export class FileClientService {

  currentFetches = {};

  constructor(private authenticatedClient) {
  }

  async saveFile(path, content) {
    const response = await this.authenticatedClient.fetchApi(`/api/file${path}`, {
      method: 'put',
      headers: {
        'Content-type': 'text/plain'
      },
      body: content
    });
    delete this.currentFetches[path];

    const retVal = {
      path,
      googleId: response.headers.get('wgd-google-id'),
      mimeType: response.headers.get('Content-type').split(';')[0].trim(),
      driveEmpty: response.headers.get('wgd-drive-empty') === 'true',
      treeEmpty: response.headers.get('wgd-tree-empty') === 'true',
      treeVersion: response.headers.get('wgd-tree-version'),
      contentDir: response.headers.get('wgd-content-dir'),
      files: undefined
    };

    const text = await response.text();
    return {
      ...retVal,
      content: text
    };
  }

  async getFile(path) {
    if (this.currentFetches[path]) {
      return this.currentFetches[path];
    }

    // eslint-disable-next-line no-async-promise-executor
    this.currentFetches[path] = new Promise(async (resolve, reject) => {
      try {
        const response = await this.authenticatedClient.fetchApi(`/api/file${path}`);

        const retVal = {
          path,
          googleId: response.headers.get('wgd-google-id'),
          mimeType: response.headers.get('Content-type').split(';')[0].trim(),
          driveEmpty: response.headers.get('wgd-drive-empty') === 'true',
          treeEmpty: response.headers.get('wgd-tree-empty') === 'true',
          treeVersion: response.headers.get('wgd-tree-version'),
          contentDir: response.headers.get('wgd-content-dir'),
          files: undefined
        };

        if (retVal.mimeType === 'application/vnd.google-apps.folder') {
          retVal.files = await response.json();
          resolve(retVal);
          return;
        }

        const text = await response.text();

        resolve({
          ...retVal,
          content: text
        });
      } catch (err) {
        reject(err);
      } finally {
        delete this.currentFetches[path];
      }
    });

    return this.currentFetches[path];
  }

  async removeFile(path) {
    const response = await this.authenticatedClient.fetchApi(`/api/file${path}`, {
      method: 'delete'
    });
  }

  async getBacklinks(driveId, fileId) {
    const response = await this.authenticatedClient.fetchApi(`/api/backlinks/${driveId}/${fileId}`);
    return await response.json();
  }

}