package org.yeshi.utils.mongo;

import org.springframework.data.annotation.Transient;
import org.springframework.data.mongodb.core.query.Update;
import org.yeshi.utils.entity.wx.WXAPPInfo;

import java.lang.annotation.Annotation;
import java.lang.reflect.Field;
import java.util.ArrayList;
import java.util.List;

public class MongoDaoUtil {

    /**
     * 获取有效的属性
     *
     * @param clz
     * @return
     */
    private static List<Field> getValidField(Class<?> clz) {
        List<Field> list = new ArrayList<>();
        Field[] fields = clz.getDeclaredFields();
        for (Field fd : fields) {
            Annotation[] as = fd.getAnnotations();
            boolean create = true;
            for (Annotation a : as) {
                if (a instanceof Transient || a instanceof java.beans.Transient) {
                    create = false;
                    break;
                }
            }
            if (create) {
                list.add(fd);
            }
        }
        return list;
    }

    public static String createUpdateSelective(Class<?> clz) {

        List<Field> fields = getValidField(clz);
        StringBuilder builder = new StringBuilder();

        builder.append(String.format("void updateSelective(%s bean){\r\n", clz.getSimpleName()));

        builder.append("    Update update=new Update();\r\n");
        for (Field f : fields) {
            String getMethod = String.format("bean.get%s()", f.getName().substring(0, 1).toUpperCase() + f.getName().substring(1));
            builder.append(String.format("  if(%s!=null){\r\n", getMethod));
            builder.append(String.format("      update.set(\"%s\",%s)\r\n", f.getName(), getMethod));
            builder.append("    }\r\n");
        }

        builder.append("}");

        System.out.println(builder.toString());
        return builder.toString();
    }


    public static void main(String[] args) {
        MongoDaoUtil.createUpdateSelective(WXAPPInfo.class);
    }

}