// nip19.ts
import { bytesToHex, concatBytes, hexToBytes } from "@noble/hashes/utils";
import { bech32 } from "@scure/base";

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

// nip19.ts
var Bech32MaxSize = 5e3;
var BECH32_REGEX = /[\x21-\x7E]{1,83}1[023456789acdefghjklmnpqrstuvwxyz]{6,}/;
function integerToUint8Array(number) {
  const uint8Array = new Uint8Array(4);
  uint8Array[0] = number >> 24 & 255;
  uint8Array[1] = number >> 16 & 255;
  uint8Array[2] = number >> 8 & 255;
  uint8Array[3] = number & 255;
  return uint8Array;
}
function decode(nip19) {
  let { prefix, words } = bech32.decode(nip19, Bech32MaxSize);
  let data = new Uint8Array(bech32.fromWords(words));
  switch (prefix) {
    case "nprofile": {
      let tlv = parseTLV(data);
      if (!tlv[0]?.[0])
        throw new Error("missing TLV 0 for nprofile");
      if (tlv[0][0].length !== 32)
        throw new Error("TLV 0 should be 32 bytes");
      return {
        type: "nprofile",
        data: {
          pubkey: bytesToHex(tlv[0][0]),
          relays: tlv[1] ? tlv[1].map((d) => utf8Decoder.decode(d)) : []
        }
      };
    }
    case "nevent": {
      let tlv = parseTLV(data);
      if (!tlv[0]?.[0])
        throw new Error("missing TLV 0 for nevent");
      if (tlv[0][0].length !== 32)
        throw new Error("TLV 0 should be 32 bytes");
      if (tlv[2] && tlv[2][0].length !== 32)
        throw new Error("TLV 2 should be 32 bytes");
      if (tlv[3] && tlv[3][0].length !== 4)
        throw new Error("TLV 3 should be 4 bytes");
      return {
        type: "nevent",
        data: {
          id: bytesToHex(tlv[0][0]),
          relays: tlv[1] ? tlv[1].map((d) => utf8Decoder.decode(d)) : [],
          author: tlv[2]?.[0] ? bytesToHex(tlv[2][0]) : void 0,
          kind: tlv[3]?.[0] ? parseInt(bytesToHex(tlv[3][0]), 16) : void 0
        }
      };
    }
    case "naddr": {
      let tlv = parseTLV(data);
      if (!tlv[0]?.[0])
        throw new Error("missing TLV 0 for naddr");
      if (!tlv[2]?.[0])
        throw new Error("missing TLV 2 for naddr");
      if (tlv[2][0].length !== 32)
        throw new Error("TLV 2 should be 32 bytes");
      if (!tlv[3]?.[0])
        throw new Error("missing TLV 3 for naddr");
      if (tlv[3][0].length !== 4)
        throw new Error("TLV 3 should be 4 bytes");
      return {
        type: "naddr",
        data: {
          identifier: utf8Decoder.decode(tlv[0][0]),
          pubkey: bytesToHex(tlv[2][0]),
          kind: parseInt(bytesToHex(tlv[3][0]), 16),
          relays: tlv[1] ? tlv[1].map((d) => utf8Decoder.decode(d)) : []
        }
      };
    }
    case "nrelay": {
      let tlv = parseTLV(data);
      if (!tlv[0]?.[0])
        throw new Error("missing TLV 0 for nrelay");
      return {
        type: "nrelay",
        data: utf8Decoder.decode(tlv[0][0])
      };
    }
    case "nsec":
    case "npub":
    case "note":
      return { type: prefix, data: bytesToHex(data) };
    default:
      throw new Error(`unknown prefix ${prefix}`);
  }
}
function parseTLV(data) {
  let result = {};
  let rest = data;
  while (rest.length > 0) {
    let t = rest[0];
    let l = rest[1];
    if (!l)
      throw new Error(`malformed TLV ${t}`);
    let v = rest.slice(2, 2 + l);
    rest = rest.slice(2 + l);
    if (v.length < l)
      throw new Error(`not enough data to read on TLV ${t}`);
    result[t] = result[t] || [];
    result[t].push(v);
  }
  return result;
}
function nsecEncode(hex) {
  return encodeBytes("nsec", hex);
}
function npubEncode(hex) {
  return encodeBytes("npub", hex);
}
function noteEncode(hex) {
  return encodeBytes("note", hex);
}
function encodeBech32(prefix, data) {
  let words = bech32.toWords(data);
  return bech32.encode(prefix, words, Bech32MaxSize);
}
function encodeBytes(prefix, hex) {
  let data = hexToBytes(hex);
  return encodeBech32(prefix, data);
}
function nprofileEncode(profile) {
  let data = encodeTLV({
    0: [hexToBytes(profile.pubkey)],
    1: (profile.relays || []).map((url) => utf8Encoder.encode(url))
  });
  return encodeBech32("nprofile", data);
}
function neventEncode(event) {
  let kindArray;
  if (event.kind != void 0) {
    kindArray = integerToUint8Array(event.kind);
  }
  let data = encodeTLV({
    0: [hexToBytes(event.id)],
    1: (event.relays || []).map((url) => utf8Encoder.encode(url)),
    2: event.author ? [hexToBytes(event.author)] : [],
    3: kindArray ? [new Uint8Array(kindArray)] : []
  });
  return encodeBech32("nevent", data);
}
function naddrEncode(addr) {
  let kind = new ArrayBuffer(4);
  new DataView(kind).setUint32(0, addr.kind, false);
  let data = encodeTLV({
    0: [utf8Encoder.encode(addr.identifier)],
    1: (addr.relays || []).map((url) => utf8Encoder.encode(url)),
    2: [hexToBytes(addr.pubkey)],
    3: [new Uint8Array(kind)]
  });
  return encodeBech32("naddr", data);
}
function nrelayEncode(url) {
  let data = encodeTLV({
    0: [utf8Encoder.encode(url)]
  });
  return encodeBech32("nrelay", data);
}
function encodeTLV(tlv) {
  let entries = [];
  Object.entries(tlv).forEach(([t, vs]) => {
    vs.forEach((v) => {
      let entry = new Uint8Array(v.length + 2);
      entry.set([parseInt(t)], 0);
      entry.set([v.length], 1);
      entry.set(v, 2);
      entries.push(entry);
    });
  });
  return concatBytes(...entries);
}
export {
  BECH32_REGEX,
  decode,
  naddrEncode,
  neventEncode,
  noteEncode,
  nprofileEncode,
  npubEncode,
  nrelayEncode,
  nsecEncode
};