#!/usr/bin/env node

/**
 * This script parses index.html and sets the version query string of each
 * resource to be the MD5 hash of that resource.
 * It also updates news and the learnsets-g6.js file.
 */

"use strict";

const path = require('path');
const fs = require('fs');
const crypto = require('crypto');
const child_process = require('child_process');
const compiler = require('./compiler');

const thisDir = __dirname;
const rootDir = path.resolve(thisDir, '..');
process.chdir(rootDir);

const AUTOCONFIG_START = '/*** Begin automatically generated configuration ***/';
const AUTOCONFIG_END = '/*** End automatically generated configuration ***/';

function escapeRegex(string) {
	return string.replace(/[\/\*\.]/g, '\\$&');
}

/*********************************************************
 * Update version number
 *********************************************************/

process.stdout.write("Updating version... ");

let version = require('../package.json').version;
try {
	let commit = child_process.execSync('git rev-parse HEAD', {
		stdio: ['ignore', 'pipe', 'ignore'],
	});
	const head = ('' + commit).trim();
	commit = child_process.execSync('git merge-base origin/master HEAD', {
		stdio: ['ignore', 'pipe', 'ignore'],
	});
	const origin = ('' + commit).trim();
	version += ` (${head.slice(0, 8)}${head !== origin ? `/${origin.slice(0, 8)}` : ''})`;
} catch (e) {}

const routes = JSON.parse(fs.readFileSync('config/routes.json'));
const autoconfigRegex = new RegExp(`${escapeRegex(AUTOCONFIG_START)}[^]+${escapeRegex(AUTOCONFIG_END)}`);
const autoconfig = `${AUTOCONFIG_START}
Config.version = ${JSON.stringify(version)};

Config.routes = {
	root: '${routes.root}',
	client: '${routes.client}',
	dex: '${routes.dex}',
	replays: '${routes.replays}',
	users: '${routes.users}',
};
${AUTOCONFIG_END}`;

// remove old automatically generated configuration and add the new one
let configBuf = fs.readFileSync('config/config.js', {encoding: 'utf8'});
if (autoconfigRegex.test(configBuf)) {
	configBuf = configBuf.replace(autoconfigRegex, autoconfig);
} else {
	configBuf += autoconfig;
}
fs.writeFileSync('config/config.js', configBuf);
console.log("DONE");

/*********************************************************
 * Compile TS files
 *********************************************************/

process.stdout.write("Compiling TS files... ");

let compileStartTime = process.hrtime();
let compiledFiles = 0;

let compileOpts = {
	incremental: true,
	ignore: ['src/battle-animations.js', 'src/battle-animations-moves.js'],
};
if (process.argv[2] === 'full') {
	delete compileOpts.ignore;
} else {
	try {
		fs.statSync('data/graphics.js');
		// graphics.js exists, recompile it
		delete compileOpts.ignore;
	} catch (e) {}
}

compiledFiles += compiler.compileToDir(`src`, `js`, compileOpts);

compiledFiles += compiler.compileToDir(`src`, `js`, compileOpts);

compiledFiles += compiler.compileToFile(
	['src/battle-dex.ts', 'src/battle-dex-data.ts', 'src/battle-log.ts', 'src/battle-log-misc.js', 'data/text.js', 'src/battle-text-parser.ts'],
	'js/battledata.js',
	compileOpts
);

if (!compileOpts.ignore) {
	compiledFiles += compiler.compileToFile(
		['src/battle-animations.ts', 'src/battle-animations-moves.ts'],
		'data/graphics.js',
		compileOpts
	);
}

const diff = process.hrtime(compileStartTime);
console.log(
	`(${compiledFiles} ${compiledFiles !== 1 ? "files" : "file"} in ${diff[0] + Math.round(diff[1] / 1e6) / 1e3}s) DONE`
);

/*********************************************************
 * Update cachebuster and News
 *********************************************************/

process.stdout.write("Updating cachebuster and URLs... ");

const URL_REGEX = /(src|href)="\/(.*?)(\?[a-z0-9]*?)?"/g;

function updateURL(a, b, c, d) {
	c = c.replace('/replay.pokemonshowdown.com/', '/' + routes.replays + '/');
	c = c.replace('/dex.pokemonshowdown.com/', '/' + routes.dex + '/');
	c = c.replace('/play.pokemonshowdown.com/', '/' + routes.client + '/');
	c = c.replace('/pokemonshowdown.com/', '/' + routes.root + '/');

	if (d) {
		let hash = Math.random(); // just in case creating the hash fails
		try {
			const filename = c.replace('/' + routes.client + '/', '');
			const fstr = fs.readFileSync(filename, {encoding: 'utf8'});
			hash = crypto.createHash('md5').update(fstr).digest('hex').substr(0, 8);
		} catch (e) {}

		return b + '="/' + c + '?' + hash + '"';
	} else {
		return b + '="/' + c + '"';
	}
}

function writeFiles(indexContents, preactIndexContents, crossprotocolContents, replayEmbedContents) {
	fs.writeFileSync('index.html', indexContents);
	fs.writeFileSync('preactalpha.html', preactIndexContents);
	fs.writeFileSync('crossprotocol.html', crossprotocolContents);
	fs.writeFileSync('js/replay-embed.js', replayEmbedContents);
	console.log("DONE");
}

function updateFiles() {
	// add hashes to js and css files and rewrite URLs
	let indexContents = fs.readFileSync('index.template.html', {encoding: 'utf8'});
	indexContents = indexContents.replace(URL_REGEX, updateURL);
	let preactIndexContents = fs.readFileSync('preactalpha.template.html', {encoding: 'utf8'});
	preactIndexContents = preactIndexContents.replace(URL_REGEX, updateURL);
	let crossprotocolContents = fs.readFileSync('crossprotocol.template.html', {encoding: 'utf8'});
	crossprotocolContents = crossprotocolContents.replace(URL_REGEX, updateURL);
	let replayEmbedContents = fs.readFileSync('js/replay-embed.template.js', {encoding: 'utf8'});
	replayEmbedContents = replayEmbedContents.replace(/play\.pokemonshowdown\.com/g, routes.client);

	// add news, only if it's actually likely to exist
	if (__dirname.endsWith('play.pokemonshowdown.com/build-tools')) {
		process.stdout.write("and news... ");
		child_process.exec('php ' + path.resolve(thisDir, 'news-data.php'), function (error, stdout, stderr) {
			let newsData = [0, '[failed to retrieve news]'];
			if (!error && !stderr) {
				try {
					newsData = JSON.parse(stdout);
				} catch (e) {
					console.log("git hook failed to retrieve news (parsing JSON failed):\n" + e.stack);
				}
			} else {
				console.log("git hook failed to retrieve news (exec command failed):\n" + (error + stderr + stdout));
			}

			indexContents = indexContents.replace(/<!-- newsid -->/g, newsData[0]);
			indexContents = indexContents.replace(/<!-- news -->/g, newsData[1]);

			writeFiles(indexContents, preactIndexContents, crossprotocolContents, replayEmbedContents);
		});
	} else {
		writeFiles(indexContents, preactIndexContents, crossprotocolContents, replayEmbedContents);
	}
}

updateFiles();