// interface.js
// ==============================
// Robust version with iOS/Safari debug alerts
// ==============================

const currentScriptTag = document.currentScript;

function isIOSorSafari() {
  const ua = navigator.userAgent;
  return (
    /iPad|iPhone|iPod/.test(ua) ||
    (/Safari/.test(ua) && !/Chrome/.test(ua) && !/Android/.test(ua))
  );
}
function logAndAlert(msg) {
  console.log(msg);
  if (isIOSorSafari()) alert(msg);
}

(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];
    }
  }

  // Defensive fetch with CORS for config
  const configUrl = scriptTag.getAttribute('data-config');
  let config = {};
  if (configUrl) {
    try {
      logAndAlert("[interface.js] Fetching config: " + configUrl);
      const response = await fetch(configUrl, {mode: "cors"});
      config = await response.json();
      logAndAlert("[interface.js] Config loaded");
    } catch (error) {
      logAndAlert("Error loading config file: " + error);
      return;
    }
  } else {
    logAndAlert("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);

  // Conditionally include the “tooltips-toggle” button only if config.tooltips_url is defined
  const tooltipsButtonHTML = config.tooltips_url
    ? `<button id="tooltips-toggle-${instanceId}" class="widget-button tooltips-toggle">⦿</button>`
    : '';

  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>
      ${tooltipsButtonHTML}
      <div id="menu-content-${instanceId}" class="menu-content">
        <span id="help-close-${instanceId}" class="help-close">×</span>
        <div class="help-text"></div>
      </div>
    </div>
    <div id="tooltip-panel" class="tooltip-panel" style="display: none;">
      <div class="tooltip-content">
        <span id="tooltip-close" class="tooltip-close">×</span>
        <div id="tooltip-text" class="tooltip-text"></div>
        <img id="tooltip-image" class="tooltip-image" src="" alt="" style="display: none;" />
      </div>
    </div>
  `;

  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 tooltipsToggleBtn   = document.getElementById('tooltips-toggle-' + instanceId);
  const menuContent         = document.getElementById('menu-content-' + instanceId);
  const helpTextDiv         = menuContent.querySelector('.help-text');
  const tooltipPanel        = document.getElementById('tooltip-panel');
  const tooltipTextDiv      = document.getElementById('tooltip-text');
  const tooltipImage        = document.getElementById('tooltip-image');
  const tooltipCloseBtn     = document.getElementById('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 tooltips_url exists
  const tooltipInstruction = config.tooltips_url
    ? '- Cliquez sur ⦿ pour afficher/masquer les tooltips.<br>'
    : '';

  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}
      - ⟲ Réinitialise la caméra.<br>
      - ⇱ Passe en plein écran.<br>
    `;
  } else {
    helpTextDiv.innerHTML = `
      - orbitez avec le clic droit<br>
      - zoomez avec la molette<br>
      - déplacez vous avec le clic gauche<br>
      ${tooltipInstruction}
      - ⟲ Réinitialise la caméra.<br>
      - ⇱ Passe en plein écran.<br>
    `;
  }

  menuContent.style.display = 'block';
  viewerContainerElem.style.display = 'block';

  let dragHide = null;
  function hideTooltipPanel() {
    if (dragHide) {
      viewerContainerElem.removeEventListener('pointermove', dragHide);
      dragHide = null;
    }
    tooltipPanel.style.display = 'none';
  }
  function hideHelpPanel() { menuContent.style.display = 'none'; }

  // ─── 7. Dynamically load viewer.js ─────────────────────────────
  let viewerModule;
  try {
    logAndAlert("[interface.js] Loading viewer.js...");
    viewerModule = await import('https://mikafil-viewer-gs.static.hf.space/viewer.js');
    await viewerModule.initializeViewer(config, instanceId);
    logAndAlert("[interface.js] viewer.js initialized.");
  } catch (err) {
    logAndAlert("Failed to load viewer.js or initialize the 3D viewer: " + err);
    return;
  }

  const canvasId = 'canvas-' + instanceId;
  const canvasEl = document.getElementById(canvasId);

  // ─── 8. Conditional display of tooltips-toggle button ─────────
  if (tooltipsToggleBtn) {
    if (!config.tooltips_url) {
      tooltipsToggleBtn.style.display = 'none';
    } else {
      // Defensive CORS for tooltips.json
      fetch(config.tooltips_url, {mode:"cors"})
        .then(resp => { if (!resp.ok) tooltipsToggleBtn.style.display = 'none'; })
        .catch(() => { tooltipsToggleBtn.style.display = 'none'; });
    }
  }

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

  function saveCurrentState() {
    if (isFullscreen) return;
    const originalAspect = widgetContainer.getAttribute('data-original-aspect') || aspectPercent;
    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,
      },
      viewer: {
        borderRadius: viewerContainerElem.style.borderRadius,
        border:       viewerContainerElem.style.border,
      }
    };
  }

  function restoreOriginalStyles() {
    if (!savedState) return;
    const 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.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) {
      viewerModule.app.resizeCanvas(
        viewerContainerElem.clientWidth,
        viewerContainerElem.clientHeight
      );
    }
    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(() => {
          applyFullscreenStyles();
          widgetContainer.classList.add('fake-fullscreen');
        });
    } else {
      applyFullscreenStyles();
      widgetContainer.classList.add('fake-fullscreen');
    }
  }

  function exitFullscreen() {
    if (document.fullscreenElement === widgetContainer && document.exitFullscreen) {
      document.exitFullscreen().catch(() => {});
    }
    widgetContainer.classList.remove('fake-fullscreen');
    restoreOriginalStyles();
    isFullscreen = false;
  }

  // ─── 10. Hook up event listeners ──────────────
  fullscreenToggle.addEventListener('click', () => {
    hideTooltipPanel();
    isFullscreen ? exitFullscreen() : enterFullscreen();
  });
  document.addEventListener('fullscreenchange', () => {
    if (!document.fullscreenElement && isFullscreen) {
      isFullscreen = false;
      restoreOriginalStyles();
    }
  });

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

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

  if (tooltipsToggleBtn) {
    let tooltipsVisible = !!config.showTooltipsDefault;
    tooltipsToggleBtn.style.opacity = tooltipsVisible ? '1' : '0.5';
    tooltipsToggleBtn.addEventListener('click', () => {
      hideTooltipPanel();
      tooltipsVisible = !tooltipsVisible;
      tooltipsToggleBtn.style.opacity = tooltipsVisible ? '1' : '0.5';
      document.dispatchEvent(new CustomEvent('toggle-tooltips', { detail: { visible: tooltipsVisible } }));
    });
  }

  tooltipCloseBtn.addEventListener('click', hideTooltipPanel);

  document.addEventListener('tooltip-selected', (evt) => {
    const { title, description, imgUrl } = evt.detail;
    tooltipTextDiv.innerHTML = `<strong>${title}</strong><br>${description}`;
    if (imgUrl) {
      tooltipImage.src = imgUrl;
      tooltipImage.style.display = 'block';
    } else {
      tooltipImage.style.display = 'none';
    }
    tooltipPanel.style.display = 'flex';
    dragHide = (e) => {
      if ((e.pointerType === 'mouse' && e.buttons !== 0) || e.pointerType === 'touch') {
        hideTooltipPanel();
      }
    };
    viewerContainerElem.addEventListener('pointermove', dragHide);
  });

  if (canvasEl) {
    canvasEl.addEventListener('wheel', hideTooltipPanel, { passive: true });
  }
  document.addEventListener('keydown', (e) => {
    if ((e.key === 'Escape' || e.key === 'Esc') && isFullscreen) exitFullscreen();
  });
  window.addEventListener('resize', () => {
    if (viewerModule.app) {
      if (isFullscreen) {
        viewerModule.app.resizeCanvas(window.innerWidth, window.innerHeight);
      } else {
        viewerModule.app.resizeCanvas(
          viewerContainerElem.clientWidth,
          viewerContainerElem.clientHeight
        );
      }
    }
  });

  setTimeout(() => {
    saveCurrentState();
    document.dispatchEvent(new CustomEvent('toggle-tooltips', { detail: { visible: !!config.showTooltipsDefault } }));
  }, 200);

})();