<?php

declare(strict_types=1);

namespace Tests\Unit;

use PHPUnit\Framework\TestCase;
use App\Services\TaxValidationService;

final class TaxValidationTest extends TestCase
{
    private TaxValidationService $service;

    protected function setUp(): void
    {
        $this->service = new TaxValidationService();
    }

    public function test_it_validates_standard_invoice(): void
    {
        $invoice = [
            'invoice_number' => 'INV-001',
            'invoice_date' => date('Y-m-d'),
            'subtotal' => 100,
            'discount_total' => 0,
            'grand_total' => 116
        ];
        $lines = [
            ['line_number' => 1, 'quantity' => 1, 'unit_price' => 100, 'tax_rate' => 0.16, 'tax_amount' => 16, 'line_total' => 116]
        ];

        $result = $this->service->validate($invoice, $lines);
        $this->assertTrue($result['is_valid']);
    }

    public function test_it_detects_mismatching_totals(): void
    {
        $invoice = [
            'invoice_number' => 'INV-002',
            'invoice_date' => date('Y-m-d'),
            'subtotal' => 100,
            'discount_total' => 0,
            'grand_total' => 110 // Mismatch
        ];
        $lines = [
            ['line_number' => 1, 'quantity' => 1, 'unit_price' => 100, 'tax_rate' => 0.16, 'tax_amount' => 16, 'line_total' => 116]
        ];

        $result = $this->service->validate($invoice, $lines);
        $this->assertFalse($result['is_valid']);
    }
}