// Import all the things
require('dotenv').config();
const axios = require('axios');
const express = require('express');
const fs = require('node:fs');
const path = require('node:path');
const readline = require('node:readline/promises');
const http = require('node:http');

// yes, it is `new new require('ytmusic-api')`, i didnt fuck up
// this is literally black magic i have no idea how or why it works
const ytmusic = new new require('ytmusic-api'); // i love me a new new

// Create interface for console
const rl = readline.createInterface({input:process.stdin, output:process.stdout});

// Global constants

/**
 * Should always be `/prod/portfolio`, dynamically caching it in case i decide to move it to a different path sometime in the future
 */
const baseDir = process.cwd();

/**
 * The ID for my favorite moosic playlist :D
 */
const playlistId = 'PLnlTMS4cxfx3-et_L8APzpEgy_eCf18-U';

/**
 * Port that nginx proxies to public
 */
const port = process.env.PORT || 48916;

/**
 * Are we prod or dev
 */
const dev = process.env.DEV || true;

// Helper functions I've made to do things and stuff :P

/**
 * Loops a thing every hour
 * @param {Function} something 
 * @param {Boolean} skipFirst 
 * @returns jack shit
*/
// I know, I know, I am just the most bestest and awesomest coder everrrrr
const loopHourly = (something, skipFirst = false) => {
	// If skipFirst is false, we do the thing immediately
	if (!skipFirst) setTimeout(() => {
		let cancel = false;
		something();
		if (!cancel) loopHourly(something);
		return;
	}, 3600000 - new Date().getTime() % 3600000); // 3600000 ms = 1000 ms (one second) * 60 seconds (one minute) * 60 minutes (one hour)

	// If skipFirst is true, wait a hour then execute
	else setTimeout(() => { 
		loopHourly(something)
	}, 3600000 - new Date().getTime() % 3600000);
}

/**
 * Pulls all the pictures for the songs and stores them in a base64 key:value array where the key is the song id and the value is the thumbnail
 * @param {*} song 
 */
const populateThumbnails = (async song => {
	let id = song.videoId;
	let thumbnail;

	const response = await axios.get(song.thumbnails[song.thumbnails.length - 1].url, { responseType: 'arraybuffer' });

	// We now check if Youtube moosic has yelled back a thing we want to hear
	if (response.status == 200) {
		thumbnail = Buffer.from(response.data, "utf-8").toString('base64');
		thumbnails.push({ id, thumbnail });
	} else {
		console.error("Failed to pull thumbnail: " + response);
	}
});

// Updates the list of songs by yelling at youtube moosic to gimme the playlist
async function updateSongs() {

	// Yell at youtube moosic to get a list of songs
	playlistSongs = await ytmusic.getPlaylistVideos(playlistId);

	if (typeof playlistSongs == 'object') {
		// For each song that youtube moosic has yelled back at us, give them individually to populateThumbnails()
		await Promise.all(playlistSongs.map(async song => await populateThumbnails(song)));
	}
	else {
		// like legit this shouldnt even be possible
		console.log("somehow i have managed to get this code into an area i thought impossible");
		console.log("*various anxiousness noises*");
		console.log("help");
		throw TypeError('playlistSongs is not a object!'); // this should never ever happen, if it does that is very very bad
	}
}

var blog; // Setup the blog variable

// Blog stuffs

async function generateBlogIndex() {
	var blogfolder = fs.readdirSync(path.join(baseDir, 'blog/'));
	var tmpobj = {};
	blogfolder.forEach(thing => {
		if (fs.statSync(path.join(baseDir, `blog/${thing}`)).isDirectory()) {
			var files = fs.readdirSync(path.join(baseDir, `blog/${thing}`));
			tmpobj[thing] = {};
			files.forEach(file => {
				tmpobj[thing][file] = true;
			});
		}
	});
	blog = tmpobj;
}

async function send404(req, res) {
	// TODO: actual 404 page
	res.status(404).send("<h1><pre>404 Not found</pre></h1>");
}

// Begin the server-ing things
const app = express();
var server; // Set at app.listen (bottom), used to kill server on ctrl-c

// YT Music stuff
/**
 * An object that stores a Map of songs (also objects)
 */
let playlistSongs = new Map;
/**
 * Key:Value array of songs. The song ID is the key, and a base64 encoded image is the value
 */
let thumbnails = [];

// Other middlewares
app.set('view engine', 'ejs');
app.use(express.static('public'));
app.use(express.static('private'));
app.use(express.urlencoded({ extended: true }));
app.use((req, res, next) => {
	res.setHeader("Content-Security-Policy","default-src 'self' 'unsafe-inline'; script-src-elem 'self' 'unsafe-inline'; img-src 'self' data:; frame-src 'self';");
	next();
});

// Cache the favicon cause I'm probably not gonna change that for a while
const favicon = fs.readFileSync('public/favicon.ico');
// Also cache a base64 version of it to pass to my pages
const faviconb64 = favicon.toString('base64');

// ---------------------
// - Routes begin here -
// ---------------------

// Sends the cached favicon.ico to prevent an unneeded read on a static file :P
app.get('/favicon.ico', (req, res) => {
	res.status(200).send(favicon);
});

// Home page
app.get('/', (req, res) => {
	res.render('home', { faviconb64 });
});

// Fun Fact page
app.get('/funfact', (req, res) => {
	res.render('funfact', { });
});

// The page with all my art :>
app.get('/art', (req, res) => {
	res.render('art', { faviconb64 });
});

// Moosic page
app.get('/music', (req, res) => {
	res.render('moosic', { faviconb64, playlistId, playlistSongs, thumbnails });
});

// Blog
app.get('/blog', (req, res) => {
	if (req.query && req.query.sample == "1") {
		res.render('blog', { faviconb64, type: "sample", page: null, blog });
	} 
	else res.render('blog', { faviconb64, type: "main", page: null, blog });
});

// Individual blog pages / topic pages
app.get(/^\/blog\/.*/, (req, res) => {
	let requestedTopic = req.path.split('/blog/')[1].split('/')[0];
	let requestedPage = req.path.split('/blog/')[1].split('/')[1];
	let topic = blog[requestedTopic];
	let page;
	if (typeof topic != "object") {
		send404(req, res);
		return;
	}
	if (topic[requestedPage] == true) {
		page = fs.readFileSync(path.join(baseDir, 'blog', requestedTopic, requestedPage));
		res.render('blog', { faviconb64, type: "individual", page, blog })
	} else send404(req, res);
});

app.get('/editor', (req, res) => {
	res.render('editor', { faviconb64 })
});

// Error handling (must be 2nd to last last app.use to make sure it catches all the errorings)
app.use(function(err, req, res, next) {
	if(!err) {
		next();
		return;
	}
	console.error('-------------------------------ERROR---------------------------------------\n');
	console.error(err); // Log da errors
	console.error('-----------------------------USER-INFO-------------------------------------\n');
	console.error("Body:\n");
	console.error(req.body);
	console.error("\n");
	console.error("Cookies:\n");
	console.error(req.cookies);
	console.error("\n");
	console.error("Host:\n");
	console.error(req.host);
	console.error("\n");
	console.error("Path:\n");
	console.error(req.path);
	console.error("\n");
	console.error('----------------------------------------------------------------------------\n');
	res.status(400).send("<pre>An internal server error has occurred. Please bother me if you see this.<br />Contact me at @oddbyte.11 on Signal, or <a href='mailto:contact@oddbyte.dev'>contact@oddbyte.dev</a> if you are a caveman and are stuck in the last decade.</pre>"); // Give the user something that they can read
});

// 404
app.use(function(req, res) {
	send404(req, res);
});

function printHelp() {
	rl.write("\n\n-------------------------------HELP-----------------------------------------\n");
	rl.write("> help [?] - prints this message\n");
	rl.write("> updateMusic [um] - runs updateSongs()\n");
	rl.write("> eval [exec] - runs raw JS code, returns output (if any)\n");
	rl.write("> quit [exit] - stops the server, and quits\n");
	rl.write("-------------------------------HELP-----------------------------------------\n\n")
}

function quit() {
	server.close();
	rl.write('\n\nI do declare - end broadcast\n\n'); // Yoinked Lunduke Journal's signoff :>
	rl.close();
	process.exit(0);
}

async function customConsole() {
	while (1) {
		// Pull commands
		const cmd_raw = await rl.question("> ");
		const cmd_raw_args = cmd_raw.split(" ");
		const cmd_args = cmd_raw_args.slice(1);
		const cmd = cmd_raw_args[0];

		switch(cmd) {
			case "?":
			case "help":
				printHelp();
				break;
			case "um":
			case "updateMusic":
				updateSongs();
				break;
			case "exec":
			case "eval":
				// TODO: Fix this not actually using the correct context for whatever reason it just evals in an empty context
				// ...... i dont know what or how or why but magically it is working now so i am just not gonna touch it and hope
				// whatever black magic made it work keeps working .-.
				try {
					rl.write(eval(cmd_args.toString()) + "\n");
				} catch (err) {
					console.error(err);
				}
				break;
			case "quit":
			case "exit":
				quit();
				return;
			case "":
				break;
			default:
				rl.write(`Command not found: ${cmd}`)
				printHelp();
				break;
		}
	}
}

// Wrap in a async function to wait for youtube music response before starting http server
// (to prevent a race condition where people can view the moosic page be4 it is ready)
async function main() {

	// Init the moosics stuff (black magic)
	await ytmusic.initialize();

	// Populate playlistSongs and thumbnails
	await updateSongs();
	
	// Populate the blog index
	await generateBlogIndex();

	server = http.createServer(app);

	await (async () => {
		server.listen(port, () => {
			console.log(`Listening to ${port}`);

			// Start hourly loop to update playlist
			loopHourly(async () => await updateSongs());
		});
	})();
	
	// Start console
	customConsole();
}

// Handle a few signals

rl.on('SIGINT', () => {
	quit();
});

rl.on('SIGTERM', () => {
	quit();
}); 

main();