<?php

namespace WPMedia\BackWPup\Backups\API;

use WPMedia\BackWPup\Adapters\BackWPupAdapter;
use WPMedia\BackWPup\Adapters\OptionAdapter;
use WPMedia\BackWPup\Adapters\JobAdapter;
use WPMedia\BackWPup\Adapters\FileAdapter;
use WPMedia\BackWPup\Adapters\JobTypesAdapter;
use WPMedia\BackWPup\Backup\Database as BackupDatabase;
use WP_HTTP_Response;
use WP_REST_Request;
use WP_REST_Response;
use Exception;
use WPMedia\BackWPup\API\Rest as RestInterface;


class Rest implements RestInterface {
	/**
	 * BackWPupAdapter instance.
	 *
	 * @var BackWPupAdapter
	 */
	private $backwpup_adapter;

	/**
	 * Option adapter instance.
	 *
	 * @var OptionAdapter
	 */
	private $option_adapter;

	/**
	 * JobAdapter instance.
	 *
	 * @var JobAdapter
	 */
	private $job_adapter;

	/**
	 * FileAdapter instance.
	 *
	 * @var FileAdapter
	 */
	private $file_adapter;

	/**
	 * JobTypesAdapter instance.
	 *
	 * @var JobTypesAdapter
	 */
	private $job_types_adapter;

	/**
	 * Backup database instance.
	 *
	 * @var BackupDatabase
	 */
	private $backup_database;

	/**
	 * Constructor.
	 *
	 * @param BackWPupAdapter $backups_adapter
	 * @param OptionAdapter   $option_adapter
	 * @param JobAdapter      $job_adapter
	 * @param FileAdapter     $file_adapter
	 * @param JobTypesAdapter $job_types_adapter
	 * @param BackupDatabase  $backup_database
	 */
	public function __construct(
		BackWPupAdapter $backups_adapter,
		OptionAdapter $option_adapter,
		JobAdapter $job_adapter,
		FileAdapter $file_adapter,
		JobTypesAdapter $job_types_adapter,
		BackupDatabase $backup_database
	) {
		$this->backwpup_adapter  = $backups_adapter;
		$this->option_adapter    = $option_adapter;
		$this->job_adapter       = $job_adapter;
		$this->file_adapter      = $file_adapter;
		$this->job_types_adapter = $job_types_adapter;
		$this->backup_database   = $backup_database;
	}

	/**
	 * Checks if the current user has the necessary permissions to perform the action.
	 *
	 * @return bool True if the user has permission, false otherwise.
	 */
	public function has_permission(): bool {
		return current_user_can( 'backwpup' );
	}

	/**
	 * Registers the REST API routes for the Backups API.
	 *
	 * This method is responsible for defining the endpoints and their
	 * corresponding callbacks for the Backups API within the BackWPup Pro plugin.
	 *
	 * @return void
	 */
	public function register_routes(): void {
		register_rest_route(
			'backwpup/v1',
			'/job-abort-status',
			[
				'methods'             => 'GET',
				'callback'            => [ $this, 'get_job_abort_status' ],
				'permission_callback' => [ $this, 'has_permission' ],
				'args'                => [
					'job_id' => [
						'required'          => true,
						'validate_callback' => function ( $param ) {
							return is_numeric( $param ) && $param > 0;
						},
						'sanitize_callback' => 'absint',
					],
				],
			]
		);

		register_rest_route(
			'backwpup/v1',
			'/startbackup',
			[
				'methods'             => 'POST',
				'callback'            => [ $this, 'start_backup' ],
				'permission_callback' => [ $this, 'has_permission' ],
				'args'                => [
					'job_id'       => [
						'required'          => false,
						'validate_callback' => function ( $param ) {
							return is_numeric( $param ) && $param > 0;
						},
						'sanitize_callback' => 'absint',
					],
					'first_backup' => [
						'required'          => false,
						'validate_callback' => function ( $param ) {
							return filter_var( $param, FILTER_VALIDATE_BOOLEAN );
						},
						'sanitize_callback' => function ( $param ) {
							return filter_var( $param, FILTER_VALIDATE_BOOLEAN );
						},
					],
				],
			]
		);

		register_rest_route(
			'backwpup/v1',
			'/process_bulk_actions',
			[
				'methods'             => 'POST',
				'callback'            => [ $this, 'process_bulk_actions' ],
				'permission_callback' => [ $this, 'has_permission' ],
				'args'                => [
					'action'  => [
						'required'          => true,
						'validate_callback' => function ( $param ) {
							return in_array( $param, [ 'delete' ], true );
						},
						'sanitize_callback' => 'sanitize_text_field',
					],
					'backups' => [
						'required'          => true,
						'validate_callback' => function ( $param ) {
							return is_array( $param ) && ! empty( $param );
						},
					],
				],
			]
		);
	}

	/**
	 * Starts the backup process.
	 *
	 * This function is triggered by a WP REST API request to initiate a backup.
	 * If a job ID is provided, it will start the backup for that job. Otherwise, it will start the backup for the file job.
	 *
	 * @param WP_REST_Request $request
	 * @return WP_REST_Response|WP_Error|WP_HTTP_Response The response object on success, or WP_Error on failure.
	 */
	public function start_backup( WP_REST_Request $request ) {
		$params = $request->get_params();

		if ( ! empty( $params['first_backup'] ) ) {
			if ( false === get_site_transient( 'backwpup_first_backup' ) ) {
				set_site_transient( 'backwpup_first_backup', true, HOUR_IN_SECONDS );
			} else {
				return new WP_REST_Response(
					[
						'status' => 301,
						'url'    => network_admin_url( 'admin.php?page=backwpup' ),
					],
					200,
					[ 'Content-Type' => 'text/json' ]
				);
			}
		}

		$create_backup_now_job = true;
		$jobs                  = $this->job_adapter->get_jobs();
		foreach ( $jobs as $job ) {
			if (
				isset( $job['backup_now'] ) && true === $job['backup_now']
				&& ! empty( $job['activetype'] )
			) {
				$create_backup_now_job = false;
			}
		}

		$jobid = $params['job_id'] ?? false;
		if ( $create_backup_now_job && false === $jobid ) {
			$jobid = $this->get_job_id_when_no_available_job();
		}

		// check temp folder.
		$temp_folder_message = $this->file_adapter->check_folder( $this->backwpup_adapter->get_plugin_data( 'TEMP' ), true );
		if ( ! empty( $temp_folder_message ) ) {
			return new WP_HTTP_Response(
				[
					'status'  => 500,
					'message' => $temp_folder_message,
				],
				200,
				[ 'Content-Type' => 'text/json' ]
			);
		}

		// check log folder.
		$log_folder         = get_site_option( 'backwpup_cfg_logfolder' );
		$log_folder         = $this->file_adapter->get_absolute_path( $log_folder );
		$log_folder_message = $this->file_adapter->check_folder( $log_folder );
		if ( ! empty( $log_folder_message ) ) {
			return new WP_HTTP_Response(
				[
					'status'  => 500,
					'message' => $log_folder_message,
				],
				200,
				[ 'Content-Type' => 'text/json' ]
			);
		}

		// check backup destinations.
		$job_types    = $this->backwpup_adapter->get_job_types();
		$job_data     = $this->option_adapter->get_job( $jobid );
		$creates_file = false;
		foreach ( $job_types as $id => $job_type_class ) {
			if ( in_array( $id, $job_data['type'], true ) && $job_type_class->creates_file() ) {
				$creates_file = true;
				break;
			}
		}
		if ( $creates_file ) {
			$destinations = 0;
			foreach ( $job_data['destinations'] as $dest_key ) {
				$dest = $this->backwpup_adapter->get_destination( $dest_key );
				if ( ! $dest || ! $dest->can_run( $job_data, false ) ) {
					continue;
				}
				++$destinations;
			}

			if ( ! $destinations ) {
				return new WP_HTTP_Response(
					[
						'status'  => 500,
						// translators: %s: Job name.
						'message' => sprintf( __( 'No backup destination available for "%s" or properly configured!', 'backwpup' ), esc_attr( $job_data['name'] ) ),
					],
					200,
					[ 'Content-Type' => 'text/json' ]
				);
			}
		}

		// check if wp cron is working.
		$current_time    = time() - HOUR_IN_SECONDS;
		$next_cron_times = array_keys( _get_cron_array() );
		sort( $next_cron_times );
		if ( isset( $next_cron_times[0] ) && $next_cron_times[0] < $current_time ) {
			\BackWPup_Admin::message( __( 'WP-Cron does not seem to be working properly, because it has not run in the last hour. Please check your server settings.', 'backwpup' ), true );
		}

		$this->job_adapter->get_jobrun_url( 'runnow', $jobid );

		sleep( 1 ); // Wait for the job to start.
		$start_file_name = trailingslashit( $this->backwpup_adapter->get_plugin_data( 'TEMP' ) ) . '.backwpup_job_started';
		if ( file_exists( $start_file_name ) ) {
			wp_delete_file( $start_file_name );
		} else {
			return new WP_HTTP_Response(
				[
					'status'  => 500,
					'message' => __( 'The backup process could not be started! Please try to contact our support.', 'backwpup' ),
				],
				200,
				[ 'Content-Type' => 'text/json' ]
			);
		}

		if ( file_exists( $this->backwpup_adapter->get_plugin_data( 'running_file' ) ) ) {
			return new WP_HTTP_Response(
				[
					'status'  => 200,
					// translators: %s: Job name.
					'message' => sprintf( __( 'Job "%s" started.', 'backwpup' ), esc_attr( $job_data['name'] ) ),
				],
				200,
				[ 'Content-Type' => 'text/json' ]
			);
		}

		return new WP_HTTP_Response(
			[
				'status'  => 201,
				// translators: %s: Job name.
				'message' => sprintf( __( 'Job "%s" executed.', 'backwpup' ), esc_attr( $job_data['name'] ) ),
			],
			200,
			[ 'Content-Type' => 'text/json' ]
		);
	}

	/**
	 * Start backup process for when jobs are deleted
	 *
	 * @return int
	 */
	private function get_job_id_when_no_available_job(): int {
		$job_id = get_site_option( 'backwpup_backup_now_job_id', 0 );
		if ( $job_id < 1 ) {
			$job_id = $this->option_adapter->next_job_id();
			update_site_option( 'backwpup_backup_now_job_id', $job_id );
			$this->option_adapter->update( $job_id, 'type', $this->job_types_adapter->get_type_job_both() );
		}

		$this->backup_now_default_values( $job_id, true );

		return $job_id;
	}

	/**
	 * Generate backup default values
	 *
	 * @param int  $next_job_id The next job id.
	 * @param bool $backup_now Check if it's a temp job or back up now.
	 *
	 * @return void
	 */
	private function backup_now_default_values( int $next_job_id, bool $backup_now = false ): void {
		$backup_now_job_values = [
			'jobid'              => $next_job_id,
			'name'               => 'Backup Now',
			'destinations'       => [ 'FOLDER' ],
			'activetype'         => '',
			'backupsyncnodelete' => false,
			'tempjob'            => true,
		];

		if ( $backup_now ) {
			$backup_now_job_values['tempjob']    = false;
			$backup_now_job_values['backup_now'] = true;
		}

		$default_values                    = $this->option_adapter->defaults_job();
		$default_destination_folder_values = $this->backwpup_adapter->get_destination( 'FOLDER' )->option_defaults();

		$bwp_job_values = array_merge( $default_values, $default_destination_folder_values, $backup_now_job_values );

		foreach ( $bwp_job_values as $key => $value ) {
			$this->option_adapter->update( $next_job_id, $key, $value );
		}
	}

	/**
	 * Process bulk actions.
	 *
	 * @param WP_REST_Request $request The REST request object containing the parameters.
	 *
	 * @return WP_REST_Response The response object containing the status and message.
	 *
	 * @throws Exception If an error occurs during the process.
	 */
	public function process_bulk_actions( WP_REST_Request $request ): \WP_REST_Response {
		$params   = $request->get_params();
		$response = [
			'success' => [],
			'errors'  => [],
		];
		$action   = $params['action'];
		switch ( $action ) {
			case 'delete':
				$backups = $params['backups'];
				foreach ( $backups as $backup ) {
					try {
						$backup_id = 0;
						if ( ! empty( $backup['dataset'] ) && is_array( $backup['dataset'] ) && ! empty( $backup['dataset']['backup_id'] ) ) {
							$backup_id = (int) $backup['dataset']['backup_id'];
						}
						if ( $backup_id > 0 ) {
							$this->delete_failed_backup_entry( $backup_id );
						} else {
							$this->delete_backup( $backup );
						}
						$response['success'][] = $backup;
					} catch ( Exception $e ) {
						$response['errors'][] = [
							'backup' => $backup,
							'error'  => $e->getMessage(),
						];
					}
				}
				$response['message'] = __( 'Bulk action processed.', 'backwpup' );
				break;
		}

		return rest_ensure_response( $response );
	}

	/**
	 * Delete a single backup.
	 *
	 * @param array $backup The backup data.
	 *
	 * @throws Exception If an error occurs during deletion.
	 */
	private function delete_backup( $backup ) {
		if ( empty( $backup['dataset']['data-url'] ) ) {
			throw new Exception( __( 'Invalid backup data.', 'backwpup' ) ); // @phpcs:ignore
		}

		// Parse the dataset URL.
		$query = wp_parse_url( $backup['dataset']['data-url'], PHP_URL_QUERY );
		parse_str( $query, $params );

		// Validate required params.
		if ( empty( $params['jobdest-top'] ) || empty( $params['backupfiles'] ) ) {
			throw new Exception( __( 'Missing required parameters.', 'backwpup' ) ); // @phpcs:ignore
		}

		$jobdest = sanitize_text_field( $params['jobdest-top'] );
		$file    = esc_attr( $params['backupfiles'][0] ); // Handle array format.

		[$jobid, $dest] = explode( '_', $jobdest );
		$dest_class     = $this->backwpup_adapter->get_destination( $dest );

		if ( ! $dest_class ) {
			throw new Exception( __( 'Invalid destination class.', 'backwpup' ) ); // @phpcs:ignore
		}

		// Perform the deletion.
		$dest_class->file_delete( $jobdest, $file );

		/**
		 * Fires after deleting backups.
		 *
		 * @param array $params['backupfiles'] Backup file deleted.
		 * @param string $dest Destination.
		 */
		do_action( 'backwpup_after_delete_backups', $params['backupfiles'], $dest );
	}

	/**
	 * Get the abort status of a running or recently-aborted backup job.
	 *
	 * Polls the database to determine whether the background PHP process has
	 * finished its cleanup after the user triggered an abort. The JS abort
	 * handler calls this endpoint repeatedly until `is_done` is true before
	 * redirecting or reloading the page, ensuring the DB row status is already
	 * updated from `created` to `aborted` when the history table is rendered.
	 *
	 * @param WP_REST_Request $request The REST request containing `job_id`.
	 *
	 * @return WP_REST_Response Response with `is_done` boolean flag.
	 */
	public function get_job_abort_status( WP_REST_Request $request ): WP_REST_Response {
		$job_id = (int) $request->get_param( 'job_id' );
		return rest_ensure_response( [ 'is_done' => $this->backup_database->is_abort_complete( $job_id ) ] );
	}

	/**
	 * Delete a failed backup entry from the database.
	 *
	 * @param int $backup_id Backup entry ID.
	 *
	 * @throws Exception When deletion fails.
	 */
	private function delete_failed_backup_entry( int $backup_id ): void {
		if ( $backup_id <= 0 ) {
			throw new Exception( __( 'Invalid failed backup entry.', 'backwpup' ) ); // @phpcs:ignore
		}

		$row = $this->backup_database->get_backup_row_by_id( $backup_id );

		if ( ! $this->backup_database->delete_failed_backup( $backup_id ) ) {
			throw new Exception( __( 'Failed to delete backup entry.', 'backwpup' ) ); // @phpcs:ignore
		}

		// For aborted backups, physically delete any partial file from the destination
		// so it cannot re-appear as a "completed" backup after the DB row is removed.
		if (
			$row
			&& 'aborted' === ( $row->status ?? '' )
			&& ! empty( $row->filename )
			&& ! empty( $row->destination )
		) {
			$destination = (string) $row->destination;
			$filename    = (string) $row->filename;
			$job_id      = isset( $row->job_id ) ? (int) $row->job_id : 0;
			$dest_class  = $this->backwpup_adapter->get_destination( $destination );
			if ( $dest_class && $job_id > 0 ) {
				$jobdest   = $job_id . '_' . $destination;
				$file_path = $this->find_remote_file_path( $dest_class, $jobdest, $filename );
				if ( '' !== $file_path ) {
					try {
						$dest_class->file_delete( $jobdest, $file_path );
					} catch ( \Throwable $e ) {
						// Remote file deletion is best-effort; the DB row is already removed.
						// Log so operators can identify orphaned partial files.
						error_log( sprintf( '[BackWPup] Failed to delete partial aborted file "%s": %s', $filename, $e->getMessage() ) ); // phpcs:ignore WordPress.PHP.DevelopmentFunctions.error_log_error_log
					}
				}
			}
		}
	}

	/**
	 * Find the destination-specific file path or ID for a given base filename.
	 *
	 * Different destinations store files with different keys in their file lists:
	 * FTP stores full remote paths, Google Drive stores file IDs, Azure stores blob names.
	 * This method looks up the entry matching the base filename and returns the value
	 * expected by file_delete(). If the file is not found (e.g. early abort with no
	 * upload), an empty string is returned so deletion can be skipped entirely, avoiding
	 * spurious admin error notices.
	 *
	 * @param \BackWPup_Destinations $dest_class Destination handler instance.
	 * @param string                 $jobdest    Job-destination key (e.g. '123_FTP').
	 * @param string                 $filename   Base archive filename to look for.
	 *
	 * @return string The file path or ID to pass to file_delete(), or '' if not found.
	 */
	private function find_remote_file_path( $dest_class, string $jobdest, string $filename ): string {
		$file_list = $dest_class->file_get_list( $jobdest );
		foreach ( $file_list as $file ) {
			if ( ! is_array( $file ) ) {
				continue;
			}
			$file_key  = (string) ( $file['file'] ?? '' );
			$file_name = (string) ( $file['filename'] ?? basename( $file_key ) );
			if ( $file_name === $filename || $file_key === $filename ) {
				return $file_key;
			}
		}
		return '';
	}
}
