package handlers_test

import (
	"context"
	"net/http"
	"net/http/httptest"
	"net/url"
	"strings"
	"testing"

	"github.com/go-chi/chi/v5"
	"github.com/stretchr/testify/assert"
	"github.com/stretchr/testify/require"
	"go.uber.org/fx"

	"git.eeqj.de/sneak/upaas/internal/config"
	"git.eeqj.de/sneak/upaas/internal/database"
	"git.eeqj.de/sneak/upaas/internal/docker"
	"git.eeqj.de/sneak/upaas/internal/globals"
	"git.eeqj.de/sneak/upaas/internal/handlers"
	"git.eeqj.de/sneak/upaas/internal/healthcheck"
	"git.eeqj.de/sneak/upaas/internal/logger"
	"git.eeqj.de/sneak/upaas/internal/service/app"
	"git.eeqj.de/sneak/upaas/internal/service/auth"
	"git.eeqj.de/sneak/upaas/internal/service/deploy"
	"git.eeqj.de/sneak/upaas/internal/service/notify"
	"git.eeqj.de/sneak/upaas/internal/service/webhook"
)

type testContext struct {
	handlers *handlers.Handlers
	database *database.Database
	authSvc  *auth.Service
	appSvc   *app.Service
}

func createTestConfig(t *testing.T) *config.Config {
	t.Helper()

	return &config.Config{
		Port:          8080,
		DataDir:       t.TempDir(),
		SessionSecret: "test-secret-key-at-least-32-characters-long",
	}
}

func createCoreServices(
	t *testing.T,
	cfg *config.Config,
) (*globals.Globals, *logger.Logger, *database.Database, *healthcheck.Healthcheck) {
	t.Helper()

	globals.SetAppname("upaas-test")
	globals.SetVersion("test")

	globalInstance, globErr := globals.New(fx.Lifecycle(nil))
	require.NoError(t, globErr)

	logInstance, logErr := logger.New(
		fx.Lifecycle(nil),
		logger.Params{Globals: globalInstance},
	)
	require.NoError(t, logErr)

	dbInstance, dbErr := database.New(fx.Lifecycle(nil), database.Params{
		Logger: logInstance,
		Config: cfg,
	})
	require.NoError(t, dbErr)

	hcInstance, hcErr := healthcheck.New(
		fx.Lifecycle(nil),
		healthcheck.Params{
			Logger:  logInstance,
			Globals: globalInstance,
			Config:  cfg,
		},
	)
	require.NoError(t, hcErr)

	return globalInstance, logInstance, dbInstance, hcInstance
}

func createAppServices(
	t *testing.T,
	logInstance *logger.Logger,
	dbInstance *database.Database,
	cfg *config.Config,
) (*auth.Service, *app.Service, *deploy.Service, *webhook.Service) {
	t.Helper()

	authSvc, authErr := auth.New(fx.Lifecycle(nil), auth.ServiceParams{
		Logger:   logInstance,
		Config:   cfg,
		Database: dbInstance,
	})
	require.NoError(t, authErr)

	appSvc, appErr := app.New(fx.Lifecycle(nil), app.ServiceParams{
		Logger:   logInstance,
		Database: dbInstance,
	})
	require.NoError(t, appErr)

	dockerClient, dockerErr := docker.New(fx.Lifecycle(nil), docker.Params{
		Logger: logInstance,
		Config: cfg,
	})
	require.NoError(t, dockerErr)

	notifySvc, notifyErr := notify.New(fx.Lifecycle(nil), notify.ServiceParams{
		Logger: logInstance,
	})
	require.NoError(t, notifyErr)

	deploySvc, deployErr := deploy.New(fx.Lifecycle(nil), deploy.ServiceParams{
		Logger:   logInstance,
		Database: dbInstance,
		Docker:   dockerClient,
		Notify:   notifySvc,
	})
	require.NoError(t, deployErr)

	webhookSvc, webhookErr := webhook.New(fx.Lifecycle(nil), webhook.ServiceParams{
		Logger:   logInstance,
		Database: dbInstance,
		Deploy:   deploySvc,
	})
	require.NoError(t, webhookErr)

	return authSvc, appSvc, deploySvc, webhookSvc
}

func setupTestHandlers(t *testing.T) *testContext {
	t.Helper()

	cfg := createTestConfig(t)

	globalInstance, logInstance, dbInstance, hcInstance := createCoreServices(t, cfg)

	authSvc, appSvc, deploySvc, webhookSvc := createAppServices(
		t,
		logInstance,
		dbInstance,
		cfg,
	)

	handlersInstance, handlerErr := handlers.New(
		fx.Lifecycle(nil),
		handlers.Params{
			Logger:      logInstance,
			Globals:     globalInstance,
			Database:    dbInstance,
			Healthcheck: hcInstance,
			Auth:        authSvc,
			App:         appSvc,
			Deploy:      deploySvc,
			Webhook:     webhookSvc,
		},
	)
	require.NoError(t, handlerErr)

	return &testContext{
		handlers: handlersInstance,
		database: dbInstance,
		authSvc:  authSvc,
		appSvc:   appSvc,
	}
}

func TestHandleHealthCheck(t *testing.T) {
	t.Parallel()

	t.Run("returns health check response", func(t *testing.T) {
		t.Parallel()

		testCtx := setupTestHandlers(t)

		request := httptest.NewRequest(
			http.MethodGet,
			"/.well-known/healthcheck.json",
			nil,
		)
		recorder := httptest.NewRecorder()

		handler := testCtx.handlers.HandleHealthCheck()
		handler.ServeHTTP(recorder, request)

		assert.Equal(t, http.StatusOK, recorder.Code)
		assert.Contains(t, recorder.Header().Get("Content-Type"), "application/json")
		assert.Contains(t, recorder.Body.String(), "status")
		assert.Contains(t, recorder.Body.String(), "ok")
	})
}

func TestHandleSetupGET(t *testing.T) {
	t.Parallel()

	t.Run("renders setup page", func(t *testing.T) {
		t.Parallel()

		testCtx := setupTestHandlers(t)

		request := httptest.NewRequest(http.MethodGet, "/setup", nil)
		recorder := httptest.NewRecorder()

		handler := testCtx.handlers.HandleSetupGET()
		handler.ServeHTTP(recorder, request)

		assert.Equal(t, http.StatusOK, recorder.Code)
		assert.Contains(t, recorder.Body.String(), "setup")
	})
}

func createSetupFormRequest(
	username, password, confirm string,
) *http.Request {
	form := url.Values{}
	form.Set("username", username)
	form.Set("password", password)
	form.Set("password_confirm", confirm)

	request := httptest.NewRequest(
		http.MethodPost,
		"/setup",
		strings.NewReader(form.Encode()),
	)
	request.Header.Set("Content-Type", "application/x-www-form-urlencoded")

	return request
}

func TestHandleSetupPOSTCreatesUserAndRedirects(t *testing.T) {
	t.Parallel()

	testCtx := setupTestHandlers(t)

	request := createSetupFormRequest("admin", "password123", "password123")
	recorder := httptest.NewRecorder()

	handler := testCtx.handlers.HandleSetupPOST()
	handler.ServeHTTP(recorder, request)

	assert.Equal(t, http.StatusSeeOther, recorder.Code)
	assert.Equal(t, "/", recorder.Header().Get("Location"))
}

func TestHandleSetupPOSTRejectsEmptyUsername(t *testing.T) {
	t.Parallel()

	testCtx := setupTestHandlers(t)

	request := createSetupFormRequest("", "password123", "password123")
	recorder := httptest.NewRecorder()

	handler := testCtx.handlers.HandleSetupPOST()
	handler.ServeHTTP(recorder, request)

	assert.Equal(t, http.StatusOK, recorder.Code)
	assert.Contains(t, recorder.Body.String(), "required")
}

func TestHandleSetupPOSTRejectsShortPassword(t *testing.T) {
	t.Parallel()

	testCtx := setupTestHandlers(t)

	request := createSetupFormRequest("admin", "short", "short")
	recorder := httptest.NewRecorder()

	handler := testCtx.handlers.HandleSetupPOST()
	handler.ServeHTTP(recorder, request)

	assert.Equal(t, http.StatusOK, recorder.Code)
	assert.Contains(t, recorder.Body.String(), "8 characters")
}

func TestHandleSetupPOSTRejectsMismatchedPasswords(t *testing.T) {
	t.Parallel()

	testCtx := setupTestHandlers(t)

	request := createSetupFormRequest("admin", "password123", "different123")
	recorder := httptest.NewRecorder()

	handler := testCtx.handlers.HandleSetupPOST()
	handler.ServeHTTP(recorder, request)

	assert.Equal(t, http.StatusOK, recorder.Code)
	assert.Contains(t, recorder.Body.String(), "do not match")
}

func TestHandleLoginGET(t *testing.T) {
	t.Parallel()

	t.Run("renders login page", func(t *testing.T) {
		t.Parallel()

		testCtx := setupTestHandlers(t)

		request := httptest.NewRequest(http.MethodGet, "/login", nil)
		recorder := httptest.NewRecorder()

		handler := testCtx.handlers.HandleLoginGET()
		handler.ServeHTTP(recorder, request)

		assert.Equal(t, http.StatusOK, recorder.Code)
		assert.Contains(t, recorder.Body.String(), "login")
	})
}

func createLoginFormRequest(username, password string) *http.Request {
	form := url.Values{}
	form.Set("username", username)
	form.Set("password", password)

	request := httptest.NewRequest(
		http.MethodPost,
		"/login",
		strings.NewReader(form.Encode()),
	)
	request.Header.Set("Content-Type", "application/x-www-form-urlencoded")

	return request
}

func TestHandleLoginPOSTAuthenticatesValidCredentials(t *testing.T) {
	t.Parallel()

	testCtx := setupTestHandlers(t)

	// Create user first
	_, createErr := testCtx.authSvc.CreateUser(
		context.Background(),
		"testuser",
		"testpass123",
	)
	require.NoError(t, createErr)

	request := createLoginFormRequest("testuser", "testpass123")
	recorder := httptest.NewRecorder()

	handler := testCtx.handlers.HandleLoginPOST()
	handler.ServeHTTP(recorder, request)

	assert.Equal(t, http.StatusSeeOther, recorder.Code)
	assert.Equal(t, "/", recorder.Header().Get("Location"))
}

func TestHandleLoginPOSTRejectsInvalidCredentials(t *testing.T) {
	t.Parallel()

	testCtx := setupTestHandlers(t)

	// Create user first
	_, createErr := testCtx.authSvc.CreateUser(
		context.Background(),
		"testuser",
		"testpass123",
	)
	require.NoError(t, createErr)

	request := createLoginFormRequest("testuser", "wrongpassword")
	recorder := httptest.NewRecorder()

	handler := testCtx.handlers.HandleLoginPOST()
	handler.ServeHTTP(recorder, request)

	assert.Equal(t, http.StatusOK, recorder.Code)
	assert.Contains(t, recorder.Body.String(), "Invalid")
}

func TestHandleDashboard(t *testing.T) {
	t.Parallel()

	t.Run("renders dashboard with app list", func(t *testing.T) {
		t.Parallel()

		testCtx := setupTestHandlers(t)

		request := httptest.NewRequest(http.MethodGet, "/", nil)
		recorder := httptest.NewRecorder()

		handler := testCtx.handlers.HandleDashboard()
		handler.ServeHTTP(recorder, request)

		assert.Equal(t, http.StatusOK, recorder.Code)
		assert.Contains(t, recorder.Body.String(), "Applications")
	})
}

func TestHandleAppNew(t *testing.T) {
	t.Parallel()

	t.Run("renders new app form", func(t *testing.T) {
		t.Parallel()

		testCtx := setupTestHandlers(t)

		request := httptest.NewRequest(http.MethodGet, "/apps/new", nil)
		recorder := httptest.NewRecorder()

		handler := testCtx.handlers.HandleAppNew()
		handler.ServeHTTP(recorder, request)

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

// addChiURLParams adds chi URL parameters to a request for testing.
func addChiURLParams(
	request *http.Request,
	params map[string]string,
) *http.Request {
	routeContext := chi.NewRouteContext()

	for key, value := range params {
		routeContext.URLParams.Add(key, value)
	}

	return request.WithContext(
		context.WithValue(request.Context(), chi.RouteCtxKey, routeContext),
	)
}

func TestHandleWebhookReturns404ForUnknownSecret(t *testing.T) {
	t.Parallel()

	testCtx := setupTestHandlers(t)

	webhookURL := "/webhook/unknown-secret"
	payload := `{"ref": "refs/heads/main"}`
	request := httptest.NewRequest(
		http.MethodPost,
		webhookURL,
		strings.NewReader(payload),
	)
	request = addChiURLParams(request, map[string]string{"secret": "unknown-secret"})
	request.Header.Set("Content-Type", "application/json")
	request.Header.Set("X-Gitea-Event", "push")

	recorder := httptest.NewRecorder()

	handler := testCtx.handlers.HandleWebhook()
	handler.ServeHTTP(recorder, request)

	assert.Equal(t, http.StatusNotFound, recorder.Code)
}

func TestHandleWebhookProcessesValidWebhook(t *testing.T) {
	t.Parallel()

	testCtx := setupTestHandlers(t)

	// Create an app first
	createdApp, createErr := testCtx.appSvc.CreateApp(
		context.Background(),
		app.CreateAppInput{
			Name:    "webhook-test-app",
			RepoURL: "git@example.com:user/repo.git",
			Branch:  "main",
		},
	)
	require.NoError(t, createErr)

	payload := `{"ref": "refs/heads/main", "after": "abc123"}`
	webhookURL := "/webhook/" + createdApp.WebhookSecret
	request := httptest.NewRequest(
		http.MethodPost,
		webhookURL,
		strings.NewReader(payload),
	)
	request = addChiURLParams(
		request,
		map[string]string{"secret": createdApp.WebhookSecret},
	)
	request.Header.Set("Content-Type", "application/json")
	request.Header.Set("X-Gitea-Event", "push")

	recorder := httptest.NewRecorder()

	handler := testCtx.handlers.HandleWebhook()
	handler.ServeHTTP(recorder, request)

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