// *************************************************************************
// * (C)opyright 2026         by Ruben Carlo Benante                       *
// *                                                                       *
// * This program is free software; you can redistribute it and/or modify  *
// *  it under the terms of the GNU General Public License as published by *
// *  the Free Software Foundation, either version 3 of the License, or    *
// *  (at your option) any later version.                                  *
// *                                                                       *
// * This program is distributed in the hope that it will be useful,       *
// *  but WITHOUT ANY WARRANTY; without even the implied warranty of       *
// *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the        *
// *  GNU General Public License for more details.                         *
// *                                                                       *
// * You should have received a copy of the GNU General Public License     *
// *  along with this program.  If not, see http://www.gnu.org/licenses/.  *
// *                                                                       *
// * Contact author at:                                                    *
// *  Ruben Carlo Benante                                                  *
// *  rcb@beco.cc                                                          *
// *************************************************************************

import esbuild from 'esbuild';
import process from 'process';
import { cp, mkdir, readFile, readdir, writeFile } from 'node:fs/promises';

const banner = `/*
 * logsdu - fills and submits a three-field academic portal login.
 * Copyright (C) 2026 Ruben Carlo Benante (Dr. Beco) <rcb@beco.cc>
 * Licensed under the GNU General Public License v3.0 or later.
 * See https://www.gnu.org/licenses/ and the LICENSE file.
 *
 * THIS IS A GENERATED/BUNDLED FILE BY ESBUILD.
 * To view the source, visit the repository of this extension.
 */
`;

const prod = process.argv[2] === 'production';

// Target browser. Firefox and Chrome disagree on exactly one manifest key, so
// the manifest is written per target rather than duplicated in the tree.
const target = process.env.TARGET === 'chrome' ? 'chrome' : 'firefox';

// Each target gets its own directory. They used to share one, and the result
// was that whichever build ran last silently won: loading the other browser's
// output then failed with a confusing manifest error. Separate directories
// mean both can exist at once and neither can be stale by accident.
const outdir = `build/${target}`;

/**
 * Write the manifest for the target browser.
 *
 * Firefox MV3 runs the background as an event page ("scripts"); Chrome MV3
 * requires a service worker and rejects "scripts" outright, so the two cannot
 * simply coexist in one file. Chrome also has no use for the gecko block.
 */
async function writeManifest() {
	const manifest = JSON.parse(await readFile('src/manifest.json', 'utf8'));
	if (target === 'chrome') {
		delete manifest.browser_specific_settings;
		manifest.background = { service_worker: 'background.js' };
	}
	await writeFile(
		`${outdir}/manifest.json`,
		`${JSON.stringify(manifest, null, '\t')}\n`,
	);
}

// Everything that is not TypeScript is copied verbatim into the output, so
// that the directory can be handed straight to about:debugging or to Chrome's
// "Load unpacked".
async function copyStatic() {
	await mkdir(outdir, { recursive: true });
	for (const name of await readdir('src')) {
		if (name.endsWith('.html') || name.endsWith('.css')) {
			await cp(`src/${name}`, `${outdir}/${name}`);
		}
	}
	await cp('icons', `${outdir}/icons`, { recursive: true });
	await writeManifest();
}

await copyStatic();

// In watch mode the static files must follow every rebuild, otherwise editing
// manifest.json or a .html file silently changes nothing in the output.
const staticPlugin = {
	name: 'copy-static',
	setup(build) {
		build.onEnd(() => copyStatic());
	},
};

const context = await esbuild.context({
	banner: {
		js: banner,
	},
	plugins: [staticPlugin],
	// Five independent entry points: no shared runtime, no imports at load
	// time. Content scripts and page-world scripts cannot be ES modules, so
	// every bundle has to stand alone.
	entryPoints: [
		'src/background.ts',
		'src/content.ts',
		'src/injected.ts',
		'src/options.ts',
		'src/popup.ts',
	],
	bundle: true,
	format: 'iife',
	target: 'es2021',
	logLevel: 'info',
	sourcemap: prod ? false : 'inline',
	treeShaking: true,
	outdir,
	// Deliberately never minified. addons.mozilla.org requires a separate
	// source-code submission for any add-on whose uploaded code is minified or
	// otherwise machine-generated, and that obligation would apply to every
	// release from now on. The whole extension is a few tens of kilobytes, so
	// the saving would not pay for the process, and shipping readable code
	// makes the review -- and anyone auditing what handles their credentials --
	// straightforward.
	minify: false,
});

if (prod) {
	await context.rebuild();
	process.exit(0);
} else {
	await context.watch();
}