package main

import (
	"encoding/binary"
	"encoding/json"
	"fmt"
	"io"
	"git.wanbits.io/joe/nnet"
)

type EchoPacket struct {
	Id  int32
	Msg string
}

func (self *EchoPacket) ShouldClose() (bool, int32) {
	if self.Msg == "quit" {
		return true, 8
	}
	return false, 0
}

type TcpProtocol struct {
}

func (self *TcpProtocol) ReadPacket(conn nnet.IConn) (nnet.IPacket, error) {
	buf := make([]byte, 2048)
	n, err := io.ReadFull(conn, buf[:4])
	if err != nil {
		fmt.Println("ERROR1:", err)
		return nil, err
	}
	if n != 4 {
		fmt.Println("ERROR2:", "n != 4")
		return nil, nnet.ErrReadBlocking
	}
	pkt := &EchoPacket{}
	dataLen := binary.LittleEndian.Uint32(buf[:4])
	n, err = io.ReadFull(conn, buf[4:4+dataLen])
	if n != int(dataLen) {
		fmt.Println("ERROR3:", "n != dataLen", n, "!=", dataLen)
		return nil, nnet.ErrReadBlocking
	}
	pkt.Id = int32(binary.LittleEndian.Uint32(buf[4:8]))
	pkt.Msg = string(buf[8:])

	return pkt, nil
}

func (self *TcpProtocol) Serialize(packet nnet.IPacket) ([]byte, error) {
	p, yes := packet.(*EchoPacket)
	if !yes {
		fmt.Println("ERROR5:", "!yes")
		return nil, nnet.ErrReadBlocking // some error
	}
	buf := make([]byte, 2048)

	dataLen := 4 + len(p.Msg)
	binary.LittleEndian.PutUint32(buf, uint32(dataLen))
	binary.LittleEndian.PutUint32(buf[4:], uint32(p.Id))
	copy(buf[8:], []byte(p.Msg))
	return buf[:8+len(p.Msg)], nil
}

type WsProtocol struct {
}

func (self *WsProtocol) ReadPacket(conn nnet.IConn) (nnet.IPacket, error) {
	buf := make([]byte, 2048)
	n, err := conn.Read(buf)
	if err != nil {
		fmt.Println("ERROR1:", err)
		return nil, err
	}
	//TODO decrypt
	//TODO uncompress
	pkt := &EchoPacket{}
	err = json.Unmarshal(buf[:n], pkt)
	if err != nil {
		fmt.Println("ERROR2:", err)
		return nil, err
	}
	return pkt, nil
}

func (self *WsProtocol) Serialize(packet nnet.IPacket) ([]byte, error) {
	p, yes := packet.(*EchoPacket)
	if !yes {
		fmt.Println("ERROR3:", yes)
		return nil, nnet.ErrReadBlocking // some error
	}
	data, err := json.Marshal(p)
	if err != nil {
		fmt.Println("ERROR4:", err)
		return nil, err
	}
	//TODO compress
	//TODO encrypt
	return data, nil
}