package handlers

import (
	"net/http"
	"net/http/httptest"
	"testing"

	"github.com/stretchr/testify/assert"
	"go.uber.org/fx"
	"go.uber.org/fx/fxtest"
	"sneak.berlin/go/webhooker/internal/config"
	"sneak.berlin/go/webhooker/internal/database"
	"sneak.berlin/go/webhooker/internal/delivery"
	"sneak.berlin/go/webhooker/internal/globals"
	"sneak.berlin/go/webhooker/internal/healthcheck"
	"sneak.berlin/go/webhooker/internal/logger"
	"sneak.berlin/go/webhooker/internal/session"
)

// noopNotifier is a no-op delivery.Notifier for tests.
type noopNotifier struct{}

func (n *noopNotifier) Notify([]delivery.DeliveryTask) {}

func TestHandleIndex(t *testing.T) {
	var h *Handlers
	var sess *session.Session

	app := fxtest.New(
		t,
		fx.Provide(
			globals.New,
			logger.New,
			func() *config.Config {
				return &config.Config{
					DataDir: t.TempDir(),
				}
			},
			database.New,
			database.NewWebhookDBManager,
			healthcheck.New,
			session.New,
			func() delivery.Notifier { return &noopNotifier{} },
			New,
		),
		fx.Populate(&h, &sess),
	)
	app.RequireStart()
	defer app.RequireStop()

	t.Run("unauthenticated redirects to login", func(t *testing.T) {
		req := httptest.NewRequest(http.MethodGet, "/", nil)
		w := httptest.NewRecorder()

		handler := h.HandleIndex()
		handler.ServeHTTP(w, req)

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

	t.Run("authenticated redirects to sources", func(t *testing.T) {
		// Create a request, set up an authenticated session, then test
		req := httptest.NewRequest(http.MethodGet, "/", nil)
		w := httptest.NewRecorder()

		// Get a session and mark it as authenticated
		s, err := sess.Get(req)
		assert.NoError(t, err)
		sess.SetUser(s, "test-user-id", "testuser")
		err = sess.Save(req, w, s)
		assert.NoError(t, err)

		// Build a new request with the session cookie from the response
		req2 := httptest.NewRequest(http.MethodGet, "/", nil)
		for _, cookie := range w.Result().Cookies() {
			req2.AddCookie(cookie)
		}
		w2 := httptest.NewRecorder()

		handler := h.HandleIndex()
		handler.ServeHTTP(w2, req2)

		assert.Equal(t, http.StatusSeeOther, w2.Code)
		assert.Equal(t, "/sources", w2.Header().Get("Location"))
	})
}

func TestRenderTemplate(t *testing.T) {
	var h *Handlers

	app := fxtest.New(
		t,
		fx.Provide(
			globals.New,
			logger.New,
			func() *config.Config {
				return &config.Config{
					DataDir: t.TempDir(),
				}
			},
			database.New,
			database.NewWebhookDBManager,
			healthcheck.New,
			session.New,
			func() delivery.Notifier { return &noopNotifier{} },
			New,
		),
		fx.Populate(&h),
	)
	app.RequireStart()
	defer app.RequireStop()

	t.Run("handles missing templates gracefully", func(t *testing.T) {
		req := httptest.NewRequest(http.MethodGet, "/", nil)
		w := httptest.NewRecorder()

		data := map[string]interface{}{
			"Version": "1.0.0",
		}

		// When a non-existent template name is requested, renderTemplate
		// should return an internal server error
		h.renderTemplate(w, req, "nonexistent.html", data)

		// Should return internal server error when template is not found
		assert.Equal(t, http.StatusInternalServerError, w.Code)
	})
}