package com.comerica.zk;

import java.util.HashMap;
import java.util.Map;

import org.apache.log4j.Logger;
import org.zkoss.xel.Function;
import org.zkoss.xel.FunctionMapper;
import org.zkoss.xel.XelException;

import com.comerica.zk.datasource.DatasourceException;
import com.comerica.zk.fn.Asdf;
import com.comerica.zk.fn.Ds;

public class COFunctionMapper implements FunctionMapper {
	
	public static final Logger LOGGER = Logger.getLogger(COFunctionMapper.class);
	
	private Map<String,Function> functionMap = null;
	
	private COSheet cosheet;

	public COFunctionMapper(COSheet cosheet) {
		this.cosheet = cosheet;
		
	}
	
	@Override
	public Function resolveFunction(String prefix, String name) throws XelException {
		LOGGER.info(this.hashCode() + " : resolveFunction(" + prefix + "," + name + ")");

		Function resolved = null;
		if("zss".equals(prefix)){
			resolved = getFunctionMap().get(name.trim().toLowerCase());
		}
		return resolved;
	}
	
	private Map<String,Function> getFunctionMap() throws XelException{
		buildFunctionMap();
		return functionMap;
	}
	
	private void buildFunctionMap() throws XelException{
		functionMap = new HashMap<String,Function>();
		try{
			functionMap.put("asdf", new Asdf());
			functionMap.put("ds", new Ds(cosheet));
		}catch(DatasourceException e){
			throw new XelException("There was an error building the map of custom functions", e);
		}
	}
	
}