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/*  Copyright 1999 Vince Via [email protected]
    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 com.viaoa.datasource.jdbc.delegate;

import java.lang.reflect.Method;

import com.viaoa.datasource.jdbc.OADataSourceJDBC;
import com.viaoa.datasource.jdbc.db.Column;
import com.viaoa.datasource.jdbc.db.DBMetaData;
import com.viaoa.datasource.jdbc.db.Database;
import com.viaoa.datasource.jdbc.db.Index;
import com.viaoa.datasource.jdbc.db.Table;
import com.viaoa.datasource.jdbc.query.QueryConverter;

/**
 * Used to get additional information about a JDBC DataSource.
 * 
 * @author vvia
 */
public class Delegate {

	/**
	 * Returns max length allowed for a property. returns "-1" for any length
	 */
	public static int getPropertyMaxLength(OADataSourceJDBC ds, Class c, String propertyName) {
		QueryConverter qc = new QueryConverter(ds);
		Class[] classes = qc.getSelectClasses(c);

		for (int i = 0; classes != null && i < classes.length; i++) {
			Table table = ds.getDatabase().getTable(classes[i]);
			if (table == null) {
				continue;
			}
			Column[] columns = table.getSelectColumns();
			for (int ii = 0; columns != null && ii < columns.length; ii++) {
				if (propertyName.equalsIgnoreCase(columns[ii].propertyName)) {
					return getMaxLength(columns[ii]);
				}
			}
		}
		return -1;
	}

	public static int getPropertyMaxLength(Database database, Class c, String propertyName) {
		for (Table table : database.getTables()) {
			Column[] columns = table.getSelectColumns();
			for (int ii = 0; columns != null && ii < columns.length; ii++) {
				if (propertyName.equalsIgnoreCase(columns[ii].propertyName)) {
					return getMaxLength(columns[ii]);
				}
			}
		}
		return -1;
	}

	public static int getMaxLength(Column c) {
		if (c == null) {
			return -1;
		}
		Method m = c.getGetMethod();
		if (m != null) {
			if (m.getReturnType().equals(String.class)) {
				if (c.maxLength < 256) {
					int type = c.getSqlType();
					if (type == 0 || type == java.sql.Types.VARCHAR || type == java.sql.Types.CHAR) {
						return c.maxLength;
					}
				}
			}
			return -1;
		}
		return c.maxLength;
	}

	public static void adjustDatabase(OADataSourceJDBC ds) {
		if (ds == null) {
			return;
		}
		Database database = ds.getDatabase();
		DBMetaData dbmd = ds.getDBMetaData();

		Table[] tables = database.getTables();
		for (int i = 0; i < tables.length; i++) {
			Table t = tables[i];
			Column[] columns = t.getColumns();
			for (int j = 0; j < columns.length; j++) {
				Column c = columns[j];
				if (c.type != java.sql.Types.VARCHAR) {
					continue;
				}
				if (c.caseSensitive) {
					continue;
				}

				boolean bLower = (c.columnLowerName != null && c.columnLowerName.toUpperCase().endsWith("LOWER"));
				if (!bLower && !dbmd.caseSensitive) {
					continue;
				}

				Index[] indexes = t.getIndexes();
				for (int k = 0; k < indexes.length; k++) {
					Index ind = indexes[k];
					for (int kk = 0; kk < ind.columns.length; kk++) {
						if (!ind.columns[kk].equalsIgnoreCase(c.columnName)) {
							if (!ind.columns[kk].equalsIgnoreCase(c.columnLowerName)) {
								continue;
							}
						}
						if (dbmd.caseSensitive) {
							c.columnLowerName = c.columnName + "Lower";
							ind.columns[kk] = c.columnName + "Lower";
						} else {
							ind.columns[kk] = c.columnName;
							c.columnLowerName = null;
						}
					}
				}
			}
		}
	}

}