<?php

use InstaWP\Connect\Helpers;
use InstaWP\Connect\Helpers\Helper;
use InstaWP\Connect\Helpers\Option;
use InstaWP\Connect\Helpers\Curl;

defined( 'ABSPATH' ) || die;

class InstaWP_Rest_Api_Migration extends InstaWP_Rest_Api {

	public function __construct() {
		parent::__construct();

		add_action( 'rest_api_init', array( $this, 'add_api_routes' ) );
	}

	public function add_api_routes() {
		register_rest_route(
			$this->namespace . '/' . $this->version_3,
			'/pull',
			array(
				'methods'             => 'POST',
				'callback'            => array( $this, 'handle_pull_api' ),
				'permission_callback' => '__return_true',
			)
		);

		register_rest_route(
			$this->namespace . '/' . $this->version_3,
			'/push',
			array(
				'methods'             => 'POST',
				'callback'            => array( $this, 'handle_push_api' ),
				'permission_callback' => '__return_true',
			)
		);

		register_rest_route(
			$this->namespace . '/' . $this->version_3,
			'/post-cleanup',
			array(
				'methods'             => 'POST',
				'callback'            => array( $this, 'handle_post_migration_cleanup' ),
				'permission_callback' => '__return_true',
			)
		);

		register_rest_route(
			$this->namespace . '/' . $this->version_3,
			'/update-migration',
			array(
				'methods'             => 'POST',
				'callback'            => array( $this, 'handle_update_migration' ),
				'permission_callback' => '__return_true',
			)
		);
	}

	/**
	 * Handle update migration API
	 *
	 * @param WP_REST_Request $request
	 *
	 * @return WP_REST_Response
	 */
	public function handle_update_migration( WP_REST_Request $request ) {

		$response = $this->validate_api_request( $request );
		if ( is_wp_error( $response ) ) {
			return $this->throw_error( $response );
		}

		$is_end_to_end = sanitize_text_field( $request->get_param( 'is_end_to_end' ) );
		$status        = sanitize_text_field( $request->get_param( 'status' ) );

		$existing                   = Option::get_option( 'instawp_migration_details', array() );
		$existing['is_end_to_end']  = $is_end_to_end;
		$existing['status']         = $status;

		Option::update_option( 'instawp_migration_details', $existing );

		return $this->send_response(
			array(
				'success' => true,
				'message' => esc_html__( 'Migration details updated successfully.', 'instawp-connect' ),
			)
		);
	}

	/**
	 * Handle response for pull api
	 *
	 * @param WP_REST_Request $request
	 *
	 * @return WP_REST_Response
	 */
	public function handle_pull_api( WP_REST_Request $request ) {

		$response = $this->validate_api_request( $request );
		if ( is_wp_error( $response ) ) {
			return $this->throw_error( $response );
		}

		$migrate_key = sanitize_text_field( $request->get_param( 'migrate_key' ) );

		// Prevent a new migration from destroying an active one's options file.
		// get_pull_pre_check_response() calls clean_instawpbackups_dir() which deletes ALL files,
		// including the options-{key}.txt needed by the in-progress migration's iwp-serve endpoint.
		// - Different key + active migration → 409 error (protects active options file)
		// - Same key (idempotent retry) → allowed through (file will be safely recreated)
		// - No active migration → allowed through (normal flow)
		// - Stale migration (>24h or terminated on client-app) → auto-cleared and allowed through
		$existing_migration   = Option::get_option( 'instawp_migration_details', array() );
		$existing_key         = Helper::get_args_option( 'migrate_key', $existing_migration );
		$existing_status      = Helper::get_args_option( 'status', $existing_migration );
		$existing_started_at  = Helper::get_args_option( 'started_at', $existing_migration );
		$terminal_statuses    = array( 'completed', 'failed', 'aborted', 'timeout' );
		$is_stale             = ! empty( $existing_started_at ) && ( time() - strtotime( $existing_started_at ) ) > DAY_IN_SECONDS;

		if ( ! empty( $existing_key ) && ! in_array( $existing_status, $terminal_statuses, true ) && $existing_key !== $migrate_key ) {
			$should_clear = false;

			// Check with client-app if the existing migration is still active using source_url.
			$source_url   = rawurlencode( Helper::wp_site_url( '', true ) );
			$api_response = Curl::do_curl( "migrates-v3/check-status?source_url={$source_url}", array(), array(), 'GET' );
			$api_data     = Helper::get_args_option( 'data', $api_response, array() );
			$api_status   = Helper::get_args_option( 'status', $api_data );

			// If client-app says migration is terminal or not found — clear it.
			if ( in_array( $api_status, $terminal_statuses, true ) || ( isset( $api_response['success'] ) && ! $api_response['success'] ) ) {
				$should_clear = true;
			}

			// Fallback: treat migration older than 24 hours as stale.
			if ( ! $should_clear && $is_stale ) {
				$should_clear = true;
			}

			if ( $should_clear ) {
				instawp_reset_running_migration();
			} else {
				return $this->throw_error(
					new WP_Error(
						409,
						esc_html__( 'A migration is already in progress. Please wait for it to complete or reset it before starting a new one.', 'instawp-connect' )
					)
				);
			}
		}

		$is_end_to_end            = sanitize_text_field( $request->get_param( 'is_end_to_end' ) );
		$migrate_settings         = $request->get_param( 'migrate_settings' );
		$migrate_settings['mode'] = 'pull';
		$pre_check_response       = InstaWP_Tools::get_pull_pre_check_response( $migrate_key, $migrate_settings );

		if ( is_wp_error( $pre_check_response ) ) {
			return $this->throw_error( $pre_check_response );
		}

		global $wp_version;

		$pre_check_response['source_domain']       = Helper::wp_site_url( '', true );
		$pre_check_response['php_version']         = PHP_VERSION;
		$pre_check_response['wp_version']          = $wp_version;
		$pre_check_response['plugin_version']      = INSTAWP_PLUGIN_VERSION;
		$pre_check_response['file_size']           = InstaWP_Tools::get_total_sizes( 'files', $migrate_settings );
		$pre_check_response['db_size']             = InstaWP_Tools::get_total_sizes( 'db' );
		$pre_check_response['is_website_on_local'] = instawp_is_website_on_local();
		$pre_check_response['active_plugins']      = Option::get_option( 'active_plugins' );
		$pre_check_response['wp_admin_email']      = get_bloginfo( 'admin_email' );

		Option::update_option(
			'instawp_migration_details',
			array(
				'migrate_key'   => $migrate_key,
				'is_end_to_end' => $is_end_to_end,
				// 'dest_url'    => Helper::get_args_option( 'serve_url', $pre_check_response ),
				'started_at'    => current_time( 'mysql', 1 ),
				'status'        => 'initiated',
				'mode'          => 'pull',
			)
		);

		return $this->send_response( $pre_check_response );
	}

	/**
	 * Handle response for push api
	 *
	 * @param WP_REST_Request $request
	 *
	 * @return WP_REST_Response
	 */
	public function handle_push_api( WP_REST_Request $request ) {

		$response = $this->validate_api_request( $request );
		if ( is_wp_error( $response ) ) {
			return $this->throw_error( $response );
		}

		if ( ! ini_get( 'allow_url_fopen' ) ) {
			return $this->throw_error( new WP_Error( 403, esc_html__( 'Migration could not initiate because the allow_url_fopen is set to false.', 'instawp-connect' ) ) );
		}

		global $wp_version;

		// Create InstaWP backup directory
		InstaWP_Tools::create_instawpbackups_dir();

		// Clean InstaWP backup directory
		InstaWP_Tools::clean_instawpbackups_dir();

		$migrate_key      = Helper::get_random_string( 40 );
		$migrate_settings = InstaWP_Tools::get_migrate_settings( array(), array( 'mode' => 'push' ) );
		$api_signature    = hash( 'sha512', $migrate_key . wp_generate_uuid4() );
		$dest_file_url    = InstaWP_Tools::generate_destination_file( $migrate_key, $api_signature, $migrate_settings, true );
		// Check accessibility of serve file
		if ( empty( $dest_file_url['dest_url'] ) ) {
			return $this->throw_error( new WP_Error( 403, esc_html( $dest_file_url['error'] ) ) );
		}

		$dest_file_url = $dest_file_url['dest_url'];

		$is_end_to_end = sanitize_text_field( $request->get_param( 'is_end_to_end' ) );

		Option::update_option(
			'instawp_migration_details',
			array(
				'migrate_key'   => $migrate_key,
				'is_end_to_end' => $is_end_to_end,
				'dest_url'      => $dest_file_url,
				'started_at'    => current_time( 'mysql', 1 ),
				'status'        => 'initiated',
				'mode'          => 'push',
			)
		);

		$migrate_settings['has_zip_archive'] = class_exists( 'ZipArchive' );
		$migrate_settings['has_phar_data']   = class_exists( 'PharData' );

		return $this->send_response(
			array(
				'php_version'      => PHP_VERSION,
				'wp_version'       => $wp_version,
				'plugin_version'   => INSTAWP_PLUGIN_VERSION,
				'active_plugins'   => Option::get_option( 'active_plugins' ),
				'migrate_settings' => $migrate_settings,
				'migrate_key'      => $migrate_key,
				'dest_url'         => $dest_file_url,
				'api_signature'    => $api_signature,
			)
		);
	}

	/**
	 * Handle response for post migration cleanup api
	 *
	 * @param WP_REST_Request $request
	 *
	 * @return WP_REST_Response
	 */
	public function handle_post_migration_cleanup( WP_REST_Request $request ) {

		try {
			// Flushing db cache after migration
			wp_cache_flush();

			$response = $this->validate_api_request( $request );
			if ( is_wp_error( $response ) ) {
				return $this->throw_error( $response );
			}

			// Sanitize wp-config.php after migration to fix platform-specific paths
			$this->sanitize_wp_config();

			if ( ! function_exists( 'deactivate_plugins' ) ) {
				require_once ABSPATH . 'wp-admin/includes/plugin.php';
			}

			if ( ! function_exists( 'request_filesystem_credentials' ) ) {
				require_once ABSPATH . 'wp-admin/includes/file.php';
			}

			$plugin_slug           = INSTAWP_PLUGIN_SLUG . '/' . INSTAWP_PLUGIN_SLUG . '.php';
			$response              = array(
				'success'       => true,
				'sso_login_url' => Helper::wp_site_url( '', true ),
			);
			$clear_connect         = $request->get_param( 'clear_connect' );
			$clear_connect         = ! in_array( 'clear_connect', array_keys( $request->get_params() ) ) ? true : $clear_connect;
			$delete_connect_plugin = $request->get_param( 'delete_connect_plugin' );
			$delete_connect_plugin = ! in_array( 'delete_connect_plugin', array_keys( $request->get_params() ) ) ? true : $delete_connect_plugin;
			$migrate_group_uuid    = $request->get_param( 'migrate_group_uuid' );
			$migration_status      = $request->get_param( 'status' );
			$migration_details     = Option::get_option( 'instawp_migration_details' );
			$plugins_to_delete     = array();

			$migration_details['migrate_group_uuid']  = $migrate_group_uuid;
			$migration_details['status']              = $migration_status;
			$migration_details['post_cleanup_called'] = true;

			// Option::update_option( 'instawp_last_migration_details', $migration_details );
			// Install the plugins if there is any in the request
			$post_installs = $request->get_param( 'post_installs' );

			if ( ! empty( $post_installs ) && is_array( $post_installs ) ) {
				$installer         = new Helpers\Installer( $post_installs );
				$post_installs_res = $installer->start();

				foreach ( $post_installs_res as $install_res ) {
					if ( ! isset( $install_res['success'] ) || ! $install_res['success'] ) {
						$response['success']            = false;
						$response['post_install_error'] = esc_html__( 'Installation failed', 'instawp-connect' );
						break;
					}
				}

				$response['post_installs'] = $post_installs_res;
			}

			// SSO Url for the Bluehost
			if ( class_exists( 'NewfoldLabs\WP\Module\Migration\Services\MigrationSSO' ) ) {
				$login_url_response = NewfoldLabs\WP\Module\Migration\Services\MigrationSSO::get_magic_login_url();

				if ( $login_url_response instanceof WP_REST_Response && $login_url_response->get_status() === 200 ) {
					$response['sso_login_url'] = $login_url_response->get_data();
				} else {
					$response['success']       = false;
					$response['cleanup_error'] = esc_html__( 'Error getting SSO login url.', 'instawp-connect' );

					error_log( 'sso_url_response: ' . wp_json_encode( $login_url_response ) );
				}
			} else {
				error_log( esc_html__( 'sso_url_class_not_found: This class NewfoldLabs\WP\Module\Migration\Services\MigrationSSO not found.', 'instawp-connect' ) );
			}

			// disable bluehost coming soon notice
			update_option( 'nfd_coming_soon', false );

			$migration_details['status'] = in_array( $migration_status, array( 'aborted', 'failed', 'timeout' ) ) ? $migration_status : 'completed';

			Option::update_option( 'instawp_last_migration_details', $migration_details );

			// reset everything and remove connection
			if ( $clear_connect ) {
				instawp_reset_running_migration( 'hard', true );
			}

			$post_uninstalls = $request->get_param( 'post_uninstalls' );
			$post_uninstalls = ! empty( $post_uninstalls ) ? $post_uninstalls : array();

			foreach ( $post_uninstalls as $post_uninstall_item ) {
				$plugins_to_delete[] = $post_uninstall_item;
			}

			// Adding helper plugins to delete
			foreach ( instawp_mig_excluded_plugins() as $del_helper_plugin ) {
				$plugins_to_delete[] = array(
					'slug'   => $del_helper_plugin . DIRECTORY_SEPARATOR . ( str_replace( '-main', '', $del_helper_plugin ) ) . '.php',
					'type'   => 'plugin',
					'delete' => true,
				);
			}

			// Adding instawp-connect plugin to delete after the migration if delete connect plugin flag is enabled
			if ( $delete_connect_plugin ) {
				$plugins_to_delete[] = array(
					'slug'   => $plugin_slug,
					'type'   => 'plugin',
					'delete' => true,
				);
			}

			// Cleaning up migrations and backup files
			if ( $migration_details['status'] === 'completed' ) {
				InstaWP_Tools::clean_iwp_files_dir();
			}

			foreach ( $plugins_to_delete as $plugin ) {

				$_slug   = InstaWP_Setting::get_args_option( 'slug', $plugin );
				$_delete = (bool) InstaWP_Setting::get_args_option( 'delete', $plugin, false );

				deactivate_plugins( $_slug );

				if ( $_delete ) {
					$is_deleted = delete_plugins( array( $_slug ) );

					if ( is_wp_error( $is_deleted ) ) {
						$response['uninstall'][ $_slug ] = array(
							'slug'    => $_slug,
							'success' => false,
							'message' => $is_deleted->get_error_message(),
						);
					}
				}
			}

			$response['message'] = esc_html__( 'Post migration cleanup completed.', 'instawp-connect' );

			return $this->send_response( $response );
		} catch ( \Throwable $th ) {
			$response = array(
				'success'     => false,
				'message'     => $th->getMessage(),
				'line_number' => $th->getLine(),
				'file'        => $th->getFile(),
				'response'    => $response,
			);
			error_log( 'migration clean up exception: ' . json_encode( $response ) );
			return $this->send_response( $response );
		}
	}

	/**
	 * Sanitize wp-config.php after migration to remove platform-specific paths.
	 *
	 * When sites are migrated from platform-specific hosting (e.g., Bitnami, Plesk, cPanel),
	 * wp-config.php often contains hardcoded paths that don't exist on the destination server,
	 * causing Fatal errors and 504 Gateway Timeouts.
	 *
	 * @return void
	 */
	private function sanitize_wp_config() {
		try {
			$wp_config_path = ABSPATH . 'wp-config.php';
			if ( ! file_exists( $wp_config_path ) ) {
				$wp_config_path = dirname( ABSPATH ) . '/wp-config.php';
			}
			if ( ! file_exists( $wp_config_path ) || ! is_writable( $wp_config_path ) ) {
				return;
			}

			$content = file_get_contents( $wp_config_path );
			if ( empty( $content ) ) {
				return;
			}

			$modified = false;

			// Platform-specific path patterns that indicate a migrated wp-config.
			$platform_patterns = array(
				'/bitnami/',
				'/opt/bitnami/',
				'/app/public/',
				'/srv/htdocs/',
				'/nas/content/',
			);

			// 1. Fix WP_DEBUG_LOG if it points to a non-existent directory.
			if ( preg_match( "/define\s*\(\s*['\"]WP_DEBUG_LOG['\"]\s*,\s*['\"](.+?)['\"]\s*\)/", $content, $matches ) ) {
				$debug_log_path = $matches[1];
				$debug_log_dir  = dirname( $debug_log_path );

				$is_platform_path = false;
				foreach ( $platform_patterns as $pattern ) {
					if ( false !== strpos( $debug_log_path, $pattern ) ) {
						$is_platform_path = true;
						break;
					}
				}

				if ( $is_platform_path || ! is_dir( $debug_log_dir ) ) {
					$content  = preg_replace(
						"/define\s*\(\s*['\"]WP_DEBUG_LOG['\"]\s*,\s*['\"].+?['\"]\s*\)/",
						"define( 'WP_DEBUG_LOG', true )",
						$content
					);
					$modified = true;
				}
			}

			// 2. Remove WP_CONTENT_DIR if it references platform-specific or non-existent paths.
			if ( preg_match( "/define\s*\(\s*['\"]WP_CONTENT_DIR['\"]\s*,\s*['\"](.+?)['\"]\s*\)/", $content, $matches ) ) {
				$content_dir   = $matches[1];
				$should_remove = false;

				foreach ( $platform_patterns as $pattern ) {
					if ( false !== strpos( $content_dir, $pattern ) ) {
						$should_remove = true;
						break;
					}
				}

				// Also remove if the path doesn't exist on this server.
				if ( ! $should_remove && ! is_dir( $content_dir ) ) {
					$should_remove = true;
				}

				if ( $should_remove ) {
					$content  = preg_replace(
						"/define\s*\(\s*['\"]WP_CONTENT_DIR['\"]\s*,\s*['\"].+?['\"]\s*\);\s*\n?/",
						'',
						$content
					);
					$modified = true;
				}
			}

			// Also handle WP_CONTENT_DIR defined with a constant expression using an undefined constant.
			if ( preg_match( "/define\s*\(\s*['\"]WP_CONTENT_DIR['\"]\s*,\s*(?!__DIR__)([A-Z_]+)\s*\.\s*/", $content, $matches ) ) {
				$used_constant = $matches[1];
				// If the constant used is not ABSPATH (defined at the bottom of wp-config)
				// or __DIR__, it will likely cause a fatal error. Remove the definition.
				if ( 'ABSPATH' !== $used_constant && '__DIR__' !== $used_constant ) {
					$content  = preg_replace(
						"/define\s*\(\s*['\"]WP_CONTENT_DIR['\"]\s*,\s*[^)]+\);\s*\n?/",
						'',
						$content
					);
					$modified = true;
				}
			}

			// 3. Remove WP_CONTENT_URL if it references platform-specific paths.
			if ( preg_match( "/define\s*\(\s*['\"]WP_CONTENT_URL['\"]\s*,\s*['\"](.+?)['\"]\s*\)/", $content, $matches ) ) {
				$content_url   = $matches[1];
				$should_remove = false;

				foreach ( $platform_patterns as $pattern ) {
					if ( false !== strpos( $content_url, $pattern ) ) {
						$should_remove = true;
						break;
					}
				}

				if ( $should_remove ) {
					$content  = preg_replace(
						"/define\s*\(\s*['\"]WP_CONTENT_URL['\"]\s*,\s*['\"].+?['\"]\s*\);\s*\n?/",
						'',
						$content
					);
					$modified = true;
				}
			}

			// 4. Remove WP_PLUGIN_DIR / WP_PLUGIN_URL / WPMU_PLUGIN_DIR / WPMU_PLUGIN_URL / UPLOADS
			// if they reference platform-specific paths.
			$plugin_constants = array( 'WP_PLUGIN_DIR', 'WP_PLUGIN_URL', 'WPMU_PLUGIN_DIR', 'WPMU_PLUGIN_URL', 'UPLOADS' );
			foreach ( $plugin_constants as $constant_name ) {
				if ( preg_match( "/define\s*\(\s*['\"]" . $constant_name . "['\"]\s*,\s*['\"](.+?)['\"]\s*\)/", $content, $matches ) ) {
					$path_value = $matches[1];
					foreach ( $platform_patterns as $pattern ) {
						if ( false !== strpos( $path_value, $pattern ) ) {
							$content  = preg_replace(
								"/define\s*\(\s*['\"]" . $constant_name . "['\"]\s*,\s*['\"].+?['\"]\s*\);\s*\n?/",
								'',
								$content
							);
							$modified = true;
							break;
						}
					}
				}
			}

			if ( $modified ) {
				file_put_contents( $wp_config_path, $content );
			}
		} catch ( \Throwable $e ) {
			// Sanitization failure should never break the migration.
			Helper::add_error_log( 'wp-config sanitization error: ' . $e->getMessage(), $e );
		}
	}
}

new InstaWP_Rest_Api_Migration();
