<?php
declare(strict_types=1);

namespace KbAntoraImporter\Antora;

final class AntoraYamlReader
{
    public function parse(string $yaml): array
    {
        $data = [
            'name' => '',
            'title' => '',
            'version' => '',
            'nav' => [],
        ];

        $inNav = false;
        foreach (preg_split('/\R/', $yaml) ?: [] as $line) {
            $trimmed = trim($line);

            if ('' === $trimmed || str_starts_with($trimmed, '#')) {
                continue;
            }

            if (preg_match('/^([a-zA-Z0-9_-]+):\s*(.*)$/', $trimmed, $matches)) {
                $key = $matches[1];
                $value = trim($matches[2], " \"'");
                $inNav = 'nav' === $key;

                if (array_key_exists($key, $data) && 'nav' !== $key) {
                    $data[$key] = $value;
                }

                continue;
            }

            if ($inNav && preg_match('/^-\s*(.+)$/', $trimmed, $matches)) {
                $data['nav'][] = trim($matches[1], " \"'");
            }
        }

        return $data;
    }
}