<?php
declare(strict_types=1);

$app = app();
$pdo = $app->pdo();
$userId = $_SESSION['user_id'] ?? null;
$error = '';

if ($_SERVER['REQUEST_METHOD'] === 'POST' && isset($_POST['action']) && $_POST['action'] === 'thread_create') {
    if (!$userId) {
        $error = 'Bitte einloggen, um Fragen zu stellen.';
    } elseif ($pdo) {
        $title = trim((string)($_POST['title'] ?? ''));
        $body  = trim((string)($_POST['body'] ?? ''));
        if ($title === '' || $body === '') {
            $error = 'Titel und Text sind erforderlich.';
        } else {
            $pdo->prepare('CREATE TABLE IF NOT EXISTS forum_threads (
              id BIGINT UNSIGNED AUTO_INCREMENT PRIMARY KEY,
              user_id BIGINT UNSIGNED NOT NULL,
              title VARCHAR(200) NOT NULL,
              body TEXT NOT NULL,
              created_at DATETIME NOT NULL DEFAULT CURRENT_TIMESTAMP,
              updated_at DATETIME NOT NULL DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP
            ) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_unicode_ci')->execute();
            $pdo->prepare('INSERT INTO forum_threads (user_id, title, body) VALUES (:uid, :title, :body)')
                ->execute(['uid' => $userId, 'title' => $title, 'body' => $body]);
            header('Location: /community');
            exit;
        }
    }
}

$threads = [];
$configCommunity = require __DIR__ . '/../../config/community.php';
$pointsCfg = $configCommunity['points'] ?? [];
$levelsCfg = $configCommunity['levels'] ?? [];
$search = trim((string)($_GET['q'] ?? ''));
if ($pdo) {
    $pdo->prepare('CREATE TABLE IF NOT EXISTS forum_posts (
      id BIGINT UNSIGNED AUTO_INCREMENT PRIMARY KEY,
      thread_id BIGINT UNSIGNED NOT NULL,
      user_id BIGINT UNSIGNED NOT NULL,
      body TEXT NOT NULL,
      created_at DATETIME NOT NULL DEFAULT CURRENT_TIMESTAMP,
      updated_at DATETIME NOT NULL DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP,
      INDEX idx_thread (thread_id)
    ) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_unicode_ci')->execute();

    $conditions = [];
    $params = [];
    if ($search !== '') {
        $tokens = preg_split('/\\s+/', $search);
        $i = 0;
        foreach ($tokens as $tok) {
            $tok = trim($tok);
            if ($tok === '') continue;
            $ph1 = 't' . $i . '_title';
            $ph2 = 't' . $i . '_body';
            $i++;
            $conditions[] = "(ft.title LIKE :$ph1 OR ft.body LIKE :$ph2)";
            $params[$ph1] = '%' . $tok . '%';
            $params[$ph2] = '%' . $tok . '%';
        }
    }
    $whereSearch = $conditions ? ('AND ' . implode(' AND ', $conditions)) : '';

    $sql = "SELECT ft.id, ft.title, ft.body, ft.created_at,
                   u.id as uid, u.created_at as user_created,
                   p.display_name,
                   (SELECT COUNT(*) FROM forum_posts fp WHERE fp.thread_id = ft.id) AS answers,
                   (SELECT COUNT(*) FROM forum_posts fp2 WHERE fp2.user_id = u.id) +
                   (SELECT COUNT(*) FROM forum_threads ft2 WHERE ft2.user_id = u.id) AS user_posts
            FROM forum_threads ft
            JOIN users u ON u.id = ft.user_id
            LEFT JOIN user_profiles p ON p.user_id = u.id
            WHERE 1=1 $whereSearch
            ORDER BY ft.created_at DESC
            LIMIT 50";
    $stmt = $pdo->prepare($sql);
    $stmt->execute($params);
    $threads = $stmt->fetchAll(PDO::FETCH_ASSOC) ?: [];
}

function compute_points(array $row, \PDO $pdo, array $pointsCfg): float {
    $uid = (int)$row['uid'];
    $threads = (int)($row['user_posts'] ?? 0);
    $answers = (int)($row['answers'] ?? 0);
    $eventCreated = (int)$pdo->query("SELECT COUNT(*) FROM events WHERE created_by = {$uid}")->fetchColumn();
    $eventParticipants = (float)$pdo->query("SELECT COUNT(*) FROM event_participants WHERE user_id = {$uid}")->fetchColumn();
    $invites = 0;
    return $threads * ($pointsCfg['forum_question'] ?? 0.5)
         + $answers * ($pointsCfg['forum_answer'] ?? 1.0)
         + $eventCreated * ($pointsCfg['event_create'] ?? 1.0)
         + $eventParticipants * ($pointsCfg['event_participation'] ?? 0.1)
         + $invites * ($pointsCfg['invite'] ?? 0.5);
}

function membership_level(float $points, array $levels): array {
    usort($levels, fn($a,$b) => ($b['min'] ?? 0) <=> ($a['min'] ?? 0));
    foreach ($levels as $lvl) {
        if ($points >= (float)($lvl['min'] ?? 0)) {
            return [
                'label' => $lvl['label'] ?? 'New Daddy',
                'icon' => $lvl['icon'] ?? '',
            ];
        }
    }
    $fallback = $levels ? $levels[count($levels)-1] : ['label' => 'New Daddy','icon' => ''];
    return ['label' => $fallback['label'], 'icon' => $fallback['icon'] ?? ''];
}
?>
<main class="section">
  <div class="container">
    <p class="eyebrow">Community</p>
    <h1>Forum</h1>
    <?php if ($error): ?>
      <div class="toast-bar" style="border-color:#f87171; color:#991b1b;"><?= htmlspecialchars($error, ENT_QUOTES) ?></div>
    <?php endif; ?>

    <div class="flex between center-y" style="margin:14px 0; gap:12px; flex-wrap:wrap;">
      <form method="get" class="flex gap-8" style="flex-wrap:wrap; align-items:flex-end;">
        <div class="stack gap-4">
          <label class="label" for="searchQ">Suche nach Stichwort</label>
          <input id="searchQ" name="q" class="input" value="<?= htmlspecialchars($search, ENT_QUOTES) ?>" placeholder="Schlagwort eingeben">
        </div>
        <button class="btn" type="submit">Suchen</button>
      </form>
      <?php if ($userId): ?>
        <button class="btn" type="button" data-modal-open="modalThread">Neue Frage</button>
      <?php else: ?>
        <a class="btn ghost" href="/login">Login für neue Frage</a>
      <?php endif; ?>
    </div>

    <div class="stack gap-8" style="margin-top:10px;">
      <?php foreach ($threads as $t): ?>
        <?php
          $pts = $pdo ? compute_points($t, $pdo, $pointsCfg) : 0.0;
          $lvl = membership_level($pts, $levelsCfg);
        ?>
        <article class="card" style="padding:14px;">
          <div class="event__body">
            <div class="event__meta" style="flex-wrap:wrap; gap:8px;">
              <span><?= htmlspecialchars($t['created_at'], ENT_QUOTES) ?></span>
              <span><?= htmlspecialchars($t['display_name'] ?: 'Mitglied', ENT_QUOTES) ?></span>
              <span><?= htmlspecialchars($lvl['icon'] ?? '', ENT_QUOTES) ?> <?= htmlspecialchars($lvl['label'] ?? '', ENT_QUOTES) ?> (<?= number_format($pts,1) ?> Punkte)</span>
              <span>Beiträge: <?= (int)$t['user_posts'] + (int)$t['answers'] ?></span>
              <span>Antworten: <?= (int)$t['answers'] ?></span>
            </div>
            <h3 style="margin:6px 0;"><a href="/community_thread?id=<?= (int)$t['id'] ?>"><?= htmlspecialchars($t['title'], ENT_QUOTES) ?></a></h3>
            <p class="muted small"><?= nl2br(htmlspecialchars(substr($t['body'], 0, 200), ENT_QUOTES)) ?><?= strlen($t['body']) > 200 ? '…' : '' ?></p>
          </div>
        </article>
      <?php endforeach; ?>
      <?php if (!$threads): ?>
        <p class="muted">Noch keine Fragen gestellt.</p>
      <?php endif; ?>
    </div>
  </div>
</main>

<?php if ($userId): ?>
<div class="modal" id="modalThread">
  <div class="panel">
    <div class="head flex between center-y">
      <h3 style="margin:0;">Neue Frage</h3>
      <button class="btn ghost" type="button" data-modal-close>✕</button>
    </div>
    <form method="post" class="stack gap-10" style="margin-top:12px;">
      <input type="hidden" name="action" value="thread_create">
      <div class="stack gap-6">
        <label class="label" for="fTitleModal">Frage/Titel</label>
        <input id="fTitleModal" name="title" class="input" required>
      </div>
      <div class="stack gap-6">
        <label class="label" for="fBodyModal">Text</label>
        <textarea id="fBodyModal" name="body" class="textarea" rows="4" required></textarea>
      </div>
      <div class="flex gap-12" style="flex-wrap:wrap;">
        <button class="btn ghost" type="button" data-modal-close>Abbrechen</button>
        <button class="btn" type="submit">Frage erstellen</button>
      </div>
    </form>
  </div>
</div>
<?php endif; ?>

<script>
  document.querySelectorAll('[data-modal-open]').forEach(btn => {
    btn.addEventListener('click', () => {
      const id = btn.getAttribute('data-modal-open');
      const modal = document.getElementById(id);
      if (modal) modal.classList.add('open');
    });
  });
  document.querySelectorAll('[data-modal-close]').forEach(btn => {
    btn.addEventListener('click', () => {
      const modal = btn.closest('.modal');
      if (modal) modal.classList.remove('open');
    });
  });
  document.querySelectorAll('.modal').forEach(modal => {
    modal.addEventListener('click', (e) => {
      if (e.target === modal) modal.classList.remove('open');
    });
  });
</script>