package info.globalcode.sql.dk;

import java.sql.Types;
import java.util.ArrayList;
import java.util.Collections;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

/**
 *
 * @author Ing. František Kučera (frantovo.cz)
 */
public class CLIStarter {

	public static final String TYPE_NAME_SEPARATOR = ":";
	private static final Map<String, Integer> types;

	static {
		Map<String, Integer> m = new HashMap<>();
		m.put("int", Types.INTEGER);
		m.put("string", Types.VARCHAR);
		m.put("boolean", Types.BOOLEAN);
		/**
		 * TODO: more types
		 */
		types = Collections.unmodifiableMap(m);
	}

	public static void main(String[] args) {

		args = new String[]{"--sql", "SELECT * FROM tabulka;", "--db", "databáze_1", "--types", "int,bbb,omfg:int,omg:boolean", "--data", "xxx", ":omfg", "hodnota omfg", ":omg", "true"};

		CLIOptions options = parseOptions(args);
	}

	private static CLIOptions parseOptions(String[] args) {
		CLIOptions options = new CLIOptions();

		List<Integer> numberedTypes = new ArrayList<>();
		Map<String, Integer> namedTypes = new HashMap<>();

		for (int i = 0; i < args.length; i++) {
			String arg = args[i];
			switch (arg) {
				case Tokens.TYPES:
					String typesString = args[++i];

					for (String oneType : typesString.split("\\s*,\\s*")) {
						int sepatratorIndex = oneType.indexOf(TYPE_NAME_SEPARATOR);
						if (sepatratorIndex == -1) {
							numberedTypes.add(getType(oneType));
						} else {
							String namePart = oneType.substring(0, sepatratorIndex);
							String typePart = oneType.substring(sepatratorIndex + TYPE_NAME_SEPARATOR.length(), oneType.length());
							namedTypes.put(namePart, getType(typePart));
						}
					}
					break;
				case Tokens.NAME_PREFIX:
					options.setNamePrefix(args[++i]);
					break;
				case Tokens.DB:
					options.setDatabaseName(args[++i]);
					break;
				case Tokens.SQL:
					options.setSql(args[++i]);
					options.setCommandType(CLIOptions.COMMAND_TYPE.QUERY);
					break;
				case Tokens.SQL_UPDATE:
				case Tokens.SQL_INSERT:
					options.setSql(args[++i]);
					options.setCommandType(CLIOptions.COMMAND_TYPE.UPDATE);
					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];

						if (arg.startsWith(options.getNamePrefix())) {
							String paramName = arg.substring(options.getNamePrefix().length());
							String paramValue = args[++i];
							options.addNamedParameter(new NamedParameter(paramName, paramValue, namedTypes.get(paramName)));
						} else {
							int paramIndex = options.getNumberedParameters().size();
							int paramType;
							try {
								paramType = numberedTypes.get(paramIndex);
							} catch (IndexOutOfBoundsException e) {
								throw new IllegalArgumentException("Missing type for parameter #" + paramIndex, e);
							} catch (NullPointerException e) {
								throw new IllegalArgumentException("Invalid type definition for parameter #" + paramIndex, e);
							}
							options.addNumberedParameter(new Parameter(arg, paramType));
						}
					}
					break;
				default:
					throw new IllegalArgumentException("Unknown option: " + arg);
			}
		}



		return options;

	}

	public static class Tokens {

		public static final String DB = "--db";
		public static final String SQL = "--sql";
		public static final String SQL_UPDATE = "--sql-update";
		public static final String SQL_INSERT = "--sql-insert";
		public static final String BATCH = "--batch";
		public static final String DATA = "--data";
		public static final String NAME_PREFIX = "--name-prefix";
		public static final String TYPES = "--types";

		private Tokens() {
		}
	}

	private static Integer getType(String typeString) {
		return types.get(typeString);
	}
}