<?php
/**
 * Students list widget class.
 *
 * @author   ThimPress
 * @package  LearnPress/Students-List/Classes
 * @version  3.0.1
 */

// Prevent loading this file directly
defined( 'ABSPATH' ) || exit;

if ( ! class_exists( 'LP_Students_List' ) ) {
	/**
	 * Class LP_Students_List.
	 */
	class LP_Students_List extends WP_Widget {

		/**
		 * LP_Students_List constructor.
		 */
		public function __construct() {
			parent::__construct(
				'students_list_widget',
				__( 'Learnpress - Students List', 'learnpress-students-list' ),
				array( 'description' => __( 'Display students list of course.', 'learnpress-students-list' ) )
			);
		}

		/**
		 * Front-end display
		 *
		 * @param array $args
		 * @param array $instance
		 */
		public function widget( $args, $instance ) {
			wp_enqueue_style( 'addon-lp-students-list' );
			wp_enqueue_script( 'addon-lp-students-list' );

			echo $args['before_widget'];

			if ( ! empty( $instance['title'] ) ) {
				echo $args['before_title'] . apply_filters( 'widget_title', $instance['title'] ) . $args['after_title'];
			}

			if ( ! empty( $instance['course_id'] ) ) {
				$course_id  = sanitize_text_field( $instance['course_id'] );
				$course_ids = explode( ',', $course_id );
				foreach ( $course_ids as $course_id ) {
					$course = learn_press_get_course( $course_id );
					echo sprintf(
						'%s: <a href="%s">%s</a>',
						esc_html__( 'Course', 'learnpress-students-list' ),
						$course->get_permalink(),
						$course->get_title()
					);

					do_action( 'lp-addon-students-list/students-list/layout', $course );
				}
			} else {
				echo __( 'Please enter Course ID.', 'learnpress-students-list' );
			}

			echo $args['after_widget'];
		}

		/**
		 * @param array $instance
		 *
		 * @return string|void
		 */
		public function form( $instance ) {
			$title     = ! empty( $instance['title'] ) ? $instance['title'] : __( 'Students List', 'learnpress-students-list' );
			$course_id = ! empty( $instance['course_id'] ) ? $instance['course_id'] : '';
			$number    = ! empty( $instance['number_student'] ) ? $instance['number_student'] : '';
			$filter    = ! empty( $instance['filter'] ) ? $instance['filter'] : '';
			?>
			<p>
				<label for="<?php echo $this->get_field_id( 'title' ); ?>">
					<?php _e( 'Title:', 'learnpress-students-list' ); ?>
				</label>
				<input class="widefat" id="<?php echo $this->get_field_id( 'title' ); ?>"
					   name="<?php echo $this->get_field_name( 'title' ); ?>" type="text"
					   value="<?php echo esc_attr( $title ); ?>">
			</p>
			<p>
				<label for="<?php echo $this->get_field_id( 'course_id' ); ?>">
					<?php _e( 'Course ID:', 'learnpress-students-list' ); ?>
				</label>
				<input style="width: 100%" type="text" value="<?php echo esc_attr( $course_id ); ?>"
					   id="<?php echo $this->get_field_id( 'course_id' ); ?>"
					   name="<?php echo $this->get_field_name( 'course_id' ); ?>">
				<span class="field-description">
					<i><?php echo esc_html__( 'Course IDs separated by commas (,)', 'learnpress-students-list' ); ?></i>
				</span>
			</p>
			<p>
				<label for="<?php echo $this->get_field_id( 'number_student' ); ?>">
					<?php _e( 'Number students to show:', 'learnpress-students-list' ); ?>
				</label>
				<input type="number" class="tiny-text" size="3" min="1" step="1"
					   value="<?php echo esc_attr( $number ); ?>"
					   id="<?php echo $this->get_field_id( 'number_student' ); ?>"
					   name="<?php echo $this->get_field_name( 'number_student' ); ?>">
			</p>
			<p>
				<label for="<?php echo $this->get_field_id( 'filter' ); ?>">
					<?php _e( 'Filter:', 'learnpress-students-list' ); ?>
					<select class='widefat' id="<?php echo $this->get_field_id( 'filter' ); ?>"
							name="<?php echo $this->get_field_name( 'filter' ); ?>" type="text">
						<?php
						$filters_students = learn_press_get_students_list_filter();

						if ( is_array( $filters_students ) ) {
							foreach ( $filters_students as $key => $_filter ) {
								?>
								<option
									value="<?php echo esc_attr( $key ); ?>" <?php echo ( $filter == $key ) ? ' selected' : ''; ?>><?php esc_html_e( $_filter, 'learnpress-students-list' ); ?></option>
								<?php
							}
						}
						?>
					</select>
				</label>
			</p>
			<?php
		}

		/**
		 * Sanitize widget form values as they are saved.
		 *
		 * @param array $new_instance
		 * @param array $old_instance
		 *
		 * @return array
		 */
		public function update( $new_instance, $old_instance ) {
			$instance                   = array();
			$instance['title']          = ( ! empty( $new_instance['title'] ) ) ? strip_tags( $new_instance['title'] ) : '';
			$instance['course_id']      = ( ! empty( $new_instance['course_id'] ) ) ? strip_tags( $new_instance['course_id'] ) : '';
			$instance['number_student'] = ( ! empty( $new_instance['number_student'] ) ) ? strip_tags( $new_instance['number_student'] ) : '';
			$instance['filter']         = ( ! empty( $new_instance['filter'] ) ) ? strip_tags( $new_instance['filter'] ) : '';

			return $instance;
		}
	}
}

if ( ! function_exists( 'register_students_list_widget' ) ) {
	/**
	 * Register widget.
	 */
	function register_students_list_widget() {
		register_widget( 'LP_Students_List' );
	}
}

add_action( 'widgets_init', 'register_students_list_widget' );