using System.Collections.Generic;
using UnityEngine;
#if UNITY_EDITOR
using UnityEditor;
#endif

namespace AibisDream.UI
{
    [RequireComponent(typeof(SpriteProgressBar))]
    public class SignLightHandler : MonoBehaviour
    {
        [Header("颜色设置")]
        [SerializeField] private Color lessColor;
        [SerializeField] private Color nearColor;
        [SerializeField] private Color moreColor;


        [Header("引用")]
        [SerializeField] private SpriteProgressBar progressBar;
        [SerializeField] private SpriteRenderer signLight;
        
        private void OnEnable()
        {
            if (progressBar != null)
            {
                // 订阅进度条的值变化事件
                progressBar.OnValueChanged.AddListener(OnProgressBarValueChanged);
            }
        }
        
        private void OnDisable()
        {
            if (progressBar != null)
            {
                // 取消订阅
                progressBar.OnValueChanged.RemoveListener(OnProgressBarValueChanged);
            }
        }
        
        private void OnProgressBarValueChanged(int currentValue)
        {
            if (progressBar == null)
                return;

            // 获取 SpriteRenderer 列表并更新颜色
            var renderers = progressBar.SpriteRenderers;
            var maxValue = progressBar.MaxValue;
            UpdateColors(currentValue, maxValue, renderers);

            // 更新信号灯
            UpdateSignLight(currentValue, maxValue);
        }

        /// <summary>
        /// 更新颜色逻辑
        /// 根据 currentValue 和 maxValue 更新 renderers 列表中每个 SpriteRenderer 的颜色
        /// </summary>
        /// <param name="currentValue">当前值</param>
        /// <param name="maxValue">最大值</param>
        /// <param name="renderers">SpriteRenderer 列表</param>
        private void UpdateColors(int currentValue, int maxValue, IReadOnlyList<SpriteRenderer> renderers)
        {
            Color targetColor;
            // 如果当前值小于最大值的5%，则设置为lessColor
            if (currentValue < maxValue * 0.95f)
            {
                targetColor = lessColor;
            }
            // 如果当前值大于最大值，则设置为moreColor
            else if (currentValue >= maxValue)
            {
                targetColor = moreColor;
            }
            // 如果当前值大于最大值的5%，则设置为nearColor
            else
            {
                targetColor = nearColor;
            }

            foreach (var renderer in renderers)
            {
                renderer.color = targetColor;
            }
        }
        
        private void UpdateSignLight(int currentValue, int maxValue)
        {
            Color targetColor;
            // 如果当前值小于最大值的5%，则设置为lessColor
            if (currentValue < maxValue * 0.95f)
            {
                targetColor = lessColor;
            }
            // 如果当前值大于最大值，则设置为moreColor
            else if (currentValue >= maxValue)
            {
                targetColor = moreColor;
            }
            // 如果当前值大于最大值的5%，则设置为nearColor
            else
            {
                targetColor = nearColor;
            }

            signLight.color = targetColor;
        }
        
#if UNITY_EDITOR
        private void OnValidate()
        {
            // 如果进度条引用为空，尝试自动查找
            if (progressBar == null)
            {
                progressBar = GetComponent<SpriteProgressBar>();
                if (progressBar == null)
                {
                    progressBar = GetComponentInParent<SpriteProgressBar>();
                }
            }
            
            // 在编辑器中预览颜色变化
            if (!Application.isPlaying && progressBar != null)
            {
                // 延迟执行，避免在序列化过程中出现问题
                EditorApplication.delayCall += OnEditorPreview;
            }
        }
        
        private void OnEditorPreview()
        {
            if (this == null || gameObject == null)
                return;
            
            EditorApplication.delayCall -= OnEditorPreview;
            
            if (!Application.isPlaying && progressBar != null)
            {
                var renderers = progressBar.SpriteRenderers;
                if (renderers != null && renderers.Count > 0)
                {
                    UpdateColors(progressBar.CurrentValue, progressBar.MaxValue, renderers);
                }
            }
        }
#endif
    }
}