import java.io.BufferedReader;
import java.io.File;
import java.io.FileReader;
import java.util.HashMap;

public class Main {

    static HashMap<String, Integer> savedVar = new HashMap<String, Integer>(); // hashmap to hold variables and values

    public static void main(String[] args) throws Exception {
        File bareBonesFile = new File("D:\\Users\\Naser Salameh\\Desktop\\BareBones.txt"); //reads file at path
        BufferedReader in = new BufferedReader(new FileReader(bareBonesFile));
        String bareBonesLine;
        StringBuilder bareBonesText = new StringBuilder();
        while ((bareBonesLine = in.readLine()) != null) {
            bareBonesText.append(bareBonesLine.trim()); // append each line to stringBuilder
        }
        String bareBonesCode= bareBonesText.toString(); // convert stringBuilder to String
        System.out.println(bareBonesCode);
       bareBonesInterpreter(bareBonesCode);
    }

    public static void bareBonesInterpreter(String bareBonesCode) { // takes full line of code and seperates them to current line and rest of lines
        int lineCount = bareBonesCode.length() - bareBonesCode.replaceAll(";", "").length(); // counts the number of lines by counting ;
        if (lineCount == 0) { // if no more lines left
            System.out.println("Ended Success");
            System.exit(0);
        }
        if (lineCount > 1){
            String[] linePart = bareBonesCode.split(";", 2); // splits code into current line and rest of code
            System.out.println(linePart[0]); // print each line to track
            if (linePart[0].indexOf("while") != -1) // at while loop initiate while method
                linePart[1] = bareBonesWhile(bareBonesCode);
            bareBonesCommand(linePart[0]); // send current line to command method
            bareBonesInterpreter(linePart[1]); // send rest of code recursively to interpreter method
        }
        else{
            System.out.println(bareBonesCode);
            bareBonesCommand(bareBonesCode);
        }
    }

    public static void bareBonesCommand(String bareBonesLine){ // takes line of code and interprets command
        String[] linePart = bareBonesLine.split(" "); // split to command and variable
        linePart[1] = linePart[1].substring(0,1); // remove ; from variable
        if (savedVar.get(linePart[1]) == null) { // if new variable, create new var in hashmap
            savedVar.put(linePart[1], 0);
            System.out.println("New variable: " + linePart[1] + " Declared at 0.");
        } else {
            switch (linePart[0]) { // switch for different commands
                case "clear":
                    savedVar.put(linePart[1], 0);
                    break;
                case "incr":
                    savedVar.put(linePart[1], savedVar.get(linePart[1]) + 1);
                    break;
                case "decr":
                    savedVar.put(linePart[1], savedVar.get(linePart[1]) - 1);
                    break;
            }
            System.out.println(linePart[1] + ", Value: " + savedVar.get(linePart[1])); // to keep track of change
        }
    }

    public static String bareBonesWhile(String loopCode) { // while method to handle while loops
        String[] loopPart = loopCode.split(";",2); // split loop to interpret while condition
        String loopVar = loopPart[0].substring(6,7); // remove ; from while variable
        boolean nestedCheck = true; // bool to predict nested loops
        int endIndex =0;
        do {
            endIndex = loopPart[1].indexOf("end;",endIndex + 1); // set string from loop start to first END keyword
            int whileCount = (loopPart[1].substring(0, endIndex).length() - loopPart[1].substring(0, endIndex).replaceAll("while", "").length()) /5; // count whiles between current length
            int endCount = (loopPart[1].substring(0, endIndex).length() - loopPart[1].substring(0, endIndex).replaceAll("end", "").length() ) /3; // count ends between current length
            if (whileCount == endCount) { // if there are whiles equal to ends then it is not nested
                nestedCheck = false;
            }
        } while (nestedCheck);
        String loop = loopPart[1].substring(0,endIndex); // set loop codes string
        while (savedVar.get(loopVar) > 0){ // loop conditon ASSUMPTION: Bare Bones only accepts while loops when var is NOT 0 -- IDEA to fix in WEEK 3 Challenge
            bareBonesInterpreter(loop);
        }
        return loopPart[1].substring(endIndex+4); // after loop send remainder of code String
    }
}