//-----------------------------------------------------------------------------
// Copyright (C) Microsoft. All rights reserved.
// Licensed under the MIT license.
// See LICENSE.txt file in the project root for full license information.
//-----------------------------------------------------------------------------
package main

import (
	"bytes"
	"encoding/binary"
	"net"

	"github.com/nsf/termbox-go"
	"golang.org/x/sys/unix"
)

func getNetDevStats(stats *ethrNetStat) {
	ifs, err := net.Interfaces()
	if err != nil {
		ui.printErr("%v", err)
		return
	}

	for _, iface := range ifs {
		if iface.Flags&net.FlagUp == 0 {
			continue
		}

		ifaceData, err := getIfaceData(iface.Index)
		if err != nil {
			ui.printErr("failed to load data for interface %q: %v", iface.Name, err)
			continue
		}

		stats.netDevStats = append(stats.netDevStats, ethrNetDevStat{
			interfaceName: iface.Name,
			rxBytes:       ifaceData.Data.Ibytes,
			rxPkts:        ifaceData.Data.Ipackets,
			txBytes:       ifaceData.Data.Obytes,
			txPkts:        ifaceData.Data.Opackets,
		})
	}
}

func getTcpStats(stats *ethrNetStat) {
}

func hideCursor() {
	termbox.SetCursor(0, 0)
}

func blockWindowResize() {
}

func getIfaceData(index int) (*ifMsghdr2, error) {
	var data ifMsghdr2
	rawData, err := unix.SysctlRaw("net", unix.AF_ROUTE, 0, 0, unix.NET_RT_IFLIST2, index)
	if err != nil {
		return nil, err
	}
	err = binary.Read(bytes.NewReader(rawData), binary.LittleEndian, &data)
	return &data, err
}

type ifMsghdr2 struct {
	Msglen     uint16
	Version    uint8
	Type       uint8
	Addrs      int32
	Flags      int32
	Index      uint16
	_          [2]byte
	Snd_len    int32
	Snd_maxlen int32
	Snd_drops  int32
	Timer      int32
	Data       ifData64
}

type ifData64 struct {
	Type       uint8
	Typelen    uint8
	Physical   uint8
	Addrlen    uint8
	Hdrlen     uint8
	Recvquota  uint8
	Xmitquota  uint8
	Unused1    uint8
	Mtu        uint32
	Metric     uint32
	Baudrate   uint64
	Ipackets   uint64
	Ierrors    uint64
	Opackets   uint64
	Oerrors    uint64
	Collisions uint64
	Ibytes     uint64
	Obytes     uint64
	Imcasts    uint64
	Omcasts    uint64
	Iqdrops    uint64
	Noproto    uint64
	Recvtiming uint32
	Xmittiming uint32
	Lastchange unix.Timeval32
}