<?php
class WPSunshine_Address_Autocomplete {

	protected static $_instance = null;
	private $prefix             = 'wps_aa_';
	private $options;
	private $late_instances = array();

	public static function instance() {
		if ( is_null( self::$_instance ) ) {
			self::$_instance = new self();
		}
		return self::$_instance;
	}

	public function __construct() {

		$this->includes();
		$this->init_hooks();

	}

	private function includes() {

		include_once WPS_AA_PATH . 'includes/class-picker.php';

		if ( is_admin() ) {
			include_once WPS_AA_PATH . 'includes/admin/class-options.php';
			include_once WPS_AA_PATH . 'includes/admin/class-setup.php';
			include_once WPS_AA_PATH . 'includes/admin/class-setup-updates.php';
			include_once WPS_AA_PATH . 'includes/admin/promos.php';
		}

	}

	private function init_hooks() {

		add_action( 'init', array( $this, 'set_places_api_default' ) );
		add_action( 'wp_head', array( $this, 'frontend_js' ), 9999 );

	}

	/**
	 * Places API (New) is the default, but sites from before 2.0 were all on
	 * the legacy API and never saved this setting. Save it once so those sites
	 * stay on legacy, and new installs start on New.
	 */
	public function set_places_api_default() {
		if ( false !== get_option( 'wps_aa_places_api' ) ) {
			return;
		}
		update_option( 'wps_aa_places_api', get_option( 'wps_aa_google_api_key' ) ? 'legacy' : 'new' );
	}

	public function get_instances() {
		$instances = get_option( 'wps_aa_instances' );
		if ( empty( $instances ) && is_admin() ) { // Set a default instance in the admin
			// A fixed key, so saving the settings page finds the instance it showed
			$key       = 'default';
			$instances = array(
				$key => array(
					'label'             => '',
					'page'              => '',
					'init'              => '',
					'allowed_countries' => array(),
					'fields'            => array(),
				),
			);
		}
		// Nothing saved yet comes back as false, and the integrations add to an array
		if ( ! is_array( $instances ) ) {
			$instances = array();
		}
		return apply_filters( 'wps_aa_instances', $instances );
	}

	public function get_options( $force = false ) {
		if ( empty( $this->options ) || $force ) {
			$this->options = get_option( $this->prefix . 'options' );
		}
		return apply_filters( $this->prefix . 'options', $this->options );
	}

	public function get_option( $key ) {
		if ( ! empty( $this->options[ $key ] ) ) {
			return $this->options[ $key ];
		}
		return false;
	}

	private function available_instances( $page_id = '' ) {

		if ( empty( $page_id ) ) {
			$page_id = get_queried_object_id();
		}

		$instances = $this->get_instances();
		$instances = array_merge( is_array( $instances ) ? $instances : array(), $this->late_instances );
		// The instances this page load will use, after the ones saved in the settings
		$instances = apply_filters( 'wps_aa_available_instances', $instances );
		if ( empty( $instances ) ) {
			return false;
		}

		// Check for available instances to show on the current page
		$available_instances = array();
		foreach ( $instances as $instance ) {
			if ( ! empty( $instance['page'] ) ) {
				if ( is_array( $instance['page'] ) ) {
					if ( ! in_array( $page_id, $instance['page'] ) ) {
						continue;
					}
				} elseif ( $page_id != $instance['page'] ) {
					continue;
				}
			}
			$available_instances[] = $instance;
		}

		return $available_instances;

	}

	public function get_available_place_components() {
		$place_components = array(
			'5'  => array(
				'key'   => 'country',
				'tag'   => 'Country',
				'label' => 'Country',
			),
			'10' => array(
				'key'   => 'address1',
				'tag'   => 'Address 1',
				'label' => 'Address 1',
			),
			'20' => array(
				'key'   => 'address2',
				'tag'   => 'Address 2',
				'label' => 'Address 2',
			),
			'30' => array(
				'key'   => 'locality',
				'tag'   => 'City',
				'label' => 'Locality (City)',
			),
			'40' => array(
				'key'   => 'administrative_area_level_1',
				'tag'   => 'State',
				'label' => 'Administrative Area Level 1 (State/Region/Province)',
			),
			'50' => array(
				'key'   => 'postal_code',
				'tag'   => 'Postal Code',
				'label' => 'Postal Code',
			),
		);
		$place_components = apply_filters( 'wps_aa_place_components', $place_components );
		ksort( $place_components );
		return $place_components;
	}

	public function frontend_js() {

		if ( is_admin() ) {
			return;
		}

		$available_instances = $this->available_instances();
		if ( ! empty( $available_instances ) ) {

			$instances_data = array();
			foreach ( $available_instances as $instance ) {

				if ( empty( $instance['init'] ) ) {
					// If there is no init, no bother going any further - this is a bare minimum
					continue;
				}

				$fields = array();
				foreach ( $instance['fields'] as $field ) {
					if ( ! empty( $field['selector'] ) && ! empty( $field['data'] ) ) {
						$fields[] = array(
							'selector' => $field['selector'],
							'data'     => $field['data'],
							'delay'    => ( ! empty( $field['delay'] ) ) ? $field['delay'] : '',
						);
					}
				}
				$instances_data[] = array(
					'init'              => $instance['init'],
					'allowed_countries' => ( ! empty( $instance['allowed_countries'] ) ) ? $instance['allowed_countries'] : '',
					'fields'            => $fields,
					'delay'             => ( ! empty( $instance['delay'] ) ) ? $instance['delay'] : '',
				);

			}

			if ( ! empty( $instances_data ) && apply_filters( 'wps_aa_load_scripts', true ) ) {

				wp_enqueue_script(
					'wps-aa-google-maps',
					$this->google_maps_url(),
					'',
					'',
					array(
						'strategy'  => 'async',
						'in_footer' => true,
					)
				);

				$version      = ( defined( 'WPS_AA_PREMIUM_VERSION' ) ) ? WPS_AA_PREMIUM_VERSION : WPS_AA_VERSION;
				$places_api   = ( get_option( 'wps_aa_places_api' ) === 'legacy' ) ? 'legacy' : 'new';
				$dependencies = array( 'jquery', 'wps-aa-google-maps' );
				if ( $places_api === 'new' ) {
					wp_enqueue_script( 'wps-aa-places-new', WPS_AA_URL . 'assets/js/places-new.js', array(), $version, true );
					$dependencies[] = 'wps-aa-places-new';
				}

				wp_enqueue_script( 'wps-aa-frontend', WPS_AA_URL . 'assets/js/frontend.js', $dependencies, $version, true );
				$results_title = get_option( 'wps_aa_results_title' );
				$args          = array(
					'instances'     => $instances_data,
					'results_title' => $results_title,
					'places_api'    => $places_api,
				);
				wp_localize_script( 'wps-aa-frontend', 'wps_aa_vars', $args );
			}
		}

	}

	/**
	 * Set up an address field from inside a form as it is drawn. Form plugins
	 * draw their forms in the page content, after the page head where the
	 * scripts are normally set up, so this sets them up again for the footer.
	 *
	 * @param string $key      Unique key for this field.
	 * @param array  $instance Same shape as a saved instance.
	 */
	public function add_instance( $key, $instance ) {
		$this->late_instances[ $key ] = $instance;
		// Forms drawn in the footer still count, as long as the footer scripts have not printed yet
		if ( did_action( 'wp_head' ) && ! did_action( 'wp_print_footer_scripts' ) ) {
			$this->frontend_js();
		}
	}

	/**
	 * The Google Maps script URL, with the site's API key and language.
	 */
	public function google_maps_url() {
		$url = 'https://maps.googleapis.com/maps/api/js?key=' . sanitize_text_field( get_option( 'wps_aa_google_api_key' ) );

		$language = get_option( 'wps_aa_language' );
		if ( ! empty( $language ) ) {
			$url .= '&language=' . sanitize_text_field( $language );
		}

		return $url . '&callback=wps_aa&libraries=places&v=weekly&loading=async';
	}

	public function generate_key() {
		return md5( uniqid( time() ) );
	}

}