<?php
declare(strict_types=1);

final class Lang
{
    /** @var array<string,string> */
    private array $map;

    /**
     * @param array<string,string> $map
     */
    private function __construct(array $map)
    {
        $this->map = $map;
    }

    public static function load(string $code): self
    {
        $code = strtolower(trim($code));
        if ($code !== 'pl' && $code !== 'en') {
            $code = 'en';
        }

        $path = PLUGIN_ROOT . '/lang/' . $code . '.php';
        if (!is_file($path)) {
            $path = PLUGIN_ROOT . '/lang/en.php';
        }

        $map = [];
        if (is_file($path)) {
            $data = require $path;
            if (is_array($data)) {
                $map = $data;
            }
        }

        return new self($map);
    }

    /**
     * @param array<string,string|int|float> $vars
     */
    public function t(string $key, array $vars = []): string
    {
        $text = $this->map[$key] ?? $key;
        foreach ($vars as $var => $value) {
            $text = str_replace('{' . $var . '}', (string)$value, $text);
        }
        return $text;
    }

    public function translateHtml(string $html): string
    {
        if ($html === '' || empty($this->map)) {
            return $html;
        }

        $keys = array_keys($this->map);
        usort($keys, static function (string $a, string $b): int {
            return strlen($b) <=> strlen($a);
        });

        $values = [];
        foreach ($keys as $key) {
            $values[] = $this->map[$key];
        }

        return str_replace($keys, $values, $html);
    }

    /**
     * @return string[]
     */
    public function keys(): array
    {
        return array_keys($this->map);
    }
}