package simulation_service

import (
	"archive/zip"
	"context"
	"fmt"
	"github.com/cloudwego/hertz/pkg/app"
	"io"
	"net/http"
	"os"
	"path/filepath"
	"pji_desktop_http/biz/dal/mysql"
	"pji_desktop_http/common/config"
	"pji_desktop_http/common/config/c_log"
	"pji_desktop_http/common/util"
)

// DownloadSimulationZipFile 根据请求id从oss拉取并打包仿真测试所需要的文件
// @router /simulation/download/zipfile   [GET]
func DownloadSimulationZipFile(ctx context.Context, c *app.RequestContext) {
	id := c.Query("id")
	fmt.Println(id)

	// 根据id生成用于地图更新的压缩包
	filePath, tmpDir, err := generateSimulationZipById(ctx, id)
	if err != nil {
		c.JSON(http.StatusInternalServerError, map[string]string{"error": err.Error()})
	}
	fmt.Println("filePath", filePath)

	// 检查文件是否存在
	if _, err := os.Stat(filePath); os.IsNotExist(err) {
		c.JSON(http.StatusNotFound, map[string]string{"error": "File not found"})
		return
	}

	// 打开文件
	f, err := os.Open(filePath)
	if err != nil {
		c.JSON(http.StatusInternalServerError, map[string]string{"error": "Failed to open file"})
		return
	}
	defer f.Close()

	// 设置响应头
	c.Response.Header.Set("Content-Disposition", fmt.Sprintf(`attachment; filename="%s"`, filepath.Base(filePath)))
	c.Response.Header.Set("Content-Type", "binary/octet-stream")

	// 将文件流式传输回客户端
	data, err := io.ReadAll(f)
	if err != nil {
		panic(err)
	}
	if _, err := c.Write(data); err != nil {
		c.JSON(http.StatusInternalServerError, map[string]string{"error": err.Error()})
		return
	}
	defer os.RemoveAll(tmpDir)
}

// 根据id生成用于仿真测试的压缩包
func generateSimulationZipById(ctx context.Context, id string) (file string, tmpDir string, err error) {
	// 根据id获取对应的oss文件列表
	allFileList, err := util.GetExactedMapFileById(id)

	//fmt.Println("Filtered Strings:", fileList)
	if err != nil {
		return
	}

	// 创建临时文件夹
	tmpDir, err = os.MkdirTemp("", "temp-download-*")

	fmt.Println("tmpDir:", tmpDir)
	if err != nil {
		fmt.Println("Error creating temporary directory:", err)
		return "", "", err
	}
	c_log.GlobalLogger.Info("创建下载-临时文件夹：", tmpDir)

	// 创建根文件夹（文件打包的根目录）
	baseDir := filepath.Join(tmpDir, "data")
	if err := os.Mkdir(baseDir, 0755); err != nil {
		fmt.Println("Error creating subdirectory:", err)
		return "", "", err
	}
	c_log.GlobalLogger.Info("创建文件打包根目录：", baseDir)

	// 从oss下载data.zip文件到根目录（data.zip中的mapBuf文件夹包含map.pgm, map.yaml）
	// 过滤特定后缀的文件列表
	simulationFileList := util.FilterBySuffixes(allFileList, config.SimulationFiltersuffixes...)
	// 从oss下载文件到 根目录
	for _, file := range simulationFileList {
		err = config.OssBucket.GetObjectToFile(file, filepath.Join(baseDir, filepath.Base(file)))
		if err != nil {
			fmt.Println("Error downloading mapBuf file:", err)
			return "", "", err
		}
	}
	c_log.GlobalLogger.Info("下载data.zip文件到根目录 - 成功")

	// 下载world文件
	// 查询状态
	world, err := mysql.QueryWorld(ctx, id)
	if err != nil || world == nil { // 文件不存在
		c_log.GlobalLogger.Info("world文件不存在 - 跳过")
	} else { // 文件存在
		// 下载文件
		worldURL := world.WorldURL
		err = config.OssBucket.GetObjectToFile(worldURL, filepath.Join(baseDir, filepath.Base(worldURL)))
		if err != nil {
			fmt.Println("Error downloading world file:", err)
			return "", "", err
		}
		c_log.GlobalLogger.Info("下载world文件到根目录 - 成功")
	}

	// 创建压缩文件
	zipPath := filepath.Join(tmpDir, "simulationFile-"+id+".zip")
	zipFile, err := os.Create(zipPath)
	if err != nil {
		fmt.Println("Error creating ZIP file:", err)
		return "", "", err
	}
	defer zipFile.Close()

	zipWriter := zip.NewWriter(zipFile)
	defer zipWriter.Close()

	// 压缩文件夹
	if err := util.AddDirToZip(baseDir, zipWriter); err != nil {
		fmt.Println("Error adding directory to ZIP:", err)
		return "", "", err
	}
	fmt.Println("ZIP file created successfully.")

	c_log.GlobalLogger.Info("创建压缩文件 - 成功")

	return zipPath, tmpDir, nil
}