feat: establish facade-first runtime boundary

src/facade/mockFacade.ts

@@ -0,0 +1,71 @@
+import { workbenchDefinitions, type WorkbenchId } from '../freecadManifest'
+import type {
+  BitBybitWebCadFacade,
+  CommandState,
+  DocumentSnapshot,
+  ExecuteCommandInput,
+  FacadeEvent,
+  FacadeListener,
+  FacadeState,
+  ModelTreeItem,
+  TaskSnapshot,
+  Unsubscribe,
+} from './types'
+import { ThreeViewportAdapter } from './threeViewport'
+
+const initialTree: ModelTreeItem[] = [
+  { id: 'origin', label: 'Origin', type: 'folder', children: ['XY_Plane', 'XZ_Plane', 'YZ_Plane'] },
+  { id: 'body', label: 'Body', type: 'body', state: 'active', children: ['sketch', 'pad', 'pocket', 'fillet'] },
+  { id: 'sketch', label: 'Sketch', type: 'sketch', state: 'valid', detail: 'Fully constrained' },
+  { id: 'pad', label: 'Pad', type: 'feature', state: 'valid', detail: 'Length 42 mm' },
+  { id: 'pocket', label: 'Pocket', type: 'feature', state: 'warning', detail: 'Through all' },
+  { id: 'fillet', label: 'Fillet', type: 'feature', state: 'valid', detail: 'Radius 3 mm' },
+  { id: 'reference', label: 'Reference geometry', type: 'folder', children: ['DatumPlane', 'DatumAxis'] },
+]
+
+const createDocument = (label = 'Pump Housing'): DocumentSnapshot => ({
+  id: 'doc-pump-housing', label, version: 18, dirty: true, readOnly: false, units: 'mm', tree: initialTree.map((item) => ({ ...item, children: item.children ? [...item.children] : undefined })),
+})
+
+const commandState = (commandId: string, activeWorkbench: WorkbenchId): CommandState => {
+  const known = Object.values(workbenchDefinitions).some((definition) => definition.groups.some((group) => group.commands.some((command) => command.id === commandId)))
+  if (!known) return { id: commandId, status: 'disabled', reason: 'Command is not registered in the active manifest.' }
+  if (commandId === 'pad' && activeWorkbench !== 'Part Design') return { id: commandId, status: 'disabled', reason: 'Switch to Part Design to use Pad.' }
+  return { id: commandId, status: 'enabled' }
+}
+
+export function createMockFacade(): BitBybitWebCadFacade {
+  let state: FacadeState = { apiVersion: '0.1', activeWorkbench: 'Part Design', selectedObjectId: 'pad', document: createDocument(), task: null, lastNotice: '' }
+  const listeners = new Set<FacadeListener>()
+  let requestSequence = 0
+
+  const emit = (event: FacadeEvent) => listeners.forEach((listener) => listener(event))
+  const emitState = () => emit({ type: 'state.changed', state: getState() })
+  const getState = () => ({ ...state, document: { ...state.document, tree: state.document.tree.map((item) => ({ ...item, children: item.children ? [...item.children] : undefined })) }, task: state.task ? { ...state.task, draft: { ...state.task.draft } } : null })
+  const notify = (message: string) => { state = { ...state, lastNotice: message }; emit({ type: 'notice', message }); emitState() }
+  const setActive = (id: WorkbenchId) => { state = { ...state, activeWorkbench: id }; emitState(); notify(`${id} workbench loaded`) }
+  const select = (objectId: string) => { state = { ...state, selectedObjectId: objectId }; emitState() }
+  const beginTask = (commandId: string, draft: Record<string, unknown> = {}) => { const task: TaskSnapshot = { id: `task-${++requestSequence}`, commandId, title: workbenchDefinitions[state.activeWorkbench].taskTitle, status: 'preview', draft }; state = { ...state, task }; emitState(); return task }
+  const execute = ({ commandId, payload }: ExecuteCommandInput) => {
+    const requestId = `req-${++requestSequence}`
+    const status = commandState(commandId, state.activeWorkbench)
+    if (status.status === 'disabled') { emit({ type: 'command.failed', commandId, requestId, message: status.reason }); notify(status.reason || 'Command is disabled'); return requestId }
+    emit({ type: 'command.started', commandId, requestId })
+    if (commandId === 'new-document') state = { ...state, document: createDocument('Untitled document') }
+    else if (commandId === 'save') state = { ...state, document: { ...state.document, dirty: false, version: state.document.version + 1 } }
+    else if (commandId === 'select-object' && typeof payload?.objectId === 'string') select(payload.objectId)
+    else if (commandId === 'create-body') beginTask('create-body')
+    else if (commandId === 'create-sketch') beginTask('create-sketch')
+    emit({ type: 'command.completed', commandId, requestId }); emitState(); return requestId
+  }
+
+  const facade: BitBybitWebCadFacade = {
+    app: { document: { getActive: () => getState().document, create: (label) => { state = { ...state, document: createDocument(label), selectedObjectId: '' }; emitState(); return getState().document }, markDirty: () => { state = { ...state, document: { ...state.document, dirty: true } }; emitState() } } },
+    gui: { workbench: { list: () => Object.keys(workbenchDefinitions) as WorkbenchId[], getActive: () => state.activeWorkbench, setActive }, command: { getState: (commandId) => commandState(commandId, state.activeWorkbench), list: (workbench) => workbenchDefinitions[workbench].groups.flatMap((group) => group.commands), execute } },
+    selection: { getObjectId: () => state.selectedObjectId, select, clear: () => select('') },
+    task: { getActive: () => getState().task, begin: beginTask, update: (draft) => { if (state.task) state = { ...state, task: { ...state.task, draft: { ...state.task.draft, ...draft } } }; emitState() }, apply: () => { if (state.task) state = { ...state, task: { ...state.task, status: 'completed' } }; emitState() }, cancel: () => { if (state.task) state = { ...state, task: { ...state.task, status: 'cancelled' } }; emitState() } },
+    viewport: { createAdapter: () => new ThreeViewportAdapter() },
+    getState, subscribe: (listener) => { listeners.add(listener); return () => { listeners.delete(listener) } }, notify,
+  }
+  return facade
+}