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<?php
/**
 * Manage Instructor
 *
 * @package Tutor
 * @author Themeum <support@themeum.com>
 * @link https://themeum.com
 * @since 1.0.0
 */

namespace TUTOR;

if ( ! defined( 'ABSPATH' ) ) {
	exit;
}

/**
 * Instructor class
 *
 * @since 1.0.0
 */
class Instructor {

/**
	 * Error message
	 *
	 * @var string
	 */
	protected $error_msgs = '';

/**
	 * Constructor
	 *
	 * @since 1.0.0
	 *
	 * @param bool $register_hook register hook or not.
	 *
	 * @return void
	 */
	public function __construct( $register_hook = true ) {
		if ( ! $register_hook ) {
			return;
		}
		add_action( 'template_redirect', array( $this, 'register_instructor' ) );
		add_action( 'template_redirect', array( $this, 'apply_instructor' ) );

// Add instructor from admin panel.
		add_action( 'wp_ajax_tutor_add_instructor', array( $this, 'add_new_instructor' ) );

/**
		 * Instructor Approval
		 * Block Unblock
		 *
		 * @since 1.5.3
		 */
		add_action( 'wp_ajax_instructor_approval_action', array( $this, 'instructor_approval_action' ) );

/**
		 * Check if instructor can publish courses
		 *
		 * @since 1.5.9
		 */
		add_action( 'tutor_option_save_after', array( $this, 'can_publish_tutor_courses' ) );

/**
		 * Hide instructor rejection message
		 *
		 * @since 1.9.2
		 */
		add_action( 'wp_loaded', array( $this, 'hide_instructor_notice' ) );
	}

/**
	 * Template Redirect Callback
	 * For Register new user and mark him as instructor
	 *
	 * @since 1.0.0
	 * @return void|null
	 */
	public function register_instructor() {
		// Here tutor_action checking required before nonce checking.
		if ( 'tutor_register_instructor' !== Input::post( 'tutor_action' ) || ! get_option( 'users_can_register', false ) ) {
			return;
		}

// Checking nonce.
		tutor_utils()->checking_nonce();

$required_fields = apply_filters(
			'tutor_instructor_registration_required_fields',
			array(
				'first_name'            => __( 'First name field is required', 'tutor' ),
				'last_name'             => __( 'Last name field is required', 'tutor' ),
				'email'                 => __( 'E-Mail field is required', 'tutor' ),
				'user_login'            => __( 'User Name field is required', 'tutor' ),
				'password'              => __( 'Password field is required', 'tutor' ),
				'password_confirmation' => __( 'Password Confirmation field is required', 'tutor' ),
			)
		);

$validation_errors = array();

/*
		* Push into validation_errors
		* Error registration_errors
		*/
		$errors = apply_filters( 'registration_errors', new \WP_Error(), '', '' );
		foreach ( $errors->errors as $key => $value ) {
			$validation_errors[ $key ] = $value[0];
		}

foreach ( $required_fields as $required_key => $required_value ) {
			if ( empty( $_POST[ $required_key ] ) ) { //phpcs:ignore WordPress.Security.NonceVerification.Missing
				$validation_errors[ $required_key ] = $required_value;
			}
		}

if ( ! filter_var( tutor_utils()->input_old( 'email' ), FILTER_VALIDATE_EMAIL ) ) {
			$validation_errors['email'] = __( 'Valid E-Mail is required', 'tutor' );
		}
		if ( tutor_utils()->input_old( 'password' ) !== tutor_utils()->input_old( 'password_confirmation' ) ) {
			$validation_errors['password_confirmation'] = __( 'Your passwords should match each other. Please recheck.', 'tutor' );
		}

if ( count( $validation_errors ) ) {
			$this->error_msgs = $validation_errors;
			add_filter( 'tutor_instructor_register_validation_errors', array( $this, 'tutor_instructor_form_validation_errors' ) );
			return;
		}

$userdata = array(
			'user_login' => $user_login,
			'user_email' => $email,
			'first_name' => $first_name,
			'last_name'  => $last_name,
			'user_pass'  => $password,
		);

global $wpdb;
		$wpdb->query( 'START TRANSACTION' );

$user_id = wp_insert_user( $userdata );

if ( is_wp_error( $user_id ) ) {
			$this->error_msgs = $user_id->get_error_messages();
			add_filter( 'tutor_instructor_register_validation_errors', array( $this, 'tutor_instructor_form_validation_errors' ) );
			return;
		}

$is_req_email_verification = apply_filters( 'tutor_require_email_verification', false );

if ( $is_req_email_verification ) {
			do_action( 'tutor_send_verification_mail', get_userdata( $user_id ), 'instructor-registration' );
			$reg_done = apply_filters( 'tutor_registration_done', true );
			if ( ! $reg_done ) {
				$wpdb->query( 'ROLLBACK' );
				return;
			} else {
				$wpdb->query( 'COMMIT' );
			}
		} else {
			/**
			 * Tutor Free - regular instructor reg process.
			 */
			$this->update_instructor_meta( $user_id );
			$wpdb->query( 'COMMIT' );
			$user = get_user_by( 'id', $user_id );
			if ( $user ) {
				wp_set_current_user( $user_id, $user->user_login );
				wp_set_auth_cookie( $user_id );
				do_action( 'tutor_after_instructor_signup', $user_id );
			}
		}

wp_redirect( tutor_utils()->input_old( '_wp_http_referer' ) );
		die();
	}

/**
	 * Get instructor reg validation errors.
	 *
	 * @since 1.0.0
	 * @return string
	 */
	public function tutor_instructor_form_validation_errors() {
		return $this->error_msgs;
	}

/**
	 * Template Redirect Callback
	 * for instructor applying when a user already logged in
	 *
	 * @since 1.0.0
	 * @return void|null
	 */
	public function apply_instructor() {
		// Here tutor_action checking required before nonce checking.
		if ( 'tutor_apply_instructor' !== Input::post( 'tutor_action' ) ) {
			return;
		}

// Checking nonce.
		tutor_utils()->checking_nonce();

$user_id = get_current_user_id();
		if ( $user_id ) {
			if ( tutor_utils()->is_instructor() ) {
				die( esc_html__( 'Already applied for instructor', 'tutor' ) );
			} else {
				update_user_meta( $user_id, '_is_tutor_instructor', tutor_time() );
				update_user_meta( $user_id, '_tutor_instructor_status', apply_filters( 'tutor_initial_instructor_status', 'pending' ) );

do_action( 'tutor_new_instructor_after', $user_id );
			}
		} else {
			die( esc_html__( 'Permission denied', 'tutor' ) );
		}

wp_redirect( tutor_utils()->input_old( '_wp_http_referer' ) );
		die();
	}

/**
	 * Add new instructor
	 *
	 * @since 1.0.0
	 * @return void
	 */
	public function add_new_instructor() {
		tutor_utils()->checking_nonce();

// Only admin should be able to add instructor.
		if ( ! current_user_can( 'manage_options' ) || ! get_option( 'users_can_register', false ) ) {
			wp_send_json_error();
		}

$required_fields = apply_filters(
			'tutor_instructor_registration_required_fields',
			array(
				'first_name'            => __( 'First name field is required', 'tutor' ),
				'last_name'             => __( 'Last name field is required', 'tutor' ),
				'email'                 => __( 'E-Mail field is required', 'tutor' ),
				'user_login'            => __( 'User Name field is required', 'tutor' ),
				'password'              => __( 'Password field is required', 'tutor' ),
				'password_confirmation' => __( 'Your passwords should match each other. Please recheck.', 'tutor' ),
			)
		);

$validation_errors = array();
		foreach ( $required_fields as $required_key => $required_value ) {
			if ( empty( $_POST[ $required_key ] ) ) { //phpcs:ignore WordPress.Security.NonceVerification.Missing
				$validation_errors[ $required_key ] = $required_value;
			}
		}

if ( count( $validation_errors ) ) {
			wp_send_json_error( array( 'errors' => $validation_errors ) );
		}

$first_name              = sanitize_text_field( tutor_utils()->input_old( 'first_name' ) );
		$last_name               = sanitize_text_field( tutor_utils()->input_old( 'last_name' ) );
		$email                   = sanitize_text_field( tutor_utils()->input_old( 'email' ) );
		$user_login              = sanitize_text_field( tutor_utils()->input_old( 'user_login' ) );
		$phone_number            = sanitize_text_field( tutor_utils()->input_old( 'phone_number' ) );
		$password                = sanitize_text_field( tutor_utils()->input_old( 'password' ) );
		$tutor_profile_bio       = Input::post( 'tutor_profile_bio', '', Input::TYPE_KSES_POST );
		$tutor_profile_job_title = sanitize_text_field( tutor_utils()->input_old( 'tutor_profile_job_title' ) );

$userdata = apply_filters(
			'add_new_instructor_data',
			array(
				'user_login' => $user_login,
				'user_email' => $email,
				'first_name' => $first_name,
				'last_name'  => $last_name,
				'role'       => tutor()->instructor_role,
				'user_pass'  => $password,
			)
		);

do_action( 'tutor_add_new_instructor_before' );

$user_id = wp_insert_user( $userdata );
		if ( ! is_wp_error( $user_id ) ) {
			update_user_meta( $user_id, 'phone_number', $phone_number );
			update_user_meta( $user_id, 'description', $tutor_profile_bio );
			update_user_meta( $user_id, '_tutor_profile_bio', $tutor_profile_bio );
			update_user_meta( $user_id, '_tutor_profile_job_title', $tutor_profile_job_title );
			update_user_meta( $user_id, '_is_tutor_instructor', tutor_time() );
			update_user_meta( $user_id, '_tutor_instructor_status', apply_filters( 'tutor_initial_instructor_status', 'approved' ) );

do_action( 'tutor_add_new_instructor_after', $user_id );

wp_send_json_success( array( 'msg' => __( 'Instructor has been added successfully', 'tutor' ) ) );
		}

wp_send_json_error( array( 'errors' => $user_id ) );
	}

/**
	 * Handle instructor approval action
	 * This function not used maybe, will be removed
	 *
	 * @since 1.0.0
	 * @return void
	 */
	public function instructor_approval_action() {
		tutor_utils()->checking_nonce();

if ( ! current_user_can( 'manage_options' ) ) {
			wp_send_json_error( array( 'message' => __( 'Access Denied', 'tutor' ) ) );
		}

$instructor_id = Input::post( 'instructor_id', 0, Input::TYPE_INT );
		$action        = Input::post( 'action_name' );

if ( 'approve' === $action ) {
			do_action( 'tutor_before_approved_instructor', $instructor_id );

update_user_meta( $instructor_id, '_tutor_instructor_status', 'approved' );
			update_user_meta( $instructor_id, '_tutor_instructor_approved', tutor_time() );

$instructor = new \WP_User( $instructor_id );
			$instructor->add_role( tutor()->instructor_role );

// Send E-Mail to this user about instructor approval via hook.
			do_action( 'tutor_after_approved_instructor', $instructor_id );
		}

if ( 'blocked' === $action ) {
			do_action( 'tutor_before_blocked_instructor', $instructor_id );
			update_user_meta( $instructor_id, '_tutor_instructor_status', 'blocked' );

$instructor = new \WP_User( $instructor_id );
			$instructor->remove_role( tutor()->instructor_role );
			do_action( 'tutor_after_blocked_instructor', $instructor_id );

// TODO: send E-Mail to this user about instructor blocked, should via hook.
		}

if ( 'remove-instructor' === $action ) {
			do_action( 'tutor_before_rejected_instructor', $instructor_id );

$user = new \WP_User( $instructor_id );
			$user->remove_role( tutor()->instructor_role );

tutor_utils()->remove_instructor_role( $instructor_id );
			update_user_meta( $instructor_id, '_is_tutor_instructor_rejected', tutor_time() );
			update_user_meta( $instructor_id, 'tutor_instructor_show_rejection_message', true );

// Send E-Mail to this user about instructor rejection via hook.
			do_action( 'tutor_after_rejected_instructor', $instructor_id );
		}

wp_send_json_success();
	}

/**
	 * Hide instructor notice
	 *
	 * @since 1.0.0
	 * @return void
	 */
	public function hide_instructor_notice() {
		if ( 'hide_instructor_notice' === Input::get( 'tutor_action' ) ) {
			delete_user_meta( get_current_user_id(), 'tutor_instructor_show_rejection_message' );
		}
	}

/**
	 * Can instructor publish courses directly
	 * Fixed in Gutenberg
	 *
	 * @since 1.5.9
	 * @return void
	 */
	public function can_publish_tutor_courses() {
		$can_publish_course = (bool) tutor_utils()->get_option( 'instructor_can_publish_course' );

$instructor_role = tutor()->instructor_role;
		$instructor      = get_role( $instructor_role );

if ( $can_publish_course ) {
			$instructor->add_cap( 'publish_tutor_courses' );
		} else {
			$instructor->remove_cap( 'publish_tutor_courses' );
		}
	}

/**
	 * Update instructor meta just after register
	 *
	 * @since 2.1.9
	 *
	 * @param integer $user_id user id.
	 *
	 * @return void
	 */
	public function update_instructor_meta( int $user_id ) {
		update_user_meta( $user_id, '_is_tutor_instructor', tutor_time() );
		update_user_meta( $user_id, '_tutor_instructor_status', apply_filters( 'tutor_initial_instructor_status', 'pending' ) );

do_action( 'tutor_new_instructor_after', $user_id );
	}
}