using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using UnityEngine.VFX;

namespace AibisDream.FixSystem
{
    /// <summary>
    /// 模块运行状态的纯表现层：Module Pic 始终显示，文字负责常亮/闪烁/熄灭，
    /// 火花依据 Module Pic 的世界包围盒收束在底边，并渲染在本体下层。
    /// </summary>
    public class ModuleConditionVisual : MonoBehaviour
    {
        private static readonly Vector2[] SparkDirections =
        {
            new(-0.5f, -0.86f),
            new(0f, -0.86f),
            new(0.5f, -0.86f)
        };

        [Header("模块引用")]
        [SerializeField] private SpriteRenderer modulePicRenderer;
        [SerializeField] private SpriteRenderer moduleTextRenderer;

        [Header("损坏文字闪烁")]
        [SerializeField, Min(0.01f)] private float flickerMinInterval = 0.06f;
        [SerializeField, Min(0.01f)] private float flickerMaxInterval = 0.18f;

        [Header("损坏火花")]
        [SerializeField] private VisualEffectAsset sparkAsset;
        [SerializeField, Min(0.01f)] private float sparkMinInterval = 0.3f;
        [SerializeField, Min(0.01f)] private float sparkMaxInterval = 1f;
        [SerializeField, Min(0f)] private float sparkBoundsPadding = 0.01f;
        [SerializeField] private Vector2 sparkBoundsScale = new(0.9f, 0.92f);
        [SerializeField] private Vector2 sparkCenterOffset = Vector2.zero;
        [SerializeField] private Vector2 sparkBurstCount = new(3f, 6f);
        [SerializeField] private Vector2 sparkLifetime = new(0.1f, 0.24f);
        [SerializeField] private Vector2 sparkSizeFactor = new(0.032f, 0.065f);
        [SerializeField, Min(0.01f)] private float sparkWidth = 0.45f;
        [SerializeField, Min(0f)] private float sparkVelocityFactor = 0.9f;

        private readonly List<VisualEffect> _sparkEmitters = new();
        private Coroutine _textFlickerCoroutine;
        private Coroutine _sparkCoroutine;
        private Color _originalTextColor = Color.white;
        private ModuleCondition _condition = ModuleCondition.Normal;
        private bool _initialized;
        private bool _hasAppliedCondition;

        public bool IsConfigured => modulePicRenderer != null && moduleTextRenderer != null;

        /// <summary>
        /// 文字当前的亮/灭状态（含 Damaged 闪烁中的瞬时相位），供切割视图入场时对齐。
        /// </summary>
        public bool IsTextCurrentlyVisible => moduleTextRenderer != null && moduleTextRenderer.enabled;

        private void Awake()
        {
            Initialize();
        }

        private void OnEnable()
        {
            if (_initialized && _hasAppliedCondition)
                ApplyConditionInternal(_condition, true);
        }

        private void OnDisable()
        {
            StopRunningEffects();
        }

        public void ApplyCondition(ModuleCondition condition)
        {
            Initialize();
            ApplyConditionInternal(condition, false);
        }

        private void Initialize()
        {
            if (_initialized) return;
            _initialized = true;

            if (moduleTextRenderer != null)
                _originalTextColor = moduleTextRenderer.color;

            CreateSparkEmitters();
        }

        private void ApplyConditionInternal(ModuleCondition condition, bool force)
        {
            if (!force && _hasAppliedCondition && _condition == condition)
                return;

            _condition = condition;
            _hasAppliedCondition = true;
            StopRunningEffects();

            if (!IsConfigured)
                return;

            switch (condition)
            {
                case ModuleCondition.Normal:
                    SetTextVisible(true);
                    break;
                case ModuleCondition.Damaged:
                    SetTextVisible(true);
                    if (isActiveAndEnabled)
                    {
                        _textFlickerCoroutine = StartCoroutine(FlickerText());
                        if (_sparkEmitters.Count > 0)
                            _sparkCoroutine = StartCoroutine(PlayIntermittentSparks());
                    }
                    break;
                case ModuleCondition.PoweredOff:
                    SetTextVisible(false);
                    break;
            }
        }

        private void StopRunningEffects()
        {
            if (_textFlickerCoroutine != null)
            {
                StopCoroutine(_textFlickerCoroutine);
                _textFlickerCoroutine = null;
            }

            if (_sparkCoroutine != null)
            {
                StopCoroutine(_sparkCoroutine);
                _sparkCoroutine = null;
            }

            foreach (var effect in _sparkEmitters)
            {
                if (effect == null) continue;
                effect.Stop();
                effect.gameObject.SetActive(false);
            }
        }

        private IEnumerator FlickerText()
        {
            while (_condition == ModuleCondition.Damaged)
            {
                SetTextVisible(Random.value > 0.4f);
                yield return new WaitForSeconds(Random.Range(
                    Mathf.Min(flickerMinInterval, flickerMaxInterval),
                    Mathf.Max(flickerMinInterval, flickerMaxInterval)));
            }
        }

        private IEnumerator PlayIntermittentSparks()
        {
            yield return new WaitForSeconds(Random.Range(0.05f, 0.25f));

            while (_condition == ModuleCondition.Damaged)
            {
                PlaySparkBurst();
                yield return new WaitForSeconds(Random.Range(
                    Mathf.Min(sparkMinInterval, sparkMaxInterval),
                    Mathf.Max(sparkMinInterval, sparkMaxInterval)));
            }
        }

        private void PlaySparkBurst()
        {
            if (_sparkEmitters.Count == 0) return;

            var effect = _sparkEmitters[Random.Range(0, _sparkEmitters.Count)];
            if (effect == null) return;

            effect.gameObject.SetActive(true);
            effect.Reinit();
            effect.Play();
        }

        private void SetTextVisible(bool visible)
        {
            if (moduleTextRenderer == null) return;

            moduleTextRenderer.color = _originalTextColor;
            moduleTextRenderer.enabled = visible;
        }

        private void CreateSparkEmitters()
        {
            if (sparkAsset == null || modulePicRenderer == null)
                return;

            var bounds = modulePicRenderer.bounds;
            var scaledExtents = new Vector2(
                bounds.extents.x * Mathf.Max(0.01f, sparkBoundsScale.x),
                bounds.extents.y * Mathf.Max(0.01f, sparkBoundsScale.y));
            var sizeBase = Mathf.Max(0.01f, Mathf.Min(bounds.size.x, bounds.size.y));

            foreach (var rawDirection in SparkDirections)
            {
                var direction = rawDirection.normalized;
                var worldPosition = (Vector2)bounds.center + sparkCenterOffset + new Vector2(
                    rawDirection.x * scaledExtents.x,
                    rawDirection.y * scaledExtents.y) + direction * sparkBoundsPadding;

                var emitterObject = new GameObject($"Damage Spark {rawDirection.x:0},{rawDirection.y:0}");
                emitterObject.transform.SetParent(transform, false);
                emitterObject.transform.localPosition = transform.InverseTransformPoint(worldPosition);

                var effect = emitterObject.AddComponent<VisualEffect>();
                effect.visualEffectAsset = sparkAsset;
                ConfigureSparkEffect(effect, direction, sizeBase);

                var renderer = emitterObject.GetComponent<Renderer>();
                if (renderer != null)
                {
                    renderer.sortingLayerID = modulePicRenderer.sortingLayerID;
                    renderer.sortingOrder = modulePicRenderer.sortingOrder - 1;
                }

                effect.Stop();
                emitterObject.SetActive(false);
                _sparkEmitters.Add(effect);
            }
        }

        private void ConfigureSparkEffect(VisualEffect effect, Vector2 direction, float sizeBase)
        {
            if (effect.HasFloat("Spawn Rate"))
                effect.SetFloat("Spawn Rate", 0f);
            if (effect.HasVector2("Burst Count Min/Max"))
                effect.SetVector2("Burst Count Min/Max", sparkBurstCount);
            if (effect.HasVector2("Lifetime Min/Max"))
                effect.SetVector2("Lifetime Min/Max", sparkLifetime);
            if (effect.HasVector2("Size Min/Max"))
                effect.SetVector2("Size Min/Max", sparkSizeFactor * sizeBase);
            if (effect.HasFloat("Sparkle Width"))
                effect.SetFloat("Sparkle Width", sparkWidth);
            if (effect.HasVector3("Initial Velocity_vector"))
            {
                var speed = sizeBase * sparkVelocityFactor;
                effect.SetVector3("Initial Velocity_vector", new Vector3(direction.x, direction.y, 0f) * speed);
            }
        }
    }
}