using UnityEngine;
using UnityEngine.UI;

/// <summary>
/// 棋盘格子控件（一个交叉点）：
/// 支持两种接入方式：
/// 1. 预制体（拖到 UIChessBoard.prefab_Cell）：根节点挂本脚本 + Image + Button，
///    Image 可作点击热区（透明）或格子底图（保留原样显示）
/// 2. 不拖预制体：由 UIChessBoard 代码生成（透明热区）
/// 走子提示（Hint 子物体）没有会自动创建，不拦截射线
/// </summary>
public class UIChessCell : MonoBehaviour
{
    /// <summary>逻辑坐标（x 0~8，y 0~9，红方在下方；黑方视角棋盘会整体翻转）</summary>
    public Vector2Int gridPos;

    /// <summary>点击热区/格子底图（预制体上拖；为空自动 GetComponent）</summary>
    public Image img_Click;

    /// <summary>走子提示（预制体上拖；为空自动找/建名为 Hint 的子物体）</summary>
    public Image img_Hint;

    private Button btn_Click;
    private UIChessBoard ownerBoard;

    private Sprite sprite_Dot;
    private Sprite sprite_Ring;
    private float dotSize;
    private float ringSize;

    /// <summary>由 UIChessBoard 生成时调用（cellSize = 网格间距）</summary>
    public void Init(UIChessBoard board, Vector2Int pos, float cellSize)
    {
        ownerBoard = board;
        gridPos = pos;

        // ---- 点击热区 ----
        if (img_Click == null) img_Click = GetComponent<Image>();
        if (img_Click == null)
        {
            img_Click = gameObject.AddComponent<Image>();
            img_Click.color = new Color(1f, 1f, 1f, 0f); // 代码补的热区为全透明（预制体自带底图则保留原样）
        }
        img_Click.raycastTarget = true;

        // ---- 走子提示 ----
        if (img_Hint == null)
        {
            var t = transform.Find("Hint");
            if (t != null) img_Hint = t.GetComponent<Image>();
            if (img_Hint == null) CreateHint();
        }
        if (img_Hint != null)
        {
            img_Hint.raycastTarget = false;
            img_Hint.gameObject.SetActive(false);
        }

        // 落子路径点固定用代码绘制的圆点/圆圈（颜色已烘焙）
        sprite_Dot = ChessArtFactory.GetHintDotSprite();
        sprite_Ring = ChessArtFactory.GetCaptureRingSprite();
        dotSize = cellSize * 0.45f;
        ringSize = cellSize * 1.12f;

        // ---- 按钮 ----
        btn_Click = GetComponent<Button>();
        if (btn_Click == null)
        {
            btn_Click = gameObject.AddComponent<Button>();
            btn_Click.transition = Selectable.Transition.None;
        }
        btn_Click.onClick.AddListener(() => ownerBoard.OnCellClicked(this));
    }

    /// <summary>显示走子提示：isCapture=false 走子点 / true 吃子圈（自定义图不染色）</summary>
    public void ShowHint(bool isCapture)
    {
        if (img_Hint == null) return;
        img_Hint.gameObject.SetActive(true);
        img_Hint.sprite = isCapture ? sprite_Ring : sprite_Dot;
        img_Hint.color = Color.white; // 默认图的绿/红已烘焙在图里；自定义图保持原色
        img_Hint.rectTransform.sizeDelta = isCapture
            ? new Vector2(ringSize, ringSize)
            : new Vector2(dotSize, dotSize);
    }

    public void HideHint()
    {
        if (img_Hint != null) img_Hint.gameObject.SetActive(false);
    }

    private void CreateHint()
    {
        var hgo = new GameObject("Hint", typeof(RectTransform), typeof(Image));
        var hrt = (RectTransform)hgo.transform;
        hrt.SetParent(transform, false);
        hrt.anchorMin = hrt.anchorMax = new Vector2(0.5f, 0.5f);
        hrt.anchoredPosition = Vector2.zero;
        img_Hint = hgo.GetComponent<Image>();
    }
}