// Copyright 2015 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

library mojom.command.check;

import 'dart:async';
import 'dart:io';

import 'package:args/args.dart';
import 'package:args/command_runner.dart';
import 'package:mojom/src/commands/mojom_command.dart';
import 'package:mojom/src/generate.dart';
import 'package:mojom/src/utils.dart';
import 'package:path/path.dart' as path;

class CheckCommand extends MojomCommand {
  String get name => 'check';
  String get description => "Check bindings generated by the 'gen' command "
      "against a canonical source";
  String get invocation =>
      'mojom.dart check -c path/to/canon -r mojoms/ -o dart-packages/';

  Directory _canon;
  Directory _dartRoot;

  CheckCommand() {
    argParser.addOption('canon',
        abbr: 'c',
        help: 'Directory containing canonical .mojom.dart bindings.');
    argParser.addOption('output',
        abbr: 'o',
        defaultsTo: Directory.current.path,
        help: 'Directory containing Dart packages.');
  }

  run() async {
    MojomCommand.setupLogging();
    await _validateArguments();
    var treeChecker =
        new TreeChecker(mojoSdk, mojomRoot, _dartRoot, _canon, skips);
    await treeChecker.check();
    return treeChecker.errors;
  }

  _validateArguments() async {
    await validateArguments();

    if (argResults['canon'] == null) {
      throw new CommandLineError("The 'tree-check' command requires a --canon"
          " argument.");
    }
    _canon = new Directory(makeAbsolute(argResults['canon']));
    if (!await _canon.exists()) {
      throw new CommandLineError("The specified canonical output directory: "
          "$_canon does not exist.");
    }
    _dartRoot = new Directory(makeAbsolute(argResults['output']));
    if (!await _dartRoot.exists()) {
      throw new CommandLineError(
          'Specified --output directory $_dartRoot does not exist');
    }
  }
}