using AcDream.App.Combat;
using AcDream.App.Diagnostics;
using AcDream.App.Rendering;
using AcDream.App.UI;
using AcDream.UI.Abstractions.Input;

namespace AcDream.App.Input;

internal interface IRetainedGameplayWindowCommands
{
    void ToggleInventory();
}

internal sealed class RetainedGameplayWindowCommands(RetailUiRuntime? runtime)
    : IRetainedGameplayWindowCommands
{
    private readonly RetailUiRuntime? _runtime = runtime;

    public void ToggleInventory() =>
        _runtime?.ToggleWindow(WindowNames.Inventory);
}

internal interface IDevToolsGameplayCommands
{
    void ToggleDebugPanel();

    void FocusChatInput();

    void ToggleSettingsPanel();
}

internal sealed class DevToolsGameplayCommands(DevToolsFramePresenter? presenter)
    : IDevToolsGameplayCommands
{
    private readonly DevToolsFramePresenter? _presenter = presenter;

    public void ToggleDebugPanel() => _presenter?.ToggleDebugPanel();

    public void FocusChatInput() => _presenter?.FocusChatInput();

    public void ToggleSettingsPanel() => _presenter?.ToggleSettingsPanel();
}

internal interface IPlayerModeGameplayCommands
{
    bool IsPlayerMode { get; }

    void ToggleFlyOrChase();

    void TogglePlayerMode();

    void ExitPlayerMode();
}

internal sealed class PlayerModeGameplayCommands(
    ILocalPlayerModeSource mode,
    PlayerModeController controller) : IPlayerModeGameplayCommands
{
    private readonly ILocalPlayerModeSource _mode = mode
        ?? throw new ArgumentNullException(nameof(mode));
    private readonly PlayerModeController _controller = controller
        ?? throw new ArgumentNullException(nameof(controller));

    public bool IsPlayerMode => _mode.IsPlayerMode;

    public void ToggleFlyOrChase() => _controller.ToggleFlyOrChase();

    public void TogglePlayerMode() => _controller.Toggle();

    public void ExitPlayerMode() => _controller.Exit();
}

internal interface IItemTargetModeCommands
{
    bool IsAnyTargetModeActive { get; }

    void CancelTargetMode();
}

internal sealed class ItemTargetModeCommands(ItemInteractionController items)
    : IItemTargetModeCommands
{
    private readonly ItemInteractionController _items = items
        ?? throw new ArgumentNullException(nameof(items));

    public bool IsAnyTargetModeActive => _items.IsAnyTargetModeActive;

    public void CancelTargetMode() => _items.CancelTargetMode();
}

internal interface IGameplayCameraModeCommands
{
    bool IsFlyMode { get; }

    void ExitFlyMode();
}

internal sealed class GameplayCameraModeCommands(CameraController camera)
    : IGameplayCameraModeCommands
{
    private readonly CameraController _camera = camera
        ?? throw new ArgumentNullException(nameof(camera));

    public bool IsFlyMode => _camera.IsFlyMode;

    public void ExitFlyMode() => _camera.ToggleFly();
}

internal interface IGameplayWindowCommands
{
    void Close();
}

internal sealed class GameplayWindowCommands(Action close) : IGameplayWindowCommands
{
    private readonly Action _close = close
        ?? throw new ArgumentNullException(nameof(close));

    public void Close() => _close();
}

internal interface IGameplayInputCommandTarget
{
    bool Handle(InputAction action);
}

/// <summary>
/// Owns the final command tier of the frozen gameplay-action priority graph.
/// It coordinates canonical owners but stores no UI, camera, player, combat,
/// item-target, or diagnostic state of its own.
/// </summary>
internal sealed class GameplayInputCommandController : IGameplayInputCommandTarget
{
    private readonly IRetainedGameplayWindowCommands _retained;
    private readonly IDevToolsGameplayCommands _devTools;
    private readonly IRuntimeDiagnosticCommands _diagnostics;
    private readonly IPlayerModeGameplayCommands _playerMode;
    private readonly IItemTargetModeCommands _targetMode;
    private readonly IGameplayCameraModeCommands _camera;
    private readonly ILiveCombatModeCommand _combat;
    private readonly IGameplayWindowCommands _window;

    public GameplayInputCommandController(
        IRetainedGameplayWindowCommands retained,
        IDevToolsGameplayCommands devTools,
        IRuntimeDiagnosticCommands diagnostics,
        IPlayerModeGameplayCommands playerMode,
        IItemTargetModeCommands targetMode,
        IGameplayCameraModeCommands camera,
        ILiveCombatModeCommand combat,
        IGameplayWindowCommands window)
    {
        _retained = retained ?? throw new ArgumentNullException(nameof(retained));
        _devTools = devTools ?? throw new ArgumentNullException(nameof(devTools));
        _diagnostics = diagnostics ?? throw new ArgumentNullException(nameof(diagnostics));
        _playerMode = playerMode ?? throw new ArgumentNullException(nameof(playerMode));
        _targetMode = targetMode ?? throw new ArgumentNullException(nameof(targetMode));
        _camera = camera ?? throw new ArgumentNullException(nameof(camera));
        _combat = combat ?? throw new ArgumentNullException(nameof(combat));
        _window = window ?? throw new ArgumentNullException(nameof(window));
    }

    public bool Handle(InputAction action)
    {
        if (_diagnostics.Handle(action))
            return true;

        switch (action)
        {
            case InputAction.ToggleInventoryPanel:
                _retained.ToggleInventory();
                return true;
            case InputAction.AcdreamToggleDebugPanel:
                _devTools.ToggleDebugPanel();
                return true;
            case InputAction.AcdreamToggleFlyMode:
                _playerMode.ToggleFlyOrChase();
                return true;
            case InputAction.AcdreamTogglePlayerMode:
                _playerMode.TogglePlayerMode();
                return true;
            case InputAction.ToggleChatEntry:
                _devTools.FocusChatInput();
                return true;
            case InputAction.ToggleOptionsPanel:
                _devTools.ToggleSettingsPanel();
                return true;
            case InputAction.CombatToggleCombat:
                _combat.Toggle();
                return true;
            case InputAction.EscapeKey:
                HandleEscape();
                return true;
            default:
                return false;
        }
    }

    private void HandleEscape()
    {
        if (_targetMode.IsAnyTargetModeActive)
            _targetMode.CancelTargetMode();
        else if (_camera.IsFlyMode)
            _camera.ExitFlyMode();
        else if (_playerMode.IsPlayerMode)
            _playerMode.ExitPlayerMode();
        else
            _window.Close();
    }
}