import {HTTPKernelModule} from '../HTTPKernelModule'
import {Injectable} from '../../../di'
import {ErrorWithContext} from '../../../util'
import {HTTPKernel} from '../HTTPKernel'
import {Request} from '../../lifecycle/Request'
import {SetSessionCookieHTTPModule} from './SetSessionCookieHTTPModule'
import {SessionFactory} from '../../session/SessionFactory'
import {Session} from '../../session/Session'

/**
 * HTTP kernel middleware that creates the session using the configured driver
 * and loads its data using the request's session cookie.
 */
@Injectable()
export class InjectSessionHTTPModule extends HTTPKernelModule {
    public readonly executeWithBlockingWriteback = true

    public static register(kernel: HTTPKernel): void {
        kernel.register(this).after(SetSessionCookieHTTPModule)
    }

    public async apply(request: Request): Promise<Request> {
        request.registerFactory(request.make(SessionFactory))

        const session = <Session> request.make(Session)
        const id = request.cookies.get('extollo.session')
        if ( !id ) {
            throw new ErrorWithContext('Session ID has not been set. Cannot inject session!')
        }

        session.setKey(id.value)
        await session.load()

        return request
    }
}