package com.yj.earth.business.controller;

import com.baomidou.mybatisplus.core.conditions.query.LambdaQueryWrapper;
import com.baomidou.mybatisplus.core.conditions.query.QueryWrapper;
import com.graphhopper.GHRequest;
import com.graphhopper.GHResponse;
import com.graphhopper.GraphHopper;
import com.graphhopper.ResponsePath;
import com.graphhopper.config.Profile;
import com.graphhopper.util.shapes.GHPoint;
import com.yj.earth.annotation.CheckAuth;
import com.yj.earth.business.domain.FileInfo;
import com.yj.earth.business.domain.WebSource;
import com.yj.earth.business.service.FileInfoService;
import com.yj.earth.business.service.WebSourceService;
import com.yj.earth.common.config.GraphHopperProperties;
import com.yj.earth.common.util.ApiResponse;
import com.yj.earth.model.Point;
import com.yj.earth.model.RouteRequest;
import com.yj.earth.model.RouteResponse;
import io.swagger.v3.oas.annotations.Operation;
import io.swagger.v3.oas.annotations.Parameter;
import io.swagger.v3.oas.annotations.tags.Tag;
import lombok.Data;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.web.bind.annotation.*;

import javax.annotation.PostConstruct;
import javax.annotation.Resource;
import java.io.File;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;
import java.util.concurrent.atomic.AtomicBoolean;


@Data
@Slf4j
@Tag(name = "路径规划管理")

@RestController
@RequestMapping("/graphhopper")
public class GraphHopperController {
    @Resource
    private WebSourceService webSourceService;
    @Resource
    private FileInfoService fileInfoService;
    @Resource
    private GraphHopperProperties graphHopperProperties;

    // 存储当前可用的 GraphHopper 实例
    private volatile GraphHopper currentHopper;

    // 状态控制: 线程安全
    private final AtomicBoolean isLoading = new AtomicBoolean(false);
    private final AtomicBoolean isLoaded = new AtomicBoolean(false);

    @Operation(summary = "加载地图数据")
    @PostMapping("/loadMap")

    public ApiResponse loadMap(@Parameter(description = "文件路径") @RequestParam String path) {
        File osmFile = new File(path);
        if (!osmFile.exists()) {
            return ApiResponse.failure("地图文件不存在: " + path);
        }
        if (!osmFile.isFile() || !osmFile.getName().endsWith(".pbf")) {
            return ApiResponse.failure("仅支持有效的.pbf格式OSM文件");
        }
        // 防止并发加载
        if (isLoading.get()) {
            return ApiResponse.failure("地图正在加载中、请稍后查询状态");
        }

        // 标记加载状态
        isLoading.set(true);
        isLoaded.set(false);

        // 异步执行: 删除旧数据 → 创建新实例 → 加载新地图
        new Thread(() -> {
            GraphHopper newHopper = null;
            try {
                // 关键步骤1: 彻底删除旧地图数据目录
                deleteOldGraphDir();
                // 关键步骤2: 创建全新的GraphHopper实例
                newHopper = createNewGraphHopperInstance(path);
                // 关键步骤3: 加载新地图
                newHopper.importOrLoad();
                // 关键步骤4: 加载成功 → 替换当前实例 + 更新状态
                currentHopper = newHopper;
                isLoaded.set(true);
                log.info("地图加载成功");
            } catch (Exception e) {
                // 加载失败 → 清理新实例资源
                if (newHopper != null) {
                    newHopper.close();
                }
                isLoaded.set(false);
                e.printStackTrace();
                log.error("地图加载失败: " + e.getMessage());
            } finally {
                // 无论成功/失败、释放加载锁
                isLoading.set(false);
            }
        }).start();
        return ApiResponse.success(null);
    }

    @Operation(summary = "清除地图服务")
    @PostMapping("/clearMap")

    public ApiResponse clearMap() {
        // 防止并发操作（与加载操作互斥）
        if (isLoading.get()) {
            return ApiResponse.failure("地图正在加载中、无法清除、请稍后再试");
        }

        // 标记正在处理清除操作
        isLoading.set(true);
        try {
            // 1. 关闭当前GraphHopper实例
            if (currentHopper != null) {
                log.info("开始关闭当前地图服务实例");
                currentHopper.close();
                currentHopper = null;
                log.info("地图服务实例已关闭");
            }

            // 2. 删除地图数据目录
            log.info("开始删除地图数据目录");
            deleteOldGraphDir();
            log.info("地图数据目录已删除");

            // 3. 重置状态变量
            isLoaded.set(false);

            return ApiResponse.success("地图服务已成功清除");
        } catch (Exception e) {
            log.error("清除地图服务失败", e);
            return ApiResponse.failure("清除地图服务失败: " + e.getMessage());
        } finally {
            // 释放操作锁
            isLoading.set(false);
        }
    }

    @Operation(summary = "路径规划")
    @PostMapping("/route")

    public ApiResponse calculateRoute(@RequestBody RouteRequest request) {
        // 区分未加载地图和加载中两种状态
        if (isLoading.get()) {
            return ApiResponse.failure("地图正在加载中，请稍后再试");
        }
        if (!isLoaded.get() || currentHopper == null) {
            return ApiResponse.failure("地图未加载，请先加载地图");
        }
        try {
            // 构建路径点列表
            List<GHPoint> ghPoints = new ArrayList<>();
            ghPoints.add(new GHPoint(request.getStartLat(), request.getStartLng())); // 起点
            // 添加途经点
            if (request.getWaypoints() != null && !request.getWaypoints().isEmpty()) {
                for (Point waypoint : request.getWaypoints()) {
                    ghPoints.add(new GHPoint(waypoint.getLat(), waypoint.getLng()));
                }
            }
            ghPoints.add(new GHPoint(request.getEndLat(), request.getEndLng())); // 终点

            // 构建请求
            String targetProfile = request.getProfile() != null ? request.getProfile() : "car";
            GHRequest ghRequest = new GHRequest(ghPoints)
                    .setProfile(targetProfile);

            // 用新实例计算路径
            GHResponse response = currentHopper.route(ghRequest);
            // 处理错误
            if (response.hasErrors()) {
                // 检查是否有超出范围的错误
                boolean hasOutOfBoundsError = response.getErrors().stream()
                        .anyMatch(e -> e instanceof com.graphhopper.util.exceptions.PointOutOfBoundsException);
                boolean hasPointNotFoundError = response.getErrors().stream()
                        .anyMatch(e -> e instanceof com.graphhopper.util.exceptions.PointNotFoundException);
                if (hasOutOfBoundsError) {
                    return ApiResponse.failure("路径超出地图范围");
                } else if (hasPointNotFoundError) {
                    return ApiResponse.failure("未超地图范围但找不到路径点");
                } else {
                    return ApiResponse.failure("路径计算异常: " + response.getErrors().get(0).getMessage());
                }
            }
            // 解析结果
            ResponsePath bestPath = response.getBest();
            List<Point> pathPoints = new ArrayList<>();
            bestPath.getPoints().forEach(ghPoint ->
                    pathPoints.add(new Point(ghPoint.getLat(), ghPoint.getLon()))
            );
            // 封装返回
            RouteResponse routeResponse = new RouteResponse(bestPath.getDistance() / 1000, (double) (bestPath.getTime() / 60000), pathPoints);
            return ApiResponse.success(routeResponse);
        } catch (com.graphhopper.util.exceptions.PointOutOfBoundsException e) {
            // 捕获单点超出范围的异常
            return ApiResponse.failure("路径超出地图范围");
        } catch (Exception e) {
            return ApiResponse.failure("路径计算异常: " + e.getMessage());
        }
    }

    @Operation(summary = "获取地图加载状态")
    @GetMapping("/status")
    public ApiResponse getMapStatus() {
        if (isLoading.get()) {
            return ApiResponse.success("地图正在加载中");
        } else if (isLoaded.get() && currentHopper != null) {
            return ApiResponse.success("地图已加载完成");
        } else {
            return ApiResponse.success("地图未加载");
        }
    }

    @Operation(summary = "获取交通方式")

    @PostMapping("/profiles")
    public ApiResponse profiles() {
        return ApiResponse.success(graphHopperProperties.getProfiles());
    }

    /**
     * 创建全新的 GraphHopper 实例
     */
    private GraphHopper createNewGraphHopperInstance(String osmFilePath) {
        GraphHopper hopper = new GraphHopper();
        // 配置基础参数
        hopper.setOSMFile(osmFilePath);
        hopper.setGraphHopperLocation(graphHopperProperties.getGraphLocation());
        // 配置交通方式 + 权重策略
        List<Profile> profileList = new ArrayList<>();
        for (String profileName : graphHopperProperties.getProfiles()) {
            Profile profile = new Profile(profileName);
            profile.setVehicle(profileName);
            profile.setWeighting("fastest");
            profileList.add(profile);
        }
        hopper.setProfiles(profileList);

        return hopper;
    }

    /**
     * 递归删除旧地图数据目录
     */
    private void deleteOldGraphDir() {
        File graphDir = new File(graphHopperProperties.getGraphLocation());
        if (!graphDir.exists()) {
            log.info("旧地图目录不存在、无需删除: " + graphHopperProperties.getGraphLocation());
            return;
        }

        // 递归删除所有文件和子目录
        File[] files = graphDir.listFiles();
        if (files != null) {
            for (File file : files) {
                if (file.isDirectory()) {
                    deleteOldGraphDir(file);
                } else {
                    boolean deleted = file.delete();
                    log.info("删除旧地图文件: " + file.getAbsolutePath() + " → " + (deleted ? "成功" : "失败"));
                }
            }
        }

        // 删除空目录
        boolean dirDeleted = graphDir.delete();
        System.out.println("删除旧地图目录: " + graphDir.getAbsolutePath() + " → " + (dirDeleted ? "成功" : "失败"));
    }

    // 重载:递归删除子目录
    private void deleteOldGraphDir(File subDir) {
        File[] files = subDir.listFiles();
        if (files != null) {
            for (File file : files) {
                if (file.isDirectory()) {
                    deleteOldGraphDir(file);
                } else {
                    file.delete();
                }
            }
        }
        subDir.delete();
    }
}