<?php

/**
 * Ai1ec_Agenda_Widget class
 *
 * A widget that displays the next X upcoming events (similar to Agenda view).
 */
class Ai1ec_Agenda_Widget extends WP_Widget
{
	/**
	 * _construct function
	 *
	 * Constructor for widget.
	 */
	function __construct() {
		parent::__construct(
			'ai1ec_agenda_widget',
			__( 'Upcoming Events', AI1EC_PLUGIN_NAME ),
			array(
				'description' => __( 'All-in-One Event Calendar: Lists upcoming events in Agenda view', AI1EC_PLUGIN_NAME ),
				'class' => 'ai1ec-agenda-widget',
			)
		);
	}

	/**
	 * form function
	 *
	 * Renders the widget's configuration form for the Manage Widgets page.
	 *
	 * @param array $instance The data array for the widget instance being
	 *                        configured.
	 */
	function form( $instance )
	{
		global $ai1ec_view_helper;

		$default = array(
			'title'                  => __( 'Upcoming Events', AI1EC_PLUGIN_NAME ),
			'events_per_page'        => 10,
			'show_subscribe_buttons' => true,
			'show_calendar_button'   => true,
			'hide_on_calendar_page'  => true,
			'limit_by_cat'           => false,
			'limit_by_tag'           => false,
			'limit_by_post'          => false,
			'event_cat_ids'          => array(),
			'event_tag_ids'          => array(),
			'event_post_ids'         => array(),
		);
		$instance = wp_parse_args( (array) $instance, $default );

		// Get available cats, tags, events to allow user to limit widget to certain categories
		$events_categories = get_terms( 'events_categories', array( 'orderby' => 'name', "hide_empty" => false ) );
		$events_tags       = get_terms( 'events_tags', array( 'orderby' => 'name', "hide_empty" => false ) );
	    $get_events        = new WP_Query( array ( 'post_type' => AI1EC_POST_TYPE, 'posts_per_page' => -1 ) );
	    $events_options    = $get_events->posts;

		// Generate unique IDs and NAMEs of all needed form fields
		$fields = array(
			'title'                  => array('value'   => $instance['title']),
			'events_per_page'        => array('value'   => $instance['events_per_page']),
			'show_subscribe_buttons' => array('value'   => $instance['show_subscribe_buttons']),
			'show_calendar_button'   => array('value'   => $instance['show_calendar_button']),
			'hide_on_calendar_page'  => array('value'   => $instance['hide_on_calendar_page']),
			'limit_by_cat'           => array('value'   => $instance['limit_by_cat']),
			'limit_by_tag'           => array('value'   => $instance['limit_by_tag']),
			'limit_by_post'          => array('value'   => $instance['limit_by_post']),
			'event_cat_ids'          => array(
			                                  'value'   => (array)$instance['event_cat_ids'],
			                                  'options' => $events_categories
			                                 ),
			'event_tag_ids'          => array(
			                                  'value'   => (array)$instance['event_tag_ids'],
			                                  'options' => $events_tags
			                                 ),
			'event_post_ids'         => array(
			                                  'value'   => (array)$instance['event_post_ids'],
			                                  'options' => $events_options
			                                 ),
		);
		foreach( $fields as $field => $data ) {
			$fields[$field]['id']    = $this->get_field_id( $field );
			$fields[$field]['name']  = $this->get_field_name( $field );
			$fields[$field]['value'] = $data['value'];
			if( isset($data['options']) ) {
				$fields[$field]['options'] = $data['options'];
			}
		}

		$ai1ec_view_helper->display( 'agenda-widget-form.php', $fields );
	}

	/**
	 * update function
	 *
	 * Called when a user submits the widget configuration form. The data should
	 * be validated and returned.
	 *
	 * @param array $new_instance The new data that was submitted.
	 * @param array $old_instance The widget's old data.
	 * @return array The new data to save for this widget instance.
	 */
	function update( $new_instance, $old_instance )
	{
		// Save existing data as a base to modify with new data
		$instance = $old_instance;
		$instance['title']                  = strip_tags( $new_instance['title'] );
		$instance['events_per_page']        = intval( $new_instance['events_per_page'] );
		if( $instance['events_per_page'] < 1 ) $instance['events_per_page'] = 1;
		$instance['show_subscribe_buttons'] = $new_instance['show_subscribe_buttons'] ? true : false;
		$instance['show_calendar_button']   = $new_instance['show_calendar_button'] ? true : false;
		$instance['hide_on_calendar_page']  = $new_instance['hide_on_calendar_page'] ? true : false;
		// For limits, set the limit to False if no IDs were selected, or set the respective IDs to empty if "limit by" was unchecked
		$instance['limit_by_cat']           = ( ! $new_instance['event_cat_ids'] || ! $new_instance['limit_by_cat'] ) ? false : true;
		$instance['event_cat_ids']          = ! $new_instance['limit_by_cat'] ? array() : $new_instance['event_cat_ids'] ;
		$instance['limit_by_tag']           = ( ! $new_instance['event_tag_ids'] || ! $new_instance['limit_by_tag'] ) ? false : true;
		$instance['event_tag_ids']          = ! $new_instance['limit_by_tag'] ? array() : $new_instance['event_tag_ids'] ;
		$instance['limit_by_post']         = ( ! $new_instance['event_post_ids'] || ! $new_instance['limit_by_post'] ) ? false : true;
		$instance['event_post_ids']         = ! $new_instance['limit_by_post'] ? array() : $new_instance['event_post_ids'] ;

		return $instance;
	}

	/**
	 * widget function
	 *
	 * Outputs the given instance of the widget to the front-end.
	 *
	 * @param array $args Display arguments passed to the widget
	 * @param array $instance The settings for this widget instance
	 */
	function widget( $args, $instance )
	{
		global $ai1ec_view_helper,
		       $ai1ec_events_helper,
		       $ai1ec_calendar_helper,
		       $ai1ec_settings;
		
		$defaults = array(
			'hide_on_calendar_page'  => true,
			'event_cat_ids'          => array(),
			'event_tag_ids'          => array(),
			'event_post_ids'         => array(),
			'events_per_page'        => 10,
		);
		$instance = wp_parse_args( $instance, $defaults );

		if( $instance['hide_on_calendar_page'] &&
		    is_page( $ai1ec_settings->calendar_page_id ) )
			return;

		// Add params to the subscribe_url for filtering by Limits (category, tag)
		$subscribe_filter  = '';
		$subscribe_filter .= $instance['event_cat_ids'] ? '&ai1ec_cat_ids=' . join( ',', $instance['event_cat_ids'] ) : '';
		$subscribe_filter .= $instance['event_tag_ids'] ? '&ai1ec_tag_ids=' . join( ',', $instance['event_tag_ids'] ) : '';
		$subscribe_filter .= $instance['event_post_ids'] ? '&ai1ec_post_ids=' . join( ',', $instance['event_post_ids'] ) : '';

		// Get localized time
		$timestamp = $ai1ec_events_helper->gmt_to_local( time() );

		// Set $limit to the specified category/tag
		$limit = array( 
		                "cat_ids"   => $instance['event_cat_ids'],
		                "tag_ids"   => $instance['event_tag_ids'],
		                "post_ids" => $instance['event_post_ids'],
		              );

		// Get events, then classify into date array
		$event_results = $ai1ec_calendar_helper->get_events_relative_to(
			$timestamp, $instance['events_per_page'], 0, $limit );
		$dates = $ai1ec_calendar_helper->get_agenda_date_array( $event_results['events'] );

		$args['title']                  = $instance['title'];
		$args['show_subscribe_buttons'] = $instance['show_subscribe_buttons'];
		$args['show_calendar_button']   = $instance['show_calendar_button'];
		$args['dates']                  = $dates;
		$args['calendar_url']           = $ai1ec_calendar_helper->get_calendar_url( null, $instance['event_cat_ids'], $instance['event_tag_ids'] );
		$args['subscribe_url']          = AI1EC_EXPORT_URL . $subscribe_filter;

		$ai1ec_view_helper->display( 'agenda-widget.php', $args );
	}
}