import std.stdio;
import std.string;
import std.conv;

import parser;

enum ObjType {
    FUNCTION,
}

abstract class Obj {
    ObjType type;
}

class Function : Obj {
    Chunk chunk;
    string name;

    this() {
        this.type = ObjType.FUNCTION;
        this.chunk = new Chunk();
        this.name = "";
    }

    override string toString() {
        if (name == "") {
            return "<neb>";
        } else {
            return name;
        }
    }
}

enum OpCode {
    OP_ADD,
    OP_LESS,
    OP_NEGATE,
    OP_RETURN,
    OP_CONSTANT,
    OP_DEFINE_GLOBAL,
    OP_GET_GLOBAL,
    OP_POP,
    OP_SUBTRACT,
    OP_NIL,
}

class Chunk {
    int count = 0;
    ubyte[] code;
    int[] lines;
    Value[] constants;

    //int writeOp(OpCode opCode, int line) {
    int writeOp(ubyte opCode, int line) {
        this.code ~= opCode;
        this.lines ~= line;
        this.count++;
        assert(this.code.length == count);
        assert(this.lines.length == count);
        return count;
    }

    int addConstant(Value value) {
        this.constants ~= value;
        return to!int(this.constants.length - 1);
    }

}