/*
 * Copyright (c) 2017-2018 PlayerOne.
 *
 * The MIT License
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in all
 * copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 */
package io.fio.sdk.utils;

import io.fio.sdk.crypto.CurveParam;
import io.fio.sdk.crypto.EcTools;
import io.fio.sdk.crypto.EosEcUtil;
import io.fio.sdk.crypto.Ripemd160;

import java.util.Arrays;



/**
 * Created by swapnibble on 2017-09-25.
 */

public class EosPublicKey {
    private static final String LEGACY_PREFIX = "EOS";
    private static final String PREFIX = "PUB";

    private static final int CHECK_BYTE_LEN = 4;

    private final long mCheck;
    private final CurveParam mCurveParam;
    private final byte[] mData;

    public static class IllegalEosPubkeyFormatException extends IllegalArgumentException {
        public IllegalEosPubkeyFormatException(String pubkeyStr) {
            super("invalid eos public key : " + pubkeyStr);
        }
    }

    public EosPublicKey(byte[] data ){
        this( data, EcTools.getCurveParam( CurveParam.SECP256_K1));
    }

    public EosPublicKey(byte[] data, CurveParam curveParam ){
        mData = Arrays.copyOf(data, 33);
        mCurveParam = curveParam;

        mCheck= BitUtils.uint32ToLong( Ripemd160.from( mData, 0, mData.length).bytes(), 0 );
    }

    public EosPublicKey(String base58Str) {
        RefValue<Long> checksumRef = new RefValue<>();

        String[] parts = EosEcUtil.safeSplitEosCryptoString( base58Str );
        if ( base58Str.startsWith(LEGACY_PREFIX) ) {
            if ( parts.length == 1 ){
                mCurveParam = EcTools.getCurveParam( CurveParam.SECP256_K1);
                mData = EosEcUtil.getBytesIfMatchedRipemd160( base58Str.substring( LEGACY_PREFIX.length()), null, checksumRef);
            }
            else {
                throw new IllegalEosPubkeyFormatException( base58Str );
            }
        }
        else {
            if ( parts.length < 3 ) {
                throw new IllegalEosPubkeyFormatException( base58Str );
            }

            // [0]: prefix, [1]: curve type, [2]: data
            if ( false == PREFIX.equals( parts[0]) ) throw new IllegalEosPubkeyFormatException( base58Str );

            mCurveParam = EosEcUtil.getCurveParamFrom( parts[1]);
            mData = EosEcUtil.getBytesIfMatchedRipemd160( parts[2], parts[1], checksumRef);
        }

        mCheck = checksumRef.data;
    }

    public byte[] getBytes() {
        return mData;
    }


    @Override
    public String toString() {

        boolean isR1 = mCurveParam.isType( CurveParam.SECP256_R1 );

        return EosEcUtil.encodeEosCrypto( isR1 ? PREFIX : LEGACY_PREFIX, isR1 ? mCurveParam : null, mData );

//        byte[] postfixBytes = isR1 ? EosEcUtil.PREFIX_R1.getBytes() : new byte[0] ;
//        byte[] toDigest = new byte[mData.length + postfixBytes.length];
//        System.arraycopy( mData, 0, toDigest, 0, mData.length);
//
//        if ( postfixBytes.length > 0) {
//            System.arraycopy(postfixBytes, 0, toDigest, mData.length, postfixBytes.length);
//        }
//
//        byte[] digest = Ripemd160.from( toDigest ).bytes();
//        byte[] result = new byte[ CHECK_BYTE_LEN + mData.length];
//
//        System.arraycopy( mData, 0, result, 0, mData.length);
//        System.arraycopy( digest, 0, result, mData.length, CHECK_BYTE_LEN);
//
//        if ( isR1 ){
//            return EosEcUtil.concatEosCryptoStr(PREFIX , EosEcUtil.PREFIX_R1, Base58.encode( result ) );
//        }
//        else {
//            return LEGACY_PREFIX + Base58.encode( result ) ;
//        }
    }

    @Override
    public int hashCode(){
        return (int)(mCheck & 0xFFFFFFFFL );
    }

    @Override
    public boolean equals(Object other) {
        if ( this == other ) return true;

        if ( null == other || getClass() != other.getClass())
            return false;

        return BitUtils.areEqual( this.mData, ((EosPublicKey)other).mData);
    }

    public boolean isCurveParamK1() {
        return ( mCurveParam == null || CurveParam.SECP256_K1 == mCurveParam.getCurveParamType() );
    }
}