/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You 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.apache.camel.component.langchain4j.agent.api;

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

import dev.langchain4j.service.tool.ToolProvider;
import dev.langchain4j.service.tool.ToolProviderRequest;
import dev.langchain4j.service.tool.ToolProviderResult;

/**
 * A composite {@link ToolProvider} that aggregates tools from multiple underlying {@link ToolProvider} instances.
 *
 * <p>
 * This class enables the coexistence of different tool sources (e.g., Camel route tools and MCP tools) within a single
 * AI agent. When {@link #provideTools(ToolProviderRequest)} is called, it delegates to each underlying provider and
 * merges all returned tools into a single {@link ToolProviderResult}.
 * </p>
 *
 * @since 4.19.0
 */
public class CompositeToolProvider implements ToolProvider {

    private final List<ToolProvider> providers;

    public CompositeToolProvider(List<ToolProvider> providers) {
        this.providers = new ArrayList<>(providers);
    }

    @Override
    public ToolProviderResult provideTools(ToolProviderRequest request) {
        ToolProviderResult.Builder resultBuilder = ToolProviderResult.builder();

        for (ToolProvider provider : providers) {
            ToolProviderResult result = provider.provideTools(request);
            result.tools().forEach(resultBuilder::add);
            resultBuilder.immediateReturnToolNames(result.immediateReturnToolNames());
        }

        return resultBuilder.build();
    }
}
