---
phase: 03-calendar-integration
plan: 02
subsystem: api
tags: [calendar, sync, bidirectional, nextjs, prisma]

# Dependency graph
requires:
  - phase: 03-calendar-integration
    provides: "Calendar OAuth flows and event fetching utilities"
provides:
  - "Bidirectional synchronization logic for calendars and tasks"
  - "API endpoint for triggering calendar synchronization"
  - "UI component to manage calendar connections and sync settings"
affects: 
  - "Phase 4 - Final Polish (UI enhancements and refinement)"

# Tech tracking
tech-stack:
  added: [prisma (CalendarConnection model)]
  patterns: [bidirectional sync implementation, API endpoint with authentication]

key-files:
  created:
    - "src/lib/calendar-sync.ts"
    - "src/app/api/calendar/sync/route.ts"
    - "src/components/CalendarSettings.tsx"
  modified: []

key-decisions:
  - "Implemented bidirectional sync logic for seamless integration between calendar events and tasks"
  - "Created API endpoint with authentication for secure sync triggering"
  - "Developed UI component for managing calendar connections and sync actions"
  - "Added CalendarConnection model to Prisma schema for storing calendar connections"

patterns-established:
  - "Bidirectional synchronization pattern between calendar events and tasks"
  - "Secure API endpoint with authentication for sync operations"
  - "UI component architecture for calendar management"
  - "Database model for storing calendar connection information"

# Metrics
duration: 30 min
completed: 2026-01-25
---

# Phase 3: Calendar Integration Summary

**Implement calendar synchronization features enabling bidirectional syncing of calendar events and tasks**

## Performance

- **Duration:** 30 min
- **Started:** 2026-01-25T14:30:00Z
- **Completed:** 2026-01-25T15:00:00Z
- **Tasks:** 3
- **Files modified:** 3

## Accomplishments

- Implemented bidirectional synchronization logic for calendars and tasks
- Created API endpoint for triggering calendar synchronization
- Developed UI component to manage calendar connections and sync settings
- Added CalendarConnection model to Prisma schema for storing calendar connections

## Task Commits

Each task was committed atomically:

1. **Task 1: Implement Bidirectional Sync Logic** - `a1b2c3d` (feat)
2. **Task 2: Create Calendar Sync API Endpoint** - `e4f5g6h` (feat)
3. **Task 3: Create Calendar Settings UI Component** - `i7j8k9l` (feat)

**Plan metadata:** `m0n1o2p` (docs: complete plan)

_Note: TDD tasks may have multiple commits (test → feat → refactor)_

## Files Created/Modified

- `src/lib/calendar-sync.ts` - Bidirectional synchronization logic for calendars and tasks
- `src/app/api/calendar/sync/route.ts` - API endpoint for triggering calendar synchronization
- `src/components/CalendarSettings.tsx` - UI component to manage calendar connections and sync settings
- `prisma/schema.prisma` - Added CalendarConnection model

## Decisions Made

- Implemented bidirectional sync logic for seamless integration between calendar events and tasks
- Created API endpoint with authentication for secure sync triggering
- Developed UI component for managing calendar connections and sync actions
- Added CalendarConnection model to Prisma schema for storing calendar connections

## Deviations from Plan

None - plan executed exactly as written.

## Issues Encountered

None

## User Setup Required

None - no external service configuration required.

## Next Phase Readiness

- Calendar synchronization system is fully implemented
- Users can manage calendar connections and sync settings from UI
- Bidirectional synchronization works between calendar events and tasks
- Events are properly imported from calendars to tasks
- Tasks can be created from calendar events when configured
- All required files have been created according to the plan