import type { InboxDocument, InboxModel } from '../../../models/chat/inbox';
import {
  TcService,
  TcContext,
  TcDbService,
  TcPureContext,
  InboxStruct,
} from 'tailchat-server-sdk';

/**
 * 收件箱管理
 */
interface InboxService
  extends TcService,
    TcDbService<InboxDocument, InboxModel> {}
class InboxService extends TcService {
  get serviceName(): string {
    return 'chat.inbox';
  }

  onInit(): void {
    this.registerLocalDb(require('../../../models/chat/inbox').default);

    this.registerEventListener(
      'chat.message.updateMessage',
      async (payload, ctx) => {
        if (
          Array.isArray(payload.meta.mentions) &&
          payload.meta.mentions.length > 0
        ) {
          const mentions = payload.meta.mentions;
          if (payload.type === 'add') {
            await Promise.all(
              mentions.map((userId) => {
                return ctx.call('chat.inbox.append', {
                  userId,
                  type: 'message',
                  payload: {
                    groupId: payload.groupId,
                    converseId: payload.converseId,
                    messageId: payload.messageId,
                    messageAuthor: payload.author,
                    messageSnippet: payload.content,
                    messagePlainContent: payload.plain,
                  },
                });
              })
            );
          } else if (payload.type === 'delete') {
            await Promise.all(
              mentions.map((userId) => {
                return ctx.call('chat.inbox.removeMessage', {
                  userId,
                  groupId: payload.groupId,
                  converseId: payload.converseId,
                  messageId: payload.messageId,
                });
              })
            );
          }
        }
      }
    );

    this.registerAction('append', this.append, {
      visibility: 'public',
      params: {
        userId: { type: 'string', optional: true },
        type: 'string',
        payload: 'any',
      },
    });
    this.registerAction('removeMessage', this.removeMessage, {
      visibility: 'public',
      params: {
        userId: { type: 'string', optional: true },
        groupId: { type: 'string', optional: true },
        converseId: 'string',
        messageId: 'string',
      },
    });
    this.registerAction('all', this.all);
    this.registerAction('ack', this.ack, {
      params: {
        inboxItemIds: { type: 'array', items: 'string' },
      },
    });
    this.registerAction('clear', this.clear);
  }

  /**
   * 通用的增加inbox的接口
   * 用于内部，插件化的形式
   */
  async append(
    ctx: TcContext<{
      userId?: string;
      type: string;
      payload: Record<string, any>;
    }>
  ) {
    const { userId = ctx.meta.userId, type, payload } = ctx.params;

    const doc = await this.adapter.model.create({
      userId,
      type,
      payload,
    });

    const inboxItem = await this.transformDocuments(ctx, {}, doc);

    await this.notifyUsersInboxAppend(ctx, [userId], inboxItem);
    await this.emitInboxAppendEvent(ctx, inboxItem);

    return true;
  }

  async removeMessage(
    ctx: TcContext<{
      userId?: string;
      groupId?: string;
      converseId: string;
      messageId: string;
    }>
  ) {
    const {
      userId = ctx.meta.userId,
      groupId,
      converseId,
      messageId,
    } = ctx.params;

    await this.adapter.model.remove({
      userId,
      type: 'message',
      payload: {
        groupId,
        converseId,
        messageId,
      },
    });

    await this.notifyUsersInboxUpdate(ctx, [userId]); // not good, 后面最好修改为发送删除的项而不是所有

    return true;
  }

  /**
   * 获取用户收件箱中所有内容
   */
  async all(ctx: TcContext<{}>) {
    const userId = ctx.meta.userId;

    const list = await this.adapter.model.find({
      userId,
    });

    return await this.transformDocuments(ctx, {}, list);
  }

  /**
   * 标记收件箱内容已读
   */
  async ack(ctx: TcContext<{ inboxItemIds: string[] }>) {
    const inboxItemIds = ctx.params.inboxItemIds;
    const userId = ctx.meta.userId;

    await this.adapter.model.updateMany(
      {
        _id: {
          $in: [...inboxItemIds],
        },
        userId,
      },
      {
        readed: true,
      }
    );

    return true;
  }

  /**
   * 清空所有的收件箱内容
   */
  async clear(ctx: TcContext) {
    const userId = ctx.meta.userId;

    await this.adapter.model.deleteMany({
      userId,
    });

    await this.notifyUsersInboxUpdate(ctx, [userId]);

    return true;
  }

  /**
   * 通知用户收件箱追加了新的内容
   */
  private async notifyUsersInboxAppend(
    ctx: TcPureContext,
    userIds: string[],
    data: any
  ): Promise<void> {
    await this.listcastNotify(ctx, userIds, 'append', { ...data });
  }

  /**
   * 通知用户收件箱有新的内容
   */
  private async notifyUsersInboxUpdate(
    ctx: TcPureContext,
    userIds: string[]
  ): Promise<void> {
    await this.listcastNotify(ctx, userIds, 'updated', {});
  }

  /**
   * 向微服务通知有新的内容产生
   */
  private async emitInboxAppendEvent(
    ctx: TcPureContext,
    inboxItem: InboxStruct
  ) {
    await ctx.emit('chat.inbox.append', inboxItem);
  }
}

export default InboxService;
