package example

import (
	"errors"

	"gorm.io/gorm"
	"pychr/global"
	"pychr/model/example"
)

type FileUploadAndDownloadService struct{}

// @author: [piexlmax](https://github.com/piexlmax)
// @function: FindOrCreateFile
// @description: 上传文件时检测当前文件属性，如果没有文件则创建，有则返回文件的当前切片
// @param: fileMd5 string, fileName string, chunkTotal int
// @return: file model.ExaFile, err error

func (e *FileUploadAndDownloadService) FindOrCreateFile(fileMd5 string, fileName string, chunkTotal int) (file example.ExaFile, err error) {
	var cfile example.ExaFile
	cfile.FileMd5 = fileMd5
	cfile.FileName = fileName
	cfile.ChunkTotal = chunkTotal

	if errors.Is(global.GVA_DB.Where("file_md5 = ? AND is_finish = ?", fileMd5, true).First(&file).Error, gorm.ErrRecordNotFound) {
		err = global.GVA_DB.Where("file_md5 = ? AND file_name = ?", fileMd5, fileName).Preload("ExaFileChunk").FirstOrCreate(&file, cfile).Error
		return file, err
	}
	cfile.IsFinish = true
	cfile.FilePath = file.FilePath
	err = global.GVA_DB.Create(&cfile).Error
	return cfile, err
}

// @author: [piexlmax](https://github.com/piexlmax)
// @function: CreateFileChunk
// @description: 创建文件切片记录
// @param: id uint64, fileChunkPath string, fileChunkNumber int
// @return: error

func (e *FileUploadAndDownloadService) CreateFileChunk(id uint64, fileChunkPath string, fileChunkNumber int) error {
	var chunk example.ExaFileChunk
	chunk.FileChunkPath = fileChunkPath
	chunk.ExaFileID = id
	chunk.FileChunkNumber = fileChunkNumber
	err := global.GVA_DB.Create(&chunk).Error
	return err
}

// @author: [piexlmax](https://github.com/piexlmax)
// @function: DeleteFileChunk
// @description: 删除文件切片记录
// @param: fileMd5 string, fileName string, filePath string
// @return: error

func (e *FileUploadAndDownloadService) DeleteFileChunk(fileMd5 string, filePath string) error {
	var chunks []example.ExaFileChunk
	var file example.ExaFile
	err := global.GVA_DB.Where("file_md5 = ? ", fileMd5).First(&file).
		Updates(map[string]interface{}{
			"IsFinish":  true,
			"file_path": filePath,
		}).Error
	if err != nil {
		return err
	}
	err = global.GVA_DB.Where("exa_file_id = ?", file.ID).Delete(&chunks).Unscoped().Error
	return err
}