<?php
/**
 * Map field class.
 */
class RWMB_Map_Field extends RWMB_Field {

	/**
	 * Enqueue scripts and styles
	 *
	 * @return void
	 */
	static function admin_enqueue_scripts() {
		/**
		 * 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( 'key', $field['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(), '', true );
		wp_enqueue_style( 'rwmb-map', RWMB_CSS_URL . 'map.css' );
		wp_enqueue_script( 'rwmb-map', RWMB_JS_URL . 'map.js', array( 'jquery-ui-autocomplete', 'google-maps' ), RWMB_VER, true );
	}

	/**
	 * Get field HTML
	 *
	 * @param mixed $meta
	 * @param array $field
	 *
	 * @return string
	 */
	static function html( $meta, $field ) {
		$html = '<div class="rwmb-map-field">';

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

		if ( $address = $field['address_field'] ) {
			$html .= sprintf(
				'<button class="button rwmb-map-goto-address-button" value="%s">%s</button>',
				is_array( $address ) ? implode( ',', $address ) : $address,
				__( 'Find Address', 'meta-box' )
			);
		}

		$html .= '</div>';

		return $html;
	}

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

			// 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)
	 */
	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. Not used for these fields.
	 * @param  int|null $post_id Post ID. null for current post. Optional.
	 *
	 * @return mixed Field value
	 */
	static function the_value( $field, $args = array(), $post_id = null ) {
		$value = self::get_value( $field, $args, $post_id );
		if ( ! $value['latitude'] || ! $value['longitude'] ) {
			return '';
		}
		if ( ! $value['zoom'] ) {
			$value['zoom'] = 14;
		}

		$args = wp_parse_args( $args, array(
			'latitude'     => $value['latitude'],
			'longitude'    => $value['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(),

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

		/*
		 * Enqueue scripts
		 * API key is get from $field (if found by RWMB_Helper::find_field()) or $args as a fallback
		 * Note: We still can enqueue script which outputs in the footer
		 */
		$api_key = isset( $field['api_key'] ) ? $field['api_key'] : $args['api_key'];
		$google_maps_url = add_query_arg( 'key', $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(), '', true );
		wp_enqueue_script( 'rwmb-map-frontend', RWMB_JS_URL . 'map-frontend.js', array( 'google-maps' ), '', 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'      => $value['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;
	}
}
