# Sprint Plan - Messaging App Project

This sprint plan outlines the phased approach for the Messaging App project, aligning with the Product Requirements Document (PRD) and focusing on iterative development.

## Phase 1: Discovery & Architecture (Completed)
**Goal:** Establish foundational project understanding and technical blueprints.
**Deliverables:** `analysis_document.md`, `architecture_document.md`, `tech_stack_document.md`, `prd_document.md`.

## Phase 2: Core Messaging MVP Development (Target: 8-10 weeks)
**Goal:** Deliver a fully functional 1:1 messaging system with secure authentication and message persistence.

### Sprint 1: Foundational Services & Authentication (Weeks 1-3)
**Focus:** Backend user authentication, profile management, and initial frontend integration.
**Tasks:**
- **Task 1: Implement Backend User Authentication & Profile Management [BACKEND]**
  - Develop FastAPI services for user registration, login, profile CRUD, and user search.
  - Implement JWT issuance/validation, secure password hashing (bcrypt).
  - Define and implement initial PostgreSQL schema for Users.
  - Implement API rate limiting on auth/registration endpoints.
- **Task 2: Develop Frontend User Authentication & Profile Integration [FRONTEND]**
  - Integrate Angular Auth Module with Clarity UI for user registration/login.
  - Implement secure JWT handling (storage, refresh mechanism).
  - Develop basic User Profile view and update functionality.
  - Implement Content Security Policy (CSP) for the frontend.

### Sprint 2: Real-time 1:1 Messaging & Persistence (Weeks 4-7)
**Focus:** Core one-to-one real-time messaging functionality.
**Tasks:**
- **Task 3: Build Full-Stack One-to-One Real-time Messaging (MVP) [FULL-STACK]**
  - **Backend:** Develop Message Service (persistence in PostgreSQL), WebSocket Service (real-time delivery via FastAPI/Starlette).
  - **Backend:** Integrate Redis for Pub/Sub and user presence management.
  - **Backend:** Implement message buffering for offline users (Redis Streams/Lists).
  - **Frontend:** Develop Angular Chat Module (1:1 chat UI, message input, real-time sending/receiving messages).
  - **Frontend:** Implement display of paginated message history.
  - **Frontend:** Integrate user presence display in the UI.

### Sprint 3: MVP Integration, QA & Local Deployment (Weeks 8-10)
**Focus:** End-to-end integration, testing, and local development setup.
**Tasks:**
- Full end-to-end integration of frontend and backend components.
- Implement unit and integration tests (Jest/Pytest) for all MVP features.
- Conduct initial performance testing for message latency and concurrent users.
- Configure `docker-compose.yml` for consistent local development across all services (Frontend, Backend API, WebSocket, Redis, PostgreSQL).
- Set up basic monitoring for the local development environment.

## Phase 3: Feature Expansion & Quality Assurance (Target: 6-8 weeks, starting after MVP)
**Goal:** Implement advanced messaging features and ensure high quality.

### Sprint 4: Group Chat & UI Enhancements (Weeks 1-3)
**Focus:** Group chat capabilities.
**Tasks:**
- **Task 4: Implement Full-Stack Group Chat Capabilities [FULL-STACK]**
  - **Backend:** Extend Conversation Service for Group Chat management (creation, member add/remove).
  - **Backend:** Extend Message Service for group messaging.
  - **Frontend:** Develop UI for creating and managing group chats.
  - **Frontend:** Enhance conversation list to differentiate 1:1 and group chats.
  - **Frontend:** Develop an enhanced chat interface for group messaging.

### Sprint 5: Notifications & Media Sharing (Weeks 3-5)
**Focus:** Notifications and media sharing.
**Tasks:**
- **Task 5: Develop Full-Stack Enhanced Communication Features [FULL-STACK]**
  - **Backend:** Develop Notification Service.
  - **Backend:** Integrate with object storage (AWS S3/GCS) for File Storage Service.
  - **Backend:** Implement background task queue (Celery/Redis) for media processing.
  - **Frontend:** Implement in-app notification display.
  - **Frontend:** Implement functionality for uploading and displaying various media types within chat conversations.

### Sprint 6: Comprehensive Testing & Optimization (Weeks 5-8)
**Focus:** Quality assurance, performance, and security.
**Tasks:**
- Conduct full E2E testing (Cypress/Playwright) for all features.
- Perform security audits and advanced load testing.
- Comprehensive performance optimization across all features.
- Extensive bug fixing.
- Refine monitoring dashboards (Grafana) and logging queries (Loki/ELK).

## Phase 4: Deployment Readiness & Operations (Target: 2-3 weeks, after Feature Expansion)
**Goal:** Prepare for production deployment and establish operational excellence.

### Sprint 7: CI/CD & Production Infrastructure Setup (Weeks 1-2)
**Focus:** Automation and production environment configuration.
**Tasks:**
- Set up robust CI/CD pipelines (GitHub Actions/GitLab CI) for automated linting, testing, container image building, vulnerability scanning, and deployment to staging environments.
- Configure production-grade infrastructure on cloud (e.g., Kubernetes/ECS, PostgreSQL with read replicas, Redis Cluster, Nginx load balancer).
- Establish secure environment variable management.

### Sprint 8: Monitoring, Logging & Production Deployment (Weeks 2-3)
**Focus:** Operational readiness and final deployment.
**Tasks:**
- Implement comprehensive monitoring (Prometheus/Grafana), centralized logging (Loki/ELK), and error tracking (Sentry) for production.
- Configure alerts for critical issues.
- Automate database backups.
- Final deployment of the application to the production environment, followed by post-deployment verification and continuous operational support.
