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package ru.saidgadjiev.proxymaker;

import java.lang.reflect.Method;

import static ru.saidgadjiev.proxymaker.ProxyFactoryHelper.*;

/**
 * Runtime support routines that the classes generated by ProxyFactory use.
 */
public final class ProxyRuntimeHelper {

    /**
     * Utils class can't be instantiated.
     */
    private ProxyRuntimeHelper() { }

    /**
     * Find method in {@code className} via reflection and return method reference {@link Method}.
     * @param className target class name
     * @param name target method name
     * @param parametrTypeClassNames target method fully qualified paramentr type names
     * @return method reference {@link Method}
     */
    public static Method findMethod(String className, String name, String[] parametrTypeClassNames) {
        try {
            Class[] parametrTypes = new Class[parametrTypeClassNames.length];
            int i = 0;

            for (String parametrTypeClassName: parametrTypeClassNames) {
                if (isPrimitive(parametrTypeClassName)) {
                    parametrTypes[i++] = PRIMITIVE_TYPES[typeIndex(parametrTypeClassName)];
                } else {
                    parametrTypes[i++] = Class.forName(parametrTypeClassName);
                }
            }
            return Class.forName(className).getMethod(name, parametrTypes);
        } catch (NoSuchMethodException e) {
            throw new NoSuchMethodError(e.getMessage());
        } catch (ClassNotFoundException e) {
            throw new NoClassDefFoundError(e.getMessage());
        }
    }
}