/*
 * Copyright 2014 by SCSK Corporation.
 * 
 * This file is part of PrimeCloud Controller(TM).
 * 
 * PrimeCloud Controller(TM) 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 2 of the License, or
 * (at your option) any later version.
 * 
 * PrimeCloud Controller(TM) 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 PrimeCloud Controller(TM). If not, see <http://www.gnu.org/licenses/>.
 */
package jp.primecloud.auto.api.lb;


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

import javax.ws.rs.GET;
import javax.ws.rs.Path;
import javax.ws.rs.Produces;
import javax.ws.rs.QueryParam;
import javax.ws.rs.core.MediaType;

import jp.primecloud.auto.api.ApiSupport;
import jp.primecloud.auto.api.ApiValidate;

import org.apache.commons.lang.BooleanUtils;

import jp.primecloud.auto.api.response.lb.AttachLoadBalancerResponse;
import jp.primecloud.auto.common.status.InstanceStatus;
import jp.primecloud.auto.entity.crud.ComponentInstance;
import jp.primecloud.auto.entity.crud.Instance;
import jp.primecloud.auto.entity.crud.LoadBalancer;
import jp.primecloud.auto.exception.AutoApplicationException;


@Path("/AttachLoadBalancer")
public class AttachLoadBalancer extends ApiSupport {

    /**
     *
     * ロードバランサ サーバ割り当て有効化
     * @param loadBalancerNo ロードバランサ番号
     * @param instanceNo インスタンス番号
     *
     * @return AttachLoadBalancerResponse
     */
    @GET
    @Produces(MediaType.APPLICATION_JSON)
	public AttachLoadBalancerResponse attachLoadBalancer(
	        @QueryParam(PARAM_NAME_LOAD_BALANCER_NO) String loadBalancerNo,
	        @QueryParam(PARAM_NAME_INSTANCE_NO) String instanceNo){

        AttachLoadBalancerResponse response = new AttachLoadBalancerResponse();

            // 入力チェック
            // LoadBalancerNo
            ApiValidate.validateLoadBalancerNo(loadBalancerNo);
            // InstanceNo
            ApiValidate.validateInstanceNo(instanceNo);

            // ロードバランサ取得
            LoadBalancer loadBalancer = getLoadBalancer(Long.parseLong(loadBalancerNo));

            // 権限チェック
            checkAndGetUser(loadBalancer);

            // インスタンス取得
            Instance instance = getInstance(Long.parseLong(instanceNo));

            if (BooleanUtils.isFalse(instance.getFarmNo().equals(loadBalancer.getFarmNo()))) {
                //ファームとインスタンスが一致しない
                throw new AutoApplicationException("EAPI-100022", "Instance", loadBalancer.getFarmNo(), PARAM_NAME_INSTANCE_NO, instanceNo);
            }

            // サーバのステータスチェック
            InstanceStatus instanceStatus = InstanceStatus.fromStatus(instance.getStatus());
            if (instanceStatus == InstanceStatus.CONFIGURING || instanceStatus == InstanceStatus.WARNING) {
                // ステータスが Configuring 及び Warning の場合は割り当て不可
                throw new AutoApplicationException("EAPI-100001", loadBalancerNo, instanceNo);
            }

            // コンポーネントのチェック
            List<ComponentInstance> componentInstances = componentInstanceDao.readByComponentNo(loadBalancer.getComponentNo());
            boolean isContain = false;
            for (ComponentInstance componentInstance : componentInstances) {
                if (BooleanUtils.isFalse(componentInstance.getAssociate())) {
                    continue;
                }
                if (componentInstance.getInstanceNo().equals(instance.getInstanceNo())) {
                    isContain = true;
                    break;
                }
            }
            if (BooleanUtils.isFalse(isContain)) {
                // インスタンスがコンポーネントに含まれていない場合
                throw new AutoApplicationException("EAPI-100012", Long.parseLong(loadBalancerNo),
                        loadBalancer.getComponentNo(), Long.parseLong(instanceNo));
            }

            // ロードバランサ サーバ割り当て有効化設定処理
            List<Long> instanceNos = new ArrayList<Long>();
            instanceNos.add(Long.parseLong(instanceNo));
            loadBalancerService.enableInstances(Long.parseLong(loadBalancerNo), instanceNos);

            response.setSuccess(true);

        return  response;
    }
}