# io8 System Architect Agent - Customized for This Project

## Project-Specific Instructions

```json
{
  "file_create": {
    "file_path": ".sureai/.io8architect_agent_to_do_list_to_do_list_20251016_135020.md",
    "content": "### io8Architect Agent Instructions for 'To Do List System App'\n\n**Project Context:**\nThe core project is an **Angular Clarity Boilerplate** as detailed in `analysis_document.md` and `requirements_document.md`. The user prompt is to transform this boilerplate into a functional **'To Do List System App'**. The architecture must build upon the existing frontend structure and integrate a new backend service for task persistence, ensuring a scalable and maintainable solution for an MVP with future extensibility.\n\n**Architecture Design Methodology:**\nOur approach will be incremental and iterative, building upon the established Angular Clarity boilerplate. We will apply a **Domain-Driven Design (DDD)** mindset to the 'Task' entity, ensuring clear separation of concerns between the frontend UI, business logic, and data persistence layers. The initial design will focus on delivering a Minimum Viable Product (MVP) for the To-Do List functionality, with considerations for future features like user authentication and advanced task management.\n\n**Technical Architecture Approach:**\n1.  **Client-Server Architecture:** The system will adopt a classic client-server model. The existing Angular Clarity application will serve as the Single-Page Application (SPA) frontend.\n2.  **RESTful API Backend:** A new, dedicated backend service will be developed to expose a RESTful API for managing To-Do List tasks. This backend will handle business logic and interact with a persistent database.\n3.  **Modular Frontend Extension:** The Angular application will be extended with a new lazy-loaded feature module (e.g., `TasksModule`) to encapsulate all To-Do List specific components, services, and routing, adhering to the existing boilerplate's modularity principles.\n4.  **Containerization:** Both the frontend (served via Nginx) and the backend API will be containerized using Docker for simplified development, deployment, and scalability.\n\n**System Design Framework:**\n*   **Frontend (Angular Clarity):** Adhere to the established Angular architecture with `CoreModule` for singletons (e.g., API services, error handlers), `SharedModule` for reusable UI components, and new `FeatureModules` for domain-specific logic (e.g., `TasksModule`). Components will utilize Clarity Design System for UI consistency.\n*   **Backend (Layered Architecture):** Implement a standard layered architecture:\n    *   **API Layer:** Handles HTTP requests, routing, input validation, and serialization/deserialization of data (e.g., using a Flask-RESTful resource).\n    *   **Service Layer:** Contains the core business logic for task management (e.g., create, read, update, delete, toggle status). Orchestrates interactions with the data layer.\n    *   **Data Access Layer (DAL):** Abstracts database interactions, providing methods for CRUD operations on the `Task` entity.\n*   **Data Persistence:** A relational database will be used to store task data, ensuring atomicity, consistency, isolation, and durability.\n\n**Technology Selection Strategy:**\n*   **Frontend:** Leverage the existing **Angular** framework and **VMware Clarity Design System** for rapid UI development and consistency. **RxJS** for reactive programming and state management within services.\n*   **Backend:** Choose a lightweight and modern language/framework suitable for building RESTful APIs rapidly. **Python with Flask** (or Node.js with Express) is recommended for its simplicity, robust ecosystem, and ease of containerization. This choice provides a good balance between development speed and performance for the MVP.\n*   **Database:** A robust, open-source relational database like **PostgreSQL** is preferred for its reliability, scalability, and rich feature set, suitable for task persistence. SQLite can be used for local development/testing convenience.\n*   **Infrastructure:** **Docker** will be the primary technology for containerizing both the frontend and backend applications, facilitating consistent deployment across environments. Nginx will serve the static Angular build within its container.\n\n**Customized io8architect Workflow for this Project:**\n1.  **Analyze and Validate Requirements:** Thoroughly review the `analysis_document.md` and `requirements_document.md` with the 'To Do List System App' context to ensure all functional and non-functional needs are captured and aligned with the boilerplate's capabilities.\n2.  **Define To-Do Domain Model:** Formally define the `Task` entity, its attributes (e.g., `id`, `title`, `description`, `status`, `createdAt`, `updatedAt`), and relationships.\n3.  **Backend API Design:** Design detailed RESTful endpoints for `Task` CRUD operations, including request/response payloads, HTTP methods, and status codes. Specify backend data validation rules.\n4.  **Database Schema Design:** Create the logical and physical database schema for the `tasks` table, including primary keys, data types, and constraints.\n5.  **Frontend Module & Component Design:** Plan the Angular `TasksModule`, outlining components for task listing, individual task view/edit, and task creation. Define how these components will interact with a new `TasksService` for API calls.\n6.  **Integration Design:** Detail the integration points between the Angular frontend and the backend API, including environment variable configuration for API endpoints and a centralized HTTP interceptor for error handling.\n7.  **Containerization Strategy:** Outline the Dockerfile specifications for both the Angular application (multi-stage build with Nginx) and the chosen backend service (e.g., Python Flask). Define a `docker-compose.yml` for local development orchestration.\n8.  **Security Considerations:** While MVP focuses on core functionality without authentication, document potential future security requirements (e.g., user authentication, API key protection).\n9.  **Scalability & Performance Review:** Assess potential bottlenecks and design for future scaling of both frontend (CDN, caching) and backend (horizontal scaling, database optimization).\n\n**Architecture and Tech Stack Instructions:**\n*   **Append** to `.sureai/architecture_document.md` with a new section detailing the system overview, architecture patterns, component design (frontend & backend), data architecture, API design, security considerations, and scalability specific to the 'To Do List System App'.\n*   **Append** to `.sureai/tech_stack_document.md` with selections for backend language/framework, primary database, and infrastructure components (Docker) necessary for the 'To Do List System App'.\n*   Ensure all additions are clearly marked with section headers and timestamps, maintaining the existing document structure.\n*   Explicitly reference the base project documents (`analysis_document.md`, `requirements_document.md`) when making design decisions."
  },
  "architecture": "\n# Architecture Document\nGenerated: 2025-10-16T14:01:50\n\n## System Overview - To Do List System App\nThe 'To Do List System App' is designed as a Single-Page Application (SPA) built upon the existing Angular Clarity Boilerplate. It will provide users with a clean, intuitive interface to manage their tasks. The frontend (Angular Clarity) will communicate with a dedicated RESTful API backend for all task-related operations, ensuring data persistence. The system aims for an MVP that supports essential task management functionalities (create, view, update, delete, toggle status) and is extensible for future enhancements like user authentication.\n\n## Architecture Pattern - Client-Server with SPA Frontend & RESTful API\nBuilding upon the boilerplate's frontend-centric design, the architecture adopts a robust Client-Server pattern:\n*   **Frontend (Client):** The Angular Clarity application acts as the client, responsible for rendering the UI, managing client-side state, and initiating requests to the backend API.\n*   **Backend (Server):** A new stateless API service will be introduced, handling business logic, data validation, and persistent storage of tasks. It exposes a RESTful interface to the frontend.\n*   **Database:** A dedicated relational database provides reliable persistence for task data.\n\nThis pattern aligns with the boilerplate's `HttpClient` integration for backend communication, offering a clear separation of concerns and enabling independent scaling of frontend and backend services.\n\n## Component Design - To Do List System App\n### Frontend (Angular Clarity)\nLeveraging the Angular Clarity Boilerplate's modular structure:\n*   **AppModule:** The root module, responsible for bootstrapping the application and configuring core routing.\n*   **CoreModule:** Will contain singleton services critical for the entire application, including:\n    *   `ApiService`: An abstraction layer for making HTTP requests to the backend, potentially with base URL configuration from `environments`.\n    *   `ErrorHandlerService` / `HttpInterceptor`: Centralized error handling for API responses, aligning with `requirements_document.md`'s API requirements.\n*   **SharedModule:** Will continue to host reusable UI components, directives, and pipes that are not specific to the 'To Do List' domain but can be used across features.\n*   **TasksModule (New Feature Module):** A lazy-loaded feature module encapsulating all To-Do List specific functionality:\n    *   `TasksListComponent`: Displays a list of all tasks, allowing for filtering and sorting.\n    *   `TaskDetailComponent`: Shows detailed information for a single task and allows for editing.\n    *   `TaskFormComponent`: A reusable form for creating new tasks or updating existing ones.\n    *   `TaskService`: Provides business logic for task management on the frontend, interacting with the `ApiService` to communicate with the backend.\n    *   `TasksRoutingModule`: Manages routing within the `TasksModule` (e.g., `/tasks`, `/tasks/:id`, `/tasks/new`).\n\n### Backend (API Service)\nDesigned with a layered approach for clarity and maintainability:\n*   **API Layer (Controllers/Resources):** Exposes RESTful endpoints. Responsible for parsing requests, invoking the Service Layer, and formatting responses.\n    *   `TaskController`: Handles all HTTP requests related to tasks (GET, POST, PUT, DELETE).\n*   **Service Layer (Business Logic):** Contains the core business rules for task operations. Ensures data integrity and implements complex logic if any.\n    *   `TaskService`: Implements CRUD operations, status toggling, and any other task-specific logic.\n*   **Data Access Layer (Repository/DAO):** Abstracts direct database interactions. Maps application entities to database records.\n    *   `TaskRepository`: Handles saving, retrieving, updating, and deleting tasks from the database.\n\n## Data Architecture - To Do List System App\n### Frontend Data Models\n*   **Task Interface:** A TypeScript interface (`ITask`) defining the structure of a task object as consumed by the Angular application, aligning with the JSON format expected by `requirements_document.md`.\n    ```typescript\n    export interface ITask {\n        id: string; // Unique identifier (e.g., UUID)\n        title: string;\n        description?: string; // Optional\n        status: 'pending' | 'completed';\n        createdAt: string; // ISO 8601 date string\n        updatedAt: string; // ISO 8601 date string\n    }\n    ```\n\n### Backend Data Persistence\n*   **Primary Database:** PostgreSQL will serve as the primary relational database for task storage.\n*   **Schema Design:** A `tasks` table will be created:\n    *   `id` (UUID, Primary Key)\n    *   `title` (VARCHAR(255), NOT NULL)\n    *   `description` (TEXT, NULLABLE)\n    *   `status` (VARCHAR(20), NOT NULL, CHECK (status IN ('pending', 'completed')))\n    *   `created_at` (TIMESTAMP WITH TIME ZONE, NOT NULL, DEFAULT CURRENT_TIMESTAMP)\n    *   `updated_at` (TIMESTAMP WITH TIME ZONE, NOT NULL, DEFAULT CURRENT_TIMESTAMP)\n\n## API Design - To Do List System App\nThe backend will expose a RESTful API for managing tasks, following standard HTTP methods and conventions. The base path for task-related endpoints will be `/api/tasks`. Data will be exchanged in JSON format as per `requirements_document.md`.\n\n*   **GET /api/tasks**\n    *   **Description:** Retrieve a list of all tasks.\n    *   **Response:** `200 OK` with an array of `ITask` objects.\n*   **GET /api/tasks/{id}**\n    *   **Description:** Retrieve a single task by its ID.\n    *   **Response:** `200 OK` with an `ITask` object, or `404 Not Found` if the task does not exist.\n*   **POST /api/tasks**\n    *   **Description:** Create a new task.\n    *   **Request Body:** `{\n        \"title\": \"string\",\n        \"description\": \"string\" (optional)\n    }`\n    *   **Response:** `201 Created` with the newly created `ITask` object, including its generated `id` and initial `status` ('pending').\n*   **PUT /api/tasks/{id}**\n    *   **Description:** Update an existing task by its ID.\n    *   **Request Body:** `{\n        \"title\": \"string\",\n        \"description\": \"string\",\n        \"status\": \"pending\" | \"completed\"\n    }` (all fields are required for a full update)\n    *   **Response:** `200 OK` with the updated `ITask` object, or `404 Not Found`.\n*   **PATCH /api/tasks/{id}/status**\n    *   **Description:** Toggle the completion status of a task.\n    *   **Request Body:** `{\n        \"status\": \"pending\" | \"completed\"\n    }`\n    *   **Response:** `200 OK` with the updated `ITask` object, or `404 Not Found`.\n*   **DELETE /api/tasks/{id}**\n    *   **Description:** Delete a task by its ID.\n    *   **Response:** `204 No Content` on successful deletion, or `404 Not Found`.\n\n## Security Architecture - To Do List System App (MVP)\nFor the MVP of the 'To Do List System App', explicit user authentication and authorization will **not** be implemented, as indicated by the simplified scope derived from the analysis. All API endpoints will be publicly accessible. This allows for rapid development of core functionality.\n\n### Future Considerations:\n*   **Authentication:** Implement user registration/login using JWT (JSON Web Tokens) or OAuth2 for securing API access.\n*   **Authorization:** Implement role-based access control (RBAC) to restrict task operations based on user permissions.\n*   **Input Validation:** Robust server-side validation for all API inputs to prevent common vulnerabilities like injection attacks.\n*   **HTTPS:** Enforce HTTPS for all communication between the frontend and backend to protect data in transit.\n\n## Scalability Considerations - To Do List System App\n### Frontend Scalability\n*   **Lazy Loading:** Angular's lazy-loaded modules (`TasksModule`) ensure that only necessary code is loaded for a given route, improving initial load times (`NFR-001`).\n*   **AOT Compilation & Tree-shaking:** The boilerplate already leverages Angular CLI's optimizations for smaller, faster production builds.\n*   **CDN:** Deploying static assets (Angular build) via a Content Delivery Network (CDN) can further improve global performance.\n\n### Backend Scalability\n*   **Stateless API:** The backend API will be designed to be stateless, allowing for horizontal scaling by running multiple instances behind a load balancer.\n*   **Database Connection Pooling:** Optimize database interactions by using connection pooling to efficiently manage database connections.\n*   **Caching (Future):** Introduce caching mechanisms (e.g., Redis) for frequently accessed, immutable data to reduce database load, if performance becomes an issue.\n\n### Infrastructure Scalability\n*   **Containerization (Docker):** Docker allows for easy replication and management of both frontend (Nginx) and backend service containers, facilitating scaling up or down as demand changes.\n*   **Orchestration (Kubernetes/ECS):** For larger deployments, container orchestration platforms like Kubernetes or AWS ECS can automate deployment, scaling, and management of the containerized services.\n\n",
  "tech_stack": "\n# Technology Stack Document\nGenerated: 2025-10-16T14:01:50\n\n## Frontend Technologies - To Do List System App\n-   **Framework:** Angular (v12+, as per boilerplate base)\n-   **Styling:** Clarity Design System (v8+, as per boilerplate base)\n-   **State Management:** Angular Services with RxJS Observables (for reactive data flow and shared state management; no external library needed for MVP).\n\n## Backend Technologies - To Do List System App\n-   **Language:** Python\n-   **Framework:** Flask (with Flask-RESTful for API development)\n-   **API:** REST (JSON-based)\n\n## Database Technologies - To Do List System App\n-   **Primary Database:** PostgreSQL (for production, robust and scalable)\n-   **Local Development Database:** SQLite (for simple, file-based local development and testing, if preferred for developer convenience).\n-   **ORM/Database Toolkit:** SQLAlchemy (Python ORM for interacting with PostgreSQL).\n\n## Infrastructure - To Do List System App\n-   **Deployment:** Docker (for containerization of both frontend and backend services)\n-   **Web Server (Frontend):** Nginx (to serve the static Angular application within a Docker container)\n-   **Hosting:** Cloud-agnostic (can be deployed on AWS, Azure, GCP, or on-premise using Docker/Kubernetes orchestration).\n\n## Development Tools - To Do List System App\n-   **Version Control:** Git\n-   **Frontend Testing:** Karma, Jasmine\n-   **Backend Testing:** Pytest\n-   **CI/CD:** (Placeholder - e.g., GitHub Actions, GitLab CI, Jenkins for automated build, test, and deployment pipelines)\n"
}
```

## Base Agent Prompt Reference

This agent is based on the standard io8architect agent with project-specific customizations above.
Refer to the base io8architect agent prompt for general principles and workflow instructions.
