<?php
declare(strict_types=1);

namespace Unsupervised\Schedular\Tests\Unit\Payment;

use Brain\Monkey\Functions;
use Unsupervised\Schedular\Payment\PaymentDueEmailTemplate;
use Unsupervised\Schedular\Tests\Unit\TestCase;

class PaymentDueEmailTemplateTest extends TestCase
{
    public function testFallsBackToDefaultsWhenUnset(): void
    {
        Functions\when('get_option')->alias(static fn (string $name, $default = '') => '');

        $template = new PaymentDueEmailTemplate();

        self::assertSame(PaymentDueEmailTemplate::defaultSubject(), $template->subject());
        self::assertSame(PaymentDueEmailTemplate::defaultBody(), $template->body());
        self::assertSame(PaymentDueEmailTemplate::defaultItemLine(), $template->itemLine());
    }

    public function testReadsStoredValues(): void
    {
        Functions\when('get_option')->alias(static function (string $name) {
            return match ($name) {
                PaymentDueEmailTemplate::OPT_SUBJECT   => 'Custom subject',
                PaymentDueEmailTemplate::OPT_BODY      => 'Custom body {items}',
                PaymentDueEmailTemplate::OPT_ITEM_LINE => '{label}: {amount}',
                default                                => '',
            };
        });

        $template = new PaymentDueEmailTemplate();

        self::assertSame('Custom subject', $template->subject());
        self::assertSame('Custom body {items}', $template->body());
        self::assertSame('{label}: {amount}', $template->itemLine());
    }

    public function testRenderSubstitutesTokens(): void
    {
        Functions\when('get_option')->alias(static function (string $name) {
            return match ($name) {
                PaymentDueEmailTemplate::OPT_SUBJECT => 'Hi {student_name}',
                PaymentDueEmailTemplate::OPT_BODY    => 'Total: {total_due}',
                default                              => '',
            };
        });

        $template = new PaymentDueEmailTemplate();

        self::assertSame('Hi Sam', $template->renderSubject(['{student_name}' => 'Sam']));
        self::assertSame('Total: CAD 10.00', $template->renderBody(['{total_due}' => 'CAD 10.00']));
    }

    public function testSaveWritesOptions(): void
    {
        Functions\expect('update_option')->once()->with(PaymentDueEmailTemplate::OPT_SUBJECT, 'S');
        Functions\expect('update_option')->once()->with(PaymentDueEmailTemplate::OPT_BODY, 'B');
        Functions\expect('update_option')->once()->with(PaymentDueEmailTemplate::OPT_ITEM_LINE, 'I');

        $template = new PaymentDueEmailTemplate();
        $template->saveSubject('S');
        $template->saveBody('B');
        $template->saveItemLine('I');
    }

    public function testDefaultBodyCarriesEveryBlockToken(): void
    {
        $body = PaymentDueEmailTemplate::defaultBody();

        foreach (['{items}', '{credit}', '{total_due}', '{etransfer}', '{reference}'] as $token) {
            self::assertStringContainsString($token, $body);
        }
    }
}