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 * obtain a copy of the License at
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// Portions Copyright [2018-2019] [Payara Foundation and/or its affiliates]
package com.sun.ejb.containers.interceptors;

import java.lang.reflect.Method;
import java.util.Set;
import java.util.Collections;
import java.util.HashMap;
import java.util.HashSet;
import java.util.Map;

public class InterceptorUtil {

    private static final Map, Set>> compatiblePrimitiveWrapper = createMapping();

    static Map, Set>> createMapping() {
        Map, Set>> mapping = new HashMap<>();
        mapping.put(byte.class, asSet(Byte.class));
        mapping.put(boolean.class, asSet(Boolean.class));
        mapping.put(char.class, asSet(Character.class));
        mapping.put(double.class, asSet(Byte.class, Short.class, Integer.class, Float.class, Double.class));
        mapping.put(float.class, asSet(Byte.class, Short.class, Integer.class, Float.class));
        mapping.put(int.class, asSet(Byte.class, Short.class, Integer.class));
        mapping.put(long.class, asSet(Byte.class, Short.class, Integer.class, Long.class));
        mapping.put(short.class, asSet(Byte.class, Short.class));
        return Collections.unmodifiableMap(mapping);
    }

    private static Set> asSet(Class... classes) {
        Set> set = new HashSet<>(classes.length);
        for (Class c : classes) {
            set.add(c);
        }
        return Collections.unmodifiableSet(set);
    }

    public static boolean hasCompatiblePrimitiveWrapper(Class type, Class typeTo) {
        Set> compatibles = compatiblePrimitiveWrapper.get(type);
        return compatibles != null && compatibles.contains(typeTo);
    }

    public static void checkSetParameters(Object[] params, Method method) {
        if( method == null) {
            throw new IllegalStateException("Internal Error: Got null method");
        }
        Class[] paramTypes = method.getParameterTypes();
        if (params == null) {
            if (paramTypes.length != 0) {
                throw new IllegalArgumentException("Wrong number of parameters for "
                        + " method: " + method);
            }
        } else {
            if (paramTypes.length != params.length) {
                throw new IllegalArgumentException("Wrong number of parameters for "
                        + " method: " + method);
            }
            int index = 0 ;
            for (Class type : paramTypes) {
                if (params[index] == null) {
                    if (type.isPrimitive()) {
                        throw new IllegalArgumentException("Parameter type mismatch for method "
                                + method.getName() + ".  Attempt to set a null value for Arg["
                                + index + "]. Expected a value of type: " + type.getName());
                    }
                } else if (type.isPrimitive()) {
                    Set> compatibles = compatiblePrimitiveWrapper.get(type);
                    if (! compatibles.contains(params[index].getClass())) {
                        throw new IllegalArgumentException("Parameter type mismatch for method "
                                + method.getName() + ".  Arg["
                                + index + "] type: " + params[index].getClass().getName()
                                + " is not compatible with the expected type: " + type.getName());
                    }
                } else if (! type.isAssignableFrom(params[index].getClass())) {
                    throw new IllegalArgumentException("Parameter type mismatch for method "
                            + method.getName() + ".  Arg["
                            + index + "] type: " + params[index].getClass().getName()
                            + " does not match the expected type: " + type.getName());
                }
                index++;
            }
        }
    }

}