package main

import (
	"fmt"
	"strconv"
	"time"
)

// 分数计算常量
const (
	UnreadMultiplier = 10000.0 // 未读消息数乘数，用于小数部分存储
)

// calculateScore 计算有序集合的分数，同时存储时间戳和未读消息数
// 整数部分：Unix时间戳，小数部分：未读消息数（除以乘数）
func calculateScore(timestamp int64, unreadCount int) float64 {
	score := float64(timestamp) + (float64(unreadCount) / UnreadMultiplier)
	fmt.Printf("calculateScore: timestamp=%d, unreadCount=%d, score=%f\n", timestamp, unreadCount, score)
	return score
}

// parseScore 从分数中解析出时间戳和未读消息数
func parseScore(score float64) (timestamp int64, unreadCount int) {
	timestamp = int64(score) // 整数部分是时间戳
	decimalPart := score - float64(timestamp)
	// 使用四舍五入来处理浮点数精度问题
	unreadCount = int(decimalPart*UnreadMultiplier + 0.5)
	fmt.Printf("parseScore: score=%f, timestamp=%d, decimalPart=%f, unreadCount=%d\n", score, timestamp, decimalPart, unreadCount)
	return
}

func main() {
	fmt.Println("=== 分数计算测试 ===")

	// 测试用例
	timestamp := time.Now().Unix()
	fmt.Printf("原始时间戳: %d\n\n", timestamp)

	// 测试1: 未读消息数为0
	fmt.Println("测试1: 未读消息数为0")
	score1 := calculateScore(timestamp, 0)
	ts1, unread1 := parseScore(score1)
	fmt.Printf("结果: timestamp=%d, unreadCount=%d\n\n", ts1, unread1)

	// 测试2: 未读消息数为1
	fmt.Println("测试2: 未读消息数为1")
	score2 := calculateScore(timestamp, 1)
	ts2, unread2 := parseScore(score2)
	fmt.Printf("结果: timestamp=%d, unreadCount=%d\n\n", ts2, unread2)

	// 测试3: 未读消息数为5
	fmt.Println("测试3: 未读消息数为5")
	score3 := calculateScore(timestamp, 5)
	ts3, unread3 := parseScore(score3)
	fmt.Printf("结果: timestamp=%d, unreadCount=%d\n\n", ts3, unread3)

	// 测试4: 未读消息数为100
	fmt.Println("测试4: 未读消息数为100")
	score4 := calculateScore(timestamp, 100)
	ts4, unread4 := parseScore(score4)
	fmt.Printf("结果: timestamp=%d, unreadCount=%d\n\n", ts4, unread4)

	// 测试5: 验证小数部分的精度
	fmt.Println("测试5: 小数部分精度验证")
	testScore := 1703123456.123
	fmt.Printf("测试分数: %f\n", testScore)
	ts5, unread5 := parseScore(testScore)
	fmt.Printf("解析结果: timestamp=%d, unreadCount=%d\n\n", ts5, unread5)

	// 测试6: 字符串转换测试
	fmt.Println("测试6: 字符串转换测试")
	scoreStr := fmt.Sprintf("%.6f", score2)
	fmt.Printf("分数字符串: %s\n", scoreStr)
	if parsedScore, err := strconv.ParseFloat(scoreStr, 64); err == nil {
		ts6, unread6 := parseScore(parsedScore)
		fmt.Printf("字符串解析结果: timestamp=%d, unreadCount=%d\n", ts6, unread6)
	}
}