package dynamicrouting

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

func TestOSPFStatusIsPerInstance(t *testing.T) {
	dir := t.TempDir()
	text := "#!/bin/sh\nprintf 'ospf_a OSPF master4 up 00:00\\nospf_b OSPF master4 down 00:00\\n'\n"
	if err := os.WriteFile(filepath.Join(dir, "birdc"), []byte(text), 0755); err != nil {
		t.Fatal(err)
	}
	t.Setenv("PATH", dir+":"+os.Getenv("PATH"))
	m := &Manager{}
	m.config.OSPFInstances = []OSPFInstance{{Name: "a"}, {Name: "b"}, {Name: "c"}}
	got := m.ListOSPFInstances()
	if !got[0].Running || got[1].Running || got[2].Running {
		t.Fatal("one OSPF instance marked other instances running", got)
	}
}

func TestOSPFBirdConfigGeneration(t *testing.T) {
	m := &Manager{}
	m.config.OSPFInstances = []OSPFInstance{
		{
			ID:                    "inst-1",
			Name:                  "core",
			Version:               2,
			VRF:                   "vrf-mgmt",
			RoutingTable:          "t100",
			RouterID:              "10.255.0.1",
			Enabled:               true,
			RedistributeConnected: true,
			RedistributeStatic:    false, // Must NOT export RTS_STATIC
			RedistributeBGP:       true,
			DefaultMetric:         55,
		},
	}
	m.config.OSPFAreas = []OSPFArea{
		{
			ID:          "area-1",
			Name:        "stub-area",
			Instance:    "core",
			AreaID:      "0.0.0.10",
			AreaType:    "stub",
			DefaultCost: 25,
			NoSummaries: true,
		},
	}
	m.config.OSPFAreaRanges = []OSPFAreaRange{
		{
			ID:        "range-1",
			Area:      "stub-area",
			Prefix:    "10.10.0.0/16",
			Cost:      10,
			Advertise: false, // Must emit hidden;
		},
		{
			ID:        "range-2",
			Area:      "stub-area",
			Prefix:    "10.20.0.0/16",
			Cost:      5,
			Advertise: true,
		},
	}
	m.config.OSPFInterfaces = []OSPFInterface{
		{
			ID:          "iface-1",
			Interfaces:  "eth0, eth1",
			Area:        "stub-area",
			Networks:    "10.10.1.0/24",
			NetworkType: "nonbroadcast",
			Cost:        15,
			Priority:    64,
			Auth:        "md5",
			AuthKey:     "secretpass",
		},
	}
	m.config.OSPFStaticNbrs = []OSPFStaticNeighbor{
		{
			ID:           "snbr-1",
			Address:      "10.10.1.5",
			Area:         "stub-area",
			PollInterval: 30,
			Cost:         15,
		},
		{
			ID:           "snbr-2",
			Address:      "192.168.99.1",
			Area:         "stub-area",
			PollInterval: 45,
			Cost:         20,
		},
	}

	conf := m.generateBirdConfig()

	// 1. Verify instance settings
	if !strings.Contains(conf, "protocol ospf v2 ospf_core {") {
		t.Fatalf("missing protocol ospf v2 ospf_core in config:\n%s", conf)
	}
	if !strings.Contains(conf, "vrf vrf-mgmt;") {
		t.Fatalf("missing vrf vrf-mgmt in config:\n%s", conf)
	}
	if !strings.Contains(conf, "router id 10.255.0.1;") {
		t.Fatalf("missing router id 10.255.0.1 in config:\n%s", conf)
	}
	if !strings.Contains(conf, "table t100;") {
		t.Fatalf("missing table t100 in config:\n%s", conf)
	}

	// 2. Verify redistribution & default metric
	ospfBlock := conf[strings.Index(conf, "protocol ospf v2 ospf_core"):]
	if strings.Contains(ospfBlock, "RTS_STATIC") {
		t.Fatalf("RTS_STATIC exported even though RedistributeStatic is false:\n%s", ospfBlock)
	}
	if !strings.Contains(ospfBlock, "RTS_DEVICE, RTS_BGP") {
		t.Fatalf("expected RTS_DEVICE, RTS_BGP in export filter:\n%s", ospfBlock)
	}
	if !strings.Contains(ospfBlock, "ospf_metric1 = 55;") {
		t.Fatalf("missing ospf_metric1 = 55; in export filter:\n%s", ospfBlock)
	}

	// 3. Verify area options: stub, default cost, summary no
	if !strings.Contains(conf, "area 0.0.0.10 {") {
		t.Fatalf("missing area 0.0.0.10 in config:\n%s", conf)
	}
	if !strings.Contains(conf, "stub;") {
		t.Fatalf("missing stub; in area:\n%s", conf)
	}
	if !strings.Contains(conf, "default cost 25;") {
		t.Fatalf("missing default cost 25; in area:\n%s", conf)
	}
	if !strings.Contains(conf, "summary no;") {
		t.Fatalf("missing summary no; in area:\n%s", conf)
	}

	// 4. Verify area range advertising: hidden; for advertise=false
	if !strings.Contains(conf, "stubnet 10.10.0.0/16 { cost 10; hidden; };") {
		t.Fatalf("missing stubnet 10.10.0.0/16 { cost 10; hidden; }; in config:\n%s", conf)
	}
	if !strings.Contains(conf, "stubnet 10.20.0.0/16 { cost 5; };") {
		t.Fatalf("missing stubnet 10.20.0.0/16 { cost 5; }; in config:\n%s", conf)
	}

	// 5. Verify interface template formatting: comma separated interfaces
	if !strings.Contains(conf, "interface \"eth0\", \"eth1\", 10.10.1.0/24 {") {
		t.Fatalf("missing interface \"eth0\", \"eth1\", 10.10.1.0/24 { in config:\n%s", conf)
	}
	if !strings.Contains(conf, "type nonbroadcast;") {
		t.Fatalf("missing type nonbroadcast; in config:\n%s", conf)
	}
	if !strings.Contains(conf, "cost 15;") {
		t.Fatalf("missing cost 15; in config:\n%s", conf)
	}
	if !strings.Contains(conf, "priority 64;") {
		t.Fatalf("missing priority 64; in config:\n%s", conf)
	}
	if !strings.Contains(conf, "authentication cryptographic;\n            password \"secretpass\";") {
		t.Fatalf("missing authentication cryptographic and password in config:\n%s", conf)
	}

	// 6. Verify static neighbor attached to matching interface template
	if !strings.Contains(conf, "10.10.1.5;") {
		t.Fatalf("missing static neighbor 10.10.1.5 in config:\n%s", conf)
	}

	// 7. Verify remaining static neighbor in fallback interface "*"
	if !strings.Contains(conf, "192.168.99.1;") {
		t.Fatalf("missing static neighbor 192.168.99.1 in config:\n%s", conf)
	}
}

func TestOSPFStaticNeighborManagement(t *testing.T) {
	m := &Manager{}
	snbr := OSPFStaticNeighbor{
		Address:      "10.0.0.2",
		Area:         "Default",
		PollInterval: 60,
		Cost:         5,
	}

	if err := m.SaveOSPFStaticNeighbor(snbr); err != nil {
		// applyBirdConfig may fail if bird is not running in test env, but config must be in memory
		t.Logf("Save returned error (expected in mock env): %v", err)
	}

	list := m.ListOSPFStaticNeighbors()
	if len(list) != 1 || list[0].Address != "10.0.0.2" {
		t.Fatalf("expected 1 static neighbor with address 10.0.0.2, got: %+v", list)
	}

	id := list[0].ID
	_ = m.SetOSPFStaticNeighborState(id, true)
	list2 := m.ListOSPFStaticNeighbors()
	if !list2[0].Disabled {
		t.Fatalf("expected neighbor to be disabled, got: %+v", list2[0])
	}

	_ = m.DeleteOSPFStaticNeighbor(id)
	list3 := m.ListOSPFStaticNeighbors()
	if len(list3) != 0 {
		t.Fatalf("expected 0 static neighbors after delete, got: %+v", list3)
	}
}