/*
 * Copyright 2020 Red Hat, Inc. and/or its affiliates.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *       http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.dashbuilder.external.impl;

import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

import javax.annotation.PostConstruct;
import javax.enterprise.context.ApplicationScoped;
import javax.enterprise.inject.Instance;
import javax.inject.Inject;

import org.dashbuilder.external.service.BackendComponentFunctionService;
import org.jboss.errai.bus.server.annotations.Service;

@Service
@ApplicationScoped
public class BackendComponentFunctionServiceImpl implements BackendComponentFunctionService {

    Map<String, BackendComponentFunction<?>> functions;
    
    @Inject
    Instance<BackendComponentFunction<?>> functionsInstances;

    @PostConstruct
    void loadFunctions() {
        functions = new HashMap<>();
        functionsInstances.forEach(instance -> functions.put(instance.getName(), instance));
    }

    @Override
    public List<String> listFunctions() {
        return new ArrayList<>(functions.keySet());
    }

    @Override
    public Object callFunction(String name, Map<String, Object> params) {
        BackendComponentFunction<?> function = functions.get(name);
        return function.exec(params);
    }

}