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package com.dahuatech.hutool.core.map;

import com.dahuatech.hutool.core.convert.Convert;
import com.dahuatech.hutool.core.getter.OptNullBasicTypeFromObjectGetter;
import com.dahuatech.hutool.core.util.ArrayUtil;
import com.dahuatech.hutool.core.util.BooleanUtil;
import com.dahuatech.hutool.core.util.ClassLoaderUtil;
import com.dahuatech.hutool.core.util.StrUtil;

import java.io.Serializable;
import java.lang.reflect.InvocationHandler;
import java.lang.reflect.Method;
import java.lang.reflect.Proxy;
import java.util.Collection;
import java.util.Map;
import java.util.Set;

/**
 * Map代理，提供各种getXXX方法，并提供默认值支持
 *
 * @author looly
 * @since 3.2.0
 */
public class MapProxy extends OptNullBasicTypeFromObjectGetter
    implements Map, InvocationHandler, Serializable {
  private static final long serialVersionUID = 1L;

  @SuppressWarnings("rawtypes")
  Map map;

  /**
   * 构造
   *
   * @param map 被代理的Map
   */
  public MapProxy(Map map) {
    this.map = map;
  }

  /**
   * 创建代理Map

   * 此类对Map做一次包装，提供各种getXXX方法
   *
   * @param map 被代理的Map
   * @return {@link MapProxy}
   */
  public static MapProxy create(Map map) {
    return (map instanceof MapProxy) ? (MapProxy) map : new MapProxy(map);
  }

  @Override
  public Object getObj(Object key, Object defaultValue) {
    final Object value = map.get(key);
    return null != value ? value : defaultValue;
  }

  @Override
  public int size() {
    return map.size();
  }

  @Override
  public boolean isEmpty() {
    return map.isEmpty();
  }

  @Override
  public boolean containsKey(Object key) {
    return map.containsKey(key);
  }

  @Override
  public boolean containsValue(Object value) {
    return map.containsValue(value);
  }

  @Override
  public Object get(Object key) {
    return map.get(key);
  }

  @SuppressWarnings("unchecked")
  @Override
  public Object put(Object key, Object value) {
    return map.put(key, value);
  }

  @Override
  public Object remove(Object key) {
    return map.remove(key);
  }

  @SuppressWarnings("unchecked")
  @Override
  public void putAll(Map m) {
    map.putAll(m);
  }

  @Override
  public void clear() {
    map.clear();
  }

  @SuppressWarnings("unchecked")
  @Override
  public Set keySet() {
    return map.keySet();
  }

  @SuppressWarnings("unchecked")
  @Override
  public Collection values() {
    return map.values();
  }

  @SuppressWarnings("unchecked")
  @Override
  public Set> entrySet() {
    return map.entrySet();
  }

  @Override
  public Object invoke(Object proxy, Method method, Object[] args) {
    final Class[] parameterTypes = method.getParameterTypes();
    if (ArrayUtil.isEmpty(parameterTypes)) {
      final Class returnType = method.getReturnType();
      if (null != returnType && void.class != returnType) {
        // 匹配Getter
        final String methodName = method.getName();
        String fieldName = null;
        if (methodName.startsWith("get")) {
          // 匹配getXXX
          fieldName = StrUtil.removePreAndLowerFirst(methodName, 3);
        } else if (BooleanUtil.isBoolean(returnType) && methodName.startsWith("is")) {
          // 匹配isXXX
          fieldName = StrUtil.removePreAndLowerFirst(methodName, 2);
        } else if ("hashCode".equals(methodName)) {
          return this.hashCode();
        } else if ("toString".equals(methodName)) {
          return this.toString();
        }

        if (StrUtil.isNotBlank(fieldName)) {
          if (false == this.containsKey(fieldName)) {
            // 驼峰不存在转下划线尝试
            fieldName = StrUtil.toUnderlineCase(fieldName);
          }
          return Convert.convert(method.getGenericReturnType(), this.get(fieldName));
        }
      }

    } else if (1 == parameterTypes.length) {
      // 匹配Setter
      final String methodName = method.getName();
      if (methodName.startsWith("set")) {
        final String fieldName = StrUtil.removePreAndLowerFirst(methodName, 3);
        if (StrUtil.isNotBlank(fieldName)) {
          this.put(fieldName, args[0]);
        }
      } else if ("equals".equals(methodName)) {
        return this.equals(args[0]);
      }
    }

    throw new UnsupportedOperationException(method.toGenericString());
  }

  /**
   * 将Map代理为指定接口的动态代理对象
   *
   * @param  代理的Bean类型
   * @param interfaceClass 接口
   * @return 代理对象
   * @since 4.5.2
   */
  @SuppressWarnings("unchecked")
  public  T toProxyBean(Class interfaceClass) {
    return (T)
        Proxy.newProxyInstance(
            ClassLoaderUtil.getClassLoader(), new Class[] {interfaceClass}, this);
  }
}
    

    

    
            
    
            







    
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