<?php

/*
 * the language switcher widget
 *
 * @since 0.1
 */
class PLL_Widget_Languages extends WP_Widget {

	/*
	 * constructor
	 *
	 * @since 0.1
	 */
	function __construct() {
		parent::__construct( 'polylang', __( 'Language Switcher', 'polylang' ), array( 'description' => __( 'Displays a language switcher', 'polylang' ) ) );
	}

	/*
	 * displays the widget
	 *
	 * @since 0.1
	 *
	 * @param array $args Display arguments including before_title, after_title, before_widget, and after_widget.
	 * @param array $instance The settings for the particular instance of the widget
	 */
	function widget( $args, $instance ) {
		// sets a unique id for dropdown
		$instance['dropdown'] = empty( $instance['dropdown'] ) ? 0 : $args['widget_id'];

		if ( $list = pll_the_languages( array_merge( $instance, array( 'echo' => 0 ) ) ) ) {
			$title = empty( $instance['title'] ) ? '' : $instance['title'];
			$title = apply_filters( 'widget_title', $title, $instance, $this->id_base );

			echo $args['before_widget'];
			if ( $title ) {
				echo $args['before_title'] . $title . $args['after_title'];
			}
			echo $instance['dropdown'] ? $list : "<ul>\n" . $list . "</ul>\n";
			echo $args['after_widget'];
		}
	}

	/*
	 * updates the widget options
	 *
	 * @since 0.4
	 *
	 * @param array $new_instance New settings for this instance as input by the user via form()
	 * @param array $old_instance Old settings for this instance
	 * @return array Settings to save or bool false to cancel saving
	 */
	function update( $new_instance, $old_instance ) {
		$instance['title'] = strip_tags( $new_instance['title'] );
		foreach ( array_keys( PLL_Switcher::get_switcher_options( 'widget' ) ) as $key ) {
			$instance[ $key ] = ! empty( $new_instance[ $key ] ) ? 1 : 0;
		}

		return $instance;
	}

	/*
	 * displays the widget form
	 *
	 * @since 0.4
	 *
	 * @param array $instance Current settings
	 */
	function form( $instance ) {
		// default values
		$instance = wp_parse_args( (array) $instance, array_merge( array( 'title' => '' ), PLL_Switcher::get_switcher_options( 'widget', 'default' ) ) );

		// title
		$title = sprintf(
			'<p><label for="%1$s">%2$s</label><input class="widefat" id="%1$s" name="%3$s" type="text" value="%4$s" /></p>',
			$this->get_field_id( 'title' ),
			__( 'Title:', 'polylang' ),
			$this->get_field_name( 'title' ),
			esc_attr( $instance['title'] )
		);

		$fields = '';
		foreach ( PLL_Switcher::get_switcher_options( 'widget' ) as $key => $str ) {
			$fields .= sprintf(
				'<div class = "%5$s" %6$s><input type="checkbox" class="checkbox" id="%1$s" name="%2$s" %3$s/> <label for="%1$s">%4$s</label></div>',
				$this->get_field_id( $key ),
				$this->get_field_name( $key ),
				$instance[ $key ] ? 'checked="checked"' : '',
				esc_html( $str ),
				in_array( $key, array( 'show_names', 'show_flags', 'hide_current' ) ) ? 'no-dropdown-' . $this->id : '',
				! empty( $instance['dropdown'] ) && in_array( $key, array( 'show_names', 'show_flags', 'hide_current' ) ) ? 'style="display:none;"' : ''
			);
		}

		echo $title.'<p>'.$fields.'</p>';

		// FIXME echoing script in form is not very clean
		// but it does not work if enqueued properly :
		// clicking save on a widget makes this code unreachable for the just saved widget ( ?! )
		$this->admin_print_script();
	}

	/*
	 * add javascript to control the language switcher options
	 *
	 * @since 1.3
	 */
	public function admin_print_script() {
		static $js = '';

		if ( $js ) {
			return;
		}

		$js = "
			<script type='text/javascript'>
				//<![CDATA[
				jQuery( document ).ready( function( $ ) {
					function pll_toggle( a, test ) {
						test ? a.show() : a.hide();
					}

					var widgets = new Array();
					$( '.widget-id' ).each( function(){
						var this_id = $( this ).attr( 'value' );

						// remove all options if dropdown is checked
						$( '#widget-'+this_id+'-dropdown' ).change( function() {
							pll_toggle( $( '.no-dropdown-'+this_id ), 'checked' != $( this ).attr( 'checked' ) );
						} );

						// disallow unchecking both show names and show flags
						var options = ['-show_flags', '-show_names'];
						$.each( options, function( i, v ) {
							$( '#widget-'+this_id+v ).change( function() {
								if ( 'checked' != $( this ).attr( 'checked' ) )
									$( '#widget-'+this_id+options[1-i] ).prop( 'checked', true );
							} );
						} );

					} );
				} );
				//]]>
			</script>";

		echo $js;
	}
}
