// ==UserScript==
// @name         Neuroglancer Copy Completion Row
// @namespace    eyewire-elite
// @version      2.1.1
// @description  Copies completion date, selected segment ID, and a clickable Neuroglancer link for Google Sheets.
// @match        https://spelunker.cave-explorer.org/*
// @run-at       document-idle
// @grant        GM_setClipboard
// ==/UserScript==

(function () {
  'use strict';

  const CONFIG = Object.freeze({
    buttonId: 'nseraf-copy-completion-widget',

    positionStorageKey:
      'nseraf-copy-completion-widget-position-v1',

    defaultPosition: {
      top: 75,
      right: 20
    },

    dragThresholdPixels: 4
  });

  let dragState = null;

  installWidget();


  // ==========================================================================
  // DRAGGABLE COPY BUTTON
  // ==========================================================================

  function installWidget() {
    if (document.getElementById(CONFIG.buttonId)) {
      return;
    }

    const widget = document.createElement('div');

    widget.id = CONFIG.buttonId;

    widget.title =
      'Drag to reposition. Click to copy completion data.';

    Object.assign(widget.style, {
      position: 'fixed',
      zIndex: '2147483647',
      display: 'flex',
      flexDirection: 'column',
      alignItems: 'stretch',
      minWidth: '170px',
      maxWidth: '310px',
      fontFamily: 'Arial, Helvetica, sans-serif',
      userSelect: 'none',
      touchAction: 'none'
    });

    const button = document.createElement('button');

    button.type = 'button';
    button.textContent = 'Copy completion';

    Object.assign(button.style, {
      border: '1px solid rgba(255, 255, 255, 0.65)',
      borderRadius: '7px',
      padding: '9px 13px',
      background: '#1769aa',
      color: '#ffffff',
      fontSize: '13px',
      fontWeight: 'bold',
      cursor: 'grab',
      boxShadow: '0 2px 8px rgba(0, 0, 0, 0.45)'
    });

    const message = document.createElement('div');

    Object.assign(message.style, {
      display: 'none',
      marginTop: '5px',
      padding: '7px 9px',
      borderRadius: '6px',
      background: 'rgba(0, 0, 0, 0.88)',
      color: '#ffffff',
      fontSize: '12px',
      lineHeight: '1.35',
      overflowWrap: 'anywhere',
      whiteSpace: 'pre-wrap'
    });

    widget.appendChild(button);
    widget.appendChild(message);

    document.documentElement.appendChild(widget);

    restorePosition(widget);
    keepWidgetOnScreen(widget);

    button.addEventListener(
      'pointerdown',
      function (event) {
        beginDrag(event, widget, button);
      }
    );

    button.addEventListener(
      'pointermove',
      function (event) {
        continueDrag(event, widget);
      }
    );

    button.addEventListener(
      'pointerup',
      function (event) {
        finishDrag(
          event,
          widget,
          button,
          message
        );
      }
    );

    button.addEventListener(
      'pointercancel',
      function () {
        cancelDrag(button);
      }
    );

    window.addEventListener(
      'resize',
      function () {
        keepWidgetOnScreen(widget);
        savePosition(widget);
      }
    );
  }


  function beginDrag(event, widget, button) {
    if (
      event.pointerType === 'mouse' &&
      event.button !== 0
    ) {
      return;
    }

    const rectangle =
      widget.getBoundingClientRect();

    dragState = {
      pointerId: event.pointerId,
      startPointerX: event.clientX,
      startPointerY: event.clientY,
      startWidgetLeft: rectangle.left,
      startWidgetTop: rectangle.top,
      moved: false
    };

    button.setPointerCapture(
      event.pointerId
    );

    button.style.cursor = 'grabbing';

    event.preventDefault();
  }


  function continueDrag(event, widget) {
    if (
      !dragState ||
      event.pointerId !== dragState.pointerId
    ) {
      return;
    }

    const deltaX =
      event.clientX -
      dragState.startPointerX;

    const deltaY =
      event.clientY -
      dragState.startPointerY;

    if (
      Math.abs(deltaX) >=
        CONFIG.dragThresholdPixels ||
      Math.abs(deltaY) >=
        CONFIG.dragThresholdPixels
    ) {
      dragState.moved = true;
    }

    if (!dragState.moved) {
      return;
    }

    const rectangle =
      widget.getBoundingClientRect();

    const maximumLeft = Math.max(
      0,
      window.innerWidth - rectangle.width
    );

    const maximumTop = Math.max(
      0,
      window.innerHeight - rectangle.height
    );

    const nextLeft = clamp(
      dragState.startWidgetLeft + deltaX,
      0,
      maximumLeft
    );

    const nextTop = clamp(
      dragState.startWidgetTop + deltaY,
      0,
      maximumTop
    );

    widget.style.left =
      nextLeft + 'px';

    widget.style.top =
      nextTop + 'px';

    widget.style.right = 'auto';
    widget.style.bottom = 'auto';

    event.preventDefault();
  }


  function finishDrag(
    event,
    widget,
    button,
    message
  ) {
    if (
      !dragState ||
      event.pointerId !== dragState.pointerId
    ) {
      return;
    }

    const wasDragged =
      dragState.moved;

    try {
      button.releasePointerCapture(
        event.pointerId
      );
    } catch (error) {
      // Pointer capture may already be released.
    }

    dragState = null;
    button.style.cursor = 'grab';

    if (wasDragged) {
      keepWidgetOnScreen(widget);
      savePosition(widget);

      showMessage(
        message,
        'Button position saved.',
        'success'
      );
    } else {
      copyCompletionData(
        button,
        message
      );
    }

    event.preventDefault();
  }


  function cancelDrag(button) {
    dragState = null;
    button.style.cursor = 'grab';
  }


  // ==========================================================================
  // COPY COMPLETION DATA
  // ==========================================================================

async function copyCompletionData(
  button,
  message
) {
  const originalText = button.textContent;

  try {
    button.disabled = true;
    button.textContent = 'Reading viewer…';

    const v = unsafeWindow.viewer;
    if (!v) {
      throw new Error(
        'The global "viewer" object was not found. Make sure you are in the correct frame/window.'
      );
    }

    // Extract segment IDs from the current long URL before shortening
    const currentUrl = window.location.href;
    const segmentIds = extractSelectedSegmentIds(currentUrl);

    if (segmentIds.length === 0) {
      throw new Error(
        'No selected segment was found in the current Neuroglancer URL.'
      );
    }

    if (segmentIds.length > 1) {
      throw new Error(
        'Multiple selected segments were found: ' +
        segmentIds.join(', ') +
        '. Leave only the final segment selected and try again.'
      );
    }

    const completionDate = formatLocalDate(new Date());
    const finalSegmentId = segmentIds[0];

    button.textContent = 'Saving state…';
    const state = v.state.toJSON();

    // Determine state server endpoint
    let stateServerUrl =
      state.jsonStateServer ||
      v.jsonStateServer ||
      'https://global.daf-apis.com/nglstate/api/v1/post';

    // Helper to identify a 32-character CAVE/DAF token
    const findTokenInValue = (val) => {
      if (!val) return null;
      val = val.trim();
      try {
        const parsed = JSON.parse(val);
        if (typeof parsed === 'string') {
          val = parsed;
        } else if (typeof parsed === 'object' && parsed !== null) {
          for (const k in parsed) {
            const subVal = parsed[k];
            if (
              typeof subVal === 'string' &&
              /^[0-9a-f]{32}$/i.test(subVal.trim())
            ) {
              return subVal.trim();
            }
          }
        }
      } catch {}
      val = val.replace(/^["']|["']$/g, '').trim();
      return /^[0-9a-f]{32}$/i.test(val) ? val : null;
    };

    // Scan storage to locate an active token
    const scanForToken = () => {
      const keys = [
        'token',
        'middleauth_token',
        'cave-token',
        'cave_token',
        'api_token',
        'secret',
        'cave_secret',
      ];
      for (const key of keys) {
        const tok =
          findTokenInValue(localStorage.getItem(key)) ||
          findTokenInValue(sessionStorage.getItem(key));
        if (tok) return tok;
      }
      for (let i = 0; i < localStorage.length; i++) {
        const tok = findTokenInValue(
          localStorage.getItem(localStorage.key(i))
        );
        if (tok) return tok;
      }
      for (let i = 0; i < sessionStorage.length; i++) {
        const tok = findTokenInValue(
          sessionStorage.getItem(sessionStorage.key(i))
        );
        if (tok) return tok;
      }
      return null;
    };

    let token = scanForToken();

    const uploadState = async (authToken) => {
      const headers = { 'Content-Type': 'application/json' };
      if (authToken) {
        headers.Authorization = `Bearer ${authToken}`;
      }
      const response = await fetch(stateServerUrl, {
        method: 'POST',
        headers: headers,
        body: JSON.stringify(state),
      });
      return response;
    };

    let response = await uploadState(token);

    // Prompt user if the state server rejects authorization
    if (response.status === 401) {
      const isFlywire = stateServerUrl.includes('flywire');
      const tokenPortalUrl = isFlywire
        ? 'https://globalv1.flywire-daf.com/auth/api/v1/user/token'
        : 'https://global.daf-apis.com/auth/api/v1/user/token';

      const userToken = prompt(
        `An API token is required to save states to this server.\n\n1. Please visit:\n${tokenPortalUrl}\n2. Copy the token\n3. Paste it here:`,
        token || ''
      );

      if (!userToken) {
        throw new Error('API token is required to generate the short link.');
      }

      token = userToken.trim();

      // Persist token so user doesn't need to re-enter it next time
      if (/^[0-9a-f]{32}$/i.test(token)) {
        localStorage.setItem('cave_token', token);
      }

      response = await uploadState(token);
    }

    if (!response.ok) {
      throw new Error(
        `State server responded with status: ${response.status}`
      );
    }

    // Parse the state ID
    const contentType = response.headers.get('content-type');
    let stateId;

    if (contentType && contentType.includes('application/json')) {
      stateId = await response.json();
    }

    // Format the final shortened URL
    let fetchEndpoint = stateServerUrl.replace(/\/post\/?$/, '');
    let finalUrl;

    if (
      window.location.origin.includes('flywire') ||
      stateServerUrl.includes('flywire')
    ) {
      finalUrl = `https://ngl.flywire.ai/?json_url=${fetchEndpoint}/${stateId}`;
    } else {
      finalUrl = `https://spelunker.cave-explorer.org/#!middleauth+${stateId}`;
    }

    /*
     * Escape quotation marks so the URL can safely be placed inside a
     * Google Sheets HYPERLINK formula.
     */
    const safeFinalUrl = finalUrl.replace(/"/g, '""');

    /*
     * Tab-separated values paste into adjacent Google Sheets columns:
     *
     * K = Date Complete
     * L = Final SegID
     * M = Final Link
     */
    const clipboardText = [
      completionDate,
      finalSegmentId,
      safeFinalUrl,
    ].join('\t');

    button.textContent = 'Copying…';

    await copyTextToClipboard(clipboardText);

    button.textContent = 'Copied ✓';

    showMessage(
      message,
      'Copied:\n' +
        completionDate +
        ' | ' +
        finalSegmentId +
        '\nPaste into the row’s column K cell.',
      'success'
    );
  } catch (error) {
    console.error('[Completion script] Copy failed:', error);

    button.textContent = 'Copy failed';

    showMessage(
      message,
      error && error.message ? error.message : String(error),
      'error'
    );
  } finally {
    window.setTimeout(function () {
      button.disabled = false;
      button.textContent = originalText;
    }, 1800);
  }
}

  /**
   * Extracts all selected segmentation IDs from the current URL state.
   */
  function extractSelectedSegmentIds(
    url
  ) {
    const marker = '#!';

    const markerIndex =
      url.indexOf(marker);

    if (markerIndex === -1) {
      throw new Error(
        'The URL does not contain a Neuroglancer #! viewer state.'
      );
    }

    const encodedState =
      url.substring(
        markerIndex +
        marker.length
      );

    let decodedState;

    try {
      decodedState =
        decodeURIComponent(
          encodedState
        );
    } catch (error) {
      throw new Error(
        'The Neuroglancer URL could not be decoded.'
      );
    }

    let viewerState;

    try {
      viewerState =
        JSON.parse(
          decodedState
        );
    } catch (error) {
      throw new Error(
        'The decoded Neuroglancer state is not valid JSON.'
      );
    }

    if (
      !Array.isArray(
        viewerState.layers
      )
    ) {
      throw new Error(
        'The Neuroglancer state does not contain a layer list.'
      );
    }

    const segmentIds = [];

    viewerState.layers.forEach(
      function (layer) {
        if (
          !layer ||
          layer.type !==
            'segmentation' ||
          !Array.isArray(
            layer.segments
          )
        ) {
          return;
        }

        layer.segments.forEach(
          function (segmentId) {
            const value =
              String(
                segmentId
              ).trim();

            if (/^\d+$/.test(value)) {
              segmentIds.push(value);
            }
          }
        );
      }
    );

    return Array.from(
      new Set(segmentIds)
    );
  }


  /**
   * Produces dates such as 8/5/2026 using the computer's local date.
   */
  function formatLocalDate(date) {
    return [
      date.getMonth() + 1,
      date.getDate(),
      date.getFullYear()
    ].join('/');
  }


  async function copyTextToClipboard(
    text
  ) {
    if (
      typeof GM_setClipboard ===
      'function'
    ) {
      GM_setClipboard(
        text,
        'text'
      );

      return;
    }

    if (
      navigator.clipboard &&
      typeof navigator.clipboard
        .writeText === 'function'
    ) {
      await navigator.clipboard
        .writeText(text);

      return;
    }

    const temporaryTextArea =
      document.createElement(
        'textarea'
      );

    temporaryTextArea.value =
      text;

    temporaryTextArea.setAttribute(
      'readonly',
      ''
    );

    Object.assign(
      temporaryTextArea.style,
      {
        position: 'fixed',
        left: '-9999px',
        top: '0'
      }
    );

    document.body.appendChild(
      temporaryTextArea
    );

    temporaryTextArea.select();

    const copied =
      document.execCommand(
        'copy'
      );

    temporaryTextArea.remove();

    if (!copied) {
      throw new Error(
        'The browser refused clipboard access.'
      );
    }
  }


  // ==========================================================================
  // SAVED BUTTON POSITION
  // ==========================================================================

  function savePosition(widget) {
    const rectangle =
      widget.getBoundingClientRect();

    const position = {
      left: Math.round(
        rectangle.left
      ),
      top: Math.round(
        rectangle.top
      )
    };

    try {
      localStorage.setItem(
        CONFIG.positionStorageKey,
        JSON.stringify(position)
      );
    } catch (error) {
      console.warn(
        '[Completion script] Could not save button position:',
        error
      );
    }
  }


  function restorePosition(widget) {
    let restoredPosition = null;

    try {
      const storedValue =
        localStorage.getItem(
          CONFIG.positionStorageKey
        );

      if (storedValue) {
        restoredPosition =
          JSON.parse(storedValue);
      }
    } catch (error) {
      console.warn(
        '[Completion script] Could not restore button position:',
        error
      );
    }

    if (
      restoredPosition &&
      Number.isFinite(
        restoredPosition.left
      ) &&
      Number.isFinite(
        restoredPosition.top
      )
    ) {
      widget.style.left =
        restoredPosition.left +
        'px';

      widget.style.top =
        restoredPosition.top +
        'px';

      widget.style.right =
        'auto';

      return;
    }

    widget.style.top =
      CONFIG.defaultPosition.top +
      'px';

    widget.style.right =
      CONFIG.defaultPosition.right +
      'px';
  }


  function keepWidgetOnScreen(widget) {
    const rectangle =
      widget.getBoundingClientRect();

    const maximumLeft = Math.max(
      0,
      window.innerWidth -
      rectangle.width
    );

    const maximumTop = Math.max(
      0,
      window.innerHeight -
      rectangle.height
    );

    const nextLeft = clamp(
      rectangle.left,
      0,
      maximumLeft
    );

    const nextTop = clamp(
      rectangle.top,
      0,
      maximumTop
    );

    widget.style.left =
      nextLeft + 'px';

    widget.style.top =
      nextTop + 'px';

    widget.style.right =
      'auto';

    widget.style.bottom =
      'auto';
  }


  function showMessage(
    messageElement,
    text,
    type
  ) {
    messageElement.textContent =
      text;

    messageElement.style.background =
      type === 'error'
        ? 'rgba(165, 20, 20, 0.95)'
        : 'rgba(0, 105, 45, 0.95)';

    messageElement.style.display =
      'block';

    window.clearTimeout(
      showMessage.timeoutId
    );

    showMessage.timeoutId =
      window.setTimeout(
        function () {
          messageElement.style.display =
            'none';
        },
        6000
      );
  }


  function clamp(
    value,
    minimum,
    maximum
  ) {
    return Math.min(
      Math.max(
        value,
        minimum
      ),
      maximum
    );
  }
})();