package io.trygvis.container.compiler.model;

import java.util.ArrayList;
import java.util.List;
import java.util.ListIterator;

public class Parameters implements Iterable<Parameters.ParameterRef> {
    public static final Parameters noParameters = new Parameters();

    private final List<ParameterRef> parameters = new ArrayList<>();

    public Parameters() {
    }

    public Parameters(TypeRef type, String name) {
        addParameter(type, name);
    }

    public Parameters(TypeRef typeA, String nameA, TypeRef typeB, String nameB) {
        addParameter(typeA, nameA);
        addParameter(typeB, nameB);
    }

    public Parameters(TypeRef typeA, String nameA, TypeRef typeB, String nameB, TypeRef typeC, String nameC) {
        addParameter(typeA, nameA);
        addParameter(typeB, nameB);
        addParameter(typeC, nameC);
    }

    public ParameterRef addParameter(TypeRef klass, String name) {
        while (taken(name)) {
            name = name + "_";
        }

        ParameterRef ref = new ParameterRef(klass, name);
        parameters.add(ref);
        return ref;
    }

    private boolean taken(String name) {
        for (ParameterRef parameter : parameters) {
            if (parameter.name.equals(name)) {
                return true;
            }
        }

        return false;
    }

    @Override
    public ListIterator<ParameterRef> iterator() {
        return parameters.listIterator();
    }

    public static class ParameterRef {
        public final TypeRef klass;
        public final String name;

        ParameterRef(TypeRef klass, String name) {
            this.klass = klass;
            this.name = name;
        }
    }
}