package foundation.dao;

import foundation.data.entity.Entity;
import foundation.data.loader.DataPackageMetaLoader;
import foundation.data.object.DataObject;
import foundation.data.object.DataObjectContainer;
import foundation.server.Container;
import foundation.util.Util;

public class DataPackageMetaContainer extends Container<DataPackageMeta> {
	
    private static DataPackageMetaContainer instance;
	
	
	private DataPackageMetaContainer() {
		
	}
	
	public synchronized static DataPackageMetaContainer getInstance() {
		if (instance == null) {
			instance = new DataPackageMetaContainer();
		}
		
		return instance;
	}

	@Override
	public DataPackageMeta get(String name) {
		DataPackageMeta result = super.get(name);
		
		if (result == null) {
			DataObject dataObject = DataObject.getInstance(name);
			
			if (dataObject == null) {
				return null;
			}
			
			//如果有dataObject，但是没有定义DataPackage，那么创建默认的DataPackageMeta
			try {
				synchronized (this) {
					result = new DataPackageMeta(dataObject); 
			        add(name, result);
				}
			}
			catch (Exception e) {
				e.printStackTrace();
			}
		}
		
		return result;
	}

	public synchronized DataPackageMeta refresh(String dataName) throws Exception {
		//1. 加载新的 data package 定义
		DataPackageMeta result = DataPackageMetaLoader.loadOneDataPackage(dataName);
		
		//2. 将新的  data package 放到 container中
		add(result.getName(), result);
		
		//3. 返回结果
		return result;
	}

	public void createByName(String name) throws Exception {
        if (Util.isEmpty(name)) {
            return;
        }
        DataObject packageDataObject = DataObject.getInstance("sys_data_package");
        Entity packageEntity = packageDataObject.createTableEntity(true);
        String packageId = DataPackageMeta.PreFix + name;
        packageEntity.set("id", packageId);
        packageEntity.set("name", name);
        packageEntity.set("remark", name);

        DataObject packageDetailDataObject = DataObject.getInstance("sys_data_package_detail");
        Entity packageDetailEntity = packageDetailDataObject.createTableEmptyEntity();
        packageDetailEntity.set("id", name);
        packageDetailEntity.set("parent_id", packageId);
        packageDetailEntity.set("name", name);
        packageDetailEntity.set("data_object", name);
        packageDetailEntity.set("type_code", "Master");

        packageDataObject.saveEntity(packageEntity);
        packageDetailDataObject.saveEntity(packageDetailEntity);

        DataObjectContainer.getInstance().createOne(name);

        //2
        DataPackageMeta packageMeta = new DataPackageMeta();
        packageMeta.load(packageEntity);
        PackageItemMeta itemMeta = new PackageItemMeta();
        itemMeta.load(packageDetailEntity);
        itemMeta.setDataObject();
        
        packageMeta.loadOneDetail(itemMeta);
        
        DataPackageMetaContainer.getInstance().add(packageMeta.getName(), packageMeta);
    }

}