import { PublicKey } from "@solana/web3.js";
import { BinaryReader, BinaryWriter } from "borsh";

export const extendBorsh = () => {
  (BinaryReader.prototype as any).readPubkey = function () {
    const reader = this as unknown as BinaryReader;
    const array = reader.readFixedArray(32);
    return new PublicKey(array);
  };

  (BinaryWriter.prototype as any).writePubkey = function (value: PublicKey) {
    const writer = this as unknown as BinaryWriter;
    writer.writeFixedArray(value.toBuffer());
  };

  // BTreeMap<u32, u32>
  (BinaryReader.prototype as any).readMap32 = function () {
    const reader = this as unknown as BinaryReader;
    const map = new Map();
    const length = reader.readU32();
    for (let i = 0; i < length; i++) {
      const key = reader.readU32();
      const val = reader.readU32();
      map.set(key, val);
    }
    return map;
  };

  // BTreeMap<u32, u32>
  (BinaryWriter.prototype as any).writeMap32 = function (
    value: Map<number, number>
  ) {
    const writer = this as unknown as BinaryWriter;
    value.forEach((val, key) => {
      writer.writeU32(key);
      writer.writeU32(val);
    });
  };
};

extendBorsh();