package mmtls

import (
	"bufio"
	"errors"
	"fmt"
	"io"
	"net"
	"strconv"
	"time"

	"xiawan/wx/clientsdk/baseutils"
)

// MMLongConnect 链接MMtls服务器
func MMLongConnect(mmInfo *MMInfo) error {
	strPort := strconv.Itoa(int(mmInfo.LONGPort))
	serverAddr := mmInfo.LongHost + ":" + strPort
	fmt.Println("MMLongConnect serverAddr: ", serverAddr)
	// mminfoDialer := "0"
	// if mmInfo.Dialer != nil {
	// 	mminfoDialer = "1"
	// }
	// 打印 mmInfo.Dialer
	// fmt.Println("MMLongConnect mmInfo.Dialer: ", mminfoDialer)

	// 从MMInfo获取重试参数，如果未设置则使用默认值
	maxRetries := mmInfo.LongConnRetryTimes
	if maxRetries <= 0 {
		maxRetries = 30
	}
	retryInterval := time.Duration(mmInfo.LongConnRetryInterval) * time.Millisecond
	if retryInterval <= 0 {
		retryInterval = 500 * time.Millisecond
	}
	connTimeout := time.Duration(mmInfo.LongConnTimeout) * time.Second
	if connTimeout <= 0 {
		connTimeout = 15 * time.Second
	}

	// 调试：打印 AllowDirectOnProxyFail 的值
	fmt.Printf("MMLongConnect AllowDirectOnProxyFail: %v\n", mmInfo.AllowDirectOnProxyFail)

	// 定义
	var conn net.Conn
	var err error
	proxyFailed := false // 标记代理是否已经失败过

	for i := 0; i < maxRetries; i++ {
		// 如果有代理且代理没有被标记为失败，尝试代理连接
		if mmInfo.Dialer != nil && !proxyFailed {
			// 使用代理连接
			conn, err = mmInfo.Dialer.Dial("tcp4", serverAddr)
			if err != nil {
				baseutils.PrintLog(fmt.Sprintf("MMLongConnect with proxy attempt %d/%d failed: %s", i+1, maxRetries, err.Error()))
				// 检查是否允许降级到直连
				if mmInfo.AllowDirectOnProxyFail {
					baseutils.PrintLog("MMLongConnect: Proxy failed, falling back to direct connection")
					proxyFailed = true // 标记代理失败，后续使用直连
					// 不等待，立即尝试直连
				} else {
					// 不允许直连，等待后重试代理
					time.Sleep(retryInterval)
				}
				continue
			}
			// 设置连接超时
			if err := conn.SetDeadline(time.Now().Add(connTimeout)); err != nil {
				baseutils.PrintLog(fmt.Sprintf("MMLongConnect SetDeadline failed: %s", err.Error()))
				conn.Close()
				time.Sleep(retryInterval)
				continue
			}
			mmInfo.Conn = conn
			mmInfo.reader = bufio.NewReader(conn)
			fmt.Println("MMLongConnect with proxy success!")
			return nil
		}

		// 没有使用代理或代理已失败 - 直连
		conn, err = net.DialTimeout("tcp4", serverAddr, connTimeout)
		if err != nil {
			baseutils.PrintLog(fmt.Sprintf("MMLongConnect direct attempt %d/%d failed: %s", i+1, maxRetries, err.Error()))
			// 等待重试
			time.Sleep(retryInterval)
			continue
		}
		// 设置连接超时
		if err := conn.SetDeadline(time.Now().Add(connTimeout)); err != nil {
			baseutils.PrintLog(fmt.Sprintf("MMLongConnect SetDeadline failed: %s", err.Error()))
			conn.Close()
			time.Sleep(retryInterval)
			continue
		}
		mmInfo.Conn = conn
		mmInfo.reader = bufio.NewReader(conn)
		if proxyFailed {
			fmt.Println("MMLongConnect direct success (after proxy fallback)!")
		} else {
			fmt.Println("MMLongConnect direct success!")
		}
		return nil
	}
	if err != nil {
		return fmt.Errorf("MMLongConnect failed after %d attempts: %w", maxRetries, err)
	}
	return errors.New("MMLongConnect failed: unknown error")
}

// MMTCPSendData MMTCPSendData 长链接发送数据
func MMTCPSendData(mmInfo *MMInfo, data []byte) error {
	// 连接服务器
	if mmInfo.Conn == nil {
		// 提前设置好长链接Host Port
		err := MMLongConnect(mmInfo)
		if err != nil {
			return err
		}
	}

	// 设置写超时
	writeTimeout := time.Duration(mmInfo.LongConnTimeout) * time.Second
	if writeTimeout <= 0 {
		writeTimeout = 15 * time.Second
	}
	if err := mmInfo.Conn.SetWriteDeadline(time.Now().Add(writeTimeout)); err != nil {
		return fmt.Errorf("SetWriteDeadline failed: %w", err)
	}

	// 发送数据
	length, err := mmInfo.Conn.Write(data)
	// 判断是否出错
	if err != nil {
		return fmt.Errorf("write failed: %w", err)
	}
	// 判断数据是否发送完毕
	if length != len(data) {
		return errors.New("MMTCPSendData err: length != len(data)")
	}

	return nil
}

// MMTCPRecvItems 循环接收长链接数据
// Deprecated
func MMTCPRecvItems(mmInfo *MMInfo) ([]*PackItem, error) {
	// 设置读超时
	readTimeout := time.Duration(mmInfo.LongConnReadTimeout) * time.Second
	if readTimeout <= 0 {
		readTimeout = time.Duration(mmInfo.LongConnTimeout) * time.Second
		if readTimeout <= 0 {
			readTimeout = 15 * time.Second
		}
	}
	if err := mmInfo.Conn.SetReadDeadline(time.Now().Add(readTimeout)); err != nil {
		return nil, fmt.Errorf("SetReadDeadline failed: %w", err)
	}

	// 接收返回数据
	recvBuf := make([]byte, 10240)
	recvLen, err := mmInfo.Conn.Read(recvBuf)
	if err != nil {
		return nil, err
	}
	retData := recvBuf[0:recvLen]
	retItems, err := ParserMMtlsResponseData(retData)
	if err != nil {
		return nil, err
	}
	return retItems, nil
}

// MMTCPRecvOneItem
func MMTCPRecvOneItem(mmInfo *MMInfo) (*PackItem, error) {
	if mmInfo == nil || mmInfo.Conn == nil || mmInfo.reader == nil {
		return nil, errors.New("mmInfo.Conn or mmInfo.reader is nil")
	}

	// 设置读超时
	readTimeout := time.Duration(mmInfo.LongConnReadTimeout) * time.Second
	if readTimeout <= 0 {
		readTimeout = time.Duration(mmInfo.LongConnTimeout) * time.Second
		if readTimeout <= 0 {
			readTimeout = 15 * time.Second
		}
	}
	if err := mmInfo.Conn.SetReadDeadline(time.Now().Add(readTimeout)); err != nil {
		return nil, fmt.Errorf("SetReadDeadline failed: %w", err)
	}

	// 读取头部数据
	recordHeadData := make([]byte, 5)
	if _, err := io.ReadFull(mmInfo.reader, recordHeadData); err != nil {
		return nil, fmt.Errorf("read header failed: %w", err)
	}

	// 读取Content
	recordHead := RecordHeadDeSerialize(recordHeadData)
	bodyData := make([]byte, recordHead.Size)

	// 重新设置读超时（针对body）
	if err := mmInfo.Conn.SetReadDeadline(time.Now().Add(readTimeout)); err != nil {
		return nil, fmt.Errorf("SetReadDeadline for body failed: %w", err)
	}

	if _, err := io.ReadFull(mmInfo.reader, bodyData); err != nil {
		return nil, fmt.Errorf("read body failed: %w", err)
	}
	return &PackItem{
		RecordHead: recordHeadData,
		PackData:   bodyData,
	}, nil
}

// MMTCPSendReq 长链接发送请求
func MMTCPSendReq(mmInfo *MMInfo, opCode uint32, data []byte) error {
	sendData, err := MMLongPackData(mmInfo, opCode, data)
	if err != nil {
		return err
	}
	// 发送数据
	err = MMTCPSendData(mmInfo, sendData)
	if err != nil {
		return err
	}

	return nil
}

// MMTCPRecvData 接受MMTLS信息
func MMTCPRecvData(mmInfo *MMInfo) (*LongRecvInfo, error) {
	// 接收响应数据
	recvItem, err := MMTCPRecvOneItem(mmInfo)
	if err != nil {
		fmt.Println("MMTCPRecvData err", err.Error())
		// log.("接收mmtls长链接响应失败", err.Error())
		return nil, err
	}

	// 解包响应数据
	recvInfo, err := MMLongUnPackData(mmInfo, recvItem)
	if err != nil {
		fmt.Println("MMTCPRecvData err", err.Error())
		//log.Info("解包响应数据失败", err.Error())
		return nil, err
	}

	return recvInfo, nil
}