package api

import (
	"context"
	"encoding/json"
	"net/http"
	"net/http/httptest"
	"path/filepath"
	"strings"
	"testing"

	"github.com/rcourtman/pulse-go-rewrite/internal/agentexec"
	"github.com/rcourtman/pulse-go-rewrite/internal/ai/chat"
	"github.com/rcourtman/pulse-go-rewrite/internal/config"
	"github.com/rcourtman/pulse-go-rewrite/internal/models"
	"github.com/rcourtman/pulse-go-rewrite/internal/monitoring"
	"github.com/stretchr/testify/assert"
	"github.com/stretchr/testify/mock"
)

type MockAIService struct {
	mock.Mock
}

func (m *MockAIService) Start(ctx context.Context) error {
	args := m.Called(ctx)
	return args.Error(0)
}

func (m *MockAIService) Stop(ctx context.Context) error {
	args := m.Called(ctx)
	return args.Error(0)
}

func (m *MockAIService) Restart(ctx context.Context, newCfg *config.AIConfig) error {
	args := m.Called(ctx, newCfg)
	return args.Error(0)
}

func (m *MockAIService) IsRunning() bool {
	args := m.Called()
	return args.Bool(0)
}

func (m *MockAIService) Execute(ctx context.Context, req chat.ExecuteRequest) (map[string]interface{}, error) {
	args := m.Called(ctx, req)
	if args.Get(0) == nil {
		return nil, args.Error(1)
	}
	return args.Get(0).(map[string]interface{}), args.Error(1)
}

func (m *MockAIService) ExecuteStream(ctx context.Context, req chat.ExecuteRequest, callback chat.StreamCallback) error {
	args := m.Called(ctx, req, callback)
	return args.Error(0)
}

func (m *MockAIService) ListSessions(ctx context.Context) ([]chat.Session, error) {
	args := m.Called(ctx)
	return args.Get(0).([]chat.Session), args.Error(1)
}

func (m *MockAIService) CreateSession(ctx context.Context) (*chat.Session, error) {
	args := m.Called(ctx)
	if args.Get(0) == nil {
		return nil, args.Error(1)
	}
	return args.Get(0).(*chat.Session), args.Error(1)
}

func (m *MockAIService) DeleteSession(ctx context.Context, sessionID string) error {
	args := m.Called(ctx, sessionID)
	return args.Error(0)
}

func (m *MockAIService) GetMessages(ctx context.Context, sessionID string) ([]chat.Message, error) {
	args := m.Called(ctx, sessionID)
	return args.Get(0).([]chat.Message), args.Error(1)
}

func (m *MockAIService) AbortSession(ctx context.Context, sessionID string) error {
	args := m.Called(ctx, sessionID)
	return args.Error(0)
}

func (m *MockAIService) SummarizeSession(ctx context.Context, sessionID string) (map[string]interface{}, error) {
	args := m.Called(ctx, sessionID)
	return args.Get(0).(map[string]interface{}), args.Error(1)
}

func (m *MockAIService) GetSessionDiff(ctx context.Context, sessionID string) (map[string]interface{}, error) {
	args := m.Called(ctx, sessionID)
	return args.Get(0).(map[string]interface{}), args.Error(1)
}

func (m *MockAIService) ForkSession(ctx context.Context, sessionID string) (*chat.Session, error) {
	args := m.Called(ctx, sessionID)
	if args.Get(0) == nil {
		return nil, args.Error(1)
	}
	return args.Get(0).(*chat.Session), args.Error(1)
}

func (m *MockAIService) RevertSession(ctx context.Context, sessionID string) (map[string]interface{}, error) {
	args := m.Called(ctx, sessionID)
	return args.Get(0).(map[string]interface{}), args.Error(1)
}

func (m *MockAIService) UnrevertSession(ctx context.Context, sessionID string) (map[string]interface{}, error) {
	args := m.Called(ctx, sessionID)
	return args.Get(0).(map[string]interface{}), args.Error(1)
}

func (m *MockAIService) AnswerQuestion(ctx context.Context, questionID string, answers []chat.QuestionAnswer) error {
	args := m.Called(ctx, questionID, answers)
	return args.Error(0)
}

func (m *MockAIService) SetAlertProvider(provider chat.MCPAlertProvider)       { m.Called(provider) }
func (m *MockAIService) SetFindingsProvider(provider chat.MCPFindingsProvider) { m.Called(provider) }
func (m *MockAIService) SetBaselineProvider(provider chat.MCPBaselineProvider) { m.Called(provider) }
func (m *MockAIService) SetPatternProvider(provider chat.MCPPatternProvider)   { m.Called(provider) }
func (m *MockAIService) SetMetricsHistory(provider chat.MCPMetricsHistoryProvider) {
	m.Called(provider)
}
func (m *MockAIService) SetBackupProvider(provider chat.MCPBackupProvider)   { m.Called(provider) }
func (m *MockAIService) SetStorageProvider(provider chat.MCPStorageProvider) { m.Called(provider) }
func (m *MockAIService) SetGuestConfigProvider(provider chat.MCPGuestConfigProvider) {
	m.Called(provider)
}
func (m *MockAIService) SetDiskHealthProvider(provider chat.MCPDiskHealthProvider) {
	m.Called(provider)
}
func (m *MockAIService) SetUpdatesProvider(provider chat.MCPUpdatesProvider) { m.Called(provider) }
func (m *MockAIService) SetAgentProfileManager(manager chat.AgentProfileManager) {
	m.Called(manager)
}
func (m *MockAIService) SetFindingsManager(manager chat.FindingsManager) { m.Called(manager) }
func (m *MockAIService) SetMetadataUpdater(updater chat.MetadataUpdater) { m.Called(updater) }
func (m *MockAIService) SetKnowledgeStoreProvider(provider chat.KnowledgeStoreProvider) {
	m.Called(provider)
}
func (m *MockAIService) SetIncidentRecorderProvider(provider chat.IncidentRecorderProvider) {
	m.Called(provider)
}
func (m *MockAIService) SetEventCorrelatorProvider(provider chat.EventCorrelatorProvider) {
	m.Called(provider)
}
func (m *MockAIService) SetTopologyProvider(provider chat.TopologyProvider) { m.Called(provider) }
func (m *MockAIService) SetDiscoveryProvider(provider chat.MCPDiscoveryProvider) {
	m.Called(provider)
}

func (m *MockAIService) UpdateControlSettings(cfg *config.AIConfig) { m.Called(cfg) }
func (m *MockAIService) GetBaseURL() string {
	args := m.Called()
	return args.String(0)
}

type MockAIPersistence struct {
	mock.Mock
	dataDir string
}

func (m *MockAIPersistence) LoadAIConfig() (*config.AIConfig, error) {
	args := m.Called()
	if args.Get(0) == nil {
		return nil, args.Error(1)
	}
	return args.Get(0).(*config.AIConfig), args.Error(1)
}

func (m *MockAIPersistence) DataDir() string {
	return m.dataDir
}

type MockAIStateProvider struct {
	mock.Mock
}

func (m *MockAIStateProvider) GetState() models.StateSnapshot {
	args := m.Called()
	return args.Get(0).(models.StateSnapshot)
}

func newTestAIHandler(cfg *config.Config, persistence AIPersistence, _ *agentexec.Server) *AIHandler {
	handler := NewAIHandler(nil, nil, nil)
	handler.legacyConfig = cfg
	handler.legacyPersistence = persistence
	return handler
}

func TestStart(t *testing.T) {
	// Mock newChatService
	oldNewService := newChatService
	defer func() { newChatService = oldNewService }()

	mockSvc := new(MockAIService)
	var capturedCfg chat.Config
	newChatService = func(cfg chat.Config) AIService {
		capturedCfg = cfg
		return mockSvc
	}

	mockPersist := new(MockAIPersistence)
	h := newTestAIHandler(&config.Config{}, mockPersist, nil)

	// AI disabled in config
	mockPersist.On("LoadAIConfig").Return(&config.AIConfig{Enabled: false}, nil).Once()
	err := h.Start(context.Background(), nil)
	assert.NoError(t, err)
	assert.Nil(t, h.legacyService)

	// AI enabled
	aiCfg := &config.AIConfig{Enabled: true, Model: "test"}
	mockPersist.On("LoadAIConfig").Return(aiCfg, nil).Once()
	mockSvc.On("Start", mock.Anything).Return(nil).Once()

	err = h.Start(context.Background(), nil)
	assert.NoError(t, err)
	assert.Equal(t, mockSvc, h.legacyService)
	assert.Equal(t, "data", capturedCfg.DataDir)
}

func TestStop(t *testing.T) {
	mockSvc := new(MockAIService)
	h := newTestAIHandler(nil, nil, nil)
	h.legacyService = mockSvc

	mockSvc.On("Stop", mock.Anything).Return(nil)
	err := h.Stop(context.Background())
	assert.NoError(t, err)

	// Nil service
	h.legacyService = nil
	err = h.Stop(context.Background())
	assert.NoError(t, err)
}

func TestStart_Error(t *testing.T) {
	oldNewService := newChatService
	defer func() { newChatService = oldNewService }()

	mockSvc := new(MockAIService)
	newChatService = func(cfg chat.Config) AIService {
		return mockSvc
	}

	mockPersist := new(MockAIPersistence)
	h := newTestAIHandler(&config.Config{}, mockPersist, nil)

	aiCfg := &config.AIConfig{Enabled: true, Model: "test"}
	mockPersist.On("LoadAIConfig").Return(aiCfg, nil)
	mockSvc.On("Start", mock.Anything).Return(assert.AnError)

	err := h.Start(context.Background(), nil)
	assert.Error(t, err)
}

func TestRestart(t *testing.T) {
	mockPersist := new(MockAIPersistence)
	mockSvc := new(MockAIService)
	h := newTestAIHandler(nil, mockPersist, nil)
	h.legacyService = mockSvc

	aiCfg := &config.AIConfig{}
	mockPersist.On("LoadAIConfig").Return(aiCfg, nil)
	mockSvc.On("IsRunning").Return(true)
	mockSvc.On("Restart", mock.Anything, aiCfg).Return(nil)
	err := h.Restart(context.Background())
	assert.NoError(t, err)

	// Service nil
	h.legacyService = nil
	err = h.Restart(context.Background())
	assert.NoError(t, err)
}

func TestRestart_StartsStoppedServiceWithSavedStateProvider(t *testing.T) {
	oldNewService := newChatService
	defer func() { newChatService = oldNewService }()

	mockPersist := &MockAIPersistence{dataDir: "data"}
	stoppedSvc := new(MockAIService)
	startedSvc := new(MockAIService)
	mockState := new(MockAIStateProvider)
	var capturedCfg chat.Config

	newChatService = func(cfg chat.Config) AIService {
		capturedCfg = cfg
		return startedSvc
	}

	h := newTestAIHandler(nil, mockPersist, nil)
	h.legacyService = stoppedSvc
	h.SetStateProvider(mockState)

	aiCfg := &config.AIConfig{Enabled: true, Model: "test"}
	mockPersist.On("LoadAIConfig").Return(aiCfg, nil).Once()
	stoppedSvc.On("IsRunning").Return(false).Once()
	startedSvc.On("Start", mock.Anything).Return(nil).Once()

	err := h.Restart(context.Background())
	assert.NoError(t, err)
	assert.Equal(t, startedSvc, h.legacyService)
	assert.Same(t, mockState, capturedCfg.StateProvider)
	assert.Equal(t, "data", capturedCfg.DataDir)
}

func TestStart_DefaultsEmptyPersistenceDataDir(t *testing.T) {
	oldNewService := newChatService
	defer func() { newChatService = oldNewService }()

	mockSvc := new(MockAIService)
	mockState := new(MockAIStateProvider)
	mockPersist := &MockAIPersistence{}
	var capturedCfg chat.Config
	newChatService = func(cfg chat.Config) AIService {
		capturedCfg = cfg
		return mockSvc
	}

	h := newTestAIHandler(&config.Config{}, mockPersist, nil)
	mockPersist.On("LoadAIConfig").Return(&config.AIConfig{Enabled: true, Model: "test"}, nil).Once()

	mockSvc.On("Start", mock.Anything).Return(nil).Once()

	err := h.Start(context.Background(), mockState)
	assert.NoError(t, err)
	assert.Equal(t, "data", capturedCfg.DataDir)
	assert.Same(t, mockState, capturedCfg.StateProvider)
}

func TestGetService(t *testing.T) {
	mockSvc := new(MockAIService)
	h := newTestAIHandler(nil, nil, nil)
	h.legacyService = mockSvc
	assert.Equal(t, mockSvc, h.GetService(context.Background()))
}

func TestGetAIConfig(t *testing.T) {
	mockPersist := new(MockAIPersistence)
	h := newTestAIHandler(nil, mockPersist, nil)

	aiCfg := &config.AIConfig{Model: "test"}
	mockPersist.On("LoadAIConfig").Return(aiCfg, nil)

	result := h.GetAIConfig(context.Background())
	assert.Equal(t, aiCfg, result)
}

func TestLoadAIConfig_Error(t *testing.T) {
	mockPersist := new(MockAIPersistence)
	h := newTestAIHandler(nil, mockPersist, nil)

	mockPersist.On("LoadAIConfig").Return((*config.AIConfig)(nil), assert.AnError)

	result := h.loadAIConfig(context.Background())
	assert.Nil(t, result)
}

func TestHandleStatus(t *testing.T) {
	cfg := &config.Config{
		APIToken: "test-token",
	}
	h := newTestAIHandler(cfg, nil, nil)
	mockSvc := new(MockAIService)
	h.legacyService = mockSvc

	mockSvc.On("IsRunning").Return(true)

	req := httptest.NewRequest("GET", "/api/ai/status", nil)

	w := httptest.NewRecorder()

	h.HandleStatus(w, req)

	assert.Equal(t, http.StatusOK, w.Code)
	var resp map[string]interface{}
	err := json.NewDecoder(w.Body).Decode(&resp)
	assert.NoError(t, err)
	assert.True(t, resp["running"].(bool))
	assert.Equal(t, "direct", resp["engine"])
}

func TestHandleSessions(t *testing.T) {
	cfg := &config.Config{}
	h := newTestAIHandler(cfg, nil, nil)
	mockSvc := new(MockAIService)
	h.legacyService = mockSvc

	mockSvc.On("IsRunning").Return(true)
	sessions := []chat.Session{{ID: "s1"}, {ID: "s2"}}
	mockSvc.On("ListSessions", mock.Anything).Return(sessions, nil)

	req := httptest.NewRequest("GET", "/api/ai/sessions", nil)
	w := httptest.NewRecorder()

	h.HandleSessions(w, req)

	assert.Equal(t, http.StatusOK, w.Code)
}

func TestHandleCreateSession(t *testing.T) {
	cfg := &config.Config{}
	h := newTestAIHandler(cfg, nil, nil)
	mockSvc := new(MockAIService)
	h.legacyService = mockSvc

	mockSvc.On("IsRunning").Return(true)
	session := &chat.Session{ID: "new-session"}
	mockSvc.On("CreateSession", mock.Anything).Return(session, nil)

	req := httptest.NewRequest("POST", "/api/ai/sessions", nil)
	w := httptest.NewRecorder()

	h.HandleCreateSession(w, req)

	assert.Equal(t, http.StatusOK, w.Code)
}

func TestHandleDeleteSession(t *testing.T) {
	cfg := &config.Config{}
	h := newTestAIHandler(cfg, nil, nil)
	mockSvc := new(MockAIService)
	h.legacyService = mockSvc

	mockSvc.On("IsRunning").Return(true)
	mockSvc.On("DeleteSession", mock.Anything, "s1").Return(nil)

	req := httptest.NewRequest("DELETE", "/api/ai/sessions/s1", nil)
	w := httptest.NewRecorder()

	h.HandleDeleteSession(w, req, "s1")

	assert.Equal(t, http.StatusNoContent, w.Code)
}

func TestHandleMessages(t *testing.T) {
	cfg := &config.Config{}
	h := newTestAIHandler(cfg, nil, nil)
	mockSvc := new(MockAIService)
	h.legacyService = mockSvc

	mockSvc.On("IsRunning").Return(true)
	messages := []chat.Message{{Role: "user", Content: "hello"}}
	mockSvc.On("GetMessages", mock.Anything, "s1").Return(messages, nil)

	req := httptest.NewRequest("GET", "/api/ai/sessions/s1/messages", nil)
	w := httptest.NewRecorder()

	h.HandleMessages(w, req, "s1")

	assert.Equal(t, http.StatusOK, w.Code)
}

func TestHandleChat_NotRunning(t *testing.T) {
	cfg := &config.Config{}
	h := newTestAIHandler(cfg, nil, nil)
	mockSvc := new(MockAIService)
	h.legacyService = mockSvc

	mockSvc.On("IsRunning").Return(false)

	req := httptest.NewRequest("POST", "/api/ai/chat", nil)
	w := httptest.NewRecorder()

	h.HandleChat(w, req)

	assert.Equal(t, http.StatusServiceUnavailable, w.Code)
}

func TestHandleChat_InvalidJSON(t *testing.T) {
	cfg := &config.Config{}
	h := newTestAIHandler(cfg, nil, nil)
	mockSvc := new(MockAIService)
	h.legacyService = mockSvc

	mockSvc.On("IsRunning").Return(true)

	req := httptest.NewRequest("POST", "/api/ai/chat", strings.NewReader("invalid"))
	w := httptest.NewRecorder()

	h.HandleChat(w, req)

	assert.Equal(t, http.StatusBadRequest, w.Code)
}

func TestHandleChat_Success(t *testing.T) {
	cfg := &config.Config{}
	h := newTestAIHandler(cfg, nil, nil)
	mockSvc := new(MockAIService)
	h.legacyService = mockSvc

	mockSvc.On("IsRunning").Return(true)

	// Mock ExecuteStream to just return nil
	mockSvc.On("ExecuteStream", mock.Anything, mock.Anything, mock.Anything).Return(nil).Run(func(args mock.Arguments) {
		callback := args.Get(2).(chat.StreamCallback)
		data, _ := json.Marshal("hello")
		callback(chat.StreamEvent{Type: "content", Data: data})
	})

	body := `{"prompt": "hi"}`
	req := httptest.NewRequest("POST", "/api/ai/chat", strings.NewReader(body))
	w := httptest.NewRecorder()

	h.HandleChat(w, req)

	assert.Equal(t, http.StatusOK, w.Code)
	assert.Contains(t, w.Header().Get("Content-Type"), "text/event-stream")
}

func TestHandleAnswerQuestion(t *testing.T) {
	cfg := &config.Config{}
	h := newTestAIHandler(cfg, nil, nil)
	mockSvc := new(MockAIService)
	h.legacyService = mockSvc

	mockSvc.On("IsRunning").Return(true)
	mockSvc.On("AnswerQuestion", mock.Anything, "q1", mock.Anything).Return(nil)

	body := `{"answers": [{"id": "a1", "value": "v1"}]}`
	req := httptest.NewRequest("POST", "/api/ai/question/q1/answer", strings.NewReader(body))
	w := httptest.NewRecorder()

	h.HandleAnswerQuestion(w, req, "q1")

	assert.Equal(t, http.StatusOK, w.Code)
}

func TestHandleSessions_NotRunning(t *testing.T) {
	h := newTestAIHandler(&config.Config{}, nil, nil)
	mockSvc := new(MockAIService)
	h.legacyService = mockSvc
	mockSvc.On("IsRunning").Return(false)

	req := httptest.NewRequest("GET", "/api/ai/sessions", nil)
	w := httptest.NewRecorder()
	h.HandleSessions(w, req)
	assert.Equal(t, http.StatusServiceUnavailable, w.Code)
}

func TestHandleSessions_Error(t *testing.T) {
	h := newTestAIHandler(&config.Config{}, nil, nil)
	mockSvc := new(MockAIService)
	h.legacyService = mockSvc
	mockSvc.On("IsRunning").Return(true)
	mockSvc.On("ListSessions", mock.Anything).Return(([]chat.Session)(nil), assert.AnError)

	req := httptest.NewRequest("GET", "/api/ai/sessions", nil)
	w := httptest.NewRecorder()
	h.HandleSessions(w, req)
	assert.Equal(t, http.StatusInternalServerError, w.Code)
}

func TestHandleCreateSession_Error(t *testing.T) {
	h := newTestAIHandler(&config.Config{}, nil, nil)
	mockSvc := new(MockAIService)
	h.legacyService = mockSvc
	mockSvc.On("IsRunning").Return(true)
	mockSvc.On("CreateSession", mock.Anything).Return((*chat.Session)(nil), assert.AnError)

	req := httptest.NewRequest("POST", "/api/ai/sessions", nil)
	w := httptest.NewRecorder()
	h.HandleCreateSession(w, req)
	assert.Equal(t, http.StatusInternalServerError, w.Code)
}

func TestHandleDeleteSession_Error(t *testing.T) {
	h := newTestAIHandler(&config.Config{}, nil, nil)
	mockSvc := new(MockAIService)
	h.legacyService = mockSvc
	mockSvc.On("IsRunning").Return(true)
	mockSvc.On("DeleteSession", mock.Anything, "s1").Return(assert.AnError)

	req := httptest.NewRequest("DELETE", "/api/ai/sessions/s1", nil)
	w := httptest.NewRecorder()
	h.HandleDeleteSession(w, req, "s1")
	assert.Equal(t, http.StatusInternalServerError, w.Code)
}

func TestHandleMessages_Error(t *testing.T) {
	h := newTestAIHandler(&config.Config{}, nil, nil)
	mockSvc := new(MockAIService)
	h.legacyService = mockSvc
	mockSvc.On("IsRunning").Return(true)
	mockSvc.On("GetMessages", mock.Anything, "s1").Return(([]chat.Message)(nil), assert.AnError)

	req := httptest.NewRequest("GET", "/api/ai/sessions/s1/messages", nil)
	w := httptest.NewRecorder()
	h.HandleMessages(w, req, "s1")
	assert.Equal(t, http.StatusInternalServerError, w.Code)
}

func TestHandleAbort_Error(t *testing.T) {
	h := newTestAIHandler(&config.Config{}, nil, nil)
	mockSvc := new(MockAIService)
	h.legacyService = mockSvc
	mockSvc.On("IsRunning").Return(true)
	mockSvc.On("AbortSession", mock.Anything, "s1").Return(assert.AnError)

	req := httptest.NewRequest("POST", "/api/ai/sessions/s1/abort", nil)
	w := httptest.NewRecorder()
	h.HandleAbort(w, req, "s1")
	assert.Equal(t, http.StatusInternalServerError, w.Code)
}

func TestHandleSummarize_Error(t *testing.T) {
	h := newTestAIHandler(&config.Config{}, nil, nil)
	mockSvc := new(MockAIService)
	h.legacyService = mockSvc
	mockSvc.On("IsRunning").Return(true)
	mockSvc.On("SummarizeSession", mock.Anything, "s1").Return((map[string]interface{})(nil), assert.AnError)

	req := httptest.NewRequest("POST", "/api/ai/sessions/s1/summarize", nil)
	w := httptest.NewRecorder()
	h.HandleSummarize(w, req, "s1")
	assert.Equal(t, http.StatusInternalServerError, w.Code)
}

func TestHandleAnswerQuestion_InvalidJSON(t *testing.T) {
	h := newTestAIHandler(&config.Config{}, nil, nil)
	mockSvc := new(MockAIService)
	h.legacyService = mockSvc
	mockSvc.On("IsRunning").Return(true)

	req := httptest.NewRequest("POST", "/api/ai/question/q1/answer", strings.NewReader("invalid"))
	w := httptest.NewRecorder()
	h.HandleAnswerQuestion(w, req, "q1")
	assert.Equal(t, http.StatusBadRequest, w.Code)
}

func TestHandleAnswerQuestion_Error(t *testing.T) {
	h := newTestAIHandler(&config.Config{}, nil, nil)
	mockSvc := new(MockAIService)
	h.legacyService = mockSvc
	mockSvc.On("IsRunning").Return(true)
	mockSvc.On("AnswerQuestion", mock.Anything, "q1", mock.Anything).Return(assert.AnError)

	body := `{"answers": []}`
	req := httptest.NewRequest("POST", "/api/ai/question/q1/answer", strings.NewReader(body))
	w := httptest.NewRecorder()
	h.HandleAnswerQuestion(w, req, "q1")
	assert.Equal(t, http.StatusInternalServerError, w.Code)
}

func TestHandleChat_Options(t *testing.T) {
	h := newTestAIHandler(nil, nil, nil)
	req := httptest.NewRequest("OPTIONS", "/api/ai/chat", nil)
	req.Header.Set("Origin", "http://example.com")
	w := httptest.NewRecorder()
	h.HandleChat(w, req)
	assert.Equal(t, http.StatusOK, w.Code)
	assert.Equal(t, "http://example.com", w.Header().Get("Access-Control-Allow-Origin"))
}

func TestHandleChat_MethodNotAllowed(t *testing.T) {
	h := newTestAIHandler(nil, nil, nil)
	req := httptest.NewRequest("GET", "/api/ai/chat", nil)
	w := httptest.NewRecorder()
	h.HandleChat(w, req)
	assert.Equal(t, http.StatusMethodNotAllowed, w.Code)
}

func TestHandleChat_Error(t *testing.T) {
	cfg := &config.Config{}
	h := newTestAIHandler(cfg, nil, nil)
	mockSvc := new(MockAIService)
	h.legacyService = mockSvc
	mockSvc.On("IsRunning").Return(true)
	mockSvc.On("ExecuteStream", mock.Anything, mock.Anything, mock.Anything).Return(assert.AnError)

	body := `{"prompt": "hi"}`
	req := httptest.NewRequest("POST", "/api/ai/chat", strings.NewReader(body))
	w := httptest.NewRecorder()
	h.HandleChat(w, req)
	// ExecuteStream error happens after headers are sent, so w.Code might be 200
	// but the error is returned.
	assert.Equal(t, http.StatusOK, w.Code)
}

func TestHandleDiff_Error(t *testing.T) {
	h := newTestAIHandler(&config.Config{}, nil, nil)
	mockSvc := new(MockAIService)
	h.legacyService = mockSvc
	mockSvc.On("IsRunning").Return(true)
	mockSvc.On("GetSessionDiff", mock.Anything, "s1").Return((map[string]interface{})(nil), assert.AnError)

	req := httptest.NewRequest("GET", "/api/ai/sessions/s1/diff", nil)
	w := httptest.NewRecorder()
	h.HandleDiff(w, req, "s1")
	assert.Equal(t, http.StatusInternalServerError, w.Code)
}

func TestHandleFork_Error(t *testing.T) {
	h := newTestAIHandler(&config.Config{}, nil, nil)
	mockSvc := new(MockAIService)
	h.legacyService = mockSvc
	mockSvc.On("IsRunning").Return(true)
	mockSvc.On("ForkSession", mock.Anything, "s1").Return((*chat.Session)(nil), assert.AnError)

	req := httptest.NewRequest("POST", "/api/ai/sessions/s1/fork", nil)
	w := httptest.NewRecorder()
	h.HandleFork(w, req, "s1")
	assert.Equal(t, http.StatusInternalServerError, w.Code)
}

func TestHandleRevert_Error(t *testing.T) {
	h := newTestAIHandler(&config.Config{}, nil, nil)
	mockSvc := new(MockAIService)
	h.legacyService = mockSvc
	mockSvc.On("IsRunning").Return(true)
	mockSvc.On("RevertSession", mock.Anything, "s1").Return((map[string]interface{})(nil), assert.AnError)

	req := httptest.NewRequest("POST", "/api/ai/sessions/s1/revert", nil)
	w := httptest.NewRecorder()
	h.HandleRevert(w, req, "s1")
	assert.Equal(t, http.StatusInternalServerError, w.Code)
}

func TestHandleUnrevert_Error(t *testing.T) {
	h := newTestAIHandler(&config.Config{}, nil, nil)
	mockSvc := new(MockAIService)
	h.legacyService = mockSvc
	mockSvc.On("IsRunning").Return(true)
	mockSvc.On("UnrevertSession", mock.Anything, "s1").Return((map[string]interface{})(nil), assert.AnError)

	req := httptest.NewRequest("POST", "/api/ai/sessions/s1/unrevert", nil)
	w := httptest.NewRecorder()
	h.HandleUnrevert(w, req, "s1")
	assert.Equal(t, http.StatusInternalServerError, w.Code)
}

func TestHandleStatus_NotRunning(t *testing.T) {
	h := newTestAIHandler(&config.Config{}, nil, nil)
	mockSvc := new(MockAIService)
	h.legacyService = mockSvc
	mockSvc.On("IsRunning").Return(false)

	req := httptest.NewRequest("GET", "/api/ai/status", nil)
	w := httptest.NewRecorder()
	h.HandleStatus(w, req)
	assert.Equal(t, http.StatusOK, w.Code) // HandleStatus returns 200 even if not running
	var resp map[string]interface{}
	json.NewDecoder(w.Body).Decode(&resp)
	assert.False(t, resp["running"].(bool))
}

func TestMockUnimplemented(t *testing.T) {
	mockSvc := new(MockAIService)
	mockSvc.On("SetFindingsManager", mock.Anything).Return()
	mockSvc.On("SetMetadataUpdater", mock.Anything).Return()
	mockSvc.On("UpdateControlSettings", mock.Anything).Return()

	h := newTestAIHandler(nil, nil, nil)
	h.legacyService = mockSvc

	h.SetFindingsManager(nil)
	h.SetMetadataUpdater(nil)
	h.UpdateControlSettings(nil)

	mockSvc.AssertExpectations(t)
}

func TestProviders(t *testing.T) {
	h := newTestAIHandler(nil, nil, nil)
	mockSvc := new(MockAIService)
	h.legacyService = mockSvc

	mockSvc.On("SetAlertProvider", mock.Anything).Return()
	mockSvc.On("SetFindingsProvider", mock.Anything).Return()
	mockSvc.On("SetBaselineProvider", mock.Anything).Return()
	mockSvc.On("SetPatternProvider", mock.Anything).Return()
	mockSvc.On("SetMetricsHistory", mock.Anything).Return()
	mockSvc.On("SetAgentProfileManager", mock.Anything).Return()
	mockSvc.On("SetStorageProvider", mock.Anything).Return()
	mockSvc.On("SetBackupProvider", mock.Anything).Return()
	mockSvc.On("SetDiskHealthProvider", mock.Anything).Return()
	mockSvc.On("SetUpdatesProvider", mock.Anything).Return()

	h.SetAlertProvider(nil)
	h.SetFindingsProvider(nil)
	h.SetBaselineProvider(nil)
	h.SetPatternProvider(nil)
	h.SetMetricsHistory(nil)
	h.SetAgentProfileManager(nil)
	h.SetStorageProvider(nil)
	h.SetBackupProvider(nil)
	h.SetDiskHealthProvider(nil)
	h.SetUpdatesProvider(nil)

	mockSvc.AssertExpectations(t)
}

func TestHandleAbort_Success(t *testing.T) {
	h := newTestAIHandler(&config.Config{}, nil, nil)
	mockSvc := new(MockAIService)
	h.legacyService = mockSvc
	mockSvc.On("IsRunning").Return(true)
	mockSvc.On("AbortSession", mock.Anything, "s1").Return(nil)

	req := httptest.NewRequest("POST", "/api/ai/sessions/s1/abort", nil)
	w := httptest.NewRecorder()
	h.HandleAbort(w, req, "s1")
	assert.Equal(t, http.StatusOK, w.Code)
}

func TestHandleSummarize_Success(t *testing.T) {
	h := newTestAIHandler(&config.Config{}, nil, nil)
	mockSvc := new(MockAIService)
	h.legacyService = mockSvc
	mockSvc.On("IsRunning").Return(true)
	mockSvc.On("SummarizeSession", mock.Anything, "s1").Return(map[string]interface{}{"summary": "ok"}, nil)

	req := httptest.NewRequest("POST", "/api/ai/sessions/s1/summarize", nil)
	w := httptest.NewRecorder()
	h.HandleSummarize(w, req, "s1")
	assert.Equal(t, http.StatusOK, w.Code)
}

func TestHandleDiff_Success(t *testing.T) {
	h := newTestAIHandler(&config.Config{}, nil, nil)
	mockSvc := new(MockAIService)
	h.legacyService = mockSvc
	mockSvc.On("IsRunning").Return(true)
	mockSvc.On("GetSessionDiff", mock.Anything, "s1").Return(map[string]interface{}{"diff": "test"}, nil)

	req := httptest.NewRequest("GET", "/api/ai/sessions/s1/diff", nil)
	w := httptest.NewRecorder()
	h.HandleDiff(w, req, "s1")
	assert.Equal(t, http.StatusOK, w.Code)
}

func TestHandleFork_Success(t *testing.T) {
	h := newTestAIHandler(&config.Config{}, nil, nil)
	mockSvc := new(MockAIService)
	h.legacyService = mockSvc
	mockSvc.On("IsRunning").Return(true)
	mockSvc.On("ForkSession", mock.Anything, "s1").Return(&chat.Session{ID: "s2"}, nil)

	req := httptest.NewRequest("POST", "/api/ai/sessions/s1/fork", nil)
	w := httptest.NewRecorder()
	h.HandleFork(w, req, "s1")
	assert.Equal(t, http.StatusOK, w.Code)
}

func TestHandleRevert_Success(t *testing.T) {
	h := newTestAIHandler(&config.Config{}, nil, nil)
	mockSvc := new(MockAIService)
	h.legacyService = mockSvc
	mockSvc.On("IsRunning").Return(true)
	mockSvc.On("RevertSession", mock.Anything, "s1").Return(map[string]interface{}{"reverted": true}, nil)

	req := httptest.NewRequest("POST", "/api/ai/sessions/s1/revert", nil)
	w := httptest.NewRecorder()
	h.HandleRevert(w, req, "s1")
	assert.Equal(t, http.StatusOK, w.Code)
}

func TestHandleUnrevert_Success(t *testing.T) {
	h := newTestAIHandler(&config.Config{}, nil, nil)
	mockSvc := new(MockAIService)
	h.legacyService = mockSvc
	mockSvc.On("IsRunning").Return(true)
	mockSvc.On("UnrevertSession", mock.Anything, "s1").Return(map[string]interface{}{"unreverted": true}, nil)

	req := httptest.NewRequest("POST", "/api/ai/sessions/s1/unrevert", nil)
	w := httptest.NewRecorder()
	h.HandleUnrevert(w, req, "s1")
	assert.Equal(t, http.StatusOK, w.Code)
}

func TestHandleStatus_NoService(t *testing.T) {
	// HandleStatus with no service initialized should still return 200 with running=false
	cfg := &config.Config{}
	h := newTestAIHandler(cfg, nil, nil)

	req := httptest.NewRequest("GET", "/api/ai/status", nil)
	w := httptest.NewRecorder()

	h.HandleStatus(w, req)

	assert.Equal(t, http.StatusOK, w.Code)
	var resp map[string]interface{}
	json.NewDecoder(w.Body).Decode(&resp)
	assert.False(t, resp["running"].(bool))
}

func TestGetService_MultiTenantInitAndCache(t *testing.T) {
	oldNewService := newChatService
	defer func() { newChatService = oldNewService }()

	tempDir := t.TempDir()
	mtp := config.NewMultiTenantPersistence(tempDir)
	h := NewAIHandler(mtp, nil, nil)

	mockSvc := new(MockAIService)
	mockSvc.On("Start", mock.Anything).Return(nil).Once()

	var gotCfg chat.Config
	newChatService = func(cfg chat.Config) AIService {
		gotCfg = cfg
		return mockSvc
	}

	ctx := context.WithValue(context.Background(), OrgIDContextKey, "acme")
	svc := h.GetService(ctx)
	assert.Same(t, mockSvc, svc)

	expectedDir := filepath.Join(tempDir, "orgs", "acme")
	assert.Equal(t, expectedDir, gotCfg.DataDir)
	assert.NotNil(t, gotCfg.AIConfig)

	// Second call should return cached service without re-starting
	svc = h.GetService(ctx)
	assert.Same(t, mockSvc, svc)

	mockSvc.AssertExpectations(t)
}

func TestRemoveTenantService(t *testing.T) {
	h := NewAIHandler(nil, nil, nil)
	mockSvc := new(MockAIService)
	mockSvc.On("Stop", mock.Anything).Return(assert.AnError).Once()
	h.services["acme"] = mockSvc

	err := h.RemoveTenantService(context.Background(), "acme")
	assert.NoError(t, err)
	_, exists := h.services["acme"]
	assert.False(t, exists)

	mockSvc.AssertExpectations(t)
}

func TestRemoveTenantService_DefaultNoop(t *testing.T) {
	h := NewAIHandler(nil, nil, nil)
	mockSvc := new(MockAIService)
	h.services["default"] = mockSvc

	err := h.RemoveTenantService(context.Background(), "default")
	assert.NoError(t, err)
	_, exists := h.services["default"]
	assert.True(t, exists)
}

func TestGetConfig_DefaultFallback(t *testing.T) {
	cfg := &config.Config{APIToken: "token"}
	h := newTestAIHandler(cfg, nil, nil)
	ctx := context.WithValue(context.Background(), OrgIDContextKey, "acme")

	result := h.getConfig(ctx)
	assert.Same(t, cfg, result)
}

func TestGetDataDirDefault(t *testing.T) {
	h := newTestAIHandler(nil, nil, nil)
	assert.Equal(t, "data", h.getDataDir(nil, ""))
	assert.Equal(t, "custom", h.getDataDir(nil, "custom"))
}

func TestSetMultiTenantPointers(t *testing.T) {
	h := NewAIHandler(nil, nil, nil)
	mtp := config.NewMultiTenantPersistence(t.TempDir())
	mtm := &monitoring.MultiTenantMonitor{}

	h.SetMultiTenantPersistence(mtp)
	h.SetMultiTenantMonitor(mtm)

	assert.Same(t, mtp, h.mtPersistence)
	assert.Same(t, mtm, h.mtMonitor)
}