// SPDX-FileCopyrightText: 2021 Luke Granger-Brown <depot@lukegb.com>
//
// SPDX-License-Identifier: Apache-2.0

document.body.classList.add('has-js');

if (document.body.classList.contains('upload-page')) {
  const uploadListEl = document.body.querySelector('.upload-list');
  const inputFileEl = document.body.querySelector('#file');
  const expiryEl = document.body.querySelector('#expiry');

  const uploadFile = (file, expiry) => {
    const progressEl = document.createElement('li');
    progressEl.classList.add('upload-list-element');
    uploadListEl.appendChild(progressEl);

    const bgEl = document.createElement('div');
    bgEl.classList.add('upload-list-background');
    progressEl.appendChild(bgEl);

    const bgFilenameEl = document.createElement('span');
    bgFilenameEl.classList.add('upload-list-filename');
    bgFilenameEl.textContent = file.name;
    bgEl.appendChild(bgFilenameEl);

    const bgSpacerNode = document.createTextNode(' ');
    bgEl.appendChild(bgSpacerNode);

    const bgPercentEl = document.createElement('span');
    bgPercentEl.classList.add('upload-list-progress');
    bgPercentEl.textContent = file.size == 0 ? '(unknown)' : '(0%)';
    bgEl.appendChild(bgPercentEl);

    const barEl = document.createElement('div');
    barEl.classList.add('upload-list-bar');
    progressEl.appendChild(barEl);

    const barContainerEl = document.createElement('div');
    barContainerEl.classList.add('upload-list-bar-container');
    barEl.appendChild(barContainerEl);

    const barFilenameEl = document.createElement('span');
    barFilenameEl.classList.add('upload-list-filename');
    barFilenameEl.textContent = file.name;
    barContainerEl.appendChild(barFilenameEl);

    const barSpacerNode = document.createTextNode(' ');
    barContainerEl.appendChild(barSpacerNode);

    const barPercentEl = document.createElement('span');
    barPercentEl.classList.add('upload-list-progress');
    barPercentEl.textContent = file.size == 0 ? '(unknown)' : '(0%)';
    barContainerEl.appendChild(barPercentEl);

    const setPercentText = (txt) => {
      barPercentEl.textContent = txt;
      bgPercentEl.textContent = txt;
    };
    const setPercentPercent = (loaded, total) => {
      const pct = Math.floor((loaded * 1000) / total) / 10;
      setPercentText(`(${pct}%)`);
      barEl.style.width = `${pct}%`;
    };

    const hdrs = new Headers();
    hdrs.set('Content-Type', file.type);
    hdrs.set('Accept', 'application/json');

    const xhr = new XMLHttpRequest();
    xhr.upload.addEventListener('progress', (ev) => {
      if (!ev.lengthComputable) {
        setPercentText(`(unknown: ${ev.loaded} bytes)`);
      } else {
        setPercentPercent(ev.loaded, ev.total);
      }
    });
    xhr.upload.addEventListener('load', (ev) => {
      setPercentPercent(1, 1);
    });
    xhr.addEventListener('error', (ev) => {
      setPercentText(`(error: ${ev.message})`);
    });
    xhr.addEventListener('abort', (ev) => {
      setPercentText(`(aborted)`);
    });
    xhr.addEventListener('load', (ev) => {
      if (ev.status < 200 || ev.status >= 300) {
        setPercentText(`(error: HTTP status ${ev.status} - ${ev.message})`);
        return;
      }

      const respJSON = xhr.response;

      while (progressEl.firstChild) {
        progressEl.removeChild(progressEl.firstChild);
      }
      progressEl.classList.add('uploaded');

      const linkEl = document.createElement('a');
      linkEl.setAttribute('href', respJSON.display_url);
      linkEl.textContent = file.name;
      progressEl.appendChild(linkEl);
    });
    xhr.responseType = 'json';
    xhr.open('PUT', `/upload/${encodeURIComponent(file.name)}`);
    xhr.setRequestHeader('Content-Type', file.type);
    xhr.setRequestHeader('Accept', 'application/json');
    if (expiry !== "") {
      xhr.setRequestHeader('Fup-Expiry', expiry);
    }
    xhr.send(file);
  };

  inputFileEl.addEventListener('change', (ev) => {
    for (let i = 0; i < inputFileEl.files.length; i++) {
      const file = inputFileEl.files[i];

      uploadFile(file, expiryEl.value);
    }
  });

  document.body.addEventListener('dragenter', (e) => {
    e.preventDefault();
    e.stopPropagation();
    document.body.classList.add('dragging-over');
  }, false);
  document.body.addEventListener('dragover', (e) => {
    e.preventDefault();
    e.stopPropagation();
    document.body.classList.add('dragging-over');
  }, false);
  document.body.addEventListener('dragleave', (e) => {
    e.preventDefault();
    e.stopPropagation();
    document.body.classList.remove('dragging-over');
  }, false);
  document.body.addEventListener('drop', (e) => {
    e.preventDefault();
    e.stopPropagation();
    document.body.classList.remove('dragging-over');

    const dt = e.dataTransfer;
    const files = dt.files;

    for (const f of files) {
      uploadFile(f, expiryEl.value);
    }
  }, false);
}