package audit

import (
	"context"
	"encoding/json"
	"testing"

	"github.com/felt-app/felt/internal/store"
)

// mockPublisher records published audit events for testing.
type mockPublisher struct {
	published []struct {
		TournamentID string
		Data         []byte
	}
}

func (m *mockPublisher) PublishAudit(ctx context.Context, tournamentID string, data []byte) error {
	m.published = append(m.published, struct {
		TournamentID string
		Data         []byte
	}{tournamentID, data})
	return nil
}

func setupTestTrail(t *testing.T) (*Trail, *mockPublisher) {
	t.Helper()
	tmpDir := t.TempDir()

	db, err := store.Open(tmpDir, true)
	if err != nil {
		t.Fatalf("open database: %v", err)
	}
	t.Cleanup(func() { db.Close() })

	pub := &mockPublisher{}
	trail := NewTrail(db.DB, pub)

	return trail, pub
}

func TestRecordAuditEntry(t *testing.T) {
	trail, _ := setupTestTrail(t)
	ctx := context.Background()

	tournamentID := "550e8400-e29b-41d4-a716-446655440000"
	entry := AuditEntry{
		TournamentID:  &tournamentID,
		OperatorID:    "op-1",
		Action:        ActionPlayerBuyin,
		TargetType:    "player",
		TargetID:      "player-1",
		PreviousState: json.RawMessage(`{"chips":0}`),
		NewState:      json.RawMessage(`{"chips":10000}`),
	}

	recorded, err := trail.Record(ctx, entry)
	if err != nil {
		t.Fatalf("record entry: %v", err)
	}

	if recorded.ID == "" {
		t.Fatal("expected generated ID")
	}
	if recorded.Timestamp == 0 {
		t.Fatal("expected generated timestamp")
	}
	if recorded.Action != ActionPlayerBuyin {
		t.Fatalf("expected action %s, got %s", ActionPlayerBuyin, recorded.Action)
	}
}

func TestRecordPersistsToDatabase(t *testing.T) {
	trail, _ := setupTestTrail(t)
	ctx := context.Background()

	tournamentID := "550e8400-e29b-41d4-a716-446655440001"
	entry := AuditEntry{
		TournamentID:  &tournamentID,
		OperatorID:    "op-1",
		Action:        ActionPlayerBust,
		TargetType:    "player",
		TargetID:      "player-2",
		PreviousState: json.RawMessage(`{"status":"active","chips":5000}`),
		NewState:      json.RawMessage(`{"status":"busted","chips":0}`),
	}

	recorded, err := trail.Record(ctx, entry)
	if err != nil {
		t.Fatalf("record entry: %v", err)
	}

	// Retrieve and verify
	fetched, err := trail.GetEntry(ctx, recorded.ID)
	if err != nil {
		t.Fatalf("get entry: %v", err)
	}

	if fetched.Action != ActionPlayerBust {
		t.Fatalf("expected action %s, got %s", ActionPlayerBust, fetched.Action)
	}
	if fetched.OperatorID != "op-1" {
		t.Fatalf("expected operator_id op-1, got %s", fetched.OperatorID)
	}
	if fetched.TargetType != "player" {
		t.Fatalf("expected target_type player, got %s", fetched.TargetType)
	}
	if fetched.TargetID != "player-2" {
		t.Fatalf("expected target_id player-2, got %s", fetched.TargetID)
	}
	if string(fetched.PreviousState) != `{"status":"active","chips":5000}` {
		t.Fatalf("unexpected previous_state: %s", fetched.PreviousState)
	}
	if string(fetched.NewState) != `{"status":"busted","chips":0}` {
		t.Fatalf("unexpected new_state: %s", fetched.NewState)
	}
}

func TestRecordPublishesToNATS(t *testing.T) {
	trail, pub := setupTestTrail(t)
	ctx := context.Background()

	tournamentID := "550e8400-e29b-41d4-a716-446655440002"
	entry := AuditEntry{
		TournamentID: &tournamentID,
		OperatorID:   "op-1",
		Action:       ActionClockStart,
		TargetType:   "tournament",
		TargetID:     tournamentID,
	}

	_, err := trail.Record(ctx, entry)
	if err != nil {
		t.Fatalf("record entry: %v", err)
	}

	if len(pub.published) != 1 {
		t.Fatalf("expected 1 published message, got %d", len(pub.published))
	}
	if pub.published[0].TournamentID != tournamentID {
		t.Fatalf("expected tournament ID %s, got %s", tournamentID, pub.published[0].TournamentID)
	}

	// Verify the published data is valid JSON
	var publishedEntry AuditEntry
	if err := json.Unmarshal(pub.published[0].Data, &publishedEntry); err != nil {
		t.Fatalf("unmarshal published data: %v", err)
	}
	if publishedEntry.Action != ActionClockStart {
		t.Fatalf("expected action %s in NATS message, got %s", ActionClockStart, publishedEntry.Action)
	}
}

func TestRecordWithoutTournamentIDSkipsNATS(t *testing.T) {
	trail, pub := setupTestTrail(t)
	ctx := context.Background()

	// Venue-level action (no tournament ID)
	entry := AuditEntry{
		OperatorID: "op-1",
		Action:     ActionOperatorLogin,
		TargetType: "operator",
		TargetID:   "op-1",
	}

	_, err := trail.Record(ctx, entry)
	if err != nil {
		t.Fatalf("record entry: %v", err)
	}

	if len(pub.published) != 0 {
		t.Fatalf("expected no published messages for venue-level action, got %d", len(pub.published))
	}
}

func TestRecordRequiresAction(t *testing.T) {
	trail, _ := setupTestTrail(t)
	ctx := context.Background()

	entry := AuditEntry{
		OperatorID: "op-1",
		TargetType: "player",
		TargetID:   "player-1",
	}

	_, err := trail.Record(ctx, entry)
	if err == nil {
		t.Fatal("expected error for missing action")
	}
}

func TestRecordDefaultsOperatorToSystem(t *testing.T) {
	trail, _ := setupTestTrail(t)
	ctx := context.Background()

	entry := AuditEntry{
		Action:     ActionTournamentCreate,
		TargetType: "tournament",
		TargetID:   "t-1",
	}

	recorded, err := trail.Record(ctx, entry)
	if err != nil {
		t.Fatalf("record entry: %v", err)
	}

	if recorded.OperatorID != "system" {
		t.Fatalf("expected operator_id 'system', got %s", recorded.OperatorID)
	}
}

func TestGetEntries(t *testing.T) {
	trail, _ := setupTestTrail(t)
	ctx := context.Background()

	tournamentID := "550e8400-e29b-41d4-a716-446655440003"

	// Record multiple entries
	for i := 0; i < 5; i++ {
		_, err := trail.Record(ctx, AuditEntry{
			TournamentID: &tournamentID,
			OperatorID:   "op-1",
			Action:       ActionPlayerBuyin,
			TargetType:   "player",
			TargetID:     "player-1",
		})
		if err != nil {
			t.Fatalf("record entry %d: %v", i, err)
		}
	}

	// Get all entries for tournament
	entries, err := trail.GetEntries(ctx, tournamentID, 10, 0)
	if err != nil {
		t.Fatalf("get entries: %v", err)
	}
	if len(entries) != 5 {
		t.Fatalf("expected 5 entries, got %d", len(entries))
	}

	// Test pagination
	page1, err := trail.GetEntries(ctx, tournamentID, 3, 0)
	if err != nil {
		t.Fatalf("get page 1: %v", err)
	}
	if len(page1) != 3 {
		t.Fatalf("expected 3 entries on page 1, got %d", len(page1))
	}

	page2, err := trail.GetEntries(ctx, tournamentID, 3, 3)
	if err != nil {
		t.Fatalf("get page 2: %v", err)
	}
	if len(page2) != 2 {
		t.Fatalf("expected 2 entries on page 2, got %d", len(page2))
	}
}

func TestGetEntriesFiltersByTournament(t *testing.T) {
	trail, _ := setupTestTrail(t)
	ctx := context.Background()

	t1 := "550e8400-e29b-41d4-a716-446655440010"
	t2 := "550e8400-e29b-41d4-a716-446655440011"

	// Record entries for two tournaments
	for i := 0; i < 3; i++ {
		trail.Record(ctx, AuditEntry{
			TournamentID: &t1,
			OperatorID:   "op-1",
			Action:       ActionPlayerBuyin,
			TargetType:   "player",
			TargetID:     "player-1",
		})
	}
	for i := 0; i < 2; i++ {
		trail.Record(ctx, AuditEntry{
			TournamentID: &t2,
			OperatorID:   "op-1",
			Action:       ActionPlayerBuyin,
			TargetType:   "player",
			TargetID:     "player-2",
		})
	}

	// Filter by tournament 1
	entries, err := trail.GetEntries(ctx, t1, 50, 0)
	if err != nil {
		t.Fatalf("get entries: %v", err)
	}
	if len(entries) != 3 {
		t.Fatalf("expected 3 entries for tournament 1, got %d", len(entries))
	}

	// Filter by tournament 2
	entries, err = trail.GetEntries(ctx, t2, 50, 0)
	if err != nil {
		t.Fatalf("get entries: %v", err)
	}
	if len(entries) != 2 {
		t.Fatalf("expected 2 entries for tournament 2, got %d", len(entries))
	}
}

func TestGetEntriesByAction(t *testing.T) {
	trail, _ := setupTestTrail(t)
	ctx := context.Background()

	// Record different action types
	trail.Record(ctx, AuditEntry{OperatorID: "op-1", Action: ActionPlayerBuyin, TargetType: "player", TargetID: "p-1"})
	trail.Record(ctx, AuditEntry{OperatorID: "op-1", Action: ActionPlayerBust, TargetType: "player", TargetID: "p-1"})
	trail.Record(ctx, AuditEntry{OperatorID: "op-1", Action: ActionPlayerBuyin, TargetType: "player", TargetID: "p-2"})

	entries, err := trail.GetEntriesByAction(ctx, ActionPlayerBuyin, 50, 0)
	if err != nil {
		t.Fatalf("get entries by action: %v", err)
	}
	if len(entries) != 2 {
		t.Fatalf("expected 2 buyin entries, got %d", len(entries))
	}
}

func TestRecorderFunc(t *testing.T) {
	trail, _ := setupTestTrail(t)
	ctx := context.Background()

	recorder := trail.RecorderFunc()

	err := recorder(ctx, ActionOperatorLogin, "operator", "op-1", map[string]interface{}{
		"operator_name": "Admin",
		"role":          "admin",
	})
	if err != nil {
		t.Fatalf("recorder func: %v", err)
	}

	// Verify entry was persisted
	entries, err := trail.GetEntriesByAction(ctx, ActionOperatorLogin, 50, 0)
	if err != nil {
		t.Fatalf("get entries: %v", err)
	}
	if len(entries) != 1 {
		t.Fatalf("expected 1 login entry, got %d", len(entries))
	}
	if entries[0].TargetType != "operator" {
		t.Fatalf("expected target_type operator, got %s", entries[0].TargetType)
	}
}