---
phase: 21-item-catalog-detail-pages
plan: 02
type: execute
wave: 1
depends_on: []
files_modified:
  - src/client/routes/threads/$threadId/index.tsx
  - src/client/routes/threads/$threadId/candidates/$candidateId.tsx
autonomous: true
requirements: [DETAIL-04]
must_haves:
  truths:
    - "Navigating to /threads/:threadId/candidates/:candidateId renders a full candidate detail page"
    - "Candidate detail page shows name, weight, price, notes, pros, cons, status, product link, image"
    - "Edit mode toggle works: read-only by default, editable inputs when toggled"
    - "Back navigation returns to parent thread"
    - "Pick as winner and delete candidate actions are available"
    - "Thread detail page at /threads/:threadId still works after route restructuring"
    - "Add candidate button on thread page uses modal dialog instead of slide-out panel"
  artifacts:
    - path: "src/client/routes/threads/$threadId/index.tsx"
      provides: "Restructured thread detail page (moved from $threadId.tsx)"
    - path: "src/client/routes/threads/$threadId/candidates/$candidateId.tsx"
      provides: "Candidate detail page with edit mode"
      exports: ["Route"]
  key_links:
    - from: "src/client/routes/threads/$threadId/candidates/$candidateId.tsx"
      to: "useThread hook"
      via: "useThread(threadId) to get candidate data"
      pattern: "useThread"
    - from: "src/client/routes/threads/$threadId/candidates/$candidateId.tsx"
      to: "useUpdateCandidate mutation"
      via: "updateCandidate.mutate"
      pattern: "useUpdateCandidate"
---

<objective>
Create the candidate detail page at `/threads/:threadId/candidates/:candidateId` with edit mode toggle, and restructure the thread route to support nested candidate routes. Replace the "Add Candidate" slide-out trigger on the thread page with a modal dialog.

Purpose: Creates the navigation target for candidate card clicks (rewired in Plan 03). The thread route restructuring is a prerequisite for the nested candidate route.
Output: Restructured thread route directory + new candidate detail page + add-candidate modal on thread page
</objective>

<execution_context>
@$HOME/.claude/get-shit-done/workflows/execute-plan.md
@$HOME/.claude/get-shit-done/templates/summary.md
</execution_context>

<context>
@.planning/PROJECT.md
@.planning/ROADMAP.md
@.planning/STATE.md
@.planning/phases/21-item-catalog-detail-pages/21-CONTEXT.md
@.planning/phases/21-item-catalog-detail-pages/21-RESEARCH.md

@src/client/routes/threads/$threadId.tsx
@src/client/hooks/useCandidates.ts
@src/client/hooks/useThreads.ts
@src/client/components/CandidateForm.tsx
@src/client/components/CandidateCard.tsx
@src/client/components/CandidateListItem.tsx
@src/client/stores/uiStore.ts

<interfaces>
<!-- Key hooks and types the executor needs -->

From src/client/hooks/useCandidates.ts:
```typescript
export function useCreateCandidate(threadId: number): UseMutationResult<CandidateResponse, Error, CreateCandidate & { imageFilename?: string }>;
export function useUpdateCandidate(threadId: number): UseMutationResult<CandidateResponse, Error, UpdateCandidate & { candidateId: number; imageFilename?: string }>;
export function useDeleteCandidate(threadId: number): UseMutationResult<{ success: boolean }, Error, number>;
```

From src/client/hooks/useThreads.ts:
```typescript
export function useThread(id: number): UseQueryResult<ThreadWithCandidates>;
export function useResolveThread(): UseMutationResult;
// ThreadWithCandidates.candidates[]: { id, threadId, name, weightGrams, priceCents, categoryId, categoryName, categoryIcon, notes, productUrl, imageFilename, imageUrl, status, pros, cons, sortOrder, createdAt, updatedAt }
```

From src/client/components/CandidateForm.tsx:
```typescript
interface CandidateFormProps { mode: "add" | "edit"; threadId: number; candidateId?: number | null; }
interface FormData {
  name: string; weightGrams: string; priceDollars: string; categoryId: number;
  notes: string; productUrl: string; imageFilename: string | null; pros: string; cons: string;
}
```

From src/client/stores/uiStore.ts (properties used by thread page):
```typescript
openCandidateAddPanel: () => void;     // WILL BE REMOVED in Plan 03
openResolveDialog: (threadId: number, candidateId: number) => void;  // KEEP
openConfirmDeleteCandidate: (id: number) => void;  // KEEP
```
</interfaces>
</context>

<tasks>

<task type="auto">
  <name>Task 1: Restructure thread route and create candidate detail page</name>
  <files>
    src/client/routes/threads/$threadId.tsx
    src/client/routes/threads/$threadId/index.tsx
    src/client/routes/threads/$threadId/candidates/$candidateId.tsx
  </files>
  <read_first>
    - src/client/routes/threads/$threadId.tsx (full file — must move to index.tsx intact)
    - src/client/hooks/useCandidates.ts (useUpdateCandidate, useDeleteCandidate hooks)
    - src/client/hooks/useThreads.ts (useThread — returns ThreadWithCandidates with candidates array)
    - src/client/components/CandidateForm.tsx (form fields and FormData interface to reuse for edit mode)
    - src/client/components/CategoryPicker.tsx (for edit mode category picker)
    - src/client/components/ImageUpload.tsx (for edit mode image upload)
    - src/client/routes/global-items/$globalItemId.tsx (layout pattern reference)
    - src/client/stores/uiStore.ts (openResolveDialog, openConfirmDeleteCandidate — keep using these)
  </read_first>
  <action>
    **Step 1: Restructure thread route directory.**
    - Move `src/client/routes/threads/$threadId.tsx` to `src/client/routes/threads/$threadId/index.tsx`
    - Delete the original `$threadId.tsx` file
    - The route path `/threads/$threadId` continues to work via the index.tsx convention
    - IMPORTANT: Do NOT manually edit `routeTree.gen.ts` — it auto-regenerates

    **Step 2: Create candidate detail page.**
    Create `src/client/routes/threads/$threadId/candidates/$candidateId.tsx` with `createFileRoute("/threads/$threadId/candidates/$candidateId")`.

    Per D-13: Shows candidate data — name, weight, price, notes, pros, cons, status, product link, image.
    Per D-14: Edit mode toggle — same pattern as item detail page (local `useState<boolean>(false)`). In edit mode:
    - Name, weight (grams string), price (dollars string), category (CategoryPicker), notes (textarea), product URL (text input), image (ImageUpload), pros (textarea), cons (textarea)
    - Save button calls `useUpdateCandidate(threadId).mutate({ candidateId, name, weightGrams: parsed, priceCents: parsed, categoryId, notes, productUrl, imageFilename, pros, cons })` with `onSuccess: () => setIsEditing(false)`
    - Cancel resets and exits edit mode
    - Initialize form from candidate data when entering edit mode

    Per D-15: Back navigation — `<Link to="/threads/$threadId" params={{ threadId: String(threadId) }}>← Back to thread</Link>`.
    Per D-16: Thread-specific actions:
    - "Pick as winner" button (only if thread is active/not resolved) — calls `useUIStore.openResolveDialog(threadId, candidateId)` which triggers the existing ResolveDialog in __root.tsx
    - "Delete candidate" button — calls `useUIStore.openConfirmDeleteCandidate(candidateId)` which triggers the existing CandidateDeleteDialog in __root.tsx

    Data fetching: Use `useThread(Number(threadIdParam))` to get the thread, then find the candidate via `thread.candidates.find(c => c.id === Number(candidateIdParam))`. This avoids needing a new API endpoint.

    Layout: Same gallery-like pattern as item detail — `max-w-3xl mx-auto px-4 sm:px-6 lg:px-8 py-6`. Hero image section, name as h1, badges (weight, price, category, status), pros/cons sections, notes section.

    Loading state: shimmer placeholders.
    Error state: "Candidate not found" with back link to thread.

    Status display: Show current status using the StatusBadge component (but read-only — status changes happen via the existing status cycle on the card, not on the detail page).
  </action>
  <verify>
    <automated>cd /home/jean-luc-makiola/Development/projects/GearBox && bun run lint 2>&1 | tail -5</automated>
  </verify>
  <acceptance_criteria>
    - test -f src/client/routes/threads/\$threadId/index.tsx
    - test ! -f src/client/routes/threads/\$threadId.tsx
    - grep -q "createFileRoute.*threads.*threadId.*candidates.*candidateId" src/client/routes/threads/\$threadId/candidates/\$candidateId.tsx
    - grep -q "useThread" src/client/routes/threads/\$threadId/candidates/\$candidateId.tsx
    - grep -q "useUpdateCandidate" src/client/routes/threads/\$threadId/candidates/\$candidateId.tsx
    - grep -q "isEditing" src/client/routes/threads/\$threadId/candidates/\$candidateId.tsx
    - grep -q "Back to thread" src/client/routes/threads/\$threadId/candidates/\$candidateId.tsx
    - grep -q "openResolveDialog\|Pick as winner" src/client/routes/threads/\$threadId/candidates/\$candidateId.tsx
  </acceptance_criteria>
  <done>
    - Thread route restructured: `$threadId.tsx` moved to `$threadId/index.tsx`, `/threads/:threadId` still works
    - Candidate detail page renders at `/threads/:threadId/candidates/:candidateId`
    - Shows all candidate data: name, weight, price, notes, pros, cons, status, image
    - Edit mode toggle works with form fields for all editable properties
    - Back link returns to parent thread
    - Pick as winner and delete actions available via existing dialogs
  </done>
</task>

<task type="auto">
  <name>Task 2: Add candidate modal dialog on thread page</name>
  <files>
    src/client/routes/threads/$threadId/index.tsx
  </files>
  <read_first>
    - src/client/routes/threads/$threadId/index.tsx (just restructured — find the "Add Candidate" button)
    - src/client/components/CandidateForm.tsx (form fields to replicate in modal)
    - src/client/hooks/useCandidates.ts (useCreateCandidate hook)
    - src/client/components/CategoryPicker.tsx (for category field)
    - src/client/components/ImageUpload.tsx (for image field)
  </read_first>
  <action>
    Per D-28: Replace the `openCandidateAddPanel()` call on the thread page with a local modal dialog for adding candidates.

    In `src/client/routes/threads/$threadId/index.tsx`:
    1. Add local state: `const [addCandidateOpen, setAddCandidateOpen] = useState(false)`
    2. Replace the existing "Add Candidate" button's `onClick={() => openCandidateAddPanel()}` with `onClick={() => setAddCandidateOpen(true)}`
    3. Remove the `openCandidateAddPanel` import from useUIStore
    4. Add an `AddCandidateModal` component (can be defined in the same file or as a separate component — Claude's discretion) that:
       - Renders as a fixed overlay with backdrop (`fixed inset-0 z-50 flex items-center justify-center`)
       - Contains a form with fields: name (required), weight (grams), price (dollars), category (CategoryPicker), notes, product URL, image (ImageUpload), pros, cons
       - Uses `useCreateCandidate(threadId)` for submission
       - On success: closes modal, form resets
       - On cancel/backdrop click: closes modal
       - Style consistent with the existing CandidateDeleteDialog and ResolveDialog patterns in `__root.tsx`
    5. Render the modal conditionally: `{addCandidateOpen && <AddCandidateModal threadId={threadId} onClose={() => setAddCandidateOpen(false)} />}`

    The modal should be a reasonable size (`max-w-lg`) with scrollable content if needed. Form fields should match CandidateForm's field set. Validation: name is required (show inline error if empty on submit).
  </action>
  <verify>
    <automated>cd /home/jean-luc-makiola/Development/projects/GearBox && bun run lint 2>&1 | tail -5</automated>
  </verify>
  <acceptance_criteria>
    - grep -q "addCandidateOpen\|AddCandidateModal" src/client/routes/threads/\$threadId/index.tsx
    - grep -q "useCreateCandidate" src/client/routes/threads/\$threadId/index.tsx
    - grep -qv "openCandidateAddPanel" src/client/routes/threads/\$threadId/index.tsx
  </acceptance_criteria>
  <done>
    - Thread page "Add Candidate" button opens a modal dialog instead of a slide-out panel
    - Modal contains all candidate form fields (name, weight, price, category, notes, URL, image, pros, cons)
    - Creating a candidate via the modal works and refreshes the thread data
    - The `openCandidateAddPanel` UIStore call is no longer used on the thread page
  </done>
</task>

</tasks>

<verification>
- `bun run lint` passes with no errors
- `bun run dev` starts and routes work:
  - `/threads/:threadId` renders thread detail (unchanged behavior after restructuring)
  - `/threads/:threadId/candidates/:candidateId` renders candidate detail with edit toggle
  - "Add Candidate" button on thread page opens modal, candidate creation works
</verification>

<success_criteria>
- Thread route restructured without breaking existing `/threads/:threadId` functionality
- Candidate detail page at `/threads/:threadId/candidates/:candidateId` with edit mode
- Add candidate modal replaces slide-out panel trigger on thread page
- All existing thread page functionality preserved (reorder, view modes, impact deltas)
- Lint passes cleanly
</success_criteria>

<output>
After completion, create `.planning/phases/21-item-catalog-detail-pages/21-02-SUMMARY.md`
</output>