# io8 Business Analyst Agent - Customized for This Project

## Project-Specific Instructions

## Project Overview
Generated: 2025-09-26T09:44:40.087454

The primary objective of this project is to extend the existing Angular Clarity Boilerplate into a fully functional and user-friendly Weather Application. This involves integrating with external weather APIs, developing a backend proxy for secure data handling, and creating a responsive frontend UI using Angular and Clarity Design System to display current weather conditions and multi-day forecasts for user-specified locations.

## Business Analysis
Generated: 2025-09-26T09:44:40.087454

**Value Proposition:** The Weather App provides immediate and reliable access to local and global weather information, helping users plan their day and future activities. It serves as a practical demonstration of building a complete application using the Angular Clarity Boilerplate, showcasing full-stack integration and best practices.

**Target Audience:**
*   General users who need quick and accurate weather forecasts.
*   Angular developers looking for a robust example of integrating external APIs and building a user interface with Clarity Design System.

**Business Goals:**
*   Deliver a functional MVP capable of displaying current weather for a searched location.
*   Provide multi-day forecast capabilities.
*   Ensure a secure and efficient mechanism for fetching weather data via a backend proxy.
*   Maintain high usability and a consistent look-and-feel using the Clarity Design System.
*   Demonstrate containerization and deployment readiness for both frontend and backend services.

## User Requirements
Generated: 2025-09-26T09:44:40.087454

Based on the `io8codermaster_breakdown.md` and `io8codermaster_plan.md`, the core user requirements for the Weather App are:

1.  **Display Current Weather:** Users need to see the current weather conditions, including temperature, conditions description, humidity, and wind speed, for a selected location.
2.  **Search by Location:** Users must be able to search for weather by entering a city name.
3.  **Geolocation Search (Optional):** Users should have the option to use their current device location to fetch weather data.
4.  **Display Multi-Day Forecast:** Users require a view that shows a forecast for multiple upcoming days (e.g., 5-7 days).
5.  **Unit Conversion:** Users need to be able to switch between Celsius and Fahrenheit temperature units.
6.  **User-Friendly Interface:** The application interface should be intuitive, responsive, and aesthetically pleasing, consistent with the Clarity Design System.
7.  **Error Feedback:** Users should receive clear feedback when a location is not found or if there are issues fetching weather data.
8.  **Loading Indicators:** The system should provide visual cues while fetching data to inform the user that an operation is in progress.

## Functional Requirements
Generated: 2025-09-26T09:44:40.087454

1.  **External Weather API Integration:** The system shall integrate with a reliable third-party weather API.
2.  **Backend Proxy Service:** The system shall include a backend service to proxy requests to the external weather API, handling API key security and data transformation.
3.  **Current Weather Fetching:** The backend shall provide an endpoint to fetch current weather data for a given location.
4.  **Forecast Weather Fetching:** The backend shall provide an endpoint to fetch multi-day weather forecast data for a given location.
5.  **Location Search Input:** The frontend shall provide a search bar for users to input a city name.
6.  **Current Location Detection:** The frontend shall offer functionality to detect and use the user's current geolocation.
7.  **Weather Data Display:** The frontend shall display current weather information (temperature, conditions, humidity, wind speed).
8.  **Forecast Data Display:** The frontend shall display a list of daily forecasts, including high/low temperatures and weather icons.
9.  **Temperature Unit Toggle:** The frontend shall allow users to toggle between Celsius and Fahrenheit.
10. **Error Handling & Messaging:** The application shall gracefully handle API errors, network issues, and invalid location inputs, displaying informative messages to the user.
11. **Loading State Management:** The frontend shall show loading indicators during data fetching operations.
12. **Styling & Theming:** The application shall use the Clarity Design System for all UI components and ensure a consistent look and feel.

## Non-Functional Requirements
Generated: 2025-09-26T09:44:40.087454

1.  **Performance:**
    *   The application shall display current weather data within 3 seconds of a successful search query.
    *   Forecast data shall be displayed within 5 seconds of a successful forecast query.
    *   The backend proxy should introduce minimal latency (e.g., <100ms per request).
2.  **Security:**
    *   External weather API keys shall be stored securely on the backend (e.g., environment variables) and not exposed to the client-side.
    *   All communication between the frontend and backend shall use HTTPS.
3.  **Usability:**
    *   The user interface shall be intuitive and easy to navigate, adhering to Clarity Design System guidelines.
    *   The application shall be responsive and function correctly across various device sizes (desktop, tablet, mobile).
    *   Error messages shall be clear, concise, and actionable.
4.  **Reliability:**
    *   The backend proxy shall implement robust error handling for external API failures, returning appropriate status codes and messages to the frontend.
    *   The application shall remain functional even if a specific weather data point is missing from the API response (graceful degradation).
5.  **Scalability:**
    *   The backend service shall be designed to handle a moderate load of concurrent users (e.g., up to 100 concurrent requests) with potential for future scaling via caching or load balancing.
    *   The system architecture should allow for easy addition of new weather data providers or features.
6.  **Maintainability:**
    *   The codebase shall be well-documented, adhering to Angular and backend framework coding standards.
    *   Modules and components shall be logically structured and easily extensible.

## User Stories
Generated: 2025-09-26T09:44:40.087454

### US-001: View Current Weather for a Specific Location
*   **As a** user,
*   **I want to** search for a city by name and see its current weather conditions,
*   **So that I can** quickly get up-to-date weather information for any desired location.
*   **Acceptance Criteria:**
    *   The application displays a search bar.
    *   When I type a city name (e.g., "London") and submit, the application displays the current temperature, weather description (e.g., "Sunny"), humidity, and wind speed for London.
    *   If the city is not found, an appropriate message is displayed.

### US-002: View Multi-Day Weather Forecast
*   **As a** user,
*   **I want to** see a forecast for the upcoming days for my selected location,
*   **So that I can** plan my activities for the week ahead.
*   **Acceptance Criteria:**
    *   After searching for a location, the application displays a list of daily forecasts (e.g., for the next 5-7 days).
    *   Each forecast entry includes the day, date, high and low temperatures, and a weather icon/description.

### US-003: Switch Temperature Units
*   **As a** user,
*   **I want to** be able to switch between Celsius and Fahrenheit temperature units,
*   **So that I can** view weather data in my preferred measurement system.
*   **Acceptance Criteria:**
    *   The application provides a visible toggle or button to switch temperature units.
    *   When I click the toggle, all displayed temperatures (current and forecast) switch between Celsius and Fahrenheit.
    *   The selected unit persists during my session.

### US-004: Use Current Location for Weather
*   **As a** user,
*   **I want to** quickly see the weather for my current location,
*   **So that I can** get relevant information without typing.
*   **Acceptance Criteria:**
    *   The application provides an option (e.g., a button) to use my current location.
    *   Upon approval of browser's geolocation request, the application fetches and displays the current weather and forecast for my detected location.
    *   If geolocation fails or is denied, an informative message is displayed.

### US-005: Understand Data Fetching Status and Errors
*   **As a** user,
*   **I want to** receive clear feedback when data is loading or an error occurs,
*   **So that I can** understand the application's state and troubleshoot issues.
*   **Acceptance Criteria:**
    *   When the application is fetching weather data, a loading indicator is displayed.
    *   If a network error occurs or the external API is unreachable, an error message (e.g., "Could not fetch weather data. Please try again later.") is displayed.
    *   If an invalid search term is entered, a message like "Location not found." is displayed.

## Business Rules
Generated: 2025-09-26T09:44:40.087454

1.  **API Key Security:** All external weather API keys must be securely stored on the backend service and never exposed directly to the frontend.
2.  **API Rate Limits:** The backend proxy should implement strategies (e.g., caching, intelligent request throttling) to respect external weather API rate limits and optimize usage.
3.  **Data Caching:** To improve performance and reduce API calls, the backend service may implement a caching mechanism for frequently requested weather data.
4.  **Input Validation:** User input for location search must be validated on the frontend to prevent empty or malicious inputs.
5.  **Default Location:** Upon initial load, if no previous location is stored, the application may default to a predefined location or prompt the user for input.


## Functional Requirements
Generated: 2025-09-26T09:44:40.087454

### FR-001: Current Weather Display
-   **Description:** The application shall display the current weather conditions for a specified location.
-   **Acceptance Criteria:**
    -   The current temperature is shown.
    -   A brief weather description (e.g., "Clear Sky", "Partly Cloudy") is visible.
    -   Humidity percentage is displayed.
    -   Wind speed and direction (if available from API) are shown.
    -   A relevant weather icon is displayed.
-   **Priority:** High

### FR-002: Location Search by City Name
-   **Description:** Users shall be able to search for weather information by entering a city name in a search input field.
-   **Acceptance Criteria:**
    -   A prominent search bar component is available on the main page.
    -   Upon submission (e.g., by pressing Enter or clicking a search button), the application fetches and displays weather data for the entered city.
    -   The search is case-insensitive.
-   **Priority:** High

### FR-003: Location Search by Geolocation
-   **Description:** The application shall provide an option for users to retrieve weather information based on their current geographic location.
-   **Acceptance Criteria:**
    -   A button or toggle labeled "Use Current Location" (or similar) is present.
    -   Upon activation, the application requests access to the user's geolocation.
    -   If granted, weather data for the detected location is fetched and displayed.
    -   If denied or fails, a user-friendly error message is shown.
-   **Priority:** Medium

### FR-004: Multi-Day Weather Forecast Display
-   **Description:** The application shall present a multi-day forecast (e.g., 5-7 days) for the selected location.
-   **Acceptance Criteria:**
    -   A list or series of forecast cards/items is displayed, separate from current weather.
    -   Each forecast item includes the day of the week, date, a weather icon, a brief description, and the projected high and low temperatures.
-   **Priority:** High

### FR-005: Temperature Unit Conversion
-   **Description:** Users shall be able to toggle between Celsius and Fahrenheit temperature units for all displayed temperatures.
-   **Acceptance Criteria:**
    -   A clear control (e.g., toggle switch, radio buttons) is provided for unit selection.
    -   When a unit is selected, all temperature values on the screen (current and forecast) update accordingly.
    -   The selected unit is visually indicated.
-   **Priority:** High

### FR-006: Loading State Indicators
-   **Description:** The application shall provide visual feedback to the user when data is being fetched from the backend or external API.
-   **Acceptance Criteria:**
    -   A spinner or skeleton loader is displayed over relevant sections (e.g., weather card, forecast list) while data is loading.
    -   Loading indicators disappear once data is successfully displayed or an error occurs.
-   **Priority:** Medium

### FR-007: Robust Error Handling and Messaging
-   **Description:** The application shall gracefully handle and inform the user about errors, such as invalid location, API failures, or network issues.
-   **Acceptance Criteria:**
    -   If a searched location yields no results, a message like "Location not found. Please try again." is displayed.
    -   If the backend or external weather API is unreachable, a message like "Could not retrieve weather data. Please check your internet connection or try again later." is displayed.
    -   Error messages are prominent, clear, and easy to understand.
-   **Priority:** High

### FR-008: Backend API Endpoints
-   **Description:** The backend service shall expose API endpoints to serve weather data to the frontend.
-   **Acceptance Criteria:**
    -   `GET /api/current-weather?location={city}`: Returns current weather data for a given city.
    -   `GET /api/forecast?location={city}`: Returns multi-day forecast data for a given city.
    -   Responses are in a consistent JSON format suitable for frontend consumption.
-   **Priority:** High

## Non-Functional Requirements
Generated: 2025-09-26T09:44:40.087454

### NFR-001: Performance
-   **Description:** The application must provide a responsive user experience with quick data loading times.
-   **Acceptance Criteria:**
    -   Current weather display loads within 3 seconds for valid search queries over a standard broadband connection.
    -   Multi-day forecast display loads within 5 seconds for valid search queries over a standard broadband connection.
    -   Backend API response time (excluding external API call) should be consistently under 100ms.

### NFR-002: Security
-   **Description:** Sensitive information, particularly external API keys, must be handled securely.
-   **Acceptance Criteria:**
    -   External weather API keys are stored as environment variables on the backend server and are never hardcoded or exposed to the client-side.
    -   All communication between the frontend and backend, and backend to external API (if supported by external API), must utilize HTTPS/SSL.
    -   The backend proxy should sanitize and validate all inputs before forwarding to external APIs.

### NFR-003: Usability
-   **Description:** The user interface must be intuitive, easy to navigate, and consistent.
-   **Acceptance Criteria:**
    -   The application adheres to the Clarity Design System guidelines for all UI components, layout, and styling.
    -   The layout is fully responsive, adapting gracefully to screen sizes from mobile (e.g., 320px width) to large desktop monitors.
    -   Search functionality is easily discoverable and operable.
    -   Temperature unit toggle is clearly labeled and functional.

### NFR-004: Reliability
-   **Description:** The application must be robust and provide accurate information, even in the presence of external service issues.
-   **Acceptance Criteria:**
    -   The backend service implements retry mechanisms for transient external API failures.
    -   In case of persistent external API failure, the application displays an informative error message instead of crashing.
    -   Data displayed is consistent with the latest information from the external weather API.

### NFR-005: Scalability
-   **Description:** The system should be designed to handle an increasing number of users and data requests efficiently.
-   **Acceptance Criteria:**
    -   The backend service can be deployed in a horizontally scalable manner (e.g., containerized).
    -   Caching mechanisms (e.g., Redis) can be integrated into the backend service to reduce redundant external API calls and improve response times under load.

## Data Requirements
Generated: 2025-09-26T09:44:40.087454

### Entities and Attributes:

1.  **Location**
    *   `name`: City name (e.g., "London")
    *   `country`: Country code (e.g., "GB")
    *   `latitude`: Geographical latitude
    *   `longitude`: Geographical longitude

2.  **CurrentWeather**
    *   `location`: Reference to Location entity
    *   `temperature`: Current temperature (number, default Celsius)
    *   `unit`: Temperature unit (string, "Celsius" or "Fahrenheit")
    *   `condition`: Main weather condition (e.g., "Clouds", "Clear")
    *   `description`: Detailed weather description (e.g., "scattered clouds")
    *   `icon`: URL or code for weather icon
    *   `humidity`: Percentage of humidity
    *   `windSpeed`: Wind speed (number, default m/s)
    *   `timestamp`: Time of data observation

3.  **ForecastDay**
    *   `location`: Reference to Location entity
    *   `date`: Date of the forecast (e.g., "2025-10-01")
    *   `tempHigh`: Maximum temperature for the day
    *   `tempLow`: Minimum temperature for the day
    *   `unit`: Temperature unit (string, "Celsius" or "Fahrenheit")
    *   `condition`: Main weather condition for the day
    *   `description`: Detailed weather description
    *   `icon`: URL or code for weather icon

## Interface Requirements
Generated: 2025-09-26T09:44:40.087454

1.  **Clarity Design System Adherence:** The UI shall strictly follow the components, styling, and guidelines of the Clarity Design System for consistency and enterprise-grade aesthetics.
2.  **Responsive Layout:** The application layout must adapt gracefully to different screen sizes, from mobile phones to large desktop displays, without loss of functionality or significant visual degradation.
3.  **Search Bar:** A prominent search bar (Clarity Input Group or similar) should be located at the top of the main content area, allowing easy access for location input.
4.  **Weather Card:** The current weather details should be presented in a clear, concise card format (Clarity Card) with a distinct visual hierarchy.
5.  **Forecast List:** The multi-day forecast should be presented as a scrollable list or a series of cards, clearly separating each day's forecast.
6.  **Loading & Error States:** Clear visual indicators (Clarity Spinner, Alert components) must be used for loading states and error messages, ensuring user comprehension.
7.  **Unit Toggle:** A user-friendly toggle switch or segmented button (Clarity Toggle Switch or Button Group) should be implemented for switching temperature units (Celsius/Fahrenheit).

## Base Agent Prompt Reference

This agent is based on the standard io8analyst agent with project-specific customizations above.
Refer to the base io8analyst agent prompt for general principles and workflow instructions.
