package foundation.state;

import foundation.dao.DataPackage;
import foundation.data.entity.Entity;
import foundation.variant.expression.VariantExpression;
import foundation.variant.expression.VariantList;
import foundation.variant.expression.VariantSegment;

public class StateMessage {
	
	private String dataName;
	private String errorCode;
	private String template;
	private VariantExpression expression;
	
	public StateMessage() {
		
	}
	
	public StateMessage(String defaultValue) {
		this.template = defaultValue;
	}
	
	public static StateMessage getInstance(String targetId, String errorCode, String defaultValue) {
		String key = StateMessage.createKey(targetId, errorCode);
		
		StateMessageBucket bucket = StateMessageBucket.getInstance();
		StateMessage result = bucket.get(key);
		
		if (result == null) {
			result = new StateMessage(defaultValue);
		}
		
		return result;
	}

	public void load(Entity entity) throws Exception {
		dataName = entity.getString("data_name");
		errorCode = entity.getString("error_code");
		template = entity.getString("error_message");
		
		expression = new VariantExpression(template);
	}
	
	public String getContent(DataPackage... datas) {
		if (datas.length == 0) {
			return template;
		}
		
		//@{package.item.field}
		if(expression == null) {
			return template;
		}
		
		VariantList variants = expression.getVariantList();
		
		for (DataPackage data: datas) {
			String dataName = data.getName() + ".";
			dataName = dataName.toLowerCase();
			
			for (VariantSegment variant: variants) {
				String name = variant.getName();
				name = name.toLowerCase();
				
				if (!name.startsWith(dataName)) {
					continue;
				}
				
				String segment = name.substring(dataName.length());
				String value = data.getItemValue(segment);
				variant.setValue(value);
			}
		}
		
		return expression.toString();
	}
	
	public StateMessage newInstance() {
		StateMessage result = new StateMessage(template);
		
		try {
			result.expression = this.expression.newInstance();
		} 
		catch (Exception e) {
			e.printStackTrace();
		}
		
		return result;
	}

	public static String createKey(String targetId, String errorCode) {
		String result = targetId + "_" + errorCode;
		result = result.toLowerCase();
		return result;
	}

	public String createKey() {
		String result = dataName + "_" + errorCode;
		result = result.toLowerCase();
		return result;
	}
	
}