package fsm

import (
	"bytes"
	"os"
	"reflect"
	"testing"
	"time"

	"github.com/hashicorp/consul/agent/consul/autopilot"
	"github.com/hashicorp/consul/agent/consul/state"
	"github.com/hashicorp/consul/agent/structs"
	"github.com/hashicorp/consul/api"
	"github.com/hashicorp/consul/lib"
	"github.com/pascaldekloe/goe/verify"
)

func TestFSM_SnapshotRestore_OSS(t *testing.T) {
	t.Parallel()
	fsm, err := New(nil, os.Stderr)
	if err != nil {
		t.Fatalf("err: %v", err)
	}

	// Add some state
	fsm.state.EnsureNode(1, &structs.Node{Node: "foo", Address: "127.0.0.1"})
	fsm.state.EnsureNode(2, &structs.Node{Node: "baz", Address: "127.0.0.2", TaggedAddresses: map[string]string{"hello": "1.2.3.4"}})
	fsm.state.EnsureService(3, "foo", &structs.NodeService{ID: "web", Service: "web", Tags: nil, Address: "127.0.0.1", Port: 80})
	fsm.state.EnsureService(4, "foo", &structs.NodeService{ID: "db", Service: "db", Tags: []string{"primary"}, Address: "127.0.0.1", Port: 5000})
	fsm.state.EnsureService(5, "baz", &structs.NodeService{ID: "web", Service: "web", Tags: nil, Address: "127.0.0.2", Port: 80})
	fsm.state.EnsureService(6, "baz", &structs.NodeService{ID: "db", Service: "db", Tags: []string{"secondary"}, Address: "127.0.0.2", Port: 5000})
	fsm.state.EnsureCheck(7, &structs.HealthCheck{
		Node:      "foo",
		CheckID:   "web",
		Name:      "web connectivity",
		Status:    api.HealthPassing,
		ServiceID: "web",
	})
	fsm.state.KVSSet(8, &structs.DirEntry{
		Key:   "/test",
		Value: []byte("foo"),
	})
	session := &structs.Session{ID: generateUUID(), Node: "foo"}
	fsm.state.SessionCreate(9, session)
	acl := &structs.ACL{ID: generateUUID(), Name: "User Token"}
	fsm.state.ACLSet(10, acl)
	if _, err := fsm.state.ACLBootstrapInit(10); err != nil {
		t.Fatalf("err: %v", err)
	}

	fsm.state.KVSSet(11, &structs.DirEntry{
		Key:   "/remove",
		Value: []byte("foo"),
	})
	fsm.state.KVSDelete(12, "/remove")
	idx, _, err := fsm.state.KVSList(nil, "/remove")
	if err != nil {
		t.Fatalf("err: %s", err)
	}
	if idx != 12 {
		t.Fatalf("bad index: %d", idx)
	}

	updates := structs.Coordinates{
		&structs.Coordinate{
			Node:  "baz",
			Coord: generateRandomCoordinate(),
		},
		&structs.Coordinate{
			Node:  "foo",
			Coord: generateRandomCoordinate(),
		},
	}
	if err := fsm.state.CoordinateBatchUpdate(13, updates); err != nil {
		t.Fatalf("err: %s", err)
	}

	query := structs.PreparedQuery{
		ID: generateUUID(),
		Service: structs.ServiceQuery{
			Service: "web",
		},
		RaftIndex: structs.RaftIndex{
			CreateIndex: 14,
			ModifyIndex: 14,
		},
	}
	if err := fsm.state.PreparedQuerySet(14, &query); err != nil {
		t.Fatalf("err: %s", err)
	}

	autopilotConf := &autopilot.Config{
		CleanupDeadServers:   true,
		LastContactThreshold: 100 * time.Millisecond,
		MaxTrailingLogs:      222,
	}
	if err := fsm.state.AutopilotSetConfig(15, autopilotConf); err != nil {
		t.Fatalf("err: %s", err)
	}

	// Snapshot
	snap, err := fsm.Snapshot()
	if err != nil {
		t.Fatalf("err: %v", err)
	}
	defer snap.Release()

	// Persist
	buf := bytes.NewBuffer(nil)
	sink := &MockSink{buf, false}
	if err := snap.Persist(sink); err != nil {
		t.Fatalf("err: %v", err)
	}

	// Try to restore on a new FSM
	fsm2, err := New(nil, os.Stderr)
	if err != nil {
		t.Fatalf("err: %v", err)
	}

	// Do a restore
	if err := fsm2.Restore(sink); err != nil {
		t.Fatalf("err: %v", err)
	}

	// Verify the contents
	_, nodes, err := fsm2.state.Nodes(nil)
	if err != nil {
		t.Fatalf("err: %s", err)
	}
	if len(nodes) != 2 {
		t.Fatalf("bad: %v", nodes)
	}
	if nodes[0].Node != "baz" ||
		nodes[0].Address != "127.0.0.2" ||
		len(nodes[0].TaggedAddresses) != 1 ||
		nodes[0].TaggedAddresses["hello"] != "1.2.3.4" {
		t.Fatalf("bad: %v", nodes[0])
	}
	if nodes[1].Node != "foo" ||
		nodes[1].Address != "127.0.0.1" ||
		len(nodes[1].TaggedAddresses) != 0 {
		t.Fatalf("bad: %v", nodes[1])
	}

	_, fooSrv, err := fsm2.state.NodeServices(nil, "foo")
	if err != nil {
		t.Fatalf("err: %s", err)
	}
	if len(fooSrv.Services) != 2 {
		t.Fatalf("Bad: %v", fooSrv)
	}
	if !lib.StrContains(fooSrv.Services["db"].Tags, "primary") {
		t.Fatalf("Bad: %v", fooSrv)
	}
	if fooSrv.Services["db"].Port != 5000 {
		t.Fatalf("Bad: %v", fooSrv)
	}

	_, checks, err := fsm2.state.NodeChecks(nil, "foo")
	if err != nil {
		t.Fatalf("err: %s", err)
	}
	if len(checks) != 1 {
		t.Fatalf("Bad: %v", checks)
	}

	// Verify key is set
	_, d, err := fsm2.state.KVSGet(nil, "/test")
	if err != nil {
		t.Fatalf("err: %v", err)
	}
	if string(d.Value) != "foo" {
		t.Fatalf("bad: %v", d)
	}

	// Verify session is restored
	idx, s, err := fsm2.state.SessionGet(nil, session.ID)
	if err != nil {
		t.Fatalf("err: %v", err)
	}
	if s.Node != "foo" {
		t.Fatalf("bad: %v", s)
	}
	if idx <= 1 {
		t.Fatalf("bad index: %d", idx)
	}

	// Verify ACL is restored
	_, a, err := fsm2.state.ACLGet(nil, acl.ID)
	if err != nil {
		t.Fatalf("err: %v", err)
	}
	if a.Name != "User Token" {
		t.Fatalf("bad: %v", a)
	}
	if a.ModifyIndex <= 1 {
		t.Fatalf("bad index: %d", idx)
	}
	gotB, err := fsm2.state.ACLGetBootstrap()
	if err != nil {
		t.Fatalf("err: %v", err)
	}
	wantB := &structs.ACLBootstrap{
		AllowBootstrap: true,
		RaftIndex: structs.RaftIndex{
			CreateIndex: 10,
			ModifyIndex: 10,
		},
	}
	verify.Values(t, "", gotB, wantB)

	// Verify tombstones are restored
	func() {
		snap := fsm2.state.Snapshot()
		defer snap.Close()
		stones, err := snap.Tombstones()
		if err != nil {
			t.Fatalf("err: %s", err)
		}
		stone := stones.Next().(*state.Tombstone)
		if stone == nil {
			t.Fatalf("missing tombstone")
		}
		if stone.Key != "/remove" || stone.Index != 12 {
			t.Fatalf("bad: %v", stone)
		}
		if stones.Next() != nil {
			t.Fatalf("unexpected extra tombstones")
		}
	}()

	// Verify coordinates are restored
	_, coords, err := fsm2.state.Coordinates(nil)
	if err != nil {
		t.Fatalf("err: %s", err)
	}
	if !reflect.DeepEqual(coords, updates) {
		t.Fatalf("bad: %#v", coords)
	}

	// Verify queries are restored.
	_, queries, err := fsm2.state.PreparedQueryList(nil)
	if err != nil {
		t.Fatalf("err: %s", err)
	}
	if len(queries) != 1 {
		t.Fatalf("bad: %#v", queries)
	}
	if !reflect.DeepEqual(queries[0], &query) {
		t.Fatalf("bad: %#v", queries[0])
	}

	// Verify autopilot config is restored.
	_, restoredConf, err := fsm2.state.AutopilotConfig()
	if err != nil {
		t.Fatalf("err: %s", err)
	}
	if !reflect.DeepEqual(restoredConf, autopilotConf) {
		t.Fatalf("bad: %#v, %#v", restoredConf, autopilotConf)
	}

	// Snapshot
	snap, err = fsm2.Snapshot()
	if err != nil {
		t.Fatalf("err: %v", err)
	}
	defer snap.Release()

	// Persist
	buf = bytes.NewBuffer(nil)
	sink = &MockSink{buf, false}
	if err := snap.Persist(sink); err != nil {
		t.Fatalf("err: %v", err)
	}

	// Try to restore on the old FSM and make sure it abandons the old state
	// store.
	abandonCh := fsm.state.AbandonCh()
	if err := fsm.Restore(sink); err != nil {
		t.Fatalf("err: %v", err)
	}
	select {
	case <-abandonCh:
	default:
		t.Fatalf("bad")
	}
}

func TestFSM_BadRestore_OSS(t *testing.T) {
	t.Parallel()
	// Create an FSM with some state.
	fsm, err := New(nil, os.Stderr)
	if err != nil {
		t.Fatalf("err: %v", err)
	}
	fsm.state.EnsureNode(1, &structs.Node{Node: "foo", Address: "127.0.0.1"})
	abandonCh := fsm.state.AbandonCh()

	// Do a bad restore.
	buf := bytes.NewBuffer([]byte("bad snapshot"))
	sink := &MockSink{buf, false}
	if err := fsm.Restore(sink); err == nil {
		t.Fatalf("err: %v", err)
	}

	// Verify the contents didn't get corrupted.
	_, nodes, err := fsm.state.Nodes(nil)
	if err != nil {
		t.Fatalf("err: %s", err)
	}
	if len(nodes) != 1 {
		t.Fatalf("bad: %v", nodes)
	}
	if nodes[0].Node != "foo" ||
		nodes[0].Address != "127.0.0.1" ||
		len(nodes[0].TaggedAddresses) != 0 {
		t.Fatalf("bad: %v", nodes[0])
	}

	// Verify the old state store didn't get abandoned.
	select {
	case <-abandonCh:
		t.Fatalf("bad")
	default:
	}
}