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/**
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 * Guess a Content-Type from a filename based on extension.
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 * This is used for inline media preview in the UI (images, PDFs, etc.).
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 * Defaults to application/octet-stream when unknown.
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 */
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export function getContentTypeFromName(name: string): string {
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  const ext = (name.split(".").pop() || "").toLowerCase();
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  switch (ext) {
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    case "png":
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      return "image/png";
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    case "jpg":
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    case "jpeg":
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      return "image/jpeg";
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    case "gif":
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      return "image/gif";
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    case "webp":
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      return "image/webp";
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    case "bmp":
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      return "image/bmp";
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    case "ico":
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      return "image/x-icon";
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    case "svg":
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      return "image/svg+xml";
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    case "pdf":
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      return "application/pdf";
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    case "txt":
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      return "text/plain; charset=utf-8";
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    default:
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      return "application/octet-stream";
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  }
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}