# Tree Fork UI Implementation Plan

> **For Claude:** REQUIRED SUB-SKILL: Use superpowers:executing-plans to implement this plan task-by-task.

**Goal:** Add an explicit `ForkModal` with a "Reason for Forking" field to replace the silent fork flow, and show a "Fork" chip badge on forked tree cards in the library and My Trees views.

**Architecture:** The backend is fully complete (POST `/trees/:id/fork` accepts `{ name, fork_reason }`). The frontend `treesApi.fork()` already accepts these params. We need: (1) `ForkInfo` types added to `tree.ts`, (2) a new `ForkModal` component, (3) updated fork handlers in `TreeLibraryPage` and `MyTreesPage` to open the modal instead of forking silently, (4) a "Fork" chip in all three card views (grid, list, table).

**Tech Stack:** React 19, TypeScript, Tailwind CSS, Lucide React, `treesApi.fork(id, { name, fork_reason })` already wired.

---

## Context for the Implementer

- `treesApi.fork(id, data?)` is at `frontend/src/api/trees.ts:42` — already accepts `{ fork_reason?, name? }`
- `onForkTree` prop exists on all three card views and currently passes only `treeId: string`
- `TreeLibraryPage` has `handleForkTree(treeId: string)` at line ~247 that calls `treesApi.fork(treeId)` silently
- `MyTreesPage` does NOT currently have a fork handler — the "Fork" UI there is an informational message (line ~215), not a button wired to `onForkTree`
- `TreeListItem` (used by all three views) does NOT yet have `fork_depth` or `parent_tree_id` — must add these
- `MyTreesPage` already uses `tree.parent_tree_id` at line ~283 for a "Forked from" display block — this field must be on the type for that to compile cleanly after our changes
- All three card views are in `frontend/src/components/library/`
- Design system: `bg-violet-400/15 text-violet-400` for the Fork chip; `bg-gradient-brand` for the Fork submit button; modal structure uses `bg-card border-border rounded-xl`

---

### Task 1: Add `ForkInfo` type and fork fields to `TreeListItem` and `Tree`

**Files:**
- Modify: `frontend/src/types/tree.ts:142-190`

This is a pure type change — no runtime behavior changes.

**Step 1: Add `ForkInfo` interface and fork fields**

In `frontend/src/types/tree.ts`, after line 141 (the `ProceduralTreeStructure` closing brace), add `ForkInfo` then update `Tree` and `TreeListItem`:

```typescript
export interface ForkInfo {
  parent_tree_id: string
  parent_tree_name: string | null
  fork_depth: number
  fork_reason: string | null
  has_parent_updates: boolean
}
```

Add to `Tree` interface (after `usage_count: number`):
```typescript
  fork_info?: ForkInfo | null
  parent_tree_id?: string | null
  fork_depth?: number
```

Add to `TreeListItem` interface (after `visibility` field):
```typescript
  fork_depth?: number
  parent_tree_id?: string | null
```

**Step 2: Verify TypeScript compiles cleanly**

```bash
cd /home/michaelchihlas/dev/patherly/frontend && npm run build 2>&1 | tail -20
```

Expected: Clean build, no errors.

**Step 3: Commit**

```bash
cd /home/michaelchihlas/dev/patherly
git add frontend/src/types/tree.ts
git commit -m "feat: add ForkInfo type and fork fields to Tree/TreeListItem

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>"
```

---

### Task 2: Create `ForkModal` component

**Files:**
- Create: `frontend/src/components/library/ForkModal.tsx`

**Step 1: Create the component file**

Create `frontend/src/components/library/ForkModal.tsx` with this exact content:

```tsx
import { useState } from 'react'
import { GitBranch, X } from 'lucide-react'
import { treesApi } from '@/api/trees'
import { toast } from '@/lib/toast'
import { cn } from '@/lib/utils'
import { useNavigate } from 'react-router-dom'

interface ForkModalProps {
  treeId: string
  treeName: string
  onClose: () => void
}

export function ForkModal({ treeId, treeName, onClose }: ForkModalProps) {
  const navigate = useNavigate()
  const [name, setName] = useState(`Copy of ${treeName}`)
  const [forkReason, setForkReason] = useState('')
  const [isSubmitting, setIsSubmitting] = useState(false)
  const [error, setError] = useState<string | null>(null)

  const handleSubmit = async (e: React.FormEvent) => {
    e.preventDefault()
    if (!name.trim()) return
    setIsSubmitting(true)
    setError(null)
    try {
      await treesApi.fork(treeId, {
        name: name.trim(),
        fork_reason: forkReason.trim() || undefined,
      })
      toast.success('Flow forked successfully')
      onClose()
      navigate('/my-trees')
    } catch (err) {
      console.error('Failed to fork flow:', err)
      setError('Failed to fork flow. Please try again.')
    } finally {
      setIsSubmitting(false)
    }
  }

  return (
    <div className="fixed inset-0 z-50 flex items-center justify-center bg-black/60 p-4">
      <div className="w-full max-w-md rounded-xl border border-border bg-card shadow-xl">
        {/* Header */}
        <div className="flex items-center justify-between border-b border-border px-5 py-4">
          <div className="flex items-center gap-2">
            <GitBranch className="h-4 w-4 text-muted-foreground" />
            <h2 className="text-sm font-semibold text-foreground">Fork Flow</h2>
          </div>
          <button
            onClick={onClose}
            className="rounded-md p-1 text-muted-foreground hover:bg-accent hover:text-foreground"
          >
            <X className="h-4 w-4" />
          </button>
        </div>

        {/* Body */}
        <form onSubmit={handleSubmit} className="space-y-4 px-5 py-4">
          <div>
            <label className="mb-1.5 block text-xs font-medium text-muted-foreground">
              Name <span className="text-red-400">*</span>
            </label>
            <input
              type="text"
              value={name}
              onChange={(e) => setName(e.target.value)}
              required
              autoFocus
              className={cn(
                'w-full rounded-lg border border-border bg-card px-3 py-2 text-sm text-foreground',
                'placeholder:text-muted-foreground focus:border-primary focus:outline-none focus:ring-1 focus:ring-primary/20'
              )}
            />
          </div>

          <div>
            <label className="mb-1.5 block text-xs font-medium text-muted-foreground">
              Reason for Forking{' '}
              <span className="text-muted-foreground/60">(optional)</span>
            </label>
            <textarea
              value={forkReason}
              onChange={(e) => setForkReason(e.target.value)}
              rows={3}
              placeholder="e.g. customizing for a specific client…"
              className={cn(
                'w-full resize-none rounded-lg border border-border bg-card px-3 py-2 text-sm text-foreground',
                'placeholder:text-muted-foreground focus:border-primary focus:outline-none focus:ring-1 focus:ring-primary/20'
              )}
            />
          </div>

          {error && (
            <p className="text-xs text-red-400">{error}</p>
          )}

          {/* Footer */}
          <div className="flex justify-end gap-2 pt-1">
            <button
              type="button"
              onClick={onClose}
              className="rounded-lg border border-border px-4 py-2 text-sm text-muted-foreground hover:bg-accent hover:text-foreground"
            >
              Cancel
            </button>
            <button
              type="submit"
              disabled={isSubmitting || !name.trim()}
              className="bg-gradient-brand flex items-center gap-2 rounded-lg px-4 py-2 text-sm font-medium text-white shadow-lg shadow-primary/20 hover:opacity-90 disabled:opacity-40"
            >
              {isSubmitting ? 'Forking…' : 'Fork Flow'}
            </button>
          </div>
        </form>
      </div>
    </div>
  )
}
```

**Step 2: Verify TypeScript compiles cleanly**

```bash
cd /home/michaelchihlas/dev/patherly/frontend && npm run build 2>&1 | tail -20
```

Expected: Clean build, no errors.

**Step 3: Commit**

```bash
cd /home/michaelchihlas/dev/patherly
git add frontend/src/components/library/ForkModal.tsx
git commit -m "feat: add ForkModal component with name and reason fields

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>"
```

---

### Task 3: Update `TreeLibraryPage` to open `ForkModal`

**Files:**
- Modify: `frontend/src/pages/TreeLibraryPage.tsx`

The current `handleForkTree` at ~line 247 calls `treesApi.fork(treeId)` silently. Replace it with state that opens `ForkModal`.

**Step 1: Add import for `ForkModal` and `TreeListItem`**

At the top of `TreeLibraryPage.tsx`, the file already imports `TreeListItem` from `@/types`. Add `ForkModal` to the library component imports. Find the line that imports from `@/components/library/...` and add:

```tsx
import { ForkModal } from '@/components/library/ForkModal'
```

**Step 2: Replace fork state**

Find (around line 76):
```tsx
  // Fork state
  const [isForkingTree, setIsForkingTree] = useState(false)
```

Replace with:
```tsx
  // Fork modal state
  const [forkTarget, setForkTarget] = useState<TreeListItem | null>(null)
```

**Step 3: Replace `handleForkTree`**

Find (around line 247):
```tsx
  const handleForkTree = async (treeId: string) => {
    if (isForkingTree) return
    setIsForkingTree(true)
    try {
      await treesApi.fork(treeId)
      toast.success('Flow forked successfully')
      navigate('/my-trees')
    } catch (err) {
      console.error('Failed to fork flow:', err)
      toast.error('Failed to fork flow')
    } finally {
      setIsForkingTree(false)
    }
  }
```

Replace with:
```tsx
  const handleForkTree = (treeId: string) => {
    const tree = trees.find((t) => t.id === treeId)
    if (tree) setForkTarget(tree)
  }
```

Note: `trees` is the existing state variable holding the fetched tree list. If the variable is named differently in context, use the correct name.

**Step 4: Add `ForkModal` to JSX**

Find the closing `</div>` of the page's root element (near the end of the return statement, after all the other modals like `FolderEditModal`, `ConfirmDialog`). Add before the root closing tag:

```tsx
      {forkTarget && (
        <ForkModal
          treeId={forkTarget.id}
          treeName={forkTarget.name}
          onClose={() => setForkTarget(null)}
        />
      )}
```

**Step 5: Verify TypeScript compiles cleanly**

```bash
cd /home/michaelchihlas/dev/patherly/frontend && npm run build 2>&1 | tail -20
```

Expected: Clean build, no errors. If there are unused import errors for `treesApi` (if it was only used by the old `handleForkTree`), check whether `treesApi` is still used elsewhere on the page; if not, remove it from imports.

**Step 6: Commit**

```bash
cd /home/michaelchihlas/dev/patherly
git add frontend/src/pages/TreeLibraryPage.tsx
git commit -m "feat: open ForkModal on fork action in TreeLibraryPage

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>"
```

---

### Task 4: Update `MyTreesPage` to open `ForkModal`

**Files:**
- Modify: `frontend/src/pages/MyTreesPage.tsx`

`MyTreesPage` does NOT currently pass `onForkTree` to any view components — the page is a custom hand-rolled list, not using the three card views. The fork action is not wired here. However, `tree.parent_tree_id` is already rendered (line ~283), so we just need to add a `ForkModal` trigger for any fork buttons that may be present.

**Step 1: Read the MyTreesPage fork section carefully**

Read lines 200–300 of `frontend/src/pages/MyTreesPage.tsx` to understand the exact current fork UI and whether there's a fork button.

```bash
sed -n '200,300p' /home/michaelchihlas/dev/patherly/frontend/src/pages/MyTreesPage.tsx
```

**Step 2: Add import for `ForkModal`**

Add to the imports:
```tsx
import { ForkModal } from '@/components/library/ForkModal'
```

**Step 3: Add fork modal state**

Find the state declarations section. Add:
```tsx
  const [forkTarget, setForkTarget] = useState<TreeListItem | null>(null)
```

**Step 4: Add a "Fork" button to each tree row (if not already present)**

In the tree list rendering, find the action buttons area for each tree (look for the edit/delete buttons). Add a Fork button next to them:

```tsx
<button
  type="button"
  onClick={() => setForkTarget(tree)}
  className="rounded-md border border-border p-2 text-muted-foreground hover:bg-accent hover:text-foreground"
  title="Fork flow"
>
  <GitBranch className="h-4 w-4" />
</button>
```

Note: `GitBranch` is already imported in `MyTreesPage` (line 3).

**Step 5: Add `ForkModal` to JSX**

Find the end of the return statement. Before the root closing tag, add:
```tsx
      {forkTarget && (
        <ForkModal
          treeId={forkTarget.id}
          treeName={forkTarget.name}
          onClose={() => setForkTarget(null)}
        />
      )}
```

**Step 6: Verify TypeScript compiles cleanly**

```bash
cd /home/michaelchihlas/dev/patherly/frontend && npm run build 2>&1 | tail -20
```

Expected: Clean build, no errors.

**Step 7: Commit**

```bash
cd /home/michaelchihlas/dev/patherly
git add frontend/src/pages/MyTreesPage.tsx
git commit -m "feat: add ForkModal to MyTreesPage

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>"
```

---

### Task 5: Add "Fork" chip badge to all three card views

**Files:**
- Modify: `frontend/src/components/library/TreeGridView.tsx`
- Modify: `frontend/src/components/library/TreeListView.tsx`
- Modify: `frontend/src/components/library/TreeTableView.tsx`

Show a small violet chip when `tree.fork_depth > 0` (or `tree.parent_tree_id` is set). Place it near the tree name or alongside other metadata chips.

**Step 1: Add Fork chip to `TreeGridView`**

Read `frontend/src/components/library/TreeGridView.tsx` lines 60–100 to find where tree name and category badge are rendered.

In the name/header area of each card (near where `tree.category_info` chip is rendered), add:

```tsx
{(tree.fork_depth ?? 0) > 0 && (
  <span className="shrink-0 rounded-full bg-violet-400/15 px-1.5 py-0.5 text-[9px] font-semibold uppercase tracking-wide text-violet-400">
    Fork
  </span>
)}
```

Place this chip alongside or just after the tree name `<span>`, or next to the category badge — wherever fits the card layout (read the file to confirm exact placement).

**Step 2: Add Fork chip to `TreeListView`**

Read `frontend/src/components/library/TreeListView.tsx` lines 60–130 to find the name + metadata row.

Add the same chip in the same relative position:

```tsx
{(tree.fork_depth ?? 0) > 0 && (
  <span className="shrink-0 rounded-full bg-violet-400/15 px-1.5 py-0.5 text-[9px] font-semibold uppercase tracking-wide text-violet-400">
    Fork
  </span>
)}
```

**Step 3: Add Fork chip to `TreeTableView`**

Read `frontend/src/components/library/TreeTableView.tsx` lines 80–150 to find the name column cell.

Add the same chip inline after the tree name in the name column:

```tsx
{(tree.fork_depth ?? 0) > 0 && (
  <span className="shrink-0 rounded-full bg-violet-400/15 px-1.5 py-0.5 text-[9px] font-semibold uppercase tracking-wide text-violet-400">
    Fork
  </span>
)}
```

**Step 4: Verify TypeScript compiles cleanly**

```bash
cd /home/michaelchihlas/dev/patherly/frontend && npm run build 2>&1 | tail -20
```

Expected: Clean build, no errors.

**Step 5: Commit**

```bash
cd /home/michaelchihlas/dev/patherly
git add frontend/src/components/library/TreeGridView.tsx \
        frontend/src/components/library/TreeListView.tsx \
        frontend/src/components/library/TreeTableView.tsx
git commit -m "feat: show Fork chip badge on forked tree cards

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>"
```

---

## Manual Verification Checklist

After all tasks are complete:

1. **Fork flow (Library):** Go to Flow Library → click GitBranch icon on any published flow → `ForkModal` opens with name pre-filled as "Copy of <name>" → enter a reason → click "Fork Flow" → toast appears → redirected to My Trees.

2. **Fork flow (My Trees):** Go to My Trees → find a flow → click Fork button → same modal + behavior.

3. **Fork badge:** Fork a flow → go to My Trees → forked flow shows violet "Fork" chip in card header.

4. **Badge in Library views:** In Flow Library, switch to grid/list/table view — forked flows (your own) show "Fork" chip.

5. **Reason is optional:** Fork a flow without entering a reason → still works.

6. **Cancel:** Open ForkModal → click Cancel → modal closes, nothing forked.