package io.gitlab.jfronny.muscript.ast.dynamic;

import io.gitlab.jfronny.muscript.compiler.*;
import io.gitlab.jfronny.muscript.data.Scope;
import io.gitlab.jfronny.muscript.data.dynamic.Dynamic;
import io.gitlab.jfronny.muscript.ast.DynamicExpr;
import io.gitlab.jfronny.muscript.annotations.CanThrow;
import io.gitlab.jfronny.muscript.annotations.UncheckedDynamic;
import io.gitlab.jfronny.muscript.error.LocationalException;

import java.io.IOException;

@CanThrow
@UncheckedDynamic
public class Variable extends DynamicExpr {
    public final String name;

    public Variable(int chStart, int chEnd, String name) {
        super(Order.Primary, chStart, chEnd);
        this.name = name;
    }

    @Override
    public Dynamic<?> get(Scope dataRoot) {
        if (name.equals("this")) return dataRoot;
        if (dataRoot.has(name)) return dataRoot.get(name);
        else throw new LocationalException(chStart, chEnd, "This object doesn't contain '" + name + "'");
    }

    @Override
    public DynamicExpr optimize() {
        return this;
    }

    @Override
    public void decompile(ExprWriter writer) throws IOException {
        if (!Lexer.isValidId(name)) throw new IllegalArgumentException("Not a valid variable name: " + name);
        writer.append(name);
    }

    @Override
    public boolean equals(Object obj) {
        return obj instanceof Variable variable && name.equals(variable.name);
    }
}