package com.sunyard.sge.database;

import com.sunyard.SydApiException;
import com.sunyard.proto.Util;

import java.nio.ByteBuffer;

public class SydSM4Backup implements ISM4 {

    private SydApi api;
    private int iKeyIndex;
    private byte[] pcdataResult = new byte[0];
    private int iPkgNum = 1;
    private int iFlag;
    private boolean is_finished = false;
    private byte[] dataResult = new byte[0];

    ByteBuffer sourceWrap = ByteBuffer.wrap(new byte[0]);


    public SydSM4Backup(SydApi api, int iKeyIndex, int endeFlag) {
        this.api = api;
        this.iFlag = endeFlag;
        this.iKeyIndex = iKeyIndex;
    }

    public byte[] update(byte[] pcData) {
        this.pcdataResult = pcData;
//        this.dataResult = pcData;
        if (null == pcData || pcData.length == 0) {
            return new byte[0];
        }
        int plength = pcData.length;
        if (is_finished) {
            throw new SydApiException(0);
        }
        if (plength > 4064) {
            throw new SydApiException(0);
        }
        if (iFlag == 1) {
        if (0 == sourceWrap.array().length) {
                //加密
                if (plength < 16) {
                    ByteBuffer bufferResult = ByteBuffer.allocate(sourceWrap.array().length + plength);
                    bufferResult.put(sourceWrap);
                    bufferResult.put(pcData);
                    sourceWrap = bufferResult;
                    return new byte[0];
                }
                if (plength % 16 != 0) {
                    ByteBuffer buffer = ByteBuffer.wrap(pcData);
                    int remainder = plength % 16;
                    int intercept = plength - remainder;
                    byte[] bytes = new byte[intercept];
                    ByteBuffer byteBuffer = buffer.get(bytes, 0, intercept);
                    byte[] bytes1 = new byte[remainder];
                    byteBuffer.get(bytes1);
                    this.pcdataResult = bytes;
                    ByteBuffer bufferResult = ByteBuffer.allocate(sourceWrap.array().length + remainder);
                    bufferResult.put(bytes1);
                    sourceWrap = bufferResult;
                }
                byte[] bytes = api.SYD_SM4_LongData(iKeyIndex, pcdataResult, iPkgNum, iFlag);
                iPkgNum = 2;
                return bytes;

            } else {
                if (16 > pcData.length + sourceWrap.array().length) {
                    ByteBuffer bufferResult = ByteBuffer.allocate(sourceWrap.array().length + plength);
                    bufferResult.put(sourceWrap.array());
                    bufferResult.put(pcData);
                    sourceWrap = bufferResult;
                    return new byte[0];
                } else if ((pcData.length + sourceWrap.array().length) % 16 == 0) {
                    ByteBuffer bufferResult = ByteBuffer.allocate(sourceWrap.array().length + plength);
                    bufferResult.put(sourceWrap.array());
                    bufferResult.put(pcData);
                    byte[] bytes = SydSM4Mac.bytebuffer2ByteArray(bufferResult);
                    byte[] bytes1 = api.SYD_SM4_LongData(iKeyIndex, bytes, iPkgNum, iFlag);
                    iPkgNum = 2;
                    return bytes1;
                } else {
                    ByteBuffer bufferResult = ByteBuffer.allocate(sourceWrap.array().length + plength);
                    bufferResult.put(sourceWrap.array());
                    bufferResult.put(pcData);
                    byte[] bytes = SydSM4Mac.bytebuffer2ByteArray(bufferResult);
                    ByteBuffer buffer = ByteBuffer.wrap(bytes);
                    int remainder = bytes.length % 16;
                    int intercept = bytes.length - remainder;
                    byte[] pcdataByte = new byte[intercept];
                    ByteBuffer byteBuffer = buffer.get(pcdataByte, 0, intercept);
                    byte[] bytes1 = new byte[remainder];
                    byteBuffer.get(bytes1);
                    this.pcdataResult = pcdataByte;
                    ByteBuffer bufferResults = ByteBuffer.allocate(remainder);
                    bufferResults.put(bytes1);
                    sourceWrap = bufferResults;

                    byte[] bytes2 = api.SYD_SM4_LongData(iKeyIndex, pcdataResult, iPkgNum, iFlag);
                    iPkgNum = 2;
                    return bytes2;
                }
            }
        }
        else {
            ByteBuffer nSourceWrap = ByteBuffer.allocate( sourceWrap.array().length + pcData.length );
            byte[] waitData = sourceWrap.array();
            nSourceWrap.put( waitData );
            nSourceWrap.put( pcData );
            sourceWrap = nSourceWrap;

            System.out.println("new sourceWrap="  +  Util.bytes2HexString(sourceWrap.array()));

            int totalLen = sourceWrap.array().length;
            if ( totalLen / 16 < 2){
                return new byte[0];
            }


            int com = totalLen % 16;
            int sendBuffLen = totalLen - com -16;
            byte[] sendBuff = new byte[sendBuffLen];



            sourceWrap.position(0);
            sourceWrap.get( sendBuff , 0, sendBuff.length );
            byte[] waitBuff = new byte[ totalLen - sendBuffLen ];
            sourceWrap.get( waitBuff , 0, waitBuff.length );

            System.out.println( String.format("debug inDataLen=%d totalDataLen=%d sendDataLen=%d 16=%d iPkgNum=%d",
                    pcData.length,
                    totalLen,
                    sendBuff.length,
                    sendBuff.length % 16,
                    iPkgNum)
            );

            System.out.println( "waitBuff=" + Util.bytes2HexString( waitBuff ) );

            if( 0x00 ==  waitBuff[0] ) {
                System.out.println("eee");
            }
            sourceWrap = ByteBuffer.wrap( waitBuff );
            System.out.println("sourceWrap="  +  Util.bytes2HexString(sourceWrap.array()));
            byte[] bytes2 = api.SYD_SM4_LongData(iKeyIndex, sendBuff, iPkgNum, iFlag);

            iPkgNum = 2;
            return bytes2;
        }

    }

    public byte[] finish() {
        if (is_finished) {
            throw new SydApiException(0);
        }
        this.is_finished = true;
        if (1 == this.iPkgNum) {
            this.iPkgNum = 0;
        } else if (2 == this.iPkgNum) {
            this.iPkgNum = 3;
        }

        if (iFlag == 0){
            byte[] d = sourceWrap.array();
            byte[] bytes = api.SYD_SM4_LongData(iKeyIndex,d, iPkgNum, iFlag);
            sourceWrap = null;
            return bytes;
        }
        byte[] bytes = api.SYD_SM4_LongData(iKeyIndex,sourceWrap.array(), iPkgNum, iFlag);
        sourceWrap = null;
        return bytes;
    }

    public ByteBuffer bufferResult(int plength, byte[] pcData) {
        ByteBuffer bufferResult = ByteBuffer.allocate(sourceWrap.array().length + plength);
        bufferResult.put(sourceWrap);
        bufferResult.put(pcData);
        return bufferResult;
    }
}