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/*
 * Copyright 2012 McEvoy Software Ltd.
 *
 */
package io.milton.http.acl;

import io.milton.principal.PriviledgeList;
import io.milton.principal.DiscretePrincipal;
import io.milton.resource.AccessControlledResource;
import io.milton.resource.AccessControlledResource.Priviledge;
import io.milton.http.Auth;
import io.milton.http.Handler;
import io.milton.http.HttpExtension;
import io.milton.http.HttpManager;
import io.milton.http.http11.CustomPostHandler;
import io.milton.http.values.HrefList;
import io.milton.http.webdav.PropertyMap;
import io.milton.http.webdav.PropertyMap.StandardProperty;
import io.milton.http.webdav.WebDavProtocol;
import io.milton.property.PropertySource;
import io.milton.http.caldav.PrincipalSearchPropertySetReport;
import io.milton.http.webdav.PropFindPropertyBuilder;
import io.milton.http.webdav.PropFindXmlGenerator;
import io.milton.principal.PrincipalSearchService;
import io.milton.resource.PropFindableResource;
import io.milton.resource.Resource;
import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
import java.util.Set;
import javax.xml.namespace.QName;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

/**
 *
 * See http://webdav.org/specs/rfc3744.html
 *
 * @author brad
 */
public class ACLProtocol implements HttpExtension, PropertySource {

    private static final Logger log = LoggerFactory.getLogger(ACLProtocol.class);
    private final PropertyMap propertyMap;

    public ACLProtocol(WebDavProtocol webDavProtocol, PropFindPropertyBuilder propertyBuilder, PropFindXmlGenerator xmlGenerator, PrincipalSearchService principalSearchService) {
        propertyMap = new PropertyMap(WebDavProtocol.NS_DAV.getName());
        propertyMap.add(new PrincipalUrl());
        propertyMap.add(new PrincipalCollectionSetProperty());
        propertyMap.add(new CurrentUserPrincipalProperty());
        propertyMap.add(new CurrentUserPrivledges());

        log.debug("registering the ACLProtocol as a property source");
        webDavProtocol.addPropertySource(this);
        //Adding supported reports
        webDavProtocol.addReport(new PrincipalSearchPropertySetReport());
        webDavProtocol.addReport(new PrincipalPropertySearchReport(propertyBuilder, xmlGenerator, principalSearchService));        
    }

    /**
     * No methods currently defined
     *
     * @return
     */
    @Override
    public Set getHandlers() {
        return Collections.EMPTY_SET;
    }

    @Override
    public Object getProperty(QName name, Resource r) {
        log.debug("getProperty: " + name.getLocalPart());
        return propertyMap.getProperty(name, r);
    }

    @Override
    public void setProperty(QName name, Object value, Resource r) {
        log.debug("setProperty: " + name.getLocalPart());
        throw new UnsupportedOperationException("Not supported yet.");
    }

    @Override
    public PropertyMetaData getPropertyMetaData(QName name, Resource r) {
        log.debug("getPropertyMetaData: " + name.getLocalPart());
        return propertyMap.getPropertyMetaData(name, r);
    }

    @Override
    public void clearProperty(QName name, Resource r) {
        throw new UnsupportedOperationException("Not supported yet.");
    }

    @Override
    public List getAllPropertyNames(Resource r) {
        log.debug("getAllPropertyNames");
        List list = new ArrayList<>(propertyMap.getAllPropertyNames(r));
        return list;
    }

    @Override
    public List getCustomPostHandlers() {
        return null;
    }

    static class PrincipalUrl implements StandardProperty {

        @Override
        public String fieldName() {
            return "principal-URL";
        }

        @Override
        public HrefList getValue(PropFindableResource res) {
            if (res instanceof AccessControlledResource) {
                AccessControlledResource acr = (AccessControlledResource) res;
                String url = acr.getPrincipalURL();
                if (url != null) {
                    HrefList listOfOne = new HrefList();
                    listOfOne.add(url);
                    return listOfOne;
                } else {
                    return null;
                }
            } else {
                log.warn("requested property 'principal-url', but resource doesnt implement AccessControlledResource: " + res.getClass().getCanonicalName());
                return null;
            }
        }

        @Override
        public Class getValueClass() {
            return HrefList.class;
        }
    }

    /*
     
     /principals/
     
     */
    static class PrincipalCollectionSetProperty implements StandardProperty {

        @Override
        public String fieldName() {
            return "principal-collection-set";
        }

        @Override
        public HrefList getValue(PropFindableResource res) {
            if (res instanceof AccessControlledResource) {
                AccessControlledResource acr = (AccessControlledResource) res;
                return acr.getPrincipalCollectionHrefs();
            } else {
                return null;
            }

        }

        @Override
        public Class getValueClass() {
            return HrefList.class;
        }
    }

    static class CurrentUserPrincipalProperty implements StandardProperty {

        @Override
        public String fieldName() {
            return "current-user-principal";
        }

        @Override
        public HrefList getValue(PropFindableResource res) {
            Auth auth = HttpManager.request().getAuthorization();
            if (auth == null || auth.getTag() == null) {
                return null;
            } else {
                Object user = auth.getTag();
                if (user instanceof DiscretePrincipal) {
                    DiscretePrincipal p = (DiscretePrincipal) user;
                    HrefList hrefs = new HrefList();
                    hrefs.add(p.getPrincipalURL());
                    return hrefs;
                } else {
                    return null;
                }
            }
        }

        @Override
        public Class getValueClass() {
            return HrefList.class;
        }
    }

    static class CurrentUserPrivledges implements StandardProperty {

        @Override
        public String fieldName() {
            return "current-user-privilege-set";
        }

        @Override
        public PriviledgeList getValue(PropFindableResource res) {
            if (res instanceof AccessControlledResource) {
                AccessControlledResource acr = (AccessControlledResource) res;
                Auth auth = HttpManager.request().getAuthorization();
                List list = acr.getPriviledges(auth);
                return new PriviledgeList(list);
            } else {
                return null;
            }
        }

        @Override
        public Class getValueClass() {
            return PriviledgeList.class;
        }
    }
}