Inventory_Presser_Slider

class Inventory_Presser_Slider extends WP_Widget {

	const ID_BASE = '_invp_slick';

	var $text_displays = array(
		'none'   => 'None',
		'top'    => 'Top',
		'bottom' => 'Bottom'
	);

	/**
	 * __construct
	 *
	 * Calls the parent class' contructor and adds a hook that will delete the
	 * option that stores this widget's data when the plugin's delete all data
	 * method is run.
	 * 
	 * @return void
	 */
	function __construct() {
		parent::__construct(
			self::ID_BASE,
			__( 'Vehicle Slider', 'inventory-presser' ),
			array( 'description' => __( 'A slideshow for all vehicles with at least one photo.', 'inventory-presser' ), )
		);

		add_action( 'invp_delete_all_data', array( $this, 'delete_option' ) );
	}

	/**
	 * delete_option
	 * 
	 * Deletes the option that stores this widget's data.
	 *
	 * @return void
	 */
	public function delete_option() {
		delete_option( 'widget_' . self::ID_BASE );
	}

		
	/**
	 * featured_select_options
	 * 
	 * Creates an array of criteria options that powers the widget.
	 *
	 * @return array
	 */
	function featured_select_options() {
		return array(
			'featured_priority' => __( 'Priority for Featured Vehicles', 'inventory-presser' ),
			'featured_only'     => __( 'Featured Vehicles Only', 'inventory-presser' ),
			'random'            => __( 'Random', 'inventory-presser' ),
			'newest_first'      => __( 'Newest Vehicles First', 'inventory-presser' ),
		);
	}
	
	/**
	 * include_scripts
	 * 
	 * Enqueues stylesheets and JavaScripts
	 *
	 * @return void
	 */
	function include_scripts( $instance )
	{
		//Need flexslider scripts and styles
		wp_enqueue_style( 'flexslider' );
		wp_enqueue_style( 'invp-flexslider' );
		wp_enqueue_style( 'invp-slider' );

		//Spin-up script
		wp_enqueue_script( 'invp-slider' );
		//Provide one of the widget settings to JavaScript
		wp_add_inline_script( 'invp-slider', 'const widget_slider = ' . json_encode( array(
			'showcount' => $instance['showcount'],
		) ), 'before' );

	}

	/**
	 * widget
	 * 
	 * Outputs the widget front-end HTML
	 *
	 * @param  array $args
	 * @param  array $instance
	 * @return void
	 */
	public function widget( $args, $instance )
	{
		$this->include_scripts( $instance );

		$title = empty( $instance['title'] ) ? '' : apply_filters( 'widget_title', $instance['title'] );
		$showcount = empty( $instance['showcount'] ) ? 3 : $instance['showcount'];
		$showtext = isset( $instance['showtext'] ) ? $instance['showtext'] : false;
		$featured_select_slugs = array_keys( $this->featured_select_options() );
		$featured_select = isset($instance['featured_select']) ? $instance[ 'featured_select' ] : $featured_select_slugs[0];
		$showtitle = (isset($instance['cb_showtitle']) && $instance['cb_showtitle'] == 'true');
		$showprice = (isset($instance['cb_showprice']) && $instance['cb_showprice'] == 'true');

		$inventory_ids = array();

		$get_posts_args = array(
			'fields'         => 'ids',
			'meta_query'     => array(
				array(
					'key'     => '_thumbnail_id',
					'compare' => 'EXISTS',
				),
			),
			'order'          => 'ASC',
			'orderby'        => 'rand',
			'post_type'      => INVP::POST_TYPE,
			'posts_per_page' => $showcount * 5, //get 5 sets of the number we'll show at one time
		);

		switch( $featured_select ) {

			case 'random':
				$get_posts_args['meta_key'] = '_thumbnail_id';
				$inventory_ids = get_posts( apply_filters( 'invp_slider_widget_query_args', $get_posts_args ) );
				break;

			case 'newest_first':
				$get_posts_args['meta_key'] = apply_filters( 'invp_prefix_meta_key', 'last_modified' );
				$get_posts_args['orderby'] = ' STR_TO_DATE( meta1.meta_value, \'%a, %d %b %Y %T\' ) ';
				$get_posts_args['order']   = 'DESC';
				$inventory_ids = get_posts( apply_filters( 'invp_slider_widget_query_args', $get_posts_args ) );
				break;

			//featured_only
			//featured_priority
			default:
				$get_posts_args['meta_query'][] = array(
					'key'     => apply_filters( 'invp_prefix_meta_key', 'featured' ),
					'value'   => 1,
				);
				$inventory_ids = get_posts( apply_filters( 'invp_slider_widget_query_args', $get_posts_args ) );

				if (count($inventory_ids) < ($showcount * 5) && $featured_select == 'featured_priority')
				{
					//Get enough non-featured vehicles to fill out the number we need
					$get_posts_args['posts_per_page'] = ($showcount * 5) - (count($inventory_ids));
					if( ! empty( $inventory_ids ) ) 
					{
						$get_posts_args['exclude'] = $inventory_ids;
					}
					$get_posts_args['meta_query'] = array(
						array(
							'key'	  => '_thumbnail_id',
							'compare' => 'EXISTS',
						)
					);

					$second_pass = get_posts( apply_filters( 'invp_slider_widget_query_args', $get_posts_args ) );
					$inventory_ids += $second_pass;
				}
				//randomize the order, a strange choice we'll maintain
				shuffle( $inventory_ids );

				break;
		}

		if ( ! $inventory_ids ) {
			//No vehicles to show, don't output anything
			return;
		}

		// before and after widget arguments are defined by themes
		echo $args['before_widget'];
		if ( ! empty( $title ) ) {
			echo $args['before_title'] . $title . $args['after_title'];
		}
		echo '<div id="slider-width"></div><div id="slider" class="flexslider"><ul class="slides">';

		foreach ($inventory_ids as $inventory_id)
		{
			printf(
				'<li style="position: relative"><a href="%s">%s',
				get_the_permalink( $inventory_id ),
				get_the_post_thumbnail( $inventory_id, 'large' )
			);
			if ($showtext != 'none') {
				printf( '<div class="flex-caption flex-caption-%s">', $showtext );
				if ($showtitle) {
					printf( '<h3>%s %s %s</h3>', invp_get_the_year( $inventory_id ), invp_get_the_make( $inventory_id ), invp_get_the_model( $inventory_id ) );
				}
				if ($showprice) {
					printf( '<h2>%s</h2>', invp_get_the_price( '', $inventory_id ) );
				}
				echo '</div>';
			}
			echo '</a></li>';
		}
		echo '</ul></div>' . $args['after_widget'];
	}

	/**
	 * form
	 * 
	 * Outputs the widget settings form that is shown in the dashboard.
	 *
	 * @param  array $instance
	 * @return void
	 */
	public function form( $instance ) {

		$title = isset($instance[ 'title' ]) ? $instance[ 'title' ] : '';
		$showcount = isset($instance[ 'showcount' ]) ? $instance[ 'showcount' ] : 3;

		$featured_select_slugs = array_keys( $this->featured_select_options() );
		$featured_select = isset($instance['featured_select']) ? $instance[ 'featured_select' ] : $featured_select_slugs[0];

		$text_displays_slugs = array_keys($this->text_displays);
		$showtext = isset($instance['showtext']) ? $instance[ 'showtext' ] : $text_displays_slugs[0]; //"none"

		// Widget admin form
		?>
		<p>
		<label for="<?php echo $this->get_field_id( 'title' ); ?>"><?php _e( 'Title:', 'inventory-presser' ); ?></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( 'showcount' ); ?>"><?php _e( 'Vehicles to show at one time:', 'inventory-presser' ); ?></label>
		<select class="widefat" id="<?php echo $this->get_field_id('showcount'); ?>" name="<?php echo $this->get_field_name('showcount'); ?>">
		<?php
			for ( $i=1; $i < 8; $i++ ) {
				printf(
					'<option value="%1$d"%2$s>%1$d</option>',
					$i,
					selected( $i == $showcount, true, false )
				);
			}
		?>
		</select>
		</p>

		<p>
		<label for="<?php echo $this->get_field_id( 'featured_select' ); ?>"><?php _e( 'Vehicle Selection:', 'inventory-presser' ); ?></label>
		<select class="widefat" id="<?php echo $this->get_field_id('featured_select'); ?>" name="<?php echo $this->get_field_name('featured_select'); ?>">
		<?php
			foreach ( $this->featured_select_options() as $slug => $label ) {
				printf(
					'<option value="%s"%s>%s</option>',
					$slug,
					selected( true, $slug == $featured_select, false ),
					$label
				);
			}
		?>
		</select>
		</p>

		<p>
		<label for="<?php echo $this->get_field_id( 'showtext' ); ?>"><?php _e( 'Text Overlay:', 'inventory-presser' ); ?></label>
		<select class="widefat" id="<?php echo $this->get_field_id('showtext'); ?>" name="<?php echo $this->get_field_name('showtext'); ?>">
		<?php
			foreach ( $this->text_displays as $slug => $label ) {
				printf(
					'<option value="%s"%s>%s</option>',
					$slug,
					selected( $slug == $showtext, true, false ),
					$label
				);
			}
		?>
		</select>
		</p><?php

			/**
			 * This inline JavaScript disables two checkboxes depending on the
			 * value of the Text Overlay dropdown above. Some trickery is 
			 * involved, because the readonly attribute only locks an inputs
			 * value and a checkbox being checked isn't the value, it's the
			 * state. A click handler is added and removed to prevent state
			 * changes to the two checkboxes if Text Overlay is set to None.
			 */

		?><script type="text/javascript">
		<!--
			function __return_false(){ return false; }
			jQuery(document).ready(function(){
				var sel = jQuery('#<?php echo $this->get_field_id( 'showtext' ); ?>');
				sel.on('change', function(){
					var chks =jQuery('#<?php echo $this->get_field_id('cb_showtitle'); ?>,#<?php echo $this->get_field_id('cb_showprice'); ?>');
					chks.attr('readonly', ('none'==sel.val()));			
					if('none'==sel.val())
					{
						chks.on('click',__return_false);
					}
					else
					{
						chks.off('click', __return_false);
					}
				});
			});
		//-->
		</script>
		<p>
		<label for="<?php echo $this->get_field_id('cb_showtitle'); ?>"><input type="checkbox" id="<?php echo $this->get_field_id('cb_showtitle'); ?>" name="<?php echo $this->get_field_name('cb_showtitle'); ?>" value="true"<?php checked( true, ( isset( $instance['cb_showtitle'] ) && $instance['cb_showtitle'] == 'true' ) ); ?>> <?php _e( 'Overlay year, make, & model', 'inventory-presser' ); ?></label>
		</p>
		<p>
		<label for="<?php echo $this->get_field_id('cb_showprice'); ?>"><input type="checkbox" id="<?php echo $this->get_field_id('cb_showprice'); ?>" name="<?php echo $this->get_field_name('cb_showprice'); ?>" value="true"<?php checked( true, ( isset( $instance['cb_showprice'] ) && $instance['cb_showprice'] == 'true' ) ); ?>> <?php _e( 'Overlay price', 'inventory-presser' ); ?></label>
		</p>

		<?php
	}

	/**
	 * update
	 *
	 * Saves the widget settings when a dashboard user clicks the Save button.
	 * 
	 * @param  array $new_instance
	 * @param  array $old_instance
	 * @return array The updated array full of settings
	 */
	public function update( $new_instance, $old_instance ) {
		$instance = array();
		$instance['title'] = ( ! empty( $new_instance['title'] ) ) ? strip_tags( $new_instance['title'] ) : '';
		$instance['showcount'] = ( ! empty( $new_instance['showcount'] ) ) ? strip_tags( $new_instance['showcount'] ) : 3;
		$instance['featured_select'] = ( ! empty( $new_instance['featured_select'] ) ) ? strip_tags( $new_instance['featured_select'] ) : '';
		$instance['showtext'] = ( ! empty( $new_instance['showtext'] ) ) ? strip_tags( $new_instance['showtext'] ) : '';
		$instance['cb_showtitle'] = ( !empty( $new_instance['cb_showtitle'] ) ) ? $new_instance['cb_showtitle'] : '';
		$instance['cb_showprice'] = ( !empty( $new_instance['cb_showprice'] ) ) ? $new_instance['cb_showprice'] : '';
		return $instance;
	}
}