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/si/_core/memory.php

<?php
declare(strict_types=1);
require_once __DIR__ . '/common.php';

function si_memory_dir(): string
{
    $dir = si_core_private_root() . '/memory';
    if (!is_dir($dir)) @mkdir($dir, 0700, true);
    return $dir;
}

function si_memory_id(string $contact): string
{
    $contact = strtolower(trim($contact));
    return hash('sha256', $contact !== '' ? $contact : 'anonymous');
}

function si_memory_remember(string $channel, string $contact, string $role, string $text, array $meta = []): void
{
    $text = trim($text);
    if ($text === '') return;
    $record = [
        'time' => gmdate('c'),
        'channel' => $channel,
        'contact' => $contact,
        'role' => $role,
        'text' => function_exists('mb_substr') ? mb_substr($text, 0, 4000) : substr($text, 0, 4000),
        'meta' => $meta,
    ];
    $file = si_memory_dir() . '/' . si_memory_id($contact) . '.ndjson';
    @file_put_contents($file, json_encode($record, JSON_UNESCAPED_SLASHES) . PHP_EOL, FILE_APPEND | LOCK_EX);

$index = si_memory_dir() . '/contacts.ndjson';
    @file_put_contents($index, json_encode([
        'time' => $record['time'], 'id' => si_memory_id($contact), 'contact' => $contact,
        'channel' => $channel, 'preview' => substr($text, 0, 180),
    ], JSON_UNESCAPED_SLASHES) . PHP_EOL, FILE_APPEND | LOCK_EX);
}

function si_memory_recent(string $contact, int $limit = 12): array
{
    $file = si_memory_dir() . '/' . si_memory_id($contact) . '.ndjson';
    if (!is_readable($file)) return [];
    $lines = array_slice(file($file, FILE_IGNORE_NEW_LINES | FILE_SKIP_EMPTY_LINES) ?: [], -max(1, min($limit, 50)));
    $rows = [];
    foreach ($lines as $line) { $row = json_decode($line, true); if (is_array($row)) $rows[] = $row; }
    return $rows;
}

function si_memory_context(string $contact, int $limit = 10): string
{
    $rows = si_memory_recent($contact, $limit);
    $parts = [];
    foreach ($rows as $row) $parts[] = strtoupper((string) ($row['role'] ?? 'unknown')) . ': ' . (string) ($row['text'] ?? '');
    return implode("\n", $parts);
}

function si_memory_contact_count(): int
{
    $files = glob(si_memory_dir() . '/*.ndjson') ?: [];
    return max(0, count(array_filter($files, function($f){ return basename($f) !== 'contacts.ndjson'; })));
}

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