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package org.robobinding.function;

import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.text.MessageFormat;
import java.util.List;

import com.google.common.base.Joiner;
import com.google.common.collect.Lists;

/**
 * 
 * @since 1.0
 * @version $Revision: 1.0 $
 * @author Cheng Wei
 */
class FunctionImpl implements Function {
	private Object object;
	Method method;

	public FunctionImpl(Object object, Method method) {
		this.object = object;
		this.method = method;
	}

	@Override
	public Object call(Object... args) {
		try {
			return method.invoke(object, args);
		} catch (IllegalArgumentException e) {
			throw new RuntimeException(e);
		} catch (IllegalAccessException e) {
			throw new RuntimeException(e);
		} catch (InvocationTargetException e) {
			throw new RuntimeException("Error occurred when invoking method '" + describeMethod() + "', please check the original error stack below",
					e.getCause());
		}
	}

	private String describeMethod() {
		List parameterTypesInString = getParameterTypesInString();

		return MessageFormat.format("{0}.{1}({2})", 
				method.getDeclaringClass().getName(), 
				method.getName(), 
				Joiner.on(", ").join(parameterTypesInString));
	}

	private List getParameterTypesInString() {
		Class[] parameterTypes = method.getParameterTypes();
		List parameterTypesInString = Lists.newArrayList();
		for (Class parameterType : parameterTypes) {
			parameterTypesInString.add(parameterType.getName());
		}
		return parameterTypesInString;
	}
}