package upload

import (
	"fmt"
	"kpt-pasture/config"
	"kpt-pasture/http/middleware"
	"mime/multipart"
	"net/http"
	"os"
	"path/filepath"
	"strings"
	"time"

	"github.com/xuri/excelize/v2"

	operationPb "gitee.com/xuyiping_admin/go_proto/proto/go/backend/operation"
	"gitee.com/xuyiping_admin/pkg/ginutil"

	"gitee.com/xuyiping_admin/pkg/apierr"
	"gitee.com/xuyiping_admin/pkg/xerr"
	"github.com/gin-gonic/gin"
)

func Photos(c *gin.Context) {

	form, err := c.MultipartForm()
	if err != nil {
		apierr.AbortBadRequest(c, http.StatusBadRequest, xerr.Customf("No multipartForm: %s", err.Error()))
		return
	}
	files := form.File["uploads"]
	// 验证文件数量
	if len(files) == 0 {
		apierr.AbortBadRequest(c, http.StatusBadRequest, xerr.Custom("No files selected"))
		return
	}

	res, err := middleware.BackendOperation(c).OpsService.Photos(c, files)
	if err != nil {
		apierr.AbortBadRequest(c, http.StatusBadRequest, err)
		return
	}

	c.JSON(http.StatusOK, gin.H{"code": http.StatusOK, "Msg": "ok", "data": res})
}

func Files(c *gin.Context) {
	// 1. 获取上传的文件
	file, err := c.FormFile("file")
	if err != nil {
		apierr.AbortBadRequest(c, http.StatusBadRequest, xerr.Customf("获取文件失败: %s", err.Error()))
		return
	}

	cf := GetExcelImportConfig(c.GetHeader("farmid"))
	// 2. 验证文件基本属性
	if err = validateFile(file, cf); err != nil {
		apierr.AbortBadRequest(c, http.StatusBadRequest, err)
		return
	}

	// 3. 保存文件到临时目录
	filePath, err := saveUploadedFile(c, file)
	if err != nil {
		apierr.AbortBadRequest(c, http.StatusInternalServerError, err)
		return
	}
	defer os.Remove(filePath) // 处理完成后删除临时文件

	// 4. 读取并验证Excel文件
	excelData, err := readExcelFile(filePath, filepath.Ext(file.Filename))
	if err != nil {
		apierr.AbortBadRequest(c, http.StatusInternalServerError, err)
		return
	}
	// 5. 验证表头
	if err = validateHeaders(excelData[0], cf.RequiredHeaders); err != nil {
		apierr.AbortBadRequest(c, http.StatusInternalServerError, err)
		return
	}
	// 实现处理逻辑
	if err = middleware.BackendOperation(c).OpsService.ImportExcel2(c, excelData, cf.RequiredHeaders); err != nil {
		apierr.AbortBadRequest(c, http.StatusBadRequest, err)
		return
	}

	ginutil.JSONResp(c, &operationPb.CommonOK{
		Code: http.StatusOK,
		Msg:  "ok",
		Data: &operationPb.Success{Success: true},
	})
}

// ExcelImportConfig 导入配置
type ExcelImportConfig struct {
	AllowedExtensions []string
	MaxFileSize       int64
	RequiredHeaders   []string // 必须包含的表头
	HeadOfField       []string
}

// readExcelFile 读取Excel文件
func readExcelFile(filePath, ext string) ([][]string, error) {
	// 尝试使用excelize读取
	f, err := excelize.OpenFile(filePath)
	if err != nil {
		// 如果是xls格式且读取失败，尝试使用xls库
		if ext == ".xls" {
			return readXlsFile(filePath)
		}
		return nil, xerr.Customf("读取Excel文件失败: %s", err.Error())
	}
	defer f.Close()

	// 获取第一个工作表
	sheetName := f.GetSheetName(0)
	rows, err := f.GetRows(sheetName)
	if err != nil {
		return nil, xerr.Customf("读取工作表失败: %s", err.Error())
	}

	if len(rows) == 0 {
		return nil, xerr.Custom("Excel文件为空")
	}

	return rows, nil
}

// readXlsFile 使用xls库读取旧版Excel文件
func readXlsFile(filePath string) ([][]string, error) {
	// 这里需要实现xls文件的读取逻辑
	// 可以使用第三方库如github.com/extrame/xls
	return nil, xerr.Custom("暂不支持.xls格式文件")
}

func GetExcelImportConfig(farmId string) *ExcelImportConfig {
	switch farmId {
	case "e50cd455dec93edf3d8135abbc770680":
		return &ExcelImportConfig{
			AllowedExtensions: []string{".xlsx", ".xls"},
			RequiredHeaders: []string{"", "", "耳号", "牛舍名称", "性别", "出生日期", "胎次", "进场日期", "父号", "母号", "最近配种日期", "预产期", "配后天数",
				"累计配次", "最近妊检日期", "最近产犊日期", "产后天数", "品种", "出生重量", "断奶日期", "是否禁配", "体重", "体高", "流产日期", "流产原因"},
			HeadOfField: []string{"", "", "earNumber", "penName", "sex", "birthAt", "lact", "admissionAt", "fatherNumber", "motherNumber",
				"lastMatingAt", "", "matingAge", "allMatingTimes", "lastPregnantCheckAt", "lastCalvingAt", "lactationAge",
				"cowKind", "birthWeight", "weaningAt", "isForbiddenMating", "currentWeight", "currenWtHeight", "lastAbortionAt", ""},
			MaxFileSize: 10 << 20,
		}
	default:
		return nil
	}
}

// ExcelHandler Excel处理接口
type ExcelHandler interface {
	ProcessExcelData([][]string) error
}

// validateFile 验证文件基本属性
func validateFile(file *multipart.FileHeader, cfg *ExcelImportConfig) error {
	// 检查文件扩展名
	ext := strings.ToLower(filepath.Ext(file.Filename))
	validExt := false
	for _, allowedExt := range cfg.AllowedExtensions {
		if ext == allowedExt {
			validExt = true
			break
		}
	}
	if !validExt {
		return xerr.Customf("不支持的文件类型，仅支持: %v", cfg.AllowedExtensions)
	}

	// 检查文件大小
	if file.Size > cfg.MaxFileSize {
		return xerr.Customf("文件大小超过限制(最大%dMB)", cfg.MaxFileSize>>20)
	}

	return nil
}

// saveUploadedFile 保存上传的文件
func saveUploadedFile(c *gin.Context, file *multipart.FileHeader) (string, error) {
	// 创建临时目录
	uploadDir := filepath.Join(config.WorkDir, "temp", "excel")
	if err := os.MkdirAll(uploadDir, 0755); err != nil {
		return "", xerr.Customf("创建临时目录失败: %s", err.Error())
	}

	// 生成唯一文件名
	filename := fmt.Sprintf("%d%s", time.Now().UnixNano(), filepath.Ext(file.Filename))
	filePath := filepath.Join(uploadDir, filename)

	// 保存文件
	if err := c.SaveUploadedFile(file, filePath); err != nil {
		return "", xerr.Customf("保存文件失败: %s", err.Error())
	}

	return filePath, nil
}

// validateHeaders 验证表头
func validateHeaders(headers []string, requiredHeaders []string) error {
	if len(requiredHeaders) == 0 {
		return nil
	}

	headerMap := make(map[string]bool)
	for _, h := range headers {
		headerMap[strings.TrimSpace(h)] = true
	}

	var missingHeaders []string
	for _, req := range requiredHeaders {
		if req == "" {
			continue
		}
		if !headerMap[req] {
			missingHeaders = append(missingHeaders, req)
		}
	}
	if len(missingHeaders) > 0 {
		return xerr.Customf("缺少必要表头: %v", missingHeaders)
	}
	return nil
}

func OssVideo(c *gin.Context) {
	filename := c.Param("name")
	videoPath := fmt.Sprintf("%s/files/video/%s", config.WorkDir, filename)

	// 打开视频文件
	file, err := os.Open(videoPath)
	if err != nil {
		c.JSON(http.StatusNotFound, gin.H{"error": "Video not found"})
		return
	}
	defer file.Close()
	fileInfo, err := file.Stat()
	if err != nil {
		c.JSON(http.StatusInternalServerError, gin.H{"error": "Could not get file info"})
		return
	}

	// 设置响应头
	c.Header("Content-Type", "video/mp4")
	c.Header("Content-Length", fmt.Sprintf("%d", fileInfo.Size()))

	// 流式传输文件内容
	http.ServeContent(c.Writer, c.Request, fileInfo.Name(), fileInfo.ModTime(), file)
}