<?php
// /messages/api/list_conversations.php
declare(strict_types=1);

require_once __DIR__ . '/../_bootstrap.php';
header('Content-Type: application/json; charset=utf-8');

$role = $GLOBALS['MESSAGES_CTX']['role'] ?? '';
$meId = (int)($GLOBALS['MESSAGES_CTX']['me_id'] ?? 0);

// Sécurité: on ne gère ici que praticien/client
if (!in_array($role, ['praticien','client'], true)) {
    json_response(['items' => []]);
}
if ($meId <= 0) {
    json_response(['items' => []]);
}

// colonnes de visibilité/suppression selon le rôle
$hideCol = ($role === 'praticien') ? 'deleted_for_praticien' : 'deleted_for_client';
$archCol = ($role === 'praticien') ? 'archived_by_praticien' : 'archived_by_client'; // (pas utilisé ici, mais OK)

// Condition WHERE selon le rôle (évite :role répété => HY093)
$where = ($role === 'praticien')
    ? 'c.praticien_id = :me'
    : 'c.client_id = :me';

// Récupère les conversations qui me concernent (non supprimées pour moi)
$sql = "
SELECT
  c.id,
  c.praticien_id,
  c.client_id,
  c.status,
  cc.p_unread,
  cc.c_unread,
  -- dernier message (pour l’aperçu)
  (SELECT m.body FROM messages m
     WHERE m.conversation_id = c.id
       AND m.$hideCol = 0
     ORDER BY m.id DESC LIMIT 1) AS last_body,

  -- jointures pour noms
  p.nom   AS p_nom,   p.prenom  AS p_prenom,
  cl.nom  AS c_nom,   cl.prenom AS c_prenom

FROM conversations c
JOIN conversation_counters cc ON cc.conversation_id = c.id
JOIN praticien p ON p.id = c.praticien_id
JOIN client    cl ON cl.id = c.client_id

WHERE
  $where
  AND c.$hideCol = 0
ORDER BY c.id DESC
";

$stmt = $pdo->prepare($sql);
$stmt->execute([':me' => $meId]);

$items = [];
while ($row = $stmt->fetch(PDO::FETCH_ASSOC)) {
    $id = (int)$row['id'];

    // nom affiché = l’autre participant
    if ($role === 'praticien') {
        $peer = trim(($row['c_prenom'] ?? '').' '.($row['c_nom'] ?? ''));
    } else {
        $peer = trim(($row['p_prenom'] ?? '').' '.($row['p_nom'] ?? ''));
    }
    if ($peer === '') $peer = "Conversation #$id"; // fallback

    // compteur non lus côté moi
    $unread = ($role === 'praticien') ? (int)$row['p_unread'] : (int)$row['c_unread'];

    $items[] = [
        'id'        => $id,
        'peer_name' => $peer,
        'last_body' => (string)($row['last_body'] ?? ''),
        'unread'    => $unread,
        'status'    => (string)$row['status'],
    ];
}

json_response(['items' => $items]);