/*
 * Copyright (c) 2015, WSO2 Inc. (http://www.wso2.org) All Rights Reserved.
 *
 * WSO2 Inc. 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.wso2.carbon.policy.mgt.core.task;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.wso2.carbon.context.PrivilegedCarbonContext;
import org.wso2.carbon.ntask.common.TaskException;
import org.wso2.carbon.ntask.core.TaskInfo;
import org.wso2.carbon.ntask.core.TaskManager;
import org.wso2.carbon.ntask.core.service.TaskService;
import org.wso2.carbon.policy.mgt.common.PolicyMonitoringTaskException;
import org.wso2.carbon.policy.mgt.core.internal.PolicyManagementDataHolder;
import org.wso2.carbon.policy.mgt.core.util.PolicyManagementConstants;
import org.wso2.carbon.policy.mgt.core.util.PolicyManagerUtil;
import org.wso2.carbon.ntask.core.TaskInfo.TriggerInfo;

import java.util.HashMap;
import java.util.Map;

public class TaskScheduleServiceImpl implements TaskScheduleService {

    private static Log log = LogFactory.getLog(TaskScheduleServiceImpl.class);

    @Override
    public void startTask(int monitoringFrequency) throws PolicyMonitoringTaskException {

        if (monitoringFrequency <= 0) {
            throw new PolicyMonitoringTaskException("Time interval cannot be 0 or less than 0.");
        }
        try {
            int tenantId = PrivilegedCarbonContext.getThreadLocalCarbonContext().getTenantId();
            TaskService taskService = PolicyManagementDataHolder.getInstance().getTaskService();
            taskService.registerTaskType(PolicyManagementConstants.TASK_TYPE);

            if (log.isDebugEnabled()) {
                log.debug("Monitoring task is started for the tenant id " + tenantId);
            }

            TaskManager taskManager = taskService.getTaskManager(PolicyManagementConstants.TASK_TYPE);

            TriggerInfo triggerInfo = new TriggerInfo();

            triggerInfo.setIntervalMillis(monitoringFrequency);
            triggerInfo.setRepeatCount(-1);

            Map<String, String> properties = new HashMap<>();
            properties.put(PolicyManagementConstants.TENANT_ID, String.valueOf(tenantId));

            String taskName = PolicyManagementConstants.TASK_NAME + "_" + String.valueOf(tenantId);

            TaskInfo taskInfo = new TaskInfo(taskName, PolicyManagementConstants.TASK_CLAZZ, properties, triggerInfo);

            taskManager.registerTask(taskInfo);
            taskManager.rescheduleTask(taskInfo.getName());


        } catch (TaskException e) {
            String msg = "Error occurred while creating the task for tenant " + PrivilegedCarbonContext.
                    getThreadLocalCarbonContext().getTenantId();
            log.error(msg, e);
            throw new PolicyMonitoringTaskException(msg, e);
        }


    }

    @Override
    public void stopTask() throws PolicyMonitoringTaskException {
        try {
            int tenantId = PrivilegedCarbonContext.getThreadLocalCarbonContext().getTenantId();
            String taskName = PolicyManagementConstants.TASK_NAME + "_" + String.valueOf(tenantId);
            TaskService taskService = PolicyManagementDataHolder.getInstance().getTaskService();
            TaskManager taskManager = taskService.getTaskManager(PolicyManagementConstants.TASK_TYPE);
            taskManager.deleteTask(taskName);
        } catch (TaskException e) {
            String msg = "Error occurred while deleting the task for tenant " + PrivilegedCarbonContext.
                    getThreadLocalCarbonContext().getTenantId();
            log.error(msg, e);
            throw new PolicyMonitoringTaskException(msg, e);
        }
    }

    @Override
    public void updateTask(int monitoringFrequency) throws PolicyMonitoringTaskException {
        try {
            int tenantId = PrivilegedCarbonContext.getThreadLocalCarbonContext().getTenantId();
            String taskName = PolicyManagementConstants.TASK_NAME + "_" + String.valueOf(tenantId);
            TaskService taskService = PolicyManagementDataHolder.getInstance().getTaskService();

            TaskManager taskManager = taskService.getTaskManager(PolicyManagementConstants.TASK_TYPE);

            taskManager.deleteTask(taskName);

            TriggerInfo triggerInfo = new TriggerInfo();

            triggerInfo.setIntervalMillis(monitoringFrequency);
            triggerInfo.setRepeatCount(-1);

            Map<String, String> properties = new HashMap<>();
            properties.put("tenantId", String.valueOf(tenantId));

            TaskInfo taskInfo = new TaskInfo(taskName, PolicyManagementConstants.TASK_CLAZZ, properties, triggerInfo);

            taskManager.registerTask(taskInfo);
            taskManager.rescheduleTask(taskInfo.getName());

        } catch (TaskException e) {
            String msg = "Error occurred while updating the task for tenant " + PrivilegedCarbonContext.
                    getThreadLocalCarbonContext().getTenantId();
            log.error(msg, e);
            throw new PolicyMonitoringTaskException(msg, e);
        }

    }
}
