package eu.dnetlib.enabling.database.utils;

import java.io.StringReader;
import java.sql.Array;
import java.sql.Connection;
import java.sql.Date;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.ResultSetMetaData;
import java.sql.SQLException;
import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.Set;
import java.util.concurrent.ArrayBlockingQueue;
import java.util.concurrent.BlockingQueue;
import java.util.concurrent.Executors;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.atomic.AtomicReference;
import java.util.regex.Pattern;

import javax.sql.DataSource;

import org.apache.commons.lang.BooleanUtils;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.apache.velocity.app.VelocityEngine;
import org.dom4j.Document;
import org.dom4j.DocumentHelper;
import org.dom4j.Element;
import org.dom4j.Node;
import org.dom4j.io.SAXReader;
import org.joda.time.DateTime;
import org.joda.time.format.ISODateTimeFormat;
import org.springframework.beans.factory.annotation.Required;
import org.springframework.dao.DataAccessException;
import org.springframework.jdbc.core.JdbcTemplate;
import org.springframework.jdbc.support.rowset.SqlRowSet;
import org.springframework.transaction.support.TransactionTemplate;
import org.springframework.ui.velocity.VelocityEngineUtils;

import com.google.common.collect.Lists;
import com.google.common.collect.Queues;
import com.google.common.collect.Sets;

import eu.dnetlib.enabling.database.DataSourceFactory;
import eu.dnetlib.enabling.database.TransactionTemplateFactory;
import eu.dnetlib.enabling.database.objects.DnetDatabase;
import eu.dnetlib.enabling.database.rmi.DatabaseException;
import eu.dnetlib.miscutils.datetime.DateUtils;
import eu.dnetlib.miscutils.functional.string.Sanitizer;

public class DatabaseUtils {

	public static final String DNET_RESOURCE_ID_FIELD = "_dnet_resource_identifier_";
	public static final int BLOCKING_QUEUE_TIMEOUT = 300;
	private static final String SQL_DATE_FORMAT = "yyyy-MM-dd";
	private static final Log log = LogFactory.getLog(DatabaseUtils.class); // NOPMD by marko on 11/24/08 5:02 PM
	private static final int BLOCKING_QUEUE_SIZE = 200;
	private static final Set<String> TRUE_VALUES = Sets.newHashSet("true", "t", "yes", "y", "vero", "v");
	private static final Set<String> FALSE_VALUES = Sets.newHashSet("false", "f", "no", "n", "falso");
	private DataSourceFactory dataSourceFactory;
	private JdbcTemplateFactory jdbcTemplateFactory;
	private TransactionTemplateFactory transactionTemplateFactory;
	private String defaultDB;
	private VelocityEngine velocityEngine;
	private String dbPrefix;
	private int numbersOfRecordsForTransaction;
	private int fetchSize = 100;

	public List<String> listCommonDBTables(final String database) throws DatabaseException {
		final String query =
			"SELECT table_name FROM information_schema.tables " + "WHERE table_schema = 'public' " + "AND table_type != 'VIEW' "
				+ "AND table_name NOT LIKE '%_log'";
		return getTypedListFromSql(database, query, String.class);
	}

	public List<String> listCommonDBViews(final String database) throws DatabaseException {
		final String query =
			"SELECT table_name FROM information_schema.tables " + "WHERE table_schema = 'public' " + "AND table_type = 'VIEW' "
				+ "AND table_name NOT LIKE '%_log'";
		return getTypedListFromSql(database, query, String.class);
	}

	public Map<String, TableDates> getTableDatesForDB(final String db) throws DatabaseException {
		final Map<String, TableDates> res = new HashMap<>();

		for (final String table : listCommonDBTables(db)) {
			try {
				final TableDates dates = new TableDates();

				final String query =
					"select lastinsert, lastupdate, lastdelete from " + "(select max(date) as lastinsert from " + table
						+ "_log where operation='insert') as t1, " + "(select max(date) as lastupdate from " + table
						+ "_log where operation='update') as t2, " + "(select max(date) as lastdelete from " + table
						+ "_log where operation='delete') as t3";

				final SqlRowSet srs = executeSql(db, query, SqlRowSet.class);
				if (srs.next()) {
					dates.setLastInsert(srs.getDate("lastinsert"));
					dates.setLastUpdate(srs.getDate("lastupdate"));
					dates.setLastDelete(srs.getDate("lastdelete"));
				}
				res.put(table, dates);
			} catch (final Exception e) {
				log.warn("Error obtaing dates for table " + table, e);
			}
		}
		return res;
	}

	public List<DnetDatabase> listAllDatabases() throws DatabaseException {
		final String query =
			"SELECT d.datname AS db, COALESCE(dsc.description,'')='isManaged' AS managed FROM pg_database d LEFT OUTER JOIN pg_shdescription dsc ON (d.oid = dsc.objoid) WHERE d.datname LIKE '"
				+ dbPrefix + "%' ORDER BY d.datname DESC";
		final JdbcTemplate jdbcTemplate = getJdbcTemplate(defaultDB);

		final List<DnetDatabase> list = Lists.newArrayList();
		for (final Map<String, Object> map : jdbcTemplate.queryForList(query)) {
			list.add(new DnetDatabase(map.get("db").toString(), Boolean.parseBoolean(map.get("managed").toString())));
		}
		return list;

	}

	public <T> List<T> getTypedListFromSql(final String dbName, final String query, final Class<T> clazz) throws DatabaseException {
		try {
			final List<T> list = new ArrayList<>();
			for (final Object obj : getJdbcTemplate(dbName).queryForList(query, clazz)) {
				list.add(clazz.cast(obj));
			}
			return list;
		} catch (final DataAccessException e) {
			throw new DatabaseException(e);
		}
	}

	public List<String> getSimpleListFromSql(final String dbName, final String query) throws DatabaseException {

		final JdbcTemplate jdbcTemplate = getJdbcTemplate(dbName);

		try {
			final List<String> list = new ArrayList<>();
			for (final Object obj : jdbcTemplate.queryForList(query)) {
				list.add(obj.toString());
			}
			return list;
		} catch (final DataAccessException e) {
			throw new DatabaseException(e);
		}
	}

	public void executeSql(final String db, final String query) throws DatabaseException {
		executeSql(db, query, Void.class);
	}

	@SuppressWarnings("unchecked")
	public <T> T executeSql(final String dbName, final String query, final Class<T> clazz) throws DatabaseException {

		if (clazz == BlockingQueue.class) {
			log.debug("Creating Queue");

			final ArrayBlockingQueue<Document> queue = Queues.newArrayBlockingQueue(BLOCKING_QUEUE_SIZE);
			Executors.newSingleThreadExecutor().submit(() -> {
				final DataSource ds = dataSourceFactory.createDataSource(dbName);
				try (final Connection con = getConnection(ds);
					final PreparedStatement stm = getStm(query, con);
					final ResultSet rs = stm.executeQuery()) {

					rs.setFetchSize(getFetchSize());
					boolean timeout = false;
					log.info(String.format("[Thread Id %s] starting to populate queue", Thread.currentThread().getId()));
					while (rs.next()) {
						final ResultSetMetaData md = rs.getMetaData();
						final Map<String, Object> row = new HashMap<>();
						for (int i = 1; i <= md.getColumnCount(); i++) {
							row.put(md.getColumnName(i), rs.getObject(i));
						}
						if (!enqueue(queue, row)) {
							timeout = true;
							break;
						}
					}
					if (timeout) {
						log.warn(String.format("[Thread Id %s] queue full, consumer did not consume for %s seconds, I give up", Thread.currentThread()
							.getId(), BLOCKING_QUEUE_TIMEOUT));
						return;
					}
					// An empty Map indicates the end of the resultset
					enqueue(queue, new HashMap<>());
				} catch (SQLException | DatabaseException e) {
					throw new RuntimeException(e);
				}
			});

			log.debug("Returned Queue");

			return (T) queue;
		}

		final JdbcTemplate jdbcTemplate = jdbcTemplateFactory.createJdbcTemplate(dbName);
		if (clazz == Integer.class) {
			return (T) jdbcTemplate.queryForObject(query, Integer.class);
		} else if (clazz == List.class) {
			return (T) jdbcTemplate.queryForList(query);
		} else if (clazz == Map.class) {
			return (T) jdbcTemplate.queryForMap(query);
		} else if (clazz == SqlRowSet.class) {
			return (T) jdbcTemplate.queryForRowSet(query);
		} else {
			jdbcTemplate.update(query);
			return null;
		}
	}

	private boolean enqueue(final ArrayBlockingQueue<Document> q, final Map<String, Object> row) throws DatabaseException {
		try {
			return q.offer(rowToDocument(row), BLOCKING_QUEUE_TIMEOUT, TimeUnit.SECONDS);
		} catch (final InterruptedException e) {
			log.error("Error putting element in queue");
			throw new RuntimeException(e);
		}
	}

	private PreparedStatement getStm(final String query, final Connection con) throws SQLException {
		final PreparedStatement stm = con.prepareStatement(query, ResultSet.TYPE_FORWARD_ONLY);
		stm.setFetchSize(getFetchSize());
		return stm;
	}

	private Connection getConnection(final DataSource dataSource) throws SQLException {
		final Connection conn = dataSource.getConnection();
		conn.setAutoCommit(false);
		return conn;
	}

	public boolean contains(final String db, final String table, final String column, final String value) throws DatabaseException {
		String query = "";
		try {
			verifyParameters(db, table, column);
			query = "SELECT " + column + " FROM " + table + " WHERE " + column + " = '" + value + "'";
			final List<String> res = getSimpleListFromSql(db, query);
			return res != null && res.size() > 0;
		} catch (final Throwable e) {
			throw new DatabaseException("Error performing SQL: " + query, e);
		}
	}

	public List<Map<?, ?>> describeTable(final String database, final String table) throws DatabaseException {
		verifyParameters(database, table);

		try {
			final JdbcTemplate jdbcTemplate = getJdbcTemplate(database);
			final List<Map<?, ?>> response = new ArrayList<>();
			final String query = "SELECT * FROM information_schema.columns WHERE table_name = ?";

			for (final Object o : jdbcTemplate.queryForList(query, new Object[] {
				table
			})) {
				if (o instanceof Map<?, ?>) {
					response.add((Map<?, ?>) o);
				}
			}
			return response;
		} catch (final DataAccessException e) {
			throw new DatabaseException(e);
		}
	}

	public String dumpTableAsXML(final String db, final String t) throws DatabaseException {
		return dumpTableAsDoc(db, t).asXML();
	}

	public Document dumpTableAsDoc(final String db, final String t) throws DatabaseException {
		final Document doc = DocumentHelper.createDocument();

		final Element root = doc.addElement("DB_TABLE");
		final Element head = root.addElement("HEADER");

		head.addElement("DATABASE").addAttribute("value", db);
		head.addElement("TABLE").addAttribute("value", t);
		head.addElement("DATE").addAttribute("value", DateUtils.now_ISO8601());

		final Element body = root.addElement("BODY");
		for (final Document d : dumpTableAsList(db, t)) {
			body.add(d.getRootElement());
		}
		return doc;
	}

	public List<Document> dumpTableAsList(final String db, final String t) throws DatabaseException {
		final JdbcTemplate jdbcTemplate = getJdbcTemplate(db);

		final List<Document> list = new ArrayList<>();
		for (final Object o : jdbcTemplate.queryForList("SELECT * FROM " + t)) {
			if (o instanceof Map<?, ?>) {
				list.add(rowToDocument((Map<?, ?>) o));
			}
		}
		return list;
	}

	public Document rowToDocument(final Map<?, ?> map) throws DatabaseException {
		final Document doc = DocumentHelper.createDocument();
		final Element row = doc.addElement("ROW");

		for (final Map.Entry<?, ?> entry : map.entrySet()) {
			final Element col = row.addElement("FIELD");
			col.addAttribute("name", "" + entry.getKey());
			addValue(col, entry.getValue());
		}
		return doc;
	}

	public Document getRowByResourceId(final String database, final String table, final String resourceId) throws DatabaseException {
		verifyParameters(database, table);

		final JdbcTemplate jdbcTemplate = getJdbcTemplate(database);
		final String query = "SELECT * FROM " + table + " WHERE " + DNET_RESOURCE_ID_FIELD + "=?";

		final Map<?, ?> map = jdbcTemplate.queryForMap(query, resourceId);
		final Document doc = DocumentHelper.createDocument();

		final Element root = doc.addElement("DB_RECORD");
		final Element head = root.addElement("HEADER");
		head.addElement("RESOURCE_IDENTIFIER").addAttribute("value", resourceId);
		head.addElement("DATABASE").addAttribute("value", database);
		head.addElement("TABLE").addAttribute("value", table);
		head.addElement("DATE").addAttribute("value", DateUtils.now_ISO8601());

		final Element body = root.addElement("BODY");

		final Element row = body.addElement("ROW");

		for (final Map.Entry<?, ?> entry : map.entrySet()) {
			final Element col = row.addElement("FIELD");
			col.addAttribute("name", "" + entry.getKey());
			addValue(col, entry.getValue());
		}

		return doc;
	}

	private void addValue(final Element elem, final Object value) throws DatabaseException {
		if (value instanceof Array) {
			try {
				final Array arrayValue = (Array) value;
				for (final Object o : (Object[]) arrayValue.getArray()) {
					addValue(elem.addElement("ITEM"), o);
				}
			} catch (final Exception e) {
				log.error(e);
				throw new DatabaseException("Error procsessing a Array", e);
			}
		} else if (value != null) {
			elem.addText(Sanitizer.sanitize(value.toString()));
		} else {
			elem.addAttribute("isNull", "true");
		}
	}

	private void verifyParameters(final String... params) throws DatabaseException {
		final Pattern pattern = Pattern.compile("\\w{1,128}");

		for (final String p : params) {
			log.debug("TESTING SQL PARAM:" + p);
			if (p == null) {
				throw new DatabaseException("Parameter is null");
			} else if (!pattern.matcher(p).matches()) {
				throw new DatabaseException("Parameter [" + p + "] contains an invalid character");
			} else {
				log.debug("TEST OK");
			}
		}
	}

	public void importFromIterable(final String db, final Iterable<String> iterable) throws DatabaseException {
		verifyParameters(db);

		final DataSource dataSource = dataSourceFactory.createDataSource(db);
		final JdbcTemplate jdbcTemplate = getJdbcTemplate(db);
		final TransactionTemplate transactionTemplate = transactionTemplateFactory.createTransactionTemplate(dataSource);

		int counterTotal = 0;

		final long start = DateUtils.now();

		final List<GenericRow> rows = new ArrayList<>();
		for (final String prof : iterable) {
			rows.addAll(obtainListOfRows(prof));
			if (rows.size() > numbersOfRecordsForTransaction) {
				counterTotal += rows.size();
				importTransaction(jdbcTemplate, transactionTemplate, rows);
				rows.clear();
			}
		}
		counterTotal += rows.size();
		importTransaction(jdbcTemplate, transactionTemplate, rows);

		final long end = DateUtils.now();

		log.info("**********************************************************");
		log.info("Processed " + counterTotal + " rows in " + (end - start) / 1000 + " seconds");
		log.info("**********************************************************");
	}

	private void importTransaction(final JdbcTemplate jdbcTemplate, final TransactionTemplate transactionTemplate, final List<GenericRow> rows)
		throws DatabaseException {
		if (rows != null && rows.size() > 0) {
			importTransactionInternal(jdbcTemplate, transactionTemplate, rows);
		}
	}

	private List<GenericRow> importTransactionInternal(final JdbcTemplate jdbcTemplate,
		final TransactionTemplate transactionTemplate,
		final List<GenericRow> rows) throws DatabaseException {

		final AtomicReference<DatabaseException> error = new AtomicReference<>();

		try {
			return transactionTemplate.execute(status -> {
				final List<GenericRow> ok = Lists.newArrayList();
				try {
					for (final GenericRow row : rows) {
						if (row.isToDelete()) {
							deleteRow(jdbcTemplate, row.getTable(), row.getFields());
						} else {
							addOrUpdateRow(jdbcTemplate, row.getTable(), row.getFields());
						}
						ok.add(row);
					}
				} catch (final DatabaseException e) {
					log.warn("Transaction failed", e);
					status.setRollbackOnly();
					error.set(e);
				}
				return ok;
			});
		} finally {
			if (error.get() != null) { throw error.get(); }
		}
	}

	protected void addOrUpdateRow(final JdbcTemplate jdbcTemplate, final String table, final Map<String, Object> rowFields) throws DatabaseException {
		try {

			if (log.isDebugEnabled()) {
				log.debug("Adding or updating element to table " + table);
			}
			verifyParameters(table);
			verifyParameters(rowFields.keySet().toArray(new String[rowFields.size()]));

			String fields = "";
			String values = "";
			final List<Object> list = new ArrayList<>();

			for (final Map.Entry<String, Object> e : rowFields.entrySet()) {
				if (!fields.isEmpty()) {
					fields += ",";
				}
				fields += e.getKey();
				if (!values.isEmpty()) {
					values += ",";
				}
				values += "?";
				list.add(e.getValue());
			}

			int count = 0;
			if (rowFields.containsKey(DNET_RESOURCE_ID_FIELD)) {
				final List<Object> list2 = new ArrayList<>();
				list2.addAll(list);
				list2.add(rowFields.get(DNET_RESOURCE_ID_FIELD));
				count =
					jdbcTemplate.update("UPDATE " + table + " SET (" + fields + ") = (" + values + ") WHERE " + DNET_RESOURCE_ID_FIELD + "=?", list2.toArray());
			}
			if (count == 0) {
				jdbcTemplate.update("INSERT INTO " + table + " (" + fields + ") VALUES (" + values + ")", list.toArray());
			}
		} catch (final Exception e) {
			throw new DatabaseException("Error adding or updating record", e);
		}
	}

	protected void deleteRow(final JdbcTemplate jdbcTemplate, final String table, final Map<String, Object> rowFields) throws DatabaseException {
		if (log.isDebugEnabled()) {
			log.debug("Deleting element from table " + table);
		}
		verifyParameters(table);
		verifyParameters(rowFields.keySet().toArray(new String[rowFields.size()]));

		final List<Object> list = new ArrayList<>();

		String where = "";

		for (final Map.Entry<String, Object> e : rowFields.entrySet()) {
			if (!where.isEmpty()) {
				where += " AND ";
			}
			where += e.getKey() + "=?";
			list.add(e.getValue());
		}

		if (where.isEmpty()) { throw new DatabaseException("Delete condition is empty"); }
		final int n = jdbcTemplate.update("DELETE FROM " + table + " WHERE " + where, list.toArray());

		if (log.isDebugEnabled()) {
			log.debug("Number of Deleted records: " + n);
		}
	}

	public void deleteRowByResourceId(final String database, final String table, final String resourceIdentifier) throws DatabaseException {
		verifyParameters(database, table, resourceIdentifier);
		final JdbcTemplate jdbcTemplate = getJdbcTemplate(database);
		jdbcTemplate.update("DELETE FROM " + table + " WHERE " + DNET_RESOURCE_ID_FIELD + "=?", resourceIdentifier);
	}

	public void clearTable(final String database, final String table) throws DatabaseException {
		verifyParameters(database, table);

		final JdbcTemplate jdbcTemplate = getJdbcTemplate(database);
		jdbcTemplate.update("DELETE FROM " + table);
	}

	public void prepareManagementOfTable(final String database, final String table) throws DatabaseException {
		verifyParameters(database, table);
		final JdbcTemplate jdbcTemplate = getJdbcTemplate(database);

		if (!isManagedTable(jdbcTemplate, table)) {
			jdbcTemplate.update(getSQLFromTemplate("manageTable", database, table, null));
			log.info("Added management of table " + table);
		}
	}

	public void removeManagementOfTable(final String database, final String table) throws DatabaseException {
		verifyParameters(database, table);
		final JdbcTemplate jdbcTemplate = getJdbcTemplate(database);

		if (isManagedTable(jdbcTemplate, table)) {
			jdbcTemplate.update(getSQLFromTemplate("unmanageTable", database, table, null));
			log.info("Removed management of table " + table);
		}
	}

	public boolean isManagedTable(final String database, final String table) throws DatabaseException {
		verifyParameters(database, table);
		final JdbcTemplate jdbcTemplate = getJdbcTemplate(database);
		return isManagedTable(jdbcTemplate, table);
	}

	private boolean isManagedTable(final JdbcTemplate jdbcTemplate, final String table) {
		return jdbcTemplate
			.queryForObject("SELECT count(*) FROM information_schema.columns WHERE table_name = ? AND column_name = ?", Integer.class, table, DNET_RESOURCE_ID_FIELD) == 1;
	}

	public boolean isLoggedTable(final String database, final String table) throws DatabaseException {
		verifyParameters(database, table);
		final JdbcTemplate jdbcTemplate = getJdbcTemplate(database);
		return isLoggedTable(jdbcTemplate, table);
	}

	private boolean isLoggedTable(final JdbcTemplate jdbcTemplate, final String table) {
		return jdbcTemplate.queryForObject("SELECT count(*) FROM information_schema.tables WHERE table_name = ?", Integer.class, table + "_log") == 1;
	}

	public String getDefaultDnetIdentifier(final String database, final String table) throws DatabaseException {
		verifyParameters(database, table);
		final JdbcTemplate jdbcTemplate = getJdbcTemplate(database);
		if (isManagedTable(jdbcTemplate, table)) {
			return jdbcTemplate.queryForObject("SELECT column_default FROM information_schema.columns WHERE table_name = ? AND column_name = ?", new Object[] {
				table, DNET_RESOURCE_ID_FIELD
			}, String.class);
		}
		return "";
	}

	public void reassignDefaultDnetIdentifiers(final String db) throws DatabaseException {
		for (final String t : listCommonDBTables(db)) {
			reassignDefaultDnetIdentifiers(db, t);
		}
	}

	public void reassignDefaultDnetIdentifiers(final String db, final String t) throws DatabaseException {
		if (!isManagedTable(db, t)) { return; }

		final SqlRowSet rows =
			executeSql(db, "SELECT pg_attribute.attname as pkey FROM pg_index, pg_class, pg_attribute " + "WHERE pg_class.oid = '" + t + "'::regclass "
				+ "AND indrelid = pg_class.oid " + "AND pg_attribute.attrelid = pg_class.oid "
				+ "AND pg_attribute.attnum = any(pg_index.indkey) AND indisprimary " + "ORDER BY pkey", SqlRowSet.class);

		String defaultValue = "";
		while (rows.next()) {
			if (!defaultValue.isEmpty()) {
				defaultValue += "||'@@'||";
			}
			defaultValue += rows.getString("pkey");
		}
		executeSql(db, "UPDATE " + t + " SET " + DatabaseUtils.DNET_RESOURCE_ID_FIELD + " = " + defaultValue);
		log.info("Reassigned dnetId for table " + t);
	}

	public String getSQLFromTemplate(final String sqlTemplate, final String db, final String table, Map<String, Object> map) {
		if (map == null) {
			map = new HashMap<>();
		}

		map.put("mainDB", defaultDB);
		map.put("db", db);
		map.put("table", table);
		map.put("idField", DNET_RESOURCE_ID_FIELD);

		return VelocityEngineUtils.mergeTemplateIntoString(velocityEngine, "eu/dnetlib/enabling/database/velocity/" + sqlTemplate + ".sql.vm", "UTF-8", map);
	}

	public List<GenericRow> obtainListOfRows(final String xml) throws DatabaseException {
		try {
			final Document doc = new SAXReader().read(new StringReader(xml));

			final List<GenericRow> list = new ArrayList<>();

			for (final Object or : doc.selectNodes("//ROW")) {
				final Element row = (Element) or;

				final String table = row.valueOf("@table");

				if (table == null || table.isEmpty()) { throw new DatabaseException("Attribute table is missing in XSLT"); }

				final boolean toDelete = "deleted".equals(row.valueOf("@status"));

				final Map<String, Object> fields = new HashMap<>();

				for (final Object of : row.selectNodes("./FIELD")) {
					final Node node = (Node) of;
					final String key = node.valueOf("@name");
					final String type = node.valueOf("@type");
					final String format = node.valueOf("@format");
					final String valueS = node.getText().trim();

					if (key != null && !key.isEmpty()) {

						final Object value;
						if (type == null || type.isEmpty()) {
							// String types (text, char(), varchar())
							value = valueS;
						} else {
							try {
								// type array should be evaluated before the null object
								if (type.equals("array")) {
									final List<String> arrayItems = new ArrayList<>();
									for (final Object oi : node.selectNodes("./ITEM")) {
										arrayItems.add(((Node) oi).getText());
									}
									value = new SqlTextArrayValue(arrayItems.toArray(new String[arrayItems.size()]));
								} else if ("".equals(valueS)) {
									// an empty string in a typed field means null
									value = null;
								} else if (type.equals("int")) {
									value = Integer.parseInt(valueS);
								} else if (type.equals("float")) {
									value = Float.parseFloat(valueS);
								} else if (type.equals("boolean")) {
									value = parseBoolean(valueS);
								} else if (type.equals("date")) {
									value = parseDate(valueS, format);
								} else if (type.equals("iso8601Date")) {
									final DateTime date = ISODateTimeFormat.dateTimeParser().parseDateTime(valueS);
									value = date.toDate();
									// value = new DateUtils().parse(valueS);
								} else {
									log.error("Invalid type: " + type);
									throw new DatabaseException("Invalid type: " + type);
								}
							} catch (final IllegalArgumentException e) {
								log.fatal("cannot convert '" + valueS + "' to " + type, e);
								throw e;
							}
						}
						fields.put(key, value);
					}
				}

				list.add(new GenericRow(table, fields, toDelete));
			}
			return list;
		} catch (final Exception e) {
			log.error("Error obtaining list of rows from xml: " + xml);
			throw new DatabaseException(e);
		}
	}

	protected boolean parseBoolean(final String s) {
		if (TRUE_VALUES.contains(s.toLowerCase().trim())) { return true; }
		if (FALSE_VALUES.contains(s.toLowerCase().trim())) { return false; }

		return BooleanUtils.toBoolean(s);
	}

	public void setManaged(final String dbName, final boolean managed) throws DatabaseException {
		verifyParameters(dbName);
		final JdbcTemplate jdbcTemplate = getJdbcTemplate(dbName);
		if (managed) {
			jdbcTemplate.update("COMMENT ON DATABASE " + dbName + " IS 'isManaged'");
		} else {
			jdbcTemplate.update("COMMENT ON DATABASE " + dbName + " IS NULL");
		}
	}

	// public for testing
	public Date parseDate(final String date, String format) {
		if (format == null || format.isEmpty()) {
			format = SQL_DATE_FORMAT;
		}
		try {
			final java.util.Date parsed = new SimpleDateFormat(format).parse(date);
			final String ret = new SimpleDateFormat(SQL_DATE_FORMAT).format(parsed);
			return Date.valueOf(ret);
		} catch (final ParseException e) {
			return null;
		}
	}

	private JdbcTemplate getJdbcTemplate(final String dbName) {
		final JdbcTemplate jdbcTemplate = jdbcTemplateFactory.createJdbcTemplate(dbName);
		jdbcTemplate.setFetchSize(getFetchSize());
		return jdbcTemplate;
	}

	@Required
	public void setVelocityEngine(final VelocityEngine velocityEngine) {
		this.velocityEngine = velocityEngine;
	}

	public String getDbPrefix() {
		return dbPrefix;
	}

	@Required
	public void setDbPrefix(final String dbPrefix) {
		this.dbPrefix = dbPrefix;
	}

	public DataSourceFactory getDataSourceFactory() {
		return dataSourceFactory;
	}

	@Required
	public void setDataSourceFactory(final DataSourceFactory dataSourceFactory) {
		this.dataSourceFactory = dataSourceFactory;
	}

	public JdbcTemplateFactory getJdbcTemplateFactory() {
		return jdbcTemplateFactory;
	}

	@Required
	public void setJdbcTemplateFactory(final JdbcTemplateFactory jdbcTemplateFactory) {
		this.jdbcTemplateFactory = jdbcTemplateFactory;
	}

	public TransactionTemplateFactory getTransactionTemplateFactory() {
		return transactionTemplateFactory;
	}

	@Required
	public void setTransactionTemplateFactory(final TransactionTemplateFactory transactionTemplateFactory) {
		this.transactionTemplateFactory = transactionTemplateFactory;
	}

	public int getNumbersOfRecordsForTransaction() {
		return numbersOfRecordsForTransaction;
	}

	@Required
	public void setNumbersOfRecordsForTransaction(final int numbersOfRecordsForTransaction) {
		this.numbersOfRecordsForTransaction = numbersOfRecordsForTransaction;
	}

	public String getDefaultDB() {
		return defaultDB;
	}

	@Required
	public void setDefaultDB(final String defaultDB) {
		this.defaultDB = defaultDB;
	}

	public int getFetchSize() {
		return fetchSize;
	}

	public void setFetchSize(final int fetchSize) {
		this.fetchSize = fetchSize;
	}

	public class TableDates {

		private java.sql.Date lastInsert;
		private java.sql.Date lastUpdate;
		private java.sql.Date lastDelete;

		public java.sql.Date getLastInsert() {
			return lastInsert;
		}

		public void setLastInsert(final Date lastInsert) {
			this.lastInsert = lastInsert;
		}

		public Date getLastUpdate() {
			return lastUpdate;
		}

		public void setLastUpdate(final Date lastUpdate) {
			this.lastUpdate = lastUpdate;
		}

		public Date getLastDelete() {
			return lastDelete;
		}

		public void setLastDelete(final Date lastDelete) {
			this.lastDelete = lastDelete;
		}
	}

}