//go:build integration

package inttest

import (
	"context"
	"database/sql"
	"testing"
	"time"

	"github.com/google/uuid"

	"scrabble/backend/internal/account"
	"scrabble/backend/internal/accountdelete"
	"scrabble/backend/internal/engine"
	"scrabble/backend/internal/game"
)

// deletedFields reads a tombstoned account's retained real name and its deleted_at.
func deletedFields(t *testing.T, accountID uuid.UUID) (name string, deletedAt sql.NullTime) {
	t.Helper()
	var dn sql.NullString
	err := testDB.QueryRowContext(context.Background(),
		"SELECT deleted_display_name, deleted_at FROM accounts WHERE account_id = $1", accountID).
		Scan(&dn, &deletedAt)
	if err != nil {
		t.Fatalf("read deleted fields %s: %v", accountID, err)
	}
	return dn.String, deletedAt
}

// TestAnonymizeAndTombstone: deletion journals + frees the credentials, tombstones the
// account, scrubs the live name while retaining the real one, and frees the creds for a
// new account to reuse.
func TestAnonymizeAndTombstone(t *testing.T) {
	ctx := context.Background()
	store := account.NewStore(testDB)
	deleter := accountdelete.NewDeleter(testDB)

	acc, _, err := store.ProvisionTelegram(ctx, "tg-"+uuid.NewString(), "ru", "handle", "Иван", "+03:00")
	if err != nil {
		t.Fatalf("provision: %v", err)
	}
	email := "del-" + uuid.NewString() + "@example.com"
	if err := store.AttachIdentity(ctx, acc.ID, account.KindEmail, email, true); err != nil {
		t.Fatalf("attach email: %v", err)
	}
	before, err := store.GetByID(ctx, acc.ID)
	if err != nil {
		t.Fatalf("load before: %v", err)
	}

	if err := deleter.AnonymizeAndTombstone(ctx, acc.ID); err != nil {
		t.Fatalf("delete: %v", err)
	}

	// The live identities are gone.
	if ids, err := store.Identities(ctx, acc.ID); err != nil || len(ids) != 0 {
		t.Fatalf("identities after delete = %+v (err %v), want none", ids, err)
	}
	// Both credentials are journalled with reason=delete.
	got := retainedRows(t, acc.ID)
	if len(got) != 2 {
		t.Fatalf("retained rows = %+v, want 2", got)
	}
	for _, r := range got {
		if r.reason != "delete" {
			t.Errorf("retained reason = %q, want delete", r.reason)
		}
	}
	// The live name is scrubbed; the real one is retained; deleted_at is set.
	after, err := store.GetByID(ctx, acc.ID)
	if err != nil {
		t.Fatalf("load after: %v", err)
	}
	if after.DisplayName != accountdelete.AnonymizedName {
		t.Errorf("live display name = %q, want %q", after.DisplayName, accountdelete.AnonymizedName)
	}
	name, deletedAt := deletedFields(t, acc.ID)
	if name != before.DisplayName {
		t.Errorf("retained name = %q, want %q", name, before.DisplayName)
	}
	if !deletedAt.Valid || time.Since(deletedAt.Time) > time.Minute {
		t.Errorf("deleted_at = %+v, want a recent timestamp", deletedAt)
	}
	// The credentials are free: a new account can claim the same email.
	other, _, err := store.ProvisionTelegram(ctx, "tg-"+uuid.NewString(), "en", "", "Other", "")
	if err != nil {
		t.Fatalf("provision other: %v", err)
	}
	if err := store.AttachIdentity(ctx, other.ID, account.KindEmail, email, true); err != nil {
		t.Fatalf("email should be free after deletion, got: %v", err)
	}
}

// TestDropAllRobotGames drops the deletee's solo vs-AI game but keeps a game with a human
// opponent.
func TestDropAllRobotGames(t *testing.T) {
	ctx := context.Background()
	gsvc := newGameService()
	robots := newRobotService(t, gsvc)
	if err := robots.EnsurePool(ctx); err != nil {
		t.Fatalf("ensure pool: %v", err)
	}
	mm := newMatchmaker(t, robots, time.Minute, 0)
	deleter := accountdelete.NewDeleter(testDB)

	user := provisionAccount(t)
	other := provisionAccount(t)

	aiRes, err := mm.StartVsAI(ctx, user, engine.VariantEnglish, true)
	if err != nil {
		t.Fatalf("start vs AI: %v", err)
	}
	humanGame, err := gsvc.Create(ctx, game.CreateParams{
		Variant: engine.VariantEnglish, Seats: []uuid.UUID{user, other}, TurnTimeout: time.Hour, Seed: 1,
	})
	if err != nil {
		t.Fatalf("create human game: %v", err)
	}

	n, err := deleter.DropAllRobotGames(ctx, user)
	if err != nil {
		t.Fatalf("drop: %v", err)
	}
	if n != 1 {
		t.Fatalf("dropped %d games, want 1 (the vs-AI game)", n)
	}
	if _, err := gsvc.GameByID(ctx, aiRes.Game.ID); err == nil {
		t.Error("the vs-AI game should be dropped")
	}
	if _, err := gsvc.GameByID(ctx, humanGame.ID); err != nil {
		t.Errorf("the human game should be kept, got: %v", err)
	}
}