package org.jboss.resteasy.plugins.providers.jaxb;

import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.lang.annotation.Annotation;
import java.lang.reflect.Type;
import java.nio.charset.StandardCharsets;
import java.util.HashMap;
import java.util.Map;

import javax.xml.namespace.QName;
import javax.xml.transform.sax.SAXSource;
import javax.xml.transform.stream.StreamSource;

import jakarta.ws.rs.Consumes;
import jakarta.ws.rs.Produces;
import jakarta.ws.rs.WebApplicationException;
import jakarta.ws.rs.core.Context;
import jakarta.ws.rs.core.MediaType;
import jakarta.ws.rs.core.MultivaluedMap;
import jakarta.ws.rs.ext.ContextResolver;
import jakarta.ws.rs.ext.MessageBodyReader;
import jakarta.ws.rs.ext.Provider;
import jakarta.ws.rs.ext.Providers;
import jakarta.xml.bind.JAXBContext;
import jakarta.xml.bind.JAXBElement;
import jakarta.xml.bind.JAXBException;
import jakarta.xml.bind.Marshaller;
import jakarta.xml.bind.Unmarshaller;
import jakarta.xml.bind.annotation.XmlRootElement;
import jakarta.xml.bind.annotation.XmlSeeAlso;
import jakarta.xml.bind.annotation.XmlType;

import org.jboss.resteasy.annotations.providers.jaxb.DoNotUseJAXBProvider;
import org.jboss.resteasy.annotations.providers.jaxb.WrappedMap;
import org.jboss.resteasy.core.ResteasyContext;
import org.jboss.resteasy.core.messagebody.AsyncBufferedMessageBodyWriter;
import org.jboss.resteasy.plugins.providers.jaxb.i18n.LogMessages;
import org.jboss.resteasy.plugins.providers.jaxb.i18n.Messages;
import org.jboss.resteasy.spi.ResteasyConfiguration;
import org.jboss.resteasy.spi.util.FindAnnotation;
import org.jboss.resteasy.spi.util.Types;
import org.w3c.dom.Attr;
import org.w3c.dom.Element;
import org.w3c.dom.NamedNodeMap;
import org.xml.sax.InputSource;

/**
 * @author <a href="mailto:bill@burkecentral.com">Bill Burke</a>
 * @version $Revision: 1 $
 */
@Provider
@Produces({ "application/xml", "application/*+xml", "text/xml", "text/*+xml" })
@Consumes({ "application/xml", "application/*+xml", "text/xml", "text/*+xml" })
public class MapProvider implements MessageBodyReader<Object>, AsyncBufferedMessageBodyWriter<Object> {
    @Context
    protected Providers providers;
    private boolean disableExternalEntities = true;
    private boolean enableSecureProcessingFeature = true;
    private boolean disableDTDs = true;

    public MapProvider() {
        ResteasyConfiguration context = ResteasyContext.getContextData(ResteasyConfiguration.class);
        if (context != null) {
            String s = context.getParameter("resteasy.document.expand.entity.references");
            if (s != null) {
                setDisableExternalEntities(!Boolean.parseBoolean(s));
            }
            s = context.getParameter("resteasy.document.secure.processing.feature");
            if (s != null) {
                setEnableSecureProcessingFeature(Boolean.parseBoolean(s));
            }
            s = context.getParameter("resteasy.document.secure.disableDTDs");
            if (s != null) {
                setDisableDTDs(Boolean.parseBoolean(s));
            }
        }
    }

    protected JAXBContextFinder getFinder(MediaType type) {
        ContextResolver<JAXBContextFinder> resolver = providers.getContextResolver(JAXBContextFinder.class, type);
        if (resolver == null)
            return null;
        return resolver.getContext(null);
    }

    public boolean isReadable(Class<?> type, Type genericType, Annotation[] annotations, MediaType mediaType) {
        return isWrapped(type, genericType, annotations, mediaType);
    }

    protected boolean isWrapped(Class<?> type, Type genericType, Annotation[] annotations, MediaType mediaType) {
        if (Map.class.isAssignableFrom(type) && genericType != null) {
            Class<?> keyType = Types.getMapKeyType(genericType);
            if (keyType == null)
                return false;
            if (!CharSequence.class.isAssignableFrom(keyType) && !Number.class.isAssignableFrom(keyType))
                return false;

            Class<?> valueType = Types.getMapValueType(genericType);
            if (valueType == null)
                return false;
            valueType = XmlAdapterWrapper.xmlAdapterValueType(valueType, annotations);
            return (valueType.isAnnotationPresent(XmlRootElement.class) || valueType.isAnnotationPresent(XmlType.class)
                    || valueType.isAnnotationPresent(XmlSeeAlso.class) || JAXBElement.class.equals(valueType))
                    && (FindAnnotation.findAnnotation(valueType, annotations, DoNotUseJAXBProvider.class) == null)
                    && !IgnoredMediaTypes.ignored(valueType, annotations, mediaType);
        }
        return false;
    }

    public Object getJAXBObject(JAXBContextFinder finder, MediaType mediaType, Class<?> clazz, Element element)
            throws JAXBException {
        JAXBContext ctx = finder.findCachedContext(clazz, mediaType, null);
        return ctx.createUnmarshaller().unmarshal(element);
    }

    public Object readFrom(Class<Object> type, Type genericType, Annotation[] annotations, MediaType mediaType,
            MultivaluedMap<String, String> httpHeaders, InputStream entityStream) throws IOException, WebApplicationException {
        LogMessages.LOGGER.debugf("Provider : %s,  Method : readFrom", getClass().getName());
        JAXBContextFinder finder = getFinder(mediaType);
        if (finder == null) {
            throw new JAXBUnmarshalException(Messages.MESSAGES.unableToFindJAXBContext(mediaType));
        }
        Class valueType = Types.getMapValueType(genericType);
        XmlAdapterWrapper xmlAdapter = XmlAdapterWrapper.getXmlAdapter(valueType, annotations);
        if (xmlAdapter != null) {
            valueType = xmlAdapter.getValueType();
        }
        JaxbMap jaxbMap = null;
        JAXBElement<JaxbMap> ele = null;

        try {
            JAXBContext ctx = finder.findCacheContext(mediaType, annotations, JaxbMap.class, JaxbMap.Entry.class, valueType);
            if (needsSecurity()) {
                SAXSource source = null;
                if (getCharset(mediaType) == null) {
                    source = new SAXSource(new InputSource(new InputStreamReader(entityStream, StandardCharsets.UTF_8)));
                } else {
                    source = new SAXSource(new InputSource(entityStream));
                }
                Unmarshaller unmarshaller = ctx.createUnmarshaller();
                unmarshaller = new SecureUnmarshaller(unmarshaller, disableExternalEntities, enableSecureProcessingFeature,
                        disableDTDs);
                ele = unmarshaller.unmarshal(source, JaxbMap.class);
            } else {
                StreamSource source = null;
                if (getCharset(mediaType) == null) {
                    source = new StreamSource(new InputStreamReader(entityStream, StandardCharsets.UTF_8));
                } else {
                    source = new StreamSource(entityStream);
                }

                ele = ctx.createUnmarshaller().unmarshal(source, JaxbMap.class);
            }
            WrappedMap wrapped = FindAnnotation.findAnnotation(annotations, WrappedMap.class);
            if (wrapped != null) {
                if (!wrapped.map().equals(ele.getName().getLocalPart())) {
                    throw new JAXBUnmarshalException(
                            Messages.MESSAGES.mapWrappingFailedLocalPart(wrapped.map(), ele.getName().getLocalPart()));
                }
                if (!wrapped.namespace().equals(ele.getName().getNamespaceURI())) {
                    throw new JAXBUnmarshalException(
                            Messages.MESSAGES.mapWrappingFailedNamespace(wrapped.namespace(), ele.getName().getNamespaceURI()));
                }
            }

            jaxbMap = ele.getValue();

            HashMap<String, Object> map = new HashMap<String, Object>();

            Unmarshaller unmarshaller = ctx.createUnmarshaller();
            unmarshaller = AbstractJAXBProvider.decorateUnmarshaller(valueType, annotations, mediaType, unmarshaller);

            for (int i = 0; i < jaxbMap.getValue().size(); i++) {
                Element element = (Element) jaxbMap.getValue().get(i);
                NamedNodeMap attributeMap = element.getAttributes();
                String keyValue = null;
                if (wrapped != null) {
                    keyValue = element.getAttribute(wrapped.key());

                } else {
                    if (attributeMap.getLength() == 0)
                        throw new JAXBUnmarshalException(Messages.MESSAGES.mapWrappedFailedKeyAttribute());
                    for (int j = 0; j < attributeMap.getLength(); j++) {
                        Attr key = (Attr) attributeMap.item(j);
                        if (!key.getName().startsWith("xmlns")) {
                            keyValue = key.getValue();
                            break;
                        }
                    }

                }

                Object value = unmarshaller.unmarshal(element.getFirstChild());
                if (xmlAdapter != null) {
                    try {
                        value = xmlAdapter.unmarshal(value);
                    } catch (Exception e) {
                        throw new JAXBUnmarshalException(e);
                    }
                }
                map.put(keyValue, value);
            }
            return map;
        } catch (JAXBException e) {
            throw new JAXBUnmarshalException(e);
        }
    }

    public boolean isWriteable(Class<?> type, Type genericType, Annotation[] annotations, MediaType mediaType) {
        return isWrapped(type, genericType, annotations, mediaType);
    }

    public long getSize(Object entry, Class<?> type, Type genericType, Annotation[] annotations, MediaType mediaType) {
        return -1;
    }

    public void writeTo(Object target, Class<?> type, Type genericType, Annotation[] annotations, MediaType mediaType,
            MultivaluedMap<String, Object> httpHeaders, OutputStream entityStream) throws IOException, WebApplicationException {
        LogMessages.LOGGER.debugf("Provider : %s,  Method : writeTo", getClass().getName());
        JAXBContextFinder finder = getFinder(mediaType);
        if (finder == null) {
            throw new JAXBMarshalException(Messages.MESSAGES.unableToFindJAXBContext(mediaType));
        }
        Class valueType = Types.getMapValueType(genericType);
        XmlAdapterWrapper xmlAdapter = XmlAdapterWrapper.getXmlAdapter(valueType, annotations);
        if (xmlAdapter != null) {
            valueType = xmlAdapter.getValueType();
        }
        try {
            JAXBContext ctx = finder.findCacheContext(mediaType, annotations, JaxbMap.class, JaxbMap.Entry.class, valueType);

            String mapName = "map";
            String entryName = "entry";
            String keyName = "key";
            String namespaceURI = "";
            String prefix = "";

            WrappedMap wrapped = FindAnnotation.findAnnotation(annotations, WrappedMap.class);
            if (wrapped != null) {
                mapName = wrapped.map();
                entryName = wrapped.entry();
                namespaceURI = wrapped.namespace();
                prefix = wrapped.prefix();
                keyName = wrapped.key();
            }

            JaxbMap map = new JaxbMap(entryName, keyName, namespaceURI);

            @SuppressWarnings("unchecked")
            Map<Object, Object> targetMap = (Map) target;
            for (Map.Entry mapEntry : targetMap.entrySet()) {
                Object value = mapEntry.getValue();
                if (xmlAdapter != null) {
                    try {
                        value = xmlAdapter.marshal(value);
                    } catch (Exception e) {
                        throw new JAXBMarshalException(e);
                    }
                }
                map.addEntry(mapEntry.getKey().toString(), value);
            }

            JAXBElement<JaxbMap> jaxbMap = new JAXBElement<JaxbMap>(new QName(namespaceURI, mapName, prefix), JaxbMap.class,
                    map);
            Marshaller marshaller = ctx.createMarshaller();
            marshaller = AbstractJAXBProvider.decorateMarshaller(valueType, annotations, mediaType, marshaller);
            marshaller.marshal(jaxbMap, entityStream);
        } catch (JAXBException e) {
            throw new JAXBMarshalException(e);
        }
    }

    public boolean isDisableExternalEntities() {
        return disableExternalEntities;
    }

    public void setDisableExternalEntities(boolean disableExternalEntities) {
        this.disableExternalEntities = disableExternalEntities;
    }

    public boolean isEnableSecureProcessingFeature() {
        return enableSecureProcessingFeature;
    }

    public void setEnableSecureProcessingFeature(boolean enableSecureProcessingFeature) {
        this.enableSecureProcessingFeature = enableSecureProcessingFeature;
    }

    public boolean isDisableDTDs() {
        return disableDTDs;
    }

    public void setDisableDTDs(boolean disableDTDs) {
        this.disableDTDs = disableDTDs;
    }

    public static String getCharset(final MediaType mediaType) {
        if (mediaType != null) {
            return mediaType.getParameters().get("charset");
        }
        return null;
    }

    protected boolean needsSecurity() {
        return true;
    }
}
