import * as getPort from 'get-port';
import { App, Bot, segment, Session } from 'koishi';
import 'koishi-adapter-onebot';

import { parseCmd, query, view } from './command';
import { getLogger } from './loggers';

const logger = getLogger('qqbot');

interface IQQProps {
  access_token: string;
  host: string;
  port: number;
  bot_id: number;
  list(chat: IChat, args: string[], replyfn: (msg: string) => any): void;
  sub(chat: IChat, args: string[], replyfn: (msg: string) => any): void;
  unsub(chat: IChat, args: string[], replyfn: (msg: string) => any): void;
}

export const message = segment;
export const ellipseBase64InMessage = (msg: string) => msg.replace(/(?<=\[CQ:.*base64:\/\/).*?(,|\])/, '...$1');

export default class {

  private botInfo: IQQProps;
  private app: App;
  public bot: Bot;

  private getChat = async (session: Session): Promise<IChat> => {
    switch (session.subtype) {
      case 'private':
        if (session.groupId) { // temp message
          const friendList = await session.bot.getFriendList();
          if (!friendList.some(friendItem => friendItem.userId === session.userId)) {
            return {
              chatID: {
                qq: Number(session.userId),
                group: Number(session.groupId),
              },
              chatType: ChatType.Temp,
            };
          }
        }
        return { // already befriended
          chatID: Number(session.userId),
          chatType: ChatType.Private,
        };
      case 'group':
        return {
          chatID: Number(session.groupId),
          chatType: ChatType.Group,
        };
    }
  };

  public sendTo = (subscriber: IChat, msg: string) => (() => {
    switch (subscriber.chatType) {
      case 'group':
        return this.bot.sendMessage(subscriber.chatID.toString(), msg);
      case 'private':
        return this.bot.sendPrivateMessage(subscriber.chatID.toString(), msg);
      case 'temp': // currently unable to open session, awaiting OneBot v12
        return this.bot.sendPrivateMessage(subscriber.chatID.qq.toString(), msg);
    }
  })()
    .then(response => {
      logger.info(`pushing data to ${JSON.stringify(subscriber.chatID)} was successful, response:`);
      logger.info(response);
    })
    .catch(reason => {
      logger.error(`error pushing data to ${JSON.stringify(subscriber.chatID)}, reason: ${reason}`);
      throw Error(reason);
    });

  private initBot = async () => {
    const port = await getPort();

    this.app = new App({
      type: 'onebot',
      port,
      server: `http://${this.botInfo.host}:${this.botInfo.port}`,
      selfId: this.botInfo.bot_id.toString(),
      token: this.botInfo.access_token,
      onebot: {
        quickOperation: 100,
      },
      axiosConfig: {
        maxContentLength: Infinity,
      },
      processMessage: msg => msg.trim(),
    });

    this.app.on('friend-request', async session => {
      const userString = `${session.username}(${session.userId})`;
      const groupString = `${session.groupName}(${session.groupId})`;
      logger.debug(`detected new friend request event: ${userString}`);
      return session.bot.getGroupList().then(groupList => {
        if (groupList.some(groupItem => groupItem.groupId === session.groupId)) {
          session.bot.handleFriendRequest(session.messageId, true);
          return logger.info(`accepted friend request from ${userString} (from group ${groupString})`);
        }
        logger.warn(`received friend request from ${userString} (from group ${groupString})`);
        logger.warn('please manually accept this friend request');
      });
    });

    this.app.on('group-request', async session => {
      const userString = `${session.username}(${session.userId})`;
      const groupString = `${session.groupName}(${session.groupId})`;
      logger.debug(`detected group invitation event: ${groupString}}`);
      return session.bot.getFriendList().then(friendList => {
        if (friendList.some(friendItem => friendItem.userId = session.userId)) {
          session.bot.handleGroupRequest(session.messageId, true);
          return logger.info(`accepted group invitation from ${userString} (friend)`);
        }
        logger.warn(`received group invitation from ${userString} (stranger)`);
        logger.warn('please manually accept this group invitation');
      });
    });

    this.app.middleware(async session => {
      const chat = await this.getChat(session);
      const cmdObj = parseCmd(session.content);
      const reply = async msg => session.send(msg);
      switch (cmdObj.cmd) {
        case 'twitter_view':
        case 'twitter_get':
          view(chat, cmdObj.args, reply);
          break;
        case 'twitter_query':
        case 'twitter_gettimeline':
          query(chat, cmdObj.args, reply);
          break;
        case 'twitter_sub':
        case 'twitter_subscribe':
          this.botInfo.sub(chat, cmdObj.args, reply);
          break;
        case 'twitter_unsub':
        case 'twitter_unsubscribe':
          this.botInfo.unsub(chat, cmdObj.args, reply);
          break;
        case 'ping':
        case 'twitter':
          this.botInfo.list(chat, cmdObj.args, reply);
          break;
        case 'help':
          if (cmdObj.args.length === 0) {
            reply(`推特搬运机器人：
/twitter - 查询当前聊天中的推文订阅
/twitter_subscribe〈链接|用户名〉- 订阅 Twitter 推文搬运
/twitter_unsubscribe〈链接|用户名〉- 退订 Twitter 推文搬运
/twitter_view〈链接〉- 查看推文
/twitter_query〈链接|用户名〉[参数列表...] - 查询时间线（详见 /help twitter_query）\
${chat.chatType === ChatType.Temp ?
    '\n（当前游客模式下无法使用订阅功能，请先添加本账号为好友。）' : ''
}`);
          } else if (cmdObj.args[0] === 'twitter_query') {
            reply(`查询时间线中的推文：
/twitter_query〈链接|用户名〉[〈参数 1〉=〈值 1〉〈参数 2〉=〈值 2〉...]

参数列表（方框内全部为可选，留空则为默认）：
    count：查询数量上限（类型：非零整数，最大值正负 50）[默认值：10]
    since：查询起始点（类型：正整数或日期）[默认值：（空，无限过去）]
    until：查询结束点（类型：正整数或日期）[默认值：（空，当前时刻）]
    noreps 忽略回复推文（类型：on/off）[默认值：on（是）]
    norts：忽略原生转推（类型：on/off）[默认值：off（否）]`)
              .then(() => reply(`\
起始点和结束点为正整数时取推特推文编号作为比较基准，否则会尝试作为日期读取。
推荐的日期格式：2012-12-22 12:22 UTC+2 （日期和时间均为可选，可分别添加）
count 为正时，从新向旧查询；为负时，从旧向新查询
count 与 since/until 并用时，取二者中实际查询结果较少者
例子：/twitter_query RiccaTachibana count=5 since="2019-12-30\
 UTC+9" until="2020-01-06 UTC+8" norts=on
    从起始时间点（含）到结束时间点（不含）从新到旧获取最多 5 条推文，\
其中不包含原生转推（实际上用户只发了 1 条）`)
              );
          }
      }
    });
  };

  public connect = async () => {
    await this.initBot();
    await this.app.start();
    this.bot = this.app.getBot('onebot');
  };

  constructor(opt: IQQProps) {
    logger.warn(`Initialized koishi on ${opt.host}:${opt.port} with access_token ${opt.access_token}`);
    this.botInfo = opt;
  }
}