/*
 *   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.device.mgt.core.operation.mgt.dao.impl;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.wso2.carbon.device.mgt.core.dto.operation.mgt.Operation;
import org.wso2.carbon.device.mgt.core.dto.operation.mgt.ProfileOperation;
import org.wso2.carbon.device.mgt.core.operation.mgt.dao.OperationManagementDAOException;
import org.wso2.carbon.device.mgt.core.operation.mgt.dao.OperationManagementDAOFactory;
import org.wso2.carbon.device.mgt.core.operation.mgt.dao.OperationManagementDAOUtil;

import java.io.*;
import java.sql.*;
import java.util.ArrayList;
import java.util.List;

public class ProfileOperationDAOImpl extends GenericOperationDAOImpl {

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

    public int addOperation(Operation operation) throws OperationManagementDAOException {
        PreparedStatement stmt = null;
        ByteArrayOutputStream bao = null;
        ObjectOutputStream oos = null;

        int operationId;
        try {
            operationId = super.addOperation(operation);
            operation.setCreatedTimeStamp(new Timestamp(new java.util.Date().getTime()).toString());
            operation.setId(operationId);
            operation.setEnabled(true);
            //ProfileOperation profileOp = (ProfileOperation) operation;
            Connection conn = OperationManagementDAOFactory.getConnection();
            stmt = conn.prepareStatement("INSERT INTO DM_PROFILE_OPERATION(OPERATION_ID, OPERATION_DETAILS) " +
                    "VALUES(?, ?)");

            bao = new ByteArrayOutputStream();
            oos = new ObjectOutputStream(bao);
            oos.writeObject(operation.getPayLoad());

            stmt.setInt(1, operationId);
            stmt.setBytes(2, bao.toByteArray());
            stmt.executeUpdate();
        } catch (SQLException e) {
            throw new OperationManagementDAOException("Error occurred while adding profile operation", e);
        } catch (IOException e) {
            throw new OperationManagementDAOException("Error occurred while serializing profile operation object", e);
        } finally {
            if (bao != null) {
                try {
                    bao.close();
                } catch (IOException e) {
                    log.warn("Error occurred while closing ByteArrayOutputStream", e);
                }
            }
            if (oos != null) {
                try {
                    oos.close();
                } catch (IOException e) {
                    log.warn("Error occurred while closing ObjectOutputStream", e);
                }
            }
            OperationManagementDAOUtil.cleanupResources(stmt);
        }
        return operationId;
    }

    public Operation getOperation(int id) throws OperationManagementDAOException {
        PreparedStatement stmt = null;
        ResultSet rs = null;
        ProfileOperation profileOperation = null;

        ByteArrayInputStream bais;
        ObjectInputStream ois;
        try {
            Connection conn = OperationManagementDAOFactory.getConnection();
            String sql = "SELECT o.ID, po.ENABLED, po.OPERATION_DETAILS, o.CREATED_TIMESTAMP, o.OPERATION_CODE " +
                    "FROM DM_PROFILE_OPERATION po INNER JOIN DM_OPERATION o ON po.OPERATION_ID = o.ID WHERE po.OPERATION_ID=?";

            stmt = conn.prepareStatement(sql);
            stmt.setInt(1, id);
            rs = stmt.executeQuery();

            if (rs.next()) {
                byte[] operationDetails = rs.getBytes("OPERATION_DETAILS");
                int oppId = rs.getInt("ID");
                bais = new ByteArrayInputStream(operationDetails);
                ois = new ObjectInputStream(bais);
                Object obj = ois.readObject();
                if(obj instanceof String){
                    profileOperation = new ProfileOperation();
                    profileOperation.setCode(rs.getString("OPERATION_CODE"));
                    profileOperation.setId(oppId);
                    profileOperation.setCreatedTimeStamp(rs.getString("CREATED_TIMESTAMP"));
                    profileOperation.setId(oppId);
                    profileOperation.setPayLoad(obj);
                } else {
                    profileOperation = (ProfileOperation) obj;
                }
            }
        } catch (IOException e) {
            throw new OperationManagementDAOException("IO Error occurred while de serialize the profile " +
                    "operation object", e);
        } catch (ClassNotFoundException e) {
            throw new OperationManagementDAOException("Class not found error occurred while de serialize the " +
                    "profile operation object", e);
        } catch (SQLException e) {
            throw new OperationManagementDAOException("SQL Error occurred while retrieving the profile " +
                    "operation object " + "available for the id '" + id, e);
        } finally {
            OperationManagementDAOUtil.cleanupResources(stmt, rs);
        }
        return profileOperation;
    }

    @Override
    public List<? extends Operation> getOperationsByDeviceAndStatus(int enrolmentId,
                                                                    Operation.Status status) throws OperationManagementDAOException {
        PreparedStatement stmt = null;
        ResultSet rs = null;
        ProfileOperation profileOperation;

        List<Operation> operationList = new ArrayList<Operation>();

        ByteArrayInputStream bais = null;
        ObjectInputStream ois = null;

        try {
            Connection conn = OperationManagementDAOFactory.getConnection();
            String sql = "SELECT o.ID, po1.ENABLED, po1.STATUS, o.TYPE, o.CREATED_TIMESTAMP, o.RECEIVED_TIMESTAMP, " +
                    "o.OPERATION_CODE, po1.OPERATION_DETAILS " +
                    "FROM (SELECT po.OPERATION_ID, po.ENABLED, po.OPERATION_DETAILS, dm.STATUS " +
                    "FROM DM_PROFILE_OPERATION po INNER JOIN (SELECT ENROLMENT_ID, OPERATION_ID, STATUS FROM DM_ENROLMENT_OP_MAPPING " +
                    "WHERE ENROLMENT_ID = ? AND STATUS = ?) dm ON dm.OPERATION_ID = po.OPERATION_ID) po1 " +
                    "INNER JOIN DM_OPERATION o ON po1.OPERATION_ID = o.ID ";

            stmt = conn.prepareStatement(sql);
            stmt.setInt(1, enrolmentId);
            stmt.setString(2, status.toString());

            rs = stmt.executeQuery();

            while (rs.next()) {
                byte[] operationDetails = rs.getBytes("OPERATION_DETAILS");
                bais = new ByteArrayInputStream(operationDetails);
                ois = new ObjectInputStream(bais);
                Object obj = ois.readObject();
                if(obj instanceof String){
                    profileOperation = new ProfileOperation();
                    profileOperation.setCode(rs.getString("OPERATION_CODE"));
                    profileOperation.setId(rs.getInt("ID"));
                    profileOperation.setCreatedTimeStamp(rs.getString("CREATED_TIMESTAMP"));
                    profileOperation.setPayLoad(obj);
                    profileOperation.setStatus(status);
                    operationList.add(profileOperation);
                } else {
                    profileOperation = (ProfileOperation) obj;
                    profileOperation.setStatus(status);
                    operationList.add(profileOperation);
                }
            }

        } catch (IOException e) {
            throw new OperationManagementDAOException("IO Error occurred while de serialize the profile " +
                    "operation object", e);
        } catch (ClassNotFoundException e) {
            throw new OperationManagementDAOException("Class not found error occurred while de serialize the " +
                    "profile operation object", e);
        } catch (SQLException e) {
            throw new OperationManagementDAOException("SQL error occurred while retrieving the operation " +
                    "available for the device'" + enrolmentId + "' with status '" + status.toString(), e);
        } finally {
            if (bais != null) {
                try {
                    bais.close();
                } catch (IOException e) {
                    log.warn("Error occurred while closing ByteArrayOutputStream", e);
                }
            }
            if (ois != null) {
                try {
                    ois.close();
                } catch (IOException e) {
                    log.warn("Error occurred while closing ObjectOutputStream", e);
                }
            }
            OperationManagementDAOUtil.cleanupResources(stmt, rs);
        }
        return operationList;
    }

}
