<?php
/**
 * wevia-decisions-api.php · V92 · Memoire cross-session WEVIA
 * Opus Yacine 19avr · lit la table wevia_decisions PG paperclip
 */
header('Content-Type: application/json; charset=utf-8');
header('Cache-Control: no-store');

$action = $_GET['action'] ?? 'list';
$limit = min(100, intval($_GET['limit'] ?? 20));
$topic = $_GET['topic'] ?? null;
$opus = $_GET['opus'] ?? null;

$pg_conn = "host=127.0.0.1 port=5432 dbname=paperclip user=admin password=admin123";
$conn = @pg_connect($pg_conn);
if (!$conn) {
    echo json_encode(['ok'=>false, 'error'=>'PG connection failed']);
    exit;
}

switch ($action) {
    case 'list':
        $sql = "SELECT id, ts, opus_id, decision_type, topic, decision, impact, status, tags FROM wevia_decisions";
        $conditions = [];
        $params = [];
        $i = 1;
        if ($topic) { $conditions[] = "topic ILIKE \$$i"; $params[] = '%' . $topic . '%'; $i++; }
        if ($opus) { $conditions[] = "opus_id = \$$i"; $params[] = $opus; $i++; }
        if ($conditions) $sql .= " WHERE " . implode(" AND ", $conditions);
        $sql .= " ORDER BY ts DESC LIMIT " . $limit;
        
        $r = @pg_query_params($conn, $sql, $params);
        $items = [];
        if ($r) while ($row = pg_fetch_assoc($r)) $items[] = $row;
        echo json_encode(['ok'=>true, 'action'=>'list', 'count'=>count($items), 'items'=>$items], JSON_PRETTY_PRINT | JSON_UNESCAPED_SLASHES | JSON_UNESCAPED_UNICODE);
        break;
        
    case 'summary':
        $stats_sql = "SELECT 
            COUNT(*) as total,
            COUNT(*) FILTER (WHERE status = 'active') as active,
            COUNT(DISTINCT opus_id) as opus_count,
            COUNT(DISTINCT topic) as topics_count,
            COUNT(*) FILTER (WHERE impact = 'critical') as critical,
            COUNT(*) FILTER (WHERE impact = 'high') as high
            FROM wevia_decisions";
        $r = @pg_query($conn, $stats_sql);
        $stats = $r ? pg_fetch_assoc($r) : [];
        
        $by_opus_sql = "SELECT opus_id, COUNT(*) as n FROM wevia_decisions GROUP BY opus_id ORDER BY n DESC";
        $r = @pg_query($conn, $by_opus_sql);
        $by_opus = [];
        if ($r) while ($row = pg_fetch_assoc($r)) $by_opus[] = $row;
        
        $latest_sql = "SELECT topic, opus_id, impact, ts FROM wevia_decisions ORDER BY ts DESC LIMIT 5";
        $r = @pg_query($conn, $latest_sql);
        $latest = [];
        if ($r) while ($row = pg_fetch_assoc($r)) $latest[] = $row;
        
        echo json_encode([
            'ok' => true,
            'action' => 'summary',
            'stats' => $stats,
            'by_opus' => $by_opus,
            'latest' => $latest,
        ], JSON_PRETTY_PRINT | JSON_UNESCAPED_SLASHES);
        break;
        
    default:
        echo json_encode(['ok'=>false, 'error'=>'Unknown action · use list|summary']);
}

pg_close($conn);