const fs = require('fs');
const path = require('path');
const gulp = require('gulp');
const ts = require('gulp-typescript');
const gulpSequence = require('gulp-sequence');
const sourcemaps = require('gulp-sourcemaps');
const clean = require('gulp-clean');

const packages = {
  common: ts.createProject('packages/common/tsconfig.json'),
  core: ts.createProject('packages/core/tsconfig.json'),
  microservices: ts.createProject('packages/microservices/tsconfig.json'),
  websockets: ts.createProject('packages/websockets/tsconfig.json'),
  testing: ts.createProject('packages/testing/tsconfig.json'),
};
const modules = Object.keys(packages);
const source = 'packages';
const distId = process.argv.indexOf('--dist');
const dist = distId < 0 ? 'node_modules/@nestjs' : process.argv[distId + 1];

gulp.task('default', function() {
  modules.forEach(module => {
    gulp.watch(
      [`${source}/${module}/**/*.ts`, `${source}/${module}/*.ts`],
      [module]
    );
  });
});

gulp.task('copy:ts', function() {
  return gulp.packages(['packages/**/*.ts']).pipe(gulp.dest('./bundle'));
});

gulp.task('clean:bundle', function() {
  return gulp
    .packages(['bundle/**/*.js.map', 'bundle/**/*.ts', '!bundle/**/*.d.ts'], { read: false })
    .pipe(clean());
});

modules.forEach(module => {
  gulp.task(module, () => {
    return packages[module]
      .src()
      .pipe(packages[module]())
      .pipe(gulp.dest(`${dist}/${module}`));
  });
});

modules.forEach(module => {
  gulp.task(module + ':dev', () => {
    return packages[module]
      .src()
      .pipe(sourcemaps.init())
      .pipe(packages[module]())
      .pipe(
        sourcemaps.mapSources(sourcePath => './' + sourcePath.split('/').pop())
      )
      .pipe(sourcemaps.write('.'))
      .pipe(gulp.dest(`${dist}/${module}`));
  });
});

gulp.task('build', function(cb) {
  gulpSequence('common', modules.filter(module => module !== 'common'), cb);
});

gulp.task('build:dev', function(cb) {
  gulpSequence(
    'common:dev',
    modules
      .filter(module => module !== 'common')
      .map(module => module + ':dev'),
    'copy:ts',
    cb
  );
});

function getFolders(dir) {
  return fs.readdirSync(dir).filter(function(file) {
    return fs.statSync(path.join(dir, file)).isDirectory();
  });
}
gulp.task('move', function() {
  const getDirs = (base) => getFolders(base)
    .map((path) => `${base}/${path}`);

  const examplesDirs = getDirs('sample');
  const integrationDirs = getDirs('integration');
  const directories = examplesDirs.concat(integrationDirs);

  let stream = gulp
    .src(['node_modules/@nestjs/**/*']);

  directories.forEach((dir) => {
    stream = stream.pipe(gulp.dest(dir + '/node_modules/@nestjs'));
  });
});