package map_service

import (
	"archive/zip"
	"context"
	"encoding/json"
	"fmt"
	"github.com/cloudwego/hertz/pkg/app"
	"github.com/cloudwego/hertz/pkg/protocol/consts"
	"io"
	"io/ioutil"
	"net/http"
	"os"
	"path/filepath"
	"pji_desktop_http/common/config"
	"pji_desktop_http/common/entity"
	"pji_desktop_http/common/util"
)

// CheckMapBufConsistency 检查请求id对应的mapBuf文件夹的一致性
// @router /map/checkmapbuf [POST]
func CheckMapBufConsistency(ctx context.Context, c *app.RequestContext) {
	var err error
	var req []string
	err = c.BindAndValidate(&req)
	if err != nil {
		c.String(consts.StatusBadRequest, err.Error())
		return
	}

	fmt.Println(req)

	if len(req) == 0 { // 请求数据为空
		c.JSON(consts.StatusBadRequest, entity.HttpResult{Status: false, Code: "", Message: "请求数据为空。"})
	} else if len(req) == 1 { // 只有一条数据则直接返回
		c.JSON(consts.StatusOK, entity.HttpResult{Status: true, Code: "", Message: "mapBuf文件夹数据一致。"})
	} else {
		var firstValue int
		for i, id := range req {
			// 根据id获取对应的oss文件列表
			fileList, err := getExactedMapFileById(id)
			// 过滤特定后缀的文件列表
			fileList = filterBySuffixes(fileList, config.MapBufFiltersuffixes...)
			//fmt.Println("Filtered Strings:", fileList)

			if err != nil {
				c.String(consts.StatusBadRequest, err.Error())
				return
			}

			// 获取文件列表的总大小
			totalSize := calculateTotalFileSize(fileList)
			fmt.Println("Total Size:", totalSize)

			// 判断不同文件列表（mapBuf）中文件的总大小是否一致
			if i == 0 {
				firstValue = totalSize
			} else {
				if totalSize != firstValue {
					c.JSON(consts.StatusOK, entity.HttpResult{Status: false, Code: "", Message: "mapBuf文件夹数据不一致。"})
					return
				}
			}
		}

		c.JSON(consts.StatusOK, entity.HttpResult{Status: true, Code: "", Message: "mapBuf文件夹数据一致。"})
	}
}

// DownloadOSSFile 根据objectKey下载指定的oss文件
// @router /map/downloadossfile [GET]
func DownloadOSSFile(ctx context.Context, c *app.RequestContext) {
	objectKey := c.Query("objectKey")
	// 从OSS下载文件
	reader, err := config.OssBucket.GetObject(objectKey)

	if err != nil {
		c.JSON(http.StatusInternalServerError, map[string]string{"error": err.Error()})
		return
	}
	defer reader.Close()

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

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

// DownLoadZipFile 根据请求id从oss拉取并打包下载建图所需要的文件
// @router /map/downloadmapzipfile   [GET]
func DownLoadMapZipFile(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 := generateZipById(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)
}

// DownLoadMapBagFile 根据请求id从oss拉取并下载解析后的map.bag文件
// @router /map/downloadmapbagfile   [GET]
func DownLoadMapBagFile(ctx context.Context, c *app.RequestContext) {
	id := c.Query("id")
	fmt.Println("id: ", id)

	// 根据id获取对应的oss文件列表
	fileList, err := getExactedMapFileById(id)
	// 过滤特定后缀的文件列表
	fileList = filterBySuffixes(fileList, "map.bag")
	//fmt.Println("fileList", fileList)

	objectKey := fileList[0]
	// 从OSS下载文件
	reader, err := config.OssBucket.GetObject(objectKey)

	if err != nil {
		c.JSON(consts.StatusInternalServerError, entity.HttpResult{Status: false, Code: "", Message: "解析地图Bag下载失败。"})
		return
	}
	defer reader.Close()

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

	// 将文件流式传输回客户端
	data, err := io.ReadAll(reader)

	if err != nil {
		panic(err)
	}
	if _, err := c.Write(data); err != nil {
		c.JSON(consts.StatusInternalServerError, entity.HttpResult{Status: false, Code: "", Message: "解析地图Bag下载失败。"})
		return
	}
	c.JSON(consts.StatusOK, entity.HttpResult{Status: true, Code: "", Message: "解析地图Bag下载成功。"})
}

// 根据id获取解析后的地图文件列表
func getExactedMapFileById(id string) (fileList []string, err error) {
	url := config.SenceOssDownUrl + id

	// 构建请求
	req, err := http.NewRequest("GET", url, nil)
	if err != nil {
		fmt.Println("Error creating request:", err)
		return nil, err
	}

	// 添加认证头
	req.Header.Set("Authorization", config.Token)

	// 发送请求
	client := &http.Client{}
	resp, err := client.Do(req)
	if err != nil {
		fmt.Println("Error executing request:", err)
		return nil, err
	}

	defer resp.Body.Close()
	body, _ := ioutil.ReadAll(resp.Body)

	// Json转换为map
	var data map[string]interface{}
	err = json.Unmarshal(body, &data)

	// 提取响应体中的data字段
	dataField, ok := data["data"].([]interface{})
	if !ok {
		fmt.Println("Error extracting data field")
		return nil, err
	}

	// 转换字符串切片
	for _, item := range dataField {
		str, ok := item.(string)
		if !ok {
			fmt.Println("Error converting item to string")
			return nil, err
		}
		fileList = append(fileList, str)
	}

	return fileList, nil
}

// 根据id获取对应的原始bag文件
func getRosFileById(id string) (file string, err error) {
	url := config.SenceInfoUrl + id

	// 构建请求
	req, err := http.NewRequest("GET", url, nil)
	if err != nil {
		fmt.Println("Error creating request:", err)
		return "", err
	}

	// 添加认证头
	req.Header.Set("Authorization", config.Token)

	// 发送请求
	client := &http.Client{}
	resp, err := client.Do(req)
	if err != nil {
		fmt.Println("Error executing request:", err)
		return "", err
	}

	defer resp.Body.Close()
	body, _ := ioutil.ReadAll(resp.Body)

	// Json转换为map
	var data map[string]interface{}
	err = json.Unmarshal(body, &data)

	//fmt.Println("data:", data)
	// 提取响应体中的data字段
	dataField, ok := data["data"].(map[string]interface{})
	if !ok {
		fmt.Println("Error extracting data field")
		return "", err
	}
	// 从 data字段中提取 rosField
	rosField, ok := dataField["rosFileId"].(string)
	if !ok {
		fmt.Println("ID not found or not a string")
		return
	}
	if !ok {
		fmt.Println("Error extracting rosFileId field")
		return "", err
	}
	//println("rosFileId:", rosField)

	return rosField, nil
}

//// 根据id生成用于地图更新的压缩包
//func generateZipById(id string) (file string, tmpDir string, err error) {
//	// 根据id获取对应的oss文件列表
//	fileList, err := getExactedMapFileById(id)
//	// 过滤特定后缀的文件列表
//	fileList = filterBySuffixes(fileList, config.MapBufFiltersuffixes...)
//	//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
//	}
//
//	// 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
//	}
//	// 创建子文件夹 mapBuf
//	subDir := filepath.Join(baseDir, "mapBuf")
//	if err := os.Mkdir(subDir, 0755); err != nil {
//		fmt.Println("Error creating subdirectory:", err)
//		return "", "", err
//	}
//
//	// 从oss下载文件到 mapBuf文件夹
//	for _, file := range fileList {
//		err = config.OssBucket.GetObjectToFile(file, filepath.Join(subDir, filepath.Base(file)))
//		if err != nil {
//			fmt.Println("Error downloading mapBuf file:", err)
//			return "", "", err
//		}
//	}
//
//	// 从oss下载bag文件到 data文件夹
//	RosFileId, _ := getRosFileById(id)
//	err = config.OssBucket.GetObjectToFile(RosFileId, filepath.Join(baseDir, filepath.Base(RosFileId)))
//	if err != nil {
//		fmt.Println("Error downloading Bag file:", err)
//		return "", "", err
//	}
//
//	// 创建压缩文件
//	zipPath := filepath.Join(tmpDir, "mapFile-"+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 := addDirToZip(baseDir, zipWriter); err != nil {
//		fmt.Println("Error adding directory to ZIP:", err)
//		return "", "", err
//	}
//	fmt.Println("ZIP file created successfully.")
//
//	return zipPath, tmpDir, nil
//}

// 根据id生成用于地图更新的压缩包
func generateZipById(id string) (file string, tmpDir string, err error) {
	// 根据id获取对应的oss文件列表
	fileList, err := getExactedMapFileById(id)

	// 过滤特定后缀的文件列表
	fileList = filterBySuffixes(fileList, config.MapBufFiltersuffixes...)
	//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
	}

	// 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
	}

	// 根目录创建子文件夹 bag_folder
	bagFolderDir := filepath.Join(baseDir, "bag_folder")
	if err := os.Mkdir(bagFolderDir, 0755); err != nil {
		fmt.Println("Error creating subdirectory:", err)
		return "", "", err
	}

	// 根目录创建子文件夹 origin_map_folder
	originMapFolderDir := filepath.Join(baseDir, "origin_map_folder")
	if err := os.Mkdir(originMapFolderDir, 0755); err != nil {
		fmt.Println("Error creating subdirectory:", err)
		return "", "", err
	}

	// 子文件夹 bag_folder 创建子文件夹 mapBuf
	mapBufDir := filepath.Join(bagFolderDir, "mapBuf")
	if err := os.Mkdir(mapBufDir, 0755); err != nil {
		fmt.Println("Error creating subdirectory:", err)
		return "", "", err
	}

	// 从oss下载bag文件到 bag_folder 文件夹
	RosFileId, _ := getRosFileById(id)
	err = config.OssBucket.GetObjectToFile(RosFileId, filepath.Join(bagFolderDir, filepath.Base(RosFileId)))
	if err != nil {
		fmt.Println("Error downloading Bag file:", err)
		return "", "", err
	}

	// 从oss下载文件到 mapBuf 文件夹
	for _, file := range fileList {
		err = config.OssBucket.GetObjectToFile(file, filepath.Join(mapBufDir, filepath.Base(file)))
		if err != nil {
			fmt.Println("Error downloading mapBuf file:", err)
			return "", "", err
		}
	}

	// 从oss下载bag文件到 origin_map_folder 文件夹
	// 过滤特定后缀的文件列表
	fileList = filterBySuffixes(fileList, config.OriginMapFiltersuffixes...)
	for _, file := range fileList {
		err = config.OssBucket.GetObjectToFile(file, filepath.Join(originMapFolderDir, filepath.Base(file)))
		if err != nil {
			fmt.Println("Error downloading origin_map file:", err)
			return "", "", err
		}
	}

	// 创建压缩文件
	zipPath := filepath.Join(tmpDir, "mapFile-"+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 := addDirToZip(baseDir, zipWriter); err != nil {
		fmt.Println("Error adding directory to ZIP:", err)
		return "", "", err
	}
	fmt.Println("ZIP file created successfully.")

	return zipPath, tmpDir, nil
}

// 从字符串切片中筛选出以特定后缀结尾的字符串
func filterBySuffixes(strList []string, suffixes ...string) []string {
	var filtered []string
	for _, s := range strList {
		for _, suffix := range suffixes {
			//if strings.HasSuffix(s, suffix) {
			//	filtered = append(filtered, s)
			//	break
			//}
			if filepath.Base(s) == suffix {
				filtered = append(filtered, s)
				break
			}
		}
	}
	return filtered
}

// 计算oss中文件列表的总大小
func calculateTotalFileSize(fileList []string) int {
	var totalSize int
	for _, file := range fileList {
		size, err := util.GetOSSFileSize(config.OssBucket, file) // 获取oss中单个文件的大小
		if err != nil {
			return 0
		}
		totalSize += size
	}
	return totalSize
}

// 压缩文件夹
func addDirToZip(dirPath string, zipWriter *zip.Writer) error {
	filepath.Walk(dirPath, func(path string, info os.FileInfo, err error) error {
		if err != nil {
			return err
		}

		if info.IsDir() {
			return nil
		}

		file, err := os.Open(path)
		if err != nil {
			return err
		}
		defer file.Close()

		// 处理路径，确保保留相对路径结构
		relPath, err := filepath.Rel(dirPath, path)
		if err != nil {
			return err
		}
		header, err := zip.FileInfoHeader(info)
		if err != nil {
			return err
		}

		header.Name = filepath.ToSlash(relPath)

		writer, err := zipWriter.CreateHeader(header)
		if err != nil {
			return err
		}

		if _, err := io.Copy(writer, file); err != nil {
			return err
		}

		return nil
	})

	return nil
}