using UnityEngine;

public class TextureChanger : CombineTileByCPU
{
    public Shader cutoutShader; // 材质拼图着色器

    private JsonConfigParser.TileConfig config; // 配置信息

    private bool isDisabled = true; // 是否禁用点击更换贴图

    private Vector3 mouseDownPosition; // 记录鼠标按下的位置
    private const float dragThreshold = 5f; // 拖拽的阈值（像素）

    /// <summary>
    /// 获取当前配置
    /// </summary>
    /// <returns></returns>
    public override JsonConfigParser.TileConfig GetConfig()
    {
        return config;
    }

    /// <summary>
    /// 设置当前配置
    /// </summary>
    /// <param name="jsonContent"></param>
    public override void SetTileConfig(string jsonContent)
    {
        config = ConfigManager.getTestTileConfig(jsonContent);
    }

    /// <summary>
    /// 获取当前共享材质
    /// </summary>
    /// <returns></returns>
    public override Material GetCurrentMaterial()
    {
        // 返回当前对象的材质
        return GetComponent<Renderer>().sharedMaterial;
    }

    /// <summary>
    /// 获取当前材质拼图着色器
    /// </summary>
    /// <returns></returns>
    public override Shader GetCurrentShader()
    {
        return cutoutShader;
    }

    /// <summary>
    /// 设置当前贴图
    /// </summary>
    /// <param name="jsonStr"></param>
    public void SetCurrentTexture(string jsonStr)
    {
        UpdateMaterial(jsonStr);
    }

    /// <summary>
    /// 鼠标按下事件处理
    /// </summary>
    private void OnMouseDown()
    {
        // 记录鼠标按下的位置
        mouseDownPosition = Input.mousePosition;
    }

    /// <summary>
    /// 鼠标抬起事件处理
    /// </summary>
    private void OnMouseUp()
    {
        // 检查是否是点击而非拖拽
        if (Vector3.Distance(mouseDownPosition, Input.mousePosition) > dragThreshold)
        {
            return; // 如果拖拽距离超过阈值，则不触发点击事件
        }

        // 执行点击检测逻辑
        HandleClick();
    }

    /// <summary>
    /// 处理点击事件
    /// </summary>
    private void HandleClick()
    {
        if (isDisabled)
        {
            return;
        }
        string jsonStr = ConfigCache.Instance.GetConfig(gameObject.tag);
        if (!string.IsNullOrEmpty(jsonStr))
        {
            SetCurrentTexture(jsonStr);
        }
    }

    /// <summary>
    /// 禁用点击更换贴图
    /// </summary>
    public void EnableTextureChanger()
    {
        isDisabled = false;
    }

    /// <summary>
    /// 启用点击更换贴图
    /// </summary>
    public void DisableTextureChanger()
    {
        isDisabled = true;
    }
}