//go:build test && dev

package payments

// Tests pinning the SCA-only behavior on the till and gift-card saved-card
// charge gates (till.go / giftcards.go) after the 2FA fallback removal: the
// gate NEVER verifies or consumes a 2FA code anymore — a token-less saved-card
// charge is refused 402 verification_required up front (PSR 2017 reg 100), so
// the customer's pending code is left untouched (not consumed at the gate, no
// re-issue on failure). The consume-at-gate / re-issue semantics that these
// tests used to pin are GONE: the homegrown 2FA fallback was removed entirely.
//
// These tests flip REQUIRE_2FA/SQUARE_ENVIRONMENT via t.Setenv and therefore
// must stay sequential (no t.Parallel) — see the note at the top of
// twofa_test.go. They use SQUARE_ENVIRONMENT=staging (NOT production) for
// enforcement: twoFactorEnforced() is fail-closed, so any non-mock/dev value
// enforces the gate, while square.NewDevClient() — which the injected fault
// client constructs at call time — returns the in-memory mock for every env
// except production/sandbox. The shared helperEnvEnforce2FA sets production,
// which would panic NewDevClient in a dev build.

import (
	"context"
	"database/sql"
	"encoding/json"
	"net/http"
	"testing"

	"crussell/internal/square"
	"crussell/internal/twofa"
	"crussell/testutils"
	"crussell/testutils/fixtures"
	"crussell/testutils/jwt"

	"github.com/stretchr/testify/require"
)

// TestTwoFactorEnforced_CreateTillSale_SavedCard_Tokenless_RefusedWithoutConsuming
// pins the till saved-card gate: a token-less charge is refused 402
// verification_required BEFORE the 2FA code is consulted, so the customer's
// pending code is never consumed and no re-issue runs (the fallback was
// removed — the gate has no code path at all).
func TestTwoFactorEnforced_CreateTillSale_SavedCard_Tokenless_RefusedWithoutConsuming(t *testing.T) {
	t.Setenv("REQUIRE_2FA", "true")
	t.Setenv("SQUARE_ENVIRONMENT", "staging")
	ctx, tx := testutils.SetupTestTx(t)

	adminID, err := fixtures.CreateTestAdminUser(tx)
	require.NoError(t, err)
	userID, err := fixtures.CreateTestUser(tx)
	require.NoError(t, err)
	adminToken := jwt.GenerateTestToken(adminID, "admin")
	seedTwoFAPendingCode(t, tx, userID, "556677")

	cardID, err := fixtures.CreateTestPaymentMethod(tx, userID, "ccof:sq_test_card_id", "VISA", "1234")
	require.NoError(t, err)

	origClient := SquareClient
	SquareClient = &definitiveChargeClient{SquareClient: square.NewDevClient(), createErr: structuredSquareErrorWithCode(t, http.StatusPaymentRequired, "CARD_DECLINED")}
	defer func() { SquareClient = origClient }()

	req := TillSaleRequest{
		ItemType:         "gift_card",
		Action:           "create",
		Amount:           50.00,
		PaymentMethod:    "saved_card",
		UserSavedCardID:  &cardID,
		UserID:           &userID,
		IdempotencyKey:   "2fa-till-fresh-decline",
	}

	w := makePaymentRequest(CreateTillSale, "POST", "/api/admin/till/sale", req, adminToken, ctx)
	require.Equal(t, http.StatusPaymentRequired, w.Code, "a token-less till saved-card charge must be refused 402 verification_required (SCA-only), body: %s", w.Body.String())
	var body map[string]string
	require.NoError(t, json.Unmarshal(w.Body.Bytes(), &body))
	require.Equal(t, "verification_required", body["code"])

	// The gate never verified the code — the seeded hash must survive untouched
	// (no consumption, no re-issue).
	var hash sql.NullString
	require.NoError(t, tx.QueryRow(ctx, "SELECT two_factor_pending_code_hash FROM users WHERE id = $1", userID).Scan(&hash))
	require.True(t, hash.Valid, "the pending 2FA code must survive a refused token-less charge")
	require.Equal(t, twofa.Hash("556677"), hash.String, "the gate must not consume the code — it was never consulted")
}

// TestTwoFactorEnforced_CreateTillSale_SavedCard_PendingReuse_Tokenless_Refused
// pins the same SCA-only refusal on a PENDING-REUSE till retry: the gate still
// refuses 402 verification_required (the code is irrelevant), leaving the
// seeded code untouched.
func TestTwoFactorEnforced_CreateTillSale_SavedCard_PendingReuse_Tokenless_Refused(t *testing.T) {
	t.Setenv("REQUIRE_2FA", "true")
	t.Setenv("SQUARE_ENVIRONMENT", "staging")
	ctx, tx := testutils.SetupTestTx(t)

	adminID, err := fixtures.CreateTestAdminUser(tx)
	require.NoError(t, err)
	userID, err := fixtures.CreateTestUser(tx)
	require.NoError(t, err)
	adminToken := jwt.GenerateTestToken(adminID, "admin")
	seedTwoFAPendingCode(t, tx, userID, "667788")

	cardID, err := fixtures.CreateTestPaymentMethod(tx, userID, "ccof:sq_test_card_id", "VISA", "1234")
	require.NoError(t, err)

	// Seed a PENDING till_sale with the same key — a prior attempt whose
	// Square charge failed after the DB transaction committed (card funded).
	key := "2fa-till-pending-reuse"
	var giftCardID string
	require.NoError(t, tx.QueryRow(ctx, `
		INSERT INTO gift_cards (total_funds_added, amount_remaining, created_by, is_inventory, voucher_type_at_purchase)
		VALUES (50.00, 50.00, $1, FALSE, 'SPV') RETURNING id
	`, adminID).Scan(&giftCardID))
	_, err = tx.Exec(ctx, `
		INSERT INTO till_sales (item_type, item_id, description, quantity, unit_price, total_amount,
			payment_method, status, user_id, user_saved_card_id, idempotency_key, created_by, created_at, updated_at)
		VALUES ('gift_card', $1, 'Gift Card create', 1, 50.00, 50.00, 'online_square', 'pending',
			$2, $3, $4, $5, NOW(), NOW())
	`, giftCardID, userID, cardID, key, adminID)
	require.NoError(t, err)

	origClient := SquareClient
	SquareClient = &definitiveChargeClient{SquareClient: square.NewDevClient(), createErr: structuredSquareErrorWithCode(t, http.StatusPaymentRequired, "CARD_DECLINED")}
	defer func() { SquareClient = origClient }()

	req := TillSaleRequest{
		ItemType:         "gift_card",
		Action:           "create",
		Amount:           50.00,
		PaymentMethod:    "saved_card",
		UserSavedCardID:  &cardID,
		UserID:           &userID,
		IdempotencyKey:   key,
	}

	w := makePaymentRequest(CreateTillSale, "POST", "/api/admin/till/sale", req, adminToken, ctx)
	require.Equal(t, http.StatusPaymentRequired, w.Code, "a token-less till saved-card charge must be refused 402 verification_required (SCA-only), body: %s", w.Body.String())

	var hash sql.NullString
	require.NoError(t, tx.QueryRow(ctx, "SELECT two_factor_pending_code_hash FROM users WHERE id = $1", userID).Scan(&hash))
	require.True(t, hash.Valid, "the pending 2FA code must survive a refused token-less charge")
	require.Equal(t, twofa.Hash("667788"), hash.String, "the gate must not consume the code — it was never consulted")
}

// TestTwoFactorEnforced_BuyGiftCard_SavedCard_Tokenless_RefusedWithoutConsuming
// pins the SCA-only refusal on the gift-card purchase saved-card gate: a
// token-less charge is refused 402 verification_required and the seeded code is
// untouched (no consumption, no re-issue).
func TestTwoFactorEnforced_BuyGiftCard_SavedCard_Tokenless_RefusedWithoutConsuming(t *testing.T) {
	t.Setenv("REQUIRE_2FA", "true")
	t.Setenv("SQUARE_ENVIRONMENT", "staging")
	ctx, tx := testutils.SetupTestTx(t)

	userID, err := fixtures.CreateTestUser(tx)
	require.NoError(t, err)
	token := jwt.GenerateTestToken(userID, "verified_email")
	seedTwoFAPendingCode(t, tx, userID, "112233")

	cardID, err := fixtures.CreateTestPaymentMethod(tx, userID, "ccof:sq_test_card_id", "VISA", "1234")
	require.NoError(t, err)

	origClient := SquareClient
	SquareClient = &definitiveChargeClient{SquareClient: square.NewDevClient(), createErr: structuredSquareErrorWithCode(t, http.StatusPaymentRequired, "CARD_DECLINED")}
	defer func() { SquareClient = origClient }()

	req := BuyGiftCardRequest{
		Amount:           2000,
		RecipientType:    "self",
		CardID:           &cardID,
		IdempotencyKey:   "2fa-buy-gc-fresh-decline",
	}

	w := makePaymentRequest(BuyGiftCard, "POST", "/api/user/giftcards/buy", req, token, ctx)
	require.Equal(t, http.StatusPaymentRequired, w.Code, "a token-less gift-card saved-card charge must be refused 402 verification_required (SCA-only), body: %s", w.Body.String())
	var body map[string]string
	require.NoError(t, json.Unmarshal(w.Body.Bytes(), &body))
	require.Equal(t, "verification_required", body["code"])

	var hash sql.NullString
	require.NoError(t, tx.QueryRow(ctx, "SELECT two_factor_pending_code_hash FROM users WHERE id = $1", userID).Scan(&hash))
	require.True(t, hash.Valid, "the pending 2FA code must survive a refused token-less charge")
	require.Equal(t, twofa.Hash("112233"), hash.String, "the gate must not consume the code — it was never consulted")
}

// TestTwoFactorEnforced_BuyGiftCard_SavedCard_PendingReuse_Tokenless_Refused
// pins the SCA-only refusal on a PENDING-REUSE gift-card purchase retry: the
// gate refuses 402 verification_required regardless of the pending state,
// leaving the seeded code untouched.
func TestTwoFactorEnforced_BuyGiftCard_SavedCard_PendingReuse_Tokenless_Refused(t *testing.T) {
	t.Setenv("REQUIRE_2FA", "true")
	t.Setenv("SQUARE_ENVIRONMENT", "staging")
	ctx, tx := testutils.SetupTestTx(t)

	userID, err := fixtures.CreateTestUser(tx)
	require.NoError(t, err)
	token := jwt.GenerateTestToken(userID, "verified_email")
	seedTwoFAPendingCode(t, tx, userID, "334455")

	cardID, err := fixtures.CreateTestPaymentMethod(tx, userID, "ccof:sq_test_card_id", "VISA", "1234")
	require.NoError(t, err)

	// Seed a PENDING payment record with the same key — a prior attempt whose
	// Square charge failed (mirrors TestBuyGiftCard_RetryPending_ReattemptsCharge).
	key := "2fa-buy-gc-pending-reuse"
	_, err = tx.Exec(context.Background(), `
		INSERT INTO payments (payment_type, payment_method, status, amount, idempotency_key, created_at, updated_at, created_by)
		VALUES ('full', 'online_square', 'pending', 20.00, $1, NOW(), NOW(), $2)
	`, key, userID)
	require.NoError(t, err)

	origClient := SquareClient
	SquareClient = &definitiveChargeClient{SquareClient: square.NewDevClient(), createErr: structuredSquareErrorWithCode(t, http.StatusPaymentRequired, "CARD_DECLINED")}
	defer func() { SquareClient = origClient }()

	req := BuyGiftCardRequest{
		Amount:           2000,
		RecipientType:    "self",
		CardID:           &cardID,
		IdempotencyKey:   key,
	}

	w := makePaymentRequest(BuyGiftCard, "POST", "/api/user/giftcards/buy", req, token, ctx)
	require.Equal(t, http.StatusPaymentRequired, w.Code, "a token-less gift-card saved-card charge must be refused 402 verification_required (SCA-only), body: %s", w.Body.String())

	var hash sql.NullString
	require.NoError(t, tx.QueryRow(ctx, "SELECT two_factor_pending_code_hash FROM users WHERE id = $1", userID).Scan(&hash))
	require.True(t, hash.Valid, "the pending 2FA code must survive a refused token-less charge")
	require.Equal(t, twofa.Hash("334455"), hash.String, "the gate must not consume the code — it was never consulted")
}

// TestTwoFactorEnforced_CreateBookingPayment_NewCardSaveCard_Tokenless_Refused
// pins the SCA-only refusal on the booking NEW-card + save_card SAVE gate: a
// token-less save is refused 402 verification_required and the seeded code is
// untouched (no consumption at the save gate, no re-issue — the fallback is
// gone).
func TestTwoFactorEnforced_CreateBookingPayment_NewCardSaveCard_Tokenless_Refused(t *testing.T) {
	t.Setenv("REQUIRE_2FA", "true")
	t.Setenv("SQUARE_ENVIRONMENT", "staging")
	ctx, tx := testutils.SetupTestTx(t)

	userID, bookingID, _ := setupTestData(t, ctx, tx)
	userToken := jwt.GenerateUserToken(userID)
	seedTwoFAPendingCode(t, tx, userID, "999001")

	origClient := SquareClient
	SquareClient = &definitiveChargeClient{SquareClient: square.NewDevClient(), createErr: structuredSquareErrorWithCode(t, http.StatusPaymentRequired, "CARD_DECLINED")}
	defer func() { SquareClient = origClient }()

	cardToken := "cnon:2fa-booking-newcard-savecard-decline"
	req := CreateBookingPaymentRequest{
		Amount:           2500,
		PaymentType:      "deposit",
		NewCardToken:     &cardToken,
		SaveCard:         true,
		IdempotencyKey:   "2fa-booking-newcard-savecard-decline",
	}

	w := makePaymentRequest(withNonGuest(CreateBookingPayment), "POST", "/api/bookings/"+bookingID+"/payment", req, userToken, ctx)
	require.Equal(t, http.StatusPaymentRequired, w.Code, "a token-less new-card + save_card booking charge must be refused 402 verification_required (SCA-only), body: %s", w.Body.String())
	var body map[string]string
	require.NoError(t, json.Unmarshal(w.Body.Bytes(), &body))
	require.Equal(t, "verification_required", body["code"])

	var hash sql.NullString
	require.NoError(t, tx.QueryRow(ctx, "SELECT two_factor_pending_code_hash FROM users WHERE id = $1", userID).Scan(&hash))
	require.True(t, hash.Valid, "the pending 2FA code must survive a refused token-less charge")
	require.Equal(t, twofa.Hash("999001"), hash.String, "the save gate must not consume the code — it was never consulted")
}

// TestTwoFactorEnforced_CreateTipPayment_NewCardSaveCard_Tokenless_Refused pins
// the same SCA-only refusal on the TIP new-card + save_card SAVE gate.
func TestTwoFactorEnforced_CreateTipPayment_NewCardSaveCard_Tokenless_Refused(t *testing.T) {
	t.Setenv("REQUIRE_2FA", "true")
	t.Setenv("SQUARE_ENVIRONMENT", "staging")
	ctx, tx := testutils.SetupTestTx(t)

	userID, bookingID, _ := setupTestDataPast(t, ctx, tx)
	userToken := jwt.GenerateUserToken(userID)
	seedTwoFAPendingCode(t, tx, userID, "999002")
	_, err := fixtures.CreateTestPayment(tx, bookingID, 5000.00, "online_square", "full", "completed")
	require.NoError(t, err)

	origClient := SquareClient
	SquareClient = &definitiveChargeClient{SquareClient: square.NewDevClient(), createErr: structuredSquareErrorWithCode(t, http.StatusPaymentRequired, "CARD_DECLINED")}
	defer func() { SquareClient = origClient }()

	cardToken := "cnon:2fa-tip-newcard-savecard-decline"
	req := CreateTipPaymentRequest{
		Amount:           500,
		NewCardToken:     &cardToken,
		SaveCard:         true,
		IdempotencyKey:   "2fa-tip-newcard-savecard-decline",
	}

	w := makePaymentRequest(withNonGuest(CreateTipPayment), "POST", "/api/bookings/"+bookingID+"/tip", req, userToken, ctx)
	require.Equal(t, http.StatusPaymentRequired, w.Code, "a token-less new-card + save_card tip charge must be refused 402 verification_required (SCA-only), body: %s", w.Body.String())

	var hash sql.NullString
	require.NoError(t, tx.QueryRow(ctx, "SELECT two_factor_pending_code_hash FROM users WHERE id = $1", userID).Scan(&hash))
	require.True(t, hash.Valid, "the pending 2FA code must survive a refused token-less charge")
	require.Equal(t, twofa.Hash("999002"), hash.String, "the save gate must not consume the code — it was never consulted")
}