<?php
// V37 DG Alert ACK API · doctrine 60 UX premium · reglage alertes business
// POST ?title=X&expires_h=24&note=...
header('Content-Type: application/json');
header('Access-Control-Allow-Origin: *');

$ACK_FILE = '/tmp/dg-alerts-ack.json';

$method = $_SERVER['REQUEST_METHOD'] ?? 'GET';
$action = $_GET['action'] ?? ($_POST['action'] ?? 'list');

$acks = [];
if (file_exists($ACK_FILE)) {
    $raw = @file_get_contents($ACK_FILE);
    $decoded = @json_decode($raw, true);
    if (is_array($decoded)) $acks = $decoded;
}

if ($action === 'ack' && $method === 'POST') {
    $title = $_POST['title'] ?? '';
    $expires_h = (int)($_POST['expires_h'] ?? 24);
    $note = $_POST['note'] ?? 'acknowledged via DG';
    $owner = $_POST['owner'] ?? 'Yacine';
    
    if (empty($title)) {
        echo json_encode(['error' => 'title required']);
        exit;
    }
    
    $key = md5($title);
    $acks[$key] = [
        'title' => $title,
        'ts' => date('c'),
        'expires_h' => $expires_h,
        'note' => $note,
        'owner' => $owner
    ];
    
    @file_put_contents($ACK_FILE, json_encode($acks, JSON_PRETTY_PRINT));
    echo json_encode(['ok' => true, 'key' => $key, 'acked' => true, 'expires_h' => $expires_h]);
    exit;
}

if ($action === 'unack' && $method === 'POST') {
    $title = $_POST['title'] ?? '';
    $key = md5($title);
    unset($acks[$key]);
    @file_put_contents($ACK_FILE, json_encode($acks, JSON_PRETTY_PRINT));
    echo json_encode(['ok' => true, 'unacked' => true]);
    exit;
}

if ($action === 'clear' && $method === 'POST') {
    @unlink($ACK_FILE);
    echo json_encode(['ok' => true, 'cleared' => true]);
    exit;
}

// Default: list
echo json_encode(['acks' => $acks, 'count' => count($acks), 'ts' => date('c')]);