/**
 * iframe 与宿主页通信消息类型常量
 *
 * 消息格式：{ type: MESSAGE_TYPE, ...其他字段 }
 * 发送方式：window.parent.postMessage(message, "*")
 */

// 发送给宿主页的消息类型
export const POST_MESSAGE_TYPES = {
  // 全屏切换
  FULLSCREEN: "fullscreen",
  // 会话是否处于聊天态
  IS_CHATTING: "isChatting",
  // 选择预定义 skill
  SELECT_SKILL: "selectSkill",
  // 打开 skill 选择对话框
  OPEN_SKILL_DIALOG: "openSkillDialog",
} as const;

// 接收来自宿主页的消息类型
export const RECEIVE_MESSAGE_TYPES = {
  // 选中的 skill 数据
  SELECTED_SKILL: "selectedSkill",
} as const;

// 消息类型
export type PostMessageType =
  (typeof POST_MESSAGE_TYPES)[keyof typeof POST_MESSAGE_TYPES];
export type ReceiveMessageType =
  (typeof RECEIVE_MESSAGE_TYPES)[keyof typeof RECEIVE_MESSAGE_TYPES];

// 消息数据类型
export interface FullscreenMessage {
  type: typeof POST_MESSAGE_TYPES.FULLSCREEN;
  fullscreen: boolean;
}

export interface IsChattingMessage {
  type: typeof POST_MESSAGE_TYPES.IS_CHATTING;
  isChatting: boolean;
}

export interface SelectSkillMessage {
  type: typeof POST_MESSAGE_TYPES.SELECT_SKILL;
  skill_id: string[];
}

export interface OpenSkillDialogMessage {
  type: typeof POST_MESSAGE_TYPES.OPEN_SKILL_DIALOG;
  openSkillDialog: true;
}

export interface SelectedSkillMessage {
  type: typeof RECEIVE_MESSAGE_TYPES.SELECTED_SKILL;
  id: string | number;
  title: string;
}

type UnknownRecord = Record<string, unknown>;

function asRecord(value: unknown): UnknownRecord | null {
  if (typeof value !== "object" || value === null) {
    return null;
  }
  return value as UnknownRecord;
}

export function isSelectedSkillMessage(value: unknown): value is SelectedSkillMessage {
  const record = asRecord(value);
  if (record?.type !== RECEIVE_MESSAGE_TYPES.SELECTED_SKILL) {
    return false;
  }
  const { id, title } = record;
  const isValidId = typeof id === "string" || typeof id === "number";
  return isValidId && typeof title === "string" && title.trim().length > 0;
}

// 发送消息的辅助函数
export function sendToParent(
  message:
    | FullscreenMessage
    | IsChattingMessage
    | SelectSkillMessage
    | OpenSkillDialogMessage,
): void {
  console.log("[iframe] sendToParent:", message);
  if (window.parent !== window) {
    window.parent.postMessage(message, "*");
  }
}