#!/usr/bin/env node

'use strict';

const {exec} = require('child-process-promise');

const {existsSync} = require('fs');

const {join} = require('path');

const {execRead, logPromise} = require('../utils');

const theme = require('../theme');

const run = async ({cwd, local, packages, version}) => {

  if (local) {

    // Sanity test

    if (!existsSync(join(cwd, 'build', 'node_modules', 'react'))) {

      console.error(theme.error`No local build exists.`);

      process.exit(1);

    }

    return;

  }

  if (!existsSync(join(cwd, 'build'))) {

    await exec(`mkdir ./build`, {cwd});

  }

  // Cleanup from previous builds

  await exec(`rm -rf ./build/node_modules*`, {cwd});

  await exec(`mkdir ./build/node_modules`, {cwd});

  const nodeModulesPath = join(cwd, 'build/node_modules');

  // Checkout "next" release from NPM for all local packages

  for (let i = 0; i < packages.length; i++) {

    const packageName = packages[i];

    // We previously used `npm install` for this,

    // but in addition to checking out a lot of transient dependencies that we don't care about–

    // the NPM client also added a lot of registry metadata to the package JSONs,

    // which we had to remove as a separate step before re-publishing.

    // It's easier for us to just download and extract the tarball.

    const url = await execRead(

      `npm view ${packageName}@${version} dist.tarball`

    );

    const filePath = join(nodeModulesPath, `${packageName}.tgz`);

    const packagePath = join(nodeModulesPath, `${packageName}`);

    const tempPackagePath = join(nodeModulesPath, 'package');

    // Download packages from NPM and extract them to the expected build locations.

    await exec(`curl -L ${url} > ${filePath}`, {cwd});

    await exec(`tar -xvzf ${filePath} -C ${nodeModulesPath}`, {cwd});

    await exec(`mv ${tempPackagePath} ${packagePath}`, {cwd});

    await exec(`rm ${filePath}`, {cwd});

  }

};

module.exports = async params => {

  return logPromise(

    run(params),

    theme`Checking out "next" from NPM {version ${params.version}}`

  );

};