init claude-code

state/selectors.ts

@@ -0,0 +1,76 @@
+/**
+ * Selectors for deriving computed state from AppState.
+ * Keep selectors pure and simple - just data extraction, no side effects.
+ */
+
+import type { InProcessTeammateTaskState } from '../tasks/InProcessTeammateTask/types.js'
+import { isInProcessTeammateTask } from '../tasks/InProcessTeammateTask/types.js'
+import type { LocalAgentTaskState } from '../tasks/LocalAgentTask/LocalAgentTask.js'
+import type { AppState } from './AppStateStore.js'
+
+/**
+ * Get the currently viewed teammate task, if any.
+ * Returns undefined if:
+ * - No teammate is being viewed (viewingAgentTaskId is undefined)
+ * - The task ID doesn't exist in tasks
+ * - The task is not an in-process teammate task
+ */
+export function getViewedTeammateTask(
+  appState: Pick<AppState, 'viewingAgentTaskId' | 'tasks'>,
+): InProcessTeammateTaskState | undefined {
+  const { viewingAgentTaskId, tasks } = appState
+
+  // Not viewing any teammate
+  if (!viewingAgentTaskId) {
+    return undefined
+  }
+
+  // Look up the task
+  const task = tasks[viewingAgentTaskId]
+  if (!task) {
+    return undefined
+  }
+
+  // Verify it's an in-process teammate task
+  if (!isInProcessTeammateTask(task)) {
+    return undefined
+  }
+
+  return task
+}
+
+/**
+ * Return type for getActiveAgentForInput selector.
+ * Discriminated union for type-safe input routing.
+ */
+export type ActiveAgentForInput =
+  | { type: 'leader' }
+  | { type: 'viewed'; task: InProcessTeammateTaskState }
+  | { type: 'named_agent'; task: LocalAgentTaskState }
+
+/**
+ * Determine where user input should be routed.
+ * Returns:
+ * - { type: 'leader' } when not viewing a teammate (input goes to leader)
+ * - { type: 'viewed', task } when viewing an agent (input goes to that agent)
+ *
+ * Used by input routing logic to direct user messages to the correct agent.
+ */
+export function getActiveAgentForInput(
+  appState: AppState,
+): ActiveAgentForInput {
+  const viewedTask = getViewedTeammateTask(appState)
+  if (viewedTask) {
+    return { type: 'viewed', task: viewedTask }
+  }
+
+  const { viewingAgentTaskId, tasks } = appState
+  if (viewingAgentTaskId) {
+    const task = tasks[viewingAgentTaskId]
+    if (task?.type === 'local_agent') {
+      return { type: 'named_agent', task }
+    }
+  }
+
+  return { type: 'leader' }
+}