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

header('Content-Type: application/json; charset=utf-8');

$role = $GLOBALS['MESSAGES_CTX']['role'];   // 'praticien' ou 'client'
$meId = $GLOBALS['MESSAGES_CTX']['me_id'];  // id praticien ou client

if (!hash_equals($_SESSION['_csrf'] ?? '', $_POST['_csrf'] ?? '')) {
    json_response(['error' => 'csrf'], 419);
}

$convId = (int)($_POST['conversation_id'] ?? 0);
$body   = isset($_POST['body']) ? trim((string)$_POST['body']) : '';

if ($convId <= 0) {
    json_response(['error' => 'bad_params'], 400);
}

// Autorisation + statut
$conv = assert_conversation_access($pdo, $convId, $role, $meId);
if (($conv['status'] ?? 'open') !== 'open') {
    json_response(['error' => 'closed'], 403);
}

// Upload (optionnel)
$attPath = null;
$attName = null;

if (!empty($_FILES['file']['name'] ?? '')) {
    $okExt = ['jpg','jpeg','png','pdf','doc','docx'];
    $name  = (string)$_FILES['file']['name'];
    $size  = (int)$_FILES['file']['size'];
    $tmp   = (string)$_FILES['file']['tmp_name'];

    $ext = strtolower(pathinfo($name, PATHINFO_EXTENSION));
    if (!in_array($ext, $okExt, true)) {
        json_response(['error' => 'invalid_file_type'], 400);
    }
    if ($size > 10 * 1024 * 1024) { // 10 Mo
        json_response(['error' => 'file_too_large'], 400);
    }

    $dir = realpath(__DIR__ . '/..') . '/uploads/';
    if (!is_dir($dir)) { @mkdir($dir, 0775, true); }
    $safe = $meId . '_' . time() . '_' . bin2hex(random_bytes(4)) . '.' . $ext;
    $dest = $dir . $safe;

    if (!move_uploaded_file($tmp, $dest)) {
        json_response(['error' => 'upload_failed'], 500);
    }

    // Chemin web relatif (sans leading slash pour constituer une URL /messages/uploads/..)
    $attPath = 'messages/uploads/' . $safe;
    $attName = $name;
}

// Flag : doit-on envoyer une notification mail ?
$shouldNotify = false;

try {
    $pdo->beginTransaction();

    // Insérer le message
    $ins = $pdo->prepare("
        INSERT INTO messages
            (conversation_id, sender_role, sender_id, body, attachment_path, attachment_name, created_at)
        VALUES
            (?, ?, ?, ?, ?, ?, NOW())
    ");
    $ins->execute([
        $convId,
        $role,
        $meId,
        $body !== '' ? $body : null,
        $attPath,
        $attName
    ]);
    $msgId = (int)$pdo->lastInsertId();

    // Mettre à jour les compteurs de non-lus (chez l'autre)
    if ($role === 'praticien') {
        // Le praticien écrit → c'est le client qui a des messages non lus (c_unread)
        $stmt = $pdo->prepare("
            SELECT c_unread
            FROM conversation_counters
            WHERE conversation_id = ?
            FOR UPDATE
        ");
        $stmt->execute([$convId]);
        $prev = $stmt->fetchColumn();
        $prevUnread = ($prev === false) ? 0 : (int)$prev;

        $pdo->prepare("
            UPDATE conversation_counters
               SET c_unread = c_unread + 1
             WHERE conversation_id = ?
        ")->execute([$convId]);

        if ($prevUnread === 0) {
            $shouldNotify = true;
        }

    } else {
        // Le client écrit → c'est le praticien qui a des messages non lus (p_unread)
        $stmt = $pdo->prepare("
            SELECT p_unread
            FROM conversation_counters
            WHERE conversation_id = ?
            FOR UPDATE
        ");
        $stmt->execute([$convId]);
        $prev = $stmt->fetchColumn();
        $prevUnread = ($prev === false) ? 0 : (int)$prev;

        $pdo->prepare("
            UPDATE conversation_counters
               SET p_unread = p_unread + 1
             WHERE conversation_id = ?
        ")->execute([$convId]);

        if ($prevUnread === 0) {
            $shouldNotify = true;
        }
    }

    // Bump updated_at
    $pdo->prepare("
        UPDATE conversations
           SET updated_at = NOW()
         WHERE id = ?
    ")->execute([$convId]);

    $pdo->commit();

} catch (Throwable $e) {
    if ($pdo->inTransaction()) { $pdo->rollBack(); }
    error_log('send_message error: '.$e->getMessage());
    json_response(['error' => 'server_error'], 500);
}

// 🔔 Notification par e-mail (ne doit jamais casser la réponse JSON)
if ($shouldNotify) {
    try {
        require_once __DIR__ . '/../../public/message_par_mail.php';
        notifier_nouveau_message_par_email($pdo, $convId, $role);
    } catch (Throwable $e) {
        error_log('Notif mail error: '.$e->getMessage());
    }
    try {
        // Déterminer le destinataire (l'autre)
        $targetRole = ($role === 'praticien') ? 'client' : 'praticien';

        // Normalement assert_conversation_access() te renvoie ces champs,
        // sinon fallback query (au cas où)
        $clientId    = (int)($conv['client_id'] ?? 0);
        $praticienId = (int)($conv['praticien_id'] ?? 0);

        if ($clientId <= 0 || $praticienId <= 0) {
            $st = $pdo->prepare("SELECT client_id, praticien_id FROM conversations WHERE id=? LIMIT 1");
            $st->execute([$convId]);
            $row = $st->fetch(PDO::FETCH_ASSOC) ?: [];
            $clientId    = (int)($row['client_id'] ?? 0);
            $praticienId = (int)($row['praticien_id'] ?? 0);
        }

        $targetRef = ($targetRole === 'client') ? $clientId : $praticienId;

        // ✅ Trouver le compte_id du destinataire (obligatoire pour worker + badge global)
            $stC = $pdo->prepare("
            SELECT id
            FROM compte
            WHERE role = :role AND reference_id = :ref
            LIMIT 1
            ");
            $stC->execute([
            ':role' => $targetRole,
            ':ref'  => $targetRef,
            ]);
            $targetCompteId = (int)($stC->fetchColumn() ?: 0);


        if ($targetRef > 0) {
            // Texte push (simple)
            $title = 'Новое сообщение c uslugi.fr';
            $text  = 'У вас новое сообщение с uslugi.fr.';
            if ($body !== '') {
                $snippet = mb_substr($body, 0, 120);
                $text = $snippet;
            }

            $url = ($targetRole === 'client')
                ? '/messages/?conv=' . $convId
                : '/messages/?conv=' . $convId;

            $data = json_encode([
                'message_id'      => $msgId,
                'sender_role'     => $role,
                'conversation_id' => $convId,
            ], JSON_UNESCAPED_UNICODE | JSON_UNESCAPED_SLASHES);

            if ($targetCompteId > 0) {
            $pdo->prepare("
                INSERT INTO push_badge_counters (compte_id, msg_unread, rdv_unread)
                VALUES (:cid, 1, 0)
                ON DUPLICATE KEY UPDATE
                msg_unread = LEAST(msg_unread + 1, 99),
                updated_at = NOW()
            ")->execute([':cid' => $targetCompteId]);
            }

            $insPush = $pdo->prepare("
            INSERT INTO push_notifications
                (target_role, target_reference_id, target_compte_id, type, title, body, url, data_json, status, attempts, created_at)
            VALUES
                (:role, :ref, :cid, 'message_new', :title, :body, :url, :data, 'pending', 0, NOW())
            ");
            $insPush->execute([
            ':role'  => $targetRole,
            ':ref'   => $targetRef,
            ':cid'   => ($targetCompteId > 0 ? $targetCompteId : null),
            ':title' => $title,
            ':body'  => $text,
            ':url'   => $url,
            ':data'  => $data,
            ]);

        }

    } catch (Throwable $e) {
        error_log('Notif push error: ' . $e->getMessage());
    }
}

json_response(['ok' => true, 'message_id' => $msgId]);