/**

 * 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 static info.globalcode.sql.dk.Functions.readString;

import info.globalcode.sql.dk.InfoLister.InfoType;

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

import java.io.IOException;

import java.io.InputStream;

import java.util.ArrayList;

import java.util.HashMap;

import java.util.List;

import java.util.Map;

/**

 * Converts command line arguments from String array to object. Checks basic constraints (if only

 * supported options are used and if they have correct number of parameters)

 *

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

 */

public class CLIParser {

	public static final String TYPE_NAME_SEPARATOR = ":";

	public CLIOptions parseOptions(String[] args, InputStream in) throws CLIParserException {

		CLIOptions options = new CLIOptions();

		List<SQLType> numberedTypes = new ArrayList<>();

		Map<String, SQLType> namedTypes = new HashMap<>();

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

			String arg = args[i];

			switch (arg) {

				case Tokens.TYPES:

					String typesString = fetchNext(args, ++i);

					for (String oneType : typesString.split(",")) {

						int sepatratorIndex = oneType.indexOf(TYPE_NAME_SEPARATOR);

						if (sepatratorIndex == -1) {

							numberedTypes.add(getType(oneType.toUpperCase()));

						} else {

							String namePart = oneType.substring(0, sepatratorIndex).trim();

							String typePart = oneType.substring(sepatratorIndex + TYPE_NAME_SEPARATOR.length(), oneType.length());

							namedTypes.put(namePart, getType(typePart.toUpperCase()));

						}

					}

					break;

				case Tokens.NAME_PREFIX:

					options.setNamePrefix(fetchNext(args, ++i));

					break;

				case Tokens.NAME_SUFFIX:

					options.setNameSuffix(fetchNext(args, ++i));

					break;

				case Tokens.DB:

					options.setDatabaseName(fetchNext(args, ++i));

					break;

				case Tokens.SQL:

					options.setSql(fetchNext(args, ++i));

					break;

				case Tokens.SQL_IN:

					try {

						options.setSql(readString(in));

					} catch (IOException e) {

						throw new CLIParserException("Unable to read SQL from the input stream", e);

					}

					break;

				case Tokens.BATCH:

					options.setBatch(true);

					break;

				case Tokens.DATA: // --data is the last option

					for (i++; i < args.length; i++) {

						arg = args[i];

						Parameter parameter;

						if (numberedTypes.isEmpty()) {

							parameter = new Parameter(arg, null);

						} else {

							int paramIndex = options.getNumberedParameters().size();

							SQLType paramType;

							try {

								paramType = numberedTypes.get(paramIndex);

							} catch (IndexOutOfBoundsException e) {

								throw new CLIParserException("Missing type for parameter #" + paramIndex, e);

							} catch (NullPointerException e) {

								throw new CLIParserException("Invalid type definition for parameter #" + paramIndex, e);

							}

							parameter = new Parameter(arg, paramType);

						}

						options.addNumberedParameter(parameter);

					}

					break;

				case Tokens.DATA_NAMED:

					for (i++; i < args.length; i++) {

						String paramName = args[i];

						String paramValue = fetchNext(args, ++i);

						options.addNamedParameter(new NamedParameter(paramName, paramValue, namedTypes.get(paramName)));

					}

					break;

				case Tokens.RELATION:

					options.addRelationName(fetchNext(args, ++i));

					break;

				case Tokens.FORMATTER:

					options.setFormatterName(fetchNext(args, ++i));

					break;

				case Tokens.DB_PROPERTY:

					options.addDatabaseProperty(new Property(fetchNext(args, ++i), fetchNext(args, ++i)));

					break;

				case Tokens.FORMATTER_PROPERTY:

					options.addFormatterProperty(new Property(fetchNext(args, ++i), fetchNext(args, ++i)));

					break;

				case Tokens.INFO_HELP:

					options.addShowInfo(InfoType.HELP);

					break;

				case Tokens.INFO_FORMATTERS:

					options.addShowInfo(InfoType.FORMATTERS);

					break;

				case Tokens.INFO_FORMATTER_PROPERTIES:

					options.addShowInfo(InfoType.FORMATTER_PROPERTIES);

					options.addFormatterNameToListProperties(fetchNext(args, ++i));

					break;

				case Tokens.INFO_LICENSE:

					options.addShowInfo(InfoType.LICENSE);

					break;

				case Tokens.INFO_JAVA_PROPERTIES:

					options.addShowInfo(InfoType.JAVA_PROPERTIES);

					break;

				case Tokens.INFO_ENVIRONMENT_VARIABLES:

					options.addShowInfo(InfoType.ENVIRONMENT_VARIABLES);

					break;

				case Tokens.INFO_TYPES:

					options.addShowInfo(InfoType.TYPES);

					break;

				case Tokens.INFO_VERSION:

					options.addShowInfo(InfoType.VERSION);

					break;

				case Tokens.INFO_JDBC_DRIVERS:

					options.addShowInfo(InfoType.JDBC_DRIVERS);

					break;

				case Tokens.INFO_JDBC_PROPERTIES:

					options.addShowInfo(InfoType.JDBC_PROPERTIES);

					options.addDatabaseNameToListProperties(fetchNext(args, ++i));

					break;

				case Tokens.INFO_DATABASES:

					options.addShowInfo(InfoType.DATABASES);

					break;

				case Tokens.INFO_CONNECTION:

					options.addShowInfo(InfoType.CONNECTION);

					options.addDatabaseNameToTest(fetchNext(args, ++i));

					break;

				default:

					throw new CLIParserException("Unknown option: " + arg);

			}

		}

		return options;

	}

	private String fetchNext(String[] args, int index) throws CLIParserException {

		if (index < args.length) {

			return args[index];

		} else {

			throw new CLIParserException("Expecting value for option: " + args[index - 1]);

		}

	}

	public static class Tokens {

		// bash-completion:options:

		public static final String DB = "--db"; // bash-completion:option // help: database name

		public static final String DB_PROPERTY = "--db-property"; // bash-completion:option // help: name and value

		public static final String SQL = "--sql"; // bash-completion:option // help: SQL query/command

		public static final String SQL_IN = "--sql-in"; // bash-completion:option // help: SQL query/command

		public static final String BATCH = "--batch"; // bash-completion:option // help: batch mode (no argument)

		public static final String DATA = "--data"; // bash-completion:option // help: list of ordinal parameters

		public static final String DATA_NAMED = "--data-named"; // bash-completion:option // help: list of named parameters

		public static final String NAME_PREFIX = "--name-prefix"; // bash-completion:option // help: parameter name prefix – regular expression

		public static final String NAME_SUFFIX = "--name-suffix"; // bash-completion:option // help: parameter name suffix – regular expression

		public static final String TYPES = "--types"; // bash-completion:option // help: comma separated list of parameter types

		public static final String RELATION = "--relation"; // bash-completion:option // help: name of the output relation (result set)

		public static final String FORMATTER = "--formatter"; // bash-completion:option // help: name of the output formatter

		public static final String FORMATTER_PROPERTY = "--formatter-property"; // bash-completion:option // help: name and value

		public static final String INFO_HELP = "--help"; // bash-completion:option // help: print this help

		public static final String INFO_VERSION = "--version"; // bash-completion:option // help: print version info

		public static final String INFO_LICENSE = "--license"; // bash-completion:option // help: print license

		public static final String INFO_JAVA_PROPERTIES = "--list-java-properties"; // bash-completion:option // help: list of Java system properties

		public static final String INFO_ENVIRONMENT_VARIABLES = "--list-environment-variables"; // bash-completion:option // help: list of environment variables

		public static final String INFO_FORMATTERS = "--list-formatters"; // bash-completion:option // help: print list of available formatters

		public static final String INFO_FORMATTER_PROPERTIES = "--list-formatter-properties"; // bash-completion:option // help: print list of available properties for given formatter

		public static final String INFO_TYPES = "--list-types"; // bash-completion:option // help: print list of available data types

		public static final String INFO_JDBC_DRIVERS = "--list-jdbc-drivers"; // bash-completion:option // help: list of available JDBC drivers

		public static final String INFO_JDBC_PROPERTIES = "--list-jdbc-properties"; // bash-completion:option // help: list of available JDBC properties for given database

		public static final String INFO_DATABASES = "--list-databases"; // bash-completion:option // help: print list of configured databases

		public static final String INFO_CONNECTION = "--test-connection"; // bash-completion:option // help: test connection to particular database

		private Tokens() {

		}

	}

	private SQLType getType(String typeString) throws CLIParserException {

		try {

			return SQLType.valueOf(typeString.trim());

		} catch (IllegalArgumentException e) {

			throw new CLIParserException("Unsupported type: " + typeString, e);

		}

	}

}