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, sortBy } 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, offers, 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.price.value, 0);
            const items = b.map(l => ({
                id: l.data.id,
                description: l.data.release.description,
                originalPrice: l.data.original_price.value,
                originalCurrency: l.data.original_price.curr_abbr,
                price: l.data.price.value,
                currency: l.data.price.currency,
                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.price.currency,
                shipping: '...',
                items,
                mentionsAustralia: shipping.toLowerCase().includes('australia'),
                mentionsWorldwide: shipping.toLowerCase().includes('world'),
            }

            return bundle;
        });
    }

    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('/acp/bundles', async function bundlesGet(ctx, next) {
        const bundles = await getBundles();
        ctx.response.body = bundles;
    })

    router.get('/acp/offers', async function acpOffers(ctx, next) {
        const offers = await pg.offersAdmin();

        const grouped = groupBy(offers, o => o.listing.data.seller.id);

        const bundles = sortBy(Object.values(grouped).map(offers => {
            const shipping = offers[0]?.listing.data.seller.shipping;
            const bundle = {
                username: offers[0]?.listing.data.seller.username,
                seller: offers[0]?.listing.data.seller.id,
                shipsFrom: offers[0]?.listing.data.ships_from,
                shipping,
                offers,
                mentionsAustralia: shipping.toLowerCase().includes('australia'),
                mentionsWorldwide: shipping.toLowerCase().includes('world'),
            }

            return bundle;
        }), bundle => -bundle.offers.length);

        ctx.response.body = bundles;
    })

    router.post('/offers', async function postOffers(ctx, next) {
        const { listingIds, shipping, baseShipping } = ctx.request.body;

        ctx.assert(listingIds.length, 400, 'listingIds required');
        ctx.assert([listingIds, shipping, baseShipping].every(i => i), 400, 'listingIds, shipping, baseShipping required');

        ctx.response.body = await offers.generate(listingIds, shipping, baseShipping);
    })

    router.post('/offer/accept', async function postOffers(ctx, next) {
        ctx.assert(ctx.isAuthenticated(), 401, 'log in required');
        ctx.response.body = await offers.accept(ctx);
    })

    router.get('/user/offers', async function userOffersGet(ctx, next) {
        ctx.assert(ctx.isAuthenticated(), 401, 'log in required');
        const user = ctx.state.user;
        const offers = await pg.userOffers(user);
        ctx.response.body = offers;
    });

    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);
        events.emit(Events.WantsAdded, [want]);
        ctx.response.body = [want];
    });

    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;
    });

    router.post('/auth/logout', async (ctx, next) => {
        ctx.assert(ctx.isAuthenticated(), 401, 'log in required');
        ctx.logout();
        ctx.status = 200;
        ctx.body = { success: true };
    });

    app.use(router.routes());

    return {
        app,
        server,
        listen,
    };
}