<?php
/**
 * The Google Maps field.
 *
 * @package Meta Box
 */

/**
 * Map field class.
 */
class RWMB_Map_Field extends RWMB_Field {
	/**
	 * Enqueue scripts and styles.
	 */
	public static function admin_enqueue_scripts() {
		wp_enqueue_style( 'rwmb-map', RWMB_CSS_URL . 'map.css', array(), RWMB_VER );

		/**
		 * Since June 2016, Google Maps requires a valid API key.
		 *
		 * @link http://googlegeodevelopers.blogspot.com/2016/06/building-for-scale-updates-to-google.html
		 * @link https://developers.google.com/maps/documentation/javascript/get-api-key
		 */
		$args            = func_get_args();
		$field           = $args[0];
		$google_maps_url = add_query_arg(
			array(
				'key'      => $field['api_key'],
				'language' => $field['language'],
			),
			'https://maps.google.com/maps/api/js'
		);

		/**
		 * Allows developers load more libraries via a filter.
		 *
		 * @link https://developers.google.com/maps/documentation/javascript/libraries
		 */
		$google_maps_url = apply_filters( 'rwmb_google_maps_url', $google_maps_url );
		wp_register_script( 'google-maps', esc_url_raw( $google_maps_url ), array(), RWMB_VER, true );
		wp_enqueue_script(
			'rwmb-map',
			RWMB_JS_URL . 'map.js',
			array(
				'jquery-ui-autocomplete',
				'google-maps',
			),
			RWMB_VER,
			true
		);
		RWMB_Helpers_Field::localize_script_once(
			'rwmb-map',
			'RWMB_Map',
			array(
				'no_results_string' => __( 'No results found', 'meta-box' ),
			)
		);
	}

	/**
	 * Get field HTML.
	 *
	 * @param mixed $meta  Meta value.
	 * @param array $field Field parameters.
	 *
	 * @return string
	 */
	public static function html( $meta, $field ) {
		$address = is_array( $field['address_field'] ) ? implode( ',', $field['address_field'] ) : $field['address_field'];
		$html    = sprintf(
			'<div class="rwmb-map-field" data-address-field="%s">',
			esc_attr( $address )
		);

		$html .= sprintf(
			'<div class="rwmb-map-canvas" data-default-loc="%s" data-region="%s"></div>
			<input type="hidden" name="%s" class="rwmb-map-coordinate" value="%s">',
			esc_attr( $field['std'] ),
			esc_attr( $field['region'] ),
			esc_attr( $field['field_name'] ),
			esc_attr( $meta )
		);

		$html .= '</div>';

		return $html;
	}

	/**
	 * Normalize parameters for field.
	 *
	 * @param array $field Field parameters.
	 *
	 * @return array
	 */
	public static function normalize( $field ) {
		$field = parent::normalize( $field );
		$field = wp_parse_args(
			$field,
			array(
				'std'           => '',
				'address_field' => '',
				'language'      => '',
				'region'        => '',

				// Default API key, required by Google Maps since June 2016.
				// Users should overwrite this key with their own key.
				'api_key'       => 'AIzaSyC1mUh87SGFyf133tpZQJa-s96p0tgnraQ',
			)
		);

		return $field;
	}

	/**
	 * Get the field value.
	 * The difference between this function and 'meta' function is 'meta' function always returns the escaped value
	 * of the field saved in the database, while this function returns more meaningful value of the field.
	 *
	 * @param  array    $field   Field parameters.
	 * @param  array    $args    Not used for this field.
	 * @param  int|null $post_id Post ID. null for current post. Optional.
	 *
	 * @return mixed Array(latitude, longitude, zoom)
	 */
	public static function get_value( $field, $args = array(), $post_id = null ) {
		$value                               = parent::get_value( $field, $args, $post_id );
		list( $latitude, $longitude, $zoom ) = explode( ',', $value . ',,' );
		return compact( 'latitude', 'longitude', 'zoom' );
	}

	/**
	 * Output the field value.
	 * Display Google maps.
	 *
	 * @param  array    $field   Field parameters.
	 * @param  array    $args    Additional arguments for the map.
	 * @param  int|null $post_id Post ID. null for current post. Optional.
	 *
	 * @return string HTML output of the field
	 */
	public static function the_value( $field, $args = array(), $post_id = null ) {
		$value = parent::get_value( $field, $args, $post_id );
		$args  = wp_parse_args(
			$args,
			array(
				'api_key' => isset( $field['api_key'] ) ? $field['api_key'] : '',
			)
		);
		return self::render_map( $value, $args );
	}

	/**
	 * Render a map in the frontend.
	 *
	 * @param array $location The [latitude, longitude[, zoom]] location.
	 * @param array $args     Additional arguments for the map.
	 *
	 * @return string
	 */
	public static function render_map( $location, $args = array() ) {
		list( $latitude, $longitude, $zoom ) = explode( ',', $location . ',,' );
		if ( ! $latitude || ! $longitude ) {
			return '';
		}

		$args = wp_parse_args(
			$args,
			array(
				'latitude'     => $latitude,
				'longitude'    => $longitude,
				'width'        => '100%',
				'height'       => '480px',
				'marker'       => true, // Display marker?
				'marker_title' => '', // Marker title, when hover.
				'info_window'  => '', // Content of info window (when click on marker). HTML allowed.
				'js_options'   => array(),
				'zoom'         => $zoom,

				// Default API key, required by Google Maps since June 2016.
				// Users should overwrite this key with their own key.
				'api_key'      => 'AIzaSyC1mUh87SGFyf133tpZQJa-s96p0tgnraQ',
			)
		);

		$google_maps_url = add_query_arg( 'key', $args['api_key'], 'https://maps.google.com/maps/api/js' );

		/*
		 * Allows developers load more libraries via a filter.
		 * @link https://developers.google.com/maps/documentation/javascript/libraries
		 */
		$google_maps_url = apply_filters( 'rwmb_google_maps_url', $google_maps_url );
		wp_register_script( 'google-maps', esc_url_raw( $google_maps_url ), array(), RWMB_VER, true );
		wp_enqueue_script( 'rwmb-map-frontend', RWMB_JS_URL . 'map-frontend.js', array( 'google-maps' ), RWMB_VER, true );

		/*
		 * Google Maps options.
		 * Option name is the same as specified in Google Maps documentation.
		 * This array will be convert to Javascript Object and pass as map options.
		 * @link https://developers.google.com/maps/documentation/javascript/reference
		 */
		$args['js_options'] = wp_parse_args(
			$args['js_options'],
			array(
				// Default to 'zoom' level set in admin, but can be overwritten.
				'zoom'      => $args['zoom'],

				// Map type, see https://developers.google.com/maps/documentation/javascript/reference#MapTypeId.
				'mapTypeId' => 'ROADMAP',
			)
		);

		$output = sprintf(
			'<div class="rwmb-map-canvas" data-map_options="%s" style="width:%s;height:%s"></div>',
			esc_attr( wp_json_encode( $args ) ),
			esc_attr( $args['width'] ),
			esc_attr( $args['height'] )
		);
		return $output;
	}
}
