import { ApiError, type XgridsK1State } from "./api";

export interface ExactApplicationControlCas {
  expected_session_generation: number;
  expected_state_revision: number;
}

export interface ExactAcquisitionControlCas {
  expected_control_session_generation: number;
  expected_control_state_revision: number;
}

interface ControlSessionVersion {
  sessionGeneration: number;
  stateRevision: number;
}

function exactControlSessionVersion(
  state: XgridsK1State | null | undefined,
  actionLabel: string,
): ControlSessionVersion {
  const session = state?.application_control_session;
  const sessionGeneration = session?.session_generation;
  const stateRevision = session?.state_revision;
  if (
    !Number.isSafeInteger(sessionGeneration)
    || (sessionGeneration ?? -1) < 0
    || !Number.isSafeInteger(stateRevision)
    || (stateRevision ?? -1) < 0
  ) {
    throw new ApiError(
      `Команда ${actionLabel} не отправлена: последнее принятое состояние не содержит целые session_generation и state_revision управляющей сессии. Обновите состояние K1 и повторите отдельным действием.`,
    );
  }
  return {
    sessionGeneration: sessionGeneration as number,
    stateRevision: stateRevision as number,
  };
}

export function exactApplicationControlCas(
  latestAcceptedState: XgridsK1State | null | undefined,
  actionLabel: string,
): ExactApplicationControlCas {
  const version = exactControlSessionVersion(latestAcceptedState, actionLabel);
  return {
    expected_session_generation: version.sessionGeneration,
    expected_state_revision: version.stateRevision,
  };
}

export function exactAcquisitionControlCas(
  latestAcceptedState: XgridsK1State | null | undefined,
  actionLabel: string,
): ExactAcquisitionControlCas {
  const version = exactControlSessionVersion(latestAcceptedState, actionLabel);
  return {
    expected_control_session_generation: version.sessionGeneration,
    expected_control_state_revision: version.stateRevision,
  };
}

export function acquisitionMutationUsesControlSession(
  latestAcceptedState: XgridsK1State | null | undefined,
): boolean {
  const session = latestAcceptedState?.application_control_session;
  return Boolean(
    session
    && session.mode === "interactive-canonical"
    && !["idle", "closed", "completed"].includes(session.state),
  );
}