/**
 * Milky Webhook Bot：无长连接，在 router.post(path) 接收 POST 事件，鉴权后转 Message
 */
import { EventEmitter } from 'events';
import { formatCompact, Endpoint, Message, segment, SendOptions,} from 'zhin.js';
import { firstHeader, firstQuery, registerFetchRoute, type Router, type RouterContext } from '@zhin.js/host-router/router';
import { callApi } from './api.js';
import type { MilkyWebhookConfig, MilkyEvent } from './types.js';
import type { MilkyAdapter } from './adapter.js';
import {
  formatMilkyMessagePayload,
  parseMessageReceiveData,
  toMilkyOutgoingSegments,
  parseMilkyMessageId,
} from './utils.js';

function getAccessTokenFromRequest(ctx: RouterContext): string | undefined {
  const auth = firstHeader(ctx, 'authorization');
  if (auth?.startsWith('Bearer ')) return auth.slice(7);
  return firstQuery(ctx, 'access_token');
}

export class MilkyWebhookEndpoint extends EventEmitter implements Endpoint<MilkyWebhookConfig, MilkyEvent> {
  $connected: boolean = true;

  get logger() {
    return this.adapter.plugin.logger;
  }

  constructor(
    public adapter: MilkyAdapter,
    public router: Router,
    public $config: MilkyWebhookConfig,
  ) {
    super();
  }

  get $id() {
    return this.$config.name;
  }

  async $connect(): Promise<void> {
    const path = this.$config.path.startsWith('/') ? this.$config.path : `/${this.$config.path}`;
    const token = this.$config.access_token;
    registerFetchRoute(this.router, 'POST', path, async (ctx: RouterContext) => {
      const received = getAccessTokenFromRequest(ctx);
      if (token && received !== token) {
        ctx.status = 401;
        ctx.body = { retcode: 401, message: 'Unauthorized' };
        return;
      }
      const body = ctx.request.body;
      if (!body || typeof body !== 'object') {
        ctx.status = 400;
        ctx.body = { retcode: 400, message: 'Invalid JSON' };
        return;
      }
      const event = body as MilkyEvent;
      this.handleEvent(event);
      ctx.status = 200;
      ctx.body = { retcode: 0 };
    });
    this.logger.info(formatCompact( { op: 'webhook', path }));
  }

  async $disconnect(): Promise<void> {
    this.$connected = false;
  }

  $formatMessage(event: MilkyEvent): Message<MilkyEvent> {
    const data = parseMessageReceiveData(event);
    if (!data) {
      return Message.from(event, {
        $id: '',
        $adapter: 'milky',
        $endpoint: this.$config.name,
        $channel: { id: '', type: 'private' },
        $sender: { id: '', name: '' },
        $content: [],
        $raw: '',
        $timestamp: event.time ?? 0,
        $recall: async () => {},
        $reply: async () => '',
      });
    }
    const payload = formatMilkyMessagePayload(
      event,
      data,
      (id) => this.$recallMessage(id),
      (channel, content) =>
        this.adapter.sendMessage({
          ...channel,
          context: 'milky',
          endpoint: this.$config.name,
          content: content as import('zhin.js').SendContent,
        }),
      'milky',
      this.$config.name,
    );
    return Message.from(event, payload);
  }

  private handleEvent(event: MilkyEvent): void {
    const data = parseMessageReceiveData(event);
    if (data) {
      const message = this.$formatMessage(event);
      this.adapter.emit('message.receive', message);
      this.logger.debug(
        `${this.$config.name} recv ${message.$channel.type}(${message.$channel.id}):${segment.raw(message.$content)}`,
      );
    }
  }

  private apiOptions() {
    return { baseUrl: this.$config.baseUrl, access_token: this.$config.access_token };
  }

  async $sendMessage(options: SendOptions): Promise<string> {
    const content = Array.isArray(options.content) ? options.content : [options.content];
    const segments = content.map((c) =>
      typeof c === 'string' ? { type: 'text' as const, data: { text: c } } : (c as { type: string; data?: Record<string, unknown> }),
    );
    const message = toMilkyOutgoingSegments(segments);
    if (options.type === 'group') {
      const result = await callApi(this.apiOptions(), 'send_group_message', {
        group_id: parseInt(options.id, 10),
        message,
      });
      const seq = (result as { message_seq?: number }).message_seq;
      return seq != null ? `group:${options.id}:${seq}` : '';
    }
    if (options.type === 'private') {
      const result = await callApi(this.apiOptions(), 'send_private_message', {
        user_id: parseInt(options.id, 10),
        message,
      });
      const seq = (result as { message_seq?: number }).message_seq;
      return seq != null ? `friend:${options.id}:${seq}` : '';
    }
    throw new Error('Either group or private must be provided');
  }

  async $recallMessage(id: string): Promise<void> {
    const parsed = parseMilkyMessageId(id);
    if (!parsed) throw new Error(`Invalid message id: ${id}`);
    if (parsed.message_scene === 'group') {
      await callApi(this.apiOptions(), 'recall_group_message', {
        group_id: parsed.peer_id,
        message_seq: parsed.message_seq,
      });
    } else {
      await callApi(this.apiOptions(), 'recall_private_message', {
        user_id: parsed.peer_id,
        message_seq: parsed.message_seq,
      });
    }
  }

  async kickMember(groupId: number, userId: number, rejectAddRequest = false): Promise<boolean> {
    await callApi(this.apiOptions(), 'kick_group_member', {
      group_id: groupId,
      user_id: userId,
      reject_add_request: rejectAddRequest,
    });
    return true;
  }

  async muteMember(groupId: number, userId: number, duration = 600): Promise<boolean> {
    await callApi(this.apiOptions(), 'set_group_member_mute', {
      group_id: groupId,
      user_id: userId,
      duration,
    });
    return true;
  }

  async muteAll(groupId: number, enable = true): Promise<boolean> {
    await callApi(this.apiOptions(), 'set_group_whole_mute', { group_id: groupId, is_mute: enable });
    return true;
  }

  async setAdmin(groupId: number, userId: number, enable = true): Promise<boolean> {
    await callApi(this.apiOptions(), 'set_group_member_admin', {
      group_id: groupId,
      user_id: userId,
      is_set: enable,
    });
    return true;
  }

  async setCard(groupId: number, userId: number, card: string): Promise<boolean> {
    await callApi(this.apiOptions(), 'set_group_member_card', {
      group_id: groupId,
      user_id: userId,
      card,
    });
    return true;
  }

  async setTitle(groupId: number, userId: number, title: string): Promise<boolean> {
    await callApi(this.apiOptions(), 'set_group_member_special_title', {
      group_id: groupId,
      user_id: userId,
      special_title: title,
    });
    return true;
  }

  async setGroupName(groupId: number, name: string): Promise<boolean> {
    await callApi(this.apiOptions(), 'set_group_name', { group_id: groupId, new_group_name: name });
    return true;
  }

  async getMemberList(groupId: number): Promise<unknown[]> {
    return callApi(this.apiOptions(), 'get_group_member_list', { group_id: groupId }) as Promise<unknown[]>;
  }

  async getGroupInfo(groupId: number): Promise<unknown> {
    return callApi(this.apiOptions(), 'get_group_info', { group_id: groupId });
  }
}