export type PendingCanvasAgentSlotFillRequest = {
  nodeId?: string;
  label?: string;
};

export type PendingCanvasAgentAnnotationEditRequest = {
  nodeId?: string;
  title?: string;
  annotationCount?: number;
};

export type CanvasAgentPendingRequestWindow = Window & {
  __canvasAgentPendingSlotFillRequest?: PendingCanvasAgentSlotFillRequest;
  __canvasAgentPendingAnnotationEditRequest?: PendingCanvasAgentAnnotationEditRequest;
};

export const CANVAS_AGENT_OPEN_CHAT_PANEL_EVENT = "canvas-open-chat-panel-request";
export const CANVAS_AGENT_SLOT_FILL_EVENT = "canvas-agent-slot-fill-request";
export const CANVAS_AGENT_ANNOTATION_EDIT_EVENT =
  "canvas-agent-annotation-edit-request";

function normalizeNodeId(value: unknown) {
  return String(value || "").trim();
}

function shouldConsumePendingRequest(params: {
  pendingNodeId?: string;
  detailNodeId?: string;
  hasDetail: boolean;
}) {
  const pendingNodeId = normalizeNodeId(params.pendingNodeId);
  const detailNodeId = normalizeNodeId(params.detailNodeId);
  return !params.hasDetail || !pendingNodeId || pendingNodeId === detailNodeId;
}

export function storeCanvasAgentSlotFillRequest(
  targetWindow: CanvasAgentPendingRequestWindow,
  request: PendingCanvasAgentSlotFillRequest
) {
  targetWindow.__canvasAgentPendingSlotFillRequest = { ...request };
}

export function getPendingCanvasAgentSlotFillRequest(
  targetWindow: CanvasAgentPendingRequestWindow
) {
  return targetWindow.__canvasAgentPendingSlotFillRequest || null;
}

export function consumeCanvasAgentSlotFillRequest(
  targetWindow: CanvasAgentPendingRequestWindow,
  detail?: PendingCanvasAgentSlotFillRequest | null
) {
  const pending = getPendingCanvasAgentSlotFillRequest(targetWindow);
  if (!pending) return null;
  if (
    shouldConsumePendingRequest({
      pendingNodeId: pending.nodeId,
      detailNodeId: detail?.nodeId,
      hasDetail: Boolean(detail),
    })
  ) {
    delete targetWindow.__canvasAgentPendingSlotFillRequest;
  }
  return pending;
}

export function storeCanvasAgentAnnotationEditRequest(
  targetWindow: CanvasAgentPendingRequestWindow,
  request: PendingCanvasAgentAnnotationEditRequest
) {
  targetWindow.__canvasAgentPendingAnnotationEditRequest = { ...request };
}

export function getPendingCanvasAgentAnnotationEditRequest(
  targetWindow: CanvasAgentPendingRequestWindow
) {
  return targetWindow.__canvasAgentPendingAnnotationEditRequest || null;
}

export function consumeCanvasAgentAnnotationEditRequest(
  targetWindow: CanvasAgentPendingRequestWindow,
  detail?: PendingCanvasAgentAnnotationEditRequest | null
) {
  const pending = getPendingCanvasAgentAnnotationEditRequest(targetWindow);
  if (!pending) return null;
  if (
    shouldConsumePendingRequest({
      pendingNodeId: pending.nodeId,
      detailNodeId: detail?.nodeId,
      hasDetail: Boolean(detail),
    })
  ) {
    delete targetWindow.__canvasAgentPendingAnnotationEditRequest;
  }
  return pending;
}

export function dispatchCanvasAgentOpenChatPanelRequest(
  targetWindow: Window,
  detail: { reason: "agent-slot-fill" | "agent-annotation-edit"; nodeId?: string }
) {
  targetWindow.dispatchEvent(
    new CustomEvent(CANVAS_AGENT_OPEN_CHAT_PANEL_EVENT, { detail })
  );
}

export function dispatchCanvasAgentSlotFillRequest(
  targetWindow: Window,
  detail: PendingCanvasAgentSlotFillRequest
) {
  targetWindow.dispatchEvent(new CustomEvent(CANVAS_AGENT_SLOT_FILL_EVENT, { detail }));
}

export function dispatchCanvasAgentAnnotationEditRequest(
  targetWindow: Window,
  detail: PendingCanvasAgentAnnotationEditRequest
) {
  targetWindow.dispatchEvent(
    new CustomEvent(CANVAS_AGENT_ANNOTATION_EDIT_EVENT, { detail })
  );
}