<?php
/**
 * Front-end scripts and styles.
 *
 * @package Streetfill
 */

namespace Streetfill;

defined( 'ABSPATH' ) || exit;

/**
 * Loads the provider script where WooCommerce runs its address autocomplete.
 */
class Assets {

	/** Handle of WooCommerce's shared address autocomplete module. */
	const WC_COMMON = 'wc-address-autocomplete-common';

	/**
	 * Hooks.
	 */
	public static function init() {
		add_action( 'init', array( __CLASS__, 'register' ) );
		// After WooCommerce's own front-end scripts (priority 10).
		add_action( 'wp_enqueue_scripts', array( __CLASS__, 'enqueue' ), 20 );
	}

	/**
	 * Registers the address parsing and service scripts (also used by add-ons in the admin).
	 */
	public static function register() {
		wp_register_script( 'streetfill-parse', STREETFILL_URL . 'assets/js/parse.js', array(), STREETFILL_VERSION, true );
		wp_register_script( 'streetfill-services', STREETFILL_URL . 'assets/js/services.js', array( 'streetfill-parse' ), STREETFILL_VERSION, true );
	}

	/**
	 * Whether WooCommerce's address autocomplete is switched on.
	 *
	 * @return bool
	 */
	public static function wc_autocomplete_enabled() {
		return function_exists( 'wc_string_to_bool' ) && wc_string_to_bool( get_option( 'woocommerce_address_autocomplete_enabled', 'no' ) );
	}

	/**
	 * Whether this page has address fields WooCommerce autocompletes: checkout
	 * (not the order received or pay pages) and My Account → Addresses.
	 *
	 * @return bool
	 */
	public static function is_address_page() {
		$checkout = function_exists( 'is_checkout' ) && is_checkout()
			&& ! ( function_exists( 'is_wc_endpoint_url' ) && ( is_wc_endpoint_url( 'order-received' ) || is_wc_endpoint_url( 'order-pay' ) ) );
		$account  = function_exists( 'is_wc_endpoint_url' ) && is_wc_endpoint_url( 'edit-address' );
		// A checkout block or shortcode on a page other than WooCommerce's checkout page.
		$post = is_singular() ? get_post() : null;
		if ( ! $checkout && $post instanceof \WP_Post ) {
			$checkout = has_block( 'woocommerce/checkout', $post ) || has_shortcode( (string) $post->post_content, 'woocommerce_checkout' );
		}

		/**
		 * Whether Streetfill loads on this page. For themes that show the checkout
		 * or address forms on other pages.
		 *
		 * @param bool $load Whether the page has address fields.
		 */
		return (bool) apply_filters( 'streetfill_is_address_page', $checkout || $account );
	}

	/**
	 * Enqueues the provider script and styles.
	 */
	public static function enqueue() {
		if ( ! Settings::has_key() || ! self::wc_autocomplete_enabled() || ! self::is_address_page() ) {
			return;
		}

		wp_enqueue_script(
			'streetfill-provider',
			STREETFILL_URL . 'assets/js/provider.js',
			array( self::WC_COMMON, 'streetfill-services', 'wp-hooks' ),
			STREETFILL_VERSION,
			true
		);

		/**
		 * Front-end configuration of the provider script.
		 *
		 * @param array<string,mixed> $config Configuration.
		 */
		$config = apply_filters( 'streetfill_frontend_config', self::config() );
		wp_add_inline_script( 'streetfill-provider', 'var streetfillConfig = ' . wp_json_encode( $config ) . ';', 'before' );

		// The service's attribution stays whether or not our look is on.
		wp_enqueue_style( 'streetfill-attribution', STREETFILL_URL . 'assets/css/attribution.css', array(), STREETFILL_VERSION );
		if ( 'on' === Settings::get( 'style' ) ) {
			wp_enqueue_style( 'streetfill', STREETFILL_URL . 'assets/css/streetfill.css', array(), STREETFILL_VERSION );
		}
	}

	/**
	 * Configuration for provider.js.
	 *
	 * @return array<string,mixed>
	 */
	public static function config() {
		$service = Settings::service();
		return array(
			'providerId' => Plugin::PROVIDER_ID,
			'service'    => $service,
			'mapsUrl'    => 'google' === $service ? self::maps_url() : '',
			'key'        => 'google' === $service ? '' : Settings::key(),
			'language'   => self::google_language( determine_locale() ),
		);
	}

	/**
	 * URL of Google's Maps JavaScript API with the shop's key. The browser loads it
	 * only when a shopper first focuses an address field (provider.js).
	 *
	 * @return string
	 */
	public static function maps_url() {
		return add_query_arg(
			array(
				'key'      => rawurlencode( (string) Settings::get( 'api_key' ) ),
				'v'        => 'weekly',
				'loading'  => 'async',
				'language' => rawurlencode( self::google_language( determine_locale() ) ),
				'callback' => 'streetfillMapsReady',
			),
			'https://maps.googleapis.com/maps/api/js'
		);
	}

	/**
	 * Google's language code for a WordPress locale (de_DE_formal → de, pt_BR → pt-BR).
	 *
	 * @param string $locale WordPress locale.
	 * @return string
	 */
	public static function google_language( $locale ) {
		$locale = (string) $locale;
		$keep   = array( 'pt_BR', 'pt_PT', 'zh_CN', 'zh_TW', 'zh_HK', 'en_GB', 'en_AU', 'fr_CA', 'es_419' );
		if ( 1 === preg_match( '/^([a-z]{2,3}_[A-Z0-9]{2,3})/', $locale, $m ) && in_array( $m[1], $keep, true ) ) {
			return str_replace( '_', '-', $m[1] );
		}
		$primary = strtolower( (string) strtok( $locale, '_' ) );
		return 1 === preg_match( '/^[a-z]{2,3}$/', $primary ) ? $primary : 'en';
	}
}