package org.yeshi.utils.generater.mongo;

import org.springframework.data.annotation.Transient;
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("public void updateSelective(%s bean) {\r\n", clz.getSimpleName()));

        builder.append("    Query query = new Query();\r\n");
        builder.append("    query.addCriteria(Criteria.where(\"id\").is(bean.getId()));\r\n");

        builder.append("    Update update = new Update();\r\n");
        for (Field f : fields) {
            if ("id".equalsIgnoreCase(f.getName()) || "createTime".equalsIgnoreCase(f.getName()))
                continue;

            if (f.getModifiers() == 25) {//public final static修饰
                continue;
            }
            String getMethod = String.format("bean.get%s()", f.getName().substring(0, 1).toUpperCase() + f.getName().substring(1));
            if (f.getName().equalsIgnoreCase("updateTime")) {
                builder.append(String.format("    update.set(\"%s\", %s);\r\n", f.getName(), "new Date()"));
            } else {
                builder.append(String.format("    if (%s != null) {\r\n", getMethod));
                builder.append(String.format("        update.set(\"%s\", %s);\r\n", f.getName(), f.getName().equalsIgnoreCase("updateTime") ? "new Date()" : getMethod));
                builder.append("    }\r\n");
            }
        }

        builder.append("    update(query, update);\r\n");
        builder.append("}");
        return builder.toString();
    }


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

}