// bytepacket 包示例：二进制封包/解包（小端序，兼容易语言协议，含 GBK 字符串与易语言日期）
package main

import (
	"fmt"

	"git.zeroonesoft.cn/golib/zogo/bytepacket"
)

func main() {
	// ===== 写入封包 =====
	p := bytepacket.NewPacket(nil)
	p.WriteInt32(100)
	p.WriteUInt16(200)
	_ = p.WriteString("hello")
	_ = p.WriteStringGbk("中文GBK")
	_ = p.WriteBytes([]byte{1, 2, 3})

	data := p.GetData()
	fmt.Printf("封包总长: %d 字节\n", len(data))

	// ===== 读取封包（按写入顺序读出）=====
	r := bytepacket.NewPacket(data)
	fmt.Println("ReadInt32:", r.ReadInt32())
	fmt.Println("ReadUInt16:", r.ReadUInt16())
	s, _ := r.ReadString()
	fmt.Println("ReadString:", s)
	gbk, _ := r.ReadStringGbk()
	fmt.Println("ReadStringGbk:", gbk)
	fmt.Println("ReadBytes:", r.ReadBytes())

	// ===== GBK / UTF-8 互转 =====
	gbkBytes, _ := bytepacket.Utf8ToGbk([]byte("编码转换"))
	fmt.Printf("UTF-8→GBK: % X\n", gbkBytes)
	utf8Bytes, _ := bytepacket.GbkToUtf8(gbkBytes)
	fmt.Println("GBK→UTF-8:", string(utf8Bytes))

	// ===== 易语言日期时间（float64 天数，起点 1899-12-30）=====
	d := bytepacket.NewPacket(nil)
	d.WriteFloat64(45292.5) // ≈ 2024-01-01 12:00:00
	t := d.ReadElangDateTime()
	fmt.Println("ReadElangDateTime:", t.Format("2006-01-02 15:04:05"))
}