const fs = require('fs');

const args = process.argv.slice(2);

function parsePackageInfo(path){
    const packagecontents = JSON.parse(fs.readFileSync(path, { encoding: 'utf-8' }));
    packagecontents.dependencies = Object.entries(packagecontents.dependencies || {});
    packagecontents.devDependencies = Object.entries(packagecontents.devDependencies || {});
    return packagecontents;
}

function mergeDependencies(packageInfo){
    return [].concat(packageInfo.dependencies, packageInfo.devDependencies);
}

function getDependencyLicenseInfo(all_dependencies, recursive){
	let all = [];

	all_dependencies.forEach((p) => {
		const packageinfo = parsePackageInfo(`./node_modules/${p[0]}/package.json`);
		let licensetext = '';
		if (fs.existsSync(`./node_modules/${p[0]}/LICENSE.md`)) {
			licensetext = fs.readFileSync(`./node_modules/${p[0]}/LICENSE.md`, { encoding: 'utf-8' });
		}
		if (fs.existsSync(`./node_modules/${p[0]}/LICENSE`)) {
			licensetext = fs.readFileSync(`./node_modules/${p[0]}/LICENSE`, { encoding: 'utf-8' });
		}
		if (fs.existsSync(`./node_modules/${p[0]}/LICENSE.txt`)) {
			licensetext = fs.readFileSync(`./node_modules/${p[0]}/LICENSE.txt`, { encoding: 'utf-8' });
		}
		const info = {
			author: packageinfo.author,
			repo: packageinfo.repository || packageinfo.repository.url,
			description: packageinfo.description,
			name: packageinfo.name,
			license: packageinfo.license,
			licensetext
		};
		all.push(info);
		if(recursive == true){
			all.push(...getDependencyLicenseInfo(packageinfo.dependencies, true));
		}
	});
	return all;
}
const packageInfo = parsePackageInfo(`./package.json`);
const all = getDependencyLicenseInfo(mergeDependencies(packageInfo), args.includes("--recursive"));

if(args.includes("--pretty")){
	fs.writeFileSync('./licenses.json', JSON.stringify(all, null, 4));
}
else{
	fs.writeFileSync('./licenses.json', JSON.stringify(all));
}