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<?php
// Slack notify helpers
if (!defined('SLACK_WEBHOOK_URL')) {
  $configPath = __DIR__ . '/config.php';
  if (file_exists($configPath)) require_once $configPath;
}

$GLOBALS['SLACK_LAST_ERROR'] = null;

function slack_enabled(): bool {
  if (!defined('SLACK_WEBHOOK_URL') || SLACK_WEBHOOK_URL === '') return false;
  $u = parse_url(SLACK_WEBHOOK_URL);
  if (!$u || empty($u['scheme']) || strtolower($u['scheme']) !== 'https') return false;
  if (empty($u['host'])) return false;
  // Allow hooks.slack.com or your own proxy if needed; keep loose
  return true;
}

function slack_set_last_error($msg) {
  $GLOBALS['SLACK_LAST_ERROR'] = $msg;
}

function slack_get_last_error() {
  return $GLOBALS['SLACK_LAST_ERROR'];
}

/**
 * Post payload to Slack Incoming Webhook.
 * Returns true on HTTP 2xx, else false and stores reason in slack_get_last_error().
 */
function slack_post(array $payload): bool {
  if (!slack_enabled()) { slack_set_last_error('missing_webhook'); return false; }

if (defined('SLACK_USERNAME') && SLACK_USERNAME) $payload['username'] = SLACK_USERNAME;
  if (defined('SLACK_ICON_EMOJI') && SLACK_ICON_EMOJI) $payload['icon_emoji'] = SLACK_ICON_EMOJI;
  if (defined('SLACK_CHANNEL') && SLACK_CHANNEL) $payload['channel'] = SLACK_CHANNEL;

$json = json_encode($payload, JSON_UNESCAPED_UNICODE | JSON_UNESCAPED_SLASHES);

// Prefer cURL
  if (function_exists('curl_init')) {
    $ch = curl_init(SLACK_WEBHOOK_URL);
    curl_setopt_array($ch, [
      CURLOPT_POST => true,
      CURLOPT_POSTFIELDS => $json,
      CURLOPT_HTTPHEADER => ['Content-Type: application/json'],
      CURLOPT_RETURNTRANSFER => true,
      CURLOPT_CONNECTTIMEOUT => 5,
      CURLOPT_TIMEOUT => 8,
    ]);
    $res = curl_exec($ch);
    $errno = curl_errno($ch);
    $http = curl_getinfo($ch, CURLINFO_HTTP_CODE);
    if ($errno) {
      slack_set_last_error('curl_error:' . $errno . ' ' . curl_error($ch));
      curl_close($ch);
      return false;
    }
    curl_close($ch);
    if ($http < 200 || $http >= 300) {
      slack_set_last_error('http_' . $http);
      return false;
    }
    return true;
  }

// Fallback
  $ctx = stream_context_create([
    'http' => [
      'method' => 'POST',
      'header' => "Content-Type: application/json\r\n",
      'content' => $json,
      'timeout' => 8,
      'ignore_errors' => true,
    ]
  ]);
  $res = @file_get_contents(SLACK_WEBHOOK_URL, false, $ctx);
  if ($res === false) {
    slack_set_last_error('fopen_failed');
    return false;
  }
  // Try to read status line
  if (isset($http_response_header[0]) && strpos($http_response_header[0], '200') === false && strpos($http_response_header[0], '2') !== 0) {
    slack_set_last_error('http_unknown');
    return false;
  }
  return true;
}

function slack_escape(string $s): string {
  return strtr($s, ['&'=>'&','<'=>'<','>'=>'>']);
}

function slack_notify_stock_new(array $alert, ?string $fundName = null): bool {
  $item = $alert['item'] ?? '';
  $note = trim((string)($alert['note'] ?? ''));
  $fund = $fundName ? " *Fund:* " . slack_escape($fundName) . "\n" : '';
  $text = ":bell: *Low stock alert* — " . slack_escape($item);
  if ($note) $text .= " — _" . slack_escape($note) . "_";

$blocks = [
    ['type'=>'header','text'=>['type'=>'plain_text','text'=>'Low stock alert']],
    ['type'=>'section','text'=>['type'=>'mrkdwn','text'=>"*Item:* " . slack_escape($item) . "\n" . $fund . ($note ? "*Note:* " . slack_escape($note) : '')]],
    ['type'=>'context','elements'=>[['type'=>'mrkdwn','text'=>'ID: ' . (int)($alert['id'] ?? 0) . ' • ' . date('Y-m-d H:i')]]],
  ];
  return slack_post(['text'=>$text,'blocks'=>$blocks]);
}

function slack_notify_stock_update(array $alert, string $action, ?string $fundName = null): bool {
  $verb = $action === 'resolve' ? 'Resolved' : 'Acknowledged';
  $item = $alert['item'] ?? '';
  $note = trim((string)($alert['note'] ?? ''));
  $fund = $fundName ? " *Fund:* " . slack_escape($fundName) . "\n" : '';
  $text = ($action === 'resolve' ? ':white_check_mark:' : ':warning:') . " *$verb:* " . slack_escape($item);
  if ($note) $text .= " — _" . slack_escape($note) . "_";

$blocks = [
    ['type'=>'section','text'=>['type'=>'mrkdwn','text'=>"*$verb*\n*Item:* " . slack_escape($item) . "\n" . $fund . ($note ? "*Note:* " . slack_escape($note) : '')]],
    ['type'=>'context','elements'=>[['type'=>'mrkdwn','text'=>date('Y-m-d H:i')]]],
  ];
  return slack_post(['text'=>$text,'blocks'=>$blocks]);
}