<?php
/**
 * Front-end redirects for empty C7 base routes.
 *
 * @package C7DBT
 */

defined( 'ABSPATH' ) || exit;

class C7DBT_Redirects {

	/**
	 * Hook template_redirect.
	 */
	public function hooks() {
		// After most plugins, before template load. Avoid fighting early canonical redirects.
		add_action( 'template_redirect', array( $this, 'maybe_redirect' ), 20 );
	}

	/**
	 * Built-in + custom redirects.
	 */
	public function maybe_redirect() {
		if ( ! $this->should_attempt_redirect() ) {
			return;
		}

		$request_path = $this->current_path();
		if ( '' === $request_path || '/' === $request_path ) {
			return;
		}

		$settings = C7DBT_Settings::get();
		$map      = $this->get_redirect_map( $settings );

		if ( ! isset( $map[ $request_path ] ) ) {
			return;
		}

		$target = $map[ $request_path ];
		if ( ! $target || $target === $request_path ) {
			return;
		}

		$dest = home_url( $target );

		// Preserve query string (UTMs, etc.).
		$query = isset( $_SERVER['QUERY_STRING'] ) ? wp_unslash( $_SERVER['QUERY_STRING'] ) : ''; // phpcs:ignore
		if ( is_string( $query ) && '' !== $query ) {
			$dest = add_query_arg( wp_parse_args( $query ), $dest );
		}

		/**
		 * Filter redirect destination URL.
		 *
		 * @param string $dest Destination.
		 * @param string $request_path Request path.
		 */
		$dest = apply_filters( 'c7dbt_redirect_destination', $dest, $request_path );

		wp_safe_redirect( $dest, 301 );
		exit;
	}

	/**
	 * Whether redirects are safe to run.
	 *
	 * @return bool
	 */
	private function should_attempt_redirect() {
		if ( is_admin() || wp_doing_ajax() || wp_doing_cron() || is_preview() || is_customize_preview() ) {
			return false;
		}

		if ( defined( 'REST_REQUEST' ) && REST_REQUEST ) {
			return false;
		}

		if ( defined( 'XMLRPC_REQUEST' ) && XMLRPC_REQUEST ) {
			return false;
		}

		// Elementor editor / preview.
		if ( isset( $_GET['elementor-preview'] ) || isset( $_GET['elementor_library'] ) ) { // phpcs:ignore
			return false;
		}
		if ( isset( $_GET['action'] ) && 'elementor' === $_GET['action'] ) { // phpcs:ignore
			return false;
		}

		// Feeds / robots / sitemaps.
		if ( is_feed() || is_robots() || is_trackback() ) {
			return false;
		}

		$request_uri = isset( $_SERVER['REQUEST_URI'] ) ? wp_unslash( $_SERVER['REQUEST_URI'] ) : ''; // phpcs:ignore
		if ( is_string( $request_uri ) && preg_match( '#/(wp-json|sitemap|wp-cron\.php)#i', $request_uri ) ) {
			return false;
		}

		return (bool) apply_filters( 'c7dbt_should_redirect', true );
	}

	/**
	 * Current request path with leading slash, no trailing slash (except root).
	 *
	 * @return string
	 */
	private function current_path() {
		$uri  = isset( $_SERVER['REQUEST_URI'] ) ? wp_unslash( $_SERVER['REQUEST_URI'] ) : '/'; // phpcs:ignore
		$path = wp_parse_url( $uri, PHP_URL_PATH );
		if ( ! is_string( $path ) || '' === $path ) {
			$path = '/';
		}
		$home_path = wp_parse_url( home_url( '/' ), PHP_URL_PATH );
		if ( is_string( $home_path ) && '/' !== $home_path && 0 === strpos( $path, rtrim( $home_path, '/' ) ) ) {
			$path = substr( $path, strlen( rtrim( $home_path, '/' ) ) );
			if ( '' === $path ) {
				$path = '/';
			}
		}
		$path = '/' . trim( $path, '/' );
		return ( '/' === $path ) ? '/' : untrailingslashit( $path );
	}

	/**
	 * Redirect map: from => to (paths with leading slash).
	 *
	 * @param array $settings Settings.
	 * @return array
	 */
	public function get_redirect_map( array $settings ) {
		$map  = array();
		$slug = isset( $settings['default_collection_slug'] ) ? C7DBT_Helpers::sanitize_slug( $settings['default_collection_slug'] ) : '';

		if ( ! empty( $settings['redirect_collection_root'] ) && $slug ) {
			$map['/collection'] = '/collection/' . $slug;
		}

		if ( ! empty( $settings['redirect_product_root'] ) ) {
			$target = ! empty( $settings['product_redirect_target'] )
				? C7DBT_Helpers::sanitize_slug( $settings['product_redirect_target'] )
				: '';
			if ( $target ) {
				if ( 0 !== strpos( $target, 'product/' ) ) {
					$target = 'product/' . $target;
				}
				$map['/product'] = '/' . ltrim( $target, '/' );
			}
		}

		if ( ! empty( $settings['custom_redirects'] ) && is_array( $settings['custom_redirects'] ) ) {
			foreach ( $settings['custom_redirects'] as $row ) {
				if ( empty( $row['from'] ) || empty( $row['to'] ) ) {
					continue;
				}
				$from = '/' . trim( C7DBT_Helpers::sanitize_slug( $row['from'] ), '/' );
				$to   = '/' . trim( C7DBT_Helpers::sanitize_slug( $row['to'] ), '/' );
				if ( $from && $to && $from !== $to ) {
					$map[ $from ] = $to;
				}
			}
		}

		return apply_filters( 'c7dbt_redirect_map', $map );
	}

	/**
	 * Status for dashboard.
	 *
	 * @return array
	 */
	public function status() {
		$settings = C7DBT_Settings::get();
		$map      = $this->get_redirect_map( $settings );
		$count    = count( $map );

		if ( empty( $settings['redirect_collection_root'] ) ) {
			return array(
				'status' => 'warn',
				'label'  => __( 'Collection redirect off', '7labs-debug-branding-for-commerce7' ),
				'detail' => __( 'Enable redirect so /collection is not an empty page.', '7labs-debug-branding-for-commerce7' ),
				'count'  => $count,
			);
		}

		return array(
			'status' => 'ok',
			'label'  => __( 'Redirects active', '7labs-debug-branding-for-commerce7' ),
			'detail' => sprintf(
				/* translators: %d: number of redirects */
				_n( '%d redirect rule active.', '%d redirect rules active.', $count, '7labs-debug-branding-for-commerce7' ),
				$count
			),
			'count'  => $count,
		);
	}
}