portal-api/tests/Feature/Payment/InvoicePaymentServiceTest.php

<?php

declare(strict_types=1);

namespace Tests\Feature\Payment;

use App\Enums\Invoice\InvoiceStatus;
use App\Enums\Order\OrderStatus;
use App\Models\Customer;
use App\Models\Invoice;
use App\Models\Order;
use App\Models\Transaction;
use App\Services\InvoicePaymentService;
use Illuminate\Foundation\Testing\RefreshDatabase;
use Tests\TestCase;

class InvoicePaymentServiceTest extends TestCase
{
    use RefreshDatabase;

    public function test_paying_an_already_paid_invoice_does_not_double_deduct_balance(): void
    {
        $customer = Customer::factory()->create(['total' => 200_000]);
        $order = Order::create([
            'order_num' => 'ORD-' . uniqid(),
            'customer_id' => $customer->id,
            'sub_total' => 100_000,
            'total' => 100_000,
            'status' => OrderStatus::PENDING->value,
        ]);
        $invoice = Invoice::create([
            'invoice_number' => 'INV-' . uniqid(),
            'customer_id' => $customer->id,
            'order_id' => $order->id,
            'invoice_type' => 1,
            'sub_total' => 100_000,
            'tax' => 0,
            'total' => 100_000,
            'status' => InvoiceStatus::UNPAID->value,
        ]);

        $service = app(InvoicePaymentService::class);

        $service->payWithBalance($invoice, $customer, 'balance');
        // Simulate a retried request (double-click / network retry) for the same invoice.
        $service->payWithBalance($invoice->fresh(), $customer->fresh(), 'balance');

        $this->assertSame(100_000, (int) $customer->fresh()->total);
        $this->assertSame(1, Transaction::where('customer_id', $customer->id)->where('type', 'invoice')->count());
    }

    public function test_a_cancelled_invoice_cannot_be_paid_and_is_never_counted_as_paid(): void
    {
        $customer = Customer::factory()->create(['total' => 200_000]);
        $order = Order::create([
            'order_num' => 'ORD-' . uniqid(),
            'customer_id' => $customer->id,
            'sub_total' => 100_000,
            'total' => 100_000,
            'status' => OrderStatus::CANCELLED->value,
        ]);
        $invoice = Invoice::create([
            'invoice_number' => 'INV-' . uniqid(),
            'customer_id' => $customer->id,
            'order_id' => $order->id,
            'invoice_type' => 1,
            'sub_total' => 100_000,
            'tax' => 0,
            'total' => 100_000,
            'status' => InvoiceStatus::CANCELLED->value,
        ]);

        $service = app(InvoicePaymentService::class);

        $this->expectException(\InvalidArgumentException::class);
        try {
            $service->payWithBalance($invoice, $customer, 'balance');
        } finally {
            $this->assertSame(200_000, (int) $customer->fresh()->total);
            $this->assertSame(InvoiceStatus::CANCELLED->value, (int) $invoice->fresh()->status);
            $this->assertNull($invoice->fresh()->paid_at);
        }
    }

    /** Guard mới: admin không được bật hoá đơn đã huỷ sang đã thanh toán. */
    public function test_admin_cannot_mark_a_cancelled_invoice_as_paid(): void
    {
        $customer = Customer::factory()->create(['total' => 200_000]);
        $invoice = $this->makeInvoice($customer, 100_000, InvoiceStatus::CANCELLED->value);

        $this->expectException(\InvalidArgumentException::class);
        try {
            app(InvoicePaymentService::class)->markPaidByAdmin($invoice, null);
        } finally {
            $this->assertSame(InvoiceStatus::CANCELLED->value, (int) $invoice->fresh()->status);
            $this->assertNull($invoice->fresh()->paid_at);
        }
    }

    /** Trả thiếu: cộng dồn amount_paid, hoá đơn vẫn chưa thanh toán, dịch vụ chưa kích hoạt. */
    public function test_partial_payment_records_amount_paid_and_keeps_invoice_unpaid(): void
    {
        $customer = Customer::factory()->create(['total' => 200_000]);
        $invoice = $this->makeInvoice($customer, 100_000);

        $service = app(InvoicePaymentService::class);
        $invoice = $service->payWithBalance($invoice, $customer, 'balance', 40_000);

        $this->assertSame(40_000, (int) $invoice->amount_paid);
        $this->assertSame(InvoiceStatus::UNPAID->value, (int) $invoice->status);
        $this->assertNull($invoice->paid_at);
        $this->assertSame(60_000, InvoicePaymentService::outstanding($invoice));
        $this->assertSame(160_000, (int) $customer->fresh()->total);
        $this->assertSame(OrderStatus::PENDING->value, (int) $invoice->order->fresh()->status);
    }

    /** Trả nốt phần còn thiếu thì hoá đơn mới chuyển PAID và đơn hàng mới được kích hoạt. */
    public function test_paying_the_remainder_settles_the_invoice(): void
    {
        $customer = Customer::factory()->create(['total' => 200_000]);
        $invoice = $this->makeInvoice($customer, 100_000);

        $service = app(InvoicePaymentService::class);
        $service->payWithBalance($invoice, $customer, 'balance', 40_000);
        $invoice = $service->payWithBalance($invoice->fresh(), $customer->fresh(), 'balance');

        $this->assertSame(100_000, (int) $invoice->amount_paid);
        $this->assertSame(InvoiceStatus::PAID->value, (int) $invoice->status);
        $this->assertNotNull($invoice->paid_at);
        $this->assertSame(100_000, (int) $customer->fresh()->total);
        $this->assertSame(OrderStatus::ACTIVE->value, (int) $invoice->order->fresh()->status);
        // Mỗi lần trả là một dòng sổ riêng, không gộp cũng không ghi đè.
        $this->assertSame(2, Transaction::where('customer_id', $customer->id)->where('type', 'invoice')->count());
    }

    /** Trả quá số còn thiếu thì chỉ trừ đúng phần còn thiếu, không thu dư. */
    public function test_overpaying_only_charges_the_outstanding_amount(): void
    {
        $customer = Customer::factory()->create(['total' => 500_000]);
        $invoice = $this->makeInvoice($customer, 100_000);

        $invoice = app(InvoicePaymentService::class)->payWithBalance($invoice, $customer, 'balance', 300_000);

        $this->assertSame(100_000, (int) $invoice->amount_paid);
        $this->assertSame(400_000, (int) $customer->fresh()->total);
    }

    /** Hoàn tiền: cộng lại số dư, ghi Transaction âm, hoá đơn sang REFUNDED. */
    public function test_refund_returns_balance_and_records_a_negative_transaction(): void
    {
        $customer = Customer::factory()->create(['total' => 200_000]);
        $invoice = $this->makeInvoice($customer, 100_000);

        $service = app(InvoicePaymentService::class);
        $invoice = $service->payWithBalance($invoice, $customer, 'balance');
        $this->assertSame(100_000, (int) $customer->fresh()->total);

        $invoice = $service->refund($invoice, null, null, 'Khách huỷ dịch vụ');

        $this->assertSame(InvoiceStatus::REFUNDED->value, (int) $invoice->status);
        $this->assertSame(200_000, (int) $customer->fresh()->total);
        $this->assertSame(
            -100_000,
            (int) Transaction::where('customer_id', $customer->id)->where('type', 'refund')->value('amount'),
        );
    }

    private function makeInvoice(Customer $customer, int $total, int $status = InvoiceStatus::UNPAID->value): Invoice
    {
        $order = Order::create([
            'order_num' => 'ORD-' . uniqid(),
            'customer_id' => $customer->id,
            'sub_total' => $total,
            'total' => $total,
            'status' => OrderStatus::PENDING->value,
        ]);

        return Invoice::create([
            'invoice_number' => 'INV-' . uniqid(),
            'customer_id' => $customer->id,
            'order_id' => $order->id,
            'invoice_type' => 1,
            'sub_total' => $total,
            'tax' => 0,
            'total' => $total,
            'status' => $status,
        ]);
    }
}