<?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
    {
        $data = [
            'invoice_type' => '001', // Standard
            'total_tax_exclusive_amount' => 100,
            'total_tax_amount' => 16,
            'grand_total' => 116,
            'tax_items' => [
                ['tax_percent' => 16, 'tax_amount' => 16, 'taxable_amount' => 100]
            ]
        ];

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

    public function test_it_detects_mismatching_totals(): void
    {
        $data = [
            'invoice_type' => '001',
            'total_tax_exclusive_amount' => 100,
            'total_tax_amount' => 16,
            'grand_total' => 110, // Error: should be 116
            'tax_items' => [
                ['tax_percent' => 16, 'tax_amount' => 16, 'taxable_amount' => 100]
            ]
        ];

        $result = $this->service->validate($data);
        $this->assertFalse($result['is_valid']);
        $this->assertContains('Grand total mismatch', $result['errors']);
    }
}