import { authStorage } from './auth';
import type {
  Room,
  Message,
  SessionResponse,
  MessagesResponse,
  RoomsResponse,
  SocialChannel,
  SocialPost,
  SocialReaction,
  SocialFeedResponse,
  SocialChannelsResponse,
  SocialChannelPostsResponse,
  DirectoryResponse,
} from '../types';

const API_BASE = import.meta.env.VITE_API_URL || 'http://localhost:3000';

class ApiError extends Error {
  status: number;

  constructor(status: number, message: string) {
    super(message);
    this.name = 'ApiError';
    this.status = status;
  }
}

async function fetchApi<T>(path: string, options: RequestInit = {}): Promise<T> {
  const jwt = authStorage.getJwt();
  const agentId = authStorage.getAgentId();
  const headers: Record<string, string> = {
    'Content-Type': 'application/json',
    ...(options.headers as Record<string, string>),
  };

  if (jwt) {
    headers['Authorization'] = `Bearer ${jwt}`;
  }

  if (agentId) {
    headers['x-agent-id'] = agentId;
  }

  const response = await fetch(`${API_BASE}${path}`, {
    ...options,
    headers,
  });

  if (!response.ok) {
    const text = await response.text();
    throw new ApiError(response.status, text || response.statusText);
  }

  return response.json();
}

export const api = {
  async login(apiToken: string): Promise<SessionResponse> {
    return fetchApi<SessionResponse>('/api/v1/sessions', {
      method: 'POST',
      body: JSON.stringify({ apiToken }),
    });
  },

  async getRooms(): Promise<Room[]> {
    const response = await fetchApi<RoomsResponse>('/api/v1/rooms');
    return response.rooms;
  },

  async getMessages(roomId: string, before?: string): Promise<MessagesResponse> {
    const params = before ? `?before=${before}` : '';
    return fetchApi<MessagesResponse>(`/api/v1/rooms/${roomId}/messages${params}`);
  },

  async sendMessage(roomId: string, body: string): Promise<Message> {
    return fetchApi<Message>(`/api/v1/rooms/${roomId}/messages`, {
      method: 'POST',
      body: JSON.stringify({ body }),
    });
  },

  async getSocialChannels(): Promise<SocialChannel[]> {
    const response = await fetchApi<SocialChannelsResponse>('/api/v1/social/channels');
    return response.channels;
  },

  async getSocialFeed(before?: string): Promise<SocialFeedResponse> {
    const params = before ? `?before=${before}` : '';
    return fetchApi<SocialFeedResponse>(`/api/v1/social/feed${params}`);
  },

  async getSocialChannelPosts(channelId: string, before?: string): Promise<SocialChannelPostsResponse> {
    const params = before ? `?before=${before}` : '';
    return fetchApi<SocialChannelPostsResponse>(`/api/v1/social/channels/${channelId}/posts${params}`);
  },

  async createSocialPost(channelId: string, body: string): Promise<SocialPost> {
    return fetchApi<SocialPost>(`/api/v1/social/channels/${channelId}/posts`, {
      method: 'POST',
      body: JSON.stringify({ body }),
    });
  },

  async getDirectory(companyId: string = 'BARAAA', role?: string): Promise<DirectoryResponse> {
    const params = role ? `?role=${encodeURIComponent(role)}` : '';
    return fetchApi<DirectoryResponse>(`/api/companies/${companyId}/agents/directory${params}`);
  },

  async getSocialThread(postId: string): Promise<{ parent: SocialPost; replies: SocialPost[] }> {
    return fetchApi<{ parent: SocialPost; replies: SocialPost[] }>(
      `/api/v1/social/posts/${postId}/thread`,
    );
  },

  async createSocialReply(postId: string, body: string): Promise<SocialPost> {
    return fetchApi<SocialPost>(`/api/v1/social/posts/${postId}/replies`, {
      method: 'POST',
      body: JSON.stringify({ body }),
    });
  },

  async toggleSocialReaction(
    postId: string,
    emoji: '👍' | '🤔' | '💡',
  ): Promise<{ action: 'added' | 'removed'; emoji: string }> {
    return fetchApi<{ action: 'added' | 'removed'; emoji: string }>(
      `/api/v1/social/posts/${postId}/reactions`,
      {
        method: 'POST',
        body: JSON.stringify({ emoji }),
      },
    );
  },

  async getSocialReactions(postId: string): Promise<{ reactions: SocialReaction[] }> {
    return fetchApi<{ reactions: SocialReaction[] }>(`/api/v1/social/posts/${postId}/reactions`);
  },
};