"use strict";
var __defProp = Object.defineProperty;
var __getOwnPropDesc = Object.getOwnPropertyDescriptor;
var __getOwnPropNames = Object.getOwnPropertyNames;
var __hasOwnProp = Object.prototype.hasOwnProperty;
var __export = (target, all) => {
  for (var name in all)
    __defProp(target, name, { get: all[name], enumerable: true });
};
var __copyProps = (to, from, except, desc) => {
  if (from && typeof from === "object" || typeof from === "function") {
    for (let key of __getOwnPropNames(from))
      if (!__hasOwnProp.call(to, key) && key !== except)
        __defProp(to, key, { get: () => from[key], enumerable: !(desc = __getOwnPropDesc(from, key)) || desc.enumerable });
  }
  return to;
};
var __toCommonJS = (mod) => __copyProps(__defProp({}, "__esModule", { value: true }), mod);

// nip26.ts
var nip26_exports = {};
__export(nip26_exports, {
  createDelegation: () => createDelegation,
  getDelegator: () => getDelegator
});
module.exports = __toCommonJS(nip26_exports);
var import_secp256k12 = require("@noble/curves/secp256k1");
var import_utils2 = require("@noble/hashes/utils");
var import_sha256 = require("@noble/hashes/sha256");

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

// keys.ts
var import_secp256k1 = require("@noble/curves/secp256k1");
var import_utils = require("@noble/hashes/utils");
function getPublicKey(privateKey) {
  return (0, import_utils.bytesToHex)(import_secp256k1.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>${parameters.since}`);
  let cond = conditions.join("&");
  if (cond === "")
    throw new Error("refusing to create a delegation without any conditions");
  let sighash = (0, import_sha256.sha256)(utf8Encoder.encode(`nostr:delegation:${parameters.pubkey}:${cond}`));
  let sig = (0, import_utils2.bytesToHex)(import_secp256k12.schnorr.sign(sighash, privateKey));
  return {
    from: getPublicKey(privateKey),
    to: parameters.pubkey,
    cond,
    sig
  };
}
function getDelegator(event) {
  let tag = event.tags.find((tag2) => tag2[0] === "delegation" && tag2.length >= 4);
  if (!tag)
    return null;
  let pubkey = tag[1];
  let cond = tag[2];
  let sig = tag[3];
  let conditions = cond.split("&");
  for (let i = 0; i < conditions.length; i++) {
    let [key, operator, value] = conditions[i].split(/\b/);
    if (key === "kind" && operator === "=" && event.kind === parseInt(value))
      continue;
    else if (key === "created_at" && operator === "<" && event.created_at < parseInt(value))
      continue;
    else if (key === "created_at" && operator === ">" && event.created_at > parseInt(value))
      continue;
    else
      return null;
  }
  let sighash = (0, import_sha256.sha256)(utf8Encoder.encode(`nostr:delegation:${event.pubkey}:${cond}`));
  if (!import_secp256k12.schnorr.verify(sig, sighash, pubkey))
    return null;
  return pubkey;
}