//go:build integration

package inttest

import (
	"context"
	"errors"
	"testing"
	"time"

	"github.com/google/uuid"

	"scrabble/backend/internal/account"
	"scrabble/backend/internal/engine"
	"scrabble/backend/internal/lobby"
	"scrabble/backend/internal/notify"
)

// newInvitationService builds an invitation service over the shared pool, starting
// games through a real game service and reading blocks through a social service.
func newInvitationService() *lobby.InvitationService {
	return lobby.NewInvitationService(lobby.NewStore(testDB), newGameService(), account.NewStore(testDB), newSocialService())
}

func englishInvite() lobby.InvitationSettings {
	return lobby.InvitationSettings{
		Variant:        engine.VariantEnglish,
		TurnTimeout:    24 * time.Hour,
		HintsAllowed:   true,
		HintsPerPlayer: 1,
	}
}

func TestMatchmakingOpensThenJoins(t *testing.T) {
	ctx := context.Background()
	clearOpenGames(t)
	mm := newMatchmaker(t, newRobotService(t, newGameService()), 90*time.Second, 90*time.Second)
	a, b := provisionAccount(t), provisionAccount(t)

	// The first player opens a game and enters it immediately, still awaiting an opponent.
	r1, err := mm.Enqueue(ctx, a, engine.VariantEnglish, true)
	if err != nil {
		t.Fatalf("enqueue a: %v", err)
	}
	if r1.Matched {
		t.Fatal("first enqueue must open a game awaiting an opponent, not match")
	}
	if _, _, status, err := newGameService().Participants(ctx, r1.Game.ID); err != nil || status != "open" {
		t.Fatalf("opened game status = %q err %v, want open", status, err)
	}

	// A second player for the same variant and rule joins that open game, which starts.
	r2, err := mm.Enqueue(ctx, b, engine.VariantEnglish, true)
	if err != nil {
		t.Fatalf("enqueue b: %v", err)
	}
	if !r2.Matched || r2.Game.ID != r1.Game.ID {
		t.Fatalf("second enqueue = (matched %v, game %s), want it to join the open game %s", r2.Matched, r2.Game.ID, r1.Game.ID)
	}
	seats, _, status, err := newGameService().Participants(ctx, r2.Game.ID)
	if err != nil {
		t.Fatalf("participants: %v", err)
	}
	has := func(id uuid.UUID) bool {
		for _, s := range seats {
			if s == id {
				return true
			}
		}
		return false
	}
	if status != "active" || len(seats) != 2 || !has(a) || !has(b) {
		t.Fatalf("joined game: status %q seats %v (want active with a=%s and b=%s)", status, seats, a, b)
	}
}

// TestMatchmakingReEnqueueOpensNewGame checks a re-enqueue opens a fresh open game
// rather than returning the caller's existing one: tapping "random opponent" again while
// still waiting starts a new search instead of bouncing the player back into the pending
// game. Both games stay open until an opponent (a human or the reaper's robot) joins each.
func TestMatchmakingReEnqueueOpensNewGame(t *testing.T) {
	ctx := context.Background()
	clearOpenGames(t)
	mm := newMatchmaker(t, newRobotService(t, newGameService()), 90*time.Second, 90*time.Second)
	a := provisionAccount(t)

	r1, err := mm.Enqueue(ctx, a, engine.VariantEnglish, true)
	if err != nil {
		t.Fatalf("enqueue: %v", err)
	}
	r2, err := mm.Enqueue(ctx, a, engine.VariantEnglish, true)
	if err != nil {
		t.Fatalf("re-enqueue: %v", err)
	}
	if r2.Matched || r2.Game.ID == r1.Game.ID {
		t.Fatalf("re-enqueue = (game %s, matched %v), want a new open game distinct from %s, unmatched", r2.Game.ID, r2.Matched, r1.Game.ID)
	}
	for _, g := range []uuid.UUID{r1.Game.ID, r2.Game.ID} {
		if _, _, status, err := newGameService().Participants(ctx, g); err != nil || status != "open" {
			t.Fatalf("game %s status = %q err %v, want open", g, status, err)
		}
	}
}

func TestInvitationAllAcceptStartsGame(t *testing.T) {
	ctx := context.Background()
	svc := newInvitationService()
	pub := &capturePublisher{}
	svc.SetNotifier(pub)
	inviter := provisionAccount(t)
	invitees := []uuid.UUID{provisionAccount(t), provisionAccount(t)}

	inv, err := svc.CreateInvitation(ctx, inviter, invitees, englishInvite())
	if err != nil {
		t.Fatalf("create: %v", err)
	}
	if inv.Status != "pending" || len(inv.Invitees) != 2 {
		t.Fatalf("unexpected invitation: %+v", inv)
	}

	if got, err := svc.RespondInvitation(ctx, inv.ID, invitees[0], true); err != nil || got.Status != "pending" {
		t.Fatalf("first accept: status %q err %v", got.Status, err)
	}
	final, err := svc.RespondInvitation(ctx, inv.ID, invitees[1], true)
	if err != nil {
		t.Fatalf("second accept: %v", err)
	}
	if final.Status != "started" || final.GameID == nil {
		t.Fatalf("invitation not started: %+v", final)
	}
	// Every participant is told the invitation changed so their lobby drops the (now started) card
	// from any screen, and the started-game notification lands too.
	for _, u := range append([]uuid.UUID{inviter}, invitees...) {
		if !pub.notified(u, notify.NotifyInvitationUpdate) {
			t.Errorf("participant %s missing invitation_update", u)
		}
	}
	if !pub.notified(invitees[0], notify.NotifyGameStarted) {
		t.Errorf("invitee missing game_started")
	}
	seats, _, status, err := newGameService().Participants(ctx, *final.GameID)
	if err != nil {
		t.Fatalf("participants: %v", err)
	}
	if status != "active" || len(seats) != 3 || seats[0] != inviter {
		t.Fatalf("started game: status %q seats %v (inviter %s)", status, seats, inviter)
	}
}

func TestInvitationDeclineCancels(t *testing.T) {
	ctx := context.Background()
	svc := newInvitationService()
	pub := &capturePublisher{}
	svc.SetNotifier(pub)
	inviter := provisionAccount(t)
	invitees := []uuid.UUID{provisionAccount(t), provisionAccount(t)}
	inv, err := svc.CreateInvitation(ctx, inviter, invitees, englishInvite())
	if err != nil {
		t.Fatalf("create: %v", err)
	}
	got, err := svc.RespondInvitation(ctx, inv.ID, invitees[0], false)
	if err != nil {
		t.Fatalf("decline: %v", err)
	}
	if got.Status != "declined" || got.GameID != nil {
		t.Fatalf("after decline: %+v", got)
	}
	// A decline kills the whole invitation: every participant is notified to drop it.
	for _, u := range append([]uuid.UUID{inviter}, invitees...) {
		if !pub.notified(u, notify.NotifyInvitationUpdate) {
			t.Errorf("participant %s missing invitation_update after decline", u)
		}
	}
	// A further response is refused.
	if _, err := svc.RespondInvitation(ctx, inv.ID, invitees[1], true); !errors.Is(err, lobby.ErrInvitationNotPending) {
		t.Fatalf("respond after decline = %v, want ErrInvitationNotPending", err)
	}
}

func TestInvitationLazyExpiry(t *testing.T) {
	ctx := context.Background()
	svc := newInvitationService()
	inviter := provisionAccount(t)
	invitees := []uuid.UUID{provisionAccount(t)}
	inv, err := svc.CreateInvitation(ctx, inviter, invitees, englishInvite())
	if err != nil {
		t.Fatalf("create: %v", err)
	}
	if _, err := testDB.ExecContext(ctx,
		`UPDATE backend.game_invitations SET expires_at = now() - interval '1 minute' WHERE invitation_id = $1`, inv.ID); err != nil {
		t.Fatalf("backdate expiry: %v", err)
	}
	if _, err := svc.RespondInvitation(ctx, inv.ID, invitees[0], true); !errors.Is(err, lobby.ErrInvitationExpired) {
		t.Fatalf("respond expired = %v, want ErrInvitationExpired", err)
	}
}

func TestInvitationBlockedInvitee(t *testing.T) {
	ctx := context.Background()
	svc := newInvitationService()
	pub := &capturePublisher{}
	svc.SetNotifier(pub)
	soc := newSocialService()

	// The inviter has blocked an invitee: the invitation is refused outright (the inviter is aware).
	inviter := provisionAccount(t)
	blockedInvitee := provisionAccount(t)
	if err := soc.Block(ctx, inviter, blockedInvitee); err != nil {
		t.Fatalf("block: %v", err)
	}
	if _, err := svc.CreateInvitation(ctx, inviter, []uuid.UUID{blockedInvitee}, englishInvite()); !errors.Is(err, lobby.ErrInvitationBlocked) {
		t.Fatalf("create with a blocked invitee = %v, want ErrInvitationBlocked", err)
	}

	// An invitee who has blocked the inviter is instead suppressed: the invitation is created
	// (no error — the inviter notices nothing), but that invitee is never notified and never
	// sees it in their list.
	inviter2 := provisionAccount(t)
	suppressed := provisionAccount(t)
	if err := soc.Block(ctx, suppressed, inviter2); err != nil {
		t.Fatalf("block: %v", err)
	}
	if _, err := svc.CreateInvitation(ctx, inviter2, []uuid.UUID{suppressed}, englishInvite()); err != nil {
		t.Fatalf("create with a suppressing invitee = %v, want nil", err)
	}
	if pub.notified(suppressed, notify.NotifyInvitation) {
		t.Error("an invitee who blocked the inviter must not be notified of the invitation")
	}
	if list, _ := svc.ListInvitations(ctx, suppressed); len(list) != 0 {
		t.Errorf("suppressed invitee's invitation list = %v, want empty", list)
	}
}

func TestInvitationCancelByInviter(t *testing.T) {
	ctx := context.Background()
	svc := newInvitationService()
	pub := &capturePublisher{}
	svc.SetNotifier(pub)
	inviter := provisionAccount(t)
	invitees := []uuid.UUID{provisionAccount(t)}
	inv, err := svc.CreateInvitation(ctx, inviter, invitees, englishInvite())
	if err != nil {
		t.Fatalf("create: %v", err)
	}
	// A non-inviter cannot cancel.
	if err := svc.CancelInvitation(ctx, inv.ID, invitees[0]); !errors.Is(err, lobby.ErrNotInviter) {
		t.Fatalf("stranger cancel = %v, want ErrNotInviter", err)
	}
	if err := svc.CancelInvitation(ctx, inv.ID, inviter); err != nil {
		t.Fatalf("inviter cancel: %v", err)
	}
	// The cancellation reaches every participant so an invitee's lobby drops the card from any screen.
	for _, u := range append([]uuid.UUID{inviter}, invitees...) {
		if !pub.notified(u, notify.NotifyInvitationUpdate) {
			t.Errorf("participant %s missing invitation_update after cancel", u)
		}
	}
	if _, err := svc.RespondInvitation(ctx, inv.ID, invitees[0], true); !errors.Is(err, lobby.ErrInvitationNotPending) {
		t.Fatalf("respond after cancel = %v, want ErrInvitationNotPending", err)
	}
}

func TestListInvitations(t *testing.T) {
	ctx := context.Background()
	svc := newInvitationService()
	inviter := provisionAccount(t)
	invitee := provisionAccount(t)
	inv, err := svc.CreateInvitation(ctx, inviter, []uuid.UUID{invitee}, englishInvite())
	if err != nil {
		t.Fatalf("create: %v", err)
	}
	// An open invitation appears for both the inviter and the invitee.
	for _, who := range []uuid.UUID{inviter, invitee} {
		list, err := svc.ListInvitations(ctx, who)
		if err != nil {
			t.Fatalf("list for %s: %v", who, err)
		}
		if len(list) != 1 || list[0].ID != inv.ID {
			t.Fatalf("invitations for %s = %+v, want [%s]", who, list, inv.ID)
		}
	}
	// Once accepted (the game starts), it is no longer an open invitation.
	if _, err := svc.RespondInvitation(ctx, inv.ID, invitee, true); err != nil {
		t.Fatalf("accept: %v", err)
	}
	if list, _ := svc.ListInvitations(ctx, inviter); len(list) != 0 {
		t.Fatalf("started invitation still listed: %+v", list)
	}
}