package dev.peerat.framework;

import java.lang.reflect.Method;
import java.util.regex.Matcher;
import java.util.regex.Pattern;

public class RouteState {
	
	private Object instance;
	private Method method;
	private Route route;
	private Pattern pattern;
	private int[] bindMethod;
	
	public RouteState(Object instance, Method method, Route route){
		this.instance = instance;
		this.method = method;
		this.route = route;
		this.pattern = Pattern.compile(route.path());
		
		Class<?>[] parameters = method.getParameterTypes();
		this.bindMethod = new int[4];
		this.bindMethod[0] = findIndex(parameters, Matcher.class);
		this.bindMethod[1] = findIndex(parameters, Context.class);
		this.bindMethod[2] = findIndex(parameters, HttpReader.class);
		this.bindMethod[3] = findIndex(parameters, HttpWriter.class);
	}
	
	public Matcher match(String path){
		Matcher matcher = pattern.matcher(path);
		return matcher.matches() ? matcher : null;
	}
	
	public boolean isWebSocket(){
		return route.websocket();
	}
	
	public boolean needLogin(){
		return route.needLogin();
	}
	
	public Method getMethod(){
		return this.method;
	}
	
	public Object getInstance(){
		return this.instance;
	}
	
	public Object[] bindMethod(Matcher matcher, Context context, HttpReader reader, HttpWriter writer){
		Object[] result = new Object[method.getParameterCount()];
		setElement(result, bindMethod[0], matcher);
		setElement(result, bindMethod[1], context);
		setElement(result, bindMethod[2], reader);
		setElement(result, bindMethod[3], writer);
		return result;
	}
	
	private void setElement(Object[] array, int position, Object element){
		if(position < 0) return;
		array[position] = element; 
	}
	
	private int findIndex(Class<?>[] array, Class<?> type){
		for(int i = 0; i < array.length; i++){
			Class<?> clazz = array[i];
			if(type.isAssignableFrom(clazz)) return i;
		}
		return -1;
	}

}