package com.utils;

import org.apache.commons.beanutils.BeanUtils;

import java.beans.BeanInfo;
import java.beans.Introspector;
import java.beans.PropertyDescriptor;
import java.lang.reflect.Method;
import java.math.BigDecimal;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

/**
 * Map工具类
 *
 */
public class MapUtil {
    /**
     * 从map集合中获取属性值
     *
     * @param <E>
     * @param map
     *            map集合
     * @param key
     *            键对
     * @param defaultValue
     *            默认值
     * @return
     */
    public final static <E> E get(Map map, Object key, E defaultValue) {
        Object o = map.get(key);
        if (o == null)
            return defaultValue;
        return (E) o;
    }

    /**
     * * Map集合对象转化成 JavaBean集合对象
     *
     * @param javaBean
     *            JavaBean实例对象
     * @param mapList
     *            Map数据集对象
     * @return
     */
    public static <T> List<T> map2Bean(T javaBean, List<Map<String, Object>> mapList) {
        if (mapList == null || mapList.isEmpty()) {
            return null;
        }
        List<T> objectList = new ArrayList<T>();
        T object = null;
        for (Map map : mapList) {
            if (map != null) {
                object = map2Bean(javaBean, map);
                objectList.add(object);
            }
        }
        return objectList;
    }

    /**
     * * Map对象转化成 JavaBean对象
     *
     * @param javaBean
     *            JavaBean实例对象
     * @param map
     *            Map对象 * @return
     */
    public static <T> T map2Bean(T javaBean, Map map) {
        try {
            // 获取javaBean属性
            BeanInfo beanInfo = Introspector.getBeanInfo(javaBean.getClass());
            // 创建 JavaBean 对象
            Object obj = javaBean.getClass().newInstance();
            PropertyDescriptor[] propertyDescriptors = beanInfo.getPropertyDescriptors();
            if (propertyDescriptors != null && propertyDescriptors.length > 0) {
                String propertyName = null; // javaBean属性名
                Object propertyValue = null; // javaBean属性值
                Object propertyValueWrapper = null;
                for (PropertyDescriptor pd : propertyDescriptors) {
                    propertyName = pd.getName();
                    propertyName = propertyName.toUpperCase();
                    if (map.containsKey(propertyName)) {
                        propertyValue = map.get(propertyName);
                        Class<?> clazz = pd.getWriteMethod().getParameterTypes()[0];
                        if (Integer.class == clazz) {
                            if (propertyValue == null) {
                                propertyValueWrapper = null;
                            } else {
                                if (BigDecimal.class.equals(propertyValue.getClass())) {
                                    propertyValueWrapper = new Integer(((BigDecimal) propertyValue).intValue());
                                } else {
                                    propertyValueWrapper = new Integer(Integer.parseInt(propertyValue.toString()));
                                }
                            }
                        } else if (String.class == clazz) {
                            propertyValueWrapper = (propertyValue == null) ? null : propertyValue.toString();
                        } else if (BigDecimal.class == clazz) {
                            if (propertyValue == null) {
                                propertyValueWrapper = null;
                            } else {
                                if (BigDecimal.class.equals(propertyValue.getClass())) {
                                    propertyValueWrapper = propertyValue;
                                } else {
                                    propertyValueWrapper = new BigDecimal(propertyValue.toString());
                                }
                            }
                        } else {
                            propertyValueWrapper = propertyValue;
                        }
                        pd.getWriteMethod().invoke(obj, new Object[] { propertyValueWrapper });
                    }
                }
                return (T) obj;
            }
        } catch (Exception e) {
            throw new RuntimeException(e);
        }
        return null;
    }

    /**
     * JavaBean对象转化成Map对象
     *
     * @param javaBean
     * @return
     **/
    public static Map<String, Object> bean2Map(Object javaBean) {
        Map<String, Object> map = new HashMap<String, Object>();
        try {
            // 获取javaBean属性
            BeanInfo beanInfo = Introspector.getBeanInfo(javaBean.getClass());
            PropertyDescriptor[] propertyDescriptors = beanInfo.getPropertyDescriptors();
            if (propertyDescriptors != null && propertyDescriptors.length > 0) {
                String propertyName = null; // javaBean属性名
                Object propertyValue = null; // javaBean属性值
                for (PropertyDescriptor pd : propertyDescriptors) {
                    propertyName = pd.getName();
                    if (!propertyName.equals("class")) {
                        Method readMethod = pd.getReadMethod();
                        propertyValue = readMethod.invoke(javaBean, new Object[0]);
                        map.put(propertyName, propertyValue);
                    }
                }
            }
        } catch (Exception e) {
            throw new RuntimeException(e);
        }
        return map;
    }

    /**
     * JavaBean对象转化成Map对象
     *
     * @param javaBean
     * @param fieldList
     *            需转换的属性集合
     * @return
     **/
    public static Map<String, Object> bean2Map(Object javaBean, List<String> fieldList) {
        Map<String, Object> map = new HashMap<String, Object>();
        List<String> fields = fieldList;
        if (fields == null) {
            fields = new ArrayList<String>();
        }
        try {
            // 获取javaBean属性
            BeanInfo beanInfo = Introspector.getBeanInfo(javaBean.getClass());
            PropertyDescriptor[] propertyDescriptors = beanInfo.getPropertyDescriptors();
            if (propertyDescriptors != null && propertyDescriptors.length > 0) {
                String propertyName = null; // javaBean属性名
                Object propertyValue = null; // javaBean属性值
                for (PropertyDescriptor pd : propertyDescriptors) {
                    propertyName = pd.getName().toUpperCase();
                    if (fields.indexOf(propertyName) == -1) {
                        continue;
                    }
                    if (!propertyName.equals("class")) {
                        Method readMethod = pd.getReadMethod();
                        propertyValue = readMethod.invoke(javaBean, new Object[0]);
                        map.put(StringUtil.lineToHump(propertyName), propertyValue);
                    }
                }
            }
        } catch (Exception e) {
            throw new RuntimeException(e);
        }
        return map;
    }

    /**
     * JavaBean对象转化成Map对象集合
     *
     * @param javaBean
     * @param beanList
     * @param fieldList
     *            字段集合
     * @return
     **/
    public static <T> List<Map> bean2Map(T javaBean, List<T> beanList, List<String> fieldList) {
        List<Map> mapList = new ArrayList<Map>();
        if (beanList == null || beanList.isEmpty()) {
            return mapList;
        }
        Map map = null;
        for (T rowBean : beanList) {
            if (rowBean != null) {
                map = bean2Map(rowBean, fieldList);
                mapList.add(map);
            }
        }
        return mapList;
    }

    public static <T> List<T> convertListMap2ListBean(List<Map<String, Object>> listMap, Class T) throws Exception {
        List<T> beanList = new ArrayList<T>();
        for (int i = 0, n = listMap.size(); i < n; i++) {
            Map<String, Object> map = listMap.get(i);
            T bean = convertMap2Bean(map, T);
            beanList.add(bean);
        }
        return beanList;
    }

    public static <T> T convertMap2Bean(Map map, Class T) throws Exception {
        if (map == null || map.size() == 0) {
            return null;
        }
        BeanInfo beanInfo = Introspector.getBeanInfo(T);
        T bean = (T) T.newInstance();
        PropertyDescriptor[] propertyDescriptors = beanInfo.getPropertyDescriptors();
        for (int i = 0, n = propertyDescriptors.length; i < n; i++) {
            PropertyDescriptor descriptor = propertyDescriptors[i];
            String propertyName = descriptor.getName();
            if (map.containsKey(propertyName)) {
                Object value = map.get(propertyName);
                BeanUtils.copyProperty(bean, propertyName, value);
            }
        }
        return bean;
    }
}