/**
 * API Server
 */

import Koa from 'koa';
import Router from '@koa/router';
import multer from '@koa/multer';
import bodyParser from 'koa-bodyparser';
import cors from '@koa/cors';

import { Instances, AccessTokens, Users } from '@/models/index.js';
import config from '@/config/index.js';
import endpoints from './endpoints.js';
import { handler } from './api-handler.js';
import signup from './private/signup.js';
import signin from './private/signin.js';
import signupPending from './private/signup-pending.js';
import discord from './service/discord.js';
import github from './service/github.js';
import twitter from './service/twitter.js';

// Init app
const app = new Koa();

app.use(cors({
	origin: '*',
}));

// No caching
app.use(async (ctx, next) => {
	ctx.set('Cache-Control', 'private, max-age=0, must-revalidate');
	await next();
});

app.use(bodyParser({
	// リクエストが multipart/form-data でない限りはJSONだと見なす
	detectJSON: ctx => !ctx.is('multipart/form-data'),
}));

// Init multer instance
const upload = multer({
	storage: multer.diskStorage({}),
	limits: {
		fileSize: config.maxFileSize || 262144000,
		files: 1,
	},
});

// Init router
const router = new Router();

/**
 * Register endpoint handlers
 */
for (const endpoint of endpoints) {
	if (endpoint.meta.requireFile) {
		router.post(`/${endpoint.name}`, upload.single('file'), handler.bind(null, endpoint));
	} else {
		// 後方互換性のため
		if (endpoint.name.includes('-')) {
			router.post(`/${endpoint.name.replace(/-/g, '_')}`, handler.bind(null, endpoint));

			if (endpoint.meta.allowGet) {
				router.get(`/${endpoint.name.replace(/-/g, '_')}`, handler.bind(null, endpoint));
			} else {
				router.get(`/${endpoint.name.replace(/-/g, '_')}`, async ctx => { ctx.status = 405; });
			}
		}

		router.post(`/${endpoint.name}`, handler.bind(null, endpoint));

		if (endpoint.meta.allowGet) {
			router.get(`/${endpoint.name}`, handler.bind(null, endpoint));
		} else {
			router.get(`/${endpoint.name}`, async ctx => { ctx.status = 405; });
		}
	}
}

router.post('/signup', signup);
router.post('/signin', signin);
router.post('/signup-pending', signupPending);

router.use(discord.routes());
router.use(github.routes());
router.use(twitter.routes());

router.get('/v1/instance/peers', async ctx => {
	const instances = await Instances.find({
		select: ['host'],
	});

	ctx.body = instances.map(instance => instance.host);
});

router.post('/miauth/:session/check', async ctx => {
	const token = await AccessTokens.findOneBy({
		session: ctx.params.session,
	});

	if (token && token.session != null && !token.fetched) {
		AccessTokens.update(token.id, {
			fetched: true,
		});

		ctx.body = {
			ok: true,
			token: token.token,
			user: await Users.pack(token.userId, null, { detail: true }),
		};
	} else {
		ctx.body = {
			ok: false,
		};
	}
});

// Return 404 for unknown API
router.all('(.*)', async ctx => {
	ctx.status = 404;
});

// Register router
app.use(router.routes());

export default app;