<?php
declare(strict_types=1);
/** Public site translations: only manually approved records are shown. */
function polana_site_translation_columns(): array
{
    return [
        'home_title' => 'Tytuł SEO strony głównej',
        'home_description' => 'Opis SEO strony głównej',
        'home_lead' => 'Lead strony głównej',
        'home_about_title' => 'Nagłówek O nas',
        'home_about_text' => 'Tekst O nas',
        'contact_title' => 'Tytuł SEO kontaktu',
        'contact_description' => 'Opis SEO kontaktu',
        'opening_hours' => 'Godziny otwarcia',
        'site_splash_badge' => 'Zaślepka – etykieta',
        'site_splash_title' => 'Zaślepka – nagłówek',
        'site_splash_text' => 'Zaślepka – opis',
        'site_splash_note' => 'Zaślepka – stopka',
    ];
}

function polana_site_translation_hash(string $scope, string $source): string
{
    return hash('sha256', $scope . "\0" . $source);
}

function polana_site_translation_ready(): bool
{
    static $ready = null;
    if ($ready !== null) return $ready;
    try {
        $ready = (bool)db()->query("SHOW TABLES LIKE 'polana_site_translations'")->fetchColumn();
    } catch (Throwable $e) {
        error_log('[POLANA_I18N_SCHEMA] ' . $e->getMessage());
        $ready = false;
    }
    return $ready;
}

function polana_site_translation_create(): void
{
    db()->exec("CREATE TABLE IF NOT EXISTS polana_site_translations (
        translation_id CHAR(64) CHARACTER SET ascii COLLATE ascii_bin PRIMARY KEY,
        scope VARCHAR(20) NOT NULL,
        source_text MEDIUMTEXT NOT NULL,
        translated_text MEDIUMTEXT NOT NULL,
        state ENUM('draft','published') NOT NULL DEFAULT 'draft',
        reviewed_at DATETIME NULL,
        updated_at DATETIME NOT NULL DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP,
        INDEX idx_state (scope, state)
    ) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_unicode_ci");
}

/** Single SELECT per public request; never publish draft machine text. */
function polana_site_translation_cache(): array
{
    static $cache = null;
    if ($cache !== null) return $cache;
    $cache = [];
    if (!polana_site_translation_ready()) return $cache;
    try {
        foreach (db()->query("SELECT translation_id, scope, source_text, translated_text FROM polana_site_translations WHERE state='published'") as $record) {
            $cache[(string)$record['translation_id']] = $record;
        }
    } catch (Throwable $e) { error_log('[POLANA_I18N_READ] '.$e->getMessage()); }
    return $cache;
}

function polana_site_translation_published(string $scope, string $source): ?string
{
    if ($source === '') return null;
    $record = polana_site_translation_cache()[polana_site_translation_hash($scope, $source)] ?? null;
    if (!is_array($record)) return null;
    // If the source text changed after approval, an old translation must not remain approved.
    if ($scope === 'setting' && (string)$record['source_text'] !== $source &&
        (string)$record['source_text'] !== trim(setting($source))) return null;
    $value = $record['translated_text'] ?? null;
    return is_string($value) && trim($value) !== '' ? $value : null;
}

/** A reviewed override takes precedence; manually maintained *_en setting is next. */
function polana_site_setting(string $key, string $default = '', string $englishFallback = ''): string
{
    $pl = setting($key, $default);
    if (polana_lang() !== 'en' || $pl === '') return $pl;
    $published = polana_site_translation_published('setting', $key);
    if ($published !== null) return $published;
    $configuredEnglish = setting($key.'_en');
    return $configuredEnglish !== '' ? $configuredEnglish : ($englishFallback !== '' ? $englishFallback : $pl);
}