class LLMS_Table_Student_Course extends LLMS_Admin_Table {

	/**
	 * Unique ID for the Table
	 *
	 * @var  string
	 */
	protected $id = 'student-course';

	/**
	 * Stores the current section while building the table
	 * used by $this->output_section_row_html() to determine
	 * if a new section header needs to be output
	 *
	 * @var  int
	 */
	private $current_section = null;

	/**
	 * If true, tfoot will add ajax pagination links
	 *
	 * @var  boolean
	 */
	protected $is_paginated = false;

	/**
	 * Results sort order
	 * 'ASC' or 'DESC'
	 * Only applicable of $orderby is not set
	 *
	 * @var  string
	 */
	protected $order = 'ASC';

	/**
	 * Field results are sorted by
	 *
	 * @var  string
	 */
	protected $orderby = 'name';

	/**
	 * Instance of LLMS_Student
	 *
	 * @var  null
	 */
	public $student = null;

	/**
	 * Get the HTML for the actions column on the table
	 *
	 * @param   obj $lesson LLMS_Lesson..
	 * @return  string
	 * @since   3.29.0
	 * @version 3.29.0
	 */
	private function get_actions_html( $lesson ) {

		$html = '';

		if ( llms_show_mark_complete_button( $lesson ) ) {

			if ( $this->student->is_complete( $lesson->get( 'id' ) ) ) {
				$action = 'incomplete';
				$icon   = 'exclamation-triangle';
				$text   = __( 'Mark Incomplete', 'lifterlms' );
			} else {
				$action = 'complete';
				$icon   = 'check';
				$text   = __( 'Mark Complete', 'lifterlms' );
			}
			$html = '
				<form action="" method="POST">
					<input name="student_id" type="hidden" value="' . $this->student->get( 'id' ) . '">
					<input name="lesson_id" type="hidden" value="' . $lesson->get( 'id' ) . '">
					<button class="llms-button-secondary square small tip--bottom-left" data-tip="' . esc_attr( $text ) . '" name="llms-lesson-action" type="submit" value="' . $action . '">
						<i class="fa fa-' . $icon . '" aria-hidden="true"></i>
					</button>
					' . wp_nonce_field( 'llms-admin-lesson-progression', 'llms-admin-progression-nonce', false, false ) . '
				</form>
			';

		}
		return $html;

	}

	/**
	 * Retrieve data for the columns
	 *
	 * @param    string $key        the column id / key
	 * @param    int    $lesson     Instance of an LLMS_Lesson
	 * @return   mixed
	 * @since    3.2.0
	 * @version  3.29.0
	 */
	public function get_data( $key, $lesson ) {

		switch ( $key ) {

			case 'actions':
				$value = $this->get_actions_html( $lesson );
				break;

			case 'completed':
				$date  = $this->student->get_completion_date( $lesson->get( 'id' ) );
				$value = $date ? $date : '&ndash;';
				break;

			case 'grade':
				$grade = $this->student->get_grade( $lesson->get( 'id' ) );
				$value = is_numeric( $grade ) ? $grade . '%' : $grade;
				break;

			case 'id':
				$value = $this->get_post_link( $lesson->get( 'id' ) );
				break;

			case 'name':
				$value = $lesson->get( 'title' );
				break;

			case 'quiz':
				$q = $lesson->get( 'quiz' );

				if ( $q ) {

					$url   = esc_url(
						add_query_arg(
							array(
								'quiz_id'   => $q,
								'lesson_id' => $lesson->get( 'id' ),
							)
						)
					);
					$value = '<a href="' . $url . '">' . get_the_title( $q ) . '</a>';

				} else {
					$value = '&ndash;';
				}

				break;

			default:
				$value = $key;

		}// End switch.

		return $this->filter_get_data( $value, $key, $lesson );

	}

	/**
	 * Execute a query to retrieve results from the table
	 *
	 * @param    array $args  array of query args
	 * @return   void
	 * @since    3.2.0
	 * @version  3.2.0
	 */
	public function get_results( $args = array() ) {

		$course = new LLMS_Course( absint( $args['course_id'] ) );

		if ( is_numeric( $args['student'] ) ) {
			$args['student'] = new LLMS_Student( $args['student'] );
		}

		$this->student = $args['student'];

		$this->tbody_data = $course->get_lessons();

	}

	/**
	 * Output a section title row for each course Section
	 *
	 * @param    obj $lesson  the current lesson instance
	 * @return   void
	 * @since    3.2.0
	 * @version  3.21.0
	 */
	public function output_section_row_html( $lesson ) {

		if ( $lesson instanceof LLMS_Lesson ) {

			$sid = $lesson->get_parent_section();

			if ( $this->current_section !== $sid ) {
				echo '<tr><td class="id">' . $sid . '</td><td class="section-title" colspan="' . ( $this->get_columns_count() - 1 ) . '">' . sprintf( _x( 'Section: %s', 'section title', 'lifterlms' ), get_the_title( $sid ) ) . '</td></tr>';
				$this->current_section = $sid;
			}
		}

	}

	/**
	 * Allow custom hooks to be registered for use within the class
	 *
	 * @return   void
	 * @since    3.2.0
	 * @version  3.21.0
	 */
	protected function register_hooks() {
		add_action( 'llms_table_before_tr', array( $this, 'output_section_row_html' ), 10, 1 );
	}

	/**
	 * Define the structure of arguments used to pass to the get_results method
	 *
	 * @since    2.3.0
	 * @since 3.35.0 Get student ID more reliably.
	 *
	 * @return   array
	 */
	public function set_args() {

		$student = false;
		if ( ! empty( $this->student ) ) {
			$student = $this->student->get_id();
		} elseif ( ! empty( $_GET['student_id'] ) ) { // phpcs:ignore WordPress.Security.NonceVerification.Recommended
			$student = llms_filter_input( INPUT_GET, 'student_id', FILTER_SANITIZE_NUMBER_INT );
		}

		return array(
			'page'    => $this->get_current_page(),
			'student' => $student,
		);
	}

	/**
	 * Define the structure of the table
	 *
	 * @return   array
	 * @since    3.2.0
	 * @version  3.29.0
	 */
	public function set_columns() {
		return array(
			'id'        => array(
				'title' => __( 'ID', 'lifterlms' ),
			),
			'name'      => array(
				'title' => __( 'Name', 'lifterlms' ),
			),
			'quiz'      => array(
				'title' => __( 'Quiz', 'lifterlms' ),
			),
			'grade'     => array(
				'title' => __( 'Grade', 'lifterlms' ),
			),
			'completed' => array(
				'title' => __( 'Completed', 'lifterlms' ),
			),
			'actions'   => array(
				'exportable' => false,
				'title'      => __( 'Actions', 'lifterlms' ),
			),
		);
	}

}