package fabrik.simulator.pic16f84;

import java.util.Arrays;

public class DataRegister {
    public static final int STATUS = 0x3;
    public static final int TRISA = 0x85;
    public static final int TRISB = 0x86;
    public static final int PCL = 0x2;
    public static final int RP0 = 0x5;

    private static final int [] dataRegister =  new int[0xFF];

    public static void initDataRegister() {
        dataRegister[PCL] = 0b0;
        dataRegister[STATUS] = 0b00011000;
        dataRegister[0xA] = 0b0;
        dataRegister[0xB] = 0b0;

        dataRegister[0x81] = 0b11111111;
        dataRegister[0x82] = dataRegister[PCL];
        dataRegister[0x83] = dataRegister[STATUS];
        dataRegister[TRISA] = 0b11111000;
        dataRegister[TRISB] = 0b11111111;
        dataRegister[0x8A] = dataRegister[0xA];
        dataRegister[0x8B] = dataRegister[0xB];
        System.out.println(Arrays.toString(dataRegister));
    }

    public static int[] getDataRegister() {
        return dataRegister;
    }

    private static int bank() {
        return ((dataRegister[STATUS] >> RP0) & 1) * 0x80;
    }

    public static int getRegister(int fileAddress){
        return dataRegister[bank() + fileAddress];
    }

    public static void setRegister(int fileAddress, int content){
        dataRegister[bank() + fileAddress] = content;
    }

    public static int getBit(int address, int bit) {
        return (dataRegister[bank() + address] >> bit) & 1;
    }

    public static void clearBit(int address, int bit) {
        dataRegister[bank() + address] -= (int) Math.pow(2, bit);
    }

    public static void setBit(int address, int bit) {
        dataRegister[bank() + address] += (int) Math.pow(2, bit);
    }

    private static int programCounter = 0;

    private static void writeToPCL(){
        dataRegister[PCL] = programCounter;
        dataRegister[0x82] = dataRegister[PCL];
    }

    public static void increasePC (){
        programCounter = getRegister(PCL);
        if (programCounter != 0x3FF) {
            programCounter++;
        }
        else {
            programCounter = 0;
        }
        writeToPCL();
    }

    public static void setPC (int value){
        programCounter = value;
        writeToPCL();
    }

    public static int getPC(){
        return programCounter;
    }

}