package assembler;

import java.io.BufferedReader;
import java.io.FileReader;
import java.io.IOException;

public class ObjectCode {
    private int cursor;
    private static final String FILENAME = "C:\\Users\\karem\\Downloads\\SIC-Example.txt";

    private void readfile() {
        BufferedReader br = null;
        FileReader fr = null;
        try {
            fr = new FileReader(FILENAME);
            br = new BufferedReader(fr);
            String CurrentLine;
            while ((CurrentLine = br.readLine()) != null) {
                // call for a function that uses the line
                this.line(CurrentLine);
            }

        } catch (IOException e) {
            e.printStackTrace();
        } finally {
            try {
                if (br != null)
                    br.close();
                if (fr != null)
                    fr.close();
            } catch (IOException ex) {
                ex.printStackTrace();
            }
        }
    }

    private void line(String line) {
        // check if comment
        char firstChar = line.charAt(0);
        if (firstChar == '.') {
            System.out.println("hello from the other side");
        } else {
            // checking format
            this.checkFormat(line);
            // get Label From Line
            if (firstChar != ' ' && line.indexOf("\t") != 0) {
                String label = getLabel(line);
                System.out.print(label);
            }
            // get OperationCode From Line
            String operationCode = getOperationCode(line);
            System.out.print("\t" + operationCode);
            // get Operand From Line
            // if no operand in the line get operand will return null
            String operand = getOperand(line);
            if (operand != null)
                System.out.print("\t" + operand);
        }
        System.out.println();
    }

    private void checkFormat(String line) {
        cursor = 8;
        int y = 0;
        if (line.charAt(0) == '\t' || line.charAt(4) == '\t') {
            cursor = 5;
            y = y + 4;
            if (line.charAt(1) == '\t') {
                cursor = 2;
                y = y + 4;
            }
        } else if (line.charAt(5) == '\t') {
            cursor = 6;
            y = y + 3;
        }
        if (line.length() > cursor && line.charAt(cursor) != ' ') {
            System.out.println("Error");
        }
        for (int i = 9; line.length() > i && i < 15; i++) {
            if (line.charAt(i) == '\t') {
                y = y + 3;
                break;
            }
        }

        if (line.length() > 15 - y && line.charAt(15 - y) != ' ' && line.charAt(15 - y) != '\t') {
            System.out.println("Error");
        }
        if (line.length() > 16 - y && line.charAt(16 - y) != ' ' && line.charAt(15 - y) != '\t') {
            System.out.println("Error");
        }

    }

    private String getLabel(String line) {
        int i = 0;
        while (i < 8) {
            if (line.length() > i && line.charAt(i) != ' ' && line.charAt(i) != '\t') {
            } else {
                break;
            }
            i++;
        }
        String label = line.substring(0, i);
        return label;
    }

    private String getOperationCode(String line) {
        int i = cursor + 1;
        int end = cursor + 7;
        while (i < end) {
            if (line.length() > i && line.charAt(i) != ' ' && line.charAt(i) != '\t') {
            } else {
                break;
            }
            i++;
        }
        String opertionCode = line.substring(cursor + 1, i);
        cursor = i;
        return opertionCode;
    }

    private String getOperand(String line) {
        boolean flag = false;
        int i = cursor + 1;
        int end = cursor + 31;
        while (i < end) {
            if (line.length() > i && line.charAt(i) == ' ' && line.charAt(i) != '\t') {
            } else {
                break;
            }
            i++;
            cursor++;
        }
        while (i < end) {
            if (line.length() > i && line.charAt(i) != ' ' && line.charAt(i) != '\t') {
                flag = true;
            } else {
                break;
            }
            i++;
        }
        if (flag) {
            String operand = line.substring(cursor + 1, i);
            return operand;
        } else
            return null;
    }

    public static void main(String[] args) {
        ObjectCode g = new ObjectCode();
        g.readfile();
    }

}