<?php
/**
 * Controller that handles javascript related functions.
 *
 * @author     Time.ly Network Inc.
 * @since      2.0
 *
 * @package    AI1EC
 * @subpackage AI1EC.Controller
 */
class Ai1ec_Javascript_Controller {

	// The js handle used when enqueueing
	const JS_HANDLE = 'ai1ec_requirejs';

	// The namespace for require.js functions
	const REQUIRE_NAMESPACE = 'timely';

	// the name of the configuration module for the frontend
	const FRONTEND_CONFIG_MODULE = 'ai1ec_calendar';

	//the name of the get parameter we use for loading js
	const LOAD_JS_PARAMETER = 'ai1ec_render_js';

	// just load backend scripts
	const LOAD_ONLY_BACKEND_SCRIPTS = 'common_backend';

	// just load backend scripts
	const LOAD_ONLY_FRONTEND_SCRIPTS = 'common_frontend';

	// Are we in the backend
	const IS_BACKEND_PARAMETER = 'is_backend';

	// Are we on the calendar page
	const IS_CALENDAR_PAGE = 'is_calendar_page';

	// this is the value of IS_BACKEND_PARAMETER which triggers loading of backend script
	const TRUE_PARAM = 'true';

	// the javascript file for event page
	const EVENT_PAGE_JS = 'event.js';

	// the javascript file for calendar page
	const CALENDAR_PAGE_JS = 'calendar.js';

	// the file for the calendar feedsa page
	const CALENDAR_FEEDS_PAGE = 'calendar_feeds.js';

	// add new event page js
	const ADD_NEW_EVENT_PAGE = 'add_new_event.js';

	// event category page js
	const EVENT_CATEGORY_PAGE = 'event_category.js';

	// less variable editing page
	const LESS_VARIBALES_PAGE = 'less_variables_editing.js';

	// settings page
	const SETTINGS_PAGE = 'admin_settings.js';

	//widget creator page
	const WIDGET_CREATOR = 'widget-creator.js';

	//ticketing page
	const TICKETING = 'ticketing.js';

	//cache file
	const CALENDAR_JS_CACHE_FILE = '/public/js_cache/calendar.js';

	/**
	 * @var Ai1ec_Registry_Object
	 */
	private $_registry;

	/**
	 * The core js pages to load.
	 * Used to avoid errors when extensions add pages.
	 *
	 * @var array
	 */
	private $_core_pages = array(
		self::CALENDAR_FEEDS_PAGE => true,
		self::ADD_NEW_EVENT_PAGE  => true,
		self::EVENT_CATEGORY_PAGE => true,
		self::LESS_VARIBALES_PAGE => true,
		self::SETTINGS_PAGE       => true,
		self::EVENT_PAGE_JS       => true,
		self::CALENDAR_PAGE_JS    => true,
		self::WIDGET_CREATOR      => true,
		self::TICKETING           => true,
	);

	/**
	 * Holds an instance of the settings object
	 *
	 * @var Ai1ec_Settings
	 */
	private $_settings;

	/**
	 * @var Ai1ec_Locale
	 */
	private $_locale;

	/**
	 * @var Ai1ec_Scripts
	 */
	private $_scripts_helper;

	/**
	 * @var Ai1ec_Acl_Aco
	 */
	private $_aco;

	/**
	 * @var Ai1ec_Template_Link_Helper
	 */
	private $_template_link_helper;

	/**
	 * @var bool
	 */
	protected $_frontend_scripts_loaded = false;

	/**
	 * Public constructor.
	 *
	 * @param Ai1ec_Registry_Object $registry
	 *
	 * @return void
	 */
	public function __construct( Ai1ec_Registry_Object $registry ) {
		$this->_registry             = $registry;
		$this->_settings             = $registry->get( 'model.settings' );
		$this->_locale               = $registry->get( 'p28n.wpml' );
		$this->_aco                  = $registry->get( 'acl.aco' );
		$this->_template_link_helper = $registry->get( 'template.link.helper' );
		// this will need to be modified
		$this->_scripts_helper       = $registry->get( 'script.helper' );
	}

	/**
	 * Load javascript files for frontend pages.
	 *
	 * @wp-hook ai1ec_load_frontend_js
	 *
	 * @param $is_calendar_page boolean Whether we are displaying the main
	 *                                  calendar page or not
	 *
	 * @return void
	 */
	public function load_frontend_js( $is_calendar_page, $is_shortcode = false ) {
		$page = null;

		// ======
		// = JS =
		// ======
		if( $this->_are_we_accessing_the_single_event_page() === true ) {
			$page = self::EVENT_PAGE_JS;
		}
		if( $is_calendar_page === true ) {
			$page = self::CALENDAR_PAGE_JS;
		}
		if( null !== $page ) {
			$this->add_link_to_render_js( $page, false );
		}
	}

	/**
	 * Render the javascript for the appropriate page.
	 *
	 * @return void
	 */
	public function render_js() {
		$js_path   = AI1EC_ADMIN_THEME_JS_PATH . DIRECTORY_SEPARATOR;
		$common_js = '';
		$js_cache  = $this->_settings->get( 'cache_dynamic_js' );

		if ( ! isset( $_GET[self::LOAD_JS_PARAMETER] ) ) {
			return null;
		}
		$page_to_load = $_GET[self::LOAD_JS_PARAMETER];
		$scripts_updated = $this->_registry->get( 'model.option' )->get( 'calendarjsupdated' );
	
		if (
			$js_cache &&
			$page_to_load === self::CALENDAR_PAGE_JS && 
			'1' === $scripts_updated &&
			$this->_registry->get( 'filesystem.checker' )->check_file_exists(
				AI1EC_PATH . self::CALENDAR_JS_CACHE_FILE,
				true
			)
		) {	
			Ai1ec_Http_Response_Helper::stop( 0 );
			return;	
		}

		if (
			isset( $_GET[self::IS_BACKEND_PARAMETER] ) &&
			$_GET[self::IS_BACKEND_PARAMETER] === self::TRUE_PARAM
		) {
			$common_js = file_get_contents( $js_path . 'pages/common_backend.js' );
		} else if (
			$page_to_load === self::EVENT_PAGE_JS ||
			$page_to_load === self::CALENDAR_PAGE_JS ||
			$page_to_load === self::LOAD_ONLY_FRONTEND_SCRIPTS
		) {
			if (
				$page_to_load === self::LOAD_ONLY_FRONTEND_SCRIPTS &&
				true === $this->_frontend_scripts_loaded
			) {
				return;
			}
			if ( false === $this->_frontend_scripts_loaded ) {
				$common_js = file_get_contents(
					$js_path . 'pages/common_frontend.js'
				);
				$this->_frontend_scripts_loaded = true;
			}
		}

		// Create the config object for Require.js.
		$require_config = $this->create_require_js_config_object();

		// Load Require.js script.
		$require = file_get_contents( $js_path . 'require.js' );

		// Load appropriate jQuery script based on browser.
		$jquery = $this->get_jquery_version_based_on_browser(
			isset( $_SERVER['HTTP_USER_AGENT'] )
				? $_SERVER['HTTP_USER_AGENT']
				: ''
		);

		// Load the main script for the page.
		$page_js = '';
		if ( isset( $this->_core_pages[$page_to_load] ) ) {
			$page_js = file_get_contents( $js_path . 'pages/' . $page_to_load );
		}

		// Load translation module.
		$translation    = $this->get_frontend_translation_data();
		$permalink      = $this->_template_link_helper
			->get_permalink( $this->_settings->get( 'calendar_page_id' ) );
		$full_permalink = $this->_template_link_helper
			->get_full_permalink( $this->_settings->get( 'calendar_page_id' ) );
		$translation['calendar_url']      = $permalink;
		$translation['full_calendar_url'] = $full_permalink;
		$translation_module = $this->create_require_js_module(
			self::FRONTEND_CONFIG_MODULE,
			$translation
		);

		// Load Ai1ec config script.
		$config = $this->create_require_js_module(
			'ai1ec_config',
			$this->get_translation_data()
		);

		// Let extensions add their scripts.
		$extension_files = array();
		$extension_files = apply_filters(
			'ai1ec_render_js',
			$extension_files,
			$page_to_load
		);
		$ext_js = '';

		foreach ( $extension_files as $file ) {
			$ext_js .= file_get_contents( $file );
		}

		// Finally, load the page_ready script to execute code that must run after
		// all scripts have been loaded.
		$page_ready = file_get_contents(
			$js_path . 'scripts/common_scripts/page_ready.js'
		);

		$javascript = $require . $require_config . $translation_module .
			$config . $jquery . $common_js . $ext_js . $page_js . $page_ready;
		// add to blank spaces to fix issues with js
		// being truncated onn some installs
		$javascript .= '  ';

		if (
			$js_cache &&
			$page_to_load === self::CALENDAR_PAGE_JS &&
			(
				'0' === $scripts_updated ||
				! $this->_registry->get( 'filesystem.checker' )->check_file_exists(
					AI1EC_PATH . self::CALENDAR_JS_CACHE_FILE,
					true
				)
			)
		) {
			$js_saved = false;
			try {
				$js_saved = file_put_contents(
					$js_path . '../js_cache/' . self::CALENDAR_PAGE_JS,
					$javascript
				);
				if ( $js_saved ) {
					$this->_registry->get( 'model.option' )->set( 'calendarjsupdated', '1' );
				}
			} catch ( Exception $e ) {
				$this->_settings->set( 'cache_dynamic_js', false );
			}
		}
		
		$this->_echo_javascript( $javascript );
	}


	/**
	 * Sets the flag to revalidate cached js files on next render.
	 */
	public function revalidate_cache() {
		$this->_registry->get( 'model.option' )->set( 'calendarjsupdated', '0' );
	}

	/**
	 * Get a compiled javascript file ( used by extensions )
	 *
	 * @param string $name
	 *
	 * @return string
	 */
	public function get_module( $name ) {
		$js_path = AI1EC_ADMIN_THEME_JS_PATH . DIRECTORY_SEPARATOR;
		return file_get_contents( $js_path . $name );
	}

	/**
	 * Check what file needs to be loaded and add the correct link.
	 *
	 * @wp-hook init
	 *
	 * @return void
	 */
	public function load_admin_js() {
		// Initialize dashboard view

		$script_to_load = FALSE;
		if ( $this->are_we_on_calendar_feeds_page() === TRUE ) {
			// Load script for the importer plugins
			$script_to_load[] = self::CALENDAR_FEEDS_PAGE;
		}
		// Start the scripts for the event category page
		if ( $this->_are_we_editing_event_categories() === TRUE ) {
			// Load script required when editing categories
			$script_to_load[] = self::EVENT_CATEGORY_PAGE;
		}
		if ( $this->_are_we_editing_less_variables() === TRUE ) {
			// Load script required when editing categories
			$script_to_load[] = self::LESS_VARIBALES_PAGE;
		}
		// Load the js needed when you edit an event / add a new event
		if (
			true === $this->_are_we_creating_a_new_event() ||
			true === $this->_are_we_editing_an_event()
		) {
			// Load script for adding / modifying events
			$script_to_load[] = self::ADD_NEW_EVENT_PAGE;
		}
		if ( $this->_are_we_accessing_the_calendar_settings_page() === TRUE ) {
			$script_to_load[] = self::SETTINGS_PAGE;
		}
		if ( true === $this->_are_we_creating_widgets() ) {
			$script_to_load[] = self::WIDGET_CREATOR;
		}
		
		if ( ( $this->_registry->get( 'helper.api-settings' )->ai1ec_api_enabled() ) && (
				true === $this->_are_we_managing_tickets() ||
				true === $this->_are_we_managing_events_list()
			)
		) {
			$script_to_load[] = self::TICKETING;
		}
		if ( false === $script_to_load ) {
			$script_to_load[] = apply_filters( 'ai1ec_backend_js', self::LOAD_ONLY_BACKEND_SCRIPTS );
		}
		foreach ($script_to_load as $value) {
			$this->add_link_to_render_js( $value, true );
		}		
	}

	/**
	 * Loads version 1.9 or 2.0 of jQuery based on user agent.
	 * If $user_agent is null (due to lack of HTTP header) we always serve
	 * jQuery 2.0.
	 *
	 * @param string $user_agent
	 *
	 * @return string
	 */
	public function get_jquery_version_based_on_browser( $user_agent ) {
		$js_path = AI1EC_ADMIN_THEME_JS_PATH . DIRECTORY_SEPARATOR;
		$jquery  = 'jquery_timely20.js';

		preg_match( '/MSIE (.*?);/', $user_agent, $matches );
		if ( count( $matches ) > 1 ) {
			//Then we're using IE
			$version = (int) $matches[1];
			if ( $version <= 8 ) {
				//IE 8 or under!
				$jquery = 'jquery_timely19.js';
			}
		}
		return file_get_contents( $js_path . $jquery );
	}

	/**
	 * Creates a requirejs module that can be used for translations
	 *
	 * @param string $object_name
	 * @param array $data
	 *
	 * @return string
	 */
	public function create_require_js_module( $object_name, array $data ) {
		foreach ( (array) $data as $key => $value ) {
			if ( ! is_scalar( $value ) )
				continue;
			$data[$key] = html_entity_decode( (string) $value, ENT_QUOTES, 'UTF-8');
		}
		$json_data = json_encode( $data );
		$prefix = self::REQUIRE_NAMESPACE;
		$script = "$prefix.define( '$object_name', $json_data );";

		return $script;
	}

	/**
	 * Create the array needed for translation and passing other settings to JS.
	 *
	 * @return $data array the dynamic data array
	 */
	public function get_translation_data() {

		$force_ssl_admin = force_ssl_admin();
		if ( $force_ssl_admin && ! is_ssl() ) {
			force_ssl_admin( false );
		}
		$ajax_url        = ai1ec_admin_url( 'admin-ajax.php' );
		force_ssl_admin( $force_ssl_admin );
		$settings        = $this->_registry->get( 'model.settings' );
		$locale          = $this->_registry->get( 'p28n.wpml' );
		$blog_timezone   = $this->_registry->get( 'model.option' )
			->get( 'gmt_offset' );
		$application = $this->_registry->get( 'bootstrap.registry.application' );
		$data            = array(
			'calendar_feeds_nonce'           => wp_create_nonce( 'ai1ec_ics_feed_nonce'),
			// ICS feed error messages
			'duplicate_feed_message'         => esc_html(
				Ai1ec_I18n::__( 'This feed is already being imported.' )
			),
			'invalid_url_message'            => esc_html(
				Ai1ec_I18n::__( 'Please enter a valid iCalendar URL.' )
			),
			'invalid_email_message'          => esc_html(
				Ai1ec_I18n::__( 'Please enter a valid email address.' )
			),
			'choose_image_message'           => Ai1ec_I18n::__( 'Choose Image' ),
			'now'                            => $this->_registry->get( 'date.system' )
				->current_time(),
			'size_less_variable_not_ok'      => Ai1ec_I18n::__(
				'The value you have entered is not a valid CSS length.'
			),
			'confirm_reset_theme'            => Ai1ec_I18n::__(
				'Are you sure you want to reset your theme options to their default values?'
			),
			'error_message_not_valid_lat'    => Ai1ec_I18n::__(
				'Please enter a valid latitude. A valid latitude is comprised between +90 and -90.'
			),
			'error_message_not_valid_long'   => Ai1ec_I18n::__(
				'Please enter a valid longitude. A valid longitude is comprised between +180 and -180.'
			),
			'error_message_not_entered_lat'  => Ai1ec_I18n::__(
				'When the "Input coordinates" checkbox is checked, "Latitude" is a required field.'
			),
			'error_message_not_entered_long' => Ai1ec_I18n::__(
				'When the "Input coordinates" checkbox is checked, "Longitude" is a required field.'
			),
			'ai1ec_contact_url_not_valid'         => Ai1ec_I18n::__(
				'The URL you have entered in the <b>Organizer Contact Info</b> &gt; <b>Website URL</b> seems to be invalid.'
			),
			'ai1ec_ticket_url_not_valid'           => Ai1ec_I18n::__(
				'The URL you have entered in the <b>Event Cost and Tickets</b> &gt; <b>Buy Tickets URL</b> seems to be invalid.'
			),
			'general_url_not_valid'          => Ai1ec_I18n::__(
				'Please remember that URLs must start with either "http://" or "https://".'
			),
			'calendar_loading'               => Ai1ec_I18n::__(
				'Loading&hellip;'
			),
			'ticketing_required_fields'      => Ai1ec_I18n::__(
				'<p class="ai1ec_ticketing_required_alert"><b>Some fields required for Ticketing are missing.</b><br><i>Missing or incorrect fields are outlined red.</i></p>'
			),
			'language'                       => $this->_registry->get( 'p28n.wpml' )->get_lang(),
			'ajax_url'                       => $ajax_url,
			// 24h time format for time pickers
			'twentyfour_hour'                => $settings->get( 'input_24h_time' ),
			// Date format for date pickers
			'date_format'                    => $settings->get( 'input_date_format' ),
			// Names for months in date picker header (escaping is done in wp_localize_script)
			'month_names'                    => $locale->get_localized_month_names(),
			// Names for days in date picker header (escaping is done in wp_localize_script)
			'day_names'                      => $locale->get_localized_week_names(),
			// Start the week on this day in the date picker
			'week_start_day'                 => $settings->get( 'week_start_day' ),
			'week_view_starts_at'            => $settings->get( 'week_view_starts_at' ),
			'week_view_ends_at'              => $settings->get( 'week_view_ends_at' ),
			'blog_timezone'                  => $blog_timezone,
			'affix_filter_menu'              => $settings->get( 'affix_filter_menu' ),
			'affix_vertical_offset_md'       => $settings->get( 'affix_vertical_offset_md' ),
			'affix_vertical_offset_lg'       => $settings->get( 'affix_vertical_offset_lg' ),
			'affix_vertical_offset_sm'       => $settings->get( 'affix_vertical_offset_sm' ),
			'affix_vertical_offset_xs'       => $settings->get( 'affix_vertical_offset_xs' ),
			'calendar_page_id'               => $settings->get( 'calendar_page_id' ),
			'region'                         => ( $settings->get( 'geo_region_biasing' ) ) ? $locale->get_region() : '',
			'site_url'                       => trailingslashit(
				ai1ec_get_site_url()
			),
			'javascript_widgets'             => array(),
			'widget_creator'                 => array(
				'preview'         => Ai1ec_I18n::__( 'Preview:' ),
				'preview_loading' => Ai1ec_I18n::__(
					'Loading preview&nbsp;<i class="ai1ec-fa ai1ec-fa-spin ai1ec-fa-spinner"></i>'
				)
			),
			'ticketing'                       => array(
				'details'         => Ai1ec_I18n::__( 'Ticketing Details' ),
				'hide_details'    => Ai1ec_I18n::__( 'Hide Ticketing Details' ),
				'loading_details' => Ai1ec_I18n::__( 'Loading tickets details...' ),
				'type_and_price'  => Ai1ec_I18n::__( 'Type and price' ),
				'info'            => Ai1ec_I18n::__( 'Info' ),
				'report'          => Ai1ec_I18n::__( 'Report' ),
				'sale_dates'      => Ai1ec_I18n::__( 'Sale dates' ),
				'limits'          => Ai1ec_I18n::__( 'Limits' ),
				'actions'         => Ai1ec_I18n::__( 'Actions' ),
				'sold'            => Ai1ec_I18n::__( 'Sold:' ),
				'left'            => Ai1ec_I18n::__( 'Left:' ),
				'start'           => Ai1ec_I18n::__( 'Start:' ),
				'end'             => Ai1ec_I18n::__( 'End:' ),
				'min'             => Ai1ec_I18n::__( 'Min:' ),
				'max'             => Ai1ec_I18n::__( 'Max:' ),
				'attendees'       => Ai1ec_I18n::__( 'Attendees' ),
				'hide_attendees'  => Ai1ec_I18n::__( 'Hide Attendees' ),
				'attendees_list'  => Ai1ec_I18n::__( 'Attendees List' ),
				'guest_name'      => Ai1ec_I18n::__( 'Guest Name' ),
				'status'          => Ai1ec_I18n::__( 'Status' ),
				'email'           => Ai1ec_I18n::__( 'Email' ),
				'no_attendees'    => Ai1ec_I18n::__( 'No attendees for this ticket type.' ),
				'edit'            => Ai1ec_I18n::__( 'Edit' ),
				'code'            => Ai1ec_I18n::__( 'Code' ),
				'unlimited'       => Ai1ec_I18n::__( 'Unlimited' )
			),
			'review'                         => array(
				'message_sent'  => Ai1ec_I18n::__( 'Your message has been sent. Thank you for your feedback.' ),
				'message_error' => Ai1ec_I18n::__( 'Your message has not been sent. Please try again or contact us.' )
			),
			'load_views_error'                 => Ai1ec_I18n::__(
				'Something went wrong while fetching events.<br>The request status is: %STATUS% <br>The error thrown was: %ERROR%'
			),
			'load_views_error_popup_title'   => Ai1ec_I18n::__( 'Response text received from server' ),
			'load_views_error_link_popup'    => Ai1ec_I18n::__( 'Click here for technical details' ),
			'cookie_path'                    => $this->_registry->get(
				'cookie.utility'
			)->get_path_for_cookie(),
			'disable_autocompletion'         => $settings->get( 'disable_autocompletion' ),
			'end_must_be_after_start'        => __( 'The end date can\'t be earlier than the start date.', AI1EC_PLUGIN_NAME ),
			'show_at_least_six_hours'        => __( 'For week and day view, you must select an interval of at least 6 hours.', AI1EC_PLUGIN_NAME ),
			'ai1ec_permalinks_enabled'       => $application->get( 'permalinks_enabled' ),
		);
		return apply_filters( 'ai1ec_js_translations', $data );
	}

	/**
	 * Get the array with translated data for the frontend
	 *
	 * @return array
	 */
	public function get_frontend_translation_data() {
		$data = array(
			'export_url' => AI1EC_EXPORT_URL,
		);

		// Replace desired CSS selector with calendar, if selector has been set
		$calendar_selector = $this->_settings->get( 'calendar_css_selector' );
		if( $calendar_selector ) {
			$page             = get_post(
				$this->_settings->get( 'calendar_page_id' )
			);
			$data['selector'] = $calendar_selector;
			$data['title']    = $page->post_title;
		}

		// DEPRECATED: Only still here for backwards compatibility with Ai1ec 1.x.
		$data['fonts'] = array();
		$fonts_dir = AI1EC_DEFAULT_THEME_URL . 'font_css/';
		$data['fonts'][] = array(
			'name' => 'League Gothic',
			'url'  => $fonts_dir . 'font-league-gothic.css',
		);
		$data['fonts'][] = array(
			'name' => 'fontawesome',
			'url'  => $fonts_dir . 'font-awesome.css',
		);
		return $data;
	}

	/**
	 * Echoes the Javascript if not cached.
	 *
	 * Echoes the javascript with the correct content.
	 * Since the content is dinamic, i use the hash function.
	 *
	 * @param string $javascript
	 *
	 * @return void
	 */
	private function _echo_javascript( $javascript ) {
		$conditional_get = new HTTP_ConditionalGet( array(
			'contentHash' => md5( $javascript )
			)
		);
		$conditional_get->sendHeaders();
		if ( ! $conditional_get->cacheIsValid ) {
			$http_encoder = $this->_registry->get(
				'http.encoder',
				array(
					'content' => $javascript,
					'type' => 'text/javascript'
				)
			);
			$compression_level = null;
			if ( $this->_registry->get( 'model.settings' )->get( 'disable_gzip_compression' ) ) {
				// set the compression level to 0 to disable it.
				$compression_level = 0;
			}
			$http_encoder->encode( $compression_level );
			$http_encoder->sendAll();
		}
		Ai1ec_Http_Response_Helper::stop( 0 );
	}

	/**
	 * Create the config object for requirejs.
	 *
	 * @return string
	 */
	public function create_require_js_config_object() {
		$js_url    = AI1EC_ADMIN_THEME_JS_URL;
		$version   = AI1EC_VERSION;
		$namespace = self::REQUIRE_NAMESPACE;
		$config    = <<<JSC
		$namespace.require.config( {
			waitSeconds : 15,
			urlArgs     : 'ver=$version',
			baseUrl     : '$js_url'
		} );
JSC;
		return $config;
	}

	/**
	 *	Check if we are in the calendar feeds page
	 *
	 * @return boolean TRUE if we are in the calendar feeds page FALSE otherwise
	 */
	public function are_we_on_calendar_feeds_page() {
		$path_details = pathinfo( $_SERVER["SCRIPT_NAME"] );
		$post_type = isset( $_GET['post_type'] ) ? $_GET['post_type'] : FALSE;
		$page = isset( $_GET['page'] ) ? $_GET['page'] : FALSE;
		if( $post_type === FALSE || $page === FALSE ) {
			return FALSE;
		}
		$is_calendar_feed_page = $path_details['basename'] === 'edit.php' &&
		                         $post_type                === 'ai1ec_event' &&
		                         $page                     === 'all-in-one-event-calendar-feeds';
		return $is_calendar_feed_page;
	}

	/**
	 * Add the link to render the javascript
	 *
	 * @param string $page
	 * @param boolean $backend
	 *
	 * @return void
	 */
	public function add_link_to_render_js( $page, $backend ) {
		$load_backend_script = 'false';
		if ( true === $backend ) {
			$load_backend_script = self::TRUE_PARAM;
		}
		$is_calendar_page = false;
		if(
			true === is_page( $this->_settings->get( 'calendar_page_id' ) ) ||
			self::CALENDAR_PAGE_JS === $page
		) {
			$is_calendar_page = self::TRUE_PARAM;
		}

		$url = add_query_arg(
			array(
				// Add the page to load
				self::LOAD_JS_PARAMETER    => $page,
				// If we are in the backend, we must load the common scripts
				self::IS_BACKEND_PARAMETER => $load_backend_script,
				// If we are on the calendar page we must load the correct option
				self::IS_CALENDAR_PAGE     => $is_calendar_page,
			),
			trailingslashit( ai1ec_get_site_url() )
		);
		if (
			$this->_settings->get( 'cache_dynamic_js' ) &&
			$is_calendar_page &&
			'1' === $this->_registry->get( 'model.option' )->get( 'calendarjsupdated' ) &&
			$this->_registry->get( 'filesystem.checker' )->check_file_exists(
				AI1EC_PATH . self::CALENDAR_JS_CACHE_FILE,
				true
			)
		) {
			$url = plugin_dir_url( 'all-in-one-event-calendar/public/js_cache/.' ) . $page;
		}

		if ( true === $backend ) {
			$this->_scripts_helper->enqueue_script(
					self::JS_HANDLE,
					$url,
					array( 'postbox' ),
					true
			);
		} else {
			$this->_scripts_helper->enqueue_script(
					self::JS_HANDLE,
					$url,
					array(),
					false
			);
		}
	}

	/**
	 * check if we are editing an event
	 *
	 * @return boolean TRUE if we are editing an event FALSE otherwise
	 */
	private function _are_we_editing_an_event() {
		$path_details = pathinfo( $_SERVER["SCRIPT_NAME"] );
		$post_id = isset( $_GET['post'] ) ? $_GET['post'] : FALSE;
		$action = isset( $_GET['action'] ) ? $_GET['action'] : FALSE;
		if( $post_id === FALSE || $action === FALSE ) {
			return FALSE;
		}

		$editing = (
			'post.php' === $path_details['basename'] &&
			'edit'     === $action &&
			$this->_aco->is_our_post_type( $post_id )
		);
		return $editing;
	}

	/**
	 * check if we are viewing events list
	 *
	 * @return boolean TRUE if we are on the events list FALSE otherwise
	 */
	private function _are_we_managing_events_list() {
		$path_details = pathinfo( $_SERVER['SCRIPT_NAME'] );
		$post_type    = isset( $_GET['post_type'] ) ? $_GET['post_type'] : FALSE;
		if ( FALSE === $post_type ) {
			return FALSE;
		}
		$page = isset( $_GET['page'] ) ? $_GET['page'] : '';
		$events_list = (
			'edit.php'    === $path_details['basename'] &&
			'ai1ec_event' === $post_type &&
			ai1ec_is_blank( $page )	
		);
		return $events_list;
	}

	/**
	 * check if we are creating a new event
	 *
	 * @return boolean TRUE if we are creating a new event FALSE otherwise
	 */
	private function _are_we_creating_a_new_event() {
		$path_details = pathinfo( $_SERVER['SCRIPT_NAME'] );
		$post_type = isset( $_GET['post_type'] ) ? $_GET['post_type'] : '';
		return $path_details['basename'] === 'post-new.php' &&
				$post_type === AI1EC_POST_TYPE;
	}

	/**
	 * Check if we are accessing the settings page
	 *
	 * @return boolean TRUE if we are accessing the settings page FALSE otherwise
	 */
	private function _are_we_accessing_the_calendar_settings_page() {
		$path_details = pathinfo( $_SERVER['SCRIPT_NAME'] );
		$page = isset( $_GET['page'] ) ? $_GET['page'] : '';
		return $path_details['basename'] === 'edit.php' &&
				$page === AI1EC_PLUGIN_NAME . '-settings';
	}

	protected function _are_we_creating_widgets() {
		$path_details = pathinfo( $_SERVER['SCRIPT_NAME'] );
		$page = isset( $_GET['page'] ) ? $_GET['page'] : '';
		return $path_details['basename'] === 'edit.php' &&
			$page === AI1EC_PLUGIN_NAME . '-widget-creator';
	}

	protected function _are_we_managing_tickets() {
		$path_details = pathinfo( $_SERVER['SCRIPT_NAME'] );
		$page = isset( $_GET['page'] ) ? $_GET['page'] : '';
		return $path_details['basename'] === 'edit.php' &&
			$page === AI1EC_PLUGIN_NAME . '-tickets';
	}

	/**
	 * Check if we are editing less variables
	 *
	 * @return boolean TRUE if we are accessing a single event page FALSE otherwise
	 */
	private function _are_we_editing_less_variables() {
		$path_details = pathinfo( $_SERVER["SCRIPT_NAME"] );
		$page = isset( $_GET['page'] ) ? $_GET['page'] : '';
		return $path_details['basename'] === 'edit.php' && $page === AI1EC_PLUGIN_NAME . '-edit-css';
	}

	/**
	 * Check if we are accessing the events category page
	 *
	 * @return boolean TRUE if we are accessing the events category page FALSE otherwise
	 */
	private function _are_we_editing_event_categories() {
		$path_details = pathinfo( $_SERVER["SCRIPT_NAME"] );
		$post_type = isset( $_GET['post_type'] ) ? $_GET['post_type'] : '';
		return $path_details['basename'] === 'edit-tags.php' && $post_type === AI1EC_POST_TYPE;
	}

	/**
	 * Check if we are accessing a single event page
	 *
	 * @return boolean TRUE if we are accessing a single event page FALSE otherwise
	 */
	private function _are_we_accessing_the_single_event_page() {
		return $this->_aco->is_our_post_type();
	}

}