<?php
/**
 * Meta Boxes
 *
 * @package SimpleCalendar/Admin
 */
namespace SimpleCalendar\Admin;

use SimpleCalendar\Admin\Metaboxes as Metabox;

if (!defined('ABSPATH')) {
	exit();
}

/**
 * Meta boxes class.
 *
 * Handles write panels in post types and post meta.
 *
 * @since 3.0.0
 */
class Meta_Boxes
{
	/**
	 * Saved meta boxes status.
	 *
	 * @access private
	 * @var bool
	 */
	private static $saved_meta_boxes = false;

	/**
	 * Post types to attach calendars.
	 *
	 * @access private
	 * @var array
	 */
	private $post_types = [];

	/**
	 * Hook in tabs.
	 *
	 * @since 3.0.0
	 */
	public function __construct()
	{
		$settings = get_option('simple-calendar_settings_calendars');
		if (isset($settings['general']['attach_calendars_posts'])) {
			$this->post_types = $settings['general']['attach_calendars_posts'];
		}

		// Load meta boxes to save settings.
		new Metabox\Settings();
		new Metabox\Attach_Calendar();
		new Metabox\Upgrade_To_Premium();
		//new Metabox\Newsletter();

		do_action('simcal_load_meta_boxes');

		// Add meta boxes.
		add_action('add_meta_boxes', [$this, 'add_meta_boxes'], 30);

		// Process meta boxes.
		add_action('simcal_save_settings_meta', '\SimpleCalendar\Admin\Metaboxes\Settings::save', 10, 2);
		add_action('simcal_save_attach_calendar_meta', '\SimpleCalendar\Admin\Metaboxes\Attach_Calendar::save', 10, 2);

		// Save meta boxes data.
		add_action('save_post', [$this, 'save_meta_boxes'], 1, 2);

		// Uncomment this for debugging $_POST while saving a meta box.
		// add_action( 'save_post', function() { echo '<pre>'; print_r( $_POST ); echo '</pre>'; die(); } );
	}

	/**
	 * Add meta boxes.
	 *
	 * @since 3.0.0
	 */
	public function add_meta_boxes()
	{
		add_meta_box(
			'simcal-calendar-settings',
			__('Calendar Settings', 'google-calendar-events'),
			'\SimpleCalendar\Admin\Metaboxes\Settings::html',
			'calendar',
			'normal',
			'core'
		);

		$addons = apply_filters('simcal_installed_addons', []);
		if (empty($addons)) {
			// Premium add-on feature list and upsell.
			add_meta_box(
				'simcal-upgrade',
				__('Looking for more?', 'google-calendar-events'),
				'\SimpleCalendar\Admin\Metaboxes\Upgrade_To_Premium::html',
				'calendar',
				'side',
				'default'
			);

			// Removing coupon code + mailing list sign-up for now. 9/26/16
			/*
			add_meta_box(
				'simcal-newsletter',
				__( 'Get 20% off all Pro Add-ons', 'google-calendar-events' ),
				'\SimpleCalendar\Admin\Metaboxes\Newsletter::html',
				'calendar',
				'side',
				'default'
			);
			*/
		}

		add_meta_box(
			'simcal-get-shortcode',
			__('Calendar Shortcode', 'google-calendar-events'),
			'\SimpleCalendar\Admin\Metaboxes\Get_Shortcode::html',
			'calendar',
			'side',
			'default'
		);

		// Add meta box if there are calendars.
		if (true == simcal_get_calendars() && !empty($this->post_types)) {
			foreach ($this->post_types as $post_type) {
				add_meta_box(
					'simcal-attach-calendar',
					__('Attach Calendar', 'google-calendar-events'),
					'\SimpleCalendar\Admin\Metaboxes\Attach_Calendar::html',
					$post_type,
					'side',
					'low'
				);
			}
		}

		do_action('simcal_add_meta_boxes');
	}

	/**
	 * Check if we're saving, then trigger action.
	 *
	 * @since  3.0.0
	 *
	 * @param  int    $post_id
	 * @param  object $post
	 *
	 * @return void
	 */
	public function save_meta_boxes($post_id, $post)
	{
		// $post_id and $post are required.
		if (empty($post_id) || empty($post) || self::$saved_meta_boxes) {
			return;
		}

		// Don't save meta boxes for revisions or autosaves.
		if (defined('DOING_AUTOSAVE') || is_int(wp_is_post_revision($post)) || is_int(wp_is_post_autosave($post))) {
			return;
		}

		// Check the nonce.
		if (empty($_POST['simcal_meta_nonce']) || !wp_verify_nonce($_POST['simcal_meta_nonce'], 'simcal_save_data')) {
			return;
		}

		// Check the post being saved == the $post_id to prevent triggering this call for other save_post events.
		if (empty($_POST['post_ID']) || $_POST['post_ID'] != $post_id) {
			return;
		}

		// Check user has permission to edit
		if (!current_user_can('edit_post', $post_id)) {
			return;
		}

		// We need this save event to run once to avoid potential endless loops.
		// This would have been perfect:
		// `remove_action( current_filter(), __METHOD__ );`
		// But cannot be used due to a WordPress bug:
		// @link https://core.trac.wordpress.org/ticket/17817
		// @see also https://github.com/woothemes/woocommerce/issues/6485
		self::$saved_meta_boxes = true;

		// Check the post type.
		if ('calendar' == $post->post_type) {
			do_action('simcal_save_settings_meta', $post_id, $post);
		} elseif (in_array($post->post_type, $this->post_types)) {
			do_action('simcal_save_attach_calendar_meta', $post_id, $post);
		}

		do_action('simcal_save_meta_boxes', $post_id, $post);
	}
}
