// nip26.ts
import { schnorr as schnorr2 } from "@noble/curves/secp256k1";
import { bytesToHex as bytesToHex2 } from "@noble/hashes/utils";
import { sha256 } from "@noble/hashes/sha256";

// utils.ts
var utf8Decoder = new TextDecoder("utf-8");
var utf8Encoder = new TextEncoder();

// keys.ts
import { schnorr } from "@noble/curves/secp256k1";
import { bytesToHex } from "@noble/hashes/utils";
function getPublicKey(privateKey) {
  return bytesToHex(schnorr.getPublicKey(privateKey));
}

// nip26.ts
function createDelegation(privateKey, parameters) {
  let conditions = [];
  if ((parameters.kind || -1) >= 0)
    conditions.push(`kind=${parameters.kind}`);
  if (parameters.until)
    conditions.push(`created_at<${parameters.until}`);
  if (parameters.since)
    conditions.push(`created_at>${parameters.since}`);
  let cond = conditions.join("&");
  if (cond === "")
    throw new Error("refusing to create a delegation without any conditions");
  let sighash = sha256(utf8Encoder.encode(`nostr:delegation:${parameters.pubkey}:${cond}`));
  let sig = bytesToHex2(schnorr2.sign(sighash, privateKey));
  return {
    from: getPublicKey(privateKey),
    to: parameters.pubkey,
    cond,
    sig
  };
}
function getDelegator(event) {
  let tag = event.tags.find((tag2) => tag2[0] === "delegation" && tag2.length >= 4);
  if (!tag)
    return null;
  let pubkey = tag[1];
  let cond = tag[2];
  let sig = tag[3];
  let conditions = cond.split("&");
  for (let i = 0; i < conditions.length; i++) {
    let [key, operator, value] = conditions[i].split(/\b/);
    if (key === "kind" && operator === "=" && event.kind === parseInt(value))
      continue;
    else if (key === "created_at" && operator === "<" && event.created_at < parseInt(value))
      continue;
    else if (key === "created_at" && operator === ">" && event.created_at > parseInt(value))
      continue;
    else
      return null;
  }
  let sighash = sha256(utf8Encoder.encode(`nostr:delegation:${event.pubkey}:${cond}`));
  if (!schnorr2.verify(sig, sighash, pubkey))
    return null;
  return pubkey;
}
export {
  createDelegation,
  getDelegator
};