive;
    $assets_result = $assets_zip->open($assets_path);
    if ($assets_result === TRUE) {
      $assets_zip->extractTo($assets_directory);
      $assets_zip->close();
    }

    unlink($theme_path);
    $this->crud_model->remove_files_and_folders('themes/'.$unzipped_file_name);
    $this->session->set_flashdata('flash_message', get_phrase('theme_imported_successfully'));
    redirect(site_url('admin/theme_settings'));
  }

  //ADDON MANAGER PORTION STARTS HERE
  public function addon($param1 = "", $param2 = "", $param3 = "") {
    if ($this->session->userdata('admin_login') != 1){
      redirect(site_url('login'), 'refresh');
    }
    // ADD NEW ADDON FORM
    if ($param1 == 'add') {

      $page_data['page_name'] = 'addon_add';
      $page_data['page_title'] = get_phrase('add_addon');
    }

    // INSTALLING AN ADDON
    if ($param1 == 'install') {
        $this->addon_model->install_addon();
    }

    // ACTIVATING AN ADDON
    if ($param1 == 'activate') {
      $update_message = $this->addon_model->addon_activate($param2);
      $this->session->set_flashdata('flash_message', get_phrase($update_message));
      redirect(site_url('admin/addon'), 'refresh');
    }

    // DEACTIVATING AN ADDON
    if ($param1 == 'deactivate') {
      $update_message = $this->addon_model->addon_deactivate($param2);
      $this->session->set_flashdata('flash_message', get_phrase($update_message));
      redirect(site_url('admin/addon'), 'refresh');
    }

    // REMOVING AN ADDON
    if ($param1 == 'delete') {
      $this->addon_model->addon_delete($param2);
      $this->session->set_flashdata('flash_message', get_phrase('addon_is_deleted_successfully'));
      redirect(site_url('admin/addon'), 'refresh');
    }

    // SHOWING LIST OF INSTALLED ADDONS
    if (empty($param1)) {
      $page_data['page_name'] = 'addons';
      $page_data['addons'] = $this->addon_model->addon_list()->result_array();
      $page_data['page_title'] = get_phrase('addon_manager');
    }
    $this->load->view('backend/index', $page_data);
  }

  //AVAILABLE_ADDONS
  public function available_addons(){
    if ($this->session->userdata('admin_login') != 1)
    redirect(site_url('login'), 'refresh');

    $page_data['page_name']  = 'available_addon';
    $page_data['page_title'] = get_phrase('available_addon');
    $this->load->view('backend/index', $page_data);
  }

  // AJAX PORTION
  // this function is responsible for managing multiple choice question
  function manage_multiple_choices_options() {
    $page_data['number_of_options'] = $this->input->post('number_of_options');
    $this->load->view('backend/admin/manage_multiple_choices_options', $page_data);
  }

  public function ajax_get_sub_category($category_id) {
    $page_data['sub_categories'] = $this->crud_model->get_sub_categories($category_id);

    return $this->load->view('backend/admin/ajax_get_sub_category', $page_data);
  }

  public function ajax_get_section($course_id){
    $page_data['sections'] = $this->crud_model->get_section('course', $course_id)->result_array();
    return $this->load->view('backend/admin/ajax_get_section', $page_data);
  }

  public function ajax_get_video_details() {
    $video_details = $this->video_model->getVideoDetails($_POST['video_url']);
    echo $video_details['duration'];
  }
  public function ajax_sort_section() {
    $section_json = $this->input->post('itemJSON');
    $this->crud_model->sort_section($section_json);
  }
  public function ajax_sort_lesson() {
    $lesson_json = $this->input->post('itemJSON');
    $this->crud_model->sort_lesson($lesson_json);
  }
  public function ajax_sort_question() {
    $question_json = $this->input->post('itemJSON');
    $this->crud_model->sort_question($question_json);
  }
}
