/*
   Copyright (c) 2010, 2012, Oracle and/or its affiliates. All rights reserved.

   This program is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public License, version 2.0,
   as published by the Free Software Foundation.

   This program is also distributed with certain software (including
   but not limited to OpenSSL) that is licensed under separate terms,
   as designated in a particular file or component or in included license
   documentation.  The authors of MySQL hereby grant you an additional
   permission to link the program and your derivative works with the
   separately licensed software that they have included with MySQL.

   This program 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, version 2.0, for more details.

   You should have received a copy of the GNU General Public License
   along with this program; if not, write to the Free Software
   Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301  USA
*/

package com.mysql.clusterj.core.query;

import com.mysql.clusterj.ClusterJFatalInternalException;
import com.mysql.clusterj.ClusterJUserException;
import com.mysql.clusterj.core.spi.QueryExecutionContext;
import com.mysql.clusterj.core.spi.SessionSPI;
import com.mysql.clusterj.core.store.ResultData;
import com.mysql.clusterj.core.store.ScanFilter;
import com.mysql.clusterj.core.util.I18NHelper;
import com.mysql.clusterj.core.util.Logger;
import com.mysql.clusterj.core.util.LoggerFactoryService;
import com.mysql.clusterj.query.QueryDomainType;

import java.math.BigDecimal;
import java.math.BigInteger;
import java.sql.Date;
import java.sql.Time;
import java.sql.Timestamp;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

/** This is the execution context for a query. It contains the
 * parameter bindings so as to make query execution thread-safe.
 *
 */
public class QueryExecutionContextImpl implements QueryExecutionContext {

    /** My message translator */
    static final I18NHelper local = I18NHelper.getInstance(BetweenPredicateImpl.class);

    /** My logger */
    static final Logger logger = LoggerFactoryService.getFactory().getInstance(BetweenPredicateImpl.class);

    protected Map<String, Object> boundParameters = 
            new HashMap<String, Object>();

    /** The session for this query */
    protected SessionSPI session;

    /** The filters used in the query */
    private List<ScanFilter> filters = new ArrayList<ScanFilter>();

    /** The explain for this query; will be null until executed or explained */
    protected Map<String, Object> explain = null;

    /** Create a new execution context with an empty map of parameters.
     * @param session the session for this context
     */
    public QueryExecutionContextImpl(SessionSPI session) {
        if (session == null) {
            throw new ClusterJFatalInternalException(
                    local.message("ERR_Session_Must_Not_Be_Null"));
        }
        this.session = session;
    }

    /** Create a new execution context copying the bound parameter values.
     * This allows a new execution of a query only modifying some parameters.
     * @param context an existing execution context
     */
    protected QueryExecutionContextImpl(QueryExecutionContextImpl context) {
        this.session = context.getSession();
        this.explain = context.getExplain();
        boundParameters = new HashMap<String, Object>(context.boundParameters);
    }

    /** Create a new execution context with specific map of parameters.
     * @param session the session for this context
     * @param parameterMap the parameter map for this context
     */
    public QueryExecutionContextImpl(SessionSPI session, Map<String, Object> parameterMap) {
        this.session = session;
        this.boundParameters = parameterMap;
    }

    /** Bind the value of a parameter for this query execution.
     *
     * @param parameterName the name of the parameter
     * @param value the value for the parameter
     */
    public void bindParameterValue(String parameterName, Object value) {
        if (parameterName == null) {
            throw new ClusterJUserException(
                    local.message("ERR_Parameter_Null"));
        }
        boundParameters.put(parameterName, value);
        // if any parameters changed, the explain is no longer valid
        this.explain = null;
    }
    /** Get the value of a parameter by name.
     */
    public Object getParameterValue(String parameterName) {
        if (!isBound(parameterName)) {
            throw new ClusterJUserException(
                    local.message("ERR_Parameter_Not_Bound", parameterName));
        }
        return boundParameters.get(parameterName);
    }

    /** Return whether the parameter has a value for this execution context.
     *
     * @param parameterName the name of the parameter
     * @return whether the parameter has a value
     */
    public boolean isBound(String parameterName) {
        return boundParameters.containsKey(parameterName);
    }

    public SessionSPI getSession() {
        return session;
    }

    public ResultData getResultData(QueryDomainType<?> queryDomainType) {
        // TODO handle skip and limit
        return ((QueryDomainTypeImpl<?>)queryDomainType).getResultData(this, 0, Long.MAX_VALUE, null, null);
    }

    /** Add a filter to the list of filters created for this query.
     * @param scanFilter the filter
     */
    public void addFilter(ScanFilter scanFilter) {
        filters.add(scanFilter);
    }

    /** Delete all the filters created for this query.
     */
    public void deleteFilters() {
        for (ScanFilter filter: filters) {
            filter.delete();
        }
        filters.clear();
    }

    public void setExplain(Map<String, Object> explain) {
        this.explain = explain;
    }

    public Map<String, Object> getExplain() {
        return explain;
    }

    public Byte getByte(String index) {
        Object result = boundParameters.get(index);
        if (result == null) {
            return null;
        }
        if (result instanceof Byte) {
            return (Byte)result;
        } else {
            throw new ClusterJUserException(local.message("ERR_Parameter_Wrong_Type", index, result.getClass(), "Byte"));
        }
    }

    public BigDecimal getBigDecimal(String index) {
        Object result = boundParameters.get(index);
        if (result == null) {
            return null;
        }
        if (result instanceof BigDecimal) {
            return (BigDecimal)result;
        } else {
            throw new ClusterJUserException(local.message("ERR_Parameter_Wrong_Type", index, result.getClass(), "BigDecimal"));
        }
    }

    public BigInteger getBigInteger(String index) {
        Object result = boundParameters.get(index);
        if (result == null) {
            return null;
        }
        if (result instanceof BigInteger) {
            return (BigInteger)result;
        } else {
            throw new ClusterJUserException(local.message("ERR_Parameter_Wrong_Type", index, result.getClass(), "BigInteger"));
        }
    }

    public Boolean getBoolean(String index) {
        Object result = boundParameters.get(index);
        if (result == null) {
            return null;
        }
        if (result instanceof Boolean) {
            return (Boolean)result;
        } else {
            throw new ClusterJUserException(local.message("ERR_Parameter_Wrong_Type", index, result.getClass(), "Boolean"));
        }
    }

    public byte[] getBytes(String index) {
        Object result = boundParameters.get(index);
        if (result == null) {
            return null;
        }
        if (result instanceof byte[]) {
            return (byte[])result;
        } else {
            throw new ClusterJUserException(local.message("ERR_Parameter_Wrong_Type", index, result.getClass(), "byte[]"));
        }
    }

    public Double getDouble(String index) {
        Object result = boundParameters.get(index);
        if (result == null) {
            return null;
        }
        if (result instanceof Double) {
            return (Double)result;
        } else {
            throw new ClusterJUserException(local.message("ERR_Parameter_Wrong_Type", index, result.getClass(), "Double"));
        }
    }

    public Float getFloat(String index) {
        Object result = boundParameters.get(index);
        if (result == null) {
            return null;
        }
        if (result instanceof Float) {
            return (Float)result;
        } else {
            throw new ClusterJUserException(local.message("ERR_Parameter_Wrong_Type", index, result.getClass(), "Float"));
        }
    }

    public Integer getInt(String index) {
        Object result = boundParameters.get(index);
        if (result == null) {
            return null;
        }
        if (result instanceof Integer) {
            return (Integer)result;
        } else {
            throw new ClusterJUserException(local.message("ERR_Parameter_Wrong_Type", index, result.getClass(), "Integer"));
        }
    }

    public Date getJavaSqlDate(String index) {
        Object result = boundParameters.get(index);
        if (result == null) {
            return null;
        }
        if (result instanceof java.sql.Date) {
            return (java.sql.Date)result;
        } else {
            throw new ClusterJUserException(local.message("ERR_Parameter_Wrong_Type", index, result.getClass(), "java.sql.Date"));
        }
    }

    public Time getJavaSqlTime(String index) {
        Object result = boundParameters.get(index);
        if (result == null) {
            return null;
        }
        if (result instanceof java.sql.Time) {
            return (java.sql.Time)result;
        } else {
            throw new ClusterJUserException(local.message("ERR_Parameter_Wrong_Type", index, result.getClass(), "java.sql.Time"));
        }
    }

    public Timestamp getJavaSqlTimestamp(String index) {
        Object result = boundParameters.get(index);
        if (result == null) {
            return null;
        }
        if (result instanceof java.sql.Timestamp) {
            return (java.sql.Timestamp)result;
        } else {
            throw new ClusterJUserException(local.message("ERR_Parameter_Wrong_Type", index, result.getClass(), "java.sql.Timestamp"));
        }
    }

    public java.util.Date getJavaUtilDate(String index) {
        Object result = boundParameters.get(index);
        if (result == null) {
            return null;
        }
        if (result instanceof java.util.Date) {
            return (java.util.Date)result;
        } else {
            throw new ClusterJUserException(local.message("ERR_Parameter_Wrong_Type", index, result.getClass(), "java.util.Date"));
        }
    }

    public Long getLong(String index) {
        Object result = boundParameters.get(index);
        if (result == null) {
            return null;
        }
        if (result instanceof Long) {
            return (Long)result;
        } else {
            throw new ClusterJUserException(local.message("ERR_Parameter_Wrong_Type", index, result.getClass(), "Long"));
        }
    }

    public Short getShort(String index) {
        Object result = boundParameters.get(index);
        if (result == null) {
            return null;
        }
        if (result instanceof Short) {
            return (Short)result;
        } else {
            throw new ClusterJUserException(local.message("ERR_Parameter_Wrong_Type", index, result.getClass(), "Short"));
        }
    }

    public String getString(String index) {
        Object result = boundParameters.get(index);
        if (result == null) {
            return null;
        }
        if (result instanceof String) {
            return (String)result;
        } else {
            throw new ClusterJUserException(local.message("ERR_Parameter_Wrong_Type", index, result.getClass(), "String"));
        }
    }

    public Object getObject(String index) {
        return boundParameters.get(index);
    }

    public boolean hasNoNullParameters() {
        for (Object value: boundParameters.values()) {
            if (value == null) {
                return false;
            }
        }
        return true;
    }

}
