package main

import (
	"os"
	"path/filepath"
	"testing"
)

func TestReadNetworkSnapshot(t *testing.T) {
	path := filepath.Join(t.TempDir(), "netdev")
	content := `Inter-| Receive | Transmit
 face |bytes packets errs drop fifo frame compressed multicast|bytes packets errs drop fifo colls carrier compressed
    lo: 100 1 0 0 0 0 0 0 100 1 0 0 0 0 0 0
  eth0: 1200 2 0 0 0 0 0 0 3400 3 0 0 0 0 0 0
 vmbr0: 5600 4 0 0 0 0 0 0 7800 5 0 0 0 0 0 0
`
	if err := os.WriteFile(path, []byte(content), 0o600); err != nil {
		t.Fatal(err)
	}

	snapshot, interfaces, details, err := readNetworkSnapshot(path)
	if err != nil {
		t.Fatal(err)
	}
	if snapshot.received != 6800 || snapshot.sent != 11200 {
		t.Fatalf("неожиданные сетевые счётчики: %+v", snapshot)
	}
	if len(interfaces) != 2 {
		t.Fatalf("неожиданный список интерфейсов: %v", interfaces)
	}
	if len(details) != 2 {
		t.Fatalf("unexpected interface details: %+v", details)
	}
}

func TestInterfaceVMID(t *testing.T) {
	for name, want := range map[string]int{"tap100i0": 100, "veth108i0": 108, "fwbr113i0": 113, "vmbr0": 0, "enp6s0": 0} {
		if got := interfaceVMID(name); got != want {
			t.Fatalf("%s: got %d want %d", name, got, want)
		}
	}
}