feat(plan5): API GET /api/creation/metafields (TDD)

src/app/api/creation/metafields/route.test.ts

@@ -0,0 +1,37 @@
+import { GET } from './route'
+import * as shopifyMetafields from '@/lib/shopifyMetafields'
+import { getServerSession } from 'next-auth'
+
+jest.mock('next-auth')
+jest.mock('@/lib/shopifyMetafields')
+
+const mockSession = getServerSession as jest.MockedFunction<typeof getServerSession>
+const mockFetchDefs = shopifyMetafields.fetchMetafieldDefinitions as jest.MockedFunction<typeof shopifyMetafields.fetchMetafieldDefinitions>
+const mockMatch = shopifyMetafields.matchMetafields as jest.MockedFunction<typeof shopifyMetafields.matchMetafields>
+
+describe('GET /api/creation/metafields', () => {
+  beforeEach(() => {
+    mockSession.mockResolvedValue({ user: { id: 'u1', role: 'admin' } } as never)
+    mockFetchDefs.mockResolvedValue([
+      { id: '1', namespace: 'custom', key: 'puissance', name: 'Puissance', type: 'single_line_text_field' },
+    ])
+    mockMatch.mockReturnValue({
+      matched: { 'Puissance (AN)': { columnHeader: 'Puissance (AN)', action: 'map', namespace: 'custom', key: 'puissance', existingDefinitionId: '1' } },
+      unmatched: ['Batterie (AP)'],
+    })
+  })
+
+  it('retourne 401 sans session', async () => {
+    mockSession.mockResolvedValue(null)
+    const res = await GET(new Request('http://localhost/api/creation/metafields?columns=Puissance') as never)
+    expect(res.status).toBe(401)
+  })
+
+  it('retourne définitions + matching', async () => {
+    const res = await GET(new Request('http://localhost/api/creation/metafields?columns=Puissance+%28AN%29%2CBatterie+%28AP%29') as never)
+    const body = await res.json()
+    expect(body.definitions).toHaveLength(1)
+    expect(body.matched['Puissance (AN)'].key).toBe('puissance')
+    expect(body.unmatched).toContain('Batterie (AP)')
+  })
+})

src/app/api/creation/metafields/route.ts

@@ -0,0 +1,20 @@
+import { NextRequest, NextResponse } from 'next/server'
+import { getServerSession } from 'next-auth'
+import { authOptions } from '@/lib/auth'
+import { fetchMetafieldDefinitions, matchMetafields } from '@/lib/shopifyMetafields'
+
+export async function GET(req: NextRequest) {
+  const session = await getServerSession(authOptions)
+  if (!session) return NextResponse.json({ error: 'Non authentifié' }, { status: 401 })
+  try {
+    const { searchParams } = new URL(req.url)
+    const columnsParam = searchParams.get('columns') ?? ''
+    const columns = columnsParam ? columnsParam.split(',').map(c => c.trim()).filter(Boolean) : []
+    const definitions = await fetchMetafieldDefinitions()
+    const { matched, unmatched } = matchMetafields(columns, definitions)
+    return NextResponse.json({ definitions, matched, unmatched })
+  } catch (err) {
+    const message = err instanceof Error ? err.message : 'Erreur inconnue'
+    return NextResponse.json({ error: message }, { status: 500 })
+  }
+}