<?php
declare(strict_types=1);

namespace WPMultiCity;

final class ShortcodeDmr
{
    public const SHORTCODE = 'shortcode_dmr';

    private static array $render_cache = [];

    public static function reset_cache(): void
    {
        self::$render_cache = [];
    }

    public static function register(): void
    {
        \add_action('init', [self::class, 'do_register']);
    }

    public static function do_register(): void
    {
        \add_shortcode(self::SHORTCODE, [self::class, 'render']);
    }

    public static function render($atts = [], $content = null): string
    {
        $atts = \shortcode_atts(['id' => 0], (array) $atts);
        $id = (int) $atts['id'];
        if ($id <= 0) {
            return '';
        }

        $town_slug = Helpers::current_town();
        if ($town_slug === null) {
            return '';
        }

        $cache_key = $id . '|' . $town_slug;
        if (array_key_exists($cache_key, self::$render_cache)) {
            return self::$render_cache[$cache_key];
        }

        $term = Helpers::get_term_by_slug($town_slug);
        if ($term === null) {
            return self::$render_cache[$cache_key] = '';
        }

        $rows = \get_field('list_shortcode', $id);
        if (!is_array($rows) || $rows === []) {
            return self::$render_cache[$cache_key] = '';
        }

        foreach ($rows as $row) {
            if (!is_array($row) || !isset($row['town'])) {
                continue;
            }
            if ((int) $row['town'] === (int) $term->term_id) {
                $text = isset($row['text']) ? (string) $row['text'] : '';
                return self::$render_cache[$cache_key] = $text;
            }
        }

        return self::$render_cache[$cache_key] = '';
    }
}