/**
 * EM2RP Cloud Functions
 * Architecture backend sécurisée avec authentification et permissions
 */

const { onRequest, onCall } = require("firebase-functions/v2/https");
const logger = require("firebase-functions/logger");
const admin = require('firebase-admin');
const { Storage } = require('@google-cloud/storage');

// Utilitaires
const auth = require('./utils/auth');
const helpers = require('./utils/helpers');

// Initialisation
admin.initializeApp();
const storage = new Storage();
const db = admin.firestore();

// Configuration commune pour toutes les fonctions HTTP
const httpOptions = {
  cors: true,
  invoker: 'public', // Permet les invocations non authentifiées (l'auth est gérée par notre token Firebase)
  // Version: 2.0 - Ajout de l'invoker public pour résoudre les problèmes CORS
};

// ============================================================================
// CORS Middleware
// ============================================================================
const setCorsHeaders = (res, req) => {
  // Permettre toutes les origines en développement/production
  const origin = req.headers.origin || req.headers.referer || '*';
  res.set('Access-Control-Allow-Origin', origin);
  res.set('Access-Control-Allow-Credentials', 'true');
  res.set('Access-Control-Allow-Methods', 'GET, POST, PUT, DELETE, OPTIONS');
  res.set('Access-Control-Allow-Headers', 'Authorization, Content-Type, Accept, Origin, X-Requested-With');
  res.set('Access-Control-Max-Age', '3600');
};

// Wrapper pour les fonctions avec CORS
const withCors = (handler) => {
  return async (req, res) => {
    // Définir les headers CORS pour toutes les requêtes
    setCorsHeaders(res, req);

    // Gérer les requêtes preflight OPTIONS
    if (req.method === 'OPTIONS') {
      res.status(204).send('');
      return;
    }

    // Exécuter le handler
    try {
      await handler(req, res);
    } catch (error) {
      logger.error("Unhandled error:", error);
      if (!res.headersSent) {
        res.status(500).json({ error: error.message });
      }
    }
  };
};

// ============================================================================
// STORAGE - Move Event File
// ============================================================================
exports.moveEventFileV2 = onRequest(httpOptions, withCors(async (req, res) => {
  try {
    const decodedToken = await auth.authenticateUser(req);
    const { sourcePath, destinationPath } = req.body.data || {};

    if (!sourcePath || !destinationPath) {
      res.status(400).json({ error: 'Source and destination paths are required.' });
      return;
    }

    const bucketName = admin.storage().bucket().name;
    const bucket = storage.bucket(bucketName);

    await bucket.file(sourcePath).copy(bucket.file(destinationPath));
    await bucket.file(sourcePath).delete();
    const [url] = await bucket.file(destinationPath).getSignedUrl({
      action: 'read',
      expires: '03-01-2500',
    });

    res.status(200).json({ url });
  } catch (error) {
    logger.error("Error moving file:", error);
    res.status(500).json({ error: error.message });
  }
}));

// ============================================================================
// EQUIPMENT - CRUD
// ============================================================================

// Créer un équipement (admin ou manage_equipment)
exports.createEquipment = onRequest(httpOptions, withCors(async (req, res) => {
  try {
    const decodedToken = await auth.authenticateUser(req);
    const hasAccess = await auth.hasPermission(decodedToken.uid, 'manage_equipment');

    if (!hasAccess) {
      res.status(403).json({ error: 'Forbidden: Requires manage_equipment permission' });
      return;
    }

    const equipmentData = req.body.data;
    const equipmentId = equipmentData.id;

    if (!equipmentId) {
      res.status(400).json({ error: 'Equipment ID is required' });
      return;
    }

    // Vérifier unicité de l'ID
    const existingDoc = await db.collection('equipments').doc(equipmentId).get();
    if (existingDoc.exists) {
      res.status(409).json({ error: 'Equipment ID already exists' });
      return;
    }

    // Convertir les timestamps
    const dataToSave = helpers.deserializeTimestamps(equipmentData, [
      'createdAt', 'updatedAt', 'purchaseDate', 'lastMaintenanceDate', 'nextMaintenanceDate'
    ]);

    await db.collection('equipments').doc(equipmentId).set(dataToSave);

    res.status(201).json({ id: equipmentId, message: 'Equipment created successfully' });
  } catch (error) {
    logger.error("Error creating equipment:", error);
    res.status(500).json({ error: error.message });
  }
}));

// Mettre à jour un équipement
exports.updateEquipment = onRequest(httpOptions, withCors(async (req, res) => {
  try {
    const decodedToken = await auth.authenticateUser(req);
    const hasAccess = await auth.hasPermission(decodedToken.uid, 'manage_equipment');

    if (!hasAccess) {
      res.status(403).json({ error: 'Forbidden: Requires manage_equipment permission' });
      return;
    }

    const { equipmentId, data } = req.body.data;

    if (!equipmentId) {
      res.status(400).json({ error: 'Equipment ID is required' });
      return;
    }

    // Empêcher la modification de l'ID
    delete data.id;

    // Ajouter updatedAt
    data.updatedAt = admin.firestore.Timestamp.now();

    const dataToSave = helpers.deserializeTimestamps(data, [
      'purchaseDate', 'lastMaintenanceDate', 'nextMaintenanceDate'
    ]);

    await db.collection('equipments').doc(equipmentId).update(dataToSave);

    res.status(200).json({ message: 'Equipment updated successfully' });
  } catch (error) {
    logger.error("Error updating equipment:", error);
    res.status(500).json({ error: error.message });
  }
}));

// Supprimer un équipement
exports.deleteEquipment = onRequest(httpOptions, withCors(async (req, res) => {
  try {
    const decodedToken = await auth.authenticateUser(req);
    const hasAccess = await auth.hasPermission(decodedToken.uid, 'manage_equipment');

    if (!hasAccess) {
      res.status(403).json({ error: 'Forbidden: Requires manage_equipment permission' });
      return;
    }

    const { equipmentId } = req.body.data;

    if (!equipmentId) {
      res.status(400).json({ error: 'Equipment ID is required' });
      return;
    }

    // Vérifier si l'équipement est utilisé dans des événements actifs
    const eventsSnapshot = await db.collection('events')
      .where('status', '!=', 'CANCELLED')
      .get();

    for (const eventDoc of eventsSnapshot.docs) {
      const eventData = eventDoc.data();
      const assignedEquipment = eventData.assignedEquipment || [];

      if (assignedEquipment.some(eq => eq.equipmentId === equipmentId)) {
        res.status(409).json({
          error: 'Cannot delete equipment: it is assigned to active events',
          eventId: eventDoc.id
        });
        return;
      }
    }

    await db.collection('equipments').doc(equipmentId).delete();

    res.status(200).json({ message: 'Equipment deleted successfully' });
  } catch (error) {
    logger.error("Error deleting equipment:", error);
    res.status(500).json({ error: error.message });
  }
}));

// Récupérer un équipement par ID
exports.getEquipment = onRequest(httpOptions, withCors(async (req, res) => {
  try {
    const decodedToken = await auth.authenticateUser(req);
    const hasViewAccess = await auth.hasPermission(decodedToken.uid, 'view_equipment');
    const hasManageAccess = await auth.hasPermission(decodedToken.uid, 'manage_equipment');

    if (!hasViewAccess && !hasManageAccess) {
      res.status(403).json({ error: 'Forbidden: Requires view_equipment permission' });
      return;
    }

    const { equipmentId } = req.body.data || req.query;

    if (!equipmentId) {
      res.status(400).json({ error: 'Equipment ID is required' });
      return;
    }

    const doc = await db.collection('equipments').doc(equipmentId).get();

    if (!doc.exists) {
      res.status(404).json({ error: 'Equipment not found' });
      return;
    }

    let data = { id: doc.id, ...doc.data() };
    data = helpers.serializeTimestamps(data);
    data = helpers.serializeReferences(data);

    // Masquer les prix si pas de permission manage_equipment
    data = helpers.maskSensitiveFields(data, hasManageAccess);

    res.status(200).json({ equipment: data });
  } catch (error) {
    logger.error("Error getting equipment:", error);
    res.status(500).json({ error: error.message });
  }
}));

// Récupérer plusieurs équipements par leurs IDs
exports.getEquipmentsByIds = onRequest(httpOptions, withCors(async (req, res) => {
  try {
    const decodedToken = await auth.authenticateUser(req);
    const hasViewAccess = await auth.hasPermission(decodedToken.uid, 'view_equipment');
    const hasManageAccess = await auth.hasPermission(decodedToken.uid, 'manage_equipment');

    if (!hasViewAccess && !hasManageAccess) {
      res.status(403).json({ error: 'Forbidden: Requires view_equipment permission' });
      return;
    }

    const { equipmentIds } = req.body.data || {};

    if (!equipmentIds || !Array.isArray(equipmentIds) || equipmentIds.length === 0) {
      res.status(400).json({ error: 'equipmentIds array is required and must not be empty' });
      return;
    }

    // Limiter à 100 équipements max par requête
    if (equipmentIds.length > 100) {
      res.status(400).json({ error: 'Maximum 100 equipment IDs per request' });
      return;
    }

    // Récupérer tous les documents en parallèle
    const promises = equipmentIds.map(id => db.collection('equipments').doc(id).get());
    const docs = await Promise.all(promises);

    const equipments = [];
    for (const doc of docs) {
      if (doc.exists) {
        let data = { id: doc.id, ...doc.data() };
        data = helpers.serializeTimestamps(data);
        data = helpers.serializeReferences(data);
        // Masquer les prix si pas de permission manage_equipment
        data = helpers.maskSensitiveFields(data, hasManageAccess);
        equipments.push(data);
      }
    }

    res.status(200).json({ equipments });
  } catch (error) {
    logger.error("Error getting equipments by IDs:", error);
    res.status(500).json({ error: error.message });
  }
}));

// ============================================================================
// CONTAINERS - CRUD
// ============================================================================

// Créer un container
exports.createContainer = onRequest(httpOptions, withCors(async (req, res) => {
  try {
    const decodedToken = await auth.authenticateUser(req);
    const hasAccess = await auth.hasPermission(decodedToken.uid, 'manage_equipment');

    if (!hasAccess) {
      res.status(403).json({ error: 'Forbidden: Requires manage_equipment permission' });
      return;
    }

    const containerData = req.body.data;
    const containerId = containerData.id;

    if (!containerId) {
      res.status(400).json({ error: 'Container ID is required' });
      return;
    }

    const existingDoc = await db.collection('containers').doc(containerId).get();
    if (existingDoc.exists) {
      res.status(409).json({ error: 'Container ID already exists' });
      return;
    }

    const dataToSave = helpers.deserializeTimestamps(containerData, ['createdAt', 'updatedAt']);

    await db.collection('containers').doc(containerId).set(dataToSave);

    res.status(201).json({ id: containerId, message: 'Container created successfully' });
  } catch (error) {
    logger.error("Error creating container:", error);
    res.status(500).json({ error: error.message });
  }
}));

// Mettre à jour un container
exports.updateContainer = onRequest(httpOptions, withCors(async (req, res) => {
  try {
    const decodedToken = await auth.authenticateUser(req);
    const hasAccess = await auth.hasPermission(decodedToken.uid, 'manage_equipment');

    if (!hasAccess) {
      res.status(403).json({ error: 'Forbidden: Requires manage_equipment permission' });
      return;
    }

    const { containerId, data } = req.body.data;

    if (!containerId) {
      res.status(400).json({ error: 'Container ID is required' });
      return;
    }

    delete data.id;
    data.updatedAt = admin.firestore.Timestamp.now();

    await db.collection('containers').doc(containerId).update(data);

    res.status(200).json({ message: 'Container updated successfully' });
  } catch (error) {
    logger.error("Error updating container:", error);
    res.status(500).json({ error: error.message });
  }
}));

// Supprimer un container
exports.deleteContainer = onRequest(httpOptions, withCors(async (req, res) => {
  try {
    const decodedToken = await auth.authenticateUser(req);
    const hasAccess = await auth.hasPermission(decodedToken.uid, 'manage_equipment');

    if (!hasAccess) {
      res.status(403).json({ error: 'Forbidden: Requires manage_equipment permission' });
      return;
    }

    const { containerId } = req.body.data;

    if (!containerId) {
      res.status(400).json({ error: 'Container ID is required' });
      return;
    }

    await db.collection('containers').doc(containerId).delete();

    res.status(200).json({ message: 'Container deleted successfully' });
  } catch (error) {
    logger.error("Error deleting container:", error);
    res.status(500).json({ error: error.message });
  }
}));

// Récupérer les containers contenant un équipement
exports.getContainersByEquipment = onRequest(httpOptions, withCors(async (req, res) => {
  try {
    const decodedToken = await auth.authenticateUser(req);
    const hasViewAccess = await auth.hasPermission(decodedToken.uid, 'view_equipment');
    const hasManageAccess = await auth.hasPermission(decodedToken.uid, 'manage_equipment');

    if (!hasViewAccess && !hasManageAccess) {
      res.status(403).json({ error: 'Forbidden: Requires view_equipment permission' });
      return;
    }

    const { equipmentId } = req.body.data || {};

    if (!equipmentId) {
      res.status(400).json({ error: 'equipmentId is required' });
      return;
    }

    const snapshot = await db.collection('containers')
      .where('equipmentIds', 'array-contains', equipmentId)
      .get();

    const containers = [];
    snapshot.forEach(doc => {
      let data = { id: doc.id, ...doc.data() };
      data = helpers.serializeTimestamps(data);
      data = helpers.serializeReferences(data);
      containers.push(data);
    });

    res.status(200).json({ containers });
  } catch (error) {
    logger.error("Error getting containers by equipment:", error);
    res.status(500).json({ error: error.message });
  }
}));

// Récupérer plusieurs containers par leurs IDs
exports.getContainersByIds = onRequest(httpOptions, withCors(async (req, res) => {
  try {
    const decodedToken = await auth.authenticateUser(req);
    const hasViewAccess = await auth.hasPermission(decodedToken.uid, 'view_equipment');
    const hasManageAccess = await auth.hasPermission(decodedToken.uid, 'manage_equipment');

    if (!hasViewAccess && !hasManageAccess) {
      res.status(403).json({ error: 'Forbidden: Requires view_equipment permission' });
      return;
    }

    const { containerIds } = req.body.data || {};

    if (!containerIds || !Array.isArray(containerIds) || containerIds.length === 0) {
      res.status(400).json({ error: 'containerIds array is required and must not be empty' });
      return;
    }

    // Limiter à 100 conteneurs max par requête
    if (containerIds.length > 100) {
      res.status(400).json({ error: 'Maximum 100 container IDs per request' });
      return;
    }

    // Récupérer tous les documents en parallèle
    const promises = containerIds.map(id => db.collection('containers').doc(id).get());
    const docs = await Promise.all(promises);

    const containers = [];
    for (const doc of docs) {
      if (doc.exists) {
        let data = { id: doc.id, ...doc.data() };
        data = helpers.serializeTimestamps(data);
        data = helpers.serializeReferences(data);
        containers.push(data);
      }
    }

    res.status(200).json({ containers });
  } catch (error) {
    logger.error("Error getting containers by IDs:", error);
    res.status(500).json({ error: error.message });
  }
}));


// ============================================================================
// EVENTS - CRUD
// ============================================================================

// Créer un événement
exports.createEvent = onRequest(httpOptions, withCors(async (req, res) => {
  try {
    const decodedToken = await auth.authenticateUser(req);
    const hasAccess = await auth.hasPermission(decodedToken.uid, 'edit_event');

    if (!hasAccess) {
      res.status(403).json({ error: 'Forbidden: Requires edit_event permission' });
      return;
    }

    const eventData = req.body.data;

    const dataToSave = helpers.deserializeTimestamps(eventData, [
      'startDateTime', 'endDateTime', 'createdAt', 'updatedAt'
    ]);

    const docRef = await db.collection('events').add(dataToSave);

    res.status(201).json({ id: docRef.id, message: 'Event created successfully' });
  } catch (error) {
    logger.error("Error creating event:", error);
    res.status(500).json({ error: error.message });
  }
}));

// Mettre à jour un événement
exports.updateEvent = onRequest(httpOptions, withCors(async (req, res) => {
  try {
    const decodedToken = await auth.authenticateUser(req);
    const hasAccess = await auth.hasPermission(decodedToken.uid, 'edit_event');

    if (!hasAccess) {
      res.status(403).json({ error: 'Forbidden: Requires edit_event permission' });
      return;
    }

    const requestData = req.body.data;
    const eventId = requestData.eventId;

    if (!eventId) {
      res.status(400).json({ error: 'Event ID is required' });
      return;
    }

    // Extraire eventId et préparer les données à sauvegarder
    const { eventId: _, ...data } = requestData;

    if (!data || Object.keys(data).length === 0) {
      res.status(400).json({ error: 'No data to update' });
      return;
    }

    delete data.id;
    data.updatedAt = admin.firestore.Timestamp.now();

    const dataToSave = helpers.deserializeTimestamps(data, [
      'startDateTime', 'endDateTime'
    ]);

    await db.collection('events').doc(eventId).update(dataToSave);

    res.status(200).json({ message: 'Event updated successfully' });
  } catch (error) {
    logger.error("Error updating event:", error);
    res.status(500).json({ error: error.message });
  }
}));

// Supprimer un événement
exports.deleteEvent = onRequest(httpOptions, withCors(async (req, res) => {
  try {
    const decodedToken = await auth.authenticateUser(req);
    const hasAccess = await auth.hasPermission(decodedToken.uid, 'delete_event');

    if (!hasAccess) {
      res.status(403).json({ error: 'Forbidden: Requires delete_event permission' });
      return;
    }

    const { eventId } = req.body.data;

    if (!eventId) {
      res.status(400).json({ error: 'Event ID is required' });
      return;
    }

    await db.collection('events').doc(eventId).delete();

    res.status(200).json({ message: 'Event deleted successfully' });
  } catch (error) {
    logger.error("Error deleting event:", error);
    res.status(500).json({ error: error.message });
  }
}));

// ============================================================================
// MAINTENANCES - CRUD
// ============================================================================

// Créer une maintenance
exports.createMaintenance = onRequest(httpOptions, withCors(async (req, res) => {
  try {
    const decodedToken = await auth.authenticateUser(req);
    const hasAccess = await auth.hasPermission(decodedToken.uid, 'manage_maintenances');

    if (!hasAccess) {
      res.status(403).json({ error: 'Forbidden: Requires manage_maintenances permission' });
      return;
    }

    const maintenanceData = req.body.data;

    const dataToSave = helpers.deserializeTimestamps(maintenanceData, [
      'scheduledDate', 'completedDate', 'createdAt', 'updatedAt'
    ]);

    const docRef = await db.collection('maintenances').add(dataToSave);

    res.status(201).json({ id: docRef.id, message: 'Maintenance created successfully' });
  } catch (error) {
    logger.error("Error creating maintenance:", error);
    res.status(500).json({ error: error.message });
  }
}));

// Mettre à jour une maintenance
exports.updateMaintenance = onRequest(httpOptions, withCors(async (req, res) => {
  try {
    const decodedToken = await auth.authenticateUser(req);
    const hasAccess = await auth.hasPermission(decodedToken.uid, 'manage_maintenances');

    if (!hasAccess) {
      res.status(403).json({ error: 'Forbidden: Requires manage_maintenances permission' });
      return;
    }

    const { maintenanceId, data } = req.body.data;

    if (!maintenanceId) {
      res.status(400).json({ error: 'Maintenance ID is required' });
      return;
    }

    delete data.id;
    data.updatedAt = admin.firestore.Timestamp.now();

    const dataToSave = helpers.deserializeTimestamps(data, [
      'scheduledDate', 'completedDate'
    ]);

    await db.collection('maintenances').doc(maintenanceId).update(dataToSave);

    res.status(200).json({ message: 'Maintenance updated successfully' });
  } catch (error) {
    logger.error("Error updating maintenance:", error);
    res.status(500).json({ error: error.message });
  }
}));

// ============================================================================
// OPTIONS - CRUD
// ============================================================================

// Créer une option
exports.createOption = onRequest(httpOptions, withCors(async (req, res) => {
  try {
    const decodedToken = await auth.authenticateUser(req);
    const isAdminUser = await auth.isAdmin(decodedToken.uid);

    if (!isAdminUser) {
      res.status(403).json({ error: 'Forbidden: Admin access required' });
      return;
    }

    const optionData = req.body.data;
    const optionId = optionData.id;

    if (!optionId) {
      res.status(400).json({ error: 'Option ID is required' });
      return;
    }

    await db.collection('options').doc(optionId).set(optionData);

    res.status(201).json({ id: optionId, message: 'Option created successfully' });
  } catch (error) {
    logger.error("Error creating option:", error);
    res.status(500).json({ error: error.message });
  }
}));

// Mettre à jour une option
exports.updateOption = onRequest(httpOptions, withCors(async (req, res) => {
  try {
    const decodedToken = await auth.authenticateUser(req);
    const isAdminUser = await auth.isAdmin(decodedToken.uid);

    if (!isAdminUser) {
      res.status(403).json({ error: 'Forbidden: Admin access required' });
      return;
    }

    const { optionId, data } = req.body.data;

    if (!optionId) {
      res.status(400).json({ error: 'Option ID is required' });
      return;
    }

    delete data.id;

    await db.collection('options').doc(optionId).update(data);

    res.status(200).json({ message: 'Option updated successfully' });
  } catch (error) {
    logger.error("Error updating option:", error);
    res.status(500).json({ error: error.message });
  }
}));

// Supprimer une option
exports.deleteOption = onRequest(httpOptions, withCors(async (req, res) => {
  try {
    const decodedToken = await auth.authenticateUser(req);
    const isAdminUser = await auth.isAdmin(decodedToken.uid);

    if (!isAdminUser) {
      res.status(403).json({ error: 'Forbidden: Admin access required' });
      return;
    }

    const { optionId } = req.body.data;

    if (!optionId) {
      res.status(400).json({ error: 'Option ID is required' });
      return;
    }

    await db.collection('options').doc(optionId).delete();

    res.status(200).json({ message: 'Option deleted successfully' });
  } catch (error) {
    logger.error("Error deleting option:", error);
    res.status(500).json({ error: error.message });
  }
}));

// ============================================================================
// USERS - CRUD
// ============================================================================

// Créer un utilisateur
exports.createUser = onRequest(httpOptions, withCors(async (req, res) => {
  try {
    const decodedToken = await auth.authenticateUser(req);
    const isAdminUser = await auth.isAdmin(decodedToken.uid);

    if (!isAdminUser) {
      res.status(403).json({ error: 'Forbidden: Admin access required' });
      return;
    }

    const userData = req.body.data;
    const userId = userData.uid;

    if (!userId) {
      res.status(400).json({ error: 'User ID is required' });
      return;
    }

    await db.collection('users').doc(userId).set(userData);

    res.status(201).json({ id: userId, message: 'User created successfully' });
  } catch (error) {
    logger.error("Error creating user:", error);
    res.status(500).json({ error: error.message });
  }
}));

// Mettre à jour un utilisateur
exports.updateUser = onRequest(httpOptions, withCors(async (req, res) => {
  try {
    const decodedToken = await auth.authenticateUser(req);
    const { userId, data } = req.body.data;

    if (!userId) {
      res.status(400).json({ error: 'User ID is required' });
      return;
    }

    // Vérifier si l'utilisateur met à jour son propre profil ou est admin
    const isOwnProfile = decodedToken.uid === userId;
    const isAdminUser = await auth.isAdmin(decodedToken.uid);
    const hasEditPermission = await auth.hasPermission(decodedToken.uid, 'edit_user');

    if (!isOwnProfile && !isAdminUser && !hasEditPermission) {
      res.status(403).json({ error: 'Forbidden: Cannot edit other users' });
      return;
    }

    // Si mise à jour propre profil, limiter les champs modifiables
    if (isOwnProfile && !isAdminUser) {
      const allowedFields = ['firstName', 'lastName', 'phoneNumber', 'profilePhotoUrl'];
      const filteredData = {};

      for (const field of allowedFields) {
        if (data[field] !== undefined) {
          filteredData[field] = data[field];
        }
      }

      await db.collection('users').doc(userId).update(filteredData);
    } else {
      delete data.uid;
      await db.collection('users').doc(userId).update(data);
    }

    res.status(200).json({ message: 'User updated successfully' });
  } catch (error) {
    logger.error("Error updating user:", error);
    res.status(500).json({ error: error.message });
  }
}));

// ============================================================================
// EQUIPMENT STATUS - Batch Update
// ============================================================================

// Mettre à jour le statut de plusieurs équipements (pour préparation/retour)
exports.updateEquipmentStatus = onRequest(httpOptions, withCors(async (req, res) => {
  try {
    const decodedToken = await auth.authenticateUser(req);
    const { eventId, updates } = req.body.data;

    if (!eventId || !updates || !Array.isArray(updates)) {
      res.status(400).json({ error: 'Event ID and updates array are required' });
      return;
    }

    // Vérifier que l'utilisateur est assigné à l'événement ou est admin
    const isAssigned = await auth.isAssignedToEvent(decodedToken.uid, eventId);
    const isAdminUser = await auth.isAdmin(decodedToken.uid);

    if (!isAssigned && !isAdminUser) {
      res.status(403).json({ error: 'Forbidden: Not assigned to this event' });
      return;
    }

    // Batch update
    const batch = db.batch();

    for (const update of updates) {
      const { equipmentId, status } = update;
      if (equipmentId && status) {
        const equipmentRef = db.collection('equipments').doc(equipmentId);
        batch.update(equipmentRef, { status });
      }
    }

    await batch.commit();

    res.status(200).json({ message: 'Equipment statuses updated successfully' });
  } catch (error) {
    logger.error("Error updating equipment statuses:", error);
    res.status(500).json({ error: error.message });
  }
}));

// ============================================================================
// OPTIONS - Read (public pour utilisateurs authentifiés)
// ============================================================================
exports.getOptions = onRequest(httpOptions, withCors(async (req, res) => {
  try {
    await auth.authenticateUser(req); // Juste vérifier l'auth

    const snapshot = await db.collection('options').get();
    const options = snapshot.docs.map(doc => ({
      id: doc.id,
      ...helpers.serializeTimestamps(doc.data())
    }));

    res.status(200).json({ options });
  } catch (error) {
    logger.error("Error fetching options:", error);
    res.status(500).json({ error: error.message });
  }
}));

// ============================================================================
// EVENT TYPES - Read (public pour utilisateurs authentifiés)
// ============================================================================
exports.getEventTypes = onRequest(httpOptions, withCors(async (req, res) => {
  try {
    await auth.authenticateUser(req); // Juste vérifier l'auth

    const snapshot = await db.collection('eventTypes').get();
    const eventTypes = snapshot.docs.map(doc => ({
      id: doc.id,
      ...helpers.serializeTimestamps(doc.data())
    }));

    res.status(200).json({ eventTypes });
  } catch (error) {
    logger.error("Error fetching event types:", error);
    res.status(500).json({ error: error.message });
  }
}));

// ============================================================================
// ROLES - Read (public pour utilisateurs authentifiés)
// ============================================================================
exports.getRoles = onRequest(httpOptions, withCors(async (req, res) => {
  try {
    await auth.authenticateUser(req); // Juste vérifier l'auth

    const snapshot = await db.collection('roles').get();
    const roles = snapshot.docs.map(doc => ({
      id: doc.id,
      ...helpers.serializeTimestamps(doc.data())
    }));

    res.status(200).json({ roles });
  } catch (error) {
    logger.error("Error fetching roles:", error);
    res.status(500).json({ error: error.message });
  }
}));

// ============================================================================
// EVENT EQUIPMENT - Update equipment status and quantities
// ============================================================================
exports.updateEventEquipment = onRequest(httpOptions, withCors(async (req, res) => {
  try {
    const decodedToken = await auth.authenticateUser(req);
    const { eventId, assignedEquipment, preparationStatus, loadingStatus, unloadingStatus, returnStatus } = req.body.data;

    if (!eventId) {
      res.status(400).json({ error: 'Event ID is required' });
      return;
    }

    // Vérifier les permissions
    const eventDoc = await db.collection('events').doc(eventId).get();
    if (!eventDoc.exists) {
      res.status(404).json({ error: 'Event not found' });
      return;
    }

    const eventData = eventDoc.data();
    const isAdminUser = await auth.hasPermission(decodedToken.uid, 'edit_event');
    const isAssigned = eventData.workforce?.some(ref => ref.path.endsWith(decodedToken.uid));

    if (!isAssigned && !isAdminUser) {
      res.status(403).json({ error: 'Forbidden: Not assigned to this event' });
      return;
    }

    // Préparer les données à mettre à jour
    const updateData = {};

    if (assignedEquipment) {
      // Convertir les timestamps dans assignedEquipment
      updateData.assignedEquipment = assignedEquipment.map(eq =>
        helpers.deserializeTimestamps(eq, [])
      );
    }

    if (preparationStatus) updateData.preparationStatus = preparationStatus;
    if (loadingStatus) updateData.loadingStatus = loadingStatus;
    if (unloadingStatus) updateData.unloadingStatus = unloadingStatus;
    if (returnStatus) updateData.returnStatus = returnStatus;

    // Mettre à jour l'événement
    await db.collection('events').doc(eventId).update(updateData);

    res.status(200).json({ message: 'Event equipment updated successfully' });
  } catch (error) {
    logger.error("Error updating event equipment:", error);
    res.status(500).json({ error: error.message });
  }
}));

// ============================================================================
// EQUIPMENT STATUS - Update individual equipment status
// ============================================================================
exports.updateEquipmentStatusOnly = onRequest(httpOptions, withCors(async (req, res) => {
  try {
    const decodedToken = await auth.authenticateUser(req);
    const { equipmentId, status, availableQuantity } = req.body.data;

    if (!equipmentId) {
      res.status(400).json({ error: 'Equipment ID is required' });
      return;
    }

    // Vérifier les permissions
    const hasAccess = await auth.hasPermission(decodedToken.uid, 'manage_equipment');
    if (!hasAccess) {
      res.status(403).json({ error: 'Forbidden: Requires manage_equipment permission' });
      return;
    }

    const updateData = { updatedAt: admin.firestore.Timestamp.now() };
    if (status) updateData.status = status;
    if (availableQuantity !== undefined) updateData.availableQuantity = availableQuantity;

    await db.collection('equipments').doc(equipmentId).update(updateData);

    res.status(200).json({ message: 'Equipment status updated successfully' });
  } catch (error) {
    logger.error("Error updating equipment status:", error);
    res.status(500).json({ error: error.message });
  }
}));

// ============================================================================
// EVENT TYPES - CRUD Operations
// ============================================================================

// Récupérer les événements utilisant un type d'événement
exports.getEventsByEventType = onRequest(httpOptions, withCors(async (req, res) => {
  try {
    await auth.authenticateUser(req);
    const { eventTypeId } = req.body.data;

    if (!eventTypeId) {
      res.status(400).json({ error: 'Event type ID is required' });
      return;
    }

    const eventsSnapshot = await db.collection('events')
      .where('eventTypeId', '==', eventTypeId)
      .get();

    const events = eventsSnapshot.docs.map(doc => ({
      id: doc.id,
      name: doc.data().name,
      startDateTime: doc.data().StartDateTime,
    }));

    res.status(200).json({ events });
  } catch (error) {
    logger.error("Error fetching events by type:", error);
    res.status(500).json({ error: error.message });
  }
}));

// Créer un type d'événement (admin uniquement)
exports.createEventType = onRequest(httpOptions, withCors(async (req, res) => {
  try {
    const decodedToken = await auth.authenticateUser(req);
    const isAdmin = await auth.hasPermission(decodedToken.uid, 'edit_data');

    if (!isAdmin) {
      res.status(403).json({ error: 'Forbidden: Admin permission required' });
      return;
    }

    const { name, defaultPrice } = req.body.data;

    if (!name || defaultPrice === undefined) {
      res.status(400).json({ error: 'Name and defaultPrice are required' });
      return;
    }

    // Vérifier l'unicité du nom
    const existingSnapshot = await db.collection('eventTypes')
      .where('name', '==', name)
      .get();

    if (!existingSnapshot.empty) {
      res.status(409).json({ error: 'Event type name already exists' });
      return;
    }

    const eventTypeData = {
      name,
      defaultPrice,
      createdAt: admin.firestore.Timestamp.now(),
    };

    const docRef = await db.collection('eventTypes').add(eventTypeData);

    res.status(201).json({ id: docRef.id, message: 'Event type created successfully' });
  } catch (error) {
    logger.error("Error creating event type:", error);
    res.status(500).json({ error: error.message });
  }
}));

// Mettre à jour un type d'événement (admin uniquement)
exports.updateEventType = onRequest(httpOptions, withCors(async (req, res) => {
  try {
    const decodedToken = await auth.authenticateUser(req);
    const isAdmin = await auth.hasPermission(decodedToken.uid, 'edit_data');

    if (!isAdmin) {
      res.status(403).json({ error: 'Forbidden: Admin permission required' });
      return;
    }

    const { eventTypeId, name, defaultPrice } = req.body.data;

    if (!eventTypeId) {
      res.status(400).json({ error: 'Event type ID is required' });
      return;
    }

    // Vérifier que le document existe
    const docRef = db.collection('eventTypes').doc(eventTypeId);
    const doc = await docRef.get();

    if (!doc.exists) {
      res.status(404).json({ error: 'Event type not found' });
      return;
    }

    // Vérifier l'unicité du nom (sauf pour le document actuel)
    if (name) {
      const existingSnapshot = await db.collection('eventTypes')
        .where('name', '==', name)
        .get();

      const hasDuplicate = existingSnapshot.docs.some(d => d.id !== eventTypeId);
      if (hasDuplicate) {
        res.status(409).json({ error: 'Event type name already exists' });
        return;
      }
    }

    const updateData = {};
    if (name) updateData.name = name;
    if (defaultPrice !== undefined) updateData.defaultPrice = defaultPrice;

    await docRef.update(updateData);

    res.status(200).json({ message: 'Event type updated successfully' });
  } catch (error) {
    logger.error("Error updating event type:", error);
    res.status(500).json({ error: error.message });
  }
}));

// Supprimer un type d'événement (admin uniquement)
exports.deleteEventType = onRequest(httpOptions, withCors(async (req, res) => {
  try {
    const decodedToken = await auth.authenticateUser(req);
    const isAdmin = await auth.hasPermission(decodedToken.uid, 'edit_data');

    if (!isAdmin) {
      res.status(403).json({ error: 'Forbidden: Admin permission required' });
      return;
    }

    const { eventTypeId } = req.body.data;

    if (!eventTypeId) {
      res.status(400).json({ error: 'Event type ID is required' });
      return;
    }

    // Vérifier qu'aucun événement futur n'utilise ce type
    const eventsSnapshot = await db.collection('events')
      .where('eventTypeId', '==', eventTypeId)
      .get();

    const now = admin.firestore.Timestamp.now();
    const futureEvents = eventsSnapshot.docs.filter(doc => {
      const startDate = doc.data().StartDateTime;
      return startDate && startDate > now;
    });

    if (futureEvents.length > 0) {
      res.status(409).json({
        error: 'Cannot delete event type with future events',
        futureEventsCount: futureEvents.length
      });
      return;
    }

    await db.collection('eventTypes').doc(eventTypeId).delete();

    res.status(200).json({ message: 'Event type deleted successfully' });
  } catch (error) {
    logger.error("Error deleting event type:", error);
    res.status(500).json({ error: error.message });
  }
}));

// ============================================================================
// EVENTS - Read with permissions
// ============================================================================
exports.getEvents = onRequest(httpOptions, withCors(async (req, res) => {
  try {
    const decodedToken = await auth.authenticateUser(req);
    const { userId } = req.body.data || {};

    // Vérifier si l'utilisateur peut voir tous les événements
    const canViewAll = await auth.hasPermission(decodedToken.uid, 'view_all_events');

    let eventsSnapshot;

    if (canViewAll) {
      // Admin : tous les événements
      eventsSnapshot = await db.collection('events').get();
    } else {
      // Utilisateur normal : seulement ses événements assignés
      const userRef = db.collection('users').doc(userId || decodedToken.uid);
      eventsSnapshot = await db.collection('events')
        .where('workforce', 'array-contains', userRef)
        .get();
    }

    // Collecter tous les UIDs utilisateurs uniques
    const userIdsSet = new Set();

    eventsSnapshot.docs.forEach(doc => {
      const data = doc.data();
      if (data.workforce && Array.isArray(data.workforce)) {
        data.workforce.forEach(userRef => {
          if (userRef && userRef.id) {
            userIdsSet.add(userRef.id);
          } else if (typeof userRef === 'string' && userRef.startsWith('users/')) {
            userIdsSet.add(userRef.split('/')[1]);
          }
        });
      }
    });

    // Récupérer tous les utilisateurs en une seule fois
    const usersMap = {};
    if (userIdsSet.size > 0) {
      const userIds = Array.from(userIdsSet);

      // Récupérer par batch (Firestore limite à 10 par requête 'in')
      const batchSize = 10;
      for (let i = 0; i < userIds.length; i += batchSize) {
        const batch = userIds.slice(i, i + batchSize);
        const usersSnapshot = await db.collection('users')
          .where(admin.firestore.FieldPath.documentId(), 'in', batch)
          .get();

        usersSnapshot.docs.forEach(userDoc => {
          const userData = userDoc.data();
          // Stocker uniquement les données publiques
          usersMap[userDoc.id] = {
            uid: userDoc.id,
            firstName: userData.firstName || '',
            lastName: userData.lastName || '',
            email: userData.email || '',
            phoneNumber: userData.phoneNumber || '',
            profilePhotoUrl: userData.profilePhotoUrl || '',
          };
        });
      }
    }

    // Sérialiser les événements avec workforce comme liste d'UIDs
    const events = eventsSnapshot.docs.map(doc => {
      const data = doc.data();

      // Convertir workforce en liste d'UIDs
      let workforceUids = [];
      if (data.workforce && Array.isArray(data.workforce)) {
        workforceUids = data.workforce.map(userRef => {
          if (userRef && userRef.id) {
            return userRef.id;
          } else if (typeof userRef === 'string' && userRef.startsWith('users/')) {
            return userRef.split('/')[1];
          }
          return null;
        }).filter(uid => uid !== null);
      }

      return {
        id: doc.id,
        ...helpers.serializeTimestamps(data),
        workforce: workforceUids, // Liste d'UIDs au lieu de DocumentReference
      };
    });

    // Retourner events + users map
    res.status(200).json({
      events,
      users: usersMap // Map UID -> données utilisateur
    });
  } catch (error) {
    logger.error("Error fetching events:", error);
    res.status(500).json({ error: error.message });
  }
}));

// ============================================================================
// EQUIPMENTS - Read with permissions
// ============================================================================
exports.getEquipments = onRequest(httpOptions, withCors(async (req, res) => {
  try {
    const decodedToken = await auth.authenticateUser(req);

    // Vérifier les permissions
    const canManage = await auth.hasPermission(decodedToken.uid, 'manage_equipment');
    const canView = await auth.hasPermission(decodedToken.uid, 'view_equipment');

    if (!canManage && !canView) {
      res.status(403).json({ error: 'Forbidden: Requires equipment permissions' });
      return;
    }

    const snapshot = await db.collection('equipments').get();
    const equipments = snapshot.docs.map(doc => {
      const data = doc.data();

      // Masquer les prix si l'utilisateur n'a pas manage_equipment
      if (!canManage) {
        delete data.purchasePrice;
        delete data.rentalPrice;
      }

      return {
        id: doc.id,
        ...helpers.serializeTimestamps(data, ['purchaseDate', 'nextMaintenanceDate', 'lastMaintenanceDate', 'createdAt', 'updatedAt'])
      };
    });

    res.status(200).json({ equipments });
  } catch (error) {
    logger.error("Error fetching equipments:", error);
    res.status(500).json({ error: error.message });
  }
}));

// ============================================================================
// CONTAINERS - Read with permissions
// ============================================================================
exports.getContainers = onRequest(httpOptions, withCors(async (req, res) => {
  try {
    const decodedToken = await auth.authenticateUser(req);

    // Vérifier les permissions
    const canView = await auth.hasPermission(decodedToken.uid, 'view_equipment');

    if (!canView) {
      res.status(403).json({ error: 'Forbidden: Requires equipment permissions' });
      return;
    }

    const snapshot = await db.collection('containers').get();
    const containers = snapshot.docs.map(doc => {
      const data = doc.data();
      return {
        id: doc.id,
        ...helpers.serializeTimestamps(data, ['createdAt', 'updatedAt'])
      };
    });

    res.status(200).json({ containers });
  } catch (error) {
    logger.error("Error fetching containers:", error);
    res.status(500).json({ error: error.message });
  }
}));

// ============================================================================
// MAINTENANCES - Read with permissions
// ============================================================================
exports.getMaintenances = onRequest(httpOptions, withCors(async (req, res) => {
  try {
    const decodedToken = await auth.authenticateUser(req);
    const { equipmentId } = req.body.data || {};

    // Vérifier les permissions
    const canView = await auth.hasPermission(decodedToken.uid, 'view_equipment');

    if (!canView) {
      res.status(403).json({ error: 'Forbidden: Requires equipment permissions' });
      return;
    }

    let query = db.collection('maintenances');

    // Filtrer par équipement si spécifié
    if (equipmentId) {
      query = query.where('equipmentIds', 'array-contains', equipmentId);
    }

    const snapshot = await query.get();
    const maintenances = snapshot.docs.map(doc => {
      const data = doc.data();
      return {
        id: doc.id,
        ...helpers.serializeTimestamps(data, ['scheduledDate', 'completedDate', 'createdAt', 'updatedAt'])
      };
    });

    res.status(200).json({ maintenances });
  } catch (error) {
    logger.error("Error fetching maintenances:", error);
    res.status(500).json({ error: error.message });
  }
}));

// ============================================================================
// ALERTS - Read with permissions
// ============================================================================
exports.getAlerts = onRequest(httpOptions, withCors(async (req, res) => {
  try {
    await auth.authenticateUser(req);

    const snapshot = await db.collection('alerts')
      .orderBy('createdAt', 'desc')
      .limit(100)
      .get();

    const alerts = snapshot.docs.map(doc => {
      const data = doc.data();
      return {
        id: doc.id,
        ...helpers.serializeTimestamps(data, ['createdAt'])
      };
    });

    res.status(200).json({ alerts });
  } catch (error) {
    logger.error("Error fetching alerts:", error);
    res.status(500).json({ error: error.message });
  }
}));

// ============================================================================
// USERS - Read with permissions
// ============================================================================
exports.getUsers = onRequest(httpOptions, withCors(async (req, res) => {
  try {
    const decodedToken = await auth.authenticateUser(req);

    // Vérifier les permissions
    const canViewAll = await auth.hasPermission(decodedToken.uid, 'view_all_users');

    if (!canViewAll) {
      // Si pas admin, ne retourner que l'utilisateur lui-même
      const userDoc = await db.collection('users').doc(decodedToken.uid).get();

      if (!userDoc.exists) {
        res.status(404).json({ error: 'User not found' });
        return;
      }

      let userData = userDoc.data();
      userData = helpers.serializeTimestamps(userData);
      userData = helpers.serializeReferences(userData);

      res.status(200).json({
        users: [{
          id: userDoc.id,
          ...userData
        }]
      });
      return;
    }

    // Admin : tous les utilisateurs
    const snapshot = await db.collection('users').get();
    const users = snapshot.docs.map(doc => {
      let data = doc.data();
      data = helpers.serializeTimestamps(data);
      data = helpers.serializeReferences(data);
      return {
        id: doc.id,
        ...data
      };
    });

    res.status(200).json({ users });
  } catch (error) {
    logger.error("Error fetching users:", error);
    res.status(500).json({ error: error.message });
  }
}));

// ============================================================================
// USER - Récupération individuelle
// ============================================================================


/**
 * Récupère un utilisateur spécifique par son ID
 * Tout utilisateur authentifié peut accéder aux données publiques
 */
exports.getUser = onCall(async (request) => {
  try {
    await authenticateUser(request);
    const db = getFirestore();

    const { userId } = request.data;
    if (!userId) {
      throw new Error("userId is required");
    }

    const userDoc = await db.collection("users").doc(userId).get();
    if (!userDoc.exists) {
      throw new Error("User not found");
    }

    const user = userDoc.data();

    // Données publiques accessibles à tous
    const userData = {
      id: userDoc.id,
      uid: user.uid || userDoc.id,
      email: user.email || "",
      firstName: user.firstName || "",
      lastName: user.lastName || "",
      phoneNumber: user.phoneNumber || "",
      profilePhotoUrl: user.profilePhotoUrl || "",
    };

    // Inclure le rôle si disponible
    if (user.role) {
      const roleDoc = await user.role.get();
      if (roleDoc.exists) {
        userData.role = {
          id: roleDoc.id,
          ...roleDoc.data(),
        };
      }
    }

    return { user: userData };
  } catch (error) {
    logger.error("Error fetching user:", error);
    throw new Error(error.message || "Failed to fetch user");
  }
});

// ============================================================================
// USER MANAGEMENT - Delete & Update
// ============================================================================

/**
 * Supprime un utilisateur (Auth + Firestore)
 * Permissions: 'delete_user' OU propriétaire
 */
exports.deleteUser = onCall(async (request) => {
  const { auth, data } = request;

  if (!auth) {
    throw new Error("Unauthorized: Authentication required");
  }

  const { userId } = data;
  if (!userId) {
    throw new Error("userId is required");
  }

  try {
    // Vérifier les permissions
    const callerDoc = await db.collection("users").doc(auth.uid).get();
    const callerData = callerDoc.data();

    if (!callerData) {
      throw new Error("Caller user not found");
    }

    // Vérifier si l'utilisateur a la permission delete_user
    let canDelete = false;
    if (callerData.role) {
      const roleDoc = await callerData.role.get();
      const roleData = roleDoc.data();
      canDelete = roleData?.permissions?.includes("delete_user") || false;
    }

    // Ou si c'est le propriétaire (mais on ne peut pas se supprimer soi-même)
    if (userId === auth.uid) {
      throw new Error("Cannot delete your own account");
    }

    if (!canDelete) {
      throw new Error("Unauthorized: Missing delete_user permission");
    }

    // Supprimer de Firebase Auth
    try {
      await admin.auth().deleteUser(userId);
    } catch (authError) {
      logger.warn(`Could not delete user from Auth: ${authError.message}`);
      // Continuer même si Auth échoue (l'utilisateur peut ne plus exister dans Auth)
    }

    // Supprimer de Firestore
    await db.collection("users").doc(userId).delete();

    logger.info(`User ${userId} deleted by ${auth.uid}`);
    return { success: true, message: "User deleted successfully" };
  } catch (error) {
    logger.error("Error deleting user:", error);
    throw new Error(error.message || "Failed to delete user");
  }
});

/**
 * Met à jour un utilisateur
 * Permissions: 'edit_user' OU propriétaire (modifications limitées)
 */
exports.updateUser = onCall(async (request) => {
  const { auth, data } = request;

  if (!auth) {
    throw new Error("Unauthorized: Authentication required");
  }

  const { userId, userData } = data;
  if (!userId || !userData) {
    throw new Error("userId and userData are required");
  }

  try {
    // Vérifier les permissions
    const callerDoc = await db.collection("users").doc(auth.uid).get();
    const callerData = callerDoc.data();

    if (!callerData) {
      throw new Error("Caller user not found");
    }

    let canEditAll = false;
    if (callerData.role) {
      const roleDoc = await callerData.role.get();
      const roleData = roleDoc.data();
      canEditAll = roleData?.permissions?.includes("edit_user") || false;
    }

    const isOwner = userId === auth.uid;

    // Si pas de permission edit_user et pas propriétaire, refuser
    if (!canEditAll && !isOwner) {
      throw new Error("Unauthorized: Missing edit_user permission");
    }

    // Préparer les données à mettre à jour
    const updateData = {
      firstName: userData.firstName,
      lastName: userData.lastName,
      email: userData.email,
      phoneNumber: userData.phoneNumber || "",
    };

    // Seuls ceux avec edit_user peuvent changer le rôle
    if (userData.role) {
      if (!canEditAll) {
        throw new Error("Unauthorized: Cannot change role without edit_user permission");
      }
      // Créer la référence au rôle
      updateData.role = db.collection("roles").doc(userData.role);
    }

    // Mettre à jour Firestore
    await db.collection("users").doc(userId).update(updateData);

    // Mettre à jour Firebase Auth si email a changé (seulement avec edit_user)
    if (userData.email && canEditAll) {
      try {
        await admin.auth().updateUser(userId, {
          email: userData.email,
        });
      } catch (authError) {
        logger.warn(`Could not update email in Auth: ${authError.message}`);
      }
    }

    logger.info(`User ${userId} updated by ${auth.uid}`);
    return { success: true, message: "User updated successfully" };
  } catch (error) {
    logger.error("Error updating user:", error);
    throw new Error(error.message || "Failed to update user");
  }
});