package handlers_test

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

	"github.com/stretchr/testify/assert"
	"github.com/stretchr/testify/require"
	"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/handlers"
	"sneak.berlin/go/webhooker/internal/healthcheck"
	"sneak.berlin/go/webhooker/internal/logger"
	"sneak.berlin/go/webhooker/internal/session"
)

type noopNotifier struct{}

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

func newTestApp(
	t *testing.T,
	targets ...any,
) *fxtest.App {
	t.Helper()

	return 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{}
			},
			handlers.New,
		),
		fx.Populate(targets...),
	)
}

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

	var h *handlers.Handlers

	app := newTestApp(t, &h)
	app.RequireStart()

	t.Cleanup(app.RequireStop)

	req := httptest.NewRequestWithContext(
		context.Background(), 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"),
	)
}

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

	var h *handlers.Handlers

	var sess *session.Session

	app := newTestApp(t, &h, &sess)
	app.RequireStart()

	t.Cleanup(app.RequireStop)

	req := httptest.NewRequestWithContext(
		context.Background(), http.MethodGet, "/", nil)
	w := httptest.NewRecorder()

	s, err := sess.Get(req)
	require.NoError(t, err)

	sess.SetUser(s, "test-user-id", "testuser")

	err = sess.Save(req, w, s)
	require.NoError(t, err)

	req2 := httptest.NewRequestWithContext(
		context.Background(), http.MethodGet, "/", nil)

	for _, cookie := range w.Result().Cookies() {
		req2.AddCookie(cookie)
	}

	w2 := httptest.NewRecorder()
	h.HandleIndex().ServeHTTP(w2, req2)

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

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

	var h *handlers.Handlers

	app := newTestApp(t, &h)
	app.RequireStart()

	t.Cleanup(app.RequireStop)

	req := httptest.NewRequestWithContext(
		context.Background(), http.MethodPost, "/", nil)
	w := httptest.NewRecorder()

	cfg, err := h.BuildSlackTargetConfigForTest(
		w, req, "http://93.184.216.34/services/T00/B00/xxx",
	)

	require.NoError(t, err)
	assert.Equal(t, http.StatusOK, w.Code)
	assert.Contains(t, cfg, "webhookUrl")
}

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

	var h *handlers.Handlers

	app := newTestApp(t, &h)
	app.RequireStart()

	t.Cleanup(app.RequireStop)

	req := httptest.NewRequestWithContext(
		context.Background(), http.MethodPost, "/", nil)
	w := httptest.NewRecorder()

	cfg, err := h.BuildSlackTargetConfigForTest(
		w, req, "http://169.254.169.254/latest/meta-data/",
	)

	require.Error(t, err)
	assert.Empty(t, cfg)
	assert.Equal(t, http.StatusBadRequest, w.Code)
}

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

	var h *handlers.Handlers

	app := newTestApp(t, &h)
	app.RequireStart()

	t.Cleanup(app.RequireStop)

	req := httptest.NewRequestWithContext(
		context.Background(), http.MethodGet, "/", nil)
	w := httptest.NewRecorder()

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

	h.RenderTemplateForTest(
		w, req, "nonexistent.html", data,
	)

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

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

	var h *handlers.Handlers

	app := newTestApp(t, &h)
	app.RequireStart()

	t.Cleanup(app.RequireStop)

	// Empty expiry: the keep-forever default, empty config.
	w := httptest.NewRecorder()
	cfg, err := h.BuildDatabaseTargetConfigForTest(w, "")
	require.NoError(t, err)
	assert.Empty(t, cfg)

	// Explicit never is stored as config.
	w = httptest.NewRecorder()
	cfg, err = h.BuildDatabaseTargetConfigForTest(w, "never")
	require.NoError(t, err)
	assert.JSONEq(t, `{"expiry":"never"}`, cfg)

	// A positive duration is stored as config.
	w = httptest.NewRecorder()
	cfg, err = h.BuildDatabaseTargetConfigForTest(w, "720h")
	require.NoError(t, err)
	assert.JSONEq(t, `{"expiry":"720h"}`, cfg)
}

func TestBuildDatabaseTargetConfig_RejectsBadExpiry(
	t *testing.T,
) {
	t.Parallel()

	var h *handlers.Handlers

	app := newTestApp(t, &h)
	app.RequireStart()

	t.Cleanup(app.RequireStop)

	for _, bad := range []string{"nonsense", "7d", "-5h"} {
		w := httptest.NewRecorder()
		cfg, err := h.BuildDatabaseTargetConfigForTest(w, bad)

		require.Error(t, err, "expiry %q", bad)
		assert.Empty(t, cfg)
		assert.Equal(
			t, http.StatusBadRequest, w.Code,
			"expiry %q should be rejected with 400", bad,
		)
	}
}