const path = require("path");
const fs = require("fs");

const frappe_path = path.resolve(__dirname, "..");
const bench_path = path.resolve(frappe_path, "..", "..");
const sites_path = path.resolve(bench_path, "sites");
const apps_path = path.resolve(bench_path, "apps");
const assets_path = path.resolve(sites_path, "assets");
const app_list = get_apps_list();

const app_paths = app_list.reduce((out, app) => {
	out[app] = path.resolve(apps_path, app, app);
	return out;
}, {});
const public_paths = app_list.reduce((out, app) => {
	out[app] = path.resolve(app_paths[app], "public");
	return out;
}, {});
const public_js_paths = app_list.reduce((out, app) => {
	out[app] = path.resolve(app_paths[app], "public/js");
	return out;
}, {});

const bundle_map = app_list.reduce((out, app) => {
	const public_js_path = public_js_paths[app];
	if (fs.existsSync(public_js_path)) {
		const all_files = fs.readdirSync(public_js_path);
		const js_files = all_files.filter(file => file.endsWith(".js"));

		for (let js_file of js_files) {
			const filename = path.basename(js_file).split(".")[0];
			out[path.join(app, "js", filename)] = path.resolve(
				public_js_path,
				js_file
			);
		}
	}

	return out;
}, {});

const get_public_path = app => public_paths[app];

const get_build_json_path = app =>
	path.resolve(get_public_path(app), "build.json");

function get_build_json(app) {
	try {
		return require(get_build_json_path(app));
	} catch (e) {
		// build.json does not exist
		return null;
	}
}

function delete_file(path) {
	if (fs.existsSync(path)) {
		fs.unlinkSync(path);
	}
}

function run_serially(tasks) {
	let result = Promise.resolve();
	tasks.forEach(task => {
		if (task) {
			result = result.then ? result.then(task) : Promise.resolve();
		}
	});
	return result;
}

const get_app_path = app => app_paths[app];

const get_options_for_scss = () => {
	const node_modules_path = path.resolve(
		get_app_path("frappe"),
		"..",
		"node_modules"
	);
	const app_paths = app_list
		.map(get_app_path)
		.map(app_path => path.resolve(app_path, ".."));

	return {
		includePaths: [node_modules_path, ...app_paths]
	};
};

function get_apps_list() {
	return fs
		.readFileSync(path.resolve(sites_path, "apps.txt"), {
			encoding: "utf-8"
		})
		.split("\n")
		.filter(Boolean);
}

function get_cli_arg(name) {
	let args = process.argv.slice(2);

	for (let i in args) {
		let arg = args[i];
		let value = null;
		if (arg == `--${name}`) {
			value = true;
		}
		if (args[i + 1]) {
			value = args[i + 1];
		}
		if (value) {
			return value;
		}
	}
}

module.exports = {
	app_list,
	bench_path,
	assets_path,
	sites_path,
	apps_path,
	bundle_map,
	get_public_path,
	get_build_json_path,
	get_build_json,
	get_app_path,
	delete_file,
	run_serially,
	get_options_for_scss,
	get_cli_arg
};