# Phase 1: Setup & Foundation

**Analysis Date:** 2026-01-24

## Domain Boundary

The scope of Phase 1: Setup & Foundation is limited to establishing the foundational technical infrastructure and core UI components necessary for the weekly todo list application. This phase encompasses:

- Project initialization with appropriate tooling and framework selection
- Core component architecture and implementation
- Basic UI layout and user interaction patterns
- Data persistence layer (localStorage)
- Navigation controls for week progression
- Drag-and-drop functionality for task reorganization
- Integration of fundamental dependencies

This phase does not include:
- Calendar integration features
- Advanced task management capabilities
- Data export/import functionality
- Multi-user features
- Offline functionality
- Mobile-specific optimizations

## Implementation Decisions

### UI Layout and Presentation
- **Layout Style**: Timeline-based with fixed width days, presenting a clean weekly view organized by day
- **Task Presentation**: Mixed approach - tasks are stacked vertically within each day slot, with some time-based positioning for better visual organization
- **Visual Differentiation**: Different colors and styling used to distinguish tasks from calendar events in the view
- **Task Card Design**: Basic information display including title and date only, focusing on core task details

### Data Management
- **Persistence**: Connected to browser's localStorage for data persistence between sessions
- **Storage Layer**: Custom persistence functions implemented for saving and loading tasks
- **Data Structure**: Tasks stored with full metadata including ID, title, date, description, completion status, and optional category

### Navigation and Interaction
- **Navigation Controls**: Both standard previous/next buttons and a date picker for direct navigation between weeks
- **Interaction Model**: Drag-and-drop mechanics enabled for moving tasks between days in the calendar view
- **View Switching**: Basic capability for switching between day and week views (though week view is primary focus)

## OpenCode's Discretion

OpenCode has flexibility to implement the following aspects:

- Component styling and visual design within the constraints of a clean, minimalist interface
- Specific implementation details of drag-and-drop integration
- Refinement of the mixed presentation approach for tasks within the weekly grid
- Optimization of data persistence methods for performance
- UI/UX enhancements within the established framework

## Specific Ideas

### Component Architecture
- Implement a structured component hierarchy with clear separation of concerns:
  - CalendarGrid: Main container for the weekly view
  - TaskCard: Individual task representation with editing capabilities
  - NavigationControls: Previous/next week navigation with date picker
  - TaskForm: Modal or inline form for task creation/editing

### Data Flow
- Establish a clear data flow pattern where:
  - CalendarGrid receives task data and manages state
  - TaskCard handles individual task interactions
  - NavigationControls coordinate week switching
  - Data persistence functions handle storage operations

### State Management
- Implement a centralized state management approach for:
  - Current week display
  - Task data
  - Navigation state
  - UI interaction states

## Deferred Ideas

The following features and enhancements are intentionally deferred to later phases:

### Calendar Integration
- Google Calendar and Apple Calendar connection functionality
- Calendar event synchronization with tasks
- Event filtering and visibility controls

### Advanced Task Management
- Recurring tasks with various recurrence patterns
- Category/tag assignment system
- Reminder and priority setting capabilities
- Detailed task descriptions and notes

### Data Management
- Export to CSV/JSON functionality
- Import from CSV/JSON functionality
- Manual backup and restore capabilities

### User Experience Enhancements
- Mobile-responsive design optimizations
- Multi-user collaboration features
- Advanced filtering and search capabilities
- Rich text formatting for task descriptions