/******************************************************************************
 * Product: Adempiere ERP & CRM Smart Business Solution                       *
 * Copyright (C) 2010 Heng Sin Low                							  *
 * This program is free software; you can redistribute it and/or modify it    *
 * under the terms version 2 of the GNU General Public License as published   *
 * by the Free Software Foundation. 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 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.,    *
 * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.                     *
 *****************************************************************************/
package org.adempiere.base;

import java.lang.reflect.Constructor;
import java.sql.ResultSet;
import java.util.logging.Level;

import org.compiere.acct.Doc;
import org.compiere.model.MAcctSchema;
import org.compiere.model.MTable;
import org.compiere.util.AdempiereUserError;
import org.compiere.util.CLogger;
import org.compiere.util.Env;

/**
 * Default {@link IDocFactory} implementation from core.<br/>
 * Load {@link Doc} instance from class path.
 * @author hengsin
 *
 */
public class DefaultDocumentFactory implements IDocFactory {

	private final static CLogger s_log = CLogger.getCLogger(DefaultDocumentFactory.class);

	@Override
	public Doc getDocument(MAcctSchema as, int AD_Table_ID, ResultSet rs,
			String trxName) {
		Doc doc = null;

		/* Classname of the Doc class follows this convention:
		 * if the prefix (letters before the first underscore _) is 1 character, then the class is Doc_TableWithoutPrefixWithoutUnderscores
		 * otherwise Doc_WholeTableWithoutUnderscores
		 * i.e. following this query
              SELECT t.ad_table_id, tablename,
              	CASE
              		WHEN instr(tablename, '_') = 2
              		THEN 'Doc_' || substr(tablename, 3)
              		WHEN instr(tablename, '_') > 2
              		THEN 'Doc_' ||
              		ELSE ''
              	REPLACE
              		(
              			tablename, '_', ''
              		)
              	END AS classname
              FROM ad_table t, ad_column C
              WHERE t.ad_table_id = C.ad_table_id AND
              	C.columnname = 'Posted' AND
              	isview = 'N'
              ORDER BY 1
		 * This is:
		 * 224		GL_Journal			Doc_GLJournal
		 * 259		C_Order				Doc_Order
		 * 318		C_Invoice			Doc_Invoice
		 * 319		M_InOut				Doc_InOut
		 * 321		M_Inventory			Doc_Inventory
		 * 323		M_Movement			Doc_Movement
		 * 325		M_Production		Doc_Production
		 * 335		C_Payment			Doc_Payment
		 * 392		C_BankStatement		Doc_BankStatement
		 * 407		C_Cash				Doc_Cash
		 * 472		M_MatchInv			Doc_MatchInv
		 * 473		M_MatchPO			Doc_MatchPO
		 * 623		C_ProjectIssue		Doc_ProjectIssue
		 * 702		M_Requisition		Doc_Requisition
		 * 735		C_AllocationHdr		Doc_AllocationHdr
		 * 53027	PP_Order			Doc_PPOrder
		 * 53035	PP_Cost_Collector	Doc_PPCostCollector
		 * 53037	DD_Order			Doc_DDOrder
		 * 53092	HR_Process			Doc_HRProcess
		 */

		String tableName = MTable.getTableName(Env.getCtx(), AD_Table_ID);
		String packageName = "org.compiere.acct";
		String className = null;

		int firstUnderscore = tableName.indexOf("_");
		if (firstUnderscore == 1)
			className = packageName + ".Doc_" + tableName.substring(2).replaceAll("_", "");
		else
			className = packageName + ".Doc_" + tableName.replaceAll("_", "");

		try
		{
			Class<?> cClass = Class.forName(className);
			Constructor<?> cnstr = cClass.getConstructor(new Class[] {MAcctSchema.class, ResultSet.class, String.class});
			doc = (Doc) cnstr.newInstance(as, rs, trxName);
		}
		catch (Exception e)
		{
			s_log.log(Level.SEVERE, "Doc Class invalid: " + className + " (" + e.toString() + ")");
			throw new AdempiereUserError("Doc Class invalid: " + className + " (" + e.toString() + ")");
		}

		if (doc == null)
			s_log.log(Level.SEVERE, "Unknown AD_Table_ID=" + AD_Table_ID);
		return doc;
	}

}