/**
 * Web Client Server
 */

import { dirname } from 'node:path';
import { fileURLToPath } from 'node:url';
import { PathOrFileDescriptor, readFileSync } from 'node:fs';
import ms from 'ms';
import Koa from 'koa';
import Router from '@koa/router';
import send from 'koa-send';
import favicon from 'koa-favicon';
import views from 'koa-views';
import sharp from 'sharp';
import { createBullBoard } from '@bull-board/api';
import { BullAdapter } from '@bull-board/api/bullAdapter.js';
import { KoaAdapter } from '@bull-board/koa';

import { In, IsNull } from 'typeorm';
import { fetchMeta } from '@/misc/fetch-meta.js';
import config from '@/config/index.js';
import { Users, Notes, UserProfiles, Pages, Channels, Clips, GalleryPosts } from '@/models/index.js';
import * as Acct from '@/misc/acct.js';
import { getNoteSummary } from '@/misc/get-note-summary.js';
import { queues } from '@/queue/queues.js';
import { genOpenapiSpec } from '../api/openapi/gen-spec.js';
import { urlPreviewHandler } from './url-preview.js';
import { manifestHandler } from './manifest.js';
import packFeed from './feed.js';

const _filename = fileURLToPath(import.meta.url);
const _dirname = dirname(_filename);

const staticAssets = `${_dirname}/../../../assets/`;
const clientAssets = `${_dirname}/../../../../client/assets/`;
const assets = `${_dirname}/../../../../../built/_client_dist_/`;
const swAssets = `${_dirname}/../../../../../built/_sw_dist_/`;

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

//#region Bull Dashboard
const bullBoardPath = '/queue';

// Authenticate
app.use(async (ctx, next) => {
	if (ctx.path === bullBoardPath || ctx.path.startsWith(bullBoardPath + '/')) {
		const token = ctx.cookies.get('token');
		if (token == null) {
			ctx.status = 401;
			return;
		}
		const user = await Users.findOneBy({ token });
		if (user == null || !(user.isAdmin || user.isModerator)) {
			ctx.status = 403;
			return;
		}
	}
	await next();
});

const serverAdapter = new KoaAdapter();

createBullBoard({
	queues: queues.map(q => new BullAdapter(q)),
	serverAdapter,
});

serverAdapter.setBasePath(bullBoardPath);
app.use(serverAdapter.registerPlugin());
//#endregion

// Init renderer
app.use(views(_dirname + '/views', {
	extension: 'pug',
	options: {
		version: config.version,
		getClientEntry: () => process.env.NODE_ENV === 'production' ?
			config.clientEntry :
			JSON.parse(readFileSync(`${_dirname}/../../../../../built/_client_dist_/manifest.json`, 'utf-8'))['src/init.ts'],
		config,
	},
}));

// Serve favicon
app.use(favicon(`${_dirname}/../../../assets/favicon.ico`));

// Common request handler
app.use(async (ctx, next) => {
	// IFrameの中に入れられないようにする
	ctx.set('X-Frame-Options', 'DENY');
	await next();
});

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

//#region static assets

router.get('/static-assets/(.*)', async ctx => {
	await send(ctx as any, ctx.path.replace('/static-assets/', ''), {
		root: staticAssets,
		maxage: ms('7 days'),
	});
});

router.get('/client-assets/(.*)', async ctx => {
	await send(ctx as any, ctx.path.replace('/client-assets/', ''), {
		root: clientAssets,
		maxage: ms('7 days'),
	});
});

router.get('/assets/(.*)', async ctx => {
	await send(ctx as any, ctx.path.replace('/assets/', ''), {
		root: assets,
		maxage: ms('7 days'),
	});
});

// Apple touch icon
router.get('/apple-touch-icon.png', async ctx => {
	await send(ctx as any, '/apple-touch-icon.png', {
		root: staticAssets,
	});
});

router.get('/twemoji/(.*)', async ctx => {
	const path = ctx.path.replace('/twemoji/', '');

	if (!path.match(/^[0-9a-f-]+\.svg$/)) {
		ctx.status = 404;
		return;
	}

	ctx.set('Content-Security-Policy', 'default-src \'none\'; style-src \'unsafe-inline\'');

	await send(ctx as any, path, {
		root: `${_dirname}/../../../node_modules/@discordapp/twemoji/dist/svg/`,
		maxage: ms('30 days'),
	});
});

router.get('/twemoji-badge/(.*)', async ctx => {
	const path = ctx.path.replace('/twemoji-badge/', '');

	if (!path.match(/^[0-9a-f-]+\.png$/)) {
		ctx.status = 404;
		return;
	}

	const mask = await sharp(
		`${_dirname}/../../../node_modules/@discordapp/twemoji/dist/svg/${path.replace('.png', '')}.svg`,
		{ density: 1000 },
	)
		.resize(488, 488)
		.greyscale()
		.normalise()
		.linear(1.75, -(128 * 1.75) + 128) // 1.75x contrast
		.flatten({ background: '#000' })
		.extend({
			top: 12,
			bottom: 12,
			left: 12,
			right: 12,
			background: '#000',
		})
		.toColorspace('b-w')
		.png()
		.toBuffer();

	const buffer = await sharp({
		create: { width: 512, height: 512, channels: 4, background: { r: 0, g: 0, b: 0, alpha: 0 } },
	})
		.pipelineColorspace('b-w')
		.boolean(mask, 'eor')
		.resize(96, 96)
		.png()
		.toBuffer();

	ctx.set('Content-Security-Policy', 'default-src \'none\'; style-src \'unsafe-inline\'');
	ctx.set('Cache-Control', 'max-age=2592000');
	ctx.set('Content-Type', 'image/png');
	ctx.body = buffer;
});

// ServiceWorker
router.get(`/sw.js`, async ctx => {
	await send(ctx as any, `/sw.js`, {
		root: swAssets,
		maxage: ms('10 minutes'),
	});
});

// Manifest
router.get('/manifest.json', manifestHandler);

router.get('/robots.txt', async ctx => {
	await send(ctx as any, '/robots.txt', {
		root: staticAssets,
	});
});

//#endregion

// Docs
router.get('/api-doc', async ctx => {
	await send(ctx as any, '/redoc.html', {
		root: staticAssets,
	});
});

// URL preview endpoint
router.get('/url', urlPreviewHandler);

router.get('/api.json', async ctx => {
	ctx.body = genOpenapiSpec();
});

const getFeed = async (acct: string) => {
	const meta = await fetchMeta();
	if (meta.privateMode) {
		return;
	}
	const { username, host } = Acct.parse(acct);
	const user = await Users.findOneBy({
		usernameLower: username.toLowerCase(),
		host: host ?? IsNull(),
		isSuspended: false,
	});

	return user && await packFeed(user);
};

// Atom
router.get('/@:user.atom', async ctx => {
	const feed = await getFeed(ctx.params.user);

	if (feed) {
		ctx.set('Content-Type', 'application/atom+xml; charset=utf-8');
		ctx.body = feed.atom1();
	} else {
		ctx.status = 404;
	}
});

// RSS
router.get('/@:user.rss', async ctx => {
	const feed = await getFeed(ctx.params.user);

	if (feed) {
		ctx.set('Content-Type', 'application/rss+xml; charset=utf-8');
		ctx.body = feed.rss2();
	} else {
		ctx.status = 404;
	}
});

// JSON
router.get('/@:user.json', async ctx => {
	const feed = await getFeed(ctx.params.user);

	if (feed) {
		ctx.set('Content-Type', 'application/json; charset=utf-8');
		ctx.body = feed.json1();
	} else {
		ctx.status = 404;
	}
});

// MOTD
const motd = [
	'If you\'re on mobile, you can tap install/add to homescreen to get the app!',
	'You can click the time a note was posted to get a full view of the note.',
	'Wanna find people to follow? Head over to the Explore tab!',
	'Want more ways to post? You can make blogs in Pages and galleries in Gallery tab.',
	'You can add cool stuff to notes like CWs, polls, multiple videos/gifs, and audio!',
	'Use #hashtags to tag notes and reach more people, especially for #art.',
	'If your note gets popular, it might show up on the Featured tap for up to 3 days!',
	'Use the 4 buttons at the top (or the top drop-down on mobile) to switch timelines.',
	'The Fediverse is made up of more than just Calckey.',
	'Avatars and banners can be GIFs.',
  'When writing a note, type $ to see a list of cool text effects (mfm).',
	'Be gay, do crime.',
];

//#region SSR (for crawlers)
// User
router.get(['/@:user', '/@:user/:sub'], async (ctx, next) => {
	const { username, host } = Acct.parse(ctx.params.user);
	const user = await Users.findOneBy({
		usernameLower: username.toLowerCase(),
		host: host ?? IsNull(),
		isSuspended: false,
	});

	if (user != null) {
		const profile = await UserProfiles.findOneByOrFail({ userId: user.id });
		const meta = await fetchMeta();
		const me = profile.fields
			? profile.fields
				.filter(filed => filed.value != null && filed.value.match(/^https?:/))
				.map(field => field.value)
			: [];

		await ctx.render('user', {
			user, profile, me,
			avatarUrl: await Users.getAvatarUrl(user),
			sub: ctx.params.sub,
			instanceName: meta.name || 'Calckey',
			icon: meta.iconUrl,
			themeColor: meta.themeColor,
			privateMode: meta.privateMode,
			randomMOTD: motd[Math.floor(Math.random() * motd.length)],
		});
		ctx.set('Cache-Control', 'public, max-age=3');
	} else {
		// リモートユーザーなので
		// モデレータがAPI経由で参照可能にするために404にはしない
		await next();
	}
});

router.get('/users/:user', async ctx => {
	const user = await Users.findOneBy({
		id: ctx.params.user,
		host: IsNull(),
		isSuspended: false,
	});

	if (user == null) {
		ctx.status = 404;
		return;
	}

	ctx.redirect(`/@${user.username}${ user.host == null ? '' : '@' + user.host}`);
});

// Note
router.get('/notes/:note', async (ctx, next) => {
	const note = await Notes.findOneBy({
		id: ctx.params.note,
		visibility: In(['public', 'home']),
	});

	if (note) {
		const _note = await Notes.pack(note);
		const profile = await UserProfiles.findOneByOrFail({ userId: note.userId });
		const meta = await fetchMeta();
		await ctx.render('note', {
			note: _note,
			profile,
			avatarUrl: await Users.getAvatarUrl(await Users.findOneByOrFail({ id: note.userId })),
			// TODO: Let locale changeable by instance setting
			summary: getNoteSummary(_note),
			instanceName: meta.name || 'Calckey',
			icon: meta.iconUrl,
			privateMode: meta.privateMode,
			themeColor: meta.themeColor,
		});

		ctx.set('Cache-Control', 'public, max-age=15');

		return;
	}

	await next();
});

// Page
router.get('/@:user/pages/:page', async (ctx, next) => {
	const { username, host } = Acct.parse(ctx.params.user);
	const user = await Users.findOneBy({
		usernameLower: username.toLowerCase(),
		host: host ?? IsNull(),
	});

	if (user == null) return;

	const page = await Pages.findOneBy({
		name: ctx.params.page,
		userId: user.id,
	});

	if (page) {
		const _page = await Pages.pack(page);
		const profile = await UserProfiles.findOneByOrFail({ userId: page.userId });
		const meta = await fetchMeta();
		await ctx.render('page', {
			page: _page,
			profile,
			avatarUrl: await Users.getAvatarUrl(await Users.findOneByOrFail({ id: page.userId })),
			instanceName: meta.name || 'Calckey',
			icon: meta.iconUrl,
			themeColor: meta.themeColor,
			privateMode: meta.privateMode,
		});

		if (['public'].includes(page.visibility)) {
			ctx.set('Cache-Control', 'public, max-age=15');
		} else {
			ctx.set('Cache-Control', 'private, max-age=0, must-revalidate');
		}

		return;
	}

	await next();
});

// Clip
// TODO: 非publicなclipのハンドリング
router.get('/clips/:clip', async (ctx, next) => {
	const clip = await Clips.findOneBy({
		id: ctx.params.clip,
	});

	if (clip) {
		const _clip = await Clips.pack(clip);
		const profile = await UserProfiles.findOneByOrFail({ userId: clip.userId });
		const meta = await fetchMeta();
		await ctx.render('clip', {
			clip: _clip,
			profile,
			avatarUrl: await Users.getAvatarUrl(await Users.findOneByOrFail({ id: clip.userId })),
			instanceName: meta.name || 'Calckey',
			privateMode: meta.privateMode,
			icon: meta.iconUrl,
			themeColor: meta.themeColor,
		});

		ctx.set('Cache-Control', 'public, max-age=15');

		return;
	}

	await next();
});

// Gallery post
router.get('/gallery/:post', async (ctx, next) => {
	const post = await GalleryPosts.findOneBy({ id: ctx.params.post });

	if (post) {
		const _post = await GalleryPosts.pack(post);
		const profile = await UserProfiles.findOneByOrFail({ userId: post.userId });
		const meta = await fetchMeta();
		await ctx.render('gallery-post', {
			post: _post,
			profile,
			avatarUrl: await Users.getAvatarUrl(await Users.findOneByOrFail({ id: post.userId })),
			instanceName: meta.name || 'Calckey',
			icon: meta.iconUrl,
			themeColor: meta.themeColor,
			privateMode: meta.privateMode,
		});

		ctx.set('Cache-Control', 'public, max-age=15');

		return;
	}

	await next();
});

// Channel
router.get('/channels/:channel', async (ctx, next) => {
	const channel = await Channels.findOneBy({
		id: ctx.params.channel,
	});

	if (channel) {
		const _channel = await Channels.pack(channel);
		const meta = await fetchMeta();
		await ctx.render('channel', {
			channel: _channel,
			instanceName: meta.name || 'Calckey',
			icon: meta.iconUrl,
			themeColor: meta.themeColor,
			privateMode: meta.privateMode,
		});

		ctx.set('Cache-Control', 'public, max-age=15');

		return;
	}

	await next();
});
//#endregion

router.get('/_info_card_', async ctx => {
	const meta = await fetchMeta(true);
	if (meta.privateMode) {
		ctx.status = 403;
		return;
	}

	ctx.remove('X-Frame-Options');

	await ctx.render('info-card', {
		version: config.version,
		host: config.host,
		meta: meta,
		originalUsersCount: await Users.countBy({ host: IsNull() }),
		originalNotesCount: await Notes.countBy({ userHost: IsNull() }),
	});
});

router.get('/bios', async ctx => {
	await ctx.render('bios', {
		version: config.version,
	});
});

router.get('/cli', async ctx => {
	await ctx.render('cli', {
		version: config.version,
	});
});

const override = (source: string, target: string, depth = 0) =>
	[, ...target.split('/').filter(x => x), ...source.split('/').filter(x => x).splice(depth)].join('/');

router.get('/flush', async ctx => {
	await ctx.render('flush');
});

// streamingに非WebSocketリクエストが来た場合にbase htmlをキャシュ付きで返すと、Proxy等でそのパスがキャッシュされておかしくなる
router.get('/streaming', async ctx => {
	ctx.status = 503;
	ctx.set('Cache-Control', 'private, max-age=0');
});

// Render base html for all requests
router.get('(.*)', async ctx => {
	const meta = await fetchMeta();
	await ctx.render('base', {
		img: meta.bannerUrl,
		title: meta.name || 'Calckey',
		instanceName: meta.name || 'Calckey',
		desc: meta.description,
		icon: meta.iconUrl,
		themeColor: meta.themeColor,
		privateMode: meta.privateMode,
	});
	ctx.set('Cache-Control', 'public, max-age=15');
});

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

export default app;