package service

import (
	"blog/internal/consts"
	"blog/internal/model/admin"
	"blog/internal/model/vo"
	"blog/third_party/database"
	"context"
	"log"
	"time"
)

type fileService struct {
}

var FileService fileService

func (*fileService) GetFile(id string) (vo.CommonFiles, error) {
	ctx := context.Background()
	var file vo.CommonFiles
	var bytes []byte
	err := database.RedisTemplate.Get(ctx, consts.REDIS_FILE+id).Scan(&file)
	//如果缓存不存在，则查数据库并存入Redis
	if err != nil || file.Id == "" {
		database.GormTemplate.Table("common_files").Where("id = ?", id).First(&file)
		bytes = file.Data
		err = database.RedisTemplate.Set(ctx, consts.REDIS_FILE+id, &file, time.Duration(0)).Err()
		if err != nil {
			log.Println(err)
		}
		err = database.RedisTemplate.Set(ctx, consts.REDIS_FILE_BYTES+id, bytes, time.Duration(0)).Err()
		if err != nil {
			log.Println(err)
		}
		return file, nil
	}
	bytes, err = database.RedisTemplate.Get(ctx, consts.REDIS_FILE_BYTES+id).Bytes()
	file.Data = bytes
	return file, err
}

func (*fileService) PageSysFiles(page int, itemsPerPage int) vo.Page[admin.SysFile] {
	var content []admin.SysFile
	var totalElements int64
	database.GormTemplate.Table("common_files").Count(&totalElements)
	database.GormTemplate.Table("common_files").
		Where("del != ?", 1).
		Offset((page - 1) * itemsPerPage).
		Limit(itemsPerPage).
		Order("create_time DESC").
		Find(&content)

	pre := int(totalElements) % itemsPerPage
	if pre > 0 {
		pre = 1
	}
	var totalPages int = int(totalElements)/itemsPerPage + pre

	return vo.Page[admin.SysFile]{TotalElements: totalElements, TotalPages: totalPages, Number: page, Content: content}
}