using System.Numerics;
using System.Runtime.CompilerServices;
using AcDream.App.Composition;
using AcDream.App.Input;
using AcDream.App.Interaction;
using AcDream.App.Net;
using AcDream.App.Rendering;
using AcDream.App.UI;
using AcDream.App.UI.Layout;
using AcDream.Core.Net;
using AcDream.Core.World;
using AcDream.UI.Abstractions;

namespace AcDream.App.Tests.Composition;

public sealed class InteractionUiRuntimeSourcesTests
{
    [Fact]
    public void DesiredComponentSnapshotNormalizesNullAndClearsExactly()
    {
        var state = new DesiredComponentSnapshotState();
        IReadOnlyList<(uint Id, uint Amount)> items =
            [(0x01020304u, 7u)];

        Assert.Empty(state.Items);
        state.Items = items;
        Assert.Same(items, state.Items);

        state.Clear();
        Assert.Empty(state.Items);
        state.Items = null!;
        Assert.Empty(state.Items);
    }

    [Fact]
    public void SessionAuthorityDefaultsBindUnbindRebindAndDeactivateExactly()
    {
        var source = new DeferredLiveSessionUiAuthority();
        var first = new SessionTarget(true);
        var second = new SessionTarget(false);

        Assert.False(source.IsInWorld);
        Assert.Same(NullCommandBus.Instance, source.Commands);

        IDisposable stale = source.Bind(first);
        Assert.True(source.IsInWorld);
        Assert.Same(first.Commands, source.Commands);
        Assert.Throws<InvalidOperationException>(() => source.Bind(second));

        stale.Dispose();
        IDisposable current = source.Bind(second);
        stale.Dispose();
        Assert.False(source.IsInWorld);
        Assert.Same(second.Commands, source.Commands);

        source.Deactivate();
        current.Dispose();
        Assert.Same(NullCommandBus.Instance, source.Commands);
        Assert.Throws<ObjectDisposedException>(() => source.Bind(first));
    }

    [Fact]
    public void SelectionAuthorityUsesRetailSafeDefaultsAndExactBindingLifetime()
    {
        var source = new DeferredSelectionUiAuthority();
        var query = new SelectionQuery();
        SelectionInteractionController interactions =
            Stub<SelectionInteractionController>();

        Assert.True(source.IsWithinExternalContainerUseRange(1u));
        Assert.False(source.ShouldShowHealth(1u));
        Assert.Null(source.ResolveVividTargetInfo(1u));

        IDisposable binding = source.Bind(query, interactions);
        Assert.False(source.IsWithinExternalContainerUseRange(1u));
        Assert.True(source.ShouldShowHealth(1u));
        Assert.Equal(3f, source.ResolveVividTargetInfo(1u)?.SelectionSphereRadius);
        Assert.Throws<InvalidOperationException>(() => source.Bind(query, interactions));

        binding.Dispose();
        Assert.True(source.IsWithinExternalContainerUseRange(1u));
        source.Deactivate();
        Assert.Throws<ObjectDisposedException>(() => source.Bind(query, interactions));
    }

    [Fact]
    public void RadarNeverCachesAnUnboundBootstrapSnapshot()
    {
        var source = new DeferredRadarSnapshotSource();
        Assert.Same(UiRadarSnapshot.Empty, source.Snapshot());

        var provider = new RadarSnapshotProvider(
            new AcDream.Core.Items.ClientObjectTable(),
            static () => new Dictionary<uint, WorldEntity>(),
            static () => new Dictionary<uint, WorldSession.EntitySpawn>(),
            static () => 0u,
            static () => 0f,
            static () => 0u,
            static () => null,
            static () => false,
            static () => true);
        IDisposable binding = source.Bind(provider);

        Assert.True(source.Snapshot().UiLocked);
        binding.Dispose();
        Assert.False(source.Snapshot().UiLocked);
    }

    [Fact]
    public void AutomationProxyIsInertUntilExactRuntimeBinds()
    {
        var source = new DeferredWorldLifecycleAutomationRuntime();
        Assert.False(source.TryWriteCheckpoint("early", out string earlyError));
        Assert.Contains("not bound", earlyError);

        var target = new AutomationRuntime();
        IDisposable binding = source.Bind(target);
        Assert.True(source.IsWorldReady);
        Assert.True(source.TryWriteCheckpoint("ready", out _));
        Assert.Equal("ready", target.LastCheckpoint);

        binding.Dispose();
        Assert.False(source.IsWorldReady);
        source.Deactivate();
        Assert.Throws<ObjectDisposedException>(() => source.Bind(target));
    }

    [Fact]
    public void ExpectedOwnerBindingReleasesOnce()
    {
        object target = new();
        int releases = 0;
        var binding = new ExpectedOwnerBinding<object>(target, value =>
        {
            Assert.Same(target, value);
            releases++;
        });

        binding.Dispose();
        binding.Dispose();

        Assert.Equal(1, releases);
    }

    [Fact]
    public void RetainedInputCaptureBindingCannotClearAReplacement()
    {
        var slot = new RetainedUiInputCaptureSlot();
        var first = new UiRoot();
        var second = new UiRoot();

        IDisposable stale = slot.Bind(first);
        Assert.Same(first, slot.Root);
        Assert.Throws<InvalidOperationException>(() => slot.Bind(second));
        stale.Dispose();
        IDisposable current = slot.Bind(second);
        stale.Dispose();
        Assert.Same(second, slot.Root);
        current.Dispose();
        Assert.Null(slot.Root);
    }

    [Fact]
    public void LateBindingCleanupRetriesOnlyTheFailedSuffix()
    {
        var bindings = new InteractionUiLateBindings();
        var first = new RetryBinding(failures: 0);
        var second = new RetryBinding(failures: 1);
        bindings.AdoptLateOwnerBinding("first", first);
        bindings.AdoptLateOwnerBinding("second", second);

        Assert.Throws<AggregateException>(bindings.Dispose);
        Assert.Equal(1, first.Calls);
        Assert.Equal(1, second.Calls);

        bindings.Dispose();
        Assert.Equal(1, first.Calls);
        Assert.Equal(2, second.Calls);
        Assert.Throws<ObjectDisposedException>(() =>
            bindings.AdoptLateOwnerBinding("late", new RetryBinding(0)));
    }

    private sealed class SessionTarget(bool inWorld) : ILiveUiSessionTarget
    {
        public bool IsInWorld { get; } = inWorld;
        public WorldSession? CurrentSession => null;
        public ICommandBus Commands { get; } = new LiveCommandBus();
    }

    private sealed class SelectionQuery : IRetainedUiSelectionQuery
    {
        public bool ShouldShowHealth(uint serverGuid) => true;
        public VividTargetInfo? ResolveVividTargetInfo(uint serverGuid) =>
            new(Vector3.Zero, 3f, 0u, 0u);
        public bool IsWithinExternalContainerUseRange(uint serverGuid) => false;
    }

    private sealed class AutomationRuntime
        : AcDream.App.UI.Testing.IRetailUiAutomationRuntime
    {
        public bool IsWorldReady => true;
        public bool IsWorldViewportVisible => true;
        public int PortalMaterializationCount => 2;
        public string? LastCheckpoint { get; private set; }

        public bool TryWriteCheckpoint(string name, out string error)
        {
            LastCheckpoint = name;
            error = string.Empty;
            return true;
        }

        public bool TryRequestScreenshot(string name, out string error)
        {
            error = string.Empty;
            return true;
        }

        public bool IsScreenshotComplete(string name) => true;
    }

    private sealed class RetryBinding(int failures) : IDisposable
    {
        private int _failures = failures;
        public int Calls { get; private set; }

        public void Dispose()
        {
            Calls++;
            if (_failures > 0)
            {
                _failures--;
                throw new InvalidOperationException("retry");
            }
        }
    }

    private static T Stub<T>() where T : class =>
        (T)RuntimeHelpers.GetUninitializedObject(typeof(T));
}