//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"
)

// 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 TestMatchmakingPairsAndStartsGame(t *testing.T) {
	ctx := context.Background()
	mm := newMatchmaker(t, newRobotService(t, newGameService()), 10*time.Second)
	a, b := provisionAccount(t), provisionAccount(t)

	r1, err := mm.Enqueue(ctx, a, engine.VariantEnglish)
	if err != nil {
		t.Fatalf("enqueue a: %v", err)
	}
	if r1.Matched {
		t.Fatal("first enqueue must wait")
	}
	r2, err := mm.Enqueue(ctx, b, engine.VariantEnglish)
	if err != nil {
		t.Fatalf("enqueue b: %v", err)
	}
	if !r2.Matched {
		t.Fatal("second enqueue must match")
	}
	seats, _, status, err := newGameService().Participants(ctx, r2.Game.ID)
	if err != nil {
		t.Fatalf("participants: %v", err)
	}
	if status != "active" || len(seats) != 2 {
		t.Fatalf("matched game state: status %q seats %v", status, seats)
	}
}

func TestInvitationAllAcceptStartsGame(t *testing.T) {
	ctx := context.Background()
	svc := newInvitationService()
	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)
	}
	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()
	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 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()
	social := newSocialService()
	inviter := provisionAccount(t)
	invitee := provisionAccount(t)
	if err := social.Block(ctx, invitee, inviter); err != nil {
		t.Fatalf("block: %v", err)
	}
	if _, err := svc.CreateInvitation(ctx, inviter, []uuid.UUID{invitee}, englishInvite()); !errors.Is(err, lobby.ErrInvitationBlocked) {
		t.Fatalf("create blocked = %v, want ErrInvitationBlocked", err)
	}
}

func TestInvitationCancelByInviter(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)
	}
	// 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)
	}
	if _, err := svc.RespondInvitation(ctx, inv.ID, invitees[0], true); !errors.Is(err, lobby.ErrInvitationNotPending) {
		t.Fatalf("respond after cancel = %v, want ErrInvitationNotPending", err)
	}
}