---
phase: 09-weight-classification-and-visualization
plan: 02
subsystem: ui
tags: [react, recharts, donut-chart, tailwind, weight-visualization, pie-chart]

# Dependency graph
requires:
  - phase: 09-weight-classification-and-visualization
    provides: classification column on setupItems, getSetupWithItems returns classification field, SetupItemWithCategory type
provides:
  - WeightSummaryCard component with donut chart and classification subtotals
  - Pill toggle for category/classification chart views
  - Recharts integration (PieChart, Pie, Cell, Tooltip, Label, ResponsiveContainer)
  - Custom tooltip with formatted weight and percentage display
affects: []

# Tech tracking
tech-stack:
  added: [recharts]
  patterns: [donut chart with center label, pill toggle view switcher, chart data transformation from items array]

key-files:
  created:
    - src/client/components/WeightSummaryCard.tsx
  modified:
    - src/client/routes/setups/$setupId.tsx
    - package.json

key-decisions:
  - "Recharts v3 Cell component used for per-slice colors (still functional, deprecated for v4)"
  - "Fixed numeric height on ResponsiveContainer (180px) to avoid zero-height rendering"
  - "Zero-weight items filtered out before chart data to prevent invisible/NaN slices"

patterns-established:
  - "Donut chart: PieChart with Pie innerRadius/outerRadius and Label position=center for hole text"
  - "Chart data transformation: group items by key, sum weights, compute percentages, filter zeroes"
  - "Pill toggle view switcher: reusable pattern for switching between data breakdowns"

requirements-completed: [CLAS-02, VIZZ-01, VIZZ-02, VIZZ-03]

# Metrics
duration: 2min
completed: 2026-03-16
---

# Phase 9 Plan 2: Weight Breakdown Visualization Summary

**Recharts donut chart with category/classification toggle, weight subtotals card, and hover tooltips inside setup detail page**

## Performance

- **Duration:** 2 min
- **Started:** 2026-03-16T14:18:52Z
- **Completed:** 2026-03-16T14:20:57Z
- **Tasks:** 1 (+ 1 auto-approved checkpoint)
- **Files modified:** 4

## Accomplishments
- Created WeightSummaryCard component with donut chart visualization using Recharts
- Implemented pill toggle switching between category and classification chart views
- Built weight subtotals display (Base | Worn | Consumable | Total) with colored indicator dots
- Added custom tooltip showing segment name, formatted weight, and percentage on hover
- Rendered total weight in center of donut hole using selected weight unit
- Wired WeightSummaryCard into setup detail page below sticky bar (only when items exist)
- Handled edge case of zero-weight items with placeholder message

## Task Commits

Each task was committed atomically:

1. **Task 1: Install Recharts, create WeightSummaryCard, wire into setup detail page** - `d098277` (feat)

## Files Created/Modified
- `src/client/components/WeightSummaryCard.tsx` - New component with donut chart, pill toggle, subtotals, and custom tooltip
- `src/client/routes/setups/$setupId.tsx` - Added WeightSummaryCard import and rendering inside itemCount > 0 block
- `package.json` - Added recharts dependency
- `bun.lock` - Updated lockfile with recharts and its dependencies

## Decisions Made
- Used Recharts v3 Cell component for per-slice colors (functional in v3, deprecated for v4 removal)
- Fixed 180px height on ResponsiveContainer to prevent zero-height rendering issue
- Filter zero-weight entries before passing to chart to avoid invisible/NaN segments
- Default view mode is "category" (most useful initial view for gear analysis)

## Deviations from Plan

None - plan executed exactly as written.

## Issues Encountered
None

## User Setup Required
None - no external service configuration required.

## Next Phase Readiness
- Phase 9 complete: classification badges + weight visualization both functional
- All 121 tests pass, build succeeds, lint clean on modified files
- Recharts available for any future chart features

## Self-Check: PASSED

All 3 files verified present. Task commit (d098277) confirmed in git history. recharts found in package.json. WeightSummaryCard found in $setupId.tsx.

---
*Phase: 09-weight-classification-and-visualization*
*Completed: 2026-03-16*