<?php
// /messages/start.php
declare(strict_types=1);
require_once __DIR__ . '/_bootstrap.php';

$role  = $GLOBALS['MESSAGES_CTX']['role'];   // 'praticien' | 'client'
$meId  = (int)$GLOBALS['MESSAGES_CTX']['me_id'];

$pid = isset($_GET['praticien_id']) ? (int)$_GET['praticien_id'] : 0;
$cid = isset($_GET['client_id'])    ? (int)$_GET['client_id']    : 0;

// Déterminer l’interlocuteur selon mon rôle
if ($role === 'client' && $pid > 0) {
    $praticienId = $pid;
    $clientId    = $meId;
} elseif ($role === 'praticien' && $cid > 0) {
    $praticienId = $meId;
    $clientId    = $cid;
} else {
    http_response_code(400);
    echo "Bad params";
    exit;
}

// Chercher une conversation existante
$stmt = $pdo->prepare("SELECT * FROM conversations WHERE praticien_id = ? AND client_id = ? LIMIT 1");
$stmt->execute([$praticienId, $clientId]);
$conv = $stmt->fetch(PDO::FETCH_ASSOC);

if ($conv) {
    // Restaurer côté moi + rouvrir
    if ($role === 'client') {
        $pdo->prepare("
            UPDATE conversations
               SET deleted_for_client = 0,
                  deleted_for_praticien = 0,
                   archived_by_client = 0,
                   archived_by_praticien = 0,
                   status = 'open',
                   updated_at = NOW()
             WHERE id = ?
        ")->execute([(int)$conv['id']]);
    } else { // praticien
        $pdo->prepare("
            UPDATE conversations
               SET deleted_for_praticien = 0,
                    deleted_for_client = 0,
                   archived_by_praticien = 0,
                   archived_by_client = 0,
                   status = 'open',
                   updated_at = NOW()
             WHERE id = ?
        ")->execute([(int)$conv['id']]);
    }
    $convId = (int)$conv['id'];
} else {
    // Créer la conversation
    $pdo->beginTransaction();
    try {
        $pdo->prepare("
            INSERT INTO conversations
                (praticien_id, client_id, status,
                 archived_by_praticien, archived_by_client,
                 deleted_for_praticien, deleted_for_client,
                 created_at, updated_at)
            VALUES (?, ?, 'open', 0, 0, 0, 0, NOW(), NOW())
        ")->execute([$praticienId, $clientId]);

        $convId = (int)$pdo->lastInsertId();

        // counters optionnels
        if ($pdo->query("SHOW TABLES LIKE 'conversation_counters'")->rowCount()) {
            $pdo->prepare("INSERT INTO conversation_counters (conversation_id, p_unread, c_unread)
                           VALUES (?, 0, 0)")->execute([$convId]);
        }

        $pdo->commit();
    } catch (Throwable $e) {
        $pdo->rollBack();
        http_response_code(500);
        echo "Create failed";
        exit;
    }
}

// Redirection vers l’UI
header('Location: /messages/?conv=' . $convId);
exit;