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package com.eworkcloud.excel.util;

import lombok.SneakyThrows;

import java.lang.reflect.Field;
import java.util.Collection;
import java.util.LinkedHashMap;
import java.util.Map;

public abstract class ClassUtils {

    private static boolean isPropertyName(String name) {
        return !(name.startsWith("$") || "serialVersionUID".equals(name) || "class".equals(name));
    }

    /**
     * 实例化对象类
     *
     * @param clazz 类
     * @param    类型
     * @return 实例
     */
    @SneakyThrows
    public static  T newInstance(Class clazz) {
        return clazz.newInstance();
    }

    /**
     * 判断是不是集合
     *
     * @param clazz 类
     * @return 集合
     */
    public static boolean isCollection(Class clazz) {
        return Collection.class.isAssignableFrom(clazz);
    }

    /**
     * 判断是不是集合
     *
     * @param field 字段
     * @return 集合
     */
    public static boolean isCollection(Field field) {
        return isCollection(field.getType());
    }

    /**
     * 获取class的字段（包括父类）
     *
     * @param clazz 类
     * @return 字段数组
     */
    public static Field[] getFields(Class clazz) {
        Map fieldMap = new LinkedHashMap<>();
        do {
            Field[] fields = clazz.getDeclaredFields();
            for (Field field : fields) {
                String name = field.getName();
                if (isPropertyName(name) && !fieldMap.containsKey(name)) {
                    try {
                        field.setAccessible(true);
                        fieldMap.put(field.getName(), field);
                    } catch (SecurityException ignored) {
                    }
                }
            }
            clazz = clazz.getSuperclass();
        } while (clazz != Object.class && clazz != null);

        return fieldMap.values().toArray(new Field[0]);
    }

    /**
     * 获取字段的值
     *
     * @param field 字段
     * @param obj   对象
     * @return 值
     */
    @SneakyThrows
    public static Object getValue(Field field, Object obj) {
        return field.get(obj);
    }

    /**
     * 设置字段的值
     *
     * @param field 字段
     * @param obj   对象
     * @param value 值
     */
    @SneakyThrows
    public static void setValue(Field field, Object obj, Object value) {
        field.setAccessible(true);
        field.set(obj, value);
    }
}