package personagen

import (
	"context"
	"encoding/json"
	"fmt"
	"log/slog"
	"testing"
	"time"

	"git.threesix.ai/jordan/persona-community-5/pkg/persona"
	"git.threesix.ai/jordan/persona-community-5/pkg/queue"
	"git.threesix.ai/jordan/persona-community-5/pkg/realtime"
)

// ── Mock implementations ─────────────────────────────────────────────────────

// mockPersonaStore implements PersonaStore for testing.
type mockPersonaStore struct {
	records map[string]*PersonaRecord
}

func newMockPersonaStore() *mockPersonaStore {
	return &mockPersonaStore{records: make(map[string]*PersonaRecord)}
}

func (m *mockPersonaStore) GetByID(_ context.Context, id string) (*PersonaRecord, error) {
	rec, ok := m.records[id]
	if !ok {
		return nil, ErrPersonaNotFound
	}
	// Return a copy to avoid shared mutation.
	cp := *rec
	if rec.Tags != nil {
		cp.Tags = make([]string, len(rec.Tags))
		copy(cp.Tags, rec.Tags)
	}
	if rec.ImageURLs != nil {
		cp.ImageURLs = make([]string, len(rec.ImageURLs))
		copy(cp.ImageURLs, rec.ImageURLs)
	}
	if rec.VideoURLs != nil {
		cp.VideoURLs = make([]string, len(rec.VideoURLs))
		copy(cp.VideoURLs, rec.VideoURLs)
	}
	if rec.SpecJSON != nil {
		cp.SpecJSON = make(json.RawMessage, len(rec.SpecJSON))
		copy(cp.SpecJSON, rec.SpecJSON)
	}
	return &cp, nil
}

func (m *mockPersonaStore) Update(_ context.Context, p *PersonaRecord) error {
	if _, ok := m.records[p.ID]; !ok {
		return ErrPersonaNotFound
	}
	m.records[p.ID] = p
	return nil
}

// mockProducer records enqueued jobs.
type mockProducer struct {
	jobs []enqueuedJob
}

type enqueuedJob struct {
	jobType string
	payload map[string]any
}

var _ queue.Producer = (*mockProducer)(nil)

func (m *mockProducer) Enqueue(_ context.Context, jobType string, payload map[string]any) (string, error) {
	m.jobs = append(m.jobs, enqueuedJob{jobType: jobType, payload: payload})
	return fmt.Sprintf("job-%d", len(m.jobs)), nil
}

func (m *mockProducer) EnqueueWithOptions(_ context.Context, job queue.Job) (string, error) {
	m.jobs = append(m.jobs, enqueuedJob{jobType: job.Type, payload: job.Payload})
	return fmt.Sprintf("job-%d", len(m.jobs)), nil
}

// mockPublisher records published events.
type mockPublisher struct {
	userEvents   []publishedEvent
	channelEvents []publishedEvent
}

type publishedEvent struct {
	target string
	event  *realtime.SSEEvent
}

var _ realtime.EventPublisher = (*mockPublisher)(nil)

func (m *mockPublisher) SendToUser(userID string, event *realtime.SSEEvent) error {
	m.userEvents = append(m.userEvents, publishedEvent{target: userID, event: event})
	return nil
}

func (m *mockPublisher) SendToChannel(channel string, event *realtime.SSEEvent) error {
	m.channelEvents = append(m.channelEvents, publishedEvent{target: channel, event: event})
	return nil
}

// ── Tests ────────────────────────────────────────────────────────────────────

func TestStagedQueueHandler_MissingPersonaID(t *testing.T) {
	handler := StagedQueueHandler(PipelineDeps{})

	job := &queue.Job{
		ID:      "test-job",
		Type:    "persona_generate",
		Payload: map[string]any{"stage": "spec"},
	}

	err := handler(context.Background(), job)
	if err == nil {
		t.Fatal("expected error for missing persona_id")
	}
	if err.Error() != "missing persona_id in persona_generate job payload" {
		t.Errorf("unexpected error: %v", err)
	}
}

func TestStagedQueueHandler_MissingStage(t *testing.T) {
	handler := StagedQueueHandler(PipelineDeps{})

	job := &queue.Job{
		ID:      "test-job",
		Type:    "persona_generate",
		Payload: map[string]any{"persona_id": "ps_test"},
	}

	err := handler(context.Background(), job)
	if err == nil {
		t.Fatal("expected error for missing stage")
	}
	if err.Error() != "missing stage in persona_generate job payload" {
		t.Errorf("unexpected error: %v", err)
	}
}

func TestStagedQueueHandler_UnknownStage(t *testing.T) {
	store := newMockPersonaStore()
	pub := &mockPublisher{}
	handler := StagedQueueHandler(PipelineDeps{
		Personas: store,
		Pub:      pub,
		Logger:   noopLogger(),
	})

	job := &queue.Job{
		ID:   "test-job",
		Type: "persona_generate",
		Payload: map[string]any{
			"persona_id": "ps_test",
			"stage":      "unknown_stage",
		},
	}

	err := handler(context.Background(), job)
	if err == nil {
		t.Fatal("expected error for unknown stage")
	}
}

func TestStagedQueueHandler_SpecStage_PersonaNotFound(t *testing.T) {
	store := newMockPersonaStore()
	pub := &mockPublisher{}
	handler := StagedQueueHandler(PipelineDeps{
		Personas: store,
		Pub:      pub,
		Logger:   noopLogger(),
	})

	job := &queue.Job{
		ID:   "test-job",
		Type: "persona_generate",
		Payload: map[string]any{
			"persona_id": "ps_nonexistent",
			"stage":      StageSpec,
		},
	}

	err := handler(context.Background(), job)
	if err == nil {
		t.Fatal("expected error for persona not found")
	}
}

func TestExtractTags(t *testing.T) {
	spec := &persona.PersonaSpec{
		DNA: &persona.DNA{
			Identity: persona.IdentityDNA{
				Gender:    persona.GenderWoman,
				Ethnicity: persona.EthnicityEastAsian,
			},
		},
		Name: persona.NameSpec{First: "Luna"},
		Lifestyle: persona.Lifestyle{
			FashionSense: persona.FashionSense{
				Primary: persona.FashionClassicMinimalist,
			},
			Interests: persona.Interests{
				Creative: []string{"photography", "painting"},
				Active:   []string{"yoga", "hiking"},
			},
		},
	}

	tags := extractTags(spec)
	if len(tags) > 8 {
		t.Errorf("expected at most 8 tags, got %d", len(tags))
	}
	if len(tags) == 0 {
		t.Error("expected at least some tags")
	}

	// Should contain gender.
	found := false
	for _, tag := range tags {
		if tag == "woman" {
			found = true
			break
		}
	}
	if !found {
		t.Error("expected 'woman' tag")
	}
}

func TestCountCompletedImages(t *testing.T) {
	spec := &persona.PersonaSpec{
		ImageMatrix: []persona.ImageSpec{
			{Position: 1, Status: persona.ImageStatusComplete},
			{Position: 2, Status: persona.ImageStatusComplete},
			{Position: 3, Status: persona.ImageStatusPending},
			{Position: 4, Status: persona.ImageStatusFailed},
		},
	}

	count := countCompletedImages(spec)
	if count != 2 {
		t.Errorf("expected 2 completed, got %d", count)
	}
}

func TestAppendIfMissing(t *testing.T) {
	tests := []struct {
		name     string
		slice    []string
		s        string
		expected int
	}{
		{"adds new", []string{"a"}, "b", 2},
		{"skips duplicate", []string{"a", "b"}, "a", 2},
		{"skips empty", []string{"a"}, "", 1},
		{"adds to nil", nil, "a", 1},
	}

	for _, tt := range tests {
		t.Run(tt.name, func(t *testing.T) {
			result := appendIfMissing(tt.slice, tt.s)
			if len(result) != tt.expected {
				t.Errorf("expected len %d, got %d", tt.expected, len(result))
			}
		})
	}
}

func TestGenerateHandle(t *testing.T) {
	// Override time for deterministic output.
	origNow := now
	now = func() time.Time { return time.UnixMilli(1234567890) }
	defer func() { now = origNow }()

	tests := []struct {
		name  string
		input string
	}{
		{"simple name", "Luna Shadow"},
		{"special chars", "DJ Beats!@#"},
		{"unicode", "Café Noir"},
	}

	for _, tt := range tests {
		t.Run(tt.name, func(t *testing.T) {
			handle := generateHandle(tt.input)
			if handle == "" {
				t.Error("expected non-empty handle")
			}
			if len(handle) > 50 {
				t.Errorf("handle too long: %d chars", len(handle))
			}
		})
	}
}

func TestPublishJobUpdate(t *testing.T) {
	pub := &mockPublisher{}

	publishJobUpdate(pub, "ps_123", StageSpec, "complete", 100, "")

	if len(pub.channelEvents) != 1 {
		t.Fatalf("expected 1 channel event, got %d", len(pub.channelEvents))
	}

	event := pub.channelEvents[0]
	if event.target != "channel:personas" {
		t.Errorf("expected channel 'channel:personas', got '%s'", event.target)
	}
	if event.event.Type != "job_update" {
		t.Errorf("expected event type 'job_update', got '%s'", event.event.Type)
	}
	if event.event.Progress != 100 {
		t.Errorf("expected progress 100, got %d", event.event.Progress)
	}

	result, ok := event.event.Result.(map[string]any)
	if !ok {
		t.Fatal("expected Result to be map")
	}
	if result["persona_id"] != "ps_123" {
		t.Errorf("expected persona_id 'ps_123', got %v", result["persona_id"])
	}
	if result["stage"] != StageSpec {
		t.Errorf("expected stage 'spec', got %v", result["stage"])
	}
	if result["status"] != "complete" {
		t.Errorf("expected status 'complete', got %v", result["status"])
	}
}

func TestPublishJobUpdate_WithError(t *testing.T) {
	pub := &mockPublisher{}

	publishJobUpdate(pub, "ps_123", StageSpec, "error", 0, "something went wrong")

	if len(pub.channelEvents) != 1 {
		t.Fatalf("expected 1 channel event, got %d", len(pub.channelEvents))
	}

	event := pub.channelEvents[0]
	if event.event.Error != "something went wrong" {
		t.Errorf("expected error message, got '%s'", event.event.Error)
	}
}

func TestUnmarshalSpec_EmptyJSON(t *testing.T) {
	_, err := unmarshalSpec(nil)
	if err == nil {
		t.Fatal("expected error for nil spec JSON")
	}

	_, err = unmarshalSpec(json.RawMessage{})
	if err == nil {
		t.Fatal("expected error for empty spec JSON")
	}
}

func TestUnmarshalSpec_ValidJSON(t *testing.T) {
	spec := &persona.PersonaSpec{
		ID:   "ps_test",
		Name: persona.NameSpec{First: "Luna", Last: "Shadow"},
	}
	data, _ := json.Marshal(spec)

	result, err := unmarshalSpec(data)
	if err != nil {
		t.Fatalf("unexpected error: %v", err)
	}
	if result.ID != "ps_test" {
		t.Errorf("expected ID 'ps_test', got '%s'", result.ID)
	}
	if result.Name.First != "Luna" {
		t.Errorf("expected first name 'Luna', got '%s'", result.Name.First)
	}
}

// noopLogger returns a discard logger for tests.
func noopLogger() *slog.Logger {
	return slog.Default() // In test context, logs go to stderr which is fine
}