package oss

import (
	"enaklo-pos-be/internal/entity"
	"enaklo-pos-be/internal/handlers/response"
	"enaklo-pos-be/internal/services"
	"fmt"
	"mime/multipart"
	"net/http"

	"github.com/gin-gonic/gin"
)

const _oneMB = 1 << 20 // 1MB
const _maxUploadSizeMB = 2 * _oneMB
const _folderName = "/public"

type OssHandler struct {
	ossService services.OSSService
}

func (h *OssHandler) Route(group *gin.RouterGroup, jwt gin.HandlerFunc) {
	route := group.Group("/file")

	route.POST("/upload", h.UploadFile)
}

func NewOssHandler(ossService services.OSSService) *OssHandler {
	return &OssHandler{
		ossService: ossService,
	}
}

// UploadFile handles the uploading of a file to OSS.
// @Summary Upload a file to OSS
// @Description Upload a file to Alibaba Cloud OSS with the provided details.
// @Accept mpfd
// @Produce json
// @Param Authorization header string true "JWT token"
// @Param file formData file true "File to upload (max size: 2MB)"
// @Success 200 {object} response.BaseResponse{data=entity.UploadFileResponse} "File uploaded successfully"
// @Failure 400 {object} response.BaseResponse{data=errors.Error} "Bad request"
// @Failure 401 {object} response.BaseResponse{data=errors.Error} "Unauthorized"
// @Tags File Upload API
// @Router /api/v1/file/upload [post]
func (h *OssHandler) UploadFile(c *gin.Context) {
	// Get the oss file from the request form
	file, err := c.FormFile("file")
	if err != nil {
		c.JSON(http.StatusBadRequest, response.BaseResponse{
			ErrorMessage: "Failed to retrieve the file",
		})
		return
	}

	// Check if the uploaded file is an image (photo)
	//if !isPDFFile(file) {
	//	c.JSON(http.StatusBadRequest, response.BaseResponse{
	//		ErrorMessage: "Only image files are allowed",
	//	})
	//	return
	//}

	// Check if the file size is not greater than the maximum allowed size
	if file.Size > _maxUploadSizeMB {
		c.JSON(http.StatusBadRequest, response.BaseResponse{
			ErrorMessage: fmt.Sprintf("The file is too big. The maximum size is %d", _maxUploadSizeMB/_oneMB),
		})
		return
	}

	// Call the service to oss the file to Alibaba Cloud OSS
	ret, err := h.ossService.UploadFile(c, &entity.UploadFileRequest{
		FileHeader: file,
		FolderName: _folderName,
	})

	if err != nil {
		response.ErrorWrapper(c, err)
		return
	}

	c.JSON(http.StatusOK, response.BaseResponse{
		Data:    ret,
		Success: true,
	})
}

func isPDFFile(file *multipart.FileHeader) bool {
	contentType := file.Header.Get("Content-Type")
	return contentType == "application/pdf"
}