Tasks: Basic Todo App

Overview

**Total Estimated Time:** 12-16 hours **Target Timeline:** 3-4 days (part-time development)

This task breakdown follows an incremental development approach, enabling continuous testing and validation at each phase.

Phase Breakdown

| Phase | Tasks | Estimated Time | Dependencies | |-------|-------|----------------|-------------| | Foundation | 8 tasks | 3-4 hours | None | | Core Features | 12 tasks | 6-8 hours | Foundation complete | | Enhancement | 6 tasks | 2-3 hours | Core complete | | Testing & QA | 5 tasks | 1-2 hours | All features complete |

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Phase 1: Foundation Setup

*Estimated Time: 3-4 hours*

Project Setup

• [x] Initialize React + TypeScript project with Vite
• [x] Configure ESLint and Prettier
• [x] Set up basic folder structure (`src/components`, `src/services`, etc.)
• [x] Install required dependencies (React, TypeScript, Tailwind CSS)
• [x] Create basic HTML template in `public/index.html`
• [x] Set up Tailwind CSS configuration
• [x] Create global styles and CSS variables
• [x] Test development server startup (`npm run dev`)

**Dependencies:** None **Deliverable:** Working development environment

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Phase 2: Core Features Implementation

*Estimated Time: 6-8 hours*

Data Layer

• [x] Create `Todo` interface in `src/types/todo.ts`
• [x] Implement `todoService.ts` with localStorage operations
• [x] `loadTodos()` - Load from localStorage
• [x] `saveTodos()` - Save to localStorage
• [x] `addTodo()` - Create new todo
• [x] `updateTodo()` - Update existing todo
• [x] `deleteTodo()` - Remove todo
• [x] Create `useTodos.ts` custom hook for state management
• [x] Add input validation and sanitization utilities

UI Components

• [x] Create main `TodoApp.tsx` component with layout
• [x] Build `TodoForm.tsx` for adding new todos
• [x] Input field with proper validation
• [x] Add button with form submission
• [x] Handle empty input prevention
• [x] Build `TodoList.tsx` for displaying todos
• [x] Handle empty state display
• [x] Render list of TodoItem components
• [x] Build `TodoItem.tsx` for individual todos
• [x] Checkbox for completion toggle
• [x] Text display with strikethrough for completed
• [x] Delete button with confirmation
• [x] Edit functionality (inline or modal)

Integration

• [x] Connect TodoForm to add todo functionality
• [x] Connect TodoList to display todos from state
• [x] Connect TodoItem actions to state updates
• [x] Implement localStorage persistence
• [x] Add basic error handling for storage operations

**Dependencies:** Foundation complete **Deliverable:** Working todo CRUD operations

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Phase 3: Enhancement Features

*Estimated Time: 2-3 hours*

Statistics & Filtering

• [x] Create `TodoStats.tsx` component showing total/completed counts
• [x] Add "Clear Completed" functionality
• [x] Implement basic keyboard shortcuts (Enter to submit, Escape to cancel)

Polish & UX

• [x] Add loading states and transitions
• [x] Implement responsive design for mobile devices
• [x] Add proper focus management for accessibility
• [x] Enhance visual feedback (hover states, animations)
• [x] Add confirmation dialogs for destructive actions
• [x] Implement proper error messages for user feedback

**Dependencies:** Core features complete **Deliverable:** Polished, user-friendly application

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Phase 4: Testing & Quality Assurance

*Estimated Time: 1-2 hours*

Testing

• [ ] Manual testing of all CRUD operations
• [ ] Test localStorage persistence across browser sessions
• [ ] Cross-browser testing (Chrome, Firefox, Safari)
• [ ] Mobile responsiveness testing
• [ ] Accessibility testing (keyboard navigation, screen readers)

**Dependencies:** All features complete **Deliverable:** Tested, production-ready application

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Task Dependencies

Critical Path

1. Project Setup → Data Layer → UI Components → Integration
2. Core Features → Enhancement Features → Testing

Parallel Development Opportunities

• UI components can be built while data layer is being implemented
• Styling and responsiveness can be done alongside feature development
• Testing can begin as soon as individual features are complete

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Risk Mitigation Tasks

Data Loss Prevention

• [ ] Implement storage error handling with user notifications
• [ ] Add data backup/export functionality as JSON download
• [ ] Create storage quota monitoring with warnings

Performance Optimization

• [ ] Implement debounced storage saves (prevent excessive writes)
• [ ] Add performance monitoring for large todo lists (>100 items)
• [ ] Optimize re-renders with React.memo where appropriate

Browser Compatibility

• [ ] Test localStorage availability and fallback handling
• [ ] Verify CSS Grid/Flexbox support across target browsers
• [ ] Add feature detection for critical browser APIs

Error Handling

• [ ] Implement comprehensive error boundaries
• [ ] Add user-friendly error messages
• [ ] Create fallback UI for JavaScript disabled scenarios

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Development Guidelines

Code Quality Standards

• [ ] Follow React best practices (hooks, functional components)
• [ ] Maintain TypeScript strict mode compliance
• [ ] Ensure all components are properly typed
• [ ] Use consistent naming conventions
• [ ] Add JSDoc comments for complex functions

Testing Checkpoints

After each phase, verify:

• [ ] All features work as specified in requirements
• [ ] No console errors or warnings
• [ ] Responsive design functions properly
• [ ] Data persists correctly in localStorage
• [ ] Application loads within performance targets (<2s)

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Deployment Preparation

Build & Deploy

• [ ] Run production build (`npm run build`)
• [ ] Test production build locally (`npm run preview`)
• [ ] Optimize bundle size and verify performance
• [ ] Configure deployment to static hosting (Netlify/Vercel)
• [ ] Set up custom domain (if applicable)
• [ ] Test deployed application functionality

Documentation

• [ ] Create README.md with setup and usage instructions
• [ ] Document any known limitations or browser requirements
• [ ] Add screenshots of the working application

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Success Criteria

Functional Requirements Met

• [ ] All P0 requirements implemented and working
• [ ] All P1 requirements implemented (edit, visual differentiation, validation)
• [ ] At least 2 P2 requirements implemented (counter, clear completed, shortcuts)

Quality Metrics Achieved

• [ ] Application loads in <2 seconds
• [ ] All operations respond in <100ms
• [ ] Works correctly across all target browsers
• [ ] Passes accessibility guidelines (keyboard navigation)
• [ ] Mobile responsive design functions properly

User Experience Validated

• [ ] New user can add, complete, and delete a todo within 30 seconds
• [ ] Application works offline after initial load
• [ ] Data persists across browser sessions
• [ ] Error states provide helpful feedback

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**Review Status:** Ready for review **Next Phase:** Implementation (pending approval)