//go:build test && dev

package payments

// Tests for the CreateTerminalPayment SCA decision model: the VerificationToken
// field (handlers.go:114, validation 440-444, extraction 843-846, gate skip
// 1024, forwarding 1113), the SCA-only token-less refusal (402
// verification_required) on the terminal and till saved-card surfaces, and the
// customer_initiated classification (Square's SCA/liability-shift signal) on
// every saved-card charge site.
//
// Tests that flip REQUIRE_2FA/SQUARE_ENVIRONMENT via t.Setenv stay sequential
// (no t.Parallel) — see the note at the top of twofa_test.go. They use
// SQUARE_ENVIRONMENT=staging (enforced, but square.NewDevClient() returns the
// in-memory mock — helperEnvEnforce2FA's production would panic a dev-build
// NewDevClient, see twofa_gate_consume_test.go).

import (
	"encoding/json"
	"net/http"
	"testing"

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

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

// helperEnvEnforce2FAStaging flips the env to an ENFORCED non-mock Square env
// that still resolves to the in-memory mock client. Saved-card charges are
// SCA-only (the 2FA fallback was removed entirely), so an enforced env refuses
// token-less saved-card charges 402 verification_required.
func helperEnvEnforce2FAStaging(t *testing.T) {
	t.Helper()
	t.Setenv("REQUIRE_2FA", "true")
	t.Setenv("SQUARE_ENVIRONMENT", "staging")
}

// installRecordingClient wraps the dev mock in the shared recording client so
// tests can assert the exact CreatePaymentReq the handler sent to Square.
func installRecordingClient(t *testing.T) *recordingPaymentClient {
	t.Helper()
	origClient := SquareClient
	rec := &recordingPaymentClient{SquareClient: square.NewDevClient()}
	SquareClient = rec
	t.Cleanup(func() { SquareClient = origClient })
	return rec
}

// TestTerminalSavedCard_VerificationToken_Passthrough pins (d): a saved-card
// charge through CreateTerminalPayment forwards the SCA verification token
// verbatim on the CreatePaymentReq.
func TestTerminalSavedCard_VerificationToken_Passthrough(t *testing.T) {
	ctx, tx := testutils.SetupTestTx(t)

	userID, bookingID, _ := setupTestData(t, ctx, tx)
	cardID, err := fixtures.CreateTestPaymentMethod(tx, userID, "ccof:mock_terminal_sca", "VISA", "4242")
	require.NoError(t, err)
	adminID, err := fixtures.CreateTestAdminUser(tx)
	require.NoError(t, err)
	adminToken := jwt.GenerateTestToken(adminID, "admin")

	rec := installRecordingClient(t)

	vrf := "vrf_terminal_sca_1"
	req := CreateTerminalPaymentRequest{
		Amount:            5000,
		PaymentType:       "full",
		PaymentMethod:     strPtr("saved_card"),
		UserSavedCardID:   &cardID,
		IdempotencyKey:    "terminal-sca-passthrough-" + bookingID,
		VerificationToken: &vrf,
	}

	w := makePaymentRequest(CreateTerminalPayment, "POST", "/api/admin/bookings/"+bookingID+"/payment", req, adminToken, ctx)
	require.Equal(t, http.StatusOK, w.Code, w.Body.String())

	rec.mu.Lock()
	got := rec.lastReq.VerificationToken
	rec.mu.Unlock()
	require.Equal(t, vrf, got, "the SCA verification token must be forwarded to Square on the CreatePaymentReq")
}

// TestTerminalSavedCard_VerificationToken_TooLong_Rejected pins (d): an
// oversized verification_token is rejected with 400 by ValidateVerificationToken
// before any charge branch runs.
func TestTerminalSavedCard_VerificationToken_TooLong_Rejected(t *testing.T) {
	ctx, tx := testutils.SetupTestTx(t)

	_, bookingID, _ := setupTestData(t, ctx, tx)
	adminID, err := fixtures.CreateTestAdminUser(tx)
	require.NoError(t, err)
	adminToken := jwt.GenerateTestToken(adminID, "admin")

	big := make([]byte, 600)
	for i := range big {
		big[i] = 'a'
	}
	token := string(big)
	req := CreateTerminalPaymentRequest{
		Amount:            5000,
		PaymentType:       "full",
		PaymentMethod:     strPtr("saved_card"),
		IdempotencyKey:    "terminal-sca-too-long-" + bookingID,
		VerificationToken: &token,
	}

	w := makePaymentRequest(CreateTerminalPayment, "POST", "/api/admin/bookings/"+bookingID+"/payment", req, adminToken, ctx)
	require.Equal(t, http.StatusBadRequest, w.Code, "an oversized verification_token must be rejected with 400, body: %s", w.Body.String())
}

// TestTerminalSavedCard_VerificationToken_Skips2FA pins (d): when the charge
// carries a Square verification_token (SCA performed), the 2FA gate is SKIPPED
// even for a user with NO 2FA setup — a charge that would 403 on the fallback
// path succeeds via the token.
func TestTerminalSavedCard_VerificationToken_Skips2FA(t *testing.T) {
	helperEnvEnforce2FAStaging(t)
	ctx, tx := testutils.SetupTestTx(t)

	userID, bookingID, _ := setupTestData(t, ctx, tx)
	cardID, err := fixtures.CreateTestPaymentMethod(tx, userID, "ccof:mock_terminal_sca_skip", "VISA", "4242")
	require.NoError(t, err)
	adminID, err := fixtures.CreateTestAdminUser(tx)
	require.NoError(t, err)
	adminToken := jwt.GenerateTestToken(adminID, "admin")

	installRecordingClient(t)

	vrf := "vrf_terminal_sca_skip_1"
	req := CreateTerminalPaymentRequest{
		Amount:            5000,
		PaymentType:       "full",
		PaymentMethod:     strPtr("saved_card"),
		UserSavedCardID:   &cardID,
		IdempotencyKey:    "terminal-sca-skip-" + bookingID,
		VerificationToken: &vrf,
	}

	w := makePaymentRequest(CreateTerminalPayment, "POST", "/api/admin/bookings/"+bookingID+"/payment", req, adminToken, ctx)
	require.Equal(t, http.StatusOK, w.Code, "SCA performed — the token must skip the 2FA gate, body: %s", w.Body.String())

	var auditCount int
	require.NoError(t, tx.QueryRow(ctx, `SELECT COUNT(*) FROM admin_audit_log WHERE action_type = '2fa_fallback_charge'`).Scan(&auditCount))
	require.Zero(t, auditCount, "an SCA-authorized terminal charge must not write a 2FA-fallback audit row")
}

// TestTerminalSavedCard_Tokenless_402 pins the SCA-only posture on the terminal
// saved-card surface: a token-less terminal saved-card charge is refused 402
// verification_required even when the card owner holds a valid 2FA code (the
// homegrown 2FA fallback was removed entirely — PSR 2017 reg 100), and no
// 2fa_fallback_charge audit row is written.
func TestTerminalSavedCard_Tokenless_402(t *testing.T) {
	helperEnvEnforce2FAStaging(t)
	ctx, tx := testutils.SetupTestTx(t)

	userID, bookingID, _ := setupTestData(t, ctx, tx)
	seedTwoFAPendingCode(t, tx, userID, "334411")
	cardID, err := fixtures.CreateTestPaymentMethod(tx, userID, "ccof:mock_terminal_sca_fallback", "VISA", "4242")
	require.NoError(t, err)
	adminID, err := fixtures.CreateTestAdminUser(tx)
	require.NoError(t, err)
	adminToken := jwt.GenerateTestToken(adminID, "admin")

	installRecordingClient(t)

	req := CreateTerminalPaymentRequest{
		Amount:           5000,
		PaymentType:      "full",
		PaymentMethod:    strPtr("saved_card"),
		UserSavedCardID:  &cardID,
		IdempotencyKey:   "terminal-tokenless-" + bookingID,
	}

	w := makePaymentRequest(CreateTerminalPayment, "POST", "/api/admin/bookings/"+bookingID+"/payment", req, adminToken, ctx)
	require.Equal(t, http.StatusPaymentRequired, w.Code, "a token-less terminal saved-card charge must be refused 402 (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 auditCount int
	require.NoError(t, tx.QueryRow(ctx, `SELECT COUNT(*) FROM admin_audit_log WHERE action_type = '2fa_fallback_charge'`).Scan(&auditCount))
	require.Zero(t, auditCount, "the 2FA fallback was removed — no fallback audit row may be written")
}

// TestTillSavedCard_Tokenless_402 pins the SCA-only posture on the till saved-
// card surface: an admin till saved-card sale is refused 402
// verification_required even with a valid 2FA code (the 2FA fallback was
// removed entirely), and no fallback audit row is written.
func TestTillSavedCard_Tokenless_402(t *testing.T) {
	helperEnvEnforce2FAStaging(t)
	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, "665544")
	cardID, err := fixtures.CreateTestPaymentMethod(tx, userID, "ccof:mock_till_audit", "VISA", "4242")
	require.NoError(t, err)

	installRecordingClient(t)

	key := "2fa-till-fallback-audit"
	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 sale must be refused 402 (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 auditCount int
	require.NoError(t, tx.QueryRow(ctx, `SELECT COUNT(*) FROM admin_audit_log WHERE action_type = '2fa_fallback_charge'`).Scan(&auditCount))
	require.Zero(t, auditCount, "the 2FA fallback was removed — no fallback audit row may be written")
}

// TestCustomerInitiated_ChargeClassification pins (f): the customer_initiated
// flag on the CreatePaymentReq — false for the ADMIN surfaces (terminal
// saved-card handlers.go:1121, till saved-card till.go:1179: merchant-
// initiated) and true for the CUSTOMER surfaces (booking handlers.go:2467,
// tip handlers.go:4708, gift-card giftcards.go:1676).
func TestCustomerInitiated_ChargeClassification(t *testing.T) {
	t.Run("admin_terminal_saved_card_merchant_initiated", func(t *testing.T) {
		ctx, tx := testutils.SetupTestTx(t)
		userID, bookingID, _ := setupTestData(t, ctx, tx)
		cardID, err := fixtures.CreateTestPaymentMethod(tx, userID, "ccof:mock_ci_terminal", "VISA", "4242")
		require.NoError(t, err)
		adminID, err := fixtures.CreateTestAdminUser(tx)
		require.NoError(t, err)
		adminToken := jwt.GenerateTestToken(adminID, "admin")
		rec := installRecordingClient(t)

		req := CreateTerminalPaymentRequest{
			Amount:          5000,
			PaymentType:     "full",
			PaymentMethod:   strPtr("saved_card"),
			UserSavedCardID: &cardID,
			IdempotencyKey:  "ci-terminal-" + bookingID,
		}
		w := makePaymentRequest(CreateTerminalPayment, "POST", "/api/admin/bookings/"+bookingID+"/payment", req, adminToken, ctx)
		require.Equal(t, http.StatusOK, w.Code, w.Body.String())

		rec.mu.Lock()
		cd := rec.lastReq.CustomerDetails
		rec.mu.Unlock()
		require.NotNil(t, cd, "an admin saved-card terminal charge must carry customer_details")
		require.False(t, cd.CustomerInitiated, "an admin-initiated terminal saved-card charge is merchant-initiated")
	})

	t.Run("admin_till_saved_card_merchant_initiated", func(t *testing.T) {
		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")
		cardID, err := fixtures.CreateTestPaymentMethod(tx, userID, "ccof:mock_ci_till", "VISA", "4242")
		require.NoError(t, err)
		rec := installRecordingClient(t)

		req := TillSaleRequest{
			ItemType:        "gift_card",
			Action:          "create",
			Amount:          50.00,
			PaymentMethod:   "saved_card",
			UserSavedCardID: &cardID,
			UserID:          &userID,
			IdempotencyKey:  "ci-till",
		}
		w := makePaymentRequest(CreateTillSale, "POST", "/api/admin/till/sale", req, adminToken, ctx)
		require.Contains(t, []int{http.StatusOK, http.StatusCreated}, w.Code, w.Body.String())

		rec.mu.Lock()
		cd := rec.lastReq.CustomerDetails
		rec.mu.Unlock()
		require.NotNil(t, cd, "an admin till saved-card charge must carry customer_details")
		require.False(t, cd.CustomerInitiated, "an admin-initiated till saved-card charge is merchant-initiated")
	})

	t.Run("customer_booking_cardholder_initiated", func(t *testing.T) {
		ctx, tx := testutils.SetupTestTx(t)
		userID, bookingID, _ := setupTestData(t, ctx, tx)
		userToken := jwt.GenerateUserToken(userID)
		rec := installRecordingClient(t)

		cardToken := "cnon:ci-booking"
		req := CreateBookingPaymentRequest{
			Amount:         5000,
			PaymentType:    "full",
			NewCardToken:   &cardToken,
			IdempotencyKey: "ci-booking-" + bookingID,
		}
		w := makePaymentRequest(withNonGuest(CreateBookingPayment), "POST", "/api/bookings/"+bookingID+"/payment", req, userToken, ctx)
		require.Equal(t, http.StatusOK, w.Code, w.Body.String())

		rec.mu.Lock()
		cd := rec.lastReq.CustomerDetails
		rec.mu.Unlock()
		require.NotNil(t, cd)
		require.True(t, cd.CustomerInitiated, "a customer booking charge is cardholder-initiated")
	})

	t.Run("customer_tip_cardholder_initiated", func(t *testing.T) {
		ctx, tx := testutils.SetupTestTx(t)
		userID, bookingID, _ := setupTestDataPast(t, ctx, tx)
		userToken := jwt.GenerateUserToken(userID)
		_, err := fixtures.CreateTestPayment(tx, bookingID, 5000.00, "online_square", "full", "completed")
		require.NoError(t, err)
		rec := installRecordingClient(t)

		cardToken := "cnon:ci-tip"
		req := CreateTipPaymentRequest{
			Amount:         500,
			NewCardToken:   &cardToken,
			IdempotencyKey: "ci-tip-" + bookingID,
		}
		w := makePaymentRequest(withNonGuest(CreateTipPayment), "POST", "/api/bookings/"+bookingID+"/tip", req, userToken, ctx)
		require.Equal(t, http.StatusOK, w.Code, w.Body.String())

		rec.mu.Lock()
		cd := rec.lastReq.CustomerDetails
		rec.mu.Unlock()
		require.NotNil(t, cd)
		require.True(t, cd.CustomerInitiated, "a customer tip charge is cardholder-initiated")
	})

	t.Run("customer_gift_card_cardholder_initiated", func(t *testing.T) {
		ctx, tx := testutils.SetupTestTx(t)
		userID, err := fixtures.CreateTestUser(tx)
		require.NoError(t, err)
		token := jwt.GenerateUserToken(userID)
		cardID, err := fixtures.CreateTestPaymentMethod(tx, userID, "ccof:mock_ci_gc", "VISA", "4242")
		require.NoError(t, err)
		rec := installRecordingClient(t)

		req := BuyGiftCardRequest{
			Amount:         2000,
			RecipientType:  "self",
			CardID:         &cardID,
			IdempotencyKey: "ci-gc",
		}
		w := makePaymentRequest(BuyGiftCard, "POST", "/api/user/giftcards/buy", req, token, ctx)
		require.Contains(t, []int{http.StatusOK, http.StatusCreated}, w.Code, w.Body.String())

		rec.mu.Lock()
		cd := rec.lastReq.CustomerDetails
		rec.mu.Unlock()
		require.NotNil(t, cd)
		require.True(t, cd.CustomerInitiated, "a customer gift-card purchase is cardholder-initiated")
	})
}