import * as KMap from "@/utils/ol-map/KMap";
import * as util from "@/common/ol_common.js";
import config from "@/api/config.js";
import Style from "ol/style/Style";
import Icon from "ol/style/Icon";
import { Fill, Stroke, Text } from "ol/style.js";
import { Point } from 'ol/geom';
import Feature from "ol/Feature";
import * as proj from "ol/proj";
import { getArea } from 'ol/sphere.js';
import WKT from "ol/format/WKT.js";
import proj4 from "proj4"
import { register } from "ol/proj/proj4";
proj4.defs("EPSG:38572", "+proj=merc +a=6378137 +b=6378137 +lat_ts=0 +lon_0=0 +x_0=0 +y_0=0 +k=1 +units=m +nadgrids=@null +wktext +no_defs +type=crs");
register(proj4);

/**
 * @description 地图层对象
 */
class DrawRegionMap {
    constructor() {
        let that = this;
        let vectorStyle = new KMap.VectorStyle();
        this.vectorStyle = vectorStyle;
        // 是否允许编辑（勾画页 true，小弹窗回显页 false）
        this.editable = true;

        // 位置图标
        this.clickPointLayer = new KMap.VectorLayer("clickPointLayer", 9999, {
            style: () => {
                return new Style({
                    image: new Icon({
                        src: require("@/assets/img/home/garden-point.png"),
                        scale: 0.5,
                        anchor: [0.5, 1],
                    }),
                });
            },
        });

        // 只读状态区域图层（展示多 polygon，用于“已解决 / 未解决”等状态）
        this.staticRegionLayer = new KMap.VectorLayer("staticRegionLayer", 9998, {
            style: (f) => {
                const status = f.get("status"); // 'resolved' | 'unresolved'
                const isResolved = status === "resolved";
                // 已解决：深灰填充，浅白描边；未解决：浅蓝填充，亮蓝描边
                const fillColor = isResolved ? "rgba(0, 0, 0, 0.6)" : "rgba(0, 0, 0, 0.5)";
                const strokeColor = isResolved ? "#7C7C7C" : "#2199F8";

                const text = new Text({
                    text: status === "resolved" ? "已解决" : "未解决",
                    font: "12px sans-serif",
                    fill: new Fill({ color: "#ffffff" }),
                    backgroundFill: new Fill({ 
                        color: isResolved ? "#949494" : "#2199F8" 
                    }),
                    padding: [1, 5, 1, 5],
                });
                const style =  new Style({
                        fill: new Fill({ color: fillColor }),
                        stroke: new Stroke({ color: strokeColor, width: 1 }),
                        text: text,
                    })

                const text2 = new Style({
                    text: new Text({
                        text: `发现时间:${f.get("updatedTime")}`,
                        font: "12px sans-serif",
                        offsetY: -24,
                        fill: new Fill({ color: "#ffffff" }),
                        backgroundFill: new Fill({ 
                            color: isResolved ? "rgba(171, 171, 171, 0.4)" : "rgba(33, 153, 248, 0.6)" 
                        }),
                        padding: [1, 5, 1, 5],
                    }),
                });

                return [style, text2];
            },
        });
    }

    /**
     * 初始化地图
     * @param {string} location WKT 点位
     * @param {HTMLElement|string} target 地图容器
     * @param {boolean} editable 是否允许绘制/编辑地块
     * @param {boolean} movable 是否允许拖动/缩放地图
     * @param {boolean} showPoint 是否显示初始点位图标
     */
    initMap(location, target, editable = true, movable = true, showPoint = true) {
        let level = 16;
        let coordinate = util.wktCastGeom(location).getFirstCoordinate();
        this.kmap = new KMap.Map(target, level, coordinate[0], coordinate[1], null, 8, 22);
        // 记录当前地图是否可编辑，供样式控制使用
        this.editable = editable;
        let xyz2 = config.base_img_url3 + "map/lby/{z}/{x}/{y}.png";
        this.kmap.addXYZLayer(xyz2, { minZoom: 8, maxZoom: 22 }, 2);
        this.kmap.addLayer(this.clickPointLayer.layer);
        this.kmap.addLayer(this.staticRegionLayer.layer);
        // 根据 showPoint 决定是否在初始化时落下点位图标
        if (showPoint) {
            this.setMapPoint(coordinate);
        } else {
            this.clickPointLayer.source.clear();
        }

        // 仅在 editable 为 true 时开启绘制/编辑能力（用于勾画页面）
        if (editable) {
            this.kmap.initDraw((e) => {
                // drawend事件：绘制结束后的处理（支持绘制多个地块）
            })
            this.kmap.startDraw()
            this.kmap.modifyDraw()
        }

        // movable 为 false 时，禁用地图拖动、缩放等交互（用于小弹窗只看不动）
        if (!movable && this.kmap && this.kmap.setStates) {
            this.kmap.setStates({
                DoubleClickZoom: false,
                DragAndDrop: false,
                MouseWheelZoom: false,
            });
        }
    }

    /**
     * 回显地块
     * @param {string[]} geometryArr 多边形 WKT 数组
     * @param {boolean} needFitView 是否自动缩放视图
     * @param {string|number} areaText 显示的面积（单位：亩），可选
     */
    setAreaGeometry(geometryArr, needFitView = false, areaText) {
        // 兜底保护：geometryArr 可能为 undefined/null 或空数组
        if (!Array.isArray(geometryArr) || geometryArr.length === 0) return;
        // 地图实例或图层尚未初始化时也直接返回，避免报错
        if (!this.kmap || !this.kmap.polygonLayer || !this.kmap.polygonLayer.source) return;

        let that = this;
        geometryArr.map(item => {
            // 不使用 setLayerWkt，而是手动添加要素，避免自动缩放视图
            const format = new WKT()
            const mapProjection = that.kmap.map.getView().getProjection()
            let geometry = format.readGeometry(item, {
                dataProjection: 'EPSG:4326',
                featureProjection: mapProjection
            })
            let f = new Feature({ geometry: geometry })
            // 只读模式下，为多边形单独设置样式：仅填充+边框 + 面积文本，不显示可拖动的顶点小圆点
            if (!this.editable) {
                const styles = [
                    new Style({
                        fill: new Fill({
                            color: "rgba(0, 0, 0, 0.5)",
                        }),
                        stroke: new Stroke({
                            color: "#2199F8",
                            width: 2,
                        }),
                    }),
                ];
                // 面积文本（如：24亩），优先使用传入的 areaText
                const textValue = areaText != null && areaText !== ""
                    ? `${areaText}亩`
                    : "";
                if (textValue) {
                    styles.push(
                        new Style({
                            text: new Text({
                                text: textValue,
                                font: "15px sans-serif",
                                fill: new Fill({ color: "#ffffff" }),
                            }),
                        })
                    );
                }
                f.setStyle(styles);
            }
            that.kmap.polygonLayer.source.addFeature(f)
        })
        // 根据参数决定是否需要自适应地块范围
        if (needFitView) {
            this.fitView()
        }
    }


    fitView() {
        let extent = this.kmap.polygonLayer.source.getExtent()
        // 地图自适应到区域可视范围
        this.kmap.getView().fit(extent, { duration: 500, padding: [100, 100, 100, 100] });
    }

    clearLayer() {
        // this.kmap.removeLayer(this.clickPointLayer.layer)
        if (this.kmap && this.kmap.polygonLayer) {
            this.kmap.polygonLayer.source.clear();
        }
        if (this.staticRegionLayer && this.staticRegionLayer.source) {
            this.staticRegionLayer.source.clear();
        }
    }

    /**
     * 销毁地图实例（用于从编辑态切换到仅查看时重新初始化）
     */
    destroyMap() {
        this.clearLayer();
        if (this.kmap && typeof this.kmap.destroy === "function") {
            this.kmap.destroy();
        }
        this.kmap = null;
    }

    getAreaGeometry() {
        const features = this.kmap.getLayerFeatures()
        let geometryArr = []
        let area = 0
        const format = new WKT()
        // 获取图层上的Polygon，转成WKT用于回显
        features.forEach(item => {
            // 使用 writeGeometry 而不是 writeFeature，因为 setLayerWkt 期望的是几何体的 WKT
            const geometry = item.getGeometry()
            geometryArr.push(format.writeGeometry(geometry, {
                dataProjection: 'EPSG:4326',
                featureProjection: this.kmap.map.getView().getProjection()
            }))
            let geom = geometry.clone()
            geom.transform(proj.get("EPSG:4326"), proj.get("EPSG:38572"))
            let areaItem = getArea(geom)
            areaItem = (areaItem + areaItem / 2) / 1000;
            area += areaItem
        })
        return { geometryArr, mianji: area.toFixed(2) }  // 修改为 mianji 字段，与创建页面保持一致
    }

    setMapPosition(center) {
        this.kmap.getView().animate({
            center,
            zoom: 17,
            duration: 500,
        });
        this.setMapPoint(center)
    }

    setMapPoint(coordinate) {
        this.clickPointLayer.source.clear()
        let point = new Feature(new Point(coordinate))
        this.clickPointLayer.addFeature(point)
    }

    // 删除当前地块（删除最新绘制的一个地块）
    deleteCurrentPolygon() {
        if (!this.kmap || !this.kmap.polygonLayer) return;
        const features = this.kmap.polygonLayer.source.getFeatures();
        if (features && features.length > 0) {
            const lastFeature = features[features.length - 1];
            this.kmap.polygonLayer.source.removeFeature(lastFeature);
        }
    }

    /**
     * 设置只读状态区域图层（多个 polygon，不可编辑）
     * @param {Array<{ geometry: string, status?: 'resolved' | 'unresolved' }>} regions
     *
     * 使用示例：
     * drawRegionMap.setStatusRegions([
     *   { geometry: 'MULTIPOLYGON(((...)))', status: 'resolved' },
     *   { geometry: 'MULTIPOLYGON(((...)))', status: 'unresolved' },
     * ]);
     */
    setStatusRegions(regions) {
        if (!this.kmap || !this.staticRegionLayer || !this.staticRegionLayer.source) return;

        // 仅操作只读图层，不影响当前地图的绘制 / 编辑状态
        this.staticRegionLayer.source.clear();
        if (!Array.isArray(regions) || regions.length === 0) return;

        const format = new WKT();
        const mapProjection = this.kmap.map.getView().getProjection();

        regions.forEach((region) => {
            if (!region || !region.geometry) return;
            try {
                const geometry = format.readGeometry(region.geometry, {
                    dataProjection: "EPSG:4326",
                    featureProjection: mapProjection,
                });
                const feature = new Feature({ geometry });
                feature.set("status", region.status || "unresolved");
                feature.set("updatedTime", region.updatedTime);
                this.staticRegionLayer.addFeature(feature);
            } catch (e) {
                // 单个区域解析失败时忽略
            }
        });

        // 不在这里直接缩放，避免只按某一层适配视图；
        // 由调用方在需要时统一调用 fitAllRegions 进行视图自适应
    }

    /**
     * 视图自适应到「只读区域图层 + 可编辑多边形图层」的联合范围
     * 适用于同时存在接口返回区域和本地勾画区域时，保证都能出现在视野内
     */
    fitAllRegions() {
        if (!this.kmap) return;

        const extents = [];

        // 只读状态区域图层范围
        if (this.staticRegionLayer && this.staticRegionLayer.source) {
            const features = this.staticRegionLayer.source.getFeatures();
            if (features && features.length > 0) {
                extents.push(this.staticRegionLayer.source.getExtent());
            }
        }

        // 可编辑 polygon 图层范围
        if (this.kmap.polygonLayer && this.kmap.polygonLayer.source) {
            const features = this.kmap.polygonLayer.source.getFeatures();
            if (features && features.length > 0) {
                extents.push(this.kmap.polygonLayer.source.getExtent());
            }
        }

        if (extents.length === 0) return;

        // 计算所有范围的并集 [minX, minY, maxX, maxY]
        const merged = extents.reduce(
            (acc, cur) => {
                if (!acc) return cur.slice();
                return [
                    Math.min(acc[0], cur[0]),
                    Math.min(acc[1], cur[1]),
                    Math.max(acc[2], cur[2]),
                    Math.max(acc[3], cur[3]),
                ];
            },
            null
        );

        if (merged) {
            this.kmap.getView().fit(merged, { duration: 500, padding: [100, 100, 100, 100] });
        }
    }
}

export default DrawRegionMap;