import http from 'http';

import koa from 'koa';
import bodyParser from 'koa-body';
import session from 'koa-session';
import koaRouter from '@koa/router'
import cors from '@koa/cors';

import { groupBy } from 'lodash';
import Bluebird from 'bluebird';

import type Log from 'bunyan';
import type { Listing, User, Want, Prisma } from '@prisma/client';

import { Pg } from './pg';
import routerAuth from './routers/router.auth';
import { Events } from './events';

export default function createApi(log: Log, pg: Pg, discogs, events) {
    const PORT = 41337;
    const SECRET = 'ohja4Eif9eidah3aj5ta2haa4iemooth';

    const app = new koa();
    const server = http.createServer(app.callback());

    app.use(async (ctx, next) => {
        try {
            await next();
        } catch (err) {
            log.error(err);
            ctx.status = err.statusCode || err.status || 500;
            ctx.body = {
                  error: err.message
            };
        }
    });

    const router = koaRouter();

    interface ListingData extends Listing {
        data: any,
        want: { user: User },
    };

    async function getBundles() {
        const bundles = await pg.bundleCandidates();

        return bundles.map((b: ListingData[]) => {
            const total = b.reduce((acc, l) => acc + l.data.original_price.value, 0);

            const items = b.map(l => ({
                id: l.data.id,
                description: l.data.release.description,
                price: l.data.original_price.value,
                currency: l.data.original_price.curr_abbr,
                condition: l.data.condition,
                uri: l.data.uri,
                user: l.want.user,
            }));

            const shipping = b[0]?.data.seller.shipping;

            const bundle = {
                username: b[0]?.data.seller.username,
                seller: b[0]?.data.seller.id,
                shipsFrom: b[0]?.data.ships_from,
                total,
                currency: b[0]?.data.original_price.curr_abbr,
                shipping: '...',
                items,
                mentionsAustralia: shipping.toLowerCase().includes('australia'),
                mentionsWorldwide: shipping.toLowerCase().includes('world'),
            }

            return bundle;
        });
    }


    async function populateUserListings(user: User) {
        const wants = await discogs.wantlist(user);

        // const latest = await discogs.wantlistLatest(user);
        // if (wants.length !== latest.length)

        log.debug({ username: user.discogs, wantCount: wants.length });

        return Bluebird.mapSeries<Want, Listing[]>(wants, async want => {
            const listings = await discogs.listings(want);
            const populated = listings.filter(l => l);
            log.debug({ id: want.id, release: want.release, populated: populated.length, total: listings.length });
            return populated;
        });
    }

    function listen() {
        return new Promise((resolve, reject) => {
            app.on('error', err => {
                reject(err);
            })

            server.listen(PORT, () => {
                log.info('listening', { PORT });
            });
        });
    }

    app.use(cors({ credentials: true }));
    app.use(bodyParser())

    app.keys = [SECRET];
    app.use(session(app));

    const { authRouter, passport } = routerAuth(log, pg);
    app.use(passport.initialize());
    app.use(passport.session())
    app.use(authRouter.routes());

    router.get('/health', async function health(ctx) {
        ctx.status = 200;
    });

    router.get('/bundles', async (ctx, next) => {
        const bundles = await getBundles();
        ctx.response.body = bundles;
    })

    router.get('/user/:id/offers', async function userOffersGet(ctx, next) {
        const { id } = ctx.request.params;
        const user = await pg.userFindId(id);

        ctx.assert(user, 404, `user ${id} not found`);

        const bundles = (await getBundles())
            .map(b => {
                b.items = b.items.filter(i => i.user.id === user.id)
                return b;
            })
            .filter(b => b.items.length);

        ctx.response.body = bundles;
    });

    router.post('/user/populate', async function usersPopulate(ctx, next) {
        const { userId } = ctx.request.body;
        const user = await pg.userFindId(userId);
        const listings = await populateUserListings(user);
        ctx.response.body = listings;
    });

    router.post('/want', async function wantPost(ctx, next) {
        ctx.assert(ctx.isAuthenticated(), 401, 'log in required');
        const { releaseId } = ctx.request.body;
        const user = await pg.userFindId(ctx.state.user.id);
        const release = await discogs.release(releaseId);
        const want = await pg.wantCreate([release], user);

        // fetch listings
        const listings = await discogs.listings(want);

        ctx.response.body = { want, listings };
    });

    router.post('/want/discogs', async function wantListPost(ctx, next) {
        ctx.assert(ctx.isAuthenticated(), 401, 'log in required');
        const { username } = ctx.request.body;
        const user = await pg.userFindId(ctx.state.user.id);

        const wants = await discogs.wantListSync(username, user);

        events.emit(Events.WantsAdded, wants);

        ctx.response.body = wants;
    });

    router.get('/want/all', async function wantGet(ctx, next) {
        ctx.assert(ctx.isAuthenticated(), 401, 'log in required');
        const user = ctx.state.user;
        const wants = await pg.wantList(user);

        ctx.response.body = wants;
    });

    router.post('/want/search', async function wantPost(ctx, next) {
        const { artist, title } = ctx.request.body;
        const results = await discogs.search(artist, title);
        ctx.response.body = results;
    });

    app.use(router.routes());

    return {
        app,
        server,
        listen,
    };
}