import path from 'path';
import url from 'url';
import fs from 'fs';
import child_process from 'child_process';
import selfsigned from 'selfsigned';
import findCacheDir from 'find-cache-dir';

export function getBuildInfo(build) {
    let remote = child_process.execSync('git config --get remote.origin.url').toString().trim();
    let commit = child_process.execSync('git rev-parse --short HEAD').toString().trim();

    if (remote.indexOf('git@') === 0) {
        remote = remote.replace(':', '/').replace('git@', 'https://');
    }

    let parsed = url.parse(remote);
    let newPath = parsed.path.slice(0, parsed.path.lastIndexOf('.') > -1 ? parsed.path.lastIndexOf('.') : undefined);
    let newUrl = parsed.protocol + '//' + parsed.host + newPath + '/commit/' + commit;

    return {
        info: commit,
        url: newUrl,
        time: new Date().toISOString(),
        env: build
    }
}

export async function getDistPath(packageName, assetPath) {
    if (assetPath === undefined)
        assetPath = '';
    // make sure the package exists to avoid typos
    await getPackagePath(packageName, '');
    return path.join('local', packageName, assetPath);
}

export async function getPackagePath(packageName, assetPath) {
    let packageRoot;
    let current = require.resolve('./package.json');
    if (require(current).name === packageName) {
        // current package
        packageRoot = path.dirname(current);
    } else {
        // Other packages from nodes_modules etc.
        packageRoot = path.dirname(require.resolve(packageName + '/package.json'));
    }
    return path.relative(process.cwd(), path.join(packageRoot, assetPath));
}

/**
 * Creates a dummy dev server certificate, caches it and returns it.
 */
export async function generateTLSConfig() {
    const certDir = findCacheDir({name: 'dbp-dev-server-cert'});
    const keyPath = path.join(certDir, 'server.key');
    const certPath = path.join(certDir, 'server.cert');

    await fs.promises.mkdir(certDir, {recursive: true});

    if (!fs.existsSync(keyPath) || !fs.existsSync(certPath)) {
        const attrs = [{name: 'commonName', value: 'dbp-dev.localhost'}];
        const pems = selfsigned.generate(attrs, {algorithm: 'sha256', days: 9999, keySize: 2048});
        await fs.promises.writeFile(keyPath, pems.private);
        await fs.promises.writeFile(certPath, pems.cert);
    }

    return {
        key: await fs.promises.readFile(keyPath),
        cert: await fs.promises.readFile(certPath)
    }
}