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

import { CreateSongEndpointHandler } from './endpoints/CreateSong';
import { CreateArtistEndpointHandler } from './endpoints/CreateArtist';
import { QueryEndpointHandler } from './endpoints/Query';
import { ArtistDetailsEndpointHandler } from './endpoints/ArtistDetails'
import { SongDetailsEndpointHandler } from './endpoints/SongDetails';
import { ModifyArtistEndpointHandler } from './endpoints/ModifyArtist';
import { ModifySongEndpointHandler } from './endpoints/ModifySong';
import { CreateTagEndpointHandler } from './endpoints/CreateTag';
import { ModifyTagEndpointHandler } from './endpoints/ModifyTag';
import { TagDetailsEndpointHandler } from './endpoints/TagDetails';
import { CreateAlbumEndpointHandler } from './endpoints/CreateAlbum';
import { ModifyAlbumEndpointHandler } from './endpoints/ModifyAlbum';
import { AlbumDetailsEndpointHandler } from './endpoints/AlbumDetails';
import { DeleteTagEndpointHandler } from './endpoints/DeleteTag';
import { MergeTagEndpointHandler } from './endpoints/MergeTag';
import { RegisterUserEndpointHandler } from './endpoints/RegisterUser';
import * as endpointTypes from './endpoints/types';
import { sha512 } from 'js-sha512';

// 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.catchUnhandledErrors)
            .catch((_e: endpointTypes.EndpointError) => {
                let e: endpointTypes.EndpointError = _e;
                console.log("Error handling request: ", e.internalMessage);
                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); }
        })();
    });

    app.use(require('express-session')({ secret: 'EA9q5cukt7UFhN', resave: false, saveUninitialized: false }));
    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 REST API endpoints
    app.post(apiBaseUrl + api.CreateSongEndpoint, checkLogin(), _invoke(CreateSongEndpointHandler));
    app.post(apiBaseUrl + api.QueryEndpoint, checkLogin(), _invoke(QueryEndpointHandler));
    app.post(apiBaseUrl + api.CreateArtistEndpoint, checkLogin(), _invoke(CreateArtistEndpointHandler));
    app.put(apiBaseUrl + api.ModifyArtistEndpoint, checkLogin(), _invoke(ModifyArtistEndpointHandler));
    app.put(apiBaseUrl + api.ModifySongEndpoint, checkLogin(), _invoke(ModifySongEndpointHandler));
    app.get(apiBaseUrl + api.SongDetailsEndpoint, checkLogin(), _invoke(SongDetailsEndpointHandler));
    app.get(apiBaseUrl + api.ArtistDetailsEndpoint, checkLogin(), _invoke(ArtistDetailsEndpointHandler));
    app.post(apiBaseUrl + api.CreateTagEndpoint, checkLogin(), _invoke(CreateTagEndpointHandler));
    app.put(apiBaseUrl + api.ModifyTagEndpoint, checkLogin(), _invoke(ModifyTagEndpointHandler));
    app.get(apiBaseUrl + api.TagDetailsEndpoint, checkLogin(), _invoke(TagDetailsEndpointHandler));
    app.post(apiBaseUrl + api.CreateAlbumEndpoint, checkLogin(), _invoke(CreateAlbumEndpointHandler));
    app.put(apiBaseUrl + api.ModifyAlbumEndpoint, checkLogin(), _invoke(ModifyAlbumEndpointHandler));
    app.get(apiBaseUrl + api.AlbumDetailsEndpoint, checkLogin(), _invoke(AlbumDetailsEndpointHandler));
    app.delete(apiBaseUrl + api.DeleteTagEndpoint, checkLogin(), _invoke(DeleteTagEndpointHandler));
    app.post(apiBaseUrl + api.MergeTagEndpoint, checkLogin(), _invoke(MergeTagEndpointHandler));
    app.post(apiBaseUrl + api.RegisterUserEndpoint, _invoke(RegisterUserEndpointHandler));

    app.post('/login', passport.authenticate('local'), (req: any, res: any) => {
        res.status(200).send({ userId: req.user.id });
    });
    app.post('/logout', function (req: any, res: any) {
        req.logout();
        res.status(200).send();
    });
}

export { SetupApp }