using UnityEngine;
using UnityEngine.InputSystem;
using UnityEngine.InputSystem.LowLevel;

namespace NightclubArcadia.Core
{
    /// <summary>
    /// Which input device was most recently active, globally.
    ///
    /// InteractionPrompt — and anything else that shows a button glyph — reads Current
    /// to decide between "[F]", "(X)" and "(✕)".
    ///
    /// Requires the Input System package, with Active Input Handling set to
    /// "Input System Package (New)" or "Both".
    /// </summary>
    public static class InputDeviceTracker
    {
        public enum DeviceType { Keyboard, Xbox, PlayStation, Generic }

        public static DeviceType Current { get; private set; } = DeviceType.Keyboard;

        [RuntimeInitializeOnLoadMethod]
        static void Init()
        {
            InputSystem.onEvent += OnEvent;
        }

        static void OnEvent(InputEventPtr eventPtr, InputDevice device)
        {
            // Only actual state changes — button, stick, key — not every event.
            if (!eventPtr.IsA<StateEvent>() && !eventPtr.IsA<DeltaStateEvent>())
            {
                return;
            }

            switch (device)
            {
                case Keyboard:
                case Mouse:
                    Current = DeviceType.Keyboard;
                    break;

                case Gamepad pad:
                    var name = pad.displayName.ToLowerInvariant();
                    if (name.Contains("dualshock") || name.Contains("dualsense") || name.Contains("playstation"))
                    {
                        Current = DeviceType.PlayStation;
                    }
                    else if (name.Contains("xbox") || name.Contains("xinput"))
                    {
                        Current = DeviceType.Xbox;
                    }
                    else
                    {
                        Current = DeviceType.Generic;
                    }
                    break;
            }
        }
    }
}