package util

import (
	"math/rand"
	"regexp"
	"strings"
)

// RandStringRunes 返回随机字符串
func RandStringRunes(n int) string {
	var letterRunes = []rune("1234567890abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ")

	b := make([]rune, n)
	for i := range b {
		b[i] = letterRunes[rand.Intn(len(letterRunes))]
	}
	return string(b)
}

// ContainsUint 返回list中是否包含
func ContainsUint(s []uint, e uint) bool {
	for _, a := range s {
		if a == e {
			return true
		}
	}
	return false
}

// ContainsString 返回list中是否包含
func ContainsString(s []string, e string) bool {
	for _, a := range s {
		if a == e {
			return true
		}
	}
	return false
}

// Replace 根据替换表执行批量替换
func Replace(table map[string]string, s string) string {
	for key, value := range table {
		s = strings.Replace(s, key, value, -1)
	}
	return s
}

// BuildRegexp 构建用于SQL查询用的多条件正则
func BuildRegexp(search []string, prefix, suffix, condition string) string {
	var res string
	for key, value := range search {
		res += prefix + regexp.QuoteMeta(value) + suffix
		if key < len(search)-1 {
			res += condition
		}
	}
	return res
}