---
phase: 03-images
plan: 02
subsystem: images
tags: [file-upload, drag-drop, multipart, optimistic-ui, form-actions]

# Dependency graph
requires:
  - phase: 03-01
    provides: image repository, storage utilities, thumbnail generation
provides:
  - uploadImage form action for multipart uploads
  - ImageUpload component with drag-drop
  - QuickCapture integration for image attachment
affects: [03-03-camera-capture, 03-04-gallery-display]

# Tech tracking
tech-stack:
  added: []
  patterns: [optimistic preview with URL.createObjectURL, form action multipart handling]

key-files:
  created:
    - src/lib/components/ImageUpload.svelte
  modified:
    - src/routes/+page.server.ts
    - src/lib/components/QuickCapture.svelte

key-decisions:
  - "Image upload via fetch to form action (not HTML form) for programmatic control"
  - "Optimistic preview using URL.createObjectURL for instant feedback"
  - "Upload image after entry creation to ensure valid entryId"
  - "Entries returned with images array from load function"

patterns-established:
  - "Form action multipart: formData.get('image') as File for file uploads"
  - "Optimistic UI: show preview immediately, upload in background"
  - "Object URL cleanup: revoke after upload completes"

# Metrics
duration: 2min
completed: 2026-01-29
---

# Phase 03 Plan 02: File Upload Summary

**Multipart file upload with drag-drop support and optimistic preview using form actions**

## Performance

- **Duration:** 2 min
- **Started:** 2026-01-29T14:26:39Z
- **Completed:** 2026-01-29T14:28:42Z
- **Tasks:** 3
- **Files modified:** 3

## Accomplishments
- uploadImage form action handles multipart file uploads
- Validates file type (image/*) and entry existence before processing
- Generates thumbnail using Sharp infrastructure from 03-01
- ImageUpload component with drag-drop zone and button fallback
- Optimistic preview shows image immediately during upload
- QuickCapture allows attaching image to new entries
- Load function returns entries with their images attached

## Task Commits

Each task was committed atomically:

1. **Task 1: Upload form action with thumbnail generation** - `de3aa5a` (feat)
2. **Task 2: ImageUpload component with drag-drop** - `a35b07e` (feat)
3. **Task 3: Integrate upload into QuickCapture** - `400e499` (feat)

## Files Created/Modified
- `src/routes/+page.server.ts` - Added uploadImage action and entries with images in load
- `src/lib/components/ImageUpload.svelte` - New drag-drop upload component (164 lines)
- `src/lib/components/QuickCapture.svelte` - Added image attachment button and upload flow

## Decisions Made
- **Fetch to form action:** Use fetch() with FormData instead of HTML form submission for programmatic control over the upload flow
- **Optimistic preview:** Use URL.createObjectURL() for instant preview while upload happens in background
- **Sequential upload:** Create entry first, then upload image with the new entry ID to ensure valid foreign key
- **Images in load:** Attach images array to each entry in the load function for immediate display

## Deviations from Plan

None - plan executed exactly as written.

## Issues Encountered

None.

## User Setup Required

None - no external service configuration required.

## Next Phase Readiness
- File upload infrastructure complete and ready for use
- Camera capture (03-03) can reuse uploadImageForEntry pattern
- Gallery display (03-04) can use images array from load function

---
*Phase: 03-images*
*Completed: 2026-01-29*
