// Copyright (c) 2013, the Dart project authors.  Please see the AUTHORS file
// for details. All rights reserved. Use of this source code is governed by a
// BSD-style license that can be found in the LICENSE file.

/// **Note**: If you already have a `build.dart` in your application, we
/// recommend to use the `package:polymer/builder.dart` library instead.

/// Temporary deploy command used to create a version of the app that can be
/// compiled with dart2js and deployed. Following pub layout conventions, this
/// script will treat any HTML file under a package 'web/' and 'test/'
/// directories as entry points.
///
/// From an application package you can run deploy by creating a small program
/// as follows:
///
///    import "package:polymer/deploy.dart" as deploy;
///    main() => deploy.main();
///
/// This library should go away once `pub deploy` can be configured to run
/// barback transformers.
library polymer.deploy;

import 'dart:io';

import 'package:args/args.dart';
import 'package:code_transformers/tests.dart' show testingDartSdkDirectory;
import 'package:path/path.dart' as path;

import 'src/build/common.dart' show TransformOptions, phasesForPolymer;
import 'src/build/runner.dart';
import 'transformer.dart';

main(List<String> arguments) {
  var args = _parseArgs(arguments);
  if (args == null) exit(1);

  var test = args['test'];
  var outDir = args['out'];

  var options;
  if (test == null) {
    var transformOps = new TransformOptions(
        directlyIncludeJS: args['js'],
        contentSecurityPolicy: args['csp'],
        releaseMode: !args['debug']);
    var phases = createDeployPhases(transformOps);
    options = new BarbackOptions(phases, outDir,
        // TODO(sigmund): include here also smoke transformer when it's on by
        // default.
        packagePhases: {'polymer': phasesForPolymer});
  } else {
    options = _createTestOptions(
        test, outDir, args['js'], args['csp'], !args['debug']);
  }
  if (options == null) exit(1);

  print('polymer/deploy.dart: creating a deploy target for '
      '"${options.currentPackage}"');

  runBarback(options)
      .then((_) => print('Done! All files written to "$outDir"'))
      .catchError(_reportErrorAndExit);
}

BarbackOptions _createTestOptions(String testFile, String outDir,
    bool directlyIncludeJS, bool contentSecurityPolicy, bool releaseMode) {

  var testDir = path.normalize(path.dirname(testFile));

  // A test must be allowed to import things in the package.
  // So we must find its package root, given the entry point. We can do this
  // by walking up to find pubspec.yaml.
  var pubspecDir = _findDirWithFile(path.absolute(testDir), 'pubspec.yaml');
  if (pubspecDir == null) {
    print('error: pubspec.yaml file not found, please run this script from '
        'your package root directory or a subdirectory.');
    return null;
  }
  var packageName = readCurrentPackageFromPubspec(pubspecDir);

  // Find the dart-root so we can include all package dependencies and
  // transformers from other packages.
  var pkgDir = path.join(_findDirWithDir(path.absolute(testDir), 'pkg'), 'pkg');

  var phases = createDeployPhases(new TransformOptions(
      entryPoints: [path.relative(testFile, from: pubspecDir)],
      directlyIncludeJS: directlyIncludeJS,
      contentSecurityPolicy: contentSecurityPolicy,
      releaseMode: releaseMode,
      lint: false), sdkDir: testingDartSdkDirectory);
  var dirs = {};
  // Note: we include all packages in pkg/ to keep things simple. Ideally this
  // should be restricted to the transitive dependencies of this package.
  _subDirs(pkgDir).forEach((p) { dirs[path.basename(p)] = p; });
  // Note: packageName may be a duplicate of 'polymer', but that's ok (they
  // should be the same value).
  dirs[packageName]= pubspecDir;
  return new BarbackOptions(phases, outDir,
      currentPackage: packageName,
      packageDirs: dirs,
      // TODO(sigmund): include here also smoke transformer when it's on by
      // default.
      packagePhases: {'polymer': phasesForPolymer},
      transformTests: true);
}

String _findDirWithFile(String dir, String filename) {
  while (!new File(path.join(dir, filename)).existsSync()) {
    var parentDir = path.dirname(dir);
    // If we reached root and failed to find it, bail.
    if (parentDir == dir) return null;
    dir = parentDir;
  }
  return dir;
}

String _findDirWithDir(String dir, String subdir) {
  while (!new Directory(path.join(dir, subdir)).existsSync()) {
    var parentDir = path.dirname(dir);
    // If we reached root and failed to find it, bail.
    if (parentDir == dir) return null;
    dir = parentDir;
  }
  return dir;
}

List<String> _subDirs(String dir) =>
    new Directory(dir).listSync(followLinks: false)
        .where((d) => d is Directory).map((d) => d.path).toList();

void _reportErrorAndExit(e, trace) {
  print('Uncaught error: $e');
  if (trace != null) print(trace);
  exit(1);
}

ArgResults _parseArgs(arguments) {
  var parser = new ArgParser()
      ..addFlag('help', abbr: 'h', help: 'Displays this help message.',
          defaultsTo: false, negatable: false)
      ..addOption('out', abbr: 'o', help: 'Directory to generate files into.',
          defaultsTo: 'out')
      ..addOption('test', help: 'Deploy the test at the given path.\n'
          'Note: currently this will deploy all tests in its directory,\n'
          'but it will eventually deploy only the specified test.')
      ..addFlag('js', help:
          'deploy replaces *.dart scripts with *.dart.js. This flag \n'
          'leaves "packages/browser/dart.js" to do the replacement at runtime.',
          defaultsTo: true)
      ..addFlag('debug', help:
          'run in debug mode. For example, use the debug polyfill \n'
          'web_components/platform.concat.js instead of the minified one.\n',
          defaultsTo: false)
      ..addFlag('csp', help:
          'replaces *.dart with *.dart.precompiled.js to comply with \n'
          'Content Security Policy restrictions.');
  try {
    var results = parser.parse(arguments);
    if (results['help']) {
      _showUsage(parser);
      return null;
    }
    return results;
  } on FormatException catch (e) {
    print(e.message);
    _showUsage(parser);
    return null;
  }
}

_showUsage(parser) {
  print('Usage: dart --package-root=packages/ '
      'package:polymer/deploy.dart [options]');
  print(parser.getUsage());
}