package monitor

import (
	"sort"

	"github.com/shirou/gopsutil/v3/net"
)

// NetInfo 网卡信息（gopsutil net.InterfaceStat）
type NetInfo struct {
	Name             string `json:"name"`             // interface name
	BytesSent        uint64 `json:"bytesSent"`        // number of bytes sent
	BytesRecv        uint64 `json:"bytesRecv"`        // number of bytes received
	PacketsSent      uint64 `json:"packetsSent"`      // number of packets sent
	PacketsRecv      uint64 `json:"packetsRecv"`      // number of packets received
	TotalBytesSent   uint64 `json:"totalBytesSent"`   // number of bytes sent
	TotalBytesRecv   uint64 `json:"totalBytesRecv"`   // number of bytes received
	TotalPacketsSent uint64 `json:"totalPacketsSent"` // number of packets sent
	TotalPacketsRecv uint64 `json:"totalPacketsRecv"` // number of packets received
}

// NetInfoLite 精简版网卡信息
type NetInfoLite struct {
	BytesSent      uint64 `json:"bytesSent"`      // number of bytes sent
	BytesRecv      uint64 `json:"bytesRecv"`      // number of bytes received
	PacketsSent    uint64 `json:"packetsSent"`    // number of packets sent
	PacketsRecv    uint64 `json:"packetsRecv"`    // number of packets received
	TotalBytesSent uint64 `json:"totalBytesSent"` // number of bytes sent
	TotalBytesRecv uint64 `json:"totalBytesRecv"` // number of bytes received
}

// Addr 网卡地址
type Addr struct {
	Ip   string `json:"ip"`
	Port uint32 `json:"port"`
}

// ConnInfo 连接汇总：TCP/UDP 计数、监听端口列表与每进程连接计数
type ConnInfo struct {
	Fd         uint32 `json:"fd"`
	Family     uint32 `json:"family"`
	Type       uint32 `json:"type"`
	LocalAddr  Addr   `json:"localAddr"`
	RemoteAddr Addr   `json:"remoteAddr"`
	Status     string `json:"status"`
	Pid        int32  `json:"pid"`
}

// NetListen 监听端口详情
type NetListen struct {
	Addr string `json:"addr"`
	Port uint32 `json:"port"`
	Conn int    `json:"conn"`
	ConnInfo
}

// ProcConn 每进程连接计数
type ProcConn struct {
	Pid  int    `json:"pid"`
	Name string `json:"name"`
	Conn int    `json:"conn"`
}

// NetConnInfo 单条网络连接信息（gopsutil net.ConnectionStat）
type NetConnInfo struct {
	Tcp    int         `json:"tcp"`
	Udp    int         `json:"udp"`
	Listen []NetListen `json:"listen"`
}

// getNetInfo 采集网卡列表
func getNetInfo() ([]NetInfo, error) {

	netIo, err := net.IOCounters(true)
	if err != nil {
		return nil, err
	}
	nets := make([]NetInfo, len(netIo))
	for i, v := range netIo {
		nets[i].Name = netIo[i].Name
		nets[i].TotalBytesSent = v.BytesSent
		nets[i].TotalBytesRecv = v.BytesRecv
		nets[i].TotalPacketsSent = v.PacketsSent
		nets[i].TotalPacketsRecv = v.PacketsRecv

		// 应该使用网卡名 未处理
		if len(monInfo.Net) > i {
			nets[i].BytesSent = v.BytesSent - monInfo.Net[i].TotalBytesSent
			nets[i].BytesRecv = v.BytesRecv - monInfo.Net[i].TotalBytesRecv
			nets[i].PacketsSent = v.PacketsSent - monInfo.Net[i].TotalPacketsSent
			nets[i].PacketsRecv = v.PacketsRecv - monInfo.Net[i].TotalPacketsRecv
		}
	}
	return nets, err
}

// getNetConnInfo 采集 TCP/UDP 连接计数与监听端口汇总
func getNetConnInfo() (NetConnInfo, error) {

	// linux TcpStatus
	/* 	{
		"01": "ESTABLISHED",
		"02": "SYN_SENT",
		"03": "SYN_RECV",
		"04": "FIN_WAIT1",
		"05": "FIN_WAIT2",
		"06": "TIME_WAIT",
		"07": "CLOSE",
		"08": "CLOSE_WAIT",
		"09": "LAST_ACK",
		"0A": "LISTEN",
		"0B": "CLOSING",
	} */

	// windows TcpStatus
	/* 	{
		1:  "CLOSED",
		2:  "LISTEN",
		3:  "SYN_SENT",
		4:  "SYN_RECEIVED",
		5:  "ESTABLISHED",
		6:  "FIN_WAIT_1",
		7:  "FIN_WAIT_2",
		8:  "CLOSE_WAIT",
		9:  "CLOSING",
		10: "LAST_ACK",
		11: "TIME_WAIT",
		12: "DELETE",
	} */

	/* {
		"all":   {kindTCP4, kindTCP6, kindUDP4, kindUDP6},
		"tcp":   {kindTCP4, kindTCP6},
		"tcp4":  {kindTCP4},
		"tcp6":  {kindTCP6},
		"udp":   {kindUDP4, kindUDP6},
		"udp4":  {kindUDP4},
		"udp6":  {kindUDP6},
		"inet":  {kindTCP4, kindTCP6, kindUDP4, kindUDP6},
		"inet4": {kindTCP4, kindUDP4},
		"inet6": {kindTCP6, kindUDP6},
	} */

	info := NetConnInfo{}
	tcp, err := net.Connections("tcp")
	if err != nil {
		return info, nil
	}
	udp, err := net.Connections("udp")
	if err != nil {
		return info, nil
	}

	//logger.Infof("net conn tcp:%d udp:%d", info.Tcp, info.Udp)

	// 监听列表
	listen := make([]NetListen, 0)
	for _, v := range tcp {
		if v.Status == "LISTEN" {
			inPort := false
			for _, l := range listen {
				if l.Port == v.Laddr.Port {
					inPort = true
					break
				}
			}
			if !inPort {
				listen = append(listen, NetListen{
					Addr: v.Laddr.IP,
					Port: v.Laddr.Port,
					Conn: 0,
					ConnInfo: ConnInfo{
						Fd:     v.Fd,
						Family: v.Family,
						Type:   v.Type,
						LocalAddr: Addr{
							Ip:   v.Laddr.IP,
							Port: v.Laddr.Port,
						},
						RemoteAddr: Addr{
							Ip:   v.Raddr.IP,
							Port: v.Raddr.Port,
						},
						Status: v.Status,
						Pid:    v.Pid,
					},
				})
			}
		}
	}

	// 连接计数
	count := 0
	for _, v := range tcp {
		if v.Status == "ESTABLISHED" {
			for index, l := range listen {
				if l.Port == v.Laddr.Port {
					listen[index].Conn++
					break
				}
			}
			count++
		}
	}

	//排序
	sort.Slice(listen, func(i, j int) bool {
		return listen[i].Conn > listen[j].Conn
	})

	// TCP和UDP连接数
	info.Tcp = count //len(tcp)
	info.Udp = len(udp)

	info.Listen = listen
	return info, nil
}