# Requirements Document
Generated: Tuesday, September 16, 2025

## Functional Requirements (Developer-Facing)

### FR-001: Project Initialization
- **Description:** The system shall provide a developer-ready Angular project that can be set up with minimal effort.
- **Acceptance Criteria:**
    - A developer shall be able to clone the project from a Git repository.
    - A developer shall be able to install all required dependencies using a single `npm install` command.
    - A developer shall be able to start the local development server using the `ng serve` command.
    - The boilerplate shall compile without errors and be viewable in a web browser.
- **Priority:** High

### FR-002: Modular Architecture
- **Description:** The system shall be structured with a scalable and maintainable modular architecture.
- **Acceptance Criteria:**
    - The project shall include a `CoreModule` for providing singleton services and one-time imports.
    - The project shall include a `SharedModule` for reusable components, directives, and pipes.
    - The architecture shall support the creation of lazy-loaded `FeatureModules` to encapsulate business domain logic.
- **Priority:** High

### FR-003: Clarity Design System Integration
- **Description:** The system shall be fully integrated with the VMware Clarity Design System for UI components and styling.
- **Acceptance Criteria:**
    - All necessary Clarity npm packages shall be included as dependencies.
    - Clarity's global stylesheets and assets shall be correctly configured and loaded.
    - The boilerplate shall use Clarity components for its core layout (header, sidebar, etc.).
    - Developers shall be able to use any Clarity component within their feature modules.
- **Priority:** High

### FR-004: Responsive Application Layout
- **Description:** The system shall provide a default, responsive application layout.
- **Acceptance Criteria:**
    - The boilerplate shall include a main application shell with a header, a collapsible sidebar for navigation, and a main content area.
    - The layout shall adapt correctly to various screen sizes, including desktop, tablet, and mobile.
- **Priority:** High

### FR-005: Routing and Navigation
- **Description:** The system shall include a pre-configured routing system for navigating between different views.
- **Acceptance Criteria:**
    - The project shall have a main `AppRoutingModule`.
    - The boilerplate shall provide an example of a lazy-loaded feature route.
    - Navigation links in the sidebar shall correctly navigate to their corresponding routes.
- **Priority:** Medium

## Non-Functional Requirements

### NFR-001: Performance (Developer Experience)
- **Description:** The boilerplate should be optimized for a fast and efficient development workflow.
- **Acceptance Criteria:**
    - The initial `ng serve` compilation time shall be reasonably fast.
    - Live-reloading times during development shall be minimal.
    - The production build (`ng build --prod`) shall be optimized, with tree-shaking and minification enabled.
- **Priority:** Medium

### NFR-002: Usability (Developer Experience)
- **Description:** The codebase should be intuitive and easy for an Angular developer to understand and extend.
- **Acceptance Criteria:**
    - The project structure shall be logical and follow established Angular best practices.
    - The code shall be clean, well-formatted, and include comments for complex or non-obvious sections.
    - A comprehensive `README.txt` file shall guide developers on setup, architecture, and usage.
- **Priority:** High

### NFR-003: Maintainability
- **Description:** The codebase should be structured to allow for easy updates, modifications, and extensions.
- **Acceptance Criteria:**
    - The modular architecture shall allow for independent development and testing of features.
    - Dependencies shall be clearly defined in `package.json` and easy to update.
    - The separation of concerns between modules should be strictly enforced.
- **Priority:** High

## Data Requirements (Client-Side)

### Entity Modeling:
- **Description:** The boilerplate will not have predefined data models but will require developers to define them using TypeScript.
- **Attributes:**
    - Data models shall be defined as **TypeScript interfaces or classes**.
    - These models will represent the structure of data consumed from and sent to a backend API.

## Interface Requirements

### UI/UX Requirements (Frontend Boilerplate):
- **Layout:** A clean, professional single-page application layout based on the Clarity Design System.
- **Header:** A top header bar, typically containing the application title/logo and user-related actions (e.g., profile, logout).
- **Sidebar:** A collapsible vertical navigation sidebar containing links to different feature areas of the application.
- **Content Area:** A main content area where the components for the currently active route are displayed.
- **Styling:** Adherence to the styles and design tokens provided by the Clarity Design System.

### API Requirements (Backend Interaction):
- **Backend Agnostic:** The boilerplate is a frontend application and makes no assumptions about the backend technology stack.
- **Communication Protocol:** The boilerplate shall use Angular's `HttpClient` module to communicate with a backend over HTTP/HTTPS.
- **API Endpoint Configuration:** The base URL for the backend API shall be configurable via the `environments` files (e.g., `environment.ts`, `environment.prod.ts`).
- **Data Format:** The boilerplate is designed to work with APIs that transact data in **JSON** format.
- **Error Handling:** The architecture shall support a centralized way to handle API errors, typically through an `HttpInterceptor` provided in the `CoreModule`.

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## REQUIREMENTS UPDATE - 2025-09-25 06:56:51

## Requirements Document Update - 2025-09-25 07:00:00

This section updates the requirements document based on the user prompt and the revised project breakdown.

### FR-001: Perform Addition
- **Description:** The calculator shall correctly add two numbers.
- **Acceptance Criteria:** Given two valid numbers, the calculator shall return their sum.  The sum shall be displayed accurately.
- **Priority:** High

### FR-002: Perform Subtraction
- **Description:** The calculator shall correctly subtract two numbers.
- **Acceptance Criteria:** Given two valid numbers, the calculator shall return their difference. The difference shall be displayed accurately.
- **Priority:** High

### FR-003: Perform Multiplication
- **Description:** The calculator shall correctly multiply two numbers.
- **Acceptance Criteria:** Given two valid numbers, the calculator shall return their product. The product shall be displayed accurately.
- **Priority:** High

### FR-004: Perform Division
- **Description:** The calculator shall correctly divide two numbers.
- **Acceptance Criteria:** Given two valid numbers, the calculator shall return their quotient.  If the divisor is zero, the calculator shall display an appropriate error message ("Division by zero"). The quotient (or error message) shall be displayed accurately.
- **Priority:** High

### FR-005: Handle User Input
- **Description:** The calculator shall accept numerical input from the user via buttons.
- **Acceptance Criteria:** The calculator shall respond to button clicks correctly, updating the display appropriately.  Non-numeric input should be ignored.
- **Priority:** High

### FR-006: Display Results
- **Description:** The calculator shall display the results of calculations clearly to the user.
- **Acceptance Criteria:** The results of all calculations shall be displayed in a clear and easy-to-read format.
- **Priority:** High

### NFR-001: Usability
- **Description:** The calculator shall be intuitive and easy to use.
- **Acceptance Criteria:**  A user unfamiliar with the application should be able to use it effectively after minimal guidance.
- **Priority:** High

### NFR-002: Responsiveness
- **Description:** The calculator shall be responsive and work seamlessly across various devices and browsers.
- **Acceptance Criteria:**  The application shall adjust its layout and functionality to different screen sizes without loss of functionality.  Testing should be performed across various browsers and devices.
- **Priority:** High

### NFR-003: Performance
- **Description:** The calculator shall provide quick calculation results with minimal latency.
- **Acceptance Criteria:** Calculations shall be performed quickly and without noticeable delays.
- **Priority:** Medium



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## REQUIREMENTS UPDATE - 2025-09-25 06:56:58

## Requirements Document Update - 2025-09-25 07:07:00

This section provides an update to the requirements document based on the user prompt and the revised project breakdown.

### FR-007: Input Validation
- **Description:** The calculator shall validate user input to ensure that only valid numerical data is processed.
- **Acceptance Criteria:** The calculator shall reject non-numeric input and display an appropriate error message. It shall handle edge cases like large numbers and decimal inputs within reasonable limits defined by the system architecture. 
- **Priority:** High

### FR-008: Clear Error Handling
- **Description:** The application will provide clear and concise error messages to the user in case of invalid inputs or unexpected errors.
- **Acceptance Criteria:**  Error messages must be informative and easy to understand for the end-user, providing helpful guidance on how to resolve errors.
- **Priority:** High

### NFR-004: Accessibility
- **Description:** The calculator must adhere to accessibility standards to ensure usability for users with disabilities.
- **Acceptance Criteria:** The application's design must conform to WCAG guidelines to ensure inclusivity.
- **Priority:** Medium
