/*
 * Copyright (c) "Neo4j"
 * Neo4j Sweden AB [http://neo4j.com]
 *
 * This file is part of Neo4j.
 *
 * Neo4j is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
package org.neo4j.tooling.procedure.compilerutils;

import static java.util.Arrays.asList;

import java.util.Collection;
import java.util.List;
import java.util.Map;
import javax.lang.model.type.PrimitiveType;
import javax.lang.model.type.TypeKind;
import javax.lang.model.type.TypeMirror;
import javax.lang.model.util.Elements;
import javax.lang.model.util.Types;
import org.neo4j.graphdb.Node;
import org.neo4j.graphdb.Path;
import org.neo4j.graphdb.Relationship;

public class TypeMirrorUtils {

    private Types typeUtils;
    private Elements elementUtils;

    public TypeMirrorUtils(Types typeUtils, Elements elementUtils) {
        this.typeUtils = typeUtils;
        this.elementUtils = elementUtils;
    }

    public final Collection<TypeMirror> procedureAllowedTypes() {
        PrimitiveType bool = primitive(TypeKind.BOOLEAN);
        PrimitiveType longType = primitive(TypeKind.LONG);
        PrimitiveType doubleType = primitive(TypeKind.DOUBLE);
        return asList(
                bool,
                boxed(bool),
                longType,
                boxed(longType),
                doubleType,
                boxed(doubleType),
                typeMirror(String.class),
                typeMirror(Number.class),
                typeMirror(Object.class),
                typeMirror(Map.class),
                typeMirror(List.class),
                typeMirror(Node.class),
                typeMirror(Relationship.class),
                typeMirror(Path.class));
    }

    public PrimitiveType primitive(TypeKind kind) {
        return typeUtils.getPrimitiveType(kind);
    }

    public TypeMirror typeMirror(Class<?> type) {
        return elementUtils.getTypeElement(type.getName()).asType();
    }

    private TypeMirror boxed(PrimitiveType bool) {
        return typeUtils.boxedClass(bool).asType();
    }
}
