const bodyParser = require('body-parser');
import * as api from '../client/src/api/api';
import Knex from 'knex';

import { importExportEndpoints } from './endpoints/ImportExport';
import { queryEndpoints } from './endpoints/Query';
import { artistEndpoints } from './endpoints/Artist';
import { albumEndpoints } from './endpoints/Album';
import { trackEndpoints } from './endpoints/Track';
import { tagEndpoints } from './endpoints/Tag';
import { integrationEndpoints } from './endpoints/Integration';
import { userEndpoints } from './endpoints/User';

import * as endpointTypes from './endpoints/types';
import { sha512 } from 'js-sha512';
import { createIntegrations } from './integrations/integrations';

// For authentication
var passport = require('passport');
var Strategy = require('passport-local').Strategy;

const invokeHandler = (handler: endpointTypes.EndpointHandler, knex: Knex) => {
    return async (req: any, res: any) => {
        console.log("Incoming", req.method, " @ ", req.url);
        await handler(req, res, knex)
            .catch(endpointTypes.handleErrorsInEndpoint)
            .catch((_e: endpointTypes.EndpointError) => {
                let e: endpointTypes.EndpointError = _e;
                console.log("Error handling request: ", e.message);
                res.sendStatus(e.httpStatus);
            })
        console.log("Finished handling", req.method, "@", req.url);
    };
}

const SetupApp = (app: any, knex: Knex, apiBaseUrl: string) => {
    app.use(bodyParser.json());
    app.use(bodyParser.urlencoded({ extended: true }));

    // Set up auth. See: https://github.com/passport/express-4.x-local-example.git
    passport.use(new Strategy(
        function (email: string, password: string, cb: any) {
            (async () => {
                try {
                    const user = await knex.select(['email', 'passwordHash', 'id'])
                        .from('users')
                        .where({ 'email': email })
                        .then((users: any) => users[0]);
                    if (!user) { cb(null, false); }
                    if (sha512(password) != user.passwordHash) {
                        return cb(null, false);
                    }
                    return cb(null, user);
                } catch (error) { cb(error); }
            })();
        }));
    passport.serializeUser(function (user: any, cb: any) {
        cb(null, user.id);
    });
    passport.deserializeUser(function (id: number, cb: any) {
        (async () => {
            try {
                const user = await knex.select(['email', 'passwordHash', 'id'])
                    .from('users')
                    .where({ 'id': id })
                    .then((users: any) => users[0]);
                if (!user) { cb(null, false); }
                return cb(null, user);
            } catch (error) { cb(error); }
        })();
    });

    var session = require('express-session')
    var MemoryStore = require('memorystore')(session)
    app.use(session({
        secret: 'EA9q5cukt7UFhN',
        resave: false,
        saveUninitialized: false,
        cookie: { maxAge: 86400000 }, //24h
        store: new MemoryStore({
            checkPeriod: 86400000, //24h
        }),
    }));
    app.use(passport.initialize());
    app.use(passport.session());

    const _invoke = (handler: endpointTypes.EndpointHandler) => {
        return invokeHandler(handler, knex);
    }

    const checkLogin = () => {
        return function (req: any, res: any, next: any) {
            if (!req.isAuthenticated || !req.isAuthenticated()) {
                return res
                    .status(401)
                    .json({ reason: "NotLoggedIn" })
                    .send();
            }
            next();
        }
    }

    // Set up integration proxies
    app.use('/integrations', checkLogin(), createIntegrations(knex));

    // Set up auth endpoints
    app.post(apiBaseUrl + api.LoginEndpoint, passport.authenticate('local'), (req: any, res: any) => {
        res.status(200).send({ userId: req.user.id });
    });
    app.post(apiBaseUrl + api.LogoutEndpoint, function (req: any, res: any) {
        req.logout();
        res.status(200).send();
    });

    // Set up other endpoints
    [
        albumEndpoints,
        artistEndpoints,
        tagEndpoints,
        trackEndpoints,
        integrationEndpoints,
        userEndpoints,
        queryEndpoints,
        importExportEndpoints,
    ].forEach((endpoints: [string, string, boolean, endpointTypes.EndpointHandler][]) => {
        endpoints.forEach((endpoint: [string, string, boolean, endpointTypes.EndpointHandler]) => {
            let [url, method, authenticated, handler] = endpoint;
            if (authenticated) {
                app[method](apiBaseUrl + url, checkLogin(), _invoke(handler));
            } else {
                app[method](apiBaseUrl + url, _invoke(handler));
            }
        })
    });
}

export { SetupApp }