(function initCanvasInputs(root) {
  function uniqueNonEmpty(values) {
    const seen = new Set();
    return (Array.isArray(values) ? values : []).filter((value) => {
      const normalized = typeof value === "string" ? value.trim() : "";
      if (!normalized || seen.has(normalized)) return false;
      seen.add(normalized);
      return true;
    });
  }

  function collectUpstreamOutputs(node, readNodeOutput) {
    const out = { text: "", image: "", images: [] };
    if (!node || !node.inputs || typeof readNodeOutput !== "function") return out;

    for (const key of Object.keys(node.inputs)) {
      const connections = (node.inputs[key] && node.inputs[key].connections) || [];
      for (const connection of connections) {
        const source = readNodeOutput(connection.node) || {};
        if (source.text && !out.text) out.text = String(source.text).trim();
        if (source.image) out.images.push(source.image);
      }
    }

    out.images = uniqueNonEmpty(out.images);
    out.image = out.images[0] || "";
    return out;
  }

  const api = { uniqueNonEmpty, collectUpstreamOutputs };
  if (typeof module !== "undefined" && module.exports) module.exports = api;
  root.CanvasInputs = api;
})(typeof window !== "undefined" ? window : globalThis);