package util

import (
	"bytes"
	"fmt"
	"math"
	"strconv"
	"strings"
	"time"
)

func CurrentMaxFrameId() int32 {
	currentHour := time.Now().Hour()
	return int32(math.Floor(float64(currentHour/2))) * 10
}

func ArrayInt32ToStrings(cowIds []int32, cutset string) string {
	var cows bytes.Buffer
	if len(cowIds) <= 0 {
		return cows.String()
	}
	for i, v := range cowIds {
		if i > 0 {
			cows.WriteString(cutset)
		}
		cows.WriteString(strconv.Itoa(int(v))) // 将整数转换为字符串
	}
	return cows.String()
}

// ConvertCowIdsToInt64Slice 将逗号拼接的字符串转换为 int64 切片
func ConvertCowIdsToInt64Slice(input string) ([]int64, error) {
	// 如果输入为空，直接返回空切片
	if input == "" {
		return []int64{}, nil
	}

	// 按逗号分割字符串
	parts := strings.Split(input, ",")

	// 初始化结果切片
	result := make([]int64, 0, len(parts))

	// 遍历每个部分，转换为 int64
	for _, part := range parts {
		// 去除空格
		part = strings.TrimSpace(part)
		if part == "" {
			continue // 忽略空字符串
		}

		// 转换为 int64
		num, err := strconv.ParseInt(part, 10, 64)
		if err != nil {
			return nil, fmt.Errorf("invalid number: %s", part)
		}

		// 添加到结果切片
		result = append(result, num)
	}
	return result, nil
}

// GetMonthStartAndEndTimestamp 获取当前月份的开始时间戳和结束时间戳
func GetMonthStartAndEndTimestamp() (startTimestamp, endTimestamp int64) {
	// 获取当前时间
	now := time.Now()

	// 获取当前月份的第一天
	startOfMonth := time.Date(now.Year(), now.Month(), 1, 0, 0, 0, 0, now.Location())

	// 获取下一个月份的第一天，然后减去一秒，得到当前月份的最后一天
	endOfMonth := startOfMonth.AddDate(0, 1, 0).Add(-time.Second)

	// 转换为时间戳
	startTimestamp = startOfMonth.Unix()
	endTimestamp = endOfMonth.Unix()

	return startTimestamp, endTimestamp
}

// SubDays 计算两个日期(时间戳)之间的天数差
func SubDays(startDay, endDay int64) int32 {
	s1 := time.Unix(startDay, 0)
	s2 := time.Unix(endDay, 0)
	return int32(s2.Sub(s1).Hours() / 24)
}

func TimeParseLocal(layout, dateTime string) (time.Time, error) {
	loc, _ := time.LoadLocation("Local")
	return time.ParseInLocation(layout, dateTime, loc)
}

func Substr(s string, start, length int) string {
	// 转换为rune切片以正确处理Unicode字符
	runes := []rune(s)
	l := start + length
	if l > len(runes) {
		l = len(runes)
	}
	return string(runes[start:l])
}