<?php
// WEVIA Vault Context Loader — CACHED version (no recursive scan per request)
function wevia_vault_context($message, $maxNotes = 3) {
    $VAULT = '/opt/obsidian-vault';
    $cache = '/tmp/vault-context-cache.json';
    
    // Use cache if < 5 min old
    if (file_exists($cache) && (time() - filemtime($cache)) < 300) {
        $index = json_decode(file_get_contents($cache), true) ?: [];
    } else {
        // Rebuild cache
        $index = [];
        foreach (['doctrines','infra','kb','decisions','arena','ethica'] as $dir) {
            $d = "$VAULT/$dir";
            if (!is_dir($d)) continue;
            foreach (glob("$d/*.md") as $f) {
                $content = file_get_contents($f);
                if (preg_match('/---.*?---\s*(.*)/s', $content, $m)) $content = $m[1];
                $rel = str_replace("$VAULT/", '', $f);
                $index[$rel] = strtolower(substr($content, 0, 500));
            }
        }
        @file_put_contents($cache, json_encode($index));
    }
    
    // Always inject 2 critical doctrines (tiny)
    $ctx = '';
    foreach (['doctrines/souverainete.md','doctrines/paradigme-ultime.md'] as $f) {
        if (isset($index[$f])) $ctx .= substr($index[$f], 0, 150) . "\n";
    }
    
    // Keyword match from cache (no file I/O)
    $words = array_filter(explode(' ', strtolower($message)), fn($w) => strlen($w) >= 4);
    $found = 0;
    foreach ($index as $file => $content) {
        if ($found >= $maxNotes) break;
        foreach ($words as $kw) {
            if (strpos($content, $kw) !== false) {
                $ctx .= "[VAULT:$file] " . substr($content, 0, 200) . "\n";
                $found++;
                break;
            }
        }
    }
    
    return $ctx ? "\n[VAULT CONTEXT]\n$ctx" : '';
}