/**

  * SQL-DK

  * Copyright © 2013 František Kučera (frantovo.cz)

  *

  * This program 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, or

  * (at your option) any later version.

  *

  * 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, see <http://www.gnu.org/licenses/>.

  */

 package info.globalcode.sql.dk;

 import info.globalcode.sql.dk.configuration.Configuration;

 import info.globalcode.sql.dk.configuration.ConfigurationException;

 import info.globalcode.sql.dk.configuration.ConfigurationProvider;

 import info.globalcode.sql.dk.configuration.DatabaseDefinition;

 import info.globalcode.sql.dk.configuration.FormatterDefinition;

 import info.globalcode.sql.dk.formatting.ColumnsHeader;

 import info.globalcode.sql.dk.formatting.Formatter;

 import info.globalcode.sql.dk.formatting.FormatterContext;

 import info.globalcode.sql.dk.formatting.FormatterException;

 import java.io.BufferedReader;

 import java.io.InputStreamReader;

 import java.io.PrintStream;

 import java.sql.SQLException;

 import java.util.ArrayList;

 import java.util.EnumSet;

 import java.util.List;

 import java.util.logging.Level;

 import java.util.logging.Logger;

 import javax.sql.rowset.RowSetMetaDataImpl;

 /**

  * Displays info like help, version etc.

  *

  * @author Ing. František Kučera (frantovo.cz)

  */

 public class InfoLister {

 	private static final Logger log = Logger.getLogger(InfoLister.class.getName());

 	private PrintStream out;

 	private ConfigurationProvider configurationProvider;

 	private CLIOptions options;

 	private Formatter formatter;

 	public InfoLister(PrintStream out, ConfigurationProvider configurationProvider, CLIOptions options) {

 		this.out = out;

 		this.configurationProvider = configurationProvider;

 		this.options = options;

 	}

 	public void showInfo() throws ConfigurationException, FormatterException {

 		EnumSet<InfoType> commands = options.getShowInfo();

 		for (InfoType infoType : commands) {

 			switch (infoType) {

 				// only these need formatted output

 				case CONNECTION:

 				case DATABASES:

 				case FORMATTERS:

 				case TYPES:

 					formatter = getFormatter();

 					formatter.writeStartBatch();

 					formatter.writeStartDatabase(new DatabaseDefinition());

 			}

 		}

 		for (InfoType infoType : commands) {

 			infoType.showInfo(this);

 		}

 		if (formatter != null) {

 			formatter.writeEndDatabase();

 			formatter.writeEndBatch();

 		}

 	}

 	private void listFormatters() throws ConfigurationException, FormatterException {

 		ColumnsHeader header = constructHeader(

 				new HeaderField("name", SQLType.VARCHAR),

 				new HeaderField("built_in", SQLType.BOOLEAN),

 				new HeaderField("default", SQLType.BOOLEAN),

 				new HeaderField("class_name", SQLType.VARCHAR));

 		List<Object[]> data = new ArrayList<>();

 		String defaultFormatter = configurationProvider.getConfiguration().getDefaultFormatter();

 		defaultFormatter = defaultFormatter == null ? Configuration.DEFAULT_FORMATTER : defaultFormatter;

 		for (FormatterDefinition fd : configurationProvider.getConfiguration().getBuildInFormatters()) {

 			data.add(new Object[]{fd.getName(), true, defaultFormatter.equals(fd.getName()), fd.getClassName()});

 		}

 		for (FormatterDefinition fd : configurationProvider.getConfiguration().getFormatters()) {

 			data.add(new Object[]{fd.getName(), false, defaultFormatter.equals(fd.getName()), fd.getClassName()});

 		}

 		printTable(formatter, header, data);

 	}

 	public void listTypes() throws FormatterException, ConfigurationException {

 		ColumnsHeader header = constructHeader(new HeaderField("name", SQLType.VARCHAR), new HeaderField("code", SQLType.INTEGER));

 		List<Object[]> data = new ArrayList<>();

 		for (SQLType sqlType : SQLType.values()) {

 			data.add(new Object[]{sqlType.name(), sqlType.getCode()});

 		}

 		printTable(formatter, header, data);

 	}

 	public void listDatabases() throws ConfigurationException, FormatterException {

 		ColumnsHeader header = constructHeader(

 				new HeaderField("database_name", SQLType.VARCHAR),

 				new HeaderField("user_name", SQLType.VARCHAR),

 				new HeaderField("database_url", SQLType.VARCHAR));

 		List<Object[]> data = new ArrayList<>();

 		final List<DatabaseDefinition> configuredDatabases = configurationProvider.getConfiguration().getDatabases();

 		if (configuredDatabases.isEmpty()) {

 			log.log(Level.WARNING, "No databases are configured.");

 		} else {

 			for (DatabaseDefinition dd : configuredDatabases) {

 				data.add(new Object[]{dd.getName(), dd.getUserName(), dd.getUrl()});

 			}

 		}

 		printTable(formatter, header, data);

 	}

 	public void testConnection() throws FormatterException, ConfigurationException {

 		ColumnsHeader header = constructHeader(

 				new HeaderField("database_name", SQLType.VARCHAR),

 				new HeaderField("configured", SQLType.BOOLEAN),

 				new HeaderField("connected", SQLType.BOOLEAN));

 		List<Object[]> data = new ArrayList<>();

 		for (String dbName : options.getDatabaseNameToTest()) {

 			data.add(testConnection(dbName));

 		}

 		printTable(formatter, header, data);

 	}

 	public Object[] testConnection(String dbName) {

 		log.log(Level.FINE, "Testing connection to database: {0}", dbName);

 		boolean succesfullyConnected = false;

 		boolean succesfullyConfigured = false;

 		try {

 			DatabaseDefinition dd = configurationProvider.getConfiguration().getDatabase(dbName);

 			log.log(Level.FINE, "Database definition was loaded from configuration");

 			succesfullyConfigured = true;

 			try (DatabaseConnection dc = dd.connect()) {

 				succesfullyConnected = dc.test();

 			}

 			log.log(Level.FINE, "Database connection test was successful");

 		} catch (ConfigurationException | SQLException e) {

 			log.log(Level.SEVERE, "Error during testing connection", e);

 		}

 		return new Object[]{dbName, succesfullyConfigured, succesfullyConnected};

 	}

 	public void printResource(String fileName) {

 		try (BufferedReader reader = new BufferedReader(new InputStreamReader(getClass().getClassLoader().getResourceAsStream(fileName)))) {

 			while (true) {

 				String line = reader.readLine();

 				if (line == null) {

 					break;

 				} else {

 					println(line);

 				}

 			}

 		} catch (Exception e) {

 			log.log(Level.SEVERE, "Unable to print this info. Please see our website for it: " + Constants.WEBSITE, e);

 		}

 	}

 	private void println(String line) {

 		out.println(line);

 	}

 	private void printTable(Formatter formatter, ColumnsHeader header, List<Object[]> data) throws ConfigurationException, FormatterException {

 		formatter.writeStartResultSet();

 		formatter.writeColumnsHeader(header);

 		for (Object[] row : data) {

 			formatter.writeStartRow();

 			for (Object cell : row) {

 				formatter.writeColumnValue(cell);

 			}

 			formatter.writeEndRow();

 		}

 		formatter.writeEndResultSet();

 	}

 	private Formatter getFormatter() throws ConfigurationException, FormatterException {

 		String formatterName = options.getFormatterName();

 		formatterName = formatterName == null ? Configuration.DEFAULT_FORMATTER_PREFETCHING : formatterName;

 		FormatterDefinition fd = configurationProvider.getConfiguration().getFormatter(formatterName);

 		FormatterContext context = new FormatterContext(out);

 		return fd.getInstance(context);

 	}

 	private ColumnsHeader constructHeader(HeaderField... fields) throws FormatterException {

 		try {

 			RowSetMetaDataImpl metaData = new RowSetMetaDataImpl();

 			metaData.setColumnCount(fields.length);

 			for (int i = 0; i < fields.length; i++) {

 				HeaderField hf = fields[i];

 				int sqlIndex = i + 1;

 				metaData.setColumnName(sqlIndex, hf.name);

 				metaData.setColumnLabel(sqlIndex, hf.name);

 				metaData.setColumnType(sqlIndex, hf.type.getCode());

 				metaData.setColumnTypeName(sqlIndex, hf.type.name());

 			}

 			return new ColumnsHeader(metaData);

 		} catch (SQLException e) {

 			throw new FormatterException("Error while constructing table headers", e);

 		}

 	}

 	private static class HeaderField {

 		String name;

 		SQLType type;

 		public HeaderField(String name, SQLType type) {

 			this.name = name;

 			this.type = type;

 		}

 	}

 	public enum InfoType {

 		HELP {

 			@Override

 			public void showInfo(InfoLister infoLister) {

 				infoLister.printResource(Constants.HELP_FILE);

 			}

 		},

 		VERSION {

 			@Override

 			public void showInfo(InfoLister infoLister) {

 				infoLister.printResource(Constants.VERSION_FILE);

 			}

 		},

 		LICENSE {

 			@Override

 			public void showInfo(InfoLister infoLister) {

 				infoLister.printResource(Constants.LICENSE_FILE);

 			}

 		},

 		FORMATTERS {

 			@Override

 			public void showInfo(InfoLister infoLister) throws FormatterException, ConfigurationException {

 				infoLister.listFormatters();

 			}

 		},

 		TYPES {

 			@Override

 			public void showInfo(InfoLister infoLister) throws FormatterException, ConfigurationException {

 				infoLister.listTypes();

 			}

 		},

 		DATABASES {

 			@Override

 			public void showInfo(InfoLister infoLister) throws FormatterException, ConfigurationException {

 				infoLister.listDatabases();

 			}

 		},

 		CONNECTION {

 			@Override

 			public void showInfo(InfoLister infoLister) throws FormatterException, ConfigurationException {

 				infoLister.testConnection();

 			}

 		};

 		public abstract void showInfo(InfoLister infoLister) throws ConfigurationException, FormatterException;

 	}

 }