// Copyright (c) The Avalonia Project. All rights reserved.
// Licensed under the MIT license. See licence.md file in the project root for full license information.

using Avalonia.Data;
using Avalonia.Input;
using Avalonia.Platform;
using Avalonia.UnitTests;
using Moq;
using Xunit;

namespace Avalonia.Controls.UnitTests
{
    public class TextBoxTests
    {
        [Fact]
        public void DefaultBindingMode_Should_Be_TwoWay()
        {
            Assert.Equal(
                BindingMode.TwoWay,
                TextBox.TextProperty.GetMetadata(typeof(TextBox)).DefaultBindingMode);
        }

        [Fact]
        public void Control_Backspace_Should_Remove_The_Word_Before_The_Caret_If_There_Is_No_Selection()
        {
            AvaloniaLocator.CurrentMutable
                .Bind<IPlatformThreadingInterface>()
                .ToConstant(TestServices.MockThreadingInterface.ThreadingInterface);

            TextBox textBox = new TextBox
            {
                Text = "First Second Third Fourth",
                CaretIndex = 5
            };

            // (First| Second Third Fourth)
            RaiseKeyEvent(textBox, Key.Back, InputModifiers.Control);
            Assert.Equal(" Second Third Fourth", textBox.Text);

            // ( Second |Third Fourth)
            textBox.CaretIndex = 8;
            RaiseKeyEvent(textBox, Key.Back, InputModifiers.Control);
            Assert.Equal(" Third Fourth", textBox.Text);

            // ( Thi|rd Fourth)
            textBox.CaretIndex = 4;
            RaiseKeyEvent(textBox, Key.Back, InputModifiers.Control);
            Assert.Equal(" rd Fourth", textBox.Text);

            // ( rd F[ou]rth)
            textBox.SelectionStart = 5;
            textBox.SelectionEnd = 7;

            RaiseKeyEvent(textBox, Key.Back, InputModifiers.Control);
            Assert.Equal(" rd Frth", textBox.Text);

            // ( |rd Frth)
            textBox.CaretIndex = 1;
            RaiseKeyEvent(textBox, Key.Back, InputModifiers.Control);
            Assert.Equal("rd Frth", textBox.Text);
        }

        [Fact]
        public void Control_Delete_Should_Remove_The_Word_After_The_Caret_If_There_Is_No_Selection()
        {
            AvaloniaLocator.CurrentMutable
                .Bind<IPlatformThreadingInterface>()
                .ToConstant(TestServices.MockThreadingInterface.ThreadingInterface);

            TextBox textBox = new TextBox
            {
                Text = "First Second Third Fourth",
                CaretIndex = 19
            };

            // (First Second Third |Fourth)
            RaiseKeyEvent(textBox, Key.Delete, InputModifiers.Control);
            Assert.Equal("First Second Third ", textBox.Text);

            // (First Second| Third )
            textBox.CaretIndex = 12;
            RaiseKeyEvent(textBox, Key.Delete, InputModifiers.Control);
            Assert.Equal("First Second ", textBox.Text);

            // (First Sec|ond )
            textBox.CaretIndex = 9;
            RaiseKeyEvent(textBox, Key.Delete, InputModifiers.Control);
            Assert.Equal("First Sec ", textBox.Text);

            // (Fi[rs]t Sec )
            textBox.SelectionStart = 2;
            textBox.SelectionEnd = 4;

            RaiseKeyEvent(textBox, Key.Delete, InputModifiers.Control);
            Assert.Equal("Fit Sec ", textBox.Text);

            // (Fit Sec| )
            textBox.CaretIndex = 7;
            RaiseKeyEvent(textBox, Key.Delete, InputModifiers.Control);
            Assert.Equal("Fit Sec", textBox.Text);
        }

        private void RaiseKeyEvent(TextBox textBox, Key key, InputModifiers inputModifiers)
        {
            textBox.RaiseEvent(new KeyEventArgs
            {
                RoutedEvent = InputElement.KeyDownEvent,
                Modifiers = inputModifiers,
                Key = key
            });
        }
    }
}