import React, { useState, useEffect, useCallback } from "react";
import { useData, useMap } from "../MapComponent";
import { Checkbox, FormControlLabel } from "@mui/material";
import WebGLVectorTileLayer from "ol/layer/WebGLVectorTile";
import VectorLayer from "ol/layer/Vector";
import VectorTileLayer from "ol/layer/VectorTile";
import { DeckLayer } from "@utils/layers";

// 定义统一的图层项接口
interface LayerItem {
  id: string;
  name: string;
  visible: boolean;
  type: "ol" | "deck";
  layerRef: any; // OpenLayers Layer 实例或 deck.gl layer 对象
}

const LayerControl: React.FC = () => {
  const map = useMap();
  const data = useData();
  if (!data) return;
  const {
    deckLayer,
    isContourLayerAvailable,
    isWaterflowLayerAvailable,
    setShowWaterflowLayer,
    setShowContourLayer,
  } = data;
  const [layerItems, setLayerItems] = useState<LayerItem[]>([]);

  // 更新图层列表
  const updateLayers = useCallback(() => {
    if (!map || !data) return;
    const { deckLayer } = data;

    const items: LayerItem[] = [];

    // 1. 获取 OpenLayers 图层
    const mapLayers = map.getLayers().getArray();
    mapLayers.forEach((layer) => {
      // 筛选特定类型的 OpenLayers 图层
      if (
        layer instanceof WebGLVectorTileLayer ||
        layer instanceof VectorTileLayer ||
        layer instanceof VectorLayer
      ) {
        const value = layer.get("value");
        const name = layer.get("name");
        // 只有设置了 value (作为 ID) 的图层才会被纳入控制
        if (value) {
          items.push({
            id: value,
            name: name || value,
            visible: layer.getVisible(),
            type: "ol",
            layerRef: layer,
          });
        }
      }
    });

    // 2. 获取 DeckLayer 中的子图层
    if (deckLayer && deckLayer instanceof DeckLayer) {
      const deckLayers = deckLayer.getDeckLayers();
      deckLayers.forEach((layer: any) => {
        if (layer && layer.id) {
          // 仅处理 junctionContourLayer 和 waterflowLayer
          if (
            layer.id !== "junctionContourLayer" &&
            layer.id !== "waterflowLayer"
          ) {
            return;
          }
          // 检查可用性
          if (
            (layer.id === "junctionContourLayer" && !isContourLayerAvailable) ||
            (layer.id === "waterflowLayer" && !isWaterflowLayerAvailable)
          ) {
            return; // 跳过不可用图层
          }
          const visible =
            deckLayer.getDeckLayerVisible(layer.id) ??
            layer.props?.visible ??
            true;
          items.push({
            id: layer.props.id,
            name: layer.props.name, // 使用 name 属性作为显示名称
            visible: visible,
            type: "deck",
            layerRef: layer,
          });
        }
      });
    }

    // 3. 定义图层显示顺序和过滤白名单
    const layerOrder = [
      "junctions",
      "reservoirs",
      "tanks",
      "pipes",
      "pumps",
      "valves",
      "scada",
      "waterflowLayer",
      "junctionContourLayer",
    ];

    // 过滤并排序
    const sortedItems = items
      .filter((item) => layerOrder.includes(item.id))
      .sort((a, b) => {
        const indexA = layerOrder.indexOf(a.id);
        const indexB = layerOrder.indexOf(b.id);
        return indexA - indexB;
      });

    setLayerItems(sortedItems);
  }, [map, isWaterflowLayerAvailable, isContourLayerAvailable]);

  useEffect(() => {
    updateLayers();

    if (map) {
      const layerCollection = map.getLayers();
      layerCollection.on("change:length", updateLayers);
    }

    return () => {
      if (map) {
        map.getLayers().un("change:length", updateLayers);
      }
    };
  }, [map, updateLayers]);

  const handleVisibilityChange = (item: LayerItem, checked: boolean) => {
    if (item.type === "ol") {
      item.layerRef.setVisible(checked);
    } else if (item.type === "deck" && deckLayer) {
      if (item.id === "junctionContourLayer") {
        setShowContourLayer && setShowContourLayer(checked);
      }
      if (item.id === "waterflowLayer") {
        setShowWaterflowLayer && setShowWaterflowLayer(checked);
      }
    }

    setLayerItems((prev) =>
      prev.map((i) => (i.id === item.id ? { ...i, visible: checked } : i))
    );
  };

  if (!data) {
    return <div>Loading...</div>;
  }

  return (
    <div className="absolute left-4 bottom-4 bg-white rounded-md drop-shadow-lg z-1300 opacity-85 hover:opacity-100 transition-opacity max-w-xs">
      <div className="ml-3 grid grid-cols-3">
        {layerItems.map((item) => (
          <FormControlLabel
            key={item.id}
            control={
              <Checkbox
                checked={item.visible}
                onChange={(e) => handleVisibilityChange(item, e.target.checked)}
                size="small"
              />
            }
            label={item.name}
            sx={{
              fontSize: "0.7rem",
              "& .MuiFormControlLabel-label": { fontSize: "0.7rem" },
            }}
          />
        ))}
      </div>
    </div>
  );
};

export default LayerControl;