import { AConfigChecker } from './src/AConfigChecker';
import * as express from 'express';
import { AddressInfo } from "net";
import * as path from 'path';
import * as bodyParser from 'body-parser';
const i18next = require('i18next'); // FIXME import from
const i18nextMiddleware = require('i18next-http-middleware'); // FIXME import from
const resourcesToBackend = require('i18next-resources-to-backend'); // FIXME import from
import route_index from './routes/index';
import route_login from './routes/login';
import route_calendar from './routes/calendar';
import route_trombinoscope from './routes/trombinoscope';
import route_accounting from './routes/accounting';
import Security from './src/Security';
import { Session, SessionManager } from './src/Session';
import UserConnectorFactory, { IUserConnector } from './src/UserConnector/UserConnectorFactory';
import DBConnectorFactory from './src/DbConnector/DBConnectorFactory';

const debug = require('debug')('my express app');
const app = express();

declare global {
    namespace Express {
        interface Request {
            mSession: Session
            mCookies: Map<string, string>
            t: (s: string) => string // i18n translation function
        }

        interface Response {
            i18next: any
            renderWithTranslations: (translationNs: string, renderView: string, args: any) => Promise<void>
		}
	}
}

// Check config
(async _ => {
    await i18next.use(i18nextMiddleware.LanguageDetector)
        .use(resourcesToBackend((language: string, namespace: string, callback: Function) => {
            import(`./locales/${language}/${namespace}.json`)
                .then((resources) => {
                    callback(null, resources)
                })
                .catch((error) => {
                    callback(error, null)
                })
        }))
        .init({
            preload: ['fr', 'en'],
            nonExplicitSupportedLngs: true,
            lowerCaseLng: true
        });

    let cc: AConfigChecker[] = [
        UserConnectorFactory,
        await DBConnectorFactory.GetConnector()
    ];
    for (let i of cc) {
        let err: Promise<void> | Error | null = i.CheckConfig();
        let errResult: Error | null = null;
        try {
            if (err instanceof Promise)
                await err;
            else
                errResult = err;
        }
        catch (_err) {
            errResult = _err;
        }
        if (errResult !== null) {
            console.error("Configuration error: " + i.constructor.name +": "+ errResult.message);
            throw "Configuration error";
        }
    }

    // view engine setup
    app.set('views', [path.join(__dirname, 'views'), path.join(__dirname, 'views/template')]);
    app.set('view engine', 'pug');

    app.use(express.static(path.join(__dirname, 'public')));
    app.use(bodyParser.json());
    app.use(bodyParser.urlencoded({ extended: true }));
    app.use(i18nextMiddleware.handle(i18next, {
        ignoreRoutes: [] // or function(req, res, options, i18next) { /* return true to ignore */ }
    }));

    // Security and session setup
    app.use((req: express.Request, res: express.Response, next) => {
        res.i18next = i18next;
        res.renderWithTranslations = async (translationNs: string, renderView: string, args: any) => {
            await i18next.loadNamespaces(translationNs);
            i18next.setDefaultNamespace(translationNs);
            args = args || {};
            args["t"] = req.t;
            res.render(renderView, args);
        };

        req.mCookies = new Map();
        (req.headers?.cookie || "").split(";").forEach(i => {
            let keyValue = i.split("=", 2);
            req.mCookies.set(keyValue[0].trim(), keyValue[1].trim());
        });
        req.mSession = SessionManager.GetSession(req);
        if (req.mSession.IsValid())
            req.mSession.Ping();
        if (req.query["API_KEY"]) {
            Security.TryLoginApiKey(req.query["API_KEY"].toString()).then(user => {
                req.mSession.Login(user);
            })
                .catch(e => {
                    let err: any = new Error("Access denied");
                    err['status'] = 403;
                    next(err);
                    return;
                });
        }
        next();
    });

    let HasAccount = await UserConnectorFactory.GetConnector().HasUsers();

    // Anonymous pages
    !HasAccount && app.use(async (req, res, next) => {
        HasAccount = HasAccount || await UserConnectorFactory.GetConnector().HasUsers();
        if (HasAccount) {
            next();
            return;
        }
        let connector: IUserConnector = UserConnectorFactory.GetConnector();
        if (!connector.CanCreateAccount()) {
            res.end("No account defined, and cannot create account from Connector Backend");
            return;
		}
        if (req.method.toUpperCase() === "POST" && (req.body["username"] || "").trim().length && (req.body["password"] || "").trim().length) {
            let user = await connector.CreateAccount(req.body["username"].trim(), req.body["password"].trim());
            req.mSession.Login(user);
            HasAccount = true;
            SessionManager.Write(res, req.mSession);
            res.redirect(302, "/");
            return;
        }
        if (req.method.toUpperCase() === "GET") {
            res.render('setup_user');
		}
    });
    app.use('/', route_index);
    app.use('/login', route_login);

    // Login check
    app.use((req, res, next) => {
        if (!req.mSession.IsValid())
            res.redirect(302, '/login?redirect=' + encodeURIComponent(req.url));
        else
            next();
    });
    // Any following routes need login
    app.use('/calendar', route_calendar);
    app.use('/trombinoscope', route_trombinoscope);
    app.use('/accounting', route_accounting);

    // catch 404 and forward to error handler
    app.use((_, __, next) => {
        const err: any = new Error('Not Found');
        err['status'] = 404;
        next(err);
    });
    // error handlers

    // development error handler
    // will print stacktrace
    if (app.get('env') === 'development') {
        app.use((err: any, req: Express.Request, res: any, next: any) => { // eslint-disable-line @typescript-eslint/no-unused-vars
            err && console.error(err);
            res.status(err['status'] || 500);
            res.render('error', {
                message: err.message,
                error: err
            });
        });
    }

    // production error handler
    // no stacktraces leaked to user
    app.use((err: any, _: any, res: any, __: any) => { // eslint-disable-line @typescript-eslint/no-unused-vars
        err && console.error(err);
        res.status(err.status || 500);
        res.render('error', {
            message: err.message,
            error: {}
        });
    });

    app.set('port', process.env.port || 1337);

    const server = app.listen(app.get('port'), function () {
        debug(`Express server listening on port ${(server.address() as AddressInfo).port}`);
    });
})();