#!/usr/bin/env node
import { execFileSync } from 'node:child_process';
import { existsSync, mkdirSync, readFileSync, writeFileSync } from 'node:fs';
import { dirname, join } from 'node:path';
import { fileURLToPath } from 'node:url';

const ROOT = dirname(dirname(fileURLToPath(import.meta.url)));
const CATEGORIES = ['client', 'common', 'server'];

/**
 * Prints usage information and exits with an error status.
 * @param {string} message the reason the script is aborting
 */
function fail(message) {
	console.error(`Erreur : ${message}`);
	console.error('Usage : pnpm create-package <client|common|server> <nom-du-package>');
	process.exitCode = 1;
	process.exit(1);
}

const [, , category, name] = process.argv;

if (!category || !CATEGORIES.includes(category)) {
	fail(`catégorie invalide (attendu : ${CATEGORIES.join(', ')})`);
}
if (!name || !/^[a-z][a-z0-9-]*[a-z0-9]$/.test(name)) {
	fail('nom de package invalide (attendu : kebab-case, ex. "my-widget")');
}

const packageDir = join(ROOT, 'packages', category, name);
if (existsSync(packageDir)) {
	fail(`packages/${category}/${name} existe déjà`);
}

const npmName = `@lightweight-sdk/${name}`;
const isClient = category === 'client';

mkdirSync(join(packageDir, 'src'), { recursive: true });

const packageJson = {
	name: npmName,
	version: '0.0.1',
	description: `TODO: décrire le package ${name}.`,
	main: 'dist/index.js',
	types: 'dist/index.d.ts',
	files: ['dist'],
	engines: { node: '>=22' },
	publishConfig: {
		access: 'restricted',
		registry: 'https://git.dev.kyuno.fr/api/packages/kyuno/npm/',
	},
	typedocOptions: {
		entryPoints: ['src/index.ts'],
		readme: 'README.md',
	},
	// Déclarées explicitement (même si déjà présentes à la racine, où elles
	// seraient hoistées) : un package workspace sans aucune dépendance propre
	// peut se retrouver sans entrée dans pnpm-lock.yaml, ce qui casse
	// `pnpm install --frozen-lockfile` en CI (voir spec/ci-cd.md).
	devDependencies: {
		'@types/node': 'catalog:',
		typescript: 'catalog:',
		vitest: 'catalog:',
	},
};
writeFileSync(join(packageDir, 'package.json'), `${JSON.stringify(packageJson, null, '\t')}\n`);

const tsconfig = {
	extends: '../../../tsconfig.base.json',
	compilerOptions: isClient
		? { lib: ['ES2022', 'DOM', 'DOM.Iterable'], outDir: './dist', rootDir: './src' }
		: { outDir: './dist', rootDir: './src' },
	include: ['src/**/*'],
};
writeFileSync(join(packageDir, 'tsconfig.json'), `${JSON.stringify(tsconfig, null, '\t')}\n`);

const indexTs = `/**
 * Placeholder function for the ${npmName} package — replace with real exports.
 * @param subject the name to greet
 * @returns a greeting for the given subject
 */
export function greet(subject: string): string {
	return \`Hello, \${subject}!\`;
}
`;
writeFileSync(join(packageDir, 'src', 'index.ts'), indexTs);

const indexTest = `import { describe, expect, it } from 'vitest';
import { greet } from './index';

describe('greet', () => {
	it('greets the given subject', () => {
		expect(greet('world')).toBe('Hello, world!');
	});
});
`;
writeFileSync(join(packageDir, 'src', 'index.test.ts'), indexTest);

const commonNote =
	category === 'common'
		? "\n> `common/` doit rester isomorphe : pas d'API exclusivement DOM ou exclusivement Node.\n"
		: '';
const readme = `# ${npmName}
${commonNote}
TODO: décrire le package.

## Installation

\`\`\`bash
pnpm add ${npmName}
\`\`\`

## Usage

TODO
`;
writeFileSync(join(packageDir, 'README.md'), readme);

// Édite le tsconfig.json racine (project references)
const rootTsconfigPath = join(ROOT, 'tsconfig.json');
const rootTsconfig = JSON.parse(readFileSync(rootTsconfigPath, 'utf8'));
rootTsconfig.references ??= [];
rootTsconfig.references.push({ path: `./packages/${category}/${name}` });
writeFileSync(rootTsconfigPath, `${JSON.stringify(rootTsconfig, null, '\t')}\n`);

// Ajoute une ligne au registre des packages
const packagesSpecPath = join(ROOT, 'spec', 'packages.md');
const packagesSpec = readFileSync(packagesSpecPath, 'utf8');
const newRow = `| \`${npmName}\` | ${category} | 0.0.1 | brouillon |\n`;
writeFileSync(packagesSpecPath, packagesSpec.trimEnd() + '\n' + newRow);

console.log(`Package ${npmName} créé dans packages/${category}/${name}/.`);

try {
	// shell: true est nécessaire sous Windows, où `pnpm` est un shim .cmd/.ps1
	// que execFileSync ne résout pas via PATHEXT sans passer par un shell.
	execFileSync('pnpm', ['install'], { cwd: ROOT, stdio: 'inherit', shell: true });
	execFileSync(
		'pnpm',
		[
			'exec',
			'biome',
			'check',
			'--write',
			`packages/${category}/${name}`,
			'tsconfig.json',
			'spec/packages.md',
		],
		{ cwd: ROOT, stdio: 'inherit', shell: true },
	);
} catch (error) {
	console.error('Étape automatique échouée, à relancer toi-même :');
	console.error('  pnpm install');
	console.error(
		`  pnpm exec biome check --write packages/${category}/${name} tsconfig.json spec/packages.md`,
	);
	console.error(String(error));
}

console.log('\nProchaines étapes :');
console.log(`  cd packages/${category}/${name}`);
console.log('  - compléter la description dans package.json et README.md');
console.log(`  - pnpm --filter ${npmName} test`);
console.log('  - pnpm changeset (une fois prêt à publier)');