import {ResponseFactory} from './ResponseFactory'
import {HTTPStatus} from '../../util'
import {Request} from '../lifecycle/Request'
import {Routing} from '../../service/Routing'

/**
 * Helper function to create a new RouteResponseFactory to the given destination.
 * @param nameOrPath
 */
export function route(nameOrPath: string): RouteResponseFactory {
    return new RouteResponseFactory(nameOrPath)
}

/**
 * Response factory that sends an HTTP redirect to the given destination.
 */
export class RouteResponseFactory extends ResponseFactory {
    protected targetStatus: HTTPStatus = HTTPStatus.MOVED_TEMPORARILY

    constructor(
        /** The alias or path of the route to redirect to. */
        public readonly nameOrPath: string,
    ) {
        super()
    }

    public async write(request: Request): Promise<Request> {
        const routing = <Routing> request.make(Routing)
        request = await super.write(request)

        try {
            const routePath = routing.getNamedPath(this.nameOrPath)
            request.response.setHeader('Location', routePath.toRemote)
        } catch (e: unknown) {
            request.response.setHeader('Location', routing.getAppUrl().concat(this.nameOrPath).toRemote)
        }

        return request
    }
}