Initial commit

backend-node/services/groups.service.js

@@ -0,0 +1,76 @@
+const { ValidationError } = require('../shared/errors');
+
+class GroupsService {
+  constructor({ groupsRepository, usersRepository }) {
+    this.groupsRepository = groupsRepository;
+    this.usersRepository = usersRepository;
+  }
+
+  async getAllGroups() {
+    return await this.groupsRepository.findAll({
+      include: [
+        {
+          model: this.usersRepository.User,
+          as: 'members',
+          through: { attributes: [] },
+        },
+      ],
+    });
+  }
+
+  async getGroupById(groupId) {
+    return await this.groupsRepository.findById(groupId, true);
+  }
+
+  async createGroup(groupData) {
+    const { name, members } = groupData;
+
+    if (!name || name.trim() === '') {
+      throw new ValidationError('Group name is required');
+    }
+
+    if (!members || !Array.isArray(members) || members.length === 0) {
+      throw new ValidationError('At least one member is required');
+    }
+
+    for (const userId of members) {
+      await this.usersRepository.findById(userId);
+    }
+
+    const group = await this.groupsRepository.create({ name });
+    return await this.groupsRepository.addMembers(group.id, members);
+  }
+
+  async updateGroup(groupId, updateData) {
+    const { name } = updateData;
+
+    if (name && name.trim() === '') {
+      throw new ValidationError('Group name cannot be empty');
+    }
+
+    return await this.groupsRepository.update(groupId, { name });
+  }
+
+  async deleteGroup(groupId) {
+    return await this.groupsRepository.delete(groupId);
+  }
+
+  async addMembersToGroup(groupId, userIds) {
+    if (!userIds || !Array.isArray(userIds) || userIds.length === 0) {
+      throw new ValidationError('User IDs are required');
+    }
+
+    for (const userId of userIds) {
+      await this.usersRepository.findById(userId);
+    }
+
+    return await this.groupsRepository.addMembers(groupId, userIds);
+  }
+
+  async removeMemberFromGroup(groupId, userId) {
+    await this.usersRepository.findById(userId);
+    return await this.groupsRepository.removeMember(groupId, userId);
+  }
+}
+
+module.exports = GroupsService;