import type { ResolvedQQBotAccount } from "./types.js";
import { 
  getAccessToken, 
  sendC2CMessage, 
  sendChannelMessage, 
  sendGroupMessage,
  sendProactiveC2CMessage,
  sendProactiveGroupMessage,
} from "./api.js";

export interface OutboundContext {
  to: string;
  text: string;
  accountId?: string | null;
  replyToId?: string | null;
  account: ResolvedQQBotAccount;
}

export interface OutboundResult {
  channel: string;
  messageId?: string;
  timestamp?: string | number;
  error?: string;
}

/**
 * 解析目标地址
 * 格式：
 *   - openid (32位十六进制) -> C2C 单聊
 *   - group:xxx -> 群聊
 *   - channel:xxx -> 频道
 *   - 纯数字 -> 频道
 */
function parseTarget(to: string): { type: "c2c" | "group" | "channel"; id: string } {
  if (to.startsWith("group:")) {
    return { type: "group", id: to.slice(6) };
  }
  if (to.startsWith("channel:")) {
    return { type: "channel", id: to.slice(8) };
  }
  // openid 通常是 32 位十六进制
  if (/^[A-F0-9]{32}$/i.test(to)) {
    return { type: "c2c", id: to };
  }
  // 默认当作频道 ID
  return { type: "channel", id: to };
}

/**
 * 发送文本消息（被动回复，需要 replyToId）
 */
export async function sendText(ctx: OutboundContext): Promise<OutboundResult> {
  const { to, text, replyToId, account } = ctx;

  if (!account.appId || !account.clientSecret) {
    return { channel: "qqbot", error: "QQBot not configured (missing appId or clientSecret)" };
  }

  try {
    const accessToken = await getAccessToken(account.appId, account.clientSecret);
    const target = parseTarget(to);

    if (target.type === "c2c") {
      const result = await sendC2CMessage(accessToken, target.id, text, replyToId ?? undefined);
      return { channel: "qqbot", messageId: result.id, timestamp: result.timestamp };
    } else if (target.type === "group") {
      const result = await sendGroupMessage(accessToken, target.id, text, replyToId ?? undefined);
      return { channel: "qqbot", messageId: result.id, timestamp: result.timestamp };
    } else {
      const result = await sendChannelMessage(accessToken, target.id, text, replyToId ?? undefined);
      return { channel: "qqbot", messageId: result.id, timestamp: result.timestamp };
    }
  } catch (err) {
    const message = err instanceof Error ? err.message : String(err);
    return { channel: "qqbot", error: message };
  }
}

/**
 * 主动发送消息（不需要 replyToId，有配额限制：每月 4 条/用户/群）
 * 
 * @param account - 账户配置
 * @param to - 目标地址，格式：openid（单聊）或 group:xxx（群聊）
 * @param text - 消息内容
 */
export async function sendProactiveMessage(
  account: ResolvedQQBotAccount,
  to: string,
  text: string
): Promise<OutboundResult> {
  if (!account.appId || !account.clientSecret) {
    return { channel: "qqbot", error: "QQBot not configured (missing appId or clientSecret)" };
  }

  try {
    const accessToken = await getAccessToken(account.appId, account.clientSecret);
    const target = parseTarget(to);

    if (target.type === "c2c") {
      const result = await sendProactiveC2CMessage(accessToken, target.id, text);
      return { channel: "qqbot", messageId: result.id, timestamp: result.timestamp };
    } else if (target.type === "group") {
      const result = await sendProactiveGroupMessage(accessToken, target.id, text);
      return { channel: "qqbot", messageId: result.id, timestamp: result.timestamp };
    } else {
      // 频道暂不支持主动消息，使用普通发送
      const result = await sendChannelMessage(accessToken, target.id, text);
      return { channel: "qqbot", messageId: result.id, timestamp: result.timestamp };
    }
  } catch (err) {
    const message = err instanceof Error ? err.message : String(err);
    return { channel: "qqbot", error: message };
  }
}