1 files changed, 46 insertions, 0 deletions
diff --git a/apps/web/src/lib/editor-utils.ts b/apps/web/src/lib/editor-utils.ts
new file mode 100644
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--- /dev/null
+++ b/apps/web/src/lib/editor-utils.ts
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+import { CanvasSize } from "@/types/editor";
+
+const DEFAULT_CANVAS_PRESETS = [
+  { name: "16:9", width: 1920, height: 1080 },
+  { name: "9:16", width: 1080, height: 1920 },
+  { name: "1:1", width: 1080, height: 1080 },
+  { name: "4:3", width: 1440, height: 1080 },
+];
+
+/**
+ * Helper function to find the best matching canvas preset for an aspect ratio
+ * @param aspectRatio The target aspect ratio to match
+ * @returns The best matching canvas size
+ */
+export function findBestCanvasPreset(aspectRatio: number): CanvasSize {
+  // Calculate aspect ratio for each preset and find the closest match
+  let bestMatch = DEFAULT_CANVAS_PRESETS[0]; // Default to 16:9 HD
+  let smallestDifference = Math.abs(
+    aspectRatio - bestMatch.width / bestMatch.height
+  );
+
+  for (const preset of DEFAULT_CANVAS_PRESETS) {
+    const presetAspectRatio = preset.width / preset.height;
+    const difference = Math.abs(aspectRatio - presetAspectRatio);
+
+    if (difference < smallestDifference) {
+      smallestDifference = difference;
+      bestMatch = preset;
+    }
+  }
+
+  // If the difference is still significant (> 0.1), create a custom size
+  // based on the media aspect ratio with a reasonable resolution
+  const bestAspectRatio = bestMatch.width / bestMatch.height;
+  if (Math.abs(aspectRatio - bestAspectRatio) > 0.1) {
+    // Create custom dimensions based on the aspect ratio
+    if (aspectRatio > 1) {
+      // Landscape - use 1920 width
+      return { width: 1920, height: Math.round(1920 / aspectRatio) };
+    }
+    // Portrait or square - use 1080 height
+    return { width: Math.round(1080 * aspectRatio), height: 1080 };
+  }
+
+  return { width: bestMatch.width, height: bestMatch.height };
+}