/**
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements. See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership. The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License. You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied. See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */

package org.apache.cxf.jaxrs.model;

import java.lang.reflect.Field;
import java.lang.reflect.Method;
import java.util.Collection;
import java.util.Collections;
import java.util.HashSet;
import java.util.List;
import java.util.Set;
import java.util.concurrent.ConcurrentHashMap;

import javax.ws.rs.BeanParam;
import javax.ws.rs.Consumes;
import javax.ws.rs.Path;
import javax.ws.rs.Produces;
import javax.ws.rs.core.Application;
import javax.ws.rs.core.MediaType;

import org.apache.cxf.Bus;
import org.apache.cxf.BusFactory;
import org.apache.cxf.common.util.ClassHelper;
import org.apache.cxf.jaxrs.lifecycle.ResourceProvider;
import org.apache.cxf.jaxrs.provider.ServerProviderFactory;
import org.apache.cxf.jaxrs.utils.AnnotationUtils;
import org.apache.cxf.jaxrs.utils.InjectionUtils;
import org.apache.cxf.jaxrs.utils.JAXRSUtils;
import org.apache.cxf.jaxrs.utils.ResourceUtils;
import org.apache.cxf.message.Message;

public class ClassResourceInfo extends BeanResourceInfo {

    private URITemplate uriTemplate;
    private MethodDispatcher methodDispatcher;
    private ResourceProvider resourceProvider;
    private ConcurrentHashMap<SubresourceKey, ClassResourceInfo> subResources
        = new ConcurrentHashMap<>();

    private boolean enableStatic;
    private boolean createdFromModel;
    private String consumesTypes;
    private String producesTypes;
    private List<MediaType> defaultConsumes = Collections.singletonList(JAXRSUtils.ALL_TYPES);
    private List<MediaType> defaultProduces = Collections.singletonList(JAXRSUtils.ALL_TYPES);
    private Set<String> nameBindings = Collections.emptySet();
    private ClassResourceInfo parent;
    private Set<String> injectedSubInstances = new HashSet<>();
    public ClassResourceInfo(ClassResourceInfo cri) {
        super(cri.getBus());
        if (cri.isCreatedFromModel() && !InjectionUtils.isConcreteClass(cri.getServiceClass())) {
            this.root = cri.root;
            this.serviceClass = cri.serviceClass;
            this.uriTemplate = cri.uriTemplate;
            this.methodDispatcher = new MethodDispatcher(cri.methodDispatcher, this);
            this.subResources = cri.subResources;
            //CHECKSTYLE:OFF
            this.paramFields = cri.paramFields;
            this.paramMethods = cri.paramMethods;
            //CHECKSTYLE:ON
            this.enableStatic = true;
            this.nameBindings = cri.nameBindings;
            this.parent = cri.parent;
        } else {
            throw new IllegalArgumentException();
        }

    }

    public ClassResourceInfo(Class<?> theResourceClass, Class<?> theServiceClass,
                             boolean theRoot, boolean enableStatic, Bus bus) {
        super(theResourceClass, theServiceClass, theRoot, theRoot || enableStatic, bus);
        this.enableStatic = enableStatic;
        if (resourceClass != null) {
            nameBindings = AnnotationUtils.getNameBindings(bus, serviceClass);
        }
    }
    //CHECKSTYLE:OFF
    public ClassResourceInfo(Class<?> theResourceClass, Class<?> theServiceClass,
                             boolean theRoot, boolean enableStatic, Bus bus, List<MediaType> defaultProduces,
                             List<MediaType> defaultConsumes) {
    //CHECKSTYLE:ON
        this(theResourceClass, theServiceClass, theRoot, enableStatic, bus);
        if (defaultProduces != null) {
            this.defaultProduces = defaultProduces;
        }
        if (defaultConsumes != null) {
            this.defaultConsumes = defaultConsumes;
        }
    }
    public ClassResourceInfo(Class<?> theResourceClass, Class<?> theServiceClass,
                             boolean theRoot, boolean enableStatic, boolean createdFromModel, Bus bus) {
        this(theResourceClass, theServiceClass, theRoot, enableStatic, bus);
        this.createdFromModel = createdFromModel;
    }
    //CHECKSTYLE:OFF
    public ClassResourceInfo(Class<?> theResourceClass, Class<?> theServiceClass,
                             boolean theRoot, boolean enableStatic, boolean createdFromModel,
                             String consumesTypes, String producesTypes, Bus bus) {
    //CHECKSTYLE:ON
        this(theResourceClass, theServiceClass, theRoot, enableStatic, createdFromModel, bus);
        this.consumesTypes = consumesTypes;
        this.producesTypes = producesTypes;
    }

    // The following constructors are used by tests only
    public ClassResourceInfo(Class<?> theResourceClass) {
        this(theResourceClass, true);
    }

    public ClassResourceInfo(Class<?> theResourceClass, boolean theRoot) {
        this(theResourceClass, theResourceClass, theRoot);
    }

    public ClassResourceInfo(Class<?> theResourceClass, Class<?> theServiceClass) {
        this(theResourceClass, theServiceClass, false);
    }

    public ClassResourceInfo(Class<?> theResourceClass, Class<?> theServiceClass, boolean theRoot) {
        this(theResourceClass, theServiceClass, theRoot, false, BusFactory.getDefaultBus(true));
    }

    public ClassResourceInfo findResource(Class<?> typedClass, Class<?> instanceClass) {
        instanceClass = enableStatic ? typedClass : instanceClass;
        SubresourceKey key = new SubresourceKey(typedClass, instanceClass);
        return subResources.get(key);
    }

    @Override
    public boolean contextsAvailable() {
        // avoid re-injecting the contexts if the root acts as subresource
        return super.contextsAvailable() && (isRoot() || parent != null);
    }

    public ClassResourceInfo getSubResource(Class<?> typedClass, Class<?> instanceClass) {
        return getSubResource(typedClass, instanceClass, null, enableStatic, null);
    }

    public ClassResourceInfo getSubResource(Class<?> typedClass, Class<?> instanceClass, Object instance) {
        instanceClass = enableStatic && typedClass != Object.class ? typedClass : instanceClass;
        return getSubResource(typedClass, instanceClass, instance, enableStatic, JAXRSUtils.getCurrentMessage());
    }

    public ClassResourceInfo getSubResource(Class<?> typedClass,
                                            Class<?> instanceClass,
                                            Object instance,
                                            boolean resolveContexts,
                                            Message message) {

        SubresourceKey key = new SubresourceKey(typedClass, instanceClass);
        ClassResourceInfo cri = subResources.get(key);
        if (cri == null) {
            cri = ResourceUtils.createClassResourceInfo(typedClass, instanceClass, this, false, resolveContexts,
                                                        getBus());
            if (cri != null) {
                if (message != null) {
                    cri.initBeanParamInfo(ServerProviderFactory.getInstance(message));
                }
                subResources.putIfAbsent(key, cri);
            }
        }
        // this branch will run only if ResourceContext is used
        // or static resolution is enabled for subresources initialized
        // from within singleton root resources (not default)
        if (resolveContexts && cri != null && cri.isSingleton() && instance != null && cri.contextsAvailable()) {
            synchronized (this) {
                if (!injectedSubInstances.contains(instance.toString())) {
                    Application app = null;
                    if (message != null) {
                        ProviderInfo<?> appProvider =
                            (ProviderInfo<?>)message.getExchange().getEndpoint().get(Application.class.getName());
                        if (appProvider != null) {
                            app = (Application)appProvider.getProvider();
                        }
                    }
                    InjectionUtils.injectContextProxiesAndApplication(cri, instance, app, null);
                    injectedSubInstances.add(instance.toString());
                }
            }
        }

        return cri;
    }

    public void addSubClassResourceInfo(ClassResourceInfo cri) {
        subResources.putIfAbsent(new SubresourceKey(cri.getResourceClass(),
                                            cri.getServiceClass()),
                                 cri);
    }

    public Collection<ClassResourceInfo> getSubResources() {
        return Collections.unmodifiableCollection(subResources.values());
    }

    public Set<String> getNameBindings() {
        if (parent == null) {
            return nameBindings;
        }
        return parent.getNameBindings();
    }

    public void setNameBindings(Set<String> names) {
        nameBindings = names;
    }

    public Set<String> getAllowedMethods() {
        Set<String> methods = new HashSet<>();
        for (OperationResourceInfo o : methodDispatcher.getOperationResourceInfos()) {
            String method = o.getHttpMethod();
            if (method != null) {
                methods.add(method);
            }
        }
        return methods;
    }


    public URITemplate getURITemplate() {
        return uriTemplate;
    }

    public void setURITemplate(URITemplate u) {
        uriTemplate = u;
    }

    public MethodDispatcher getMethodDispatcher() {
        return methodDispatcher;
    }

    public void setMethodDispatcher(MethodDispatcher md) {
        methodDispatcher = md;
    }

    public boolean hasSubResources() {
        return !subResources.isEmpty();
    }


    public boolean isCreatedFromModel() {
        return createdFromModel;
    }

    public ResourceProvider getResourceProvider() {
        return resourceProvider;
    }

    public void setResourceProvider(ResourceProvider rp) {
        resourceProvider = rp;
    }

    public List<MediaType> getProduceMime() {
        if (producesTypes != null) {
            return JAXRSUtils.parseMediaTypes(producesTypes);
        }
        Produces produces = AnnotationUtils.getClassAnnotation(getServiceClass(), Produces.class);
        if (produces != null || parent == null) {
            return JAXRSUtils.getProduceTypes(produces, defaultProduces);
        }
        return parent.getProduceMime();
    }

    public List<MediaType> getConsumeMime() {
        if (consumesTypes != null) {
            return JAXRSUtils.parseMediaTypes(consumesTypes);
        }
        Consumes consumes = AnnotationUtils.getClassAnnotation(getServiceClass(), Consumes.class);
        if (consumes != null || parent == null) {
            return JAXRSUtils.getConsumeTypes(consumes, defaultConsumes);
        }
        return parent.getConsumeMime();
    }

    public Path getPath() {
        return AnnotationUtils.getClassAnnotation(getServiceClass(), Path.class);
    }

    @Override
    public boolean isSingleton() {
        if (parent == null) {
            return resourceProvider != null && resourceProvider.isSingleton();
        }
        return parent.isSingleton();
    }

    public void setParent(ClassResourceInfo parent) {
        this.parent = parent;
    }

    public ClassResourceInfo getParent() {
        return parent;
    }

    public void initBeanParamInfo(ServerProviderFactory factory) {
        if (factory != null) {
            Set<OperationResourceInfo> oris = getMethodDispatcher().getOperationResourceInfos();
            for (OperationResourceInfo ori : oris) {
                List<Parameter> params = ori.getParameters();
                for (Parameter param : params) {
                    if (param.getType() == ParameterType.BEAN) {
                        Class<?> cls = ori.getMethodToInvoke().getParameterTypes()[param.getIndex()];
                        BeanParamInfo bpi = new BeanParamInfo(cls, getBus());
                        factory.addBeanParamInfo(bpi);
                    }
                }
            }
            List<Method> methods = super.getParameterMethods();
            for (Method m : methods) {
                if (m.getAnnotation(BeanParam.class) != null) {
                    BeanParamInfo bpi = new BeanParamInfo(m.getParameterTypes()[0], getBus());
                    factory.addBeanParamInfo(bpi);
                }
            }
            List<Field> fields = super.getParameterFields();
            for (Field f : fields) {
                if (f.getAnnotation(BeanParam.class) != null) {
                    BeanParamInfo bpi = new BeanParamInfo(f.getType(), getBus());
                    factory.addBeanParamInfo(bpi);
                }
            }
        }
    }

    @Override
    public void clearThreadLocalProxies() {
        super.clearThreadLocalProxies();
        if (!injectedSubInstances.isEmpty()) {
            for (ClassResourceInfo sub : subResources.values()) {
                if (sub != this) {
                    sub.clearThreadLocalProxies();
                }
            }
        }
    }

    public void injectContexts(Object resourceObject, OperationResourceInfo ori, Message inMessage) {
        final boolean contextsAvailable = contextsAvailable();
        final boolean paramsAvailable = paramsAvailable();
        if (contextsAvailable || paramsAvailable) {
            Object realResourceObject = ClassHelper.getRealObject(resourceObject);
            if (paramsAvailable) {
                JAXRSUtils.injectParameters(ori, this, realResourceObject, inMessage);
            }
            if (contextsAvailable) {
                InjectionUtils.injectContexts(realResourceObject, this, inMessage);
            }
        }
    }
}