using UnityEngine;
using UnityEngine.Rendering.Universal;

namespace RR.Common.Entities
{
    public class LightActionsController : MonoBehaviour
    {
        private enum Mode { Blink, Pulse, Noise, Curve }

        [Header("Target")]
        [SerializeField] private Light[] lights3D;
        [SerializeField] private Light2D[] lights2D;
        [Tooltip("Доп. вариант — крутить эмиссию материала (опционально)")]
        [SerializeField] private Renderer emissiveRenderer;
        private static readonly int EmissionColorID = Shader.PropertyToID("_EmissionColor");

        [Header("Mode")]
        [SerializeField] private Mode mode = Mode.Blink;

        [Header("Intensity")]
        [SerializeField] private float minIntensity = 0f;
        [SerializeField] private float maxIntensity = 1f;

        [Header("Timings")]
        [SerializeField] private float frequency = 2f;       // Гц для Pulse/Noise, миганий/сек для Blink
        [SerializeField, Range(0f, 1f)] private float duty = 0.2f;          // Доля времени ON для Blink [0..1]
        [SerializeField] private AnimationCurve curve = AnimationCurve.EaseInOut(0, 0, 1, 1);
        [SerializeField] private bool useUnscaledTime = false;

        [Header("Randomness (optional)")]
        [SerializeField, Range(0f, 1f)] private float noiseAmplitude = 0.3f; // для Noise (0..1)
        [SerializeField] private float noiseSpeed = 1.0f;     // скорость «пламени»
        [SerializeField] private Vector2 blinkJitter = new(-0.1f, 0.1f); // случайный сдвиг фазы Blink

        [Header("Color (optional)")]
        [SerializeField] private bool modulateColor = false;
        [SerializeField] private Gradient colorOverCycle;

        private float _blinkOffset;
        private Material _matInstance;
        private Color _baseEmission = Color.white;

        private void Reset()
        {
            lights3D = GetComponentsInChildren<Light>();
            lights2D = GetComponentsInChildren<Light2D>();
            emissiveRenderer = GetComponent<Renderer>();
        }

        private void Awake()
        {
            if (emissiveRenderer && emissiveRenderer.sharedMaterial && _matInstance == null)
            {
                _matInstance = emissiveRenderer.material;
                if (_matInstance.HasProperty(EmissionColorID))
                {
                    _baseEmission = _matInstance.GetColor(EmissionColorID);
                    _matInstance.EnableKeyword("_EMISSION");
                }
            }
            _blinkOffset = Random.Range(blinkJitter.x, blinkJitter.y);
        }

        private void Update()
        {
            float time = useUnscaledTime ? Time.unscaledTime : Time.time;

            float phase;
            float k; // 0..1

            switch (mode)
            {
                case Mode.Blink:
                    // пила с джиттером
                    phase = Mathf.Repeat((time + _blinkOffset) * Mathf.Max(0.0001f, frequency), 1f);
                    k = phase < Mathf.Clamp01(duty) ? 1f : 0f;
                    break;

                case Mode.Pulse:
                    // синус → 0..1
                    k = 0.5f * (1f + Mathf.Sin(time * Mathf.PI * 2f * frequency));
                    break;

                case Mode.Noise:
                    // Perlin: базовый уровень + шум
                    float u = time * noiseSpeed;
                    float n = Mathf.PerlinNoise(u, 0.123f);      // 0..1
                    float baseK = 0.5f * (1f + Mathf.Sin(time * Mathf.PI * 2f * frequency)); // мягкий пульс
                    k = Mathf.Clamp01(baseK * (1f - noiseAmplitude) + n * noiseAmplitude);
                    break;

                case Mode.Curve:
                    // цикл 0..1 по частоте, кривой задаём форму
                    phase = Mathf.Repeat(time * Mathf.Max(0.0001f, frequency), 1f);
                    k = Mathf.Clamp01(curve.Evaluate(phase));
                    break;

                default:
                    k = 1f; break;
            }

            float intensity = Mathf.Lerp(minIntensity, maxIntensity, k);
            ApplyIntensity(intensity);
            if (modulateColor && colorOverCycle != null)
            {
                ApplyColor(colorOverCycle.Evaluate(k));
            }
        }

        private void ApplyIntensity(float value)
        {
            if (lights3D != null)
                foreach (var t in lights3D)
                    if (t) t.intensity = value;

            if (lights2D != null)
                foreach (var t in lights2D)
                    if (t) t.intensity = value;

            if (_matInstance && _matInstance.HasProperty(EmissionColorID))
                _matInstance.SetColor(EmissionColorID, _baseEmission * value);
        }

        private void ApplyColor(Color c)
        {
            if (lights3D != null)
                foreach (var t in lights3D)
                    if (t) t.color = c;

            if (lights2D != null)
                foreach (var t in lights2D)
                    if (t) t.color = c;

            if (_matInstance && _matInstance.HasProperty(EmissionColorID))
                _matInstance.SetColor(EmissionColorID, c * Mathf.Max(0.0001f, _matInstance.GetColor(EmissionColorID).maxColorComponent));
        }

        void OnDestroy()
        {
            if (_matInstance) Destroy(_matInstance);
        }
    }
}