using System;
using System.Threading;
using OpenQA.Selenium.Appium;
using OpenQA.Selenium.Interactions;
using Xunit;

namespace Avalonia.IntegrationTests.Appium;

[Collection("Default")]
public class DragDropTests : TestBase
{
    public DragDropTests(DefaultAppFixture fixture)
        : base(fixture, "DragDrop")
    {
        var reset = Session.FindElementByAccessibilityId("ResetDragDrop");
        reset.Click();
    }

    [PlatformFact(TestPlatforms.MacOS)]
    public void DragDrop_Coordinates_Correct_When_Controls_Offset_From_Origin()
    {
        // This test verifies the fix for drag-drop coordinate calculation when
        // controls are positioned away from the window origin.
        // Issue: In embedded views or when controls have margin/offset from origin,
        // the drag-drop coordinates were incorrectly calculated relative to the
        // window rather than the view.

        var dragSource = Session.FindElementByAccessibilityId("DragSource");
        var dropTarget = Session.FindElementByAccessibilityId("DropTarget");
        var dropPosition = Session.FindElementByAccessibilityId("DropPosition");
        var dragDropStatus = Session.FindElementByAccessibilityId("DragDropStatus");

        // Perform drag from source to target
        new Actions(Session)
            .MoveToElement(dragSource)
            .ClickAndHold()
            .MoveToElement(dropTarget)
            .Release()
            .Perform();

        Thread.Sleep(500); // Allow UI to update

        // Verify the drop was successful
        var status = dragDropStatus.Text;
        Assert.True(status == "Drop OK" || status == "Copied",
            $"Expected drop to succeed, but status was: {status}");

        // Verify the drop position is within the target bounds
        // If the coordinate calculation bug exists, the position would be
        // offset by the spacer/margin and would show negative coordinates
        // or coordinates outside the target bounds
        var positionText = dropPosition.Text;
        Assert.StartsWith("Drop:", positionText, StringComparison.Ordinal);

        // The DropTargetText should not contain "ERROR"
        var dropTargetText = Session.FindElementByAccessibilityId("DropTargetText");
        Assert.DoesNotContain("ERROR", dropTargetText.Text);
    }

    [PlatformFact(TestPlatforms.MacOS)]
    public void DragDrop_Position_Updates_During_DragOver()
    {
        // Verifies that position is correctly reported during drag-over events
        var dragSource = Session.FindElementByAccessibilityId("DragSource");
        var dropTarget = Session.FindElementByAccessibilityId("DropTarget");
        var dropPosition = Session.FindElementByAccessibilityId("DropPosition");

        // Start drag and move over target, then release
        var device = new PointerInputDevice(PointerKind.Mouse);
        var builder = new ActionBuilder();

        // Move to drag source and start drag
        builder.AddAction(device.CreatePointerMove(dragSource, 0, 0, TimeSpan.FromMilliseconds(100)));
        builder.AddAction(device.CreatePointerDown(MouseButton.Left));

        // Move to drop target (this triggers DragOver events)
        builder.AddAction(device.CreatePointerMove(dropTarget, 0, 0, TimeSpan.FromMilliseconds(200)));

        // Pause to allow DragOver events to be processed
        builder.AddAction(device.CreatePause(TimeSpan.FromMilliseconds(200)));

        // Release at current position (completes the drag)
        builder.AddAction(device.CreatePointerUp(MouseButton.Left));

        Session.PerformActions(builder.ToActionSequenceList());

        Thread.Sleep(200);

        // Check that position was recorded (either DragOver or Drop)
        var positionText = dropPosition.Text;

        // Position should have been updated during drag-over or drop
        Assert.True(positionText.Contains("DragOver:") || positionText.Contains("Drop:"),
            $"Expected position to be updated during drag, but got: {positionText}");
    }

    [Fact]
    public void DragDrop_Can_Be_Cancelled()
    {
        var dragSource = Session.FindElementByAccessibilityId("DragSource");
        var dragDropStatus = Session.FindElementByAccessibilityId("DragDropStatus");

        // Start drag but release outside any drop target
        new Actions(Session)
            .MoveToElement(dragSource)
            .ClickAndHold()
            .MoveByOffset(-200, 0) // Move away from drop target
            .Release()
            .Perform();

        Thread.Sleep(500);

        // Status should indicate cancelled
        var status = dragDropStatus.Text;
        Assert.Equal("Cancelled", status);
    }
}