// ==============================
// interface.js
// ==============================

// Store a reference to the <script> tag that loaded this file
const currentScriptTag = document.currentScript;

(async function() {
  // ─── 1. Locate the <script> and read data-config ───────────────────────────────
  let scriptTag = currentScriptTag;
  if (!scriptTag) {
    const scripts = document.getElementsByTagName('script');
    for (let i = 0; i < scripts.length; i++) {
      if (scripts[i].src.includes('interface.js') && scripts[i].hasAttribute('data-config')) {
        scriptTag = scripts[i];
        break;
      }
    }
    if (!scriptTag && scripts.length > 0) {
      scriptTag = scripts[scripts.length - 1];
    }
  }

  const configUrl = scriptTag.getAttribute('data-config');
  let config = {};
  if (configUrl) {
    try {
      const response = await fetch(configUrl);
      config = await response.json();
    } catch (error) {
      console.error("Error loading config file:", error);
      return;
    }
  } else {
    console.error("No config file provided. Please set a data-config attribute on the <script> tag.");
    return;
  }

  // ─── 2. If config.css_url is provided, inject a <link> to that CSS ─────────────
  if (config.css_url) {
    const linkEl = document.createElement('link');
    linkEl.rel = "stylesheet";
    linkEl.href = config.css_url;
    document.head.appendChild(linkEl);
  }

  // ─── 3. Generate a unique instanceId for this widget ───────────────────────────
  const instanceId = Math.random().toString(36).substr(2, 8);

  // ─── 4. Compute the aspect ratio (padding-bottom %) ────────────────────────────
  let aspectPercent = "100%";
  if (config.aspect) {
    if (config.aspect.includes(":")) {
      const parts = config.aspect.split(":");
      const w = parseFloat(parts[0]);
      const h = parseFloat(parts[1]);
      if (!isNaN(w) && !isNaN(h) && w > 0) {
        aspectPercent = (h / w * 100) + "%";
      }
    } else {
      const aspectValue = parseFloat(config.aspect);
      if (!isNaN(aspectValue) && aspectValue > 0) {
        aspectPercent = (100 / aspectValue) + "%";
      }
    }
  } else {
    const parentContainer = scriptTag.parentNode;
    const containerWidth  = parentContainer.offsetWidth;
    const containerHeight = parentContainer.offsetHeight;
    if (containerWidth > 0 && containerHeight > 0) {
      aspectPercent = (containerHeight / containerWidth * 100) + "%";
    }
  }

  // ─── 5. Create the widget container (no GIF preview, no close button) ───────────
  const widgetContainer = document.createElement('div');
  widgetContainer.id = 'ply-widget-container-' + instanceId;
  widgetContainer.classList.add('ply-widget-container');
  widgetContainer.style.height = "0";
  widgetContainer.style.paddingBottom = aspectPercent;
  widgetContainer.setAttribute('data-original-aspect', aspectPercent);

  // Add the 3D-viewer HTML + ⦿ toggle + tooltip + help HTML
  widgetContainer.innerHTML = `
    <div id="viewer-container-${instanceId}" class="viewer-container">
      <div id="progress-dialog-${instanceId}" class="progress-dialog">
        <progress id="progress-indicator-${instanceId}" max="100" value="0"></progress>
      </div>
      <button id="fullscreen-toggle-${instanceId}" class="widget-button fullscreen-toggle">⇱</button>
      <button id="help-toggle-${instanceId}" class="widget-button help-toggle">?</button>
      <button id="reset-camera-btn-${instanceId}" class="widget-button reset-camera-btn">
        <span class="reset-icon">⟲</span>
      </button>
      <button id="points-toggle-${instanceId}" class="widget-button points-toggle">⦿</button>
      <div id="menu-content-${instanceId}" class="menu-content">
        <span id="help-close-${instanceId}" class="help-close">×</span>
        <div class="help-text">
        </div>
      </div>
    </div>
    <div id="point-tooltip" class="point-tooltip" style="display: none;">
      <div class="point-tooltip-content">
        <span id="point-tooltip-close" class="point-tooltip-close">×</span>
        <div id="point-tooltip-text" class="point-tooltip-text"></div>
        <img id="point-tooltip-image" class="point-tooltip-image" src="" alt="" style="display: none;" />
      </div>
    </div>
  `;

  // Append the widget container immediately after the <script> tag
  scriptTag.parentNode.appendChild(widgetContainer);

  // ─── 6. Grab references to new DOM elements ──────────────────────────────────
  const viewerContainerElem = document.getElementById('viewer-container-' + instanceId);
  const fullscreenToggle    = document.getElementById('fullscreen-toggle-' + instanceId);
  const helpToggle          = document.getElementById('help-toggle-' + instanceId);
  const helpCloseBtn        = document.getElementById('help-close-' + instanceId);
  const resetCameraBtn      = document.getElementById('reset-camera-btn-' + instanceId);
  const pointsToggleBtn     = document.getElementById('points-toggle-' + instanceId);
  const menuContent         = document.getElementById('menu-content-' + instanceId);
  const helpTextDiv         = menuContent.querySelector('.help-text');

  // Tooltip elements
  const tooltipDiv       = document.getElementById('point-tooltip');
  const tooltipTextDiv   = document.getElementById('point-tooltip-text');
  const tooltipImage     = document.getElementById('point-tooltip-image');
  const tooltipCloseBtn  = document.getElementById('point-tooltip-close');

  // ─── 6a. Detect mobile vs. desktop ────────────────────────────────────────────
  const isIOS    = /iPad|iPhone|iPod/.test(navigator.userAgent) && !window.MSStream;
  const isMobile = isIOS || /Android/i.test(navigator.userAgent);

  // Conditionally include the French tooltip instruction line if points_url exists
  const tooltipInstruction = config.points_url
    ? '- Cliquez sur ⦿ pour afficher/masquer les points d’information.<br>'
    : '';

  // Fill help text with appropriate instructions
  if (isMobile) {
    helpTextDiv.innerHTML = `
      - Pour vous déplacer, glissez deux doigts sur l'écran.<br>
      - Pour orbiter, utilisez un doigt.<br>
      - Pour zoomer, pincez avec deux doigts.<br>
      ${tooltipInstruction}
    `;
  } else {
    helpTextDiv.innerHTML = `
      - orbitez avec le clic droit<br>
      - zoomez avec la molette<br>
      - déplacez vous avec le clic gauche<br>
      ${tooltipInstruction}
    `;
  }

  // Ensure instructions panel is visible by default
  menuContent.style.display = 'block';

  viewerContainerElem.style.display = 'block';

  // Variable to hold the drag-hide listener reference
  let dragHide = null;

  // Utility: hide tooltip and remove drag-hide listener
  function hideTooltip() {
    if (dragHide) {
      viewerContainerElem.removeEventListener('pointermove', dragHide);
      dragHide = null;
    }
    tooltipDiv.style.display = 'none';
  }

  // Utility: hide instructions panel
  function hideHelpPanel() {
    menuContent.style.display = 'none';
  }

  // ─── 7. Dynamically load viewer.js ─────────────────────────────────────────
  let viewerModule;
  try {
    viewerModule = await import('./viewer.js');
    await viewerModule.initializeViewer(config, instanceId);
  } catch (err) {
    console.error("Failed to load viewer.js or initialize the 3D viewer:", err);
    return;
  }

  // After viewer is ready, grab the canvas element
  const canvasId = 'canvas-' + instanceId;
  const canvasEl = document.getElementById(canvasId);

  // ─── 8. Conditional display of points-toggle button ─────────────────────────
  if (!config.points_url) {
    pointsToggleBtn.style.display = 'none';
  } else {
    fetch(config.points_url)
      .then(resp => {
        if (!resp.ok) {
          pointsToggleBtn.style.display = 'none';
        }
      })
      .catch(() => {
        pointsToggleBtn.style.display = 'none';
      });
  }

  // ─── 9. Fullscreen / state-preservation logic ───────────────────────────────
  let isFullscreen = false;
  let savedState = null;

  function saveCurrentState() {
    if (isFullscreen) return;
    const computedWidget = window.getComputedStyle(widgetContainer);
    const computedViewer = window.getComputedStyle(viewerContainerElem);
    const originalAspect = widgetContainer.getAttribute('data-original-aspect') || aspectPercent;
    const containerWidth  = widgetContainer.offsetWidth;
    const containerHeight = widgetContainer.clientHeight || viewerContainerElem.offsetHeight;
    const calculatedRatio = (containerHeight / containerWidth * 100) + '%';

    savedState = {
      widget: {
        position:     widgetContainer.style.position,
        top:          widgetContainer.style.top,
        left:         widgetContainer.style.left,
        width:        widgetContainer.style.width,
        height:       widgetContainer.style.height,
        maxWidth:     widgetContainer.style.maxWidth,
        maxHeight:    widgetContainer.style.maxHeight,
        paddingBottom: widgetContainer.style.paddingBottom || originalAspect,
        margin:       widgetContainer.style.margin,
        aspectPercent: originalAspect,
        calculatedAspect: calculatedRatio,
        computedWidth:    computedWidget.width,
        computedHeight:   computedWidget.height,
        offsetWidth:     containerWidth,
        offsetHeight:    containerHeight
      },
      viewer: {
        borderRadius: viewerContainerElem.style.borderRadius,
        border:       viewerContainerElem.style.border,
        computedWidth:  computedViewer.width,
        computedHeight: computedViewer.height
      }
    };
  }

  function restoreOriginalStyles() {
    if (!savedState) return;
    let aspectToUse = aspectPercent;
    if (savedState.widget.offsetWidth && savedState.widget.offsetHeight) {
      const actualRatio = (savedState.widget.offsetHeight / savedState.widget.offsetWidth * 100) + '%';
      aspectToUse = actualRatio;
    } else if (savedState.widget.calculatedAspect) {
      aspectToUse = savedState.widget.calculatedAspect;
    } else if (savedState.widget.aspectPercent) {
      aspectToUse = savedState.widget.aspectPercent;
    } else if (savedState.widget.paddingBottom) {
      aspectToUse = savedState.widget.paddingBottom;
    }

    widgetContainer.style.position     = savedState.widget.position    || "";
    widgetContainer.style.top          = savedState.widget.top         || "";
    widgetContainer.style.left         = savedState.widget.left        || "";
    widgetContainer.style.width        = "100%";
    widgetContainer.style.height       = "0";
    widgetContainer.style.maxWidth     = savedState.widget.maxWidth    || "";
    widgetContainer.style.maxHeight    = savedState.widget.maxHeight   || "";
    widgetContainer.style.paddingBottom= aspectToUse;
    widgetContainer.style.margin       = savedState.widget.margin      || "";
    widgetContainer.style.border       = savedState.widget.border      || "";
    widgetContainer.style.borderRadius = savedState.widget.borderRadius|| "";
    widgetContainer.style.overflow     = savedState.widget.overflow    || "";
    widgetContainer.classList.remove('fake-fullscreen');

    viewerContainerElem.style.position    = "absolute";
    viewerContainerElem.style.top         = "0";
    viewerContainerElem.style.left        = "0";
    viewerContainerElem.style.right       = "0";
    viewerContainerElem.style.bottom      = "0";
    viewerContainerElem.style.width       = "100%";
    viewerContainerElem.style.height      = "100%";
    viewerContainerElem.style.borderRadius= savedState.viewer.borderRadius || "";
    viewerContainerElem.style.border      = savedState.viewer.border       || "";

    if (viewerModule.app) {
      const cw = viewerContainerElem.clientWidth;
      const ch = viewerContainerElem.clientHeight;
      viewerModule.app.resizeCanvas(cw, ch);
    }

    savedState = null;
  }

  function applyFullscreenStyles() {
    widgetContainer.style.position     = 'fixed';
    widgetContainer.style.top          = '0';
    widgetContainer.style.left         = '0';
    widgetContainer.style.width        = '100vw';
    widgetContainer.style.height       = '100vh';
    widgetContainer.style.maxWidth     = '100vw';
    widgetContainer.style.maxHeight    = '100vh';
    widgetContainer.style.paddingBottom= '0';
    widgetContainer.style.margin       = '0';
    widgetContainer.style.border       = 'none';
    widgetContainer.style.borderRadius = '0';

    viewerContainerElem.style.width       = '100%';
    viewerContainerElem.style.height      = '100%';
    viewerContainerElem.style.borderRadius= '0';
    viewerContainerElem.style.border      = 'none';

    if (viewerModule.app) {
      viewerModule.app.resizeCanvas(window.innerWidth, window.innerHeight);
    }

    fullscreenToggle.textContent = '⇲';
    isFullscreen = true;
  }

  function enterFullscreen() {
    if (!savedState) {
      saveCurrentState();
    }
    if (isIOS) {
      applyFullscreenStyles();
      widgetContainer.classList.add('fake-fullscreen');
    } else {
      if (widgetContainer.requestFullscreen) {
        widgetContainer.requestFullscreen()
          .then(() => {
            applyFullscreenStyles();
          })
          .catch(err => {
            console.error("Fullscreen request failed:", err);
            applyFullscreenStyles();
            widgetContainer.classList.add('fake-fullscreen');
          });
      } else if (widgetContainer.webkitRequestFullscreen) {
        widgetContainer.webkitRequestFullscreen();
        applyFullscreenStyles();
      } else if (widgetContainer.mozRequestFullScreen) {
        widgetContainer.mozRequestFullScreen();
        applyFullscreenStyles();
      } else if (widgetContainer.msRequestFullscreen) {
        widgetContainer.msRequestFullscreen();
        applyFullscreenStyles();
      } else {
        applyFullscreenStyles();
        widgetContainer.classList.add('fake-fullscreen');
      }
    }
  }

  function exitFullscreen() {
    if (document.fullscreenElement === widgetContainer) {
      if (document.exitFullscreen) {
        document.exitFullscreen().catch(err => {
          console.error("Error exiting fullscreen:", err);
        });
      } else if (document.webkitExitFullscreen) {
        document.webkitExitFullscreen();
      } else if (document.mozCancelFullScreen) {
        document.mozCancelFullScreen();
      } else if (document.msExitFullscreen) {
        document.msExitFullscreen();
      }
    }

    widgetContainer.classList.remove('fake-fullscreen');
    restoreOriginalStyles();
    isFullscreen = false;
  }

  // ─── 10. Hook up event listeners ───────────────────────────────────────────

  fullscreenToggle.addEventListener('click', () => {
    hideTooltip();
    if (!isFullscreen) {
      enterFullscreen();
    } else {
      exitFullscreen();
    }
  });

  document.addEventListener('fullscreenchange', () => {
    if (document.fullscreenElement === widgetContainer) {
      isFullscreen = true;
      applyFullscreenStyles();
    } else if (isFullscreen) {
      isFullscreen = false;
      restoreOriginalStyles();
    }
  });
  document.addEventListener('webkitfullscreenchange', () => {
    if (document.webkitFullscreenElement === widgetContainer) {
      isFullscreen = true;
      applyFullscreenStyles();
    } else if (isFullscreen) {
      isFullscreen = false;
      restoreOriginalStyles();
    }
  });
  document.addEventListener('mozfullscreenchange', () => {
    if (document.mozFullScreenElement === widgetContainer) {
      isFullscreen = true;
      applyFullscreenStyles();
    } else if (isFullscreen) {
      isFullscreen = false;
      restoreOriginalStyles();
    }
  });
  document.addEventListener('MSFullscreenChange', () => {
    if (document.msFullscreenElement === widgetContainer) {
      isFullscreen = true;
      applyFullscreenStyles();
    } else if (isFullscreen) {
      isFullscreen = false;
      restoreOriginalStyles();
    }
  });

  helpToggle.addEventListener('click', (e) => {
    hideTooltip();
    e.stopPropagation();
    menuContent.style.display = (menuContent.style.display === 'block') ? 'none' : 'block';
  });

  helpCloseBtn.addEventListener('click', () => {
    hideHelpPanel();
  });

  resetCameraBtn.addEventListener('click', () => {
    hideTooltip();
    if (viewerModule.resetViewerCamera) {
      viewerModule.resetViewerCamera();
    }
  });

  // ⦿ toggle button
  let pointsVisible = !!config.showPointsDefault;
  if (pointsToggleBtn.style.display !== 'none') {
    if (!pointsVisible) {
      pointsToggleBtn.style.opacity = '0.5';
    }
    pointsToggleBtn.addEventListener('click', () => {
      hideTooltip();
      pointsVisible = !pointsVisible;
      pointsToggleBtn.style.opacity = pointsVisible ? '1' : '0.5';
      document.dispatchEvent(new CustomEvent('toggle-points', { detail: { visible: pointsVisible } }));
    });
  }

  // Close tooltip on button click
  tooltipCloseBtn.addEventListener('click', () => {
    hideTooltip();
  });

  // Listen for point-selection events and show tooltip
  document.addEventListener('point-selected', (evt) => {
    const { text, imageUrl } = evt.detail;
    tooltipTextDiv.textContent = text || "";
    if (imageUrl) {
      tooltipImage.src = imageUrl;
      tooltipImage.style.display = 'block';
    } else {
      tooltipImage.style.display = 'none';
    }
    tooltipDiv.style.display = 'flex';

    // Attach drag-based hide listener
    dragHide = (e) => {
      if ((e.pointerType === 'mouse' && e.buttons !== 0) ||
          (e.pointerType === 'touch')) {
        hideTooltip();
      }
    };
    viewerContainerElem.addEventListener('pointermove', dragHide);
  });

  // Hide on any wheel event (zoom)
  if (canvasEl) {
    canvasEl.addEventListener('wheel', () => {
      hideTooltip();
    }, { passive: true });
  }

  // Escape key also exits fullscreen
  document.addEventListener('keydown', (e) => {
    if ((e.key === 'Escape' || e.key === 'Esc') && isFullscreen) {
      exitFullscreen();
    }
  });

  // Window resize → resize PlayCanvas canvas
  window.addEventListener('resize', () => {
    if (isFullscreen && viewerModule.app) {
      viewerModule.app.resizeCanvas(window.innerWidth, window.innerHeight);
    } else if (viewerModule.app) {
      const cw = viewerContainerElem.clientWidth;
      const ch = viewerContainerElem.clientHeight;
      viewerModule.app.resizeCanvas(cw, ch);
    }
  });

  // Save “initial state” after a brief delay
  setTimeout(() => {
    saveCurrentState();
    document.dispatchEvent(new CustomEvent('toggle-points', { detail: { visible: pointsVisible } }));
  }, 200);

})();