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package com.rbkmoney.woody.api.proxy;

import com.rbkmoney.woody.api.proxy.tracer.MethodCallTracer;

import java.lang.reflect.Method;
import java.lang.reflect.Proxy;
import java.util.Arrays;

public class ProxyFactory {
    private final Object object = new Object();
    private final MethodCallerFactory callerFactory;
    private final MethodCallTracer callTracer;
    private final boolean allowObjectOverriding;

    public ProxyFactory(MethodCallTracer callTracer, boolean allowObjectOverriding) {
        this(new ReflectionMethodCallerFactory(), callTracer, allowObjectOverriding);
    }

    public ProxyFactory(MethodCallerFactory callerFactory, MethodCallTracer callTracer, boolean allowObjectOverriding) {
        this.callerFactory = callerFactory;
        this.callTracer = callTracer;
        this.allowObjectOverriding = allowObjectOverriding;
    }

    public  T getInstance(Class iface, InvocationTargetProvider targetProvider) {
        return getInstance(iface, targetProvider, callerFactory, callTracer, allowObjectOverriding);
    }

    @SuppressWarnings("unchecked")
    public  T getInstance(Class iface, InvocationTargetProvider targetProvider, MethodCallerFactory callerFactory, MethodCallTracer callTracer, boolean allowObjectOverriding) {
        if (!allowObjectOverriding) {
            Method[] overriden = MethodShadow.getShadowedMethods(object, iface);
            if (overriden.length != 0) {
                throw new IllegalArgumentException("Target interface " + iface.getName() + "shadows Object methods:" + Arrays.toString(overriden));
            }
        }
        return makeProxy(iface, targetProvider, callerFactory, callTracer);

    }

    protected  T makeProxy(Class iface, InvocationTargetProvider targetProvider, MethodCallerFactory callerFactory, MethodCallTracer callTracer) {

        return (T) Proxy.newProxyInstance(
                iface.getClassLoader(),
                new Class[]{iface},
                new ProxyInvocationHandler(iface, targetProvider, callerFactory, MethodCallInterceptors.trackedCallInterceptor(callTracer)));

    }
}