package items

import (
	"crypto/rand"
	"errors"
	"go_dreamfactory/lego/core"
	cfg "go_dreamfactory/sys/configure/structs"
	"math/big"
)

const ( //Redis
	Redis_PackCache string        = "pack:%s" //背包缓存数据存放key
	DB_PackTable    core.SqlTable = "pack"    //背包数据库定义表
)

const (
	// GridCapMaxNum   = 99   //单个格子的最大容量
	GridMaxNUm      = 1000 //背包格子数量上限
	Pack_Expiration = -1   //背包缓存数据过期时间
)

const (
	itemuse_nouse         int32 = 1 //不可使用
	itemuse_jump          int32 = 2 //跳转
	itemuse_exchange      int32 = 3 //合成/分解(体力，兑换)
	itemuse_optionalbox   int32 = 4 //自选宝箱
	itemuse_randombox     int32 = 5 //随机宝箱
	itemuse_staminapotion int32 = 6 //体力药剂使用
)

var (
	NoFoundItemConfig  = errors.New("no found itemconfig!") //道具配置未找到
	ItemNotEnoughError = errors.New("item not enough!")     //物品不足
	NoFoundGirdError   = errors.New("no found gvrid!")      //未找到格子
	PackGridNumUpper   = errors.New("grid amount upper!")   //背包格子达到上限
	GirdAmountUpper    = errors.New("grid amount upper!")   //格子容量达到上限
)

// 随机权重宝箱
func RandomProps(group []*cfg.GameDropData) (prop *cfg.GameDropData) {
	if group == nil || len(group) == 0 {
		return
	}
	var (
		totle int64
		curr  int64
		temp  int64
	)
	for _, v := range group {
		totle += int64(v.P)
	}
	n, _ := rand.Int(rand.Reader, big.NewInt(totle))
	curr = n.Int64()
	for _, v := range group {
		temp += int64(v.P)
		if curr <= temp {
			prop = v
			return
		}
	}
	return
}