<?php
/**
 * NIS2 Agile - Ingest documento "Guida UI V2 (Bootstrap Italia)" nella KB (RAG)
 * ----------------------------------------------------------------------------
 * Indicizza docs/kb/V2_UI_NAVIGAZIONE.md nella collection Qdrant `nis2_kb` con
 * scope SYSTEM, cosi' che l'assistente AI (ARIA) sappia guidare l'utente nella
 * nuova interfaccia V2 (sidebar, pagine, moduli).
 *
 * ESEGUIRE SU HETZNER (richiede Qdrant + Voyage). NB: il container nis2-app monta
 * SOLO application/ e public/ (NON scripts/), quindi per girare via `docker exec`
 * copiare temporaneamente questo script + il doc sotto application/ ed eseguire:
 *   cp scripts/ingest-v2-ui-doc.php application/_ingest-v2.php
 *   cp docs/kb/V2_UI_NAVIGAZIONE.md application/_v2_ui_doc.md   # + adattare i path a __DIR__
 *   docker exec -i nis2-app php /var/www/nis2-agile/application/_ingest-v2.php
 *   rm application/_ingest-v2.php application/_v2_ui_doc.md
 * (eseguito con successo il 2026-06-12: 8 chunk, scope SYSTEM).
 *
 * Idempotente: cancella i chunk SYSTEM di questa stessa fonte prima del re-upsert.
 * Opzioni: --dry-run  (estrae e mostra le statistiche senza upsert)
 * ============================================================================
 */

if (PHP_SAPI !== 'cli') { fwrite(STDERR, "Solo CLI\n"); exit(1); }

if (!defined('BASE_PATH')) define('BASE_PATH', dirname(__DIR__));
if (!defined('APP_PATH'))  define('APP_PATH', BASE_PATH . '/application');

require_once APP_PATH . '/config/env.php';
require_once APP_PATH . '/config/config.php';
require_once APP_PATH . '/config/database.php';
require_once APP_PATH . '/services/EmbedService.php';
require_once APP_PATH . '/services/VectorService.php';

$opts   = getopt('', ['dry-run']);
$dryRun = isset($opts['dry-run']);

$DOC_FILE = BASE_PATH . '/docs/kb/V2_UI_NAVIGAZIONE.md';
$SOURCE   = 'NIS2 Agile — Guida interfaccia V2 (Bootstrap Italia)';
$TITLE    = 'Interfaccia V2 NIS2 Agile — navigazione e moduli';

function logln(string $m): void { echo '[' . date('Y-m-d H:i:s') . "] $m\n"; }

function chunkText(string $text, int $size = 2000, int $overlap = 200): array
{
    $text = mb_convert_encoding($text, 'UTF-8', 'UTF-8');
    $chunks = []; $len = mb_strlen($text, 'UTF-8'); $start = 0;
    while ($start < $len) {
        $take  = min($size, $len - $start);
        $piece = mb_substr($text, $start, $take, 'UTF-8');
        if (trim($piece) !== '') $chunks[] = $piece;
        if ($start + $take >= $len) break;
        $start += ($size - $overlap);
    }
    return $chunks;
}

function uuid(): string
{
    $b = random_bytes(16);
    $b[6] = chr((ord($b[6]) & 0x0f) | 0x40);
    $b[8] = chr((ord($b[8]) & 0x3f) | 0x80);
    return vsprintf('%s%s-%s-%s-%s-%s%s%s', str_split(bin2hex($b), 4));
}

logln('=== Ingest Guida UI V2 nella KB (scope SYSTEM) ===');
if ($dryRun) logln('MODALITA DRY-RUN: nessun upsert.');

if (!is_file($DOC_FILE)) { logln("ERRORE: doc non trovato {$DOC_FILE}"); exit(1); }
$text = (string) file_get_contents($DOC_FILE);
$text = preg_replace('/[ \t]+/', ' ', $text);
$text = preg_replace('/\n{3,}/', "\n\n", trim($text));
if (strlen($text) < 200) { logln('ERRORE: testo troppo breve.'); exit(1); }

$header = "DOCUMENTO: Guida all'interfaccia V2 di NIS2 Agile (Bootstrap Italia).\n"
        . "USO: aiutare l'utente a navigare la UI, trovare moduli e funzioni.\n\n";
$chunks = chunkText($header . $text, 2000, 200);
logln('  testo: ' . strlen($text) . ' char -> ' . count($chunks) . ' chunk');

if ($dryRun) { logln('=== DRY-RUN completato ==='); exit(0); }

$embed  = new EmbedService();
$vector = new VectorService();
$vector->ensureCollection($embed->dims);

// Idempotenza: rimuovi i chunk SYSTEM esistenti per questa fonte
try {
    $vector->deleteByFilter(['must' => [
        ['key' => 'scope',  'match' => ['value' => 'SYSTEM']],
        ['key' => 'source', 'match' => ['value' => $SOURCE]],
    ]]);
} catch (Exception $e) { logln('  (warning) delete precedente: ' . $e->getMessage()); }

$docUuid = uuid();
$points  = [];
foreach ($chunks as $i => $chunk) {
    $vec = null;
    for ($try = 1; $try <= 5; $try++) {
        try { $vec = $embed->embed($chunk); break; }
        catch (Throwable $e) {
            if ($try === 5) { logln("  ERRORE embed chunk {$i} dopo 5 tentativi: " . $e->getMessage()); throw $e; }
            logln("  retry embed chunk {$i} (tentativo {$try})");
            sleep($try);
        }
    }
    $points[] = [
        'id'     => uuid(),
        'vector' => $vec,
        'payload' => [
            'doc_uuid'           => $docUuid,
            'title'              => $TITLE . ($i > 0 ? ' (parte ' . ($i + 1) . ')' : ''),
            'chunk'              => $chunk,
            'entity_type'        => 'guida_prodotto',
            'source'             => $SOURCE,
            'lang'               => 'it',
            'scope'              => 'SYSTEM',
            'consulting_firm_id' => null,
            'organization_id'    => null,
            'shared_with_orgs'   => [],
            'uploaded_by'        => 0,
        ],
    ];
}
foreach (array_chunk($points, 64) as $batch) {
    $vector->upsertBatch($batch);
}

// Tracking MySQL (best-effort)
try {
    $stmt = Database::getInstance()->prepare(
        "INSERT INTO kb_uploaded_documents
         (qdrant_doc_uuid, scope, consulting_firm_id, organization_id, uploaded_by, title, entity_type, source, lang, chunk_count, shared_with_orgs, status)
         VALUES (?, 'SYSTEM', NULL, NULL, 0, ?, 'guida_prodotto', ?, 'it', ?, '[]', 'ready')"
    );
    $stmt->execute([$docUuid, $TITLE, $SOURCE, count($chunks)]);
} catch (Exception $e) { logln('  (warning) tracking insert: ' . $e->getMessage()); }

logln("=== OK indicizzato: doc_uuid={$docUuid}, " . count($chunks) . " chunk ===");