/**
 * @license
 * Copyright 2018 Google LLC. All Rights Reserved.
 * 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 * as fs from 'fs';
import {join} from 'path';
import * as semver from 'semver';
import * as shell from 'shelljs';

// Exit if any commands error.
shell.set('-e');
process.on('unhandledRejection', e => {
  throw e;
});

const dir = '.';
const dirs = fs.readdirSync(dir)
                 .filter(f => fs.statSync(join(dir, f)).isDirectory())
                 .filter(f => !f.startsWith('.') && f !== 'node_modules');

function assertPeerDepSatisfied(peerDeps, devDeps, dependencyName, dir) {
  const peerDep = peerDeps[dependencyName];
  const devDep = devDeps[dependencyName];
  if (peerDep != null && devDep != null) {
    // Use the min version because semver.satisfies needs to compare a version
    // to a range.
    const minDevDepInPeerDepRange =
        semver.satisfies(semver.minVersion(devDep).version, peerDep);
    if (!minDevDepInPeerDepRange) {
      throw new Error(
          `devDependency version (${devDep}) does not satisfy ` +
          `peerDepency version (${peerDep}) of ${dependencyName} ` +
          `in ${dir}.`);
    }
  }
}

function assertCaretDep(depsMap, dependencyName, dir, depType) {
  const dep = depsMap[dependencyName];
  if (dep != null) {
    if (!dep.startsWith('^')) {
      throw new Error(
          `${depType} version (${dep}) of ${dependencyName} for ` +
          `${dir} must start with ^.`);
    }
  }
}

dirs.forEach(dir => {
  if (!fs.existsSync(`${dir}/package.json`) || dir === 'clone') {
    return;
  }

  console.log(`~~~~~~~~~~~~ Building ${dir} ~~~~~~~~~~~~`);

  shell.cd(dir);

  const pkg = JSON.parse(fs.readFileSync('package.json').toString());
  // Make sure peer dependencies and dev dependencies of tfjs match, and make
  // sure the version uses ^.
  const peerDeps = pkg.peerDependencies;
  const devDeps = pkg.devDependencies;

  assertCaretDep(peerDeps, '@tensorflow/tfjs', dir, 'peerDep');
  assertCaretDep(peerDeps, '@tensorflow/tfjs-core', dir, 'peerDep');
  assertCaretDep(peerDeps, '@tensorflow/tfjs-converter', dir, 'peerDep');

  assertCaretDep(devDeps, '@tensorflow/tfjs', dir, 'devDep');
  assertCaretDep(devDeps, '@tensorflow/tfjs-core', dir, 'devDep');
  assertCaretDep(devDeps, '@tensorflow/tfjs-converter', dir, 'devDep');

  assertPeerDepSatisfied(peerDeps, devDeps, '@tensorflow/tfjs', dir);
  assertPeerDepSatisfied(peerDeps, devDeps, '@tensorflow/tfjs-core', dir);
  assertPeerDepSatisfied(peerDeps, devDeps, '@tensorflow/tfjs-converter', dir);

  shell.cd('../');
  console.log();
  console.log();
});