/**
 * TaskState wire-format enum. SCREAMING_SNAKE_CASE per parent plan.
 *
 * Authoritative enum values match the A2A spec's TaskState proto enum
 * literal naming. The `toSeshOps()` Go-enum mirror is deferred to whichever
 * slice first carries a TaskState on the wire (Slice 3 or 4) so the
 * mapping doesn't drift before any caller validates it.
 */

export type TaskStateWire =
  | "TASK_STATE_SUBMITTED"
  | "TASK_STATE_WORKING"
  | "TASK_STATE_INPUT_REQUIRED"
  | "TASK_STATE_AUTH_REQUIRED"
  | "TASK_STATE_COMPLETED"
  | "TASK_STATE_CANCELED"
  | "TASK_STATE_FAILED"
  | "TASK_STATE_REJECTED"
  | "TASK_STATE_UNSPECIFIED";

const TERMINAL: ReadonlySet<TaskStateWire> = new Set<TaskStateWire>([
  "TASK_STATE_COMPLETED",
  "TASK_STATE_CANCELED",
  "TASK_STATE_FAILED",
  "TASK_STATE_REJECTED",
]);

/** Returns true if the state is terminal (no further transitions expected). */
export function isTerminal(state: TaskStateWire): boolean {
  return TERMINAL.has(state);
}