import Fastify, { type FastifyReply, type FastifyRequest } from "fastify";
import FastifyFormBody from "@fastify/formbody";
import FastifyMultipart from "@fastify/multipart";
import FastifyCookie from "@fastify/cookie";
import FastifyView from "@fastify/view";
import FastifyStatic from "@fastify/static";
import Config from "./objects/Config";
import EJS from "ejs";
import { Console } from "hsconsole";
import Controller from "./controllers/Controller";
import HomeController from "./controllers/HomeController";
import Database from "./objects/Database";
import { join } from "path";
import AccountController from "./controllers/AccountController";
import { magenta, blue, cyan, green, red } from "dyetty";
import ConsoleUtility from "./utilities/ConsoleUtility";
import HashFS from "./objects/HashFS";
import FunkyArray from "funky-array";
import MediaService from "./services/MediaService";
import Media from "./entities/Media";
import HeaderUtility from "./utilities/HeaderUtility";
import { createReadStream } from "fs";

Console.customHeader(`EUS server started at ${new Date()}`);

const fastify = Fastify({
	logger: false
});

fastify.register(FastifyView, {
	engine: {
		ejs: EJS
	}
});

fastify.register(FastifyFormBody);

fastify.register(FastifyMultipart, {
	limits: {
		files: 1,
		fileSize: 104857600
	}
});

fastify.register(FastifyCookie, {
	secret: Config.session.secret,
	parseOptions: {
		path: "/",
		secure: true
	}
});

fastify.register(FastifyStatic, {
	root: join(__dirname, "wwwroot"),
	preCompressed: true,
	decorateReply: false,
	redirect: false
});

function printReqInfo(req: FastifyRequest, res: FastifyReply) {
	// @ts-ignore
	Console.printInfo(`[ ${req.logType} ] [ ${req.method.toUpperCase()} ] [ ${ConsoleUtility.StatusColor(res.statusCode)} ] [ ${blue(`${Date.now() - req.startTime}ms`)} ] > ${req.url}`);
}

const hashLookupCache = new FunkyArray<string, Media>();
fastify.addHook("preHandler", (req, res, done) => {
	(async () => {
		// @ts-ignore
		req.startTime = Date.now();

		// * Take usual controller path if this path is registered.
		if (Controller.RegisteredPaths.includes(req.url)) {
			// @ts-ignore
			req.logType = cyan("CONTROLLER");
			HeaderUtility.AddBakedHeaders(res);
			return done();
		} else {
			const urlParts = req.url.split("/");
			if (urlParts.length === 2 && urlParts[1].length <= 16) {
				let media = hashLookupCache.get(urlParts[1]) ?? null;
				if (!media) {
					media = await MediaService.GetByTag(urlParts[1]);
					if (media) {
						hashLookupCache.set(urlParts[1], media);
					}
				}

				if (media) {
					// @ts-ignore
					req.logType = cyan("MEDIA");
					const fileStore = HashFS.GetHashFSInstance("images");
					const readStream = createReadStream(join(fileStore.path, fileStore.GetRelativePath(media.Hash)));
					res.raw.writeHead(200, HeaderUtility.CombineHeaders({
						"content-type": media.MediaType,
						"content-length": media.FileSize,
					}));
					readStream.pipe(res.raw);

					printReqInfo(req, res);
					return;
				}
			} else {
				HeaderUtility.AddBakedHeaders(res);
			}

			// @ts-ignore
			req.logType = magenta("STATIC");
		}

		return done();
	})();
});

fastify.addHook("onSend", (req, res, _payload, done) => {
	printReqInfo(req, res);

	done();
});

fastify.setNotFoundHandler(async (_req, res) => {

	return res.status(404).view("views/404.ejs");
});

HashFS.STARTUP_DIR = __dirname;
new HashFS("images");

if (Config.database.enabled) {
	new Database(Config.database.address, Config.database.port, Config.database.username, Config.database.password, Config.database.name);
} else {
	Console.printInfo(`[ ${red("DATABASE")} ] Database is disabled.`);
}

if (Config.controllers.enabled && Config.database.enabled) {
	Controller.FastifyInstance = fastify;
	new AccountController();
	new HomeController();
} else {
	Console.printInfo(`[ ${red("CONTROLLER")} ] Controllers are disabled${Config.controllers.enabled && !Config.database.enabled ? " because the database is disabled but required by the controllers." : "."} Server will operate in static mode only.`);
}

fastify.listen({ port: Config.hosts.webPort, host: Config.hosts.webHost }, (err, address) => {
	if (err) {
		Console.printError(`Error occured while spinning up fastify:\n${err}`);
		process.exit(1);
	}

	Console.printInfo(`[ ${green("MAIN")} ] Listening at ${address.replace("0.0.0.0", "localhost").replace("127.0.0.1", "localhost")}`);
});