//go:build integration

package integration_test

import (
	"context"
	"encoding/json"
	"fmt"
	"io"
	"log/slog"
	"net/http"
	"net/http/httptest"
	"strings"
	"sync/atomic"
	"testing"
	"time"

	"github.com/google/uuid"

	"github.com/alchemistkay/guestguard/internal/api"
	"github.com/alchemistkay/guestguard/internal/natspub"
	"github.com/alchemistkay/guestguard/internal/storage"
)

// TestTokenIssuePublishesInvitation walks the new wire-up: issuing a
// token for a guest with an email-on-file should publish an
// invitation.send event over NATS, and the API response should reflect
// that the invitation was queued.
func TestTokenIssuePublishesInvitation(t *testing.T) {
	if testing.Short() {
		t.Skip("skipping integration test in -short mode")
	}

	ctx, cancel := context.WithTimeout(context.Background(), 3*time.Minute)
	t.Cleanup(cancel)
	logger := slog.New(slog.NewTextHandler(io.Discard, nil))

	dsn := startPostgres(t, ctx)
	natsURL := startNATS(t, ctx)

	db, err := storage.NewDB(ctx, dsn)
	must(t, err, "connect db")
	t.Cleanup(db.Close)
	must(t, db.Migrate(ctx), "migrate")

	natsClient, err := natspub.Connect(ctx, natsURL, logger)
	must(t, err, "connect nats")
	t.Cleanup(natsClient.Close)

	// Subscribe before issuing — JetStream replay is on by default but
	// this guarantees we don't race the consumer setup.
	var seen atomic.Int32
	captured := make(chan natspub.InvitationSend, 1)
	sub, err := natspub.NewInvitationSendSubscriber(ctx, natsClient, "test-invitation-send",
		func(ctx context.Context, evt natspub.InvitationSend) error {
			seen.Add(1)
			select {
			case captured <- evt:
			default:
			}
			return nil
		}, logger)
	must(t, err, "build subscriber")
	cc, err := sub.Start(ctx)
	must(t, err, "start subscriber")
	t.Cleanup(cc.Stop)

	apiSrv, err := api.NewServer(api.ServerDeps{
		Logger:               logger,
		DB:                   db,
		AccessPublisher:      natsClient,
		RSVPPublisher:        natsClient,
		InvitationPublisher:  natsClient,
		TokenTTL:             24 * time.Hour,
		JWTSecret:            testJWTSecret,
		JWTIssuer:            testJWTIssuer,
		AccessTokenTTL:       5 * time.Minute,
		RefreshTokenTTL:      24 * time.Hour,
		EmailVerificationTTL: 1 * time.Hour,
		PasswordResetTTL:     1 * time.Hour,
		PublicBaseURL:        "https://gg.example.test",
	})
	must(t, err, "build api server")
	srv := httptest.NewServer(apiSrv.Handler())
	t.Cleanup(srv.Close)

	hostID := insertHost(t, ctx, db.Pool)
	token := issueHostToken(t, hostID)

	eventID := createEvent(t, srv.URL, token, "Invitation Test", "invitation-test")
	guestID, guestEmail := createGuestWithEmail(t, srv.URL, token, eventID, "Mira")

	var issued struct {
		Token            string `json:"token"`
		InvitationQueued bool   `json:"invitation_queued"`
		InvitationLink   string `json:"invitation_link"`
	}
	postJSONAuthed(t,
		fmt.Sprintf("%s/events/%s/guests/%s/tokens", srv.URL, eventID, guestID),
		token, nil, http.StatusCreated, &issued)

	if !issued.InvitationQueued {
		t.Fatalf("expected invitation_queued=true (response: %+v)", issued)
	}
	if !strings.HasPrefix(issued.InvitationLink, "https://gg.example.test/rsvp/tk_") {
		t.Fatalf("invitation_link should use publicBaseURL: got %q", issued.InvitationLink)
	}

	select {
	case evt := <-captured:
		if evt.GuestID.String() != guestID.String() {
			t.Errorf("guest id: got %s want %s", evt.GuestID, guestID)
		}
		if evt.GuestEmail != guestEmail {
			t.Errorf("guest email: got %s want %s", evt.GuestEmail, guestEmail)
		}
		if evt.EventName != "Invitation Test" {
			t.Errorf("event name: got %s", evt.EventName)
		}
		if !strings.HasPrefix(evt.Link, "https://gg.example.test/rsvp/tk_") {
			t.Errorf("link: got %s", evt.Link)
		}
	case <-time.After(10 * time.Second):
		t.Fatalf("did not see invitation.send within 10s (seen=%d)", seen.Load())
	}
}

// TestTokenIssueWithoutGuestEmailSkipsInvitation confirms that a guest
// with no email on file does NOT trigger a publish — the host still gets
// a copy-pasteable link.
func TestTokenIssueWithoutGuestEmailSkipsInvitation(t *testing.T) {
	if testing.Short() {
		t.Skip("skipping integration test in -short mode")
	}
	ctx, cancel := context.WithTimeout(context.Background(), 3*time.Minute)
	t.Cleanup(cancel)
	logger := slog.New(slog.NewTextHandler(io.Discard, nil))

	dsn := startPostgres(t, ctx)
	natsURL := startNATS(t, ctx)

	db, err := storage.NewDB(ctx, dsn)
	must(t, err, "connect db")
	t.Cleanup(db.Close)
	must(t, db.Migrate(ctx), "migrate")

	natsClient, err := natspub.Connect(ctx, natsURL, logger)
	must(t, err, "connect nats")
	t.Cleanup(natsClient.Close)

	var invitations atomic.Int32
	sub, err := natspub.NewInvitationSendSubscriber(ctx, natsClient, "test-no-email-invitation",
		func(ctx context.Context, evt natspub.InvitationSend) error {
			invitations.Add(1)
			return nil
		}, logger)
	must(t, err, "build subscriber")
	cc, err := sub.Start(ctx)
	must(t, err, "start subscriber")
	t.Cleanup(cc.Stop)

	apiSrv, err := api.NewServer(api.ServerDeps{
		Logger:               logger,
		DB:                   db,
		AccessPublisher:      natsClient,
		RSVPPublisher:        natsClient,
		InvitationPublisher:  natsClient,
		TokenTTL:             24 * time.Hour,
		JWTSecret:            testJWTSecret,
		JWTIssuer:            testJWTIssuer,
		AccessTokenTTL:       5 * time.Minute,
		RefreshTokenTTL:      24 * time.Hour,
		EmailVerificationTTL: 1 * time.Hour,
		PasswordResetTTL:     1 * time.Hour,
		PublicBaseURL:        "http://localhost",
	})
	must(t, err, "build api server")
	srv := httptest.NewServer(apiSrv.Handler())
	t.Cleanup(srv.Close)

	hostID := insertHost(t, ctx, db.Pool)
	hostToken := issueHostToken(t, hostID)

	eventID := createEvent(t, srv.URL, hostToken, "No Email Event", "no-email-event")
	// createGuest helper produces a guest with no email field set.
	guestID := createGuest(t, srv.URL, hostToken, eventID, "Phone-only Guest")

	var issued struct {
		InvitationQueued bool `json:"invitation_queued"`
	}
	postJSONAuthed(t,
		fmt.Sprintf("%s/events/%s/guests/%s/tokens", srv.URL, eventID, guestID),
		hostToken, nil, http.StatusCreated, &issued)
	if issued.InvitationQueued {
		t.Fatalf("expected invitation_queued=false for emailless guest")
	}

	// Give NATS a moment to surface any (unwanted) message.
	time.Sleep(500 * time.Millisecond)
	if invitations.Load() != 0 {
		t.Fatalf("expected 0 invitation.send messages, got %d", invitations.Load())
	}
}

// createGuestWithEmail is a thin wrapper that adds an email field, since
// the existing helper omits it.
func createGuestWithEmail(t *testing.T, base, accessToken string, eventID uuid.UUID, name string) (uuid.UUID, string) {
	t.Helper()
	email := fmt.Sprintf("guest-%d@example.test", time.Now().UnixNano())
	body := map[string]any{"name": name, "email": email}
	var out struct{ ID uuid.UUID `json:"id"` }
	postJSONAuthed(t, fmt.Sprintf("%s/events/%s/guests", base, eventID), accessToken,
		body, http.StatusCreated, &out)
	return out.ID, email
}

// Avoid the import being marked unused if a future refactor drops it.
var _ = json.Marshal