/*
 * This file is part of Nuts Framework.
 * Copyright(C) 2009-2012 Nuts Develop Team.
 *
 * Nuts Framework is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License any later version.
 *
 * Nuts Framework 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 Nuts Framework. If not, see <http://www.gnu.org/licenses/>.
 */
package nuts.tools.sql;

import java.io.FileInputStream;
import java.io.InputStreamReader;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

import nuts.core.io.CsvReader;
import nuts.core.lang.StringUtils;
import nuts.core.orm.sql.SqlExecutor;
import nuts.core.orm.sql.engine.SimpleSqlExecutor;

import org.apache.commons.cli.CommandLine;

/**
 * Import data from csv to database
 */
public class CsvDataImportor extends AbstractDataImportor {
	/**
	 * Main class
	 */
	public static class Main extends AbstractDataImportor.Main {
		/**
		 * @param args arguments
		 */
		public static void main(String[] args) {
			Main cgm = new Main();
			
			Object cg = new CsvDataImportor();

			cgm.execute(cg, args);
		}

		@Override
		protected void addCommandLineOptions() throws Exception {
			super.addCommandLineOptions();
			
			addCommandLineOption("c", "charset", "charset");
		}

		@Override
		protected void getCommandLineOptions(CommandLine cl) throws Exception {
			super.getCommandLineOptions(cl);
			
			if (cl.hasOption("c")) {
				setParameter("charset", cl.getOptionValue("c").trim());
			}
		}
	}
	
	/**
	 * Constructor
	 */
	public CsvDataImportor() {
		includes = new String[] { "**/*.csv" };
	}

	//---------------------------------------------------------------------------------------
	// properties
	//---------------------------------------------------------------------------------------
	protected String charset;
	
	/**
	 * @return the charset
	 */
	public String getCharset() {
		return charset;
	}

	/**
	 * @param charset the charset to set
	 */
	public void setCharset(String charset) {
		this.charset = charset;
	}

	@Override
	protected void importFile(FileInputStream fis) throws Exception {
		InputStreamReader isr;
		if (StringUtils.isEmpty(charset)) {
			isr = new InputStreamReader(fis);
		}
		else {
			isr = new InputStreamReader(fis, charset);
		}

		CsvReader csv = new CsvReader(isr);
		impCsvData(csv);
	}
	
	private void impCsvData(CsvReader csv) throws Exception {
		List<String> tns = csv.readNext();
		if (tns == null || tns.isEmpty()) {
			throw new Exception("[" + currentFile.getName() + "] - the table name is empty!");
		}
		
		String tableName = tns.get(0);
		
		List<String> columns = csv.readNext();
		if (columns == null || columns.isEmpty()) {
			throw new Exception("[" + tableName + "] - the table column is empty!");
		}
		
		List<String> row2 = csv.readNext();
		if (row2 == null || row2.size() != columns.size()) {
			throw new Exception("[" + tableName + "] - the column types is incorrect!");
		}
		
		List<DataType> types = new ArrayList<DataType>();
		for (String v : row2) {
			types.add(new DataType(v));
		}
		
		println2("Importing table: " + tableName);
		if (truncate) {
			truncateTable(tableName);
		}

		String insertSql = getInsertSql(tableName, columns, types);
		try {
			SqlExecutor executor = new SimpleSqlExecutor(connection); 

			int cnt = 0;
			for (int i = 3; ; i++) {
				Map<String, Object> values = getRowValues(csv, i, columns, types);
				if (values == null) {
					break;
				}
				cntRecord += executor.update(insertSql, values);
				cnt++;
				if (commit > 0 && cnt >= commit) {
					connection.commit();
				}
			}

			if (cnt > 0) {
				connection.commit();
			}
		}
		catch (Exception e) {
			rollback();
			throw new Exception("Failed to import table [" + tableName + "]", e);
		}
	}	

	private Map<String, Object> getRowValues(CsvReader csv, int r, List<String> columns, List<DataType> types) throws Exception {
		List<String> row = csv.readNext();
		if (row == null) {
			return null;
		}

		boolean empty = true;
		
		Map<String, Object> values = new HashMap<String, Object>(columns.size());
		for (int c = 0; c < columns.size(); c++) {
			String v = null;
			if (c < row.size()) {
				v = row.get(c);
			}
			
			try {
				Object cv = getCellValue(v, c, types);

				empty = (cv == null);

				values.put(columns.get(c), cv);
			}
			catch (Exception e) {
				throw new Exception("value is incorrect: (" + r + "," + c + ") - " + v, e);
			}
		}
		
		return empty ? null : values;
	}
}
