/*
 *  Copyright 2005 The Apache Software Foundation
 *
 *  Licensed 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.apache.ibatis.ibator.internal.types;

import java.math.BigDecimal;
import java.sql.Types;
import java.util.Date;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.Properties;

import org.apache.ibatis.ibator.api.IntrospectedColumn;
import org.apache.ibatis.ibator.api.JavaTypeResolver;
import org.apache.ibatis.ibator.api.dom.java.FullyQualifiedJavaType;
import org.apache.ibatis.ibator.config.IbatorContext;
import org.apache.ibatis.ibator.config.PropertyRegistry;
import org.apache.ibatis.ibator.internal.util.StringUtility;

/**
 * 
 * @author Jeff Butler
 */
public class JavaTypeResolverDefaultImpl implements JavaTypeResolver {

    protected List<String> warnings;

    protected Properties properties;

    protected IbatorContext ibatorContext;

    protected boolean forceBigDecimals;

    protected Map<Integer, JdbcTypeInformation> typeMap;

    public JavaTypeResolverDefaultImpl() {
        super();
        properties = new Properties();
        typeMap = new HashMap<Integer, JdbcTypeInformation>();

        typeMap.put(Types.ARRAY, new JdbcTypeInformation("ARRAY", //$NON-NLS-1$
                new FullyQualifiedJavaType(Object.class.getName())));
        typeMap.put(Types.BIGINT, new JdbcTypeInformation("BIGINT",  //$NON-NLS-1$
                new FullyQualifiedJavaType(Long.class.getName())));
        typeMap.put(Types.BINARY, new JdbcTypeInformation("BINARY", //$NON-NLS-1$
                new FullyQualifiedJavaType("byte[]"))); //$NON-NLS-1$
        typeMap.put(Types.BIT, new JdbcTypeInformation("BIT", //$NON-NLS-1$
                new FullyQualifiedJavaType(Boolean.class.getName())));
        typeMap.put(Types.BLOB, new JdbcTypeInformation("BLOB", //$NON-NLS-1$
                new FullyQualifiedJavaType("byte[]"))); //$NON-NLS-1$
        typeMap.put(Types.BOOLEAN, new JdbcTypeInformation("BOOLEAN", //$NON-NLS-1$
                new FullyQualifiedJavaType(Boolean.class.getName())));
        typeMap.put(Types.CHAR, new JdbcTypeInformation("CHAR", //$NON-NLS-1$
                new FullyQualifiedJavaType(String.class.getName())));
        typeMap.put(Types.CLOB, new JdbcTypeInformation("CLOB", //$NON-NLS-1$
                new FullyQualifiedJavaType(String.class.getName())));
        typeMap.put(Types.DATALINK, new JdbcTypeInformation("DATALINK", //$NON-NLS-1$
                new FullyQualifiedJavaType(Object.class.getName())));
        typeMap.put(Types.DATE, new JdbcTypeInformation("DATE", //$NON-NLS-1$
                new FullyQualifiedJavaType(Date.class.getName())));
        typeMap.put(Types.DISTINCT, new JdbcTypeInformation("DISTINCT", //$NON-NLS-1$
                new FullyQualifiedJavaType(Object.class.getName())));
        typeMap.put(Types.DOUBLE, new JdbcTypeInformation("DOUBLE", //$NON-NLS-1$
                new FullyQualifiedJavaType(Double.class.getName())));
        typeMap.put(Types.FLOAT, new JdbcTypeInformation("FLOAT", //$NON-NLS-1$
                new FullyQualifiedJavaType(Double.class.getName())));
        typeMap.put(Types.INTEGER, new JdbcTypeInformation("INTEGER", //$NON-NLS-1$
                new FullyQualifiedJavaType(Integer.class.getName())));
        typeMap.put(Types.JAVA_OBJECT, new JdbcTypeInformation("JAVA_OBJECT", //$NON-NLS-1$
                new FullyQualifiedJavaType(Object.class.getName())));
        typeMap.put(Types.LONGVARBINARY, new JdbcTypeInformation("LONGVARBINARY", //$NON-NLS-1$
                new FullyQualifiedJavaType("byte[]"))); //$NON-NLS-1$
        typeMap.put(Types.LONGVARCHAR, new JdbcTypeInformation("LONCVARCHAR", //$NON-NLS-1$
                new FullyQualifiedJavaType(String.class.getName())));
        typeMap.put(Types.NULL, new JdbcTypeInformation("NULL", //$NON-NLS-1$
                new FullyQualifiedJavaType(Object.class.getName())));
        typeMap.put(Types.OTHER, new JdbcTypeInformation("OTHER", //$NON-NLS-1$
                new FullyQualifiedJavaType(Object.class.getName())));
        typeMap.put(Types.REAL, new JdbcTypeInformation("REAL", //$NON-NLS-1$
                new FullyQualifiedJavaType(Float.class.getName())));
        typeMap.put(Types.REF, new JdbcTypeInformation("REF", //$NON-NLS-1$
                new FullyQualifiedJavaType(Object.class.getName())));
        typeMap.put(Types.SMALLINT, new JdbcTypeInformation("SMALLINT", //$NON-NLS-1$
                new FullyQualifiedJavaType(Short.class.getName())));
        typeMap.put(Types.STRUCT, new JdbcTypeInformation("STRUCT", //$NON-NLS-1$
                new FullyQualifiedJavaType(Object.class.getName())));
        typeMap.put(Types.TIME, new JdbcTypeInformation("TIME", //$NON-NLS-1$
                new FullyQualifiedJavaType(Date.class.getName())));
        typeMap.put(Types.TIMESTAMP, new JdbcTypeInformation("TIMESTAMP", //$NON-NLS-1$
                new FullyQualifiedJavaType(Date.class.getName())));
        typeMap.put(Types.TINYINT, new JdbcTypeInformation("TINYINT", //$NON-NLS-1$
                new FullyQualifiedJavaType(Byte.class.getName())));
        typeMap.put(Types.VARBINARY, new JdbcTypeInformation("VARBINARY", //$NON-NLS-1$
                new FullyQualifiedJavaType("byte[]"))); //$NON-NLS-1$
        typeMap.put(Types.VARCHAR, new JdbcTypeInformation("VARCHAR", //$NON-NLS-1$
                new FullyQualifiedJavaType(String.class.getName())));
    }

    public void addConfigurationProperties(Properties properties) {
        this.properties.putAll(properties);
        forceBigDecimals = StringUtility
                .isTrue(properties
                        .getProperty(PropertyRegistry.TYPE_RESOLVER_FORCE_BIG_DECIMALS));
    }

    /*
     * (non-Javadoc)
     * 
     * @see
     * org.apache.ibatis.ibator.api.JavaTypeResolver#initializeResolvedJavaType
     * (org.apache.ibatis.ibator.internal.db.ColumnDefinition)
     */
    public FullyQualifiedJavaType calculateJavaType(IntrospectedColumn introspectedColumn) {
        FullyQualifiedJavaType answer;
        JdbcTypeInformation jdbcTypeInformation = typeMap
                .get(introspectedColumn.getJdbcType());

        if (jdbcTypeInformation == null) {
            switch (introspectedColumn.getJdbcType()) {
            case Types.DECIMAL:
            case Types.NUMERIC:
                if (introspectedColumn.getScale() > 0
                        || introspectedColumn.getLength() > 18
                        || forceBigDecimals) {
                    answer = new FullyQualifiedJavaType(BigDecimal.class
                            .getName());
                } else if (introspectedColumn.getLength() > 9) {
                    answer = new FullyQualifiedJavaType(Long.class.getName());
                } else if (introspectedColumn.getLength() > 4) {
                    answer = new FullyQualifiedJavaType(Integer.class.getName());
                } else {
                    answer = new FullyQualifiedJavaType(Short.class.getName());
                }
                break;

            default:
                answer = null;
                break;
            }
        } else {
            answer = jdbcTypeInformation.getFullyQualifiedJavaType();
        }

        return answer;
    }

    /*
     * (non-Javadoc)
     * @see org.apache.ibatis.ibator.api.JavaTypeResolver#calculateJdbcTypeName(org.apache.ibatis.ibator.api.IntrospectedColumn)
     */
    public String calculateJdbcTypeName(IntrospectedColumn introspectedColumn) {
        String answer;
        JdbcTypeInformation jdbcTypeInformation = typeMap
                .get(introspectedColumn.getJdbcType());

        if (jdbcTypeInformation == null) {
            switch (introspectedColumn.getJdbcType()) {
            case Types.DECIMAL:
                answer = "DECIMAL"; //$NON-NLS-1$
                break;
            case Types.NUMERIC:
                answer = "NUMERIC"; //$NON-NLS-1$
                break;
            default:
                answer = null;
                break;
            }
        } else {
            answer = jdbcTypeInformation.getJdbcTypeName();
        }

        return answer;
    }
    
    /*
     * (non-Javadoc)
     * 
     * @see
     * org.apache.ibatis.ibator.api.JavaTypeResolver#setWarnings(java.util.List)
     */
    public void setWarnings(List<String> warnings) {
        this.warnings = warnings;
    }

    public void setIbatorContext(IbatorContext ibatorContext) {
        this.ibatorContext = ibatorContext;
    }

    private static class JdbcTypeInformation {
        private String jdbcTypeName;

        private FullyQualifiedJavaType fullyQualifiedJavaType;

        public JdbcTypeInformation(String jdbcTypeName,
                FullyQualifiedJavaType fullyQualifiedJavaType) {
            this.jdbcTypeName = jdbcTypeName;
            this.fullyQualifiedJavaType = fullyQualifiedJavaType;
        }

        public String getJdbcTypeName() {
            return jdbcTypeName;
        }

        public FullyQualifiedJavaType getFullyQualifiedJavaType() {
            return fullyQualifiedJavaType;
        }
    }
}