package utils

// MapStringKeys 取出map的key
func MapStringKeys(collection *map[string]struct{}) []interface{} {
	result := make([]interface{}, 0, len(*collection))
	for key := range *collection {
		result = append(result, key)
	}

	return result
}

// GetOneKeyOfMapString 取出Map的一个key
func GetOneKeyOfMapString(collection map[string]string) string {
	for k := range collection {
		return k
	}
	return ""
}

// sources源数组，num拆分份数，size每份的大小
func SplitArray(sources []string, num, pageSize int64) [][]string {
	max := int64(len(sources))
	if max < num {
		return nil
	}
	var segmens = make([][]string, 0)
	quantity := pageSize
	end := int64(0)
	for i := int64(1); i <= num; i++ {
		qu := i * quantity
		if i != num {
			segmens = append(segmens, sources[i-1+end:qu])
		} else {
			segmens = append(segmens, sources[i-1+end:])
		}
		end = qu - i
	}
	return segmens
}

// sourceslen源数组长度，pageSize页数据量
// 获取拆分份数
func SplitArrayCnt(sourceslen, pageSize int) int {
	if sourceslen < pageSize {
		return 1
	}
	s := sourceslen / pageSize
	y := sourceslen % pageSize
	if y > 0 {
		return s + 1
	} else {
		return s
	}
}