//go:build integration

package inttest

import (
	"context"
	"errors"
	"testing"

	"github.com/google/uuid"

	"scrabble/backend/internal/account"
)

// TestAccountProvisionByIdentity covers find-or-create semantics, distinct
// accounts per identity, GetByID, and the identity confirmed flag per kind.
func TestAccountProvisionByIdentity(t *testing.T) {
	ctx := context.Background()
	store := account.NewStore(testDB)

	tgExternal := "tg-" + uuid.NewString()
	first, err := store.ProvisionByIdentity(ctx, account.KindTelegram, tgExternal)
	if err != nil {
		t.Fatalf("provision telegram: %v", err)
	}
	if first.ID == uuid.Nil {
		t.Fatal("expected a non-nil account id")
	}
	if first.PreferredLanguage != "en" {
		t.Errorf("PreferredLanguage = %q, want default en", first.PreferredLanguage)
	}
	if first.TimeZone != "UTC" {
		t.Errorf("TimeZone = %q, want default UTC", first.TimeZone)
	}

	// Re-provisioning the same identity returns the same account.
	again, err := store.ProvisionByIdentity(ctx, account.KindTelegram, tgExternal)
	if err != nil {
		t.Fatalf("re-provision telegram: %v", err)
	}
	if again.ID != first.ID {
		t.Errorf("re-provision id = %s, want %s", again.ID, first.ID)
	}

	// A different identity yields a different account.
	other, err := store.ProvisionByIdentity(ctx, account.KindTelegram, "tg-"+uuid.NewString())
	if err != nil {
		t.Fatalf("provision other telegram: %v", err)
	}
	if other.ID == first.ID {
		t.Error("distinct identity must map to a distinct account")
	}

	// GetByID round-trips, and a random id reports ErrNotFound.
	got, err := store.GetByID(ctx, first.ID)
	if err != nil {
		t.Fatalf("get by id: %v", err)
	}
	if got.ID != first.ID {
		t.Errorf("get id = %s, want %s", got.ID, first.ID)
	}
	if _, err := store.GetByID(ctx, uuid.New()); !errors.Is(err, account.ErrNotFound) {
		t.Errorf("get missing = %v, want ErrNotFound", err)
	}

	// A platform identity is confirmed; an email identity starts unconfirmed.
	if c := identityConfirmed(t, account.KindTelegram, tgExternal); !c {
		t.Error("telegram identity must be confirmed")
	}
	emailExternal := "e-" + uuid.NewString() + "@example.com"
	if _, err := store.ProvisionByIdentity(ctx, account.KindEmail, emailExternal); err != nil {
		t.Fatalf("provision email: %v", err)
	}
	if c := identityConfirmed(t, account.KindEmail, emailExternal); c {
		t.Error("email identity must start unconfirmed")
	}
}

// TestGetStatsZeroForFreshAccount checks that an account with no finished games
// reads back the zero statistics rather than an error (the Stage 8 stats screen).
func TestGetStatsZeroForFreshAccount(t *testing.T) {
	ctx := context.Background()
	store := account.NewStore(testDB)
	id := provisionAccount(t)
	st, err := store.GetStats(ctx, id)
	if err != nil {
		t.Fatalf("get stats: %v", err)
	}
	if (st != account.Stats{}) {
		t.Fatalf("fresh stats = %+v, want zero", st)
	}
}

// identityConfirmed reads the confirmed flag for one identity directly.
func identityConfirmed(t *testing.T, kind, externalID string) bool {
	t.Helper()
	var confirmed bool
	err := testDB.QueryRowContext(context.Background(),
		"SELECT confirmed FROM identities WHERE kind = $1 AND external_id = $2",
		kind, externalID,
	).Scan(&confirmed)
	if err != nil {
		t.Fatalf("read confirmed for (%s, %s): %v", kind, externalID, err)
	}
	return confirmed
}

// TestProvisionTelegramSeedsNewAccountOnly checks that Telegram first contact
// seeds the new account's language and display name from the launch fields,
// defaults the in-app-only flag on, and never overwrites an existing account on a
// later login (Stage 9 language seeding).
func TestProvisionTelegramSeedsNewAccountOnly(t *testing.T) {
	ctx := context.Background()
	store := account.NewStore(testDB)
	ext := "tg-" + uuid.NewString()

	acc, err := store.ProvisionTelegram(ctx, ext, "ru-RU", "thehandle", "Иван")
	if err != nil {
		t.Fatalf("provision telegram: %v", err)
	}
	if acc.PreferredLanguage != "ru" {
		t.Errorf("PreferredLanguage = %q, want ru", acc.PreferredLanguage)
	}
	if acc.DisplayName != "Иван" {
		t.Errorf("DisplayName = %q, want Иван", acc.DisplayName)
	}
	if !acc.NotificationsInAppOnly {
		t.Error("NotificationsInAppOnly should default to true")
	}

	// A later login with different fields returns the same account, unchanged.
	again, err := store.ProvisionTelegram(ctx, ext, "en", "other", "Other")
	if err != nil {
		t.Fatalf("re-provision telegram: %v", err)
	}
	if again.ID != acc.ID {
		t.Errorf("re-provision id = %s, want %s", again.ID, acc.ID)
	}
	if again.PreferredLanguage != "ru" || again.DisplayName != "Иван" {
		t.Errorf("existing account overwritten: lang=%q name=%q", again.PreferredLanguage, again.DisplayName)
	}
}

// TestProvisionTelegramUnknownLanguageDefaults checks an unsupported Telegram
// client language falls back to the account default rather than failing the
// language CHECK.
func TestProvisionTelegramUnknownLanguageDefaults(t *testing.T) {
	ctx := context.Background()
	acc, err := account.NewStore(testDB).ProvisionTelegram(ctx, "tg-"+uuid.NewString(), "fr", "", "")
	if err != nil {
		t.Fatalf("provision telegram: %v", err)
	}
	if acc.PreferredLanguage != "en" {
		t.Errorf("PreferredLanguage = %q, want default en", acc.PreferredLanguage)
	}
}

// TestIdentityExternalID covers the reverse identity lookup the push-target route
// uses: it returns the external_id for the matching kind and ErrNotFound otherwise,
// including for a guest that carries no identity.
func TestIdentityExternalID(t *testing.T) {
	ctx := context.Background()
	store := account.NewStore(testDB)
	ext := "tg-" + uuid.NewString()
	acc, err := store.ProvisionTelegram(ctx, ext, "en", "", "Tg User")
	if err != nil {
		t.Fatalf("provision telegram: %v", err)
	}
	got, err := store.IdentityExternalID(ctx, acc.ID, account.KindTelegram)
	if err != nil {
		t.Fatalf("identity external id: %v", err)
	}
	if got != ext {
		t.Errorf("external id = %q, want %q", got, ext)
	}
	if _, err := store.IdentityExternalID(ctx, acc.ID, account.KindEmail); !errors.Is(err, account.ErrNotFound) {
		t.Errorf("email lookup = %v, want ErrNotFound", err)
	}
	guest := provisionGuest(t)
	if _, err := store.IdentityExternalID(ctx, guest, account.KindTelegram); !errors.Is(err, account.ErrNotFound) {
		t.Errorf("guest lookup = %v, want ErrNotFound", err)
	}
}

// TestNotificationsInAppOnlyRoundTrip checks the Stage 9 profile flag persists
// through UpdateProfile and reads back through GetByID.
func TestNotificationsInAppOnlyRoundTrip(t *testing.T) {
	ctx := context.Background()
	store := account.NewStore(testDB)
	acc, err := store.ProvisionTelegram(ctx, "tg-"+uuid.NewString(), "en", "", "Player")
	if err != nil {
		t.Fatalf("provision telegram: %v", err)
	}
	if !acc.NotificationsInAppOnly {
		t.Fatal("default should be in-app-only true")
	}
	updated, err := store.UpdateProfile(ctx, acc.ID, account.ProfileUpdate{
		DisplayName:            "Player",
		PreferredLanguage:      "en",
		TimeZone:               "UTC",
		NotificationsInAppOnly: false,
	})
	if err != nil {
		t.Fatalf("update profile: %v", err)
	}
	if updated.NotificationsInAppOnly {
		t.Error("update did not clear NotificationsInAppOnly")
	}
	got, err := store.GetByID(ctx, acc.ID)
	if err != nil {
		t.Fatalf("get by id: %v", err)
	}
	if got.NotificationsInAppOnly {
		t.Error("GetByID still reports in-app-only after clearing")
	}
}