using System;
using System.Collections.Generic;
using UnityEngine;
using UnityEngine.InputSystem;
using UnityEngine.InputSystem.Layouts;
using UnityEngine.InputSystem.LowLevel;

/// <summary>
/// Мост из твоего фасада In (COM/клава и т.д.) в новый Input System.
/// Создаёт виртуальный Gamepad и обновляет его состояние на основе:
///  - действий игроков (PlayerAction), или
///  - физических пинов (int / ButtonPinMapping)
/// Выбирай способ через списки маппинга в инспекторе.
/// </summary>
[DefaultExecutionOrder(-100)] // пораньше, чтобы UI увидел ввод
public class ComInputToInputSystemAdapter : MonoBehaviour
{
    [Header("Источник состояния")]
    [Tooltip("Если true — брать состояние из In.GetButton* AnyPlayer; если false — из CurrentPlayer.")]
    public bool useAnyPlayer = true;

    [Header("Маппинг по действиям (PlayerAction -> Gamepad)")]
    public List<ActionBinding> actionBindings = new();

    [Header("Маппинг по пинам (индекс пина -> Gamepad)")]
    public List<PinBinding> pinBindings = new();

    [Header("Отладка")]
    public bool logCreateDevice = true;

    private static Gamepad _virtualPad;
    private GamepadState _state;

    // Защита от дублей при отключённом Domain Reload
    private static bool _deviceCreated;

    [Serializable]
    public struct ActionBinding
    {
        public PlayerAction action;            // твой enum
        public TargetTarget target;
        public GamepadButton button;           // если target == Button
        public DpadDir dpadDirection;          // если target == Dpad
    }

    [Serializable]
    public struct PinBinding
    {
        public int pinIndex;                   // твой физический индекс пина
        public TargetTarget target;
        public GamepadButton button;           // если target == Button
        public DpadDir dpadDirection;          // если target == Dpad
    }

    public enum TargetTarget { Button, Dpad }
    public enum DpadDir { Up, Down, Left, Right }

    private void Awake()
    {
        Initialize();
    }

    private void OnEnable() => Initialize();

    private void Update()
    {
        if (_virtualPad == null) return;

        _state = default;

        // 1) По действиям
        foreach (ActionBinding b in actionBindings)
        {
            bool pressed = useAnyPlayer
                ? In.GetButtonAnyPlayer(b.action)
                : In.GetButtonCurrentPlayer(b.action);

            ApplyBinding(ref _state, b.target, b.button, b.dpadDirection, pressed);
        }

        // 2) По пинам
        foreach (PinBinding b in pinBindings)
        {
            bool pressed = In.GetButton(b.pinIndex);
            ApplyBinding(ref _state, b.target, b.button, b.dpadDirection, pressed);
        }

        InputSystem.QueueStateEvent(_virtualPad, _state);
        // Обновлять InputSystem вручную не нужно (обновится в цикле Unity)
    }

    public void Initialize()
    {
        EnsureVirtualGamepad();
        TryAddDefaultBindingsIfEmpty();
    }
    
    private static void ApplyBinding(ref GamepadState st, TargetTarget target, GamepadButton btn, DpadDir dir, bool pressed)
    {
        if (!pressed) return;

        if (target == TargetTarget.Button)
        {
            st = st.WithButton(btn);
        }
        else
        {
            st = dir switch
            {
                DpadDir.Up => st.WithButton(GamepadButton.DpadUp),
                DpadDir.Down => st.WithButton(GamepadButton.DpadDown),
                DpadDir.Left => st.WithButton(GamepadButton.DpadLeft),
                DpadDir.Right => st.WithButton(GamepadButton.DpadRight),
                _ => st
            };
        }
    }

    private void EnsureVirtualGamepad()
    {
        if (_deviceCreated && _virtualPad != null) return;

        // ищем уже созданный «COM Bridge», чтобы не дублировать
        foreach (InputDevice dev in InputSystem.devices)
        {
            if (dev is not Gamepad { description: { product: "COM Bridge Gamepad" } } gp) continue;
            _virtualPad = gp;
            _deviceCreated = true;
            return;
        }

        InputDeviceDescription desc = new()
        {
            interfaceName = "Virtual",
            deviceClass = "Gamepad",
            product = "COM Bridge Gamepad",
            manufacturer = "Robotic Retailers"
        };

        _virtualPad = (Gamepad)InputSystem.AddDevice(desc);
        _deviceCreated = true;
        if (logCreateDevice) Debug.Log("[InputBridge] Виртуальный Gamepad создан: " + _virtualPad);
    }

    private void TryAddDefaultBindingsIfEmpty()
    {
        // Если пусто — добавим базовый маппинг стрелок на D-Pad.
        if (actionBindings.Count != 0) return;
        
        TryAddActionBinding(PlayerAction.up,    TargetTarget.Dpad, GamepadButton.North, DpadDir.Up);
        TryAddActionBinding(PlayerAction.down,  TargetTarget.Dpad, GamepadButton.South, DpadDir.Down);
        TryAddActionBinding(PlayerAction.left,  TargetTarget.Dpad, GamepadButton.West,  DpadDir.Left);
        TryAddActionBinding(PlayerAction.right, TargetTarget.Dpad, GamepadButton.East,  DpadDir.Right);
        
        TryAddActionBinding(PlayerAction.action, TargetTarget.Button, GamepadButton.South, DpadDir.Up);
        TryAddActionBinding(PlayerAction.action, TargetTarget.Button, GamepadButton.East, DpadDir.Up);
        
        // SafeTry(() => actionBindings.Add(new ActionBinding { action = PlayerAction.action, target = TargetTarget.Button, button = GamepadButton.South, dpadDirection = DpadDir.Up }));
        // SafeTry(() => actionBindings.Add(new ActionBinding { action = PlayerAction.extra,  target = TargetTarget.Button, button = GamepadButton.East,  dpadDirection = DpadDir.Up }));
    }

    private void TryAddActionBinding(PlayerAction action, TargetTarget target, GamepadButton btn, DpadDir dir)
    {
        SafeTry(() => actionBindings.Add(new ActionBinding { action = action, target = target, button = btn, dpadDirection = dir }));
    }

    private static void SafeTry(Action a)
    {
        try { a(); } catch { /* если в твоём enum нет таких значений — просто пропустим */ }
    }
}