package vaporize.library;

import cs132.vapor.ast.*;
import java.util.ArrayList;

/**
 * This class contains various generic methods for
 * assembling common-use vaporm strings and managing
 * the original input program.
 *
 * Robert Martin cries
 */
class Kettle {

    ArrayList<String> vapor;

    protected Kettle(ArrayList<String> vapor) {
	this.vapor = vapor;
    }

    protected String get(Node n) {
	/**
	 * Given the source position of a Node, returns the original line.
	 */
	return this.vapor.get(this.indexOf(n));
    }

    protected void replaceFunctionDeclare(VFunction prev, int in,
					int out, int local) {
	this.set(prev,
		 String.format("func %s [in %d, out %d, local %d]",
			       this.parseFuncName(this.get(prev)),
			       in,
			       out,
			       local));
    }

    protected String spill() {
	return null;
    }

    protected String backup() {
	return null;
    }

    protected String dump() {
	return String.join("\n", this.vapor);
    }

    private int indexOf(Node n) {
	return n.sourcePos.line-1;
    }

    private void set(Node n, String s) {
	/**
	 * Sets the position of Node n in the original
	 * file to String s.
	 */
	this.vapor.set(this.indexOf(n), s);
    }

    private static String parseFuncName(String func) {
	/**
	 * "func A_foo(this t.1)"  -> "A_foo"
	 */
	int openParenIndex = func.indexOf('(');    
	return func.substring(5, openParenIndex);
    }

}