/******************************************************************************* 
 * Copyright (c) 2016 Red Hat, Inc. 
 * Distributed under license by Red Hat, Inc. All rights reserved. 
 * This program is made available under the terms of the 
 * Eclipse Public License v1.0 which accompanies this distribution, 
 * and is available at http://www.eclipse.org/legal/epl-v10.html 
 * 
 * Contributors: 
 * Red Hat, Inc. - initial API and implementation 
 ******************************************************************************/

package com.openshift.restclient.model;

import static org.mockito.Mockito.when;

import java.lang.reflect.Field;

import org.mockito.Mockito;

import com.openshift.internal.restclient.OpenShiftAPIVersion;
import com.openshift.internal.restclient.ResourceFactory;
import com.openshift.restclient.IClient;
import com.openshift.restclient.IResourceFactory;
import com.openshift.restclient.utils.Samples;

public class MocksFactory {

    private IClient client;
    private IResourceFactory factory;

    public MocksFactory() {
        this(Mockito.mock(IClient.class));
    }

    public MocksFactory(IClient client) {
        this.client = client;
        this.factory = new ResourceFactory(client);
    }

    public IClient getClient() {
        return client;
    }

    public <T extends IResource> T mock(Class<T> klass, String namespace, String name) {
        T mock = mock(klass);
        when(mock.getNamespaceName()).thenReturn(namespace);
        when(mock.getName()).thenReturn(name);
        return mock;
    }

    /**
     * Mock the given kind based on the class
     * 
     * @return a mocked instance with mocked name, version, and namespace
     */
    public <T extends IResource> T mock(Class<T> klass) {
        final String version = OpenShiftAPIVersion.v1.toString();
        T mock = Mockito.mock(klass);
        when(mock.getName()).thenReturn("a" + klass.getSimpleName());
        when(mock.getApiVersion()).thenReturn(version);
        when(mock.getNamespaceName()).thenReturn("aNamespace");
        when(mock.getKind()).thenReturn(klass.getSimpleName().substring(1));
        return mock;
    }

    /**
     * Stub a given kind based on the JSON files defined in {@link Samples}
     * 
     * @return a stubbed resource
     */
    public <T extends IResource> T stub(Class<T> kind) {
        String name = kind.getSimpleName();
        if (name.startsWith("I")) {
            name = name.substring(1);
        }
        return stub(name);
    }

    /**
     * Stub a given kind based on the JSON files defined in {@link Samples}
     * 
     * @return a stubbed resource
     */
    public <T extends IResource> T stub(String kind) {
        final String version = OpenShiftAPIVersion.v1.toString();
        String stub = String.format("%s_%s", version, splitCamelCase(kind, "_")).toUpperCase();
        try {
            Field field = Samples.class.getField(stub);
            Samples sample = (Samples) field.get(null);
            return factory.create(sample.getContentAsString());
        } catch (NoSuchFieldException | SecurityException | IllegalArgumentException | IllegalAccessException e) {
            throw new RuntimeException(String.format("Sample not found for kind %s"), e);
        }
    }

    /**
     * Split the camelcase string and delimit with the given delimiter
     * 
     * @param value
     *            the camelcase string
     * @param delimiter
     *            the delimiter for the resulting string
     */
    private String splitCamelCase(String value, String delimiter) {
        return value.replaceAll(String.format("%s|%s|%s", "(?<=[A-Z])(?=[A-Z][a-z])", "(?<=[^A-Z])(?=[A-Z])",
                "(?<=[A-Za-z])(?=[^A-Za-z])"), delimiter);
    }
}
