import {HTTPKernelModule} from '../HTTPKernelModule'
import {ResponseObject} from '../../routing/Route'
import {Request} from '../../lifecycle/Request'
import {plaintext} from '../../response/StringResponseFactory'
import {ResponseFactory} from '../../response/ResponseFactory'
import {json} from '../../response/JSONResponseFactory'
import {UniversalPath} from '../../../util'
import {file} from '../../response/FileResponseFactory'

/**
 * Base class for HTTP kernel modules that apply some response from a route handler to the request.
 */
export abstract class AbstractResolvedRouteHandlerHTTPModule extends HTTPKernelModule {
    /**
     * Given a response object, write the response to the request in the appropriate format.
     * @param object
     * @param request
     * @protected
     */
    protected async applyResponseObject(object: ResponseObject, request: Request): Promise<void> {
        if ( (typeof object === 'string') || (typeof object === 'number') ) {
            object = plaintext(String(object))
        }

        if ( object instanceof ResponseFactory ) {
            await object.write(request)
        } else if ( object instanceof UniversalPath ) {
            await file(object).write(request)
        } else if ( typeof object !== 'undefined' ) {
            await json(object).write(request)
        } else {
            await plaintext('').write(request)
        }
    }
}