//go:build test
// +build test

package admin

import (
	"net/http"
	"testing"

	"crussell/testutils"
)

func intPtr(i int) *int             { return &i }
func float64Ptr(f float64) *float64 { return &f }
func boolPtr(b bool) *bool          { return &b }

// TestGetBusinessSettings verifies that GET /api/admin/settings returns the
// current business settings row.
func TestGetBusinessSettings(t *testing.T) {
	ctx, tx := testutils.SetupTestTx(t)

	_, err := tx.Exec(ctx, `UPDATE business_settings SET business_name = 'Test Salon', business_address = '123 Test St', currency_code = 'GBP', gift_card_expiry_months = 12, voucher_type = 'SPV'`)
	if err != nil {
		t.Fatalf("failed to seed business settings: %v", err)
	}

	handler := http.HandlerFunc(GetBusinessSettings)
	w := makeAdminRequest(handler, "GET", "/api/admin/settings", nil, ctx)

	if w.Code != http.StatusOK {
		t.Errorf("expected status 200, got %d. body: %s", w.Code, w.Body.String())
	}

	var s BusinessSettings
	if err := parseResponseBody(w, &s); err != nil {
		t.Fatalf("failed to parse response: %v", err)
	}

	if s.BusinessName != "Test Salon" {
		t.Errorf("expected BusinessName 'Test Salon', got '%s'", s.BusinessName)
	}
	if s.BusinessAddress != "123 Test St" {
		t.Errorf("expected BusinessAddress '123 Test St', got '%s'", s.BusinessAddress)
	}
	if s.CurrencyCode != "GBP" {
		t.Errorf("expected CurrencyCode 'GBP', got '%s'", s.CurrencyCode)
	}
	if s.GiftCardExpiryMonths != 12 {
		t.Errorf("expected GiftCardExpiryMonths 12, got %d", s.GiftCardExpiryMonths)
	}
	if s.VoucherType != "SPV" {
		t.Errorf("expected VoucherType 'SPV', got '%s'", s.VoucherType)
	}
}

// TestUpdateBusinessSettings verifies that updating a single field via
// PUT /api/admin/settings returns 200 with the updated settings.
func TestUpdateBusinessSettings(t *testing.T) {
	ctx, _ := testutils.SetupTestTx(t)

	handler := http.HandlerFunc(UpdateBusinessSettings)
	body := UpdateBusinessSettingsRequest{
		BusinessName: stringPtr("Updated Salon Name"),
	}
	w := makeAdminRequest(handler, "PUT", "/api/admin/settings", body, ctx)

	if w.Code != http.StatusOK {
		t.Errorf("expected status 200, got %d. body: %s", w.Code, w.Body.String())
	}

	var s BusinessSettings
	if err := parseResponseBody(w, &s); err != nil {
		t.Fatalf("failed to parse response: %v", err)
	}

	if s.BusinessName != "Updated Salon Name" {
		t.Errorf("expected BusinessName 'Updated Salon Name', got '%s'", s.BusinessName)
	}
}

// TestUpdateBusinessSettings_MultipleFields verifies that updating several
// fields at once works correctly.
func TestUpdateBusinessSettings_MultipleFields(t *testing.T) {
	ctx, _ := testutils.SetupTestTx(t)

	handler := http.HandlerFunc(UpdateBusinessSettings)
	body := UpdateBusinessSettingsRequest{
		BusinessName:         stringPtr("Multi Update Salon"),
		BusinessAddress:      stringPtr("456 New St"),
		GiftCardExpiryMonths: intPtr(24),
		VoucherType:          stringPtr("MPV"),
	}
	w := makeAdminRequest(handler, "PUT", "/api/admin/settings", body, ctx)

	if w.Code != http.StatusOK {
		t.Errorf("expected status 200, got %d. body: %s", w.Code, w.Body.String())
	}

	var s BusinessSettings
	if err := parseResponseBody(w, &s); err != nil {
		t.Fatalf("failed to parse response: %v", err)
	}

	if s.BusinessName != "Multi Update Salon" {
		t.Errorf("expected BusinessName 'Multi Update Salon', got '%s'", s.BusinessName)
	}
	if s.BusinessAddress != "456 New St" {
		t.Errorf("expected BusinessAddress '456 New St', got '%s'", s.BusinessAddress)
	}
	if s.GiftCardExpiryMonths != 24 {
		t.Errorf("expected GiftCardExpiryMonths 24, got %d", s.GiftCardExpiryMonths)
	}
	if s.VoucherType != "MPV" {
		t.Errorf("expected VoucherType 'MPV', got '%s'", s.VoucherType)
	}
}

// TestUpdateBusinessSettings_InvalidVoucherType verifies that an invalid
// voucher_type value returns 400.
func TestUpdateBusinessSettings_InvalidVoucherType(t *testing.T) {
	ctx, _ := testutils.SetupTestTx(t)

	handler := http.HandlerFunc(UpdateBusinessSettings)
	body := UpdateBusinessSettingsRequest{
		VoucherType: stringPtr("INVALID"),
	}
	w := makeAdminRequest(handler, "PUT", "/api/admin/settings", body, ctx)

	if w.Code != http.StatusBadRequest {
		t.Errorf("expected status 400, got %d. body: %s", w.Code, w.Body.String())
	}
	if w.Body.String() != "voucher_type must be 'SPV' or 'MPV'\n" {
		t.Errorf("unexpected error message: %s", w.Body.String())
	}
}

// TestUpdateBusinessSettings_NegativeExpiryMonths verifies that a
// gift_card_expiry_months value less than 1 returns 400.
func TestUpdateBusinessSettings_NegativeExpiryMonths(t *testing.T) {
	ctx, _ := testutils.SetupTestTx(t)

	handler := http.HandlerFunc(UpdateBusinessSettings)
	body := UpdateBusinessSettingsRequest{
		GiftCardExpiryMonths: intPtr(0),
	}
	w := makeAdminRequest(handler, "PUT", "/api/admin/settings", body, ctx)

	if w.Code != http.StatusBadRequest {
		t.Errorf("expected status 400, got %d. body: %s", w.Code, w.Body.String())
	}
	if w.Body.String() != "gift_card_expiry_months must be at least 1\n" {
		t.Errorf("unexpected error message: %s", w.Body.String())
	}
}

// TestUpdateBusinessSettings_InvalidVATRate verifies that a default_vat_rate
// outside the 0-100 range returns 400.
func TestUpdateBusinessSettings_InvalidVATRate(t *testing.T) {
	ctx, _ := testutils.SetupTestTx(t)

	handler := http.HandlerFunc(UpdateBusinessSettings)

	body := UpdateBusinessSettingsRequest{
		DefaultVATRate: float64Ptr(-1),
	}
	w := makeAdminRequest(handler, "PUT", "/api/admin/settings", body, ctx)

	if w.Code != http.StatusBadRequest {
		t.Errorf("expected status 400 for negative rate, got %d. body: %s", w.Code, w.Body.String())
	}
	if w.Body.String() != "default_vat_rate must be between 0 and 100\n" {
		t.Errorf("unexpected error message: %s", w.Body.String())
	}
	body2 := UpdateBusinessSettingsRequest{
		DefaultVATRate: float64Ptr(101),
	}
	w2 := makeAdminRequest(handler, "PUT", "/api/admin/settings", body2, ctx)

	if w2.Code != http.StatusBadRequest {
		t.Errorf("expected status 400 for rate > 100, got %d. body: %s", w2.Code, w2.Body.String())
	}
	if w2.Body.String() != "default_vat_rate must be between 0 and 100\n" {
		t.Errorf("unexpected error message: %s", w2.Body.String())
	}
}

// TestUpdateBusinessSettings_NoFields verifies that an empty request body
// (no fields to update) returns 400.
func TestUpdateBusinessSettings_NoFields(t *testing.T) {
	ctx, _ := testutils.SetupTestTx(t)

	handler := http.HandlerFunc(UpdateBusinessSettings)
	w := makeAdminRequest(handler, "PUT", "/api/admin/settings", UpdateBusinessSettingsRequest{}, ctx)

	if w.Code != http.StatusBadRequest {
		t.Errorf("expected status 400, got %d. body: %s", w.Code, w.Body.String())
	}
	if w.Body.String() != "No fields to update\n" {
		t.Errorf("unexpected error message: %s", w.Body.String())
	}
}

// TestUpdateBusinessSettings_PartialUpdate verifies that updating a single field
// leaves other fields unchanged.
func TestUpdateBusinessSettings_PartialUpdate(t *testing.T) {
	ctx, tx := testutils.SetupTestTx(t)

	_, err := tx.Exec(ctx, `UPDATE business_settings SET business_name = 'Test Salon', business_address = '123 Test St', currency_code = 'GBP', gift_card_expiry_months = 12, voucher_type = 'SPV'`)
	if err != nil {
		t.Fatalf("failed to seed business settings: %v", err)
	}

	handler := http.HandlerFunc(UpdateBusinessSettings)
	body := UpdateBusinessSettingsRequest{
		GiftCardExpiryMonths: intPtr(36),
	}
	w := makeAdminRequest(handler, "PUT", "/api/admin/settings", body, ctx)

	if w.Code != http.StatusOK {
		t.Errorf("expected status 200, got %d. body: %s", w.Code, w.Body.String())
	}

	var s BusinessSettings
	if err := parseResponseBody(w, &s); err != nil {
		t.Fatalf("failed to parse response: %v", err)
	}

	if s.GiftCardExpiryMonths != 36 {
		t.Errorf("expected GiftCardExpiryMonths 36, got %d", s.GiftCardExpiryMonths)
	}

	if s.BusinessName != "Test Salon" {
		t.Errorf("expected BusinessName 'Test Salon' (unchanged), got '%s'", s.BusinessName)
	}
	if s.BusinessAddress != "123 Test St" {
		t.Errorf("expected BusinessAddress '123 Test St' (unchanged), got '%s'", s.BusinessAddress)
	}
	if s.VoucherType != "SPV" {
		t.Errorf("expected VoucherType 'SPV' (unchanged), got '%s'", s.VoucherType)
	}
	if s.CurrencyCode != "GBP" {
		t.Errorf("expected CurrencyCode 'GBP' (unchanged), got '%s'", s.CurrencyCode)
	}
}