package com.engine.salary.util.valid;

import com.engine.salary.exception.SalaryRunTimeException;
import com.engine.salary.util.SalaryI18nUtil;
import org.apache.commons.lang3.StringUtils;

import java.beans.BeanInfo;
import java.beans.Introspector;
import java.beans.PropertyDescriptor;
import java.lang.reflect.Field;
import java.lang.reflect.Method;
import java.text.SimpleDateFormat;
import java.util.Collection;
import java.util.Date;
import java.util.List;

/**
 * 参数校验
 * <p>Copyright: Copyright (c) 2022</p>
 * <p>Company: 泛微软件</p>
 *
 * @author qiantao
 * @version 1.0
 **/
public class ValidUtil {

    /**
     * 通过反射来获取javaBean上的注解信息，判断属性值信息，然后通过注解元数据
     * 来返回
     *
     * @param t
     */
    public static <T> void doValidator(T t) {
        Class<?> clazz = t.getClass();
        Field[] fields = clazz.getDeclaredFields();
        for (Field field : fields) {
            DataCheck rule = field.getDeclaredAnnotation(DataCheck.class);
            if (null != rule) {
                //字段值
                Object value = getValue(t, field.getName());

                ValidTypeEnum type = rule.type();

                int labelId = rule.labelId();
                String message = rule.message();

                boolean require = rule.require();
                int max = rule.max();
                int min = rule.min();
                String pattern = rule.pattern();

                if (require) {
                    if (!notNull(value)) {
                        throw new SalaryRunTimeException(SalaryI18nUtil.getI18nLabel(labelId, message));
                    }
                }

                if (ValidTypeEnum.STRING == type) {
                    //区间值
                    if (value != null && max != -1) {
                        String s = String.valueOf(value);
                        if (s.length() > max) {
                            throw new SalaryRunTimeException(SalaryI18nUtil.getI18nLabel(labelId, message));
                        }
                    }

                    if (value != null && min != -1) {
                        String s = String.valueOf(value);
                        if (s.length() < min) {
                            throw new SalaryRunTimeException(SalaryI18nUtil.getI18nLabel(labelId, message));
                        }
                    }
                }

                if (ValidTypeEnum.DATE == type) {
                    if (value != null && StringUtils.isNotBlank(value.toString()) && isValidDate(value.toString(), pattern)) {
                        throw new SalaryRunTimeException(SalaryI18nUtil.getI18nLabel(labelId, message));
                    }
                }


                if (ValidTypeEnum.NUMBER == type) {
                    if (value instanceof Integer) {
                        int v = (Integer) value;
                        if (max != -1) {
                            if (v > max) {
                                throw new SalaryRunTimeException(SalaryI18nUtil.getI18nLabel(labelId, message));
                            }
                        }
                        if (min != -1) {
                            if (v < min) {
                                throw new SalaryRunTimeException(SalaryI18nUtil.getI18nLabel(labelId, message));
                            }
                        }
                    }

                }


            }
        }
    }

    private static <T> Object getValue(T t, String fieldName) {
        Object value = null;
        try {
            BeanInfo beanInfo = Introspector.getBeanInfo(t.getClass());
            PropertyDescriptor[] props = beanInfo.getPropertyDescriptors();
            for (PropertyDescriptor property : props) {
                if (fieldName.equals(property.getName())) {
                    Method method = property.getReadMethod();
                    value = method.invoke(t, new Object[]{});
                }
            }
        } catch (Exception e) {
            e.printStackTrace();
        }
        return value;
    }

    private static boolean notNull(Object value) {
        if (null == value) {
            return false;
        }
        if (value instanceof String && isEmpty((String) value)) {
            return false;
        }
        if (value instanceof List && isEmpty((Collection<?>) value)) {
            return false;
        }
        return true;
    }

    private static boolean isEmpty(String str) {
        return null == str || str.isEmpty();
    }

    private static boolean isEmpty(Collection<?> list) {
        return null == list || list.isEmpty();
    }


    /**
     * 校验日期
     */
    private static boolean isValidDate(String str, String pattern) {
        boolean convertSuccess = true;
        if (str != null && str.length() == pattern.length()) {
            // 指定日期格式为四位年/两位月份/两位日期，注意yyyy/MM/dd区分大小写；
            SimpleDateFormat format = new SimpleDateFormat(pattern);
            try {
                // 设置lenient为false.
                // 否则SimpleDateFormat会比较宽松地验证日期，比如2007/02/29会被接受，并转换成2007/03/01
                format.setLenient(false);
                Date dateStr = format.parse(str);
            } catch (Exception e) {
                // 如果throw java.text.ParseException或者NullPointerException，就说明格式不对
                convertSuccess = false;
            }
        } else {
            convertSuccess = false;
        }
        return convertSuccess;
    }

}