# Product Requirements Document (PRD) - Angular Clarity Boilerplate

## 1. Product Vision

To provide a robust, scalable, and feature-rich boilerplate that serves as a foundational template for building modern, enterprise-grade web applications using Angular and the VMware Clarity Design System. The vision is to accelerate the development lifecycle by offering a pre-configured, best-practice project structure.

## 2. Target Audience

The primary target audience consists of **Angular developers and development teams** who require a standardized, efficient, and consistent starting point for new projects. This includes:

* **Enterprise Development Teams:** Teams that need to maintain a consistent look and feel across multiple applications.
* **Independent Developers:** Individuals looking to quickly bootstrap new projects without spending significant time on initial setup and configuration.

## 3. User Stories (Developer Stories)

### User Story 1: Quick Project Initialization
- **As a developer, I want to clone the repository and run `npm install` and `ng serve` to get a live development server running, so that I can bypass manual setup and start building features immediately.**
- **Acceptance Criteria:**
    - Given I have Node.js and Angular CLI installed,
    - When I clone the repository, install dependencies, and run the start command,
    - Then the application compiles successfully and is accessible in my browser at `localhost:4200`.

### User Story 2: Add a New Feature
- **As a developer, I want to create a new lazy-loaded feature module with its own components and routing, so that I can add new sections to the application in a scalable way.**
- **Acceptance Criteria:**
    - Given the boilerplate is running,
    - When I use the Angular CLI to generate a new module and add it to the main routing configuration,
    - Then I can navigate to the new feature's route, and its components are rendered correctly.

### User Story 3: Utilize Shared Components
- **As a developer, I want to use a component from the `SharedModule` within a new feature module, so that I can reuse common UI elements and maintain consistency.**
- **Acceptance Criteria:**
    - Given I have a new feature module,
    - When I import the `SharedModule` into my feature module,
    - Then I can use the shared components (e.g., a custom card or loader) in my feature's templates without errors.

## 4. Functional Requirements

- **FR-001: Pre-configured Angular Environment:** A ready-to-use Angular CLI project with all necessary dependencies and build configurations.
- **FR-002: Clarity Design System Integration:** Full integration of Clarity UI components and styles, ready for immediate use.
- **FR-003: Scalable Architecture:** A modular structure featuring a `CoreModule` for singleton services and a `SharedModule` for reusable UI components, directives, and pipes.
- **FR-004: Responsive Layout:** A default application shell with a responsive header, navigation sidebar, and main content area.
- **FR-005: Routing:** A pre-configured routing module with examples of lazy-loaded feature modules.
- **FR-006: Theming:** Basic support for Clarity's light and dark themes.

## 5. Non-Functional Requirements

- **NFR-001: Performance:** The initial boilerplate should be lightweight, ensuring fast development server startup times and optimized production builds.
- **NFR-002: Usability (Developer Experience):** The codebase must be clean, well-commented, and logically organized to provide an excellent developer experience.
- **NFR-003: Maintainability:** The modular architecture must facilitate easy updates to dependencies and allow for the addition of new features without introducing breaking changes to the core structure.
- **NFR-004: Scalability:** The architecture is designed to support the growth of large, enterprise-scale applications.
- **NFR-005: Extensibility:** The boilerplate should be easy to customize and extend with additional libraries, modules, and configurations as per project-specific needs.

## 6. Out of Scope

The following features and functionalities are explicitly out of scope for the boilerplate:

-   **Backend Implementation:** This is a frontend-only boilerplate and does not include any backend code or database.
-   **Authentication/Authorization Logic:** While the architecture supports the implementation of security features, no pre-built authentication or authorization logic is included.
-   **State Management:** The boilerplate does not include a state management library (e.g., NgRx, Akita) by default, allowing developers to choose the best solution for their needs.
-   **Business Logic:** No specific business logic or application features are included beyond the basic structural components.
-   **CI/CD Pipelines:** While the project is ready for CI/CD, no pre-configured pipelines are included.

---

## PRD UPDATE - 2025-09-25 07:34:29

# Product Requirements Document (PRD) Update - 2025-09-25 08:05:00

## 1. Executive Summary Update
This update details the requirements for a simple calculator application built using the Angular Clarity Boilerplate. The application will perform basic arithmetic operations (addition, subtraction, multiplication, and division) with a clean and simple user interface.

## 5. Solution Overview Update
The calculator application will be a single-page application (SPA) built using Angular and the Clarity Design System. It will consist of a main `CalculatorComponent` that handles all user interactions and calculations. No backend is needed.  The existing base project's `SharedModule` will be leveraged for reusable components where applicable.

## 6. Functional Requirements Update
- FR-001: Perform addition, subtraction, multiplication, and division operations accurately.
- FR-002: Display results clearly and concisely in a dedicated display area.
- FR-003: Handle invalid input (e.g., division by zero) gracefully with appropriate error messages displayed on the screen.
- FR-004: Provide a 'Clear' button to reset the input and the displayed result.
- FR-005: Ensure the application is responsive across various devices (desktop, tablet, and mobile).

## 7. Non-Functional Requirements Update
- NFR-001: The application should be responsive and performant across various devices and screen sizes.
- NFR-002: The application should be easy to use and intuitive for any user.
- NFR-003: The application should follow accessibility guidelines (WCAG) to ensure inclusivity.
- NFR-004: The application should be thoroughly tested for accuracy and error handling.

## 8. Epic Stories Update

### Epic 1: Basic Calculator Functionality
**Epic Description:** Implement the core functionality of the calculator, including basic arithmetic operations and input handling.
**Business Value:** Provides the fundamental functionality of the calculator app.
**Acceptance Criteria:**  All basic arithmetic operations are implemented accurately, invalid inputs are handled gracefully, and results are displayed correctly.

**User Stories:**
- **US-001:** As a user, I want to perform addition, subtraction, multiplication, and division so that I can easily perform basic calculations.
  - **As a** user
  - **I want to** perform basic arithmetic operations (+, -, *, /)
  - **So that** I can easily solve simple math problems.
  - **Acceptance Criteria:**
    - [ ] Addition, subtraction, multiplication, and division operations produce correct results.
    - [ ] Operations with invalid input (e.g., division by zero) are handled gracefully and result in a clear error message.
  - **Story Points:** 5
  - **Priority:** High

- **US-002:** As a user, I want to see the results of my calculations clearly displayed so that I can easily understand the output.
  - **As a** user
  - **I want to** see the results of my calculations displayed clearly in a designated output area.
  - **So that** I can easily understand the answers.
  - **Acceptance Criteria:**
    - [ ] Calculation results are clearly visible in an output area.
  - **Story Points:** 3
  - **Priority:** High

- **US-003:** As a user, I want a clear button to reset the calculator so that I can start a new calculation.
  - **As a** user
  - **I want to** have a 'Clear' button to reset the input and output fields.
  - **So that** I can easily start a new calculation.
  - **Acceptance Criteria:**
    - [ ] Pressing the 'Clear' button resets the input and the output fields to their initial state.
  - **Story Points:** 2
  - **Priority:** Medium

- **US-004:** As a user, I want the application to be responsive on different devices so that I can use it conveniently on any screen size.
  - **As a** user
  - **I want to** use the application on various devices (desktop, tablet, and mobile).
  - **So that** I can use it conveniently on any screen size.
  - **Acceptance Criteria:**
    - [ ] The application layout and functionality are responsive across various screen sizes.
  - **Story Points:** 3
  - **Priority:** High

## 10. Technical Requirements Update
The application will leverage the existing Angular Clarity Boilerplate.  The CalculatorComponent will be a new component added to the application. No backend integration is required.

## 11. Success Metrics & KPIs Update
- **User Adoption:** Number of users who utilize the calculator application.
- **Calculation Accuracy:** Percentage of calculations performed correctly.
- **Error Rate:** Frequency of errors encountered by users.
- **User Satisfaction:** Feedback from users regarding the application's usability and functionality.

## 12. Risk Assessment Update
- **Risk:** Potential for errors in the calculation logic.
  - **Mitigation:** Thorough testing and code review.
- **Risk:** Unexpected user input causing application crashes.
  - **Mitigation:** Robust error handling and input validation.
- **Risk:** Difficulty in integration with the existing Angular Clarity Boilerplate.
  - **Mitigation:**  Following the Boilerplate's existing structure, modularity, and design.


---

## PRD UPDATE - 2025-09-25 07:34:40

# Product Requirements Document (PRD) Update - 2025-09-25 08:15:00

## 1. Executive Summary Update
This calculator app will be a simple, single-page application built using Angular and the Clarity Design System. It will perform basic arithmetic operations and provide a user-friendly interface.  The project leverages the existing Angular Clarity Boilerplate to streamline development.

## 2. Product Vision & Strategy Update
The product vision is to create a reliable and easy-to-use calculator app.  The success of this project will be measured by the accuracy of calculations, user satisfaction, and ease of use. We'll strive for a high user adoption rate and a low error rate.

## 3. Target Users & Personas Update
The target users are individuals who need a simple calculator for everyday tasks. This includes students, professionals, and anyone who requires quick and basic arithmetic operations.

## 9. User Interface Requirements Update
The UI will follow a standard calculator layout.  Numbers will be displayed in a clear, prominent display area.  Buttons will be logically grouped for intuitive usability.  Error messages, if any, will be shown clearly in the display area.  We will leverage Clarity design system components for style consistency with the base project.

## 10. Technical Requirements Update
The application will be built on top of the Angular Clarity Boilerplate. The core logic will reside in a new `CalculatorComponent`, which will handle user input, calculation, and result display.  This will minimize the development effort as it leverages the pre-existing structure, shared modules, and components.

## 13. Timeline & Milestones Update
This project will be completed in a shorter timeline of 6 days,  leveraging the existing Angular Clarity Boilerplate.

**Phase 1: Setup and Design (1 day)**
- Day 1: Set up the development environment, design the UI, and implement basic HTML and CSS styling using Clarity Design System components.

**Phase 2: Development and Testing (4 days)**
- Day 2-5: Develop core calculator functionality, implement basic arithmetic operations (+,-,*,/), handle invalid inputs, ensure responsive design.

**Phase 3: Deployment (1 day)**
- Day 6: Deploy the application.

**Milestones:**
- Milestone 1: Complete UI design (End of Day 1)
- Milestone 2: Core calculator functionality and basic testing (End of Day 4)
- Milestone 3: Application deployed (End of Day 6)




---

## PRD UPDATE - 2025-09-25 07:35:15

# Product Requirements Document (PRD) Update - 2025-09-25 08:05:00

## 1. Executive Summary Update
This update refines the PRD to reflect the user request for a simple calculator application. The application will be built using the existing Angular Clarity Boilerplate, leveraging its structure and components to minimize development time and effort.  The application will be a single-page application with client-side calculation logic. No backend is required.

## 2. Product Vision & Strategy Update
The vision is to deliver a simple, user-friendly, and accurate calculator application that integrates seamlessly with the existing Angular Clarity Boilerplate. The strategy will focus on leveraging existing components and minimizing code complexity.

## 5. Solution Overview Update
The solution involves creating a new Angular component (`CalculatorComponent`) which encompasses the UI (buttons, display) and the logic for handling calculations and error checking.  This component will interact with the existing Clarity Design System for consistency and minimal code implementation.

## 6. Functional Requirements Update
The existing functional requirements for the base project remain unchanged. The calculator application adds the following specific functional requirements:

- **FR-Calc-001:** Perform addition of two numbers.
  - **Acceptance Criteria:** The calculator should correctly display the sum of two valid numerical inputs.
  - **Priority:** High
- **FR-Calc-002:** Perform subtraction of two numbers.
  - **Acceptance Criteria:** The calculator should correctly display the difference of two valid numerical inputs.
  - **Priority:** High
- **FR-Calc-003:** Perform multiplication of two numbers.
  - **Acceptance Criteria:** The calculator should correctly display the product of two valid numerical inputs.
  - **Priority:** High
- **FR-Calc-004:** Perform division of two numbers.
  - **Acceptance Criteria:** The calculator should correctly display the quotient of two valid numerical inputs.  It should handle division by zero gracefully (e.g., display an appropriate error message).
  - **Priority:** High
- **FR-Calc-005:** Handle invalid input (non-numeric characters).
  - **Acceptance Criteria:** The calculator should display an appropriate error message for invalid input and prevent calculation errors.
  - **Priority:** Medium
- **FR-Calc-006:** Clear the display and internal state.
  - **Acceptance Criteria:** A clear button should reset the input display and the internal calculation state.
  - **Priority:** High
- **FR-Calc-007:** Display calculation results clearly.
  - **Acceptance Criteria:** The result of a calculation should be displayed prominently and clearly in the calculator's display.
  - **Priority:** High

## 7. Non-Functional Requirements Update
The existing non-functional requirements from the Angular Clarity Boilerplate remain applicable.

## 8. Epic Stories Update
### Epic 1: Calculator Functionality
**Epic Description:** Implement the core functionality of the calculator application, including basic arithmetic operations and error handling.
**Business Value:** Provides a simple and useful calculator application for users.
**Acceptance Criteria:** All functional requirements (FR-Calc-001 to FR-Calc-007) are met.

**User Stories:**
- **US-Calc-001:** As a user, I want to add two numbers so I can calculate their sum.
  - **Acceptance Criteria:** See FR-Calc-001
  - **Story Points:** 3
  - **Priority:** High
- **US-Calc-002:** As a user, I want to subtract two numbers so I can calculate their difference.
  - **Acceptance Criteria:** See FR-Calc-002
  - **Story Points:** 3
  - **Priority:** High
- **US-Calc-003:** As a user, I want to multiply two numbers so I can calculate their product.
  - **Acceptance Criteria:** See FR-Calc-003
  - **Story Points:** 3
  - **Priority:** High
- **US-Calc-004:** As a user, I want to divide two numbers so I can calculate their quotient.
  - **Acceptance Criteria:** See FR-Calc-004
  - **Story Points:** 5
  - **Priority:** High
- **US-Calc-005:** As a user, I want the calculator to handle invalid input gracefully so I don't encounter unexpected errors.
  - **Acceptance Criteria:** See FR-Calc-005
  - **Story Points:** 3
  - **Priority:** Medium
- **US-Calc-006:** As a user, I want to be able to clear the display and reset the calculator.
  - **Acceptance Criteria:** See FR-Calc-006
  - **Story Points:** 2
  - **Priority:** High
- **US-Calc-007:** As a user, I want the results to be clearly displayed so I can easily see them.
  - **Acceptance Criteria:** See FR-Calc-007
  - **Story Points:** 2
  - **Priority:** High

## 10. Technical Requirements Update
The calculator application will leverage the existing Angular Clarity Boilerplate's technical architecture.  The `CalculatorComponent` will be a new component added to the application, leveraging the existing `SharedModule` for reusable UI elements. No backend changes are required.

## 12. Risk Assessment Update
- **Risk:** Integration challenges with existing Angular Clarity Boilerplate.
  - **Mitigation:** Thorough testing and incremental development.
- **Risk:** Unexpected behavior due to framework updates or dependencies.
  - **Mitigation:** Use latest stable versions and rigorous testing.
- **Risk:** UI design inconsistencies with Clarity Design System.
  - **Mitigation:** Adherence to Clarity guidelines and review of UI designs.

## 13. Timeline & Milestones Update
- **Milestone 1 (Day 1):** Complete design and initial implementation of `CalculatorComponent`.
- **Milestone 2 (Day 2):** Implement core arithmetic operations (addition, subtraction, multiplication, division).
- **Milestone 3 (Day 3):** Implement error handling and input validation.
- **Milestone 4 (Day 4):** Thorough testing and bug fixes.
- **Milestone 5 (Day 5):** Deployment to staging environment.
- **Milestone 6 (Day 6):** Deployment to production environment.



---

## PRD UPDATE - 2025-09-25 07:35:24

# Product Requirements Document (PRD) Update - 2025-09-25 08:20:00

## 1. Executive Summary Update
This update incorporates the findings from the analysis, architecture, and technology stack documents to refine the PRD for the calculator application. The application will leverage the existing Angular Clarity Boilerplate and focus on a simple, user-friendly design.  No backend integration is required.

## 2. Product Vision & Strategy Update
The calculator application will be a simple, accurate, and user-friendly tool integrated seamlessly with the Angular Clarity Boilerplate.  The primary goal is to provide a functional calculator using existing boilerplate components for efficiency and consistency with the existing codebase.

## 3. Target Users & Personas Update
The primary target users are developers familiar with the Angular Clarity Boilerplate. Secondary users may include anyone needing a simple calculator within the application.

## 9. User Interface Requirements Update
The UI should be simple, intuitive, and adhere to the Clarity Design System. The calculator should have a clear display area, number buttons (0-9, decimal point), operator buttons (+, -, *, /), a clear button, and an equals button.  Consider a standard calculator layout for optimal usability. Error messages should be displayed clearly in the display area.  Wireframes will be included in a subsequent update.

## 10. Technical Requirements Update
- The application will leverage the existing Angular Clarity Boilerplate project structure, using its routing and module systems.
- A new `CalculatorComponent` will be created to handle the calculator's functionality.  It will be part of an existing feature module, or a new feature module if deemed necessary.
- The `SharedModule` will be utilized to ensure UI consistency with the existing application.
- No backend changes are needed. All calculations will be performed client-side within the `CalculatorComponent`.
- All necessary styling will utilize the Clarity Design System.

## 11. Success Metrics & KPIs Update
- **Accuracy:** 100% accuracy in performing basic arithmetic operations.
- **Usability:** High user satisfaction scores based on user testing.
- **Error Rate:** Low rate of errors due to invalid input or unexpected behavior.
- **Development Time:** Completion within the defined timeline.
- **Code Quality:** High code quality and maintainability.

## 14. Dependencies & Assumptions Update
- The Angular Clarity Boilerplate project is functional and ready for integration.
- The project uses the latest stable versions of all necessary dependencies.
- Developers are familiar with the Angular Clarity Boilerplate and its structure.

