import axios, { AxiosInstance } from 'axios';
import type {
  User,
  AuthTokens,
  Asset,
  AssetListResponse,
  CreateUploadRequest,
  CreateUploadResponse,
  DownloadUrlResponse,
  Share,
  CreateShareRequest,
  ShareWithAssetResponse,
} from '../types';

const API_URL = import.meta.env.VITE_API_URL || 'http://localhost:8000';

class ApiClient {
  private client: AxiosInstance;

  constructor() {
    this.client = axios.create({
      baseURL: `${API_URL}/api/v1`,
      headers: {
        'Content-Type': 'application/json',
      },
    });

    // Add auth token to requests
    this.client.interceptors.request.use((config) => {
      const token = localStorage.getItem('access_token');
      if (token) {
        config.headers.Authorization = `Bearer ${token}`;
      }
      return config;
    });

    // Handle 401 errors
    this.client.interceptors.response.use(
      (response) => response,
      (error) => {
        if (error.response?.status === 401) {
          localStorage.removeItem('access_token');
          localStorage.removeItem('refresh_token');
          window.location.href = '/login';
        }
        return Promise.reject(error);
      }
    );
  }

  // Auth
  async register(email: string, password: string): Promise<User> {
    const { data } = await this.client.post('/auth/register', { email, password });
    return data;
  }

  async login(email: string, password: string): Promise<AuthTokens> {
    const { data } = await this.client.post('/auth/login', { email, password });
    localStorage.setItem('access_token', data.access_token);
    localStorage.setItem('refresh_token', data.refresh_token);
    return data;
  }

  async getMe(): Promise<User> {
    const { data } = await this.client.get('/auth/me');
    return data;
  }

  logout(): void {
    localStorage.removeItem('access_token');
    localStorage.removeItem('refresh_token');
  }

  // Assets
  async listAssets(params?: {
    cursor?: string;
    limit?: number;
    type?: string;
  }): Promise<AssetListResponse> {
    const { data } = await this.client.get('/assets', { params });
    return data;
  }

  async getAsset(assetId: string): Promise<Asset> {
    const { data } = await this.client.get(`/assets/${assetId}`);
    return data;
  }

  async getDownloadUrl(assetId: string, kind: 'original' | 'thumb' = 'original'): Promise<string> {
    const { data } = await this.client.get<DownloadUrlResponse>(
      `/assets/${assetId}/download-url`,
      { params: { kind } }
    );
    return data.url;
  }

  async getMediaBlob(assetId: string, kind: 'original' | 'thumb' = 'original'): Promise<Blob> {
    const response = await this.client.get(`/assets/${assetId}/media`, {
      params: { kind },
      responseType: 'blob',
    });
    return response.data;
  }

  async deleteAsset(assetId: string): Promise<Asset> {
    const { data } = await this.client.delete(`/assets/${assetId}`);
    return data;
  }

  async restoreAsset(assetId: string): Promise<Asset> {
    const { data } = await this.client.post(`/assets/${assetId}/restore`);
    return data;
  }

  async purgeAsset(assetId: string): Promise<void> {
    await this.client.delete(`/assets/${assetId}/purge`);
  }

  // Upload
  async createUpload(request: CreateUploadRequest): Promise<CreateUploadResponse> {
    const { data } = await this.client.post('/uploads/create', request);
    return data;
  }

  async uploadToS3(url: string, file: File, fields?: Record<string, string>): Promise<void> {
    const formData = new FormData();

    // Add fields first (for pre-signed POST)
    if (fields) {
      Object.entries(fields).forEach(([key, value]) => {
        formData.append(key, value);
      });
    }

    // Add file last
    formData.append('file', file);

    await axios.post(url, formData, {
      headers: {
        'Content-Type': 'multipart/form-data',
      },
    });
  }

  async uploadFileToBackend(assetId: string, file: File): Promise<void> {
    const formData = new FormData();
    formData.append('file', file);

    await this.client.post(`/uploads/${assetId}/file`, formData, {
      headers: {
        'Content-Type': 'multipart/form-data',
      },
    });
  }

  async finalizeUpload(assetId: string, etag?: string, sha256?: string): Promise<Asset> {
    const { data } = await this.client.post(`/uploads/${assetId}/finalize`, { etag, sha256 });
    return data;
  }

  // Shares
  async createShare(request: CreateShareRequest): Promise<Share> {
    const { data } = await this.client.post('/shares', request);
    return data;
  }

  async getShare(token: string, password?: string): Promise<ShareWithAssetResponse> {
    const { data } = await this.client.get(`/shares/${token}`, {
      params: password ? { password } : undefined,
    });
    return data;
  }

  async getShareDownloadUrl(
    token: string,
    assetId: string,
    kind: 'original' | 'thumb' = 'original',
    password?: string
  ): Promise<string> {
    const { data } = await this.client.get<DownloadUrlResponse>(
      `/shares/${token}/download-url`,
      {
        params: { asset_id: assetId, kind, password },
      }
    );
    return data.url;
  }

  async revokeShare(token: string): Promise<Share> {
    const { data } = await this.client.post(`/shares/${token}/revoke`);
    return data;
  }
}

export default new ApiClient();