using UnityEngine;
using UnityEngine.InputSystem;

namespace ProjectM.Client
{
    /// <summary>
    /// Gamepad rumble for combat feel — a static bridge (mirrors <see cref="FeelConfig"/> / <see cref="AimPresentation"/>).
    /// <see cref="Pulse"/> sets the motors and stamps a stop time; <see cref="Tick"/> (called once per frame from
    /// <c>CombatFeedbackSystem</c>) stops them when the pulse elapses OR the app loses focus, so a rumble never sticks.
    /// A no-op when no pad is connected; the CALLER gates to the Gamepad scheme. Statics survive fast-enter-playmode
    /// reloads, so <see cref="ResetState"/> re-arms clean on play-enter and stops any leaked motor (the AimPresentation
    /// reset idiom). Presentation-only, main-thread, never touches the simulation.
    /// </summary>
    public static class RumbleUtil
    {
        static float s_StopTime;
        static bool s_Active;

        [RuntimeInitializeOnLoadMethod(RuntimeInitializeLoadType.SubsystemRegistration)]
        static void ResetState()
        {
            s_Active = false;
            s_StopTime = 0f;
            Stop();
        }

        /// <summary>Pulse both motors at the given low/high strengths for durSec, then auto-stop. No-op without a pad.</summary>
        public static void Pulse(float low, float high, float durSec)
        {
            var pad = Gamepad.current;
            if (pad == null) return;
            pad.SetMotorSpeeds(Mathf.Clamp01(low), Mathf.Clamp01(high));
            s_StopTime = Time.unscaledTime + Mathf.Max(0.02f, durSec);
            s_Active = true;
        }

        /// <summary>Call once per frame: stops the motors when the pulse elapses or focus is lost.</summary>
        public static void Tick()
        {
            if (!s_Active) return;
            if (!Application.isFocused || Time.unscaledTime >= s_StopTime)
            {
                Stop();
                s_Active = false;
            }
        }

        static void Stop()
        {
            var pad = Gamepad.current;
            if (pad != null) pad.ResetHaptics();
        }
    }
}