class Api {

  constructor(baseUrl) {
    this.baseUrl = baseUrl;
  }

  fetchUrl(url, body) {
    return fetch(url, {
      method: "POST",
      headers: {
        "Content-Type": "application/json",
      },
      body: JSON.stringify(body),
    }).then(it => {
      if (it.status !== 200) {
        showError(it);
      }
      return it;
    });
  }

  async uploadVideo(video, password) {
    const formData = new FormData();
    formData.append('file', video);
    formData.append('password', await this.hashPassword(password));
    return fetch(`${this.baseUrl}/upload-video.php`, { method: 'POST', body: formData });
  }

  async deleteVideo(video, password) {
    return this.fetchUrl(`${this.baseUrl}/delete-video.php`, { password: await this.hashPassword(password), file: video });
  }

  async fetchVideos(password) {
    return this.fetchUrl(`${this.baseUrl}/videos.php`, { password: await this.hashPassword(password) });
  }

  async hashPassword(password) {
      // Encode the password as a Uint8Array
      const encoder = new TextEncoder();
      const data = encoder.encode(password);

      // Hash the password using SHA-256
      const hashBuffer = await crypto.subtle.digest('SHA-256', data);

      // Convert the hash to a hex string
      const hashArray = Array.from(new Uint8Array(hashBuffer));
      const hashHex = hashArray.map(b => b.toString(16).padStart(2, '0')).join('');

      return hashHex;
  }
}


async function showError(error) {
  const toaster = document.createElement('span');
  toaster.classList.add('position-absolute');
  toaster.classList.add('bg-danger');
  toaster.classList.add('text-light');
  toaster.classList.add('p-3');
  toaster.classList.add('m-3');
  toaster.style.top = 0;
  toaster.style.right = 0;

  if (error.status === 401) {
    toaster.innerHTML = 'Nesprávne heslo';
  } else if (error.status === 404) {
    toaster.innerHTML = 'Súbor neexstuje';
  } else {
    toaster.innerHTML = 'Chyba';
  }

  document.body.appendChild(toaster);

  setTimeout(() => {
    document.body.removeChild(toaster);
  }, 6000);
  console.error(error, await error.json());
}