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/*
 * Copyright (C) 2018 The DNA Authors
 * This file is part of The DNA library.
 *
 *  The DNA is free software: you can redistribute it and/or modify
 *  it under the terms of the GNU Lesser General Public License as published by
 *  the Free Software Foundation, either version 3 of the License, or
 *  (at your option) any later version.
 *
 *  The DNA is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU Lesser General Public License for more details.
 *
 *  You should have received a copy of the GNU Lesser General Public License
 *  along with The DNA.  If not, see .
 *
 */

package com.github.DNAProject.common;

import com.alibaba.fastjson.JSON;

/**
 * Custom type which inherits base class defines 32-bit data,
 * it mostly used to defined transaction identity
 */
public class UInt256 extends UIntBase implements Comparable {
    public static final UInt256 ZERO = new UInt256();

    public UInt256() {
        this(null);
    }

    public UInt256(byte[] value) {
        super(32, value);
    }


    public static UInt256 parse(String s) {
        if (s == null) {
            throw new NullPointerException();
        }
        if (s.startsWith("0x")) {
            s = s.substring(2);
        }
        if (s.length() != 64) {
            throw new IllegalArgumentException(ErrorCode.ParamLengthErr);
        }
        byte[] v = Helper.hexToBytes(s);
//        return new UInt256(v);
        return new UInt256(Helper.reverse(v));
    }

    public static boolean tryParse(String s, UInt256 result) {
        try {
            UInt256 v = parse(s);
            result.data_bytes = v.data_bytes;
            return true;
        } catch (Exception e) {
            return false;
        }
    }

    @Override
    public int compareTo(UInt256 other) {
        byte[] x = this.data_bytes;
        byte[] y = other.data_bytes;
        for (int i = x.length - 1; i >= 0; i--) {
            int r = Byte.toUnsignedInt(x[i]) - Byte.toUnsignedInt(y[i]);
            if (r != 0) {
                return r;
            }
        }
        return 0;
    }
}