package model

import (
	"github.com/HFO4/cloudreve/pkg/cache"
	"github.com/jinzhu/gorm"
	"strconv"
	"time"
)

// StoragePack 容量包模型
type StoragePack struct {
	// 表字段
	gorm.Model
	Name        string
	UserID      uint
	ActiveTime  *time.Time
	ExpiredTime *time.Time `gorm:"index:expired"`
	Size        uint64
}

// GetAvailablePackSize 返回给定用户当前可用的容量包总容量
func (user *User) GetAvailablePackSize() uint64 {
	var (
		packs       []StoragePack
		total       uint64
		firstExpire *time.Time
		timeNow     = time.Now()
		ttl         int64
	)

	// 尝试从缓存中读取
	cacheKey := "pack_size_" + strconv.FormatUint(uint64(user.ID), 10)
	if total, ok := cache.Get(cacheKey); ok {
		return total.(uint64)
	}

	// 查找所有有效容量包
	DB.Where("expired_time > ? AND user_id = ?", timeNow, user.ID).Find(&packs)

	// 计算总容量, 并找到其中最早的过期时间
	for _, v := range packs {
		total += v.Size
		if firstExpire == nil {
			firstExpire = v.ExpiredTime
			continue
		}
		if v.ExpiredTime != nil && firstExpire.After(*v.ExpiredTime) {
			firstExpire = v.ExpiredTime
		}
	}

	// 用最早的过期时间计算缓存TTL，并写入缓存
	if firstExpire != nil {
		ttl = firstExpire.Unix() - timeNow.Unix()
		if ttl > 0 {
			_ = cache.Set(cacheKey, total, int(ttl))
		}
	}

	return total
}