package org.jumpmind.db.platform.postgresql;

/*
 * 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.
 */

import java.sql.Array;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Types;
import java.util.Map;

import javax.sql.DataSource;
import javax.sql.rowset.serial.SerialBlob;

import org.apache.commons.lang.StringUtils;
import org.jumpmind.db.model.Column;
import org.jumpmind.db.platform.AbstractJdbcDatabasePlatform;
import org.jumpmind.db.platform.DatabaseNamesConstants;
import org.jumpmind.db.sql.SqlTemplateSettings;
import org.jumpmind.db.sql.SymmetricLobHandler;
import org.jumpmind.db.util.BinaryEncoding;

/*
 * The platform implementation for PostgresSql.
 */
public class PostgreSqlDatabasePlatform extends AbstractJdbcDatabasePlatform {

    /* The standard PostgreSQL jdbc driver. */
    public static final String JDBC_DRIVER = "org.postgresql.Driver";
    
    /* The subprotocol used by the standard PostgreSQL driver. */
    public static final String JDBC_SUBPROTOCOL = "postgresql";       

    /*
     * Creates a new platform instance.
     */
    public PostgreSqlDatabasePlatform(DataSource dataSource, SqlTemplateSettings settings) {
        super(dataSource, overrideSettings(settings));
    }   
    
    protected static SqlTemplateSettings overrideSettings(SqlTemplateSettings settings) {
        if (settings == null) {
            settings = new SqlTemplateSettings();
        }
        // Query timeout needs to be zero for postrgres because the jdbc driver does
        // not support a timeout setting of of other than zero.
        settings.setQueryTimeout(0);
        return settings;
    }

    protected static boolean isBlobStoredByReference(String jdbcTypeName) {
        if ("OID".equalsIgnoreCase(jdbcTypeName) || "LO".equalsIgnoreCase(jdbcTypeName)) {
            return true;
        } else {
            return false;
        }
    }
    
    @Override
    protected PostgreSqlDdlBuilder createDdlBuilder() {
        return new PostgreSqlDdlBuilder();
    }

    @Override
    protected PostgreSqlDdlReader createDdlReader() {
        return new PostgreSqlDdlReader(this);
    }    
    
    @Override
    protected PostgreSqlJdbcSqlTemplate createSqlTemplate() {
        SymmetricLobHandler lobHandler = new PostgresLobHandler();
        return new PostgreSqlJdbcSqlTemplate(dataSource, settings, lobHandler, getDatabaseInfo());
    }

    public String getName() {
        return DatabaseNamesConstants.POSTGRESQL;
    }
    
    public String getDefaultSchema() {
        if (StringUtils.isBlank(defaultSchema)) {
            defaultSchema = (String) getSqlTemplate().queryForObject("select current_schema()", String.class);
        }
        return defaultSchema;
    }
    
    public String getDefaultCatalog() {
        return null;
    }
    

    @Override
    protected Array createArray(Column column, final String value) {
        if (StringUtils.isNotBlank(value)) {

            String jdbcTypeName = column.getJdbcTypeName();
            if (jdbcTypeName.startsWith("_")) {
                jdbcTypeName = jdbcTypeName.substring(1);
            }
            int jdbcBaseType = Types.VARCHAR;
            if (jdbcTypeName.toLowerCase().contains("int")) {
                jdbcBaseType = Types.INTEGER;
            }
                        
            final String baseTypeName = jdbcTypeName;
            final int baseType = jdbcBaseType;
            return new Array() {
                public String getBaseTypeName() {
                    return baseTypeName;
                }

                public void free() throws SQLException {
                }

                public int getBaseType() {
                    return baseType;
                }

                public Object getArray() {
                    return null;
                }

                public Object getArray(Map<String, Class<?>> map) {
                    return null;
                }

                public Object getArray(long index, int count) {
                    return null;
                }

                public Object getArray(long index, int count, Map<String, Class<?>> map) {
                    return null;
                }

                public ResultSet getResultSet() {
                    return null;
                }

                public ResultSet getResultSet(Map<String, Class<?>> map) {
                    return null;
                }

                public ResultSet getResultSet(long index, int count) {
                    return null;
                }

                public ResultSet getResultSet(long index, int count, Map<String, Class<?>> map) {
                    return null;
                }

                public String toString() {
                    return value;
                }
            };
        } else {
            return null;
        }
    }
    
    @Override
    protected String cleanTextForTextBasedColumns(String text) {
        return text.replace("\0", "");
    }
    
    
    @Override
    public Object[] getObjectValues(BinaryEncoding encoding, String[] values,
            Column[] orderedMetaData, boolean useVariableDates, boolean fitToColumn) {
        Object[] objectValues = super.getObjectValues(encoding, values, orderedMetaData, useVariableDates, fitToColumn);
        for (int i = 0; i < orderedMetaData.length; i++) {
            if (orderedMetaData[i] != null && orderedMetaData[i].getMappedTypeCode() == Types.BLOB
                    && objectValues[i] != null) {
                try {
                    objectValues[i] = new SerialBlob((byte[]) objectValues[i]);
                } catch (Exception e) {
                    throw new RuntimeException(e);
                }                
            }
        }
        return objectValues;
    }
    
}