package api

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

	"github.com/rcourtman/pulse-go-rewrite/internal/ai/chat"
	"github.com/rcourtman/pulse-go-rewrite/internal/config"
	"github.com/rcourtman/pulse-go-rewrite/internal/servicediscovery"
	"github.com/rcourtman/pulse-go-rewrite/internal/websocket"
	"github.com/rcourtman/pulse-go-rewrite/pkg/auth"
	"github.com/stretchr/testify/mock"
)

func TestRouteAISessions_NoSessionID(t *testing.T) {
	router := &Router{}
	req := httptest.NewRequest(http.MethodGet, "/api/ai/sessions/", nil)
	rec := httptest.NewRecorder()

	router.routeAISessions(rec, req)

	if rec.Code != http.StatusBadRequest {
		t.Fatalf("expected status %d, got %d", http.StatusBadRequest, rec.Code)
	}
}

func TestRouteAISessions_UnknownSubresource(t *testing.T) {
	router := &Router{}
	req := httptest.NewRequest(http.MethodGet, "/api/ai/sessions/session-1/unknown", nil)
	rec := httptest.NewRecorder()

	router.routeAISessions(rec, req)

	if rec.Code != http.StatusNotFound {
		t.Fatalf("expected status %d, got %d", http.StatusNotFound, rec.Code)
	}
}

func TestRouteAISessions_MethodNotAllowed(t *testing.T) {
	router := &Router{}
	req := httptest.NewRequest(http.MethodGet, "/api/ai/sessions/session-1", nil)
	rec := httptest.NewRecorder()

	router.routeAISessions(rec, req)

	if rec.Code != http.StatusMethodNotAllowed {
		t.Fatalf("expected status %d, got %d", http.StatusMethodNotAllowed, rec.Code)
	}
}

func TestRouteAISessions_Messages(t *testing.T) {
	mockSvc := &MockAIService{}
	mockSvc.On("IsRunning").Return(true)
	mockSvc.On("GetMessages", mock.Anything, "session-1").Return([]chat.Message{}, nil)

	handler := &AIHandler{}
	setUnexportedField(t, handler, "legacyService", mockSvc)

	router := &Router{aiHandler: handler}
	req := httptest.NewRequest(http.MethodGet, "/api/ai/sessions/session-1/messages", nil)
	rec := httptest.NewRecorder()

	router.routeAISessions(rec, req)

	if rec.Code != http.StatusOK {
		t.Fatalf("expected status %d, got %d", http.StatusOK, rec.Code)
	}
	if ct := rec.Header().Get("Content-Type"); !strings.Contains(ct, "application/json") {
		t.Fatalf("expected application/json, got %q", ct)
	}
	var payload []chat.Message
	if err := json.NewDecoder(rec.Body).Decode(&payload); err != nil {
		t.Fatalf("failed to decode response: %v", err)
	}
	mockSvc.AssertExpectations(t)
}

func TestRouteAISessions_DeleteSession(t *testing.T) {
	mockSvc := &MockAIService{}
	mockSvc.On("IsRunning").Return(true)
	mockSvc.On("DeleteSession", mock.Anything, "session-1").Return(nil)

	handler := &AIHandler{}
	setUnexportedField(t, handler, "legacyService", mockSvc)

	router := &Router{aiHandler: handler}
	req := httptest.NewRequest(http.MethodDelete, "/api/ai/sessions/session-1", nil)
	rec := httptest.NewRecorder()

	router.routeAISessions(rec, req)

	if rec.Code != http.StatusNoContent {
		t.Fatalf("expected status %d, got %d", http.StatusNoContent, rec.Code)
	}
	mockSvc.AssertExpectations(t)
}

func TestRouteAISessions_Abort(t *testing.T) {
	mockSvc := &MockAIService{}
	mockSvc.On("IsRunning").Return(true)
	mockSvc.On("AbortSession", mock.Anything, "session-1").Return(nil)

	handler := &AIHandler{}
	setUnexportedField(t, handler, "legacyService", mockSvc)

	router := &Router{aiHandler: handler}
	req := httptest.NewRequest(http.MethodPost, "/api/ai/sessions/session-1/abort", nil)
	rec := httptest.NewRecorder()

	router.routeAISessions(rec, req)

	if rec.Code != http.StatusOK {
		t.Fatalf("expected status %d, got %d", http.StatusOK, rec.Code)
	}
	mockSvc.AssertExpectations(t)
}

func TestRouteAISessions_Summarize(t *testing.T) {
	mockSvc := &MockAIService{}
	mockSvc.On("IsRunning").Return(true)
	mockSvc.On("SummarizeSession", mock.Anything, "session-1").Return(map[string]interface{}{"summary": "ok"}, nil)

	handler := &AIHandler{}
	setUnexportedField(t, handler, "legacyService", mockSvc)

	router := &Router{aiHandler: handler}
	req := httptest.NewRequest(http.MethodPost, "/api/ai/sessions/session-1/summarize", nil)
	rec := httptest.NewRecorder()

	router.routeAISessions(rec, req)

	if rec.Code != http.StatusOK {
		t.Fatalf("expected status %d, got %d", http.StatusOK, rec.Code)
	}
	mockSvc.AssertExpectations(t)
}

func TestRouteAISessions_Diff(t *testing.T) {
	mockSvc := &MockAIService{}
	mockSvc.On("IsRunning").Return(true)
	mockSvc.On("GetSessionDiff", mock.Anything, "session-1").Return(map[string]interface{}{"diff": "ok"}, nil)

	handler := &AIHandler{}
	setUnexportedField(t, handler, "legacyService", mockSvc)

	router := &Router{aiHandler: handler}
	req := httptest.NewRequest(http.MethodGet, "/api/ai/sessions/session-1/diff", nil)
	rec := httptest.NewRecorder()

	router.routeAISessions(rec, req)

	if rec.Code != http.StatusOK {
		t.Fatalf("expected status %d, got %d", http.StatusOK, rec.Code)
	}
	mockSvc.AssertExpectations(t)
}

func TestRouteAISessions_Fork(t *testing.T) {
	mockSvc := &MockAIService{}
	mockSvc.On("IsRunning").Return(true)
	mockSvc.On("ForkSession", mock.Anything, "session-1").Return(&chat.Session{ID: "forked-1"}, nil)

	handler := &AIHandler{}
	setUnexportedField(t, handler, "legacyService", mockSvc)

	router := &Router{aiHandler: handler}
	req := httptest.NewRequest(http.MethodPost, "/api/ai/sessions/session-1/fork", nil)
	rec := httptest.NewRecorder()

	router.routeAISessions(rec, req)

	if rec.Code != http.StatusOK {
		t.Fatalf("expected status %d, got %d", http.StatusOK, rec.Code)
	}
	mockSvc.AssertExpectations(t)
}

func TestRouteAISessions_Revert(t *testing.T) {
	mockSvc := &MockAIService{}
	mockSvc.On("IsRunning").Return(true)
	mockSvc.On("RevertSession", mock.Anything, "session-1").Return(map[string]interface{}{"reverted": true}, nil)

	handler := &AIHandler{}
	setUnexportedField(t, handler, "legacyService", mockSvc)

	router := &Router{aiHandler: handler}
	req := httptest.NewRequest(http.MethodPost, "/api/ai/sessions/session-1/revert", nil)
	rec := httptest.NewRecorder()

	router.routeAISessions(rec, req)

	if rec.Code != http.StatusOK {
		t.Fatalf("expected status %d, got %d", http.StatusOK, rec.Code)
	}
	mockSvc.AssertExpectations(t)
}

func TestRouteAISessions_Unrevert(t *testing.T) {
	mockSvc := &MockAIService{}
	mockSvc.On("IsRunning").Return(true)
	mockSvc.On("UnrevertSession", mock.Anything, "session-1").Return(map[string]interface{}{"unreverted": true}, nil)

	handler := &AIHandler{}
	setUnexportedField(t, handler, "legacyService", mockSvc)

	router := &Router{aiHandler: handler}
	req := httptest.NewRequest(http.MethodPost, "/api/ai/sessions/session-1/unrevert", nil)
	rec := httptest.NewRecorder()

	router.routeAISessions(rec, req)

	if rec.Code != http.StatusOK {
		t.Fatalf("expected status %d, got %d", http.StatusOK, rec.Code)
	}
	mockSvc.AssertExpectations(t)
}

func TestRouteApprovals_MissingID(t *testing.T) {
	router := &Router{}
	req := httptest.NewRequest(http.MethodGet, "/api/ai/approvals/", nil)
	rec := httptest.NewRecorder()

	router.routeApprovals(rec, req)

	if rec.Code != http.StatusBadRequest {
		t.Fatalf("expected status %d, got %d", http.StatusBadRequest, rec.Code)
	}
}

func TestRouteApprovals_UnknownAction(t *testing.T) {
	router := &Router{}
	req := httptest.NewRequest(http.MethodPost, "/api/ai/approvals/abc/unknown", nil)
	rec := httptest.NewRecorder()

	router.routeApprovals(rec, req)

	if rec.Code != http.StatusNotFound {
		t.Fatalf("expected status %d, got %d", http.StatusNotFound, rec.Code)
	}
}

func TestRouteApprovals_MethodNotAllowed(t *testing.T) {
	router := &Router{}
	req := httptest.NewRequest(http.MethodPost, "/api/ai/approvals/abc", nil)
	rec := httptest.NewRecorder()

	router.routeApprovals(rec, req)

	if rec.Code != http.StatusMethodNotAllowed {
		t.Fatalf("expected status %d, got %d", http.StatusMethodNotAllowed, rec.Code)
	}
}

func TestRouteQuestions_MissingID(t *testing.T) {
	router := &Router{}
	req := httptest.NewRequest(http.MethodPost, "/api/ai/question/", nil)
	rec := httptest.NewRecorder()

	router.routeQuestions(rec, req)

	if rec.Code != http.StatusBadRequest {
		t.Fatalf("expected status %d, got %d", http.StatusBadRequest, rec.Code)
	}
}

func TestRouteQuestions_MethodNotAllowed(t *testing.T) {
	router := &Router{}
	req := httptest.NewRequest(http.MethodGet, "/api/ai/question/q1/answer", nil)
	rec := httptest.NewRecorder()

	router.routeQuestions(rec, req)

	if rec.Code != http.StatusMethodNotAllowed {
		t.Fatalf("expected status %d, got %d", http.StatusMethodNotAllowed, rec.Code)
	}
}

func TestRouteQuestions_NotFound(t *testing.T) {
	router := &Router{}
	req := httptest.NewRequest(http.MethodPost, "/api/ai/question/q1/unknown", nil)
	rec := httptest.NewRecorder()

	router.routeQuestions(rec, req)

	if rec.Code != http.StatusNotFound {
		t.Fatalf("expected status %d, got %d", http.StatusNotFound, rec.Code)
	}
}

func TestHandleAgentWebSocket_Unavailable(t *testing.T) {
	router := &Router{}
	req := httptest.NewRequest(http.MethodGet, "/ws/agent", nil)
	rec := httptest.NewRecorder()

	router.handleAgentWebSocket(rec, req)

	if rec.Code != http.StatusServiceUnavailable {
		t.Fatalf("expected status %d, got %d", http.StatusServiceUnavailable, rec.Code)
	}
}

func TestHandleVerifyTemperatureSSH_ServiceUnavailable(t *testing.T) {
	router := &Router{}
	req := httptest.NewRequest(http.MethodPost, "/api/system/verify-temperature-ssh", nil)
	rec := httptest.NewRecorder()

	router.handleVerifyTemperatureSSH(rec, req)

	if rec.Code != http.StatusServiceUnavailable {
		t.Fatalf("expected status %d, got %d", http.StatusServiceUnavailable, rec.Code)
	}
}

func TestHandleVerifyTemperatureSSH_Unauthorized(t *testing.T) {
	hash, err := auth.HashPassword("secret")
	if err != nil {
		t.Fatalf("hash password: %v", err)
	}

	router := &Router{
		config:         &config.Config{AuthUser: "admin", AuthPass: hash},
		configHandlers: &ConfigHandlers{},
	}

	req := httptest.NewRequest(http.MethodPost, "/api/system/verify-temperature-ssh", nil)
	rec := httptest.NewRecorder()

	router.handleVerifyTemperatureSSH(rec, req)

	if rec.Code != http.StatusUnauthorized {
		t.Fatalf("expected status %d, got %d", http.StatusUnauthorized, rec.Code)
	}
	if ct := rec.Header().Get("Content-Type"); !strings.Contains(ct, "application/json") {
		t.Fatalf("expected application/json, got %q", ct)
	}
}

func TestHandleSSHConfig_ServiceUnavailable(t *testing.T) {
	router := &Router{}
	req := httptest.NewRequest(http.MethodPost, "/api/system/ssh-config", nil)
	rec := httptest.NewRecorder()

	router.handleSSHConfig(rec, req)

	if rec.Code != http.StatusServiceUnavailable {
		t.Fatalf("expected status %d, got %d", http.StatusServiceUnavailable, rec.Code)
	}
}

func TestHandleSSHConfig_Unauthorized(t *testing.T) {
	hash, err := auth.HashPassword("secret")
	if err != nil {
		t.Fatalf("hash password: %v", err)
	}

	router := &Router{
		config:                &config.Config{AuthUser: "admin", AuthPass: hash},
		systemSettingsHandler: &SystemSettingsHandler{},
	}

	req := httptest.NewRequest(http.MethodPost, "/api/system/ssh-config", nil)
	rec := httptest.NewRecorder()

	router.handleSSHConfig(rec, req)

	if rec.Code != http.StatusUnauthorized {
		t.Fatalf("expected status %d, got %d", http.StatusUnauthorized, rec.Code)
	}
	if ct := rec.Header().Get("Content-Type"); !strings.Contains(ct, "application/json") {
		t.Fatalf("expected application/json, got %q", ct)
	}
}

func TestRouterAIChatControl(t *testing.T) {
	t.Run("nil handler", func(t *testing.T) {
		router := &Router{}
		router.StopAIChat(context.Background())
		router.RestartAIChat(context.Background())
	})

	t.Run("calls through to ai handler", func(t *testing.T) {
		mockSvc := &MockAIService{}
		mockSvc.On("Stop", mock.Anything).Return(nil)
		mockSvc.On("IsRunning").Return(true)
		mockSvc.On("Restart", mock.Anything, mock.Anything).Return(nil)

		handler := &AIHandler{}
		setUnexportedField(t, handler, "legacyService", mockSvc)

		router := &Router{aiHandler: handler}
		router.StopAIChat(context.Background())
		router.RestartAIChat(context.Background())

		mockSvc.AssertExpectations(t)
	})
}

func TestSetDiscoveryService(t *testing.T) {
	service := servicediscovery.NewService(nil, nil, nil, servicediscovery.Config{})
	handlers := &DiscoveryHandlers{}

	router := &Router{
		discoveryHandlers: handlers,
		wsHub:             &websocket.Hub{},
	}

	router.SetDiscoveryService(service)

	if handlers.service != service {
		t.Fatalf("expected discovery service to be set")
	}
}

func TestWsHubAdapter_BroadcastDiscoveryProgress(t *testing.T) {
	hub := &websocket.Hub{}
	broadcast := make(chan []byte, 1)
	setUnexportedField(t, hub, "broadcast", broadcast)

	adapter := &wsHubAdapter{hub: hub}
	progress := &servicediscovery.DiscoveryProgress{
		ResourceID:     "res-1",
		Status:         servicediscovery.DiscoveryStatusRunning,
		CurrentStep:    "scan",
		TotalSteps:     3,
		CompletedSteps: 1,
		StartedAt:      time.Now(),
	}

	adapter.BroadcastDiscoveryProgress(progress)

	select {
	case msg := <-broadcast:
		if !strings.Contains(string(msg), "ai_discovery_progress") {
			t.Fatalf("expected discovery progress message, got %s", string(msg))
		}
	default:
		t.Fatalf("expected broadcast message")
	}
}