package upload

import (
	"bytes"
	"fmt"
	"io"
	"kpt-pasture/config"
	"kpt-pasture/http/middleware"
	"net/http"
	"os"
	"path/filepath"
	"time"

	"gitee.com/xuyiping_admin/pkg/apierr"
	"gitee.com/xuyiping_admin/pkg/xerr"
	"github.com/gin-gonic/gin"
	"github.com/xuri/excelize/v2"
)

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) {
	// 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
	}

	// 检查文件类型
	ext := filepath.Ext(file.Filename)
	if ext != ".xlsx" && ext != ".xls" {
		apierr.AbortBadRequest(c, http.StatusBadRequest, xerr.Custom("只支持Excel文件(.xlsx, .xls)"))
		return
	}

	// 检查文件大小
	if file.Size == 0 {
		apierr.AbortBadRequest(c, http.StatusBadRequest, xerr.Custom("文件为空"))
		return
	}

	// 创建保存目录
	uploadDir := fmt.Sprintf("%s/files/excel", config.WorkDir)
	if err := os.MkdirAll(uploadDir, 0755); err != nil {
		apierr.AbortBadRequest(c, http.StatusInternalServerError, xerr.Customf("创建目录失败: %s", err.Error()))
		return
	}

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

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

	// 打开上传的文件
	src, err := file.Open()
	if err != nil {
		apierr.AbortBadRequest(c, http.StatusInternalServerError, xerr.Customf("打开文件失败: %s", err.Error()))
		return
	}
	defer src.Close()

	// 读取文件内容
	fileBytes, err := io.ReadAll(src)
	if err != nil {
		apierr.AbortBadRequest(c, http.StatusInternalServerError, xerr.Customf("读取文件内容失败: %s", err.Error()))
		return
	}

	// 检查文件头部签名
	if len(fileBytes) < 8 {
		apierr.AbortBadRequest(c, http.StatusBadRequest, xerr.Custom("文件格式不正确"))
		return
	}

	// 检查Excel文件签名
	isExcel := false
	if ext == ".xlsx" {
		// XLSX文件签名
		if bytes.Equal(fileBytes[:4], []byte{0x50, 0x4B, 0x03, 0x04}) {
			isExcel = true
		}
	} else if ext == ".xls" {
		// XLS文件签名
		if bytes.Equal(fileBytes[:8], []byte{0xD0, 0xCF, 0x11, 0xE0, 0xA1, 0xB1, 0x1A, 0xE1}) {
			isExcel = true
		}
	}

	if !isExcel {
		apierr.AbortBadRequest(c, http.StatusBadRequest, xerr.Custom("文件格式不正确，请确保上传的是有效的Excel文件"))
		return
	}

	// 读取Excel文件
	options := excelize.Options{
		RawCellValue: true,
	}
	f, err := excelize.OpenReader(bytes.NewReader(fileBytes), options)
	if err != nil {
		// 如果直接读取失败，尝试从保存的文件读取
		f, err = excelize.OpenFile(filePath)
		if err != nil {
			apierr.AbortBadRequest(c, http.StatusInternalServerError, xerr.Customf("读取Excel文件失败，请确保文件格式正确: %s", err.Error()))
			return
		}
	}
	defer f.Close()

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

	// 处理Excel数据
	if len(rows) < 2 {
		apierr.AbortBadRequest(c, http.StatusBadRequest, xerr.Custom("Excel文件数据为空"))
		return
	}

	// 获取表头并转换为中文
	headers := rows[0]
	headerMap := make(map[string]string)
	for _, header := range headers {
		headerMap[header] = header
	}

	// 处理数据行
	var data []map[string]string
	for i, row := range rows[1:] {
		if len(row) != len(headers) {
			apierr.AbortBadRequest(c, http.StatusBadRequest, xerr.Customf("第%d行数据列数与表头不匹配", i+2))
			return
		}

		rowData := make(map[string]string)
		for j, cell := range row {
			rowData[headers[j]] = cell
		}
		data = append(data, rowData)
	}

	// 调用后端服务处理数据
	if err := middleware.BackendOperation(c).OpsService.ImportExcel(c, data); err != nil {
		apierr.AbortBadRequest(c, http.StatusBadRequest, err)
		return
	}

	c.JSON(http.StatusOK, gin.H{
		"code": http.StatusOK,
		"msg":  "导入成功",
		"data": 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)
}