import {Request} from "../../http/lifecycle/Request";
import {Injectable} from "../../di"
import {Locale} from "../service/Locale";
import {HTTPKernelModule} from "../../http/kernel/HTTPKernelModule";
import {HTTPKernel} from "../../http/kernel/HTTPKernel";
import {InjectSessionHTTPModule} from "../../http/kernel/module/InjectSessionHTTPModule";
import {Session} from "../../http/session/Session";

/**
 * An HTTP kernel module that adds the Locale service to the request container.
 */
@Injectable()
export class InjectRequestLocale extends HTTPKernelModule {
    public executeWithBlockingWriteback = true

    /** Register this kernel module to the given kernel. */
    public static register(kernel: HTTPKernel) {
        kernel.register(this).after(InjectSessionHTTPModule)
    }

    /**
     * Gets or sets the default locale in the session and instantiates a Locale
     * service into the Request container based on said locale.
     * @param request
     */
    public async apply(request: Request) {
        const session = <Session> request.make(Session)
        const locale = <Locale> request.make(Locale)

        // Set the default locale in the session
        if ( !session.get('i18n.locale') ) {
            session.set('i18n.locale', locale.getDefaultLocale())
        }

        locale.setLocale(session.get('i18n.locale'))
        request.registerSingletonInstance(Locale, locale)

        return request
    }
}