// Copyright 2013 The Flutter Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

import 'dart:io' as io;

import 'package:args/args.dart';
import 'package:golden_tests_harvester/golden_tests_harvester.dart';
import 'package:skia_gold_client/skia_gold_client.dart';

final bool _isLocalEnvWithoutSkiaGold =
    !SkiaGoldClient.isAvailable(environment: io.Platform.environment) ||
    !SkiaGoldClient.isLuciEnv(environment: io.Platform.environment);

final ArgParser _argParser = ArgParser()
  ..addFlag(
    'help',
    abbr: 'h',
    negatable: false,
    help: 'Prints this usage information.',
  )
  ..addFlag(
    'dry-run',
    defaultsTo: _isLocalEnvWithoutSkiaGold,
    help: 'Do not upload images to Skia Gold.',
  );

Future<void> main(List<String> args) async {
  final ArgResults results = _argParser.parse(args);
  if (results['help'] as bool) {
    io.stdout.writeln(_argParser.usage);
    return;
  }

  final List<String> rest = results.rest;
  if (rest.length != 1) {
    io.stderr.writeln('Error: Must provide exactly one argument.');
    io.stderr.writeln(_argParser.usage);
    io.exitCode = 1;
    return;
  }

  final io.Directory workDirectory = io.Directory(rest.single);
  final bool isDryRun = results['dry-run'] as bool;
  final Harvester harvester;
  if (isDryRun) {
    io.stderr.writeln('=== DRY RUN. Results not submitted to Skia Gold. ===');
    harvester =
      await Harvester.create(workDirectory, io.stderr,
        addImageToSkiaGold: _dryRunAddImg);
  } else {
    harvester =
      await Harvester.create(workDirectory, io.stderr);
  }
  await harvest(harvester);
}

Future<void> _dryRunAddImg(
  String testName,
  io.File goldenFile, {
  required int screenshotSize,
  double differentPixelsRate = 0.01,
  int pixelColorDelta = 0,
}) async {
  io.stderr.writeln('addImg '
    'testName:$testName '
    'goldenFile:${goldenFile.path} '
    'screenshotSize:$screenshotSize '
    'differentPixelsRate:$differentPixelsRate '
    'pixelColorDelta:$pixelColorDelta',
  );
}