(function () {
  function escapeHtml(value) {
    return String(value === undefined || value === null ? '' : value)
      .replace(/&/g, '&')
      .replace(/</g, '&lt;')
      .replace(/>/g, '&gt;')
      .replace(/"/g, '&quot;')
      .replace(/'/g, '&#39;');
  }

  function valueOrDefault(value, fallback) {
    return value === undefined || value === null || value === '' ? fallback : value;
  }

  function normalizeLockRatio(value) {
    var raw = String(value || '').trim();
    if (!raw) {
      return '';
    }
    if (!/^\d+\s*:\s*\d+$/.test(raw)) {
      return '';
    }
    return raw.replace(/\s+/g, '');
  }

  function parseLockRatio(value) {
    var normalized = normalizeLockRatio(value);
    if (!normalized) {
      return null;
    }

    var parts = normalized.split(':');
    var width = Number(parts[0]);
    var height = Number(parts[1]);
    if (!Number.isFinite(width) || !Number.isFinite(height) || width <= 0 || height <= 0) {
      return null;
    }

    return {
      label: normalized,
      ratio: width / height
    };
  }

  function getDefaultRegionSize(regionType, lockRatio) {
    var ratio = parseLockRatio(lockRatio);
    var locked = regionType === 'image' || regionType === 'webpage' || regionType === 'html' || regionType === 'rtmp' || regionType === 'rss' || regionType === 'api';

    if (ratio) {
      if (ratio.ratio >= 1) {
        var baseWidth = locked ? 420 : 300;
        return {
          width: Math.max(12, Math.round(baseWidth)),
          height: Math.max(12, Math.round(baseWidth / ratio.ratio))
        };
      }

      var baseHeight = locked ? 300 : 240;
      return {
        width: Math.max(12, Math.round(baseHeight * ratio.ratio)),
        height: Math.max(12, Math.round(baseHeight))
      };
    }

    return {
      width: locked ? 420 : 300,
      height: locked ? 240 : 120
    };
  }

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

  function getRegionName(card) {
    return String(card.querySelector('[name="region_name[]"]').value || '').trim();
  }

  function syncRegionIdentity(card, value) {
    var next = String(value || '').trim();
    card.querySelector('[name="region_name[]"]').value = next;
    card.querySelector('[name="region_key[]"]').value = next;
    card.querySelector('[name="region_label[]"]').value = next;
  }

  function readCard(card) {
    var name = getRegionName(card);
    return {
      region_key: name,
      label: name,
      region_type: card.querySelector('[name="region_type[]"]').value,
      font_family: card.querySelector('[name="font_family[]"]').value,
      lock_ratio: normalizeLockRatio(card.querySelector('[name="region_lock_ratio[]"]').value),
      x: Number(card.querySelector('[name="region_x[]"]').value || 0),
      y: Number(card.querySelector('[name="region_y[]"]').value || 0),
      width: Number(card.querySelector('[name="region_width[]"]').value || 0),
      height: Number(card.querySelector('[name="region_height[]"]').value || 0),
      z_index: Number(card.querySelector('[name="region_z[]"]').value || 0)
    };
  }

  function writeCard(card, values) {
    if (values.region_name !== undefined) {
      syncRegionIdentity(card, values.region_name);
    } else if (values.region_key !== undefined) {
      syncRegionIdentity(card, values.region_key);
    } else if (values.label !== undefined) {
      syncRegionIdentity(card, values.label);
    }
    if (values.region_type !== undefined) { card.querySelector('[name="region_type[]"]').value = values.region_type; }
    if (values.font_family !== undefined) { card.querySelector('[name="font_family[]"]').value = values.font_family; }
    if (values.lock_ratio !== undefined) { card.querySelector('[name="region_lock_ratio[]"]').value = normalizeLockRatio(values.lock_ratio); }
    if (values.x !== undefined) { card.querySelector('[name="region_x[]"]').value = Math.round(values.x); }
    if (values.y !== undefined) { card.querySelector('[name="region_y[]"]').value = Math.round(values.y); }
    if (values.width !== undefined) { card.querySelector('[name="region_width[]"]').value = Math.round(values.width); }
    if (values.height !== undefined) { card.querySelector('[name="region_height[]"]').value = Math.round(values.height); }
    if (values.z_index !== undefined) { card.querySelector('[name="region_z[]"]').value = Math.round(values.z_index); }
  }

  function clampRegion(region, size, minSize) {
    var bounds = size || { width: 1920, height: 1080 };
    var minimum = minSize || 12;
    var x = clamp(region.x, 0, bounds.width - minimum);
    var y = clamp(region.y, 0, bounds.height - minimum);
    var width = Math.max(minimum, region.width);
    var height = Math.max(minimum, region.height);
    if (x + width > bounds.width) {
      width = bounds.width - x;
    }
    if (y + height > bounds.height) {
      height = bounds.height - y;
    }
    return { x: Math.round(x), y: Math.round(y), width: Math.round(Math.max(minimum, width)), height: Math.round(Math.max(minimum, height)) };
  }

  function getOverlayRect(overlay) {
    return overlay.getBoundingClientRect();
  }

  function toCanvasPoint(event, overlay, size) {
    var rect = getOverlayRect(overlay);
    var canvasSize = size || { width: 1920, height: 1080 };
    var x = clamp(event.clientX - rect.left, 0, rect.width);
    var y = clamp(event.clientY - rect.top, 0, rect.height);
    return {
      x: Math.round((x / Math.max(rect.width, 1)) * canvasSize.width),
      y: Math.round((y / Math.max(rect.height, 1)) * canvasSize.height)
    };
  }

  function canvasRectToPixels(region, overlay, size) {
    var rect = getOverlayRect(overlay);
    var canvasSize = size || { width: 1920, height: 1080 };
    return {
      left: (region.x / canvasSize.width) * rect.width,
      top: (region.y / canvasSize.height) * rect.height,
      width: (region.width / canvasSize.width) * rect.width,
      height: (region.height / canvasSize.height) * rect.height
    };
  }

  window.templateDesignerUtils = {
    escapeHtml: escapeHtml,
    valueOrDefault: valueOrDefault,
    clamp: clamp,
    getRegionName: getRegionName,
    syncRegionIdentity: syncRegionIdentity,
    readCard: readCard,
    writeCard: writeCard,
    clampRegion: clampRegion,
    getOverlayRect: getOverlayRect,
    toCanvasPoint: toCanvasPoint,
    canvasRectToPixels: canvasRectToPixels,
    normalizeLockRatio: normalizeLockRatio,
    parseLockRatio: parseLockRatio,
    getDefaultRegionSize: getDefaultRegionSize
  };
}());