// Copyright 2014 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 'package:flutter_tools/src/base/command_help.dart';
import 'package:flutter_tools/src/base/logger.dart';
import 'package:flutter_tools/src/base/terminal.dart' show AnsiTerminal, OutputPreferences;
import 'package:meta/meta.dart';
import 'package:platform/platform.dart';

import '../../src/common.dart';
import '../../src/mocks.dart' show MockStdio;

CommandHelp _createCommandHelp({
  @required bool ansi,
  @required int wrapColumn,
}) {
  final Platform platform = FakePlatform(
    stdoutSupportsAnsi: ansi,
  );
  return CommandHelp(
    logger: BufferLogger.test(),
    terminal: AnsiTerminal(
      stdio:  MockStdio(),
      platform: platform,
    ),
    platform: platform,
    outputPreferences: OutputPreferences.test(
      showColor: ansi,
      wrapColumn: wrapColumn,
    ),
  );
}

// Used to use the message length in different scenarios in a DRY way
void _testMessageLength({
  @required bool stdoutSupportsAnsi,
  @required int maxTestLineLength,
  @required int wrapColumn,
}) {
  final CommandHelp commandHelp = _createCommandHelp(
    ansi: stdoutSupportsAnsi,
    wrapColumn: wrapColumn,
  );

  int expectedWidth = maxTestLineLength;

  if (stdoutSupportsAnsi) {
    const int ansiMetaCharactersLength = 33;
    expectedWidth += ansiMetaCharactersLength;
  }

  expect(commandHelp.L.toString().length, lessThanOrEqualTo(expectedWidth));
  expect(commandHelp.P.toString().length, lessThanOrEqualTo(expectedWidth));
  expect(commandHelp.R.toString().length, lessThanOrEqualTo(expectedWidth));
  expect(commandHelp.S.toString().length, lessThanOrEqualTo(expectedWidth));
  expect(commandHelp.U.toString().length, lessThanOrEqualTo(expectedWidth));
  expect(commandHelp.a.toString().length, lessThanOrEqualTo(expectedWidth));
  expect(commandHelp.d.toString().length, lessThanOrEqualTo(expectedWidth));
  expect(commandHelp.h.toString().length, lessThanOrEqualTo(expectedWidth));
  expect(commandHelp.i.toString().length, lessThanOrEqualTo(expectedWidth));
  expect(commandHelp.k.toString().length, lessThanOrEqualTo(expectedWidth));
  expect(commandHelp.o.toString().length, lessThanOrEqualTo(expectedWidth));
  expect(commandHelp.p.toString().length, lessThanOrEqualTo(expectedWidth));
  expect(commandHelp.q.toString().length, lessThanOrEqualTo(expectedWidth));
  expect(commandHelp.r.toString().length, lessThanOrEqualTo(expectedWidth));
  expect(commandHelp.s.toString().length, lessThanOrEqualTo(expectedWidth));
  expect(commandHelp.t.toString().length, lessThanOrEqualTo(expectedWidth));
  expect(commandHelp.v.toString().length, lessThanOrEqualTo(expectedWidth));
  expect(commandHelp.w.toString().length, lessThanOrEqualTo(expectedWidth));
  expect(commandHelp.z.toString().length, lessThanOrEqualTo(expectedWidth));
}

void main() {
  group('CommandHelp', () {
    group('toString', () {

      testWithoutContext('should have a bold command key', () {
        final CommandHelp commandHelp = _createCommandHelp(
          ansi: true,
          wrapColumn: maxLineWidth,
        );

        expect(commandHelp.L.toString(), startsWith('\x1B[1mL\x1B[22m'));
        expect(commandHelp.P.toString(), startsWith('\x1B[1mP\x1B[22m'));
        expect(commandHelp.R.toString(), startsWith('\x1B[1mR\x1B[22m'));
        expect(commandHelp.S.toString(), startsWith('\x1B[1mS\x1B[22m'));
        expect(commandHelp.U.toString(), startsWith('\x1B[1mU\x1B[22m'));
        expect(commandHelp.a.toString(), startsWith('\x1B[1ma\x1B[22m'));
        expect(commandHelp.d.toString(), startsWith('\x1B[1md\x1B[22m'));
        expect(commandHelp.h.toString(), startsWith('\x1B[1mh\x1B[22m'));
        expect(commandHelp.i.toString(), startsWith('\x1B[1mi\x1B[22m'));
        expect(commandHelp.o.toString(), startsWith('\x1B[1mo\x1B[22m'));
        expect(commandHelp.p.toString(), startsWith('\x1B[1mp\x1B[22m'));
        expect(commandHelp.q.toString(), startsWith('\x1B[1mq\x1B[22m'));
        expect(commandHelp.r.toString(), startsWith('\x1B[1mr\x1B[22m'));
        expect(commandHelp.s.toString(), startsWith('\x1B[1ms\x1B[22m'));
        expect(commandHelp.t.toString(), startsWith('\x1B[1mt\x1B[22m'));
        expect(commandHelp.v.toString(), startsWith('\x1B[1mv\x1B[22m'));
        expect(commandHelp.w.toString(), startsWith('\x1B[1mw\x1B[22m'));
        expect(commandHelp.z.toString(), startsWith('\x1B[1mz\x1B[22m'));
      });

      testWithoutContext('commands L,P,S,U,a,i,o,p,t,w should have a grey bolden parenthetical text', () {
        final CommandHelp commandHelp = _createCommandHelp(
          ansi: true,
          wrapColumn: maxLineWidth,
        );

        expect(commandHelp.L.toString(), endsWith('\x1B[1;30m(debugDumpLayerTree)\x1B[39m'));
        expect(commandHelp.P.toString(), endsWith('\x1B[1;30m(WidgetsApp.showPerformanceOverlay)\x1B[39m'));
        expect(commandHelp.S.toString(), endsWith('\x1B[1;30m(debugDumpSemantics)\x1B[39m'));
        expect(commandHelp.U.toString(), endsWith('\x1B[1;30m(debugDumpSemantics)\x1B[39m'));
        expect(commandHelp.a.toString(), endsWith('\x1B[1;30m(debugProfileWidgetBuilds)\x1B[39m'));
        expect(commandHelp.i.toString(), endsWith('\x1B[1;30m(WidgetsApp.showWidgetInspectorOverride)\x1B[39m'));
        expect(commandHelp.o.toString(), endsWith('\x1B[1;30m(defaultTargetPlatform)\x1B[39m'));
        expect(commandHelp.p.toString(), endsWith('\x1B[1;30m(debugPaintSizeEnabled)\x1B[39m'));
        expect(commandHelp.t.toString(), endsWith('\x1B[1;30m(debugDumpRenderTree)\x1B[39m'));
        expect(commandHelp.w.toString(), endsWith('\x1B[1;30m(debugDumpApp)\x1B[39m'));
      });

      testWithoutContext('should not create a help text longer than maxLineWidth without ansi support', () {
        _testMessageLength(
          stdoutSupportsAnsi: false,
          wrapColumn: 0,
          maxTestLineLength: maxLineWidth,
        );
      });

      testWithoutContext('should not create a help text longer than maxLineWidth with ansi support', () {
        _testMessageLength(
          stdoutSupportsAnsi: true,
          wrapColumn: 0,
          maxTestLineLength: maxLineWidth,
        );
      });

      testWithoutContext('should not create a help text longer than outputPreferences.wrapColumn without ansi support', () {
        _testMessageLength(
          stdoutSupportsAnsi: false,
          wrapColumn: OutputPreferences.kDefaultTerminalColumns,
          maxTestLineLength: OutputPreferences.kDefaultTerminalColumns,
        );
      });

      testWithoutContext('should not create a help text longer than outputPreferences.wrapColumn with ansi support', () {
        _testMessageLength(
          stdoutSupportsAnsi: true,
          wrapColumn: OutputPreferences.kDefaultTerminalColumns,
          maxTestLineLength: OutputPreferences.kDefaultTerminalColumns,
        );
      });

      testWithoutContext('should create the correct help text with ansi support', () {
        final CommandHelp commandHelp = _createCommandHelp(
          ansi: true,
          wrapColumn: maxLineWidth,
        );

        expect(commandHelp.L.toString(), equals('\x1B[1mL\x1B[22m Dump layer tree to the console.                               \x1B[1;30m(debugDumpLayerTree)\x1B[39m'));
        expect(commandHelp.P.toString(), equals('\x1B[1mP\x1B[22m Toggle performance overlay.                    \x1B[1;30m(WidgetsApp.showPerformanceOverlay)\x1B[39m'));
        expect(commandHelp.R.toString(), equals('\x1B[1mR\x1B[22m Hot restart.'));
        expect(commandHelp.S.toString(), equals('\x1B[1mS\x1B[22m Dump accessibility tree in traversal order.                   \x1B[1;30m(debugDumpSemantics)\x1B[39m'));
        expect(commandHelp.U.toString(), equals('\x1B[1mU\x1B[22m Dump accessibility tree in inverse hit test order.            \x1B[1;30m(debugDumpSemantics)\x1B[39m'));
        expect(commandHelp.a.toString(), equals('\x1B[1ma\x1B[22m Toggle timeline events for all widget build methods.    \x1B[1;30m(debugProfileWidgetBuilds)\x1B[39m'));
        expect(commandHelp.d.toString(), equals('\x1B[1md\x1B[22m Detach (terminate "flutter run" but leave application running).'));
        expect(commandHelp.h.toString(), equals('\x1B[1mh\x1B[22m Repeat this help message.'));
        expect(commandHelp.i.toString(), equals('\x1B[1mi\x1B[22m Toggle widget inspector.                  \x1B[1;30m(WidgetsApp.showWidgetInspectorOverride)\x1B[39m'));
        expect(commandHelp.o.toString(), equals('\x1B[1mo\x1B[22m Simulate different operating systems.                      \x1B[1;30m(defaultTargetPlatform)\x1B[39m'));
        expect(commandHelp.p.toString(), equals('\x1B[1mp\x1B[22m Toggle the display of construction lines.                  \x1B[1;30m(debugPaintSizeEnabled)\x1B[39m'));
        expect(commandHelp.q.toString(), equals('\x1B[1mq\x1B[22m Quit (terminate the application on the device).'));
        expect(commandHelp.r.toString(), equals('\x1B[1mr\x1B[22m Hot reload. $fire$fire$fire'));
        expect(commandHelp.s.toString(), equals('\x1B[1ms\x1B[22m Save a screenshot to flutter.png.'));
        expect(commandHelp.t.toString(), equals('\x1B[1mt\x1B[22m Dump rendering tree to the console.                          \x1B[1;30m(debugDumpRenderTree)\x1B[39m'));
        expect(commandHelp.v.toString(), equals('\x1B[1mv\x1B[22m Launch DevTools.'));
        expect(commandHelp.w.toString(), equals('\x1B[1mw\x1B[22m Dump widget hierarchy to the console.                               \x1B[1;30m(debugDumpApp)\x1B[39m'));
        expect(commandHelp.z.toString(), equals('\x1B[1mz\x1B[22m Toggle elevation checker.'));
      });

      testWithoutContext('should create the correct help text without ansi support', () {
        final CommandHelp commandHelp = _createCommandHelp(
          ansi: false,
          wrapColumn: maxLineWidth,
        );

        expect(commandHelp.L.toString(), equals('L Dump layer tree to the console.                               (debugDumpLayerTree)'));
        expect(commandHelp.P.toString(), equals('P Toggle performance overlay.                    (WidgetsApp.showPerformanceOverlay)'));
        expect(commandHelp.R.toString(), equals('R Hot restart.'));
        expect(commandHelp.S.toString(), equals('S Dump accessibility tree in traversal order.                   (debugDumpSemantics)'));
        expect(commandHelp.U.toString(), equals('U Dump accessibility tree in inverse hit test order.            (debugDumpSemantics)'));
        expect(commandHelp.a.toString(), equals('a Toggle timeline events for all widget build methods.    (debugProfileWidgetBuilds)'));
        expect(commandHelp.d.toString(), equals('d Detach (terminate "flutter run" but leave application running).'));
        expect(commandHelp.h.toString(), equals('h Repeat this help message.'));
        expect(commandHelp.i.toString(), equals('i Toggle widget inspector.                  (WidgetsApp.showWidgetInspectorOverride)'));
        expect(commandHelp.o.toString(), equals('o Simulate different operating systems.                      (defaultTargetPlatform)'));
        expect(commandHelp.p.toString(), equals('p Toggle the display of construction lines.                  (debugPaintSizeEnabled)'));
        expect(commandHelp.q.toString(), equals('q Quit (terminate the application on the device).'));
        expect(commandHelp.r.toString(), equals('r Hot reload. $fire$fire$fire'));
        expect(commandHelp.s.toString(), equals('s Save a screenshot to flutter.png.'));
        expect(commandHelp.t.toString(), equals('t Dump rendering tree to the console.                          (debugDumpRenderTree)'));
        expect(commandHelp.v.toString(), equals('v Launch DevTools.'));
        expect(commandHelp.w.toString(), equals('w Dump widget hierarchy to the console.                               (debugDumpApp)'));
        expect(commandHelp.z.toString(), equals('z Toggle elevation checker.'));
      });
    });
  });
}