/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *    http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */

package org.apache.ode.utils.xsd;

import org.apache.ode.utils.ISO8601DateParser;

import javax.xml.namespace.QName;

/**
 * Analyzes schema types and provides facilities to convert them
 * to java types.
 */
public class XSTypes {

  public static Object toJavaObject(QName type, String value) {
    String foundType = null;
    try {
      if (isDecimal(type)) {
        foundType = "number";
        return Long.valueOf(value);
      } else if (isFloat(type)) {
        foundType = "double";
        return Double.valueOf(value);
      } else if (isBoolean(type)) {
        foundType = "boolean";
        return Boolean.valueOf(value);
      } else if (isFloat(type)) {
        foundType = "double";
        return Double.valueOf(value);
      } else if (isDate(type)) {
        foundType = "date";
        return ISO8601DateParser.parseCal(value);
      } else if (isString(type)) {
        foundType = "string";
        return value;
      }
    } catch (Exception nfe) {
      throw new IllegalArgumentException("The type " + foundType + " has been detected using the XSD type " +
              type + " but the parsing failed! The provided value is probably not of the right type:" + nfe.toString());
    }
    throw new IllegalArgumentException("Couldn't find java type for " + type);
  }

  public static boolean isNumber(QName type) {
    try {
      DECIMAL.valueOf(type.getLocalPart().toUpperCase());
      FLOAT.valueOf(type.getLocalPart().toUpperCase());
      return true;
    } catch (IllegalArgumentException e) {
      return false;
    }
  }

  public static boolean isDate(QName type) {
    try {
      DATEBASE.valueOf(type.getLocalPart().toUpperCase());
      return true;
    } catch (IllegalArgumentException e) {
      return false;
    }
  }

  public static boolean isString(QName type) {
    try {
      STRING.valueOf(type.getLocalPart().toUpperCase());
      return true;
    } catch (IllegalArgumentException e) {
      return false;
    }
  }

  public static boolean isDecimal(QName type) {
    try {
      DECIMAL.valueOf(type.getLocalPart().toUpperCase());
      return true;
    } catch (IllegalArgumentException e) {
      return false;
    }
  }

  public static boolean isFloat(QName type) {
    try {
      FLOAT.valueOf(type.getLocalPart().toUpperCase());
      return true;
    } catch (IllegalArgumentException e) {
      return false;
    }
  }

  public static boolean isBoolean(QName type) {
    return "boolean".equals(type.getLocalPart());
  }

  enum DECIMAL {
    DECIMAL, INTEGER, NONPOSITIVEINTEGER, LONG, NONNEGATIVEINTEGER, NEGATIVEINTEGER, INT, UNSIGNEDLONG,
    POSITIVEINTEGER, SHORT, BYTE, UNSIGNEDINT, UNSIGNEDSHORT, UNSIGNEDBYTE
  }

  enum FLOAT {
    FLOAT, DOUBLE
  }

  enum STRING {
    STRING, NORMALIZEDSTRING, TOKEN
  }

  enum DATEBASE {
    DATETIME, DATE
  }

}