/**
 * 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);
		}
	}
}