package dynamicrouting

import (
	"encoding/json"
	"os"
	"path/filepath"
	"strings"
	"testing"
)

func TestBFDSaveFailureRestoresMemory(t *testing.T) {
	root := t.TempDir()
	bad := filepath.Join(root, "directory")
	if err := os.Mkdir(bad, 0700); err != nil {
		t.Fatal(err)
	}
	old := BFDNeighbor{ID: "peer", Address: "192.0.2.1", Disabled: true}
	m := &Manager{configPath: bad, config: DynamicConfig{BFDNeighbors: []BFDNeighbor{old}}}
	_, err := m.SaveBFDNeighbor(BFDNeighbor{ID: "peer", Address: old.Address, Disabled: false})
	if err == nil {
		t.Fatal("expected failure")
	}
	if got := m.ListBFDNeighbors(); len(got) != 1 || !got[0].Disabled {
		t.Fatalf("configuration changed: %+v", got)
	}
}
func TestBFDApplyFailureRestoresConfig(t *testing.T) {
	root := t.TempDir()
	birdDir := filepath.Join(root, "bird.conf.new")
	if err := os.Mkdir(birdDir, 0700); err != nil {
		t.Fatal(err)
	}
	old := BFDNeighbor{ID: "peer", Address: "192.0.2.1", Disabled: true}
	path := filepath.Join(root, "dynamic.json")
	m := &Manager{configPath: path, birdConfigPath: filepath.Join(root, "bird.conf"), config: DynamicConfig{BFDNeighbors: []BFDNeighbor{old}}}
	if err := m.save(); err != nil {
		t.Fatal(err)
	}
	_, err := m.SaveBFDNeighbor(BFDNeighbor{ID: "peer", Address: old.Address, Disabled: false})
	if err == nil || !strings.Contains(err.Error(), "apply BFD") {
		t.Fatalf("unexpected: %v", err)
	}
	var saved DynamicConfig
	data, err := os.ReadFile(path)
	if err != nil {
		t.Fatal(err)
	}
	if err = json.Unmarshal(data, &saved); err != nil {
		t.Fatal(err)
	}
	if len(saved.BFDNeighbors) != 1 || !saved.BFDNeighbors[0].Disabled || !m.ListBFDNeighbors()[0].Disabled {
		t.Fatalf("configuration not restored: %+v", saved.BFDNeighbors)
	}
}

func TestActiveEIGRPRequiresVtysh(t *testing.T) {
	t.Setenv("PATH", t.TempDir())
	m := &Manager{config: DynamicConfig{EIGRPInstances: []EIGRPInstance{{Name: "test", Disabled: false}}}}
	if err := m.applyFRREigrpConfig(); err == nil || !strings.Contains(err.Error(), "vtysh") {
		t.Fatalf("expected vtysh error, got %v", err)
	}
	m.config.EIGRPInstances[0].Disabled = true
	if err := m.applyFRREigrpConfig(); err != nil {
		t.Fatalf("inactive EIGRP: %v", err)
	}
}