<?php

namespace Hostinger\Rest;

if ( ! defined( 'ABSPATH' ) ) {
	die;
}

use Hostinger\Admin\Options\PluginOptions;
use Hostinger\Admin\PluginSettings;
use Hostinger\DefaultOptions;
use Hostinger\Helper;

/**
 * Class for handling Settings Rest API
 */
class SettingsRoutes {
	/**
	 * @var PluginSettings plugin settings.
	 */
	private PluginSettings $plugin_settings;

	/**
	 * Construct class with dependencies
	 *
	 * @param PluginSettings $plugin_settings instance.
	 */
	public function __construct( PluginSettings $plugin_settings ) {
		$this->plugin_settings = $plugin_settings;
	}

	/**
	 * Return all stored plugin settings
	 *
	 * @param WP_REST_Request $request WordPress rest request.
	 *
	 * @return \WP_REST_Response
	 */

	/** PHPCS:disable Generic.CodeAnalysis.UnusedFunctionParameter.Found */
	public function get_settings( \WP_REST_Request $request ): \WP_REST_Response {
		global $wp_version;

		$data = array(
			'newest_wp_version'        => $this->get_latest_wordpress_version(),
			'current_wp_version'       => $wp_version,
			'php_version'              => phpversion(),
			'newest_php_version'       => '8.2', // Will be refactored.
			'is_eligible_www_redirect' => $this->is_eligible_www_redirect(),
		);

		// If it is not set for some reason then set it.
		if ( empty( $this->plugin_settings->get_plugin_settings()->get_bypass_code() ) ) {
			$options = new DefaultOptions();
			$options->install_bypass_code();
		}

		$plugin_settings = $this->plugin_settings->get_plugin_settings()->to_array();

		$response = array(
			'data' => array_merge( $data, $plugin_settings ),
		);

		$response = new \WP_REST_Response( $response );

		$response->set_headers( array( 'Cache-Control' => 'no-cache' ) );

		$response->set_status( \WP_Http::OK );

		return $response;
	}

	/**
	 * @param \WP_REST_Request $request
	 *
	 * @return \WP_REST_Response
	 */
	public function regenerate_bypass_code( \WP_REST_Request $request ): \WP_REST_Response {
		$settings = $this->plugin_settings->get_plugin_settings();

		$settings->set_bypass_code( Helper::generate_bypass_code( 16 ) );

		$new_settings = $settings->to_array();

		$new_plugin_options = new PluginOptions( $new_settings );

		$response = new \WP_REST_Response( array( 'data' => $this->plugin_settings->save_plugin_settings( $new_plugin_options )->to_array() ) );

		$response->set_headers( array( 'Cache-Control' => 'no-cache' ) );

		$response->set_status( \WP_Http::OK );

		return $response;
	}

	/**
	 * @param \WP_REST_Request $request
	 *
	 * @return \WP_REST_Response
	 */
	public function update_settings( \WP_REST_Request $request ): \WP_REST_Response {
		$settings = $this->plugin_settings->get_plugin_settings();

		$new_settings = array();

		$parameters = $request->get_params();

		foreach ( $settings->to_array() as $field_key => $field_value ) {
			// Don't allow to change bypass code
			if ( $field_key === 'bypass_code' ) {
				$new_settings[ $field_key ] = $field_value;
				continue;
			}

			if ( isset( $parameters[ $field_key ] ) ) {
				$new_settings[ $field_key ] = ! empty( $parameters[ $field_key ] );
			} else {
				$new_settings[ $field_key ] = $field_value;
			}
		}

		$new_plugin_options = new PluginOptions( $new_settings );

		$response = new \WP_REST_Response( array( 'data' => $this->plugin_settings->save_plugin_settings( $new_plugin_options )->to_array() ) );

		$this->update_urls( $new_plugin_options );

		$response->set_headers( array( 'Cache-Control' => 'no-cache' ) );

		$response->set_status( \WP_Http::OK );

		return $response;
	}
	/** PHPCS:enable */
	/**
	 * @param PluginOptions $plugin_options
	 *
	 * @return bool
	 */
	private function update_urls( PluginOptions $plugin_options ): bool {
		$siteurl = get_option( 'siteurl' );
		$home    = get_option( 'home' );

		if ( empty( $siteurl ) || empty( $home ) ) {
			return false;
		}

		if ( $plugin_options->get_force_https() ) {
			$siteurl = str_replace( 'http://', 'https://', $siteurl );
			$home    = str_replace( 'http://', 'https://', $home );
		}

		if ( $plugin_options->get_force_www() ) {
			$siteurl = $this->add_www_to_url( $siteurl );
			$home    = $this->add_www_to_url( $home );
		} else {
			$siteurl = str_replace( 'www.', '', $siteurl );
			$home    = str_replace( 'www.', '', $home );
		}

		update_option( 'siteurl', $siteurl );
		update_option( 'home', $home );

		return true;
	}

	/**
	 * @param string $url
	 *
	 * @return mixed
	 */
	private function add_www_to_url( string $url ): string {
		$parsed_url = wp_parse_url( $url );

		if ( isset( $parsed_url['host'] ) ) {
			$host = $parsed_url['host'];

			if ( strpos( $host, 'www.' ) !== 0 ) {
				$host = 'www.' . $host;
			}

			$parsed_url['host'] = $host;

			return $this->rebuild_url( $parsed_url );
		}

		return $url;
	}

	/**
	 * @param array $params
	 *
	 * @return string
	 */
	private function rebuild_url( array $params ): string {
		$scheme   = isset( $params['scheme'] ) ? $params['scheme'] . '://' : '';
		$host     = isset( $params['host'] ) ? $params['host'] : '';
		$path     = isset( $params['path'] ) ? $params['path'] : '';
		$query    = isset( $params['query'] ) ? '?' . $params['query'] : '';
		$fragment = isset( $params['fragment'] ) ? '#' . $params['fragment'] : '';

		return "$scheme$host$path$query$fragment";
	}

	/**
	 * @return string
	 */
	private function get_latest_wordpress_version(): string {
		$newest_wordpress_version = get_transient( 'hostinger_newest_wordpress_version' );

		if ( $newest_wordpress_version !== false ) {
			return $newest_wordpress_version;
		}

		$newest_wordpress_version = $this->fetch_wordpress_version();

		if ( ! empty( $newest_wordpress_version ) ) {
			set_transient( 'hostinger_newest_wordpress_version', $newest_wordpress_version, 86400 );

			return $newest_wordpress_version;
		}

		return '';
	}

	/**
	 * @return string
	 */
	private function fetch_wordpress_version(): string {
		$url      = 'https://api.wordpress.org/core/version-check/1.7/';
		$response = wp_remote_get( $url );

		if ( is_wp_error( $response ) ) {
			return '';
		}

		$response_body = wp_remote_retrieve_body( $response );

		if ( $response_body === false ) {
			return '';
		}

		$data = json_decode( $response_body, true );

		if ( json_last_error() !== JSON_ERROR_NONE || empty( $data['offers'][0]['current'] ) ) {
			return '';
		}

		return $data['offers'][0]['current'];
	}

	/**
	 * @return bool
	 */
	private function is_eligible_www_redirect(): bool {
		$is_eligible_www_redirect = get_transient( 'hostinger_is_eligible_www_redirect' );

		if ( $is_eligible_www_redirect !== false ) {
			return $is_eligible_www_redirect;
		}

		$domain     = str_replace( 'www.', '', get_option( 'siteurl' ) );
		$www_domain = $this->add_www_to_url( $domain );

		$is_eligible_www_redirect = $this->check_domain_records( $domain, $www_domain );

		if ( isset( $is_eligible_www_redirect ) ) {
			set_transient( 'hostinger_is_eligible_www_redirect', $is_eligible_www_redirect, 120 );

			return $is_eligible_www_redirect;
		}

		return '';
	}

	/**
	 * @param string $domain_a
	 * @param string $domain_b
	 *
	 * @return bool
	 */
	public function check_domain_records( string $domain_a, string $domain_b ): bool {
		return ( gethostbyname( $domain_a ) === gethostbyname( $domain_b ) );
	}
}