package common.interceptor.empty;

import com.alibaba.fastjson.JSONObject;
import com.jfinal.aop.Interceptor;
import com.jfinal.aop.Invocation;
import com.jfinal.core.Controller;
import com.jfinal.kit.StrKit;
import common.utils.http.MyController;
import common.utils.http.MyRet;

public class EmptyInterceptor implements Interceptor {
	@Override
	public void intercept(Invocation inv) {
		EmptyInterface annotation = inv.getMethod().getAnnotation(EmptyInterface.class);
		
		if (annotation == null) {
			inv.invoke();
		} else {
			String[] keyArray = annotation.keyArray();
			Controller controller = inv.getController();
			JSONObject paramsModel = MyController.getJsonModelByRequestAndType(controller.getRequest(), JSONObject.class);
			
			if (isNotEmpty(paramsModel, keyArray)) {
				inv.invoke();
			} else {
				String errorMsgBuilder = "params must include: " +
						EmptyInterceptor.formatParams(keyArray) +
						", response 'data' is your params.";
				
				controller.renderJson(MyRet.fail(errorMsgBuilder).setData(paramsModel));
			}
		}
	}
	
	private boolean isNotEmpty(JSONObject paramsModel, String[] keyArray) {
		for (String key : keyArray) {
			if (StrKit.isBlank(paramsModel.getString(key))) {
				return false;
			}
		}
		
		return true;
	} 
	
	public static String formatParams(String[] keyArray) {
		StringBuilder builder = new StringBuilder();
		
		builder.append('[');
		for (int i = 0; i < keyArray.length; i++) {
			String key = keyArray[i];
			
			builder.append(key);
			
			if (i < keyArray.length - 1) builder.append(',');
		}
		builder.append(']');
		
		return builder.toString();
	}
}