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/*
 * Copyright 2011,2012 Metamarkets Group Inc.
 *
 * Licensed 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 com.metamx.common;

import com.google.common.base.Function;

import java.util.List;
import java.util.Map;

/**
 */
public class MapUtils
{
  public static String getString(Map in, String key)
  {
    return getString(in, key, null);
  }

  public static String getString(Map in, String key, String defaultValue)
  {
    Object retVal = in.get(key);

    if (retVal == null) {
      if (defaultValue == null) {
        throw new IAE("Key[%s] is required in map[%s]", key, in);
      }

      return defaultValue;
    }

    return retVal.toString();
  }

  public static Function, String> stringFromMapFn(final String key)
  {
    return new Function, String>()
    {
      @Override
      public String apply(Map map)
      {
        return MapUtils.getString(map, key);
      }
    };
  }

  public static  RetVal lookupStringValInMap(Map map, String key, Map lookupMap)
  {
    String lookupKey = getString(map, key);
    RetVal retVal = lookupMap.get(lookupKey);

    if (retVal == null) {
      throw new IAE("Unknown %s[%s], known values are%s", key, lookupKey, lookupMap.keySet());
    }

    return retVal;
  }

  public static int getInt(Map in, String key)
  {
    return getInt(in, key, null);
  }

  public static int getInt(Map in, String key, Integer defaultValue)
  {
    Object retVal = in.get(key);

    if (retVal == null) {
      if (defaultValue == null) {
        throw new IAE("Key[%s] is required in map[%s]", key, in);
      }

      return defaultValue;
    }

    try {
      return Integer.parseInt(retVal.toString());
    }
    catch (NumberFormatException e) {
      throw new IAE(e, "Key[%s] should be an int, was[%s]", key, retVal);
    }
  }

  public static long getLong(Map in, String key)
  {
    return getLong(in, key, null);
  }

  public static long getLong(Map in, String key, Long defaultValue)
  {
    Object retVal = in.get(key);

    if (retVal == null) {
      if (defaultValue == null) {
        throw new IAE("Key[%s] is required in map[%s]", key, in);
      }

      return defaultValue;
    }

    try {
      return Long.parseLong(retVal.toString());
    }
    catch (NumberFormatException e) {
      throw new IAE(e, "Key[%s] should be a long, was[%s]", key, retVal);
    }
  }

  public static double getDouble(Map in, String key)
  {
    return getDouble(in, key, null);
  }

  public static double getDouble(Map in, String key, Double defaultValue)
  {
    Object retVal = in.get(key);

    if (retVal == null) {
      if (defaultValue == null) {
        throw new IAE("Key[%s] is required in map[%s]", key, in);
      }

      return defaultValue;
    }

    try {
      return Double.parseDouble(retVal.toString());
    }
    catch (NumberFormatException e) {
      throw new IAE(e, "Key[%s] should be a double, was[%s]", key, retVal);
    }
  }

  public static List