/**
 * @license
 * Copyright 2019 Balena Ltd.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *    http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

import { run as oclifRun } from '@oclif/dev-cli';
import * as archiver from 'archiver';
import * as Bluebird from 'bluebird';
import { execFile } from 'child_process';
import { stripIndent } from 'common-tags';
import * as filehound from 'filehound';
import * as fs from 'fs-extra';
import * as _ from 'lodash';
import * as path from 'path';
import { exec as execPkg } from 'pkg';
import * as rimraf from 'rimraf';
import * as semver from 'semver';
import * as util from 'util';

import {
	getSubprocessStdout,
	loadPackageJson,
	MSYS2_BASH,
	ROOT,
	whichSpawn,
} from './utils';

export const packageJSON = loadPackageJson();
export const version = 'v' + packageJSON.version;
const arch = process.arch;

function dPath(...paths: string[]) {
	return path.join(ROOT, 'dist', ...paths);
}

interface PathByPlatform {
	[platform: string]: string;
}

const standaloneZips: PathByPlatform = {
	linux: dPath(`balena-cli-${version}-linux-${arch}-standalone.zip`),
	darwin: dPath(`balena-cli-${version}-macOS-${arch}-standalone.zip`),
	win32: dPath(`balena-cli-${version}-windows-${arch}-standalone.zip`),
};

const oclifInstallers: PathByPlatform = {
	darwin: dPath('macos', `balena-${version}.pkg`),
	win32: dPath('win', `balena-${version}-${arch}.exe`),
};

const renamedOclifInstallers: PathByPlatform = {
	darwin: dPath(`balena-cli-${version}-macOS-${arch}-installer.pkg`),
	win32: dPath(`balena-cli-${version}-windows-${arch}-installer.exe`),
};

export const finalReleaseAssets: { [platform: string]: string[] } = {
	win32: [standaloneZips['win32'], renamedOclifInstallers['win32']],
	darwin: [standaloneZips['darwin'], renamedOclifInstallers['darwin']],
	linux: [standaloneZips['linux']],
};

/**
 * Use the 'pkg' module to create a single large executable file with
 * the contents of 'node_modules' and the CLI's javascript code.
 * Also copy a number of native modules (binary '.node' files) that are
 * compiled during 'npm install' to the 'build-bin' folder, alongside
 * the single large executable file created by pkg. (This is necessary
 * because of a pkg limitation that does not allow binary executables
 * to be directly executed from inside another binary executable.)
 */
async function buildPkg() {
	const args = [
		'--target',
		'host',
		'--output',
		'build-bin/balena',
		'package.json',
	];
	console.log('=======================================================');
	console.log(`execPkg ${args.join(' ')}`);
	console.log(`cwd="${process.cwd()}" ROOT="${ROOT}"`);
	console.log('=======================================================');

	await execPkg(args);

	const paths: Array<[string, string[], string[]]> = [
		// [platform, [source path], [destination path]]
		['*', ['open', 'xdg-open'], ['xdg-open']],
		['darwin', ['denymount', 'bin', 'denymount'], ['denymount']],
	];
	await Bluebird.map(paths, ([platform, source, dest]) => {
		if (platform === '*' || platform === process.platform) {
			// eg copy from node_modules/open/xdg-open to build-bin/xdg-open
			return fs.copy(
				path.join(ROOT, 'node_modules', ...source),
				path.join(ROOT, 'build-bin', ...dest),
			);
		}
	});
	const nativeExtensionPaths: string[] = await filehound
		.create()
		.paths(path.join(ROOT, 'node_modules'))
		.ext(['node', 'dll'])
		.find();

	console.log(`\nCopying to build-bin:\n${nativeExtensionPaths.join('\n')}`);

	await Bluebird.map(nativeExtensionPaths, extPath =>
		fs.copy(
			extPath,
			extPath.replace(
				path.join(ROOT, 'node_modules'),
				path.join(ROOT, 'build-bin'),
			),
		),
	);
}

/**
 * Run some basic tests on the built pkg executable.
 * TODO: test more than just `balena version -j`; integrate with the
 * existing mocha/chai CLI command testing.
 */
async function testPkg() {
	type JsonVersions = import('../lib/actions-oclif/version').JsonVersions;
	const pkgBalenaPath = path.join(
		ROOT,
		'build-bin',
		process.platform === 'win32' ? 'balena.exe' : 'balena',
	);
	console.log(`Testing standalone package "${pkgBalenaPath}"...`);
	// Run `balena version -j`, parse its stdout as JSON, and check that the
	// reported Node.js major version matches semver.major(process.version)
	const stdout = await getSubprocessStdout(pkgBalenaPath, ['version', '-j']);
	let pkgNodeVersion = '';
	let pkgNodeMajorVersion = 0;
	try {
		const balenaVersions: JsonVersions = JSON.parse(stdout);
		pkgNodeVersion = balenaVersions['Node.js'];
		pkgNodeMajorVersion = semver.major(pkgNodeVersion);
	} catch (err) {
		throw new Error(stripIndent`
			Error parsing JSON output of "balena version -j": ${err}
			Original output: "${stdout}"`);
	}
	if (semver.major(process.version) !== pkgNodeMajorVersion) {
		throw new Error(
			`Mismatched major version: built-in pkg Node version="${pkgNodeVersion}" vs process.version="${process.version}"`,
		);
	}
	console.log('Success! (standalone package test successful)');
}

/**
 * Create the zip file for the standalone 'pkg' bundle previously created
 * by the buildPkg() function in 'build-bin.ts'.
 */
async function zipPkg() {
	const outputFile = standaloneZips[process.platform];
	if (!outputFile) {
		throw new Error(
			`Standalone installer unavailable for platform "${process.platform}"`,
		);
	}
	await fs.mkdirp(path.dirname(outputFile));
	await new Promise((resolve, reject) => {
		console.log(`Zipping standalone package to "${outputFile}"...`);

		const archive = archiver('zip', {
			zlib: { level: 7 },
		});
		archive.directory(path.join(ROOT, 'build-bin'), 'balena-cli');

		const outputStream = fs.createWriteStream(outputFile);

		outputStream.on('close', resolve);
		outputStream.on('error', reject);

		archive.on('error', reject);
		archive.on('warning', console.warn);

		archive.pipe(outputStream);
		archive.finalize();
	});
}

export async function buildStandaloneZip() {
	console.log(`Building standalone zip package for CLI ${version}`);
	try {
		await buildPkg();
		await testPkg();
		await zipPkg();
	} catch (error) {
		console.log(`Error creating or testing standalone zip package:\n ${error}`);
		process.exit(1);
	}
	console.log(`Standalone zip package build completed`);
}

async function renameInstallerFiles() {
	if (await fs.pathExists(oclifInstallers[process.platform])) {
		await fs.rename(
			oclifInstallers[process.platform],
			renamedOclifInstallers[process.platform],
		);
	}
}

/**
 * If the CSC_LINK and CSC_KEY_PASSWORD env vars are set, digitally sign the
 * executable installer by running the balena-io/scripts/shared/sign-exe.sh
 * script (which must be in the PATH) using a MSYS2 bash shell.
 */
async function signWindowsInstaller() {
	if (process.env.CSC_LINK && process.env.CSC_KEY_PASSWORD) {
		const exeName = renamedOclifInstallers[process.platform];
		const execFileAsync = util.promisify<string, string[], void>(execFile);

		console.log(`Signing installer "${exeName}"`);
		await execFileAsync(MSYS2_BASH, [
			'sign-exe.sh',
			'-f',
			exeName,
			'-d',
			`balena-cli ${version}`,
		]);
	} else {
		console.log(
			'Skipping installer signing step because CSC_* env vars are not set',
		);
	}
}

/**
 * Run the `oclif-dev pack:win` or `pack:macos` command (depending on the value
 * of process.platform) to generate the native installers (which end up under
 * the 'dist' folder). There are some harcoded options such as selecting only
 * 64-bit binaries under Windows.
 */
export async function buildOclifInstaller() {
	let packOS = '';
	let packOpts = ['-r', ROOT];
	if (process.platform === 'darwin') {
		packOS = 'macos';
	} else if (process.platform === 'win32') {
		packOS = 'win';
		packOpts = packOpts.concat('-t', 'win32-x64');
	}
	if (packOS) {
		console.log(`Building oclif installer for CLI ${version}`);
		const packCmd = `pack:${packOS}`;
		const dirs = [path.join(ROOT, 'dist', packOS)];
		if (packOS === 'win') {
			dirs.push(path.join(ROOT, 'tmp', 'win*'));
		}
		for (const dir of dirs) {
			console.log(`rimraf(${dir})`);
			await Bluebird.fromCallback(cb => rimraf(dir, cb));
		}
		console.log('=======================================================');
		console.log(`oclif-dev "${packCmd}" "${packOpts.join('" "')}"`);
		console.log(`cwd="${process.cwd()}" ROOT="${ROOT}"`);
		console.log('=======================================================');
		await oclifRun([packCmd].concat(...packOpts));
		await renameInstallerFiles();
		// The Windows installer is explicitly signed here (oclif doesn't do it).
		// The macOS installer is automatically signed by oclif (which runs the
		// `pkgbuild` tool), using the certificate name given in package.json
		// (`oclif.macos.sign` section).
		if (process.platform === 'win32') {
			await signWindowsInstaller();
		}
		console.log(`oclif installer build completed`);
	}
}

/**
 * Wrapper around the npm `catch-uncommitted` package in order to run it
 * conditionally, only when:
 * - A CI env var is set (CI=true), and
 * - The OS is not Windows. (`catch-uncommitted` fails on Windows)
 */
export async function catchUncommitted(): Promise<void> {
	if (process.env.DEBUG) {
		console.error(`[debug] CI=${process.env.CI} platform=${process.platform}`);
	}
	if (
		process.env.CI &&
		['true', 'yes', '1'].includes(process.env.CI.toLowerCase()) &&
		process.platform !== 'win32'
	) {
		await whichSpawn('npx', [
			'catch-uncommitted',
			'--catch-no-git',
			'--skip-node-versionbot-changes',
			'--ignore-space-at-eol',
		]);
	}
}