/*
 * The MIT License
 * Copyright (c) 2012 Microsoft Corporation
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 * THE SOFTWARE.
 */

package microsoft.exchange.webservices.data.misc;

import microsoft.exchange.webservices.data.core.EwsUtilities;
import microsoft.exchange.webservices.data.core.ILazyMember;
import microsoft.exchange.webservices.data.core.LazyMember;
import microsoft.exchange.webservices.data.core.exception.misc.ArgumentException;
import microsoft.exchange.webservices.data.core.exception.misc.ArgumentNullException;
import microsoft.exchange.webservices.data.core.exception.misc.FormatException;
import microsoft.exchange.webservices.data.core.exception.service.local.ServiceXmlDeserializationException;
import org.apache.commons.lang3.StringUtils;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;

import java.text.DateFormat;
import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.ArrayList;
import java.util.Date;
import java.util.HashMap;
import java.util.Map;
import java.util.UUID;

/**
 * Represents an entry in the MapiTypeConverter map.
 */
public class MapiTypeConverterMapEntry {

  private static final Log LOG = LogFactory.getLog(MapiTypeConverterMapEntry.class);

  /**
   * Map CLR types used for MAPI property to matching default values.
   */
  private static LazyMember<Map<Class<?>, Object>> defaultValueMap = new LazyMember<Map<Class<?>, Object>>(
      new ILazyMember<Map<Class<?>, Object>>() {
        public Map<Class<?>, Object> createInstance() {

          Map<Class<?>, Object> map = new HashMap<Class<?>, Object>();

          map.put(Boolean.class, false);
          map.put(Byte[].class, null);
          map.put(Short.class, new Short((short) 0));
          map.put(Integer.class, 0);
          map.put(Long.class, new Long(0L));
          map.put(Float.class, new Float(0.0));
          map.put(Double.class, new Double(0.0D));
          SimpleDateFormat formatter = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
          try {
            map.put(Date.class, formatter.parse("0001-01-01 12:00:00"));
          } catch (ParseException e) {
            LOG.error(e);
          }
          map.put(UUID.class, UUID.fromString("00000000-0000-0000-0000-000000000000"));
          map.put(String.class, null);

          return map;

        }
      });
  /**
   * The is array.
   */
  boolean isArray;

  /**
   * The type.
   */
  Class<?> type;

  /**
   * The convert to string.
   */
  IFunction<Object, String> convertToString;

  /**
   * The parse.
   */
  IFunction<String, Object> parse;

  /**
   * Initializes a new instance of the MapiTypeConverterMapEntry class.
   *
   * @param type The type. y default, converting a type to string is done by
   *             calling value.ToString. Instances can override this behavior.
   *             <p/>
   *             By default, converting a string to the appropriate value type
   *             is done by calling Convert.ChangeType Instances may override
   *             this behavior.
   */
  public MapiTypeConverterMapEntry(Class<?> type) {
    EwsUtilities.ewsAssert(defaultValueMap.getMember().containsKey(type), "MapiTypeConverterMapEntry ctor",
                           "No default value entry for type " + type.getName());

    this.type = type;
    this.convertToString = IFunctions.ToString.INSTANCE;
    this.parse = IFunctions.StringToObject.INSTANCE;
  }

  /**
   * Change value to a value of compatible type.
   * <p/>
   * The type of a simple value should match exactly or be convertible to the
   * appropriate type. An array value has to be a single dimension (rank),
   * contain at least one value and contain elements that exactly match the
   * expected type. (We could relax this last requirement so that, for
   * example, you could pass an array of Int32 that could be converted to an
   * array of Double but that seems like overkill).
   *
   * @param value The value.
   * @return New value.
   * @throws Exception the exception
   */
  public Object changeType(Object value) throws Exception {
    if (this.getIsArray()) {
      this.validateValueAsArray(value);
      return value;
    } else if (value.getClass() == this.getType()) {
      return value;
    } else {
      try {
        if (this.getType().isInstance(Integer.valueOf(0))) {
          Object o = null;
          o = Integer.parseInt(value + "");
          return o;
        } else if (this.getType().isInstance(new Date())) {
          DateFormat df = new SimpleDateFormat(
              "yyyy-MM-dd'T'HH:mm:ss'Z'");
          return df.parse(value + "");
        } else if (this.getType().isInstance(Boolean.valueOf(false))) {
          Object o = null;
          o = Boolean.parseBoolean(value + "");
          return o;
        } else if (this.getType().isInstance(String.class)) {
          return value;
        }
        return null;
      } catch (ClassCastException ex) {
        throw new ArgumentException(String.format(
            "The value '%s' of type %s can't be converted to a value of type %s.", "%s", "%s"
            , this.getType()), ex);
      }
    }
  }

  /**
   * Converts a string to value consistent with type.
   * <p/>
   * For array types, this method is called for each array element.
   *
   * @param stringValue String to convert to a value.
   * @return value
   * @throws ServiceXmlDeserializationException                  the service xml deserialization exception
   * @throws FormatException the format exception
   */
  public Object convertToValue(String stringValue)
      throws ServiceXmlDeserializationException, FormatException {
    try {
      return this.getParse().func(stringValue);
    } catch (ClassCastException ex) {
      throw new ServiceXmlDeserializationException(String
          .format("The value '%s' couldn't be converted to type %s.", stringValue, this
              .getType()), ex);
    } catch (NumberFormatException ex) {
      throw new ServiceXmlDeserializationException(String
          .format("The value '%s' couldn't be converted to type %s.", stringValue, this.getType()), ex);
    }

  }

  /**
   * Converts a string to value consistent with type (or uses the default value if the string is null or empty).
   *
   * @param stringValue to convert to a value.
   * @return Value.
   * @throws FormatException
   * @throws ServiceXmlDeserializationException
   */
  public Object convertToValueOrDefault(final String stringValue)
      throws ServiceXmlDeserializationException, FormatException {
    return (StringUtils.isEmpty(stringValue))
         ? getDefaultValue() : convertToValue(stringValue);
  }

  /**
   * Validates array value.
   *
   * @param value the value
   * @throws ArgumentException     the argument exception
   * @throws ArgumentNullException the argument exception
   */
  private void validateValueAsArray(Object value) throws ArgumentException, ArgumentNullException {
    if (value == null) {
      throw new ArgumentNullException("value");
    }

    if (value instanceof ArrayList) {
      ArrayList<?> arrayList = (ArrayList<?>) value;
      if (arrayList.isEmpty()) {
        throw new ArgumentException("The Array value must have at least one element.");
      }

      if (arrayList.get(0).getClass() != this.getType()) {
        throw new ArgumentException(String.format("Type %s can't be used as an array of type %s.", value.getClass(),
            this.getType()));
      }
    }
  }

  /**
   * Gets the dim. If `array' is an array object returns its dimensions;
   * otherwise returns 0
   *
   * @param array the array
   * @return the dim
   */
  public static int getDim(Object array) {
    int dim = 0;
    Class<?> cls = array.getClass();
    while (cls.isArray()) {
      dim++;
      cls = cls.getComponentType();
    }
    return dim;
  }

  /**
   * Gets  the type.
   *
   * @return the type
   */

  public Class<?> getType() {
    return this.type;
  }

  /**
   * Sets the type.
   *
   * @param cls the new type
   */
  public void setType(Class<?> cls) {
    type = cls;
  }

  /**
   * Gets  a value indicating whether this instance is array.
   *
   * @return the checks if is array
   */
  public boolean getIsArray() {
    return isArray;

  }

  /**
   * Sets the checks if is array.
   *
   * @param value the new checks if is array
   */
  protected void setIsArray(boolean value) {
    isArray = value;
  }

  /**
   * Gets the string to object converter. For array types, this method is
   * called for each array element.
   *
   * @return the convert to string
   */
  protected IFunction<Object, String> getConvertToString() {
    return convertToString;
  }

  /**
   * Sets the string to object converter.
   *
   * @param value the value
   */
  protected void setConvertToString(IFunction<Object, String> value) {
    convertToString = value;
  }

  /**
   * Gets the string parser. For array types, this method is called for each
   * array element.
   *
   * @return the parses the
   */
  protected IFunction<String, Object> getParse() {
    return parse;
  }

  /**
   * Sets the string parser.
   *
   * @param value the value
   */
  protected void setParse(IFunction<String, Object> value) {
    parse = value;
  }

  /**
   * Gets the default value for the type.
   *
   * @return Type
   */
  protected Object getDefaultValue() {
    return defaultValueMap.getMember().get(this.type);
  }
}