package com.tado.utils.BusSniffer;

public class crcBruteTest {
	
	public static final int[] istRoomTemp = {0x00, 0x00};
	//static final int[] newTemp = {0x00, 0xe4};
	public static final int oldTempDay = 0x00;
	public static final int oldTempN = 0x00;
	//static final int newTempDay = 0x28;
	//static final int newTempN = 0x22;	
	public static int oldCRC = 0xfa;
	public static int oldMode = 0x00;
	
	/*public static void main(String[] args) {
		
		oldCRC = changeRoomTemp(istRoomTemp, newTemp, (byte) oldCRC);
		oldCRC = changeSetTemp(oldTempDay, oldTempN, newTempDay, newTempN, (byte) oldCRC);
		oldCRC = changeMode((byte)0x00,(byte) 0x06, (byte) oldCRC);
		
		
		System.out.print(String.format("0x%02X ", oldCRC));
		
	}*/
	
	
	public static int changeSetTemp(int oldTempDay, int oldTempN, int newTempDay, int newTempN, byte oldCRC){
		
		int crc;
		int oldCRCNormal = oldCRC & 0xff;
		int tempDiffDay = (oldTempDay^newTempDay) & 0xff;
		int tempDiffN = (oldTempN^newTempN) & 0xff;
		
		// first calc new CRC for Day temperature
		if((tempDiffDay & 0x03) != 0x03){
			if((tempDiffDay & 0x01) == 0x01)
				oldCRCNormal ^= 0x40;
			if((tempDiffDay & 0x02) == 0x02)
				oldCRCNormal ^= 0x40;
		}
		if((tempDiffDay & 0x04) == 0x04)
			oldCRCNormal ^= 0x80;
		
		for (int i = 0; i < 5; i++) {
			if(((tempDiffDay >> (3 + i)) & 0x01) == 0x01)
				oldCRCNormal ^= (0x19 << i);
		}
		
		// then calculate the new crc for the night temperature
		if((tempDiffN & 0x01) == 0x01)
			oldCRCNormal ^= 0x20;
		if((tempDiffN & 0x02) == 0x02)
			oldCRCNormal ^= 0x80;
		
		for (int i = 0; i < 6; i++) {
			if(((tempDiffN >> (2 + i)) & 0x01) == 0x01)
				oldCRCNormal ^= (0x19 << i);
		}
		
		// quick fix for the problem, when the difference between the day and night 
		// temperatures is less than 10 and it is of kind x.5 
		//if(newTempN <= 0x14 )
			if(((newTempDay ^ newTempN) & 0x01) == 0x01)
				oldCRCNormal ^= 0x60;
		
		crc = oldCRCNormal;
		
		return crc & 0xff;
	}
	
	public static int changeRoomTemp(int[] oldTemp, int[] newTemp, byte oldCRC){
		int crc;
		int oldCrcNormal = oldCRC & 0xff;
		int[] tempDiff = new int[oldTemp.length];
		tempDiff[0] = ((oldTemp[0]^newTemp[0]) & 0xff);
		tempDiff[1] = ((oldTemp[1]^newTemp[1]) & 0xff);
		
		// first we make MSB
		oldCrcNormal ^= (tempDiff[0] << 2);
		
		// now LSB from IST_TEMP
		oldCrcNormal ^= (tempDiff[1] << 3);
		for (int i = 0; i < 3; i++) {
			if(((tempDiff[1] >> (5 + i)) & 0x01) == 0x01)
				oldCrcNormal ^= (0x19 << i);
		}
		
		crc = oldCrcNormal;
		
		return crc & 0xff;
	}
	
	public static int changeMode(byte oldMode, byte newMode, byte oldCRC){
		
		int crc;
		int modeDiff;
		int oldCrcNormal = oldCRC & 0xff;
		
		modeDiff = (oldMode ^ newMode) & 0xff;
		
		if((modeDiff & 0x01) == 0x01){
			oldCrcNormal ^= 0x80;
		}
		for (int i = 0; i < 7; i++) {
			if(((modeDiff >> (i+1)) & 0x01) == 0x01)
				oldCrcNormal ^= (0x19 << i);
		}
		crc = oldCrcNormal;
		
		
		return crc & 0xff;
	}
}