<?php

function has_cyrillic(string $s): bool
{
    return (bool) preg_match('/\p{Cyrillic}/u', $s);
}

function norm_key(string $s): string
{
    $s = mb_strtolower(trim($s), 'UTF-8');
    $s = str_replace(['ё'], ['е'], $s);
    $s = preg_replace('/[\'"’\-\s]+/u', '', $s);
    return $s;
}

// Translittération simple RU -> latin (fallback si intl n’est pas dispo)
function translit_ru_to_lat(string $s): string
{
    if (class_exists('Transliterator')) {
        $t = \Transliterator::create('Russian-Latin/BGN; Lower();');
        if ($t) {
            return $t->transliterate($s);
        }
    }

    $map = [
        'а' => 'a', 'б'  => 'b', 'в'    => 'v', 'г'  => 'g', 'д'  => 'd',
        'е' => 'e', 'ё'  => 'e', 'ж'    => 'zh', 'з' => 'z', 'и'  => 'i',
        'й' => 'i', 'к'  => 'k', 'л'    => 'l', 'м'  => 'm', 'н'  => 'n',
        'о' => 'o', 'п'  => 'p', 'р'    => 'r', 'с'  => 's', 'т'  => 't',
        'у' => 'u', 'ф'  => 'f', 'х'    => 'kh', 'ц' => 'ts', 'ч' => 'ch',
        'ш' => 'sh', 'щ' => 'shch', 'ъ' => '', 'ы'   => 'y', 'ь'  => '',
        'э' => 'e', 'ю'  => 'yu', 'я'   => 'ya',
    ];

    $s = mb_strtolower($s, 'UTF-8');
    return strtr($s, $map);
}

// Retourne une liste de candidats latins (pour LIKE) à partir d’une saisie ville
function city_query_candidates(string $q): array
{
    $q = trim($q);
    if ($q === '') {
        return [];
    }

    $aliases = @include __DIR__ . '/city_aliases_ru.php';
    if (! is_array($aliases)) {
        $aliases = [];
    }

    $cands  = [];
    $qLower = mb_strtolower($q, 'UTF-8');

    // Toujours garder la saisie brute
    $cands[] = $qLower;

    // Version ASCII/latin normalisée
    $qAscii = $qLower;
    if (class_exists('Transliterator')) {
        $t = \Transliterator::create('Any-Latin; Latin-ASCII; Lower();');
        if ($t) {
            $qAscii = $t->transliterate($qAscii);
        }
    }
    $cands[] = $qAscii;

    // Si saisie en cyrillique : on ajoute les villes latines correspondantes
    if (has_cyrillic($q)) {
        $key = norm_key($q);

        foreach ($aliases as $ru => $lat) {
            if (strpos(norm_key($ru), $key) === 0) {
                $cands[] = mb_strtolower($lat, 'UTF-8');
                $cands[] = mb_strtolower($ru, 'UTF-8');
            }
        }

        $cands[] = translit_ru_to_lat($q);
    }

    // Si saisie en latin : on cherche aussi les correspondances RU depuis les aliases
    foreach ($aliases as $ru => $lat) {
        $latLower = mb_strtolower($lat, 'UTF-8');

        $latAscii = $latLower;
        if (class_exists('Transliterator')) {
            $t = \Transliterator::create('Any-Latin; Latin-ASCII; Lower();');
            if ($t) {
                $latAscii = $t->transliterate($latAscii);
            }
        }

        if (
            strpos($latLower, $qLower) === 0 ||
            strpos($latAscii, $qAscii) === 0
        ) {
            $cands[] = mb_strtolower($ru, 'UTF-8');
            $cands[] = $latLower;
        }
    }

    $res = [];
    foreach (array_unique($cands) as $c) {
        $res[] = mb_strtolower(trim($c), 'UTF-8');
    }

    return array_values(array_unique(array_filter($res)));
}

function seo_slug(string $s): string
{
    $s = trim(mb_strtolower($s, 'UTF-8'));

    if ($s === '') {
        return '';
    }

    if (has_cyrillic($s)) {
        $aliases = @include __DIR__ . '/city_aliases_ru.php';
        if (is_array($aliases)) {
            foreach ($aliases as $ru => $lat) {
                if (norm_key($ru) === norm_key($s)) {
                    $s = $lat;
                    break;
                }
            }
        }

        if (has_cyrillic($s)) {
            $s = translit_ru_to_lat($s);
        }
    }

    if (class_exists('Transliterator')) {
        $t = \Transliterator::create('Any-Latin; Latin-ASCII; Lower();');
        if ($t) {
            $s = $t->transliterate($s);
        }
    }

    $s = str_replace(['œ', 'æ'], ['oe', 'ae'], $s);
    $s = preg_replace('/[^\p{L}\p{N}]+/u', '-', $s);
    $s = trim($s, '-');
    $s = preg_replace('/-+/u', '-', $s);

    return $s;
}

function seo_unslug(string $s): string
{
    $s = trim(mb_strtolower($s, 'UTF-8'));
    $s = str_replace('-', ' ', $s);
    $s = preg_replace('/\s+/u', ' ', $s);
    return trim($s);
}

function seo_spec_map(): array
{
    return [
        'psychologue'         => [
            'db'     => 'психолог',
            'search' => [
                'ru' => 'психолог',
                'fr' => 'psychologue',
                'en' => 'psychologist',
            ],
            'inputs' => ['psychologue', 'psychologues', 'психолог', 'психологи'],
        ],

        'manager'             => [
            'db'     => 'менеджер',
            'search' => [
                'ru' => 'менеджер',
                'fr' => 'manager',
                'en' => 'manager',
            ],
            'inputs' => ['it manager', 'it-manager', 'manager it', 'responsable it', 'it-менеджер', 'ит менеджер'],
        ],

        'construction'        => [
            'db'     => 'строитель',
            'search' => [
                'ru' => 'строитель',
                'fr' => 'construction',
                'en' => 'construction',
            ],
            'inputs' => [
                'строительная компания',
                'строительная фирма',
                'строительство',
                'construction',
                'entreprise de construction',
                'bâtiment',
                'btp',
            ],
        ],

        'pompes-funebres'     => [
            'db'     => 'похоронное',
            'search' => [
                'ru' => 'похоронное',
                'fr' => 'pompes funebres',
                'en' => 'funeral services',
            ],
            'inputs' => [
                'похоронное агентство',
                'похоронное бюро',
                'ритуальные услуги',
                'ритуальное агентство',
                'pompes funebres',
                'pompes-funebres',
                'services funeraires',
                'funerailles',
            ],
        ],

        'avocat'              => [
            'db'     => 'адвокат',
            'search' => [
                'ru' => 'адвокат',
                'fr' => 'avocat',
                'en' => 'lawyer',
            ],
            'inputs' => ['avocat', 'avocats', 'адвокат', 'адвокаты'],
        ],

        'medecin'             => [
            'db'     => 'врач',
            'search' => [
                'ru' => 'врач',
                'fr' => 'medecin',
                'en' => 'doctor',
            ],
            'inputs' => ['medecin', 'medecins', 'médecin', 'médecins', 'врач', 'врачи', 'Врач - стоматолог', 'врач-стоматолог'],
        ],

        'consultant'          => [
            'db'     => 'консультант',
            'search' => [
                'ru' => 'консультант',
                'fr' => 'consultant',
                'en' => 'consultant',
            ],
            'inputs' => ['consultant', 'consultants', 'консультант', 'консультанты', 'Консультант'],
        ],

        'professeur'          => [
            'db'     => 'преподаватель',
            'search' => [
                'ru' => 'преподаватель',
                'fr' => 'professeur',
                'en' => 'teacher',
            ],
            'inputs' => ['professeur', 'professeurs', 'pedagogue', 'pedagogues', 'преподаватель', 'преподаватели', 'педагог', 'педагоги'],
        ],

        'comptable'           => [
            'db'     => 'бухгалтер',
            'search' => [
                'ru' => 'бухгалтер',
                'fr' => 'comptable',
                'en' => 'accountant',
            ],
            'inputs' => ['comptable', 'comptables', 'бухгалтер', 'бухгалтеры'],
        ],

        'traducteur'          => [
            'db'     => 'переводчик',
            'search' => [
                'ru' => 'переводчик',
                'fr' => 'traducteur',
                'en' => 'translator',
            ],
            'inputs' => ['traducteur', 'traducteurs', 'переводчик', 'переводчики'],
        ],

        'notaire'             => [
            'db'     => 'нотариус',
            'search' => [
                'ru' => 'нотариус',
                'fr' => 'notaire',
                'en' => 'notary',
            ],
            'inputs' => ['notaire', 'notaires', 'нотариус', 'нотариусы'],
        ],

        'guide'               => [
            'db'     => 'гид',
            'search' => [
                'ru' => 'гид',
                'fr' => 'guide',
                'en' => 'guide',
            ],
            'inputs' => ['guide', 'guides', 'гид', 'гиды'],
        ],

        'agent-immobilier'    => [
            'db'     => 'риелтор',
            'search' => [
                'ru' => 'риелтор',
                'fr' => 'agent immobilier',
                'en' => 'real estate agent',
            ],
            'inputs' => [
                'Agent immobilier',
                'agent immobilier',
                'agent-immobilier',
                'agents immobiliers',
                'agents-immobiliers',
                'риелтор',
                'риелторы',
            ],
        ],

        'autres-specialistes' => [
            'db'     => '__OTHERS__',
            'inputs' => ['autres specialistes', 'autres-specialistes', 'другие', 'другие специалисты'],
        ],
    ];
}

function seo_spec_slug_from_input(string $input): ?string
{
    $inputSlug = seo_slug($input);

    foreach (seo_spec_map() as $slug => $cfg) {
        foreach (($cfg['inputs'] ?? []) as $candidate) {
            if ($inputSlug === seo_slug((string) $candidate)) {
                return $slug;
            }
        }
    }

    return null;
}

function seo_spec_db_from_slug(string $slug): ?string
{
    $slug = seo_slug($slug);
    $map  = seo_spec_map();

    return $map[$slug]['db'] ?? null;
}

function seo_city_slug_from_input(string $input): string
{
    $input = trim($input);
    if ($input === '') {
        return '';
    }

    $aliases = @include __DIR__ . '/city_aliases_ru.php';
    if (! is_array($aliases)) {
        $aliases = [];
    }

    $key = norm_key($input);

    foreach ($aliases as $ru => $lat) {
        if (norm_key($ru) === $key) {
            return seo_slug((string) $lat);
        }
    }

    return seo_slug($input);
}

function seo_spec_slug_from_key(string $key): ?string
{
    $map = [
        'avocats'      => 'avocat',
        'consultants'  => 'consultant',
        'vrachi'       => 'medecin',
        'psychologues' => 'psychologue',
        'repetitori'   => 'professeur',
        'finance'      => 'comptable',
        'perevod'      => 'traducteur',
        'notarius'     => 'notaire',
        'gid'          => 'guide',
        'rieltori'     => 'agent-immobilier',
        'drugie'       => 'autres-specialistes',
    ];

    return $map[$key] ?? null;
}
function seo_spec_search_value_from_slug(string $slug, string $lang): ?string
{
    $slug = seo_slug($slug);
    $lang = mb_strtolower(trim($lang), 'UTF-8');

    $map = seo_spec_map();
    if (! isset($map[$slug])) {
        return null;
    }

    $cfg = $map[$slug];

    if (isset($cfg['search'][$lang]) && trim((string) $cfg['search'][$lang]) !== '') {
        return trim((string) $cfg['search'][$lang]);
    }

    return $cfg['db'] ?? null;
}