<?php
/**
 * Objects Factory
 *
 * @package SimpleCalendar
 */
namespace SimpleCalendar;

use SimpleCalendar\Abstracts as SimpleCalObject;

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

/**
 * Objects factory.
 *
 * Helper class to get the right type of object used across the plugin.
 *
 * @since 3.0.0
 */
class Objects
{
	/**
	 * Constructor.
	 *
	 * Add default objects.
	 *
	 * @since 3.0.0
	 */
	public function __construct()
	{
		// Add default feed type.
		add_filter(
			'simcal_get_feed_types',
			function ($feed_types) {
				return array_merge($feed_types, ['google', 'grouped-calendars']);
			},
			10,
			1
		);

		// Add default calendar type.
		add_filter(
			'simcal_get_calendar_types',
			function ($calendar_types) {
				return array_merge($calendar_types, [
					'default-calendar' => ['grid', 'list'],
				]);
			},
			10,
			1
		);

		// Add default admin objects.
		if ($is_admin = is_admin()) {
			add_filter(
				'simcal_get_admin_pages',
				function ($admin_pages) {
					return array_merge($admin_pages, [
						'add-ons' => ['add-ons'],
						'settings' => ['feeds', 'calendars', 'advanced'],
						'tools' => ['system-status'],
					]);
				},
				10,
				1
			);
		}

		do_action('simcal_load_objects', $is_admin);
	}

	/**
	 * Get feed types.
	 *
	 * @since  3.0.0
	 *
	 * @return array
	 */
	public function get_feed_types()
	{
		$array = apply_filters('simcal_get_feed_types', []);
		ksort($array);
		return $array;
	}

	/**
	 * Get calendar types.
	 *
	 * @since  3.0.0
	 *
	 * @return array
	 */
	public function get_calendar_types()
	{
		$array = apply_filters('simcal_get_calendar_types', []);
		ksort($array);
		return $array;
	}

	/**
	 * Get admin pages.
	 *
	 * @since  3.0.0
	 *
	 * @return array
	 */
	public function get_admin_pages()
	{
		return apply_filters('simcal_get_admin_pages', []);
	}

	/**
	 * Get a calendar.
	 *
	 * Returns the right type of calendar.
	 *
	 * @since  3.0.0
	 *
	 * @param  int|string|object|\WP_Post|SimpleCalObject\Calendar $object
	 *
	 * @return null|SimpleCalObject\Calendar
	 */
	public function get_calendar($object)
	{
		if (is_string($object)) {
			return !empty($object) ? $this->get_object($object, 'calendar', '') : null;
		}

		if (is_object($object)) {
			if ($object instanceof SimpleCalObject\Calendar) {
				return $this->get_object($object->type, 'feed', $object);
			} elseif ($object instanceof \WP_Post) {
				if ($type = wp_get_object_terms($object->ID, 'calendar_type')) {
					$name = sanitize_title(current($type)->name);
					return $this->get_object($name, 'calendar', $object);
				}
			} elseif (isset($object->type) && isset($object->id)) {
				return $this->get_object($object->type, 'calendar', $object->id);
			}
		}

		if (is_int($object)) {
			$post = get_post($object);
			if ($post && ($type = wp_get_object_terms($post->ID, 'calendar_type'))) {
				$name = sanitize_title(current($type)->name);
				return $this->get_object($name, 'calendar', $post);
			}
		}

		return null;
	}

	/**
	 * Get a calendar view.
	 *
	 * @since  3.0.0
	 *
	 * @param  int    $id   Feed post id.
	 * @param  string $name (optional) Name of calendar view.
	 *
	 * @return null|SimpleCalObject\Calendar_View
	 */
	public function get_calendar_view($id = 0, $name = '')
	{
		if (!$name && $id > 0) {
			$calendar_view = get_post_meta($id, '_calendar_view', true);

			if ($terms = wp_get_object_terms($id, 'calendar_type')) {
				$calendar_type = sanitize_title(current($terms)->name);
				$name = isset($calendar_view[$calendar_type]) ? $calendar_type . '-' . $calendar_view[$calendar_type] : '';
			}
		}

		return $name ? $this->get_object($name, 'calendar-view', '') : null;
	}

	/**
	 * Get a feed.
	 *
	 * Returns the right type of feed.
	 *
	 * @since  3.0.0
	 *
	 * @param  int|string|object|\WP_Post|SimpleCalObject\Calendar $object
	 *
	 * @return null|SimpleCalObject\Feed
	 */
	public function get_feed($object)
	{
		if (is_string($object)) {
			return !empty($object) ? $this->get_object($object, 'feed', '') : null;
		}

		if (is_object($object)) {
			if ($object instanceof SimpleCalObject\Calendar) {
				$feed_name = '';
				if (empty($object->feed)) {
					if ($feed_type = wp_get_object_terms($object->id, 'feed_type')) {
						$feed_name = sanitize_title(current($feed_type)->name);
					}
				} else {
					$feed_name = $object->feed;
				}
				return $this->get_object($feed_name, 'feed', $object);
			} elseif ($object instanceof \WP_Post) {
				$calendar = $this->get_calendar($object);

				if (isset($calendar->feed)) {
					return $this->get_object($calendar->feed, 'feed', $calendar);
				} else {
					return null;
				}
			} elseif (isset($object->feed) && isset($object->id)) {
				return $this->get_object($object->feed, 'feed', $object);
			}
		}

		if (is_int($object)) {
			$calendar = $this->get_calendar($object);
			return isset($calendar->feed) ? $this->get_object($calendar->feed, 'feed', $calendar) : null;
		}

		return null;
	}

	/**
	 * Get a field.
	 *
	 * @since  3.0.0
	 *
	 * @param  array  $args Field args.
	 * @param  string $name Field type.
	 *
	 * @return null|SimpleCalObject\Field
	 */
	public function get_field($args, $name = '')
	{
		if (empty($name)) {
			$name = isset($args['type']) ? $args['type'] : false;
		}

		return $name ? $this->get_object($name, 'field', $args) : null;
	}

	/**
	 * Get a settings page.
	 *
	 * @since  3.0.0
	 *
	 * @param  string $name
	 *
	 * @return null|SimpleCalObject\Admin_Page
	 */
	public function get_admin_page($name)
	{
		return $name ? $this->get_object($name, 'admin-page') : null;
	}

	/**
	 * Get a plugin object.
	 *
	 * @since  3.0.0
	 * @access private
	 *
	 * @param  string $name Object name.
	 * @param  string $type Object type.
	 * @param  mixed  $args (optional) arguments for the class constructor.
	 *
	 * @return null|Object
	 */
	private function get_object($name, $type, $args = '')
	{
		$types = ['admin-page', 'calendar', 'calendar-view', 'feed', 'field'];

		if (in_array($type, $types)) {
			$class_name = $this->make_class_name($name, $type);
			$parent = '\\' . __NAMESPACE__ . '\Abstracts\\' . implode('_', array_map('ucfirst', explode('-', $type)));
			$class = class_exists($class_name) ? new $class_name($args) : false;

			return $class instanceof $parent ? $class : null;
		}

		return null;
	}

	/**
	 * Make class name from slug.
	 *
	 * Standardizes object naming and class names: <object-name> becomes <Class_Name>.
	 * The plugin autoloader uses a similar pattern.
	 *
	 * @since  3.0.0
	 * @access private
	 *
	 * @param  string $name Object name.
	 * @param  string $type Object type.
	 *
	 * @return string The class name complete with its full namespace.
	 */
	private function make_class_name($name, $type)
	{
		if ('calendar' == $type) {
			$namespace = '\\' . __NAMESPACE__ . '\Calendars\\';
		} elseif ('calendar-view' == $type) {
			$namespace = '\\' . __NAMESPACE__ . '\Calendars\Views\\';
		} elseif ('feed' == $type) {
			$namespace = '\\' . __NAMESPACE__ . '\Feeds\\';
		} elseif ('field' == $type) {
			$namespace = '\\' . __NAMESPACE__ . '\Admin\Fields\\';
		} elseif ('admin-page' == $type) {
			$namespace = '\\' . __NAMESPACE__ . '\Admin\Pages\\';
		} else {
			return '';
		}

		$class_name = implode('_', array_map('ucfirst', explode('-', $name)));

		return $namespace . $class_name;
	}
}