/**
 * @license
 * Copyright (c) 2016 The Polymer Project Authors. All rights reserved.
 * This code may only be used under the BSD style license found at
 * http://polymer.github.io/LICENSE.txt The complete set of authors may be found
 * at http://polymer.github.io/AUTHORS.txt The complete set of contributors may
 * be found at http://polymer.github.io/CONTRIBUTORS.txt Code distributed by
 * Google as part of the polymer project is also subject to an additional IP
 * rights grant found at http://polymer.github.io/PATENTS.txt
 */

'use strict';

const depcheck = require('depcheck');
const eslint = require('gulp-eslint');
const fs = require('fs-extra');
const gulp = require('gulp');
const mergeStream = require('merge-stream');
const mocha = require('gulp-spawn-mocha');
const path = require('path');
const runSeq = require('run-sequence');
const tslint = require('gulp-tslint');
const typescript = require('gulp-typescript');

const tsProject = typescript.createProject('tsconfig.json');

gulp.task('lint', ['tslint', 'eslint', 'depcheck']);

gulp.task('clean', (done) => {
  fs.remove(path.join(__dirname, 'lib'), done);
});

gulp.task('build', ['clean'], () => {
  let tsReporter = typescript.reporter.defaultReporter();
  return mergeStream(
             tsProject.src().pipe(tsProject(tsReporter)),
             gulp.src(['src/**/*', '!src/**/*.ts']))
      .pipe(gulp.dest('lib'));
});

gulp.task(
    'test',
    ['build'],
    () => gulp.src('test/unit/**/*_test.js', {read: false}).pipe(mocha({
      ui: 'tdd',
      reporter: 'spec',
    })));

gulp.task(
    'test:integration',
    ['build'],
    () =>
        gulp.src(['test/integration/**/*_test.js'], {read: false}).pipe(mocha({
          ui: 'tdd',
          reporter: 'spec',
        })));


gulp.task(
    'tslint',
    () => gulp.src('src/**/*.ts')
              .pipe(tslint({
                configuration: 'tslint.json',
                formatter: 'verbose',
              }))
              .pipe(tslint.report()));

gulp.task(
    'eslint',
    () => gulp.src('test/**/*_test.js')
              .pipe(eslint())
              .pipe(eslint.format())
              .pipe(eslint.failAfterError()));

gulp.task(
    'depcheck',
    () => depcheck(__dirname, {
            // "@types/*" dependencies are type declarations that are
            // automatically
            // loaded by TypeScript during build. depcheck can't detect this
            // so we ignore them here.
            ignoreMatches: ['@types/*', 'vinyl']
          }).then((result) => {
      let invalidFiles = Object.keys(result.invalidFiles) || [];
      let invalidJsFiles = invalidFiles.filter((f) => f.endsWith('.js'));
      if (invalidJsFiles.length > 0) {
        throw new Error(`Invalid files: ${invalidJsFiles}`);
      }
      if (result.dependencies.length) {
        throw new Error(`Unused dependencies: ${result.dependencies}`);
      }
    }));
