# Product Requirements Document (PRD)
## Todo Task Demo Application

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## 1. Overview

The Todo Task Demo Application is a single-page web application that allows users to submit their name and email through a simple form. Upon submission, the application displays all submitted entries in a list below the form, providing immediate visual feedback. This application serves as a minimal demonstration of form handling and data display without requiring backend infrastructure or user authentication.

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## 2. User Roles

### Anonymous User
- **Permissions:**
  - Fill out and submit the form with name and email
  - View all submitted entries in the list
  - Access the application without authentication
  - Refresh or revisit the page (note: data persists only in session/memory)

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## 3. Core Entities

### Submission
A data object representing a single form submission.

**Attributes:**
- `id` (string/number) — Unique identifier for the submission
- `name` (string) — The name entered by the user
- `email` (string) — The email address entered by the user
- `timestamp` (datetime) — The date and time when the submission was created
- `order` (number) — Sequential order of submission for display purposes

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## 4. Entity Relationships

### Submission Entity Relationships

- **Submission** is a standalone entity with no relationships to other entities
- Each submission exists independently in a flat list structure
- No hierarchical or associative relationships exist in this minimal application
- Submissions are stored in-memory (client-side) in chronological order

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## 5. Key Workflows

### Workflow 1: Form Submission

1. User navigates to the application URL
2. User sees an empty form with Name and Email input fields
3. User enters their name in the Name input field
4. User enters their email in the Email input field
5. User clicks the Submit button
6. System validates the input fields (see Business Rules)
7. If validation passes:
   - System creates a new Submission entity with unique ID and timestamp
   - System adds the Submission to the in-memory list
   - System clears the form inputs
   - System displays success feedback (optional)
8. If validation fails:
   - System displays error messages near relevant fields
   - Form retains entered data
   - User corrects errors and resubmits
9. System updates the submission list display to show the new entry

### Workflow 2: Viewing Submissions

1. User views the page (before or after submitting)
2. System displays all submissions in a list below the form
3. Each list item shows:
   - Name of the submitter
   - Email of the submitter
   - Optional: Timestamp or order number
4. Most recent submissions appear at the top (or bottom, per design decision)
5. Empty state shown if no submissions exist yet

### Workflow 3: Page Refresh

1. User refreshes the browser or closes and reopens the page
2. System loses all in-memory submission data
3. User sees empty form and empty submission list
4. Application returns to initial state

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## 6. Features & Requirements

### 6.1 Form Module

#### FR-1.1: Name Input Field
- Display a text input field labeled "Name"
- Accept alphanumeric and common name characters
- Provide placeholder text (e.g., "Enter your name")
- Visually indicate required field status

#### FR-1.2: Email Input Field
- Display an email input field labeled "Email"
- Use HTML5 email input type for basic browser validation
- Provide placeholder text (e.g., "Enter your email")
- Visually indicate required field status

#### FR-1.3: Submit Button
- Display a clearly labeled "Submit" button
- Enable button only when form is not in submission state
- Provide visual feedback on hover/focus
- Trigger form submission on click

#### FR-1.4: Form Validation Feedback
- Display inline error messages for invalid fields
- Show error state styling on invalid fields
- Clear error messages when user corrects input
- Prevent form submission when validation fails

#### FR-1.5: Form Reset
- Clear all input fields after successful submission
- Return focus to the first input field (optional UX enhancement)
- Remove any error states after submission

### 6.2 Submission List Module

#### FR-2.1: List Display
- Display all submissions in a vertical list format
- Show each submission as a distinct list item
- Render list below the form on the same page
- Auto-update list immediately after new submission

#### FR-2.2: Submission Item Display
- Display name clearly for each submission
- Display email clearly for each submission
- Optionally display submission timestamp or counter
- Use consistent formatting for all list items

#### FR-2.3: Empty State
- Display a friendly empty state message when no submissions exist
- Message example: "No submissions yet. Be the first to submit!"
- Remove empty state when first submission is added

#### FR-2.4: List Ordering
- Display submissions in reverse chronological order (newest first) OR chronological order (oldest first)
- Maintain consistent ordering throughout the session
- Preserve order as new submissions are added

### 6.3 UI/UX Module

#### FR-3.1: Single Page Layout
- Display form and submission list on a single page
- No navigation, routing, or multiple pages
- Keep all functionality visible without scrolling (if possible)

#### FR-3.2: Minimal Styling
- Use clean, modern, minimal design aesthetic
- Provide adequate spacing and padding
- Use readable fonts and appropriate font sizes
- Ensure sufficient color contrast for accessibility

#### FR-3.3: Responsive Design
- Ensure layout works on desktop screens
- Ensure layout adapts to tablet and mobile screens
- Maintain usability across different viewport sizes

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## 7. Business Rules

### BR-1: Form Validation Rules

#### BR-1.1: Name Field Validation
- Name field is **required** — cannot be empty or whitespace only
- Minimum length: 1 character (after trimming whitespace)
- Maximum length: 100 characters
- Must contain at least one non-whitespace character

#### BR-1.2: Email Field Validation
- Email field is **required** — cannot be empty
- Must match basic email format: `[text]@[text].[text]`
- Maximum length: 254 characters (RFC 5321 standard)
- Cannot contain only whitespace

#### BR-1.3: Duplicate Submissions
- System **allows** duplicate name and email combinations
- No uniqueness constraint enforced
- Each submission is treated as independent

### BR-2: Data Management Rules

#### BR-2.1: Data Persistence
- All submission data is stored **in-memory only** (client-side JavaScript)
- No data is sent to a backend server
- No data is persisted to localStorage, sessionStorage, or cookies
- All data is lost on page refresh or browser close

#### BR-2.2: Submission ID Generation
- Each submission receives a unique ID
- ID can be sequential number or timestamp-based
- IDs are used internally for list rendering (React keys, etc.)

#### BR-2.3: Timestamp Recording
- Each submission records the timestamp when created
- Timestamp uses client's local time
- Timestamp format can be ISO 8601 or Unix timestamp

### BR-3: UI Behavior Rules

#### BR-3.1: Form Submission Behavior
- Form submission prevents default browser form submission
- Form does not cause page reload
- Form clears immediately after successful validation and submission

#### BR-3.2: List Update Behavior
- Submission list updates immediately (synchronously) after form submission
- No loading states or delays required
- New submission appears instantly in the list

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## 8. Non-Functional Requirements

### NFR-1: Performance

#### NFR-1.1: Load Time
- Initial page load completes in under 2 seconds on standard broadband connection
- Application bundle size kept minimal (< 500KB total)

#### NFR-1.2: Runtime Performance
- Form submission and list update complete in under 100ms
- UI remains responsive with up to 1000 submissions in the list
- No noticeable lag when typing in form fields

### NFR-2: Security

#### NFR-2.1: Client-Side Security
- No sensitive data is collected or stored
- No authentication or authorization required
- Standard XSS protections via framework defaults (React, Vue, etc.)
- Input sanitization handled by framework's default escaping

#### NFR-2.2: Data Privacy
- No data transmitted to external servers
- No analytics or tracking implemented
- No cookies or local storage used

### NFR-3: Scalability

#### NFR-3.1: Client-Side Scalability
- Application handles up to 1000 in-memory submissions without performance degradation
- Beyond 1000 submissions, performance may degrade (acceptable for demo)
- No server-side scalability concerns (no backend)

### NFR-4: Compatibility

#### NFR-4.1: Browser Support
- Support latest versions of Chrome, Firefox, Safari, Edge
- Minimum browser versions: released within last 2 years
- No Internet Explorer support required

#### NFR-4.2: Device Support
- Fully functional on desktop (1920x1080 and 1366x768)
- Fully functional on tablet (768x1024 portrait and landscape)
- Fully functional on mobile (375x667 and larger)

### NFR-5: Accessibility

#### NFR-5.1: Basic Accessibility
- Form inputs have associated labels (explicit or aria-label)
- Form provides keyboard navigation support
- Sufficient color contrast ratios (WCAG AA minimum)
- Error messages are programmatically associated with form fields

### NFR-6: Maintainability

#### NFR-6.1: Code Quality
- Clean, readable code structure
- Minimal dependencies (use standard framework only)
- No complex state management libraries required
- Simple component structure (1-3 components maximum)

#### NFR-6.2: Technology Stack
- Use modern JavaScript framework (React, Vue, or vanilla JS)
- Use standard HTML5 and CSS3
- No backend framework or server required
- No database or external storage

### NFR-7: Usability

#### NFR-7.1: User Experience
- Form is immediately understandable without instructions
- Visual feedback provided for all user actions
- Error messages are clear and actionable
- Overall UI is clean and uncluttered

#### NFR-7.2: Visual Design
- Consistent spacing and alignment
- Professional appearance despite minimal design
- Adequate white space and breathing room
- Clear visual hierarchy (form → list)

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## Appendix: Out of Scope

The following are explicitly **excluded** from this application:

- ❌ User authentication or login
- ❌ Backend server or API
- ❌ Database or persistent storage
- ❌ Multiple pages or routing
- ❌ Edit or delete functionality for submissions
- ❌ Search, filter, or sort functionality
- ❌ Pagination
- ❌ Export/import functionality
- ❌ Email validation via external service
- ❌ Complex form fields (dates, dropdowns, checkboxes, etc.)
- ❌ File uploads
- ❌ Real-time collaboration or multi-user features
- ❌ Notifications or alerts
- ❌ Internationalization (i18n)
- ❌ Themes or dark mode
- ❌ Advanced animations or transitions

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**Document Version:** 1.0  
**Last Updated:** 2025-01-20  
**Author:** Senior Product Manager  
**Status:** Approved for Development