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/*
 * 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 io.milton.http.fs;

import io.milton.http.*;
import io.milton.http.Request.Method;
import io.milton.http.exceptions.NotAuthorizedException;
import io.milton.http.http11.auth.DigestResponse;
import io.milton.resource.*;
import java.io.File;
import java.util.Date;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

/**
 *
 */
public abstract class FsResource implements Resource, MoveableResource, CopyableResource, LockableResource, DigestResource {

    private static final Logger log = LoggerFactory.getLogger(FsResource.class);
    File file;
    final FileSystemResourceFactory factory;
    final String host;
    String ssoPrefix;

    protected abstract void doCopy(File dest) throws NotAuthorizedException;

    public FsResource(String host, FileSystemResourceFactory factory, File file) {
        this.host = host;
        this.file = file;
        this.factory = factory;
    }

    public File getFile() {
        return file;
    }

    @Override
    public String getUniqueId() {
        String s = file.lastModified() + "_" + file.length() + "_" + file.getAbsolutePath();
        return s.hashCode() + "";
    }

	@Override
    public String getName() {
        return file.getName();
    }

	@Override
    public Object authenticate(String user, String password) {
        return factory.getSecurityManager().authenticate(user, password);
    }

    public Object authenticate(DigestResponse digestRequest) {
        return factory.getSecurityManager().authenticate(digestRequest);
    }

    public boolean isDigestAllowed() {
        return factory.isDigestAllowed();
    }

    @Override
    public boolean authorise(Request request, Method method, Auth auth) {
        boolean b = factory.getSecurityManager().authorise(request, method, auth, this);
        if( log.isTraceEnabled()) {
            log.trace("authorise: result=" + b);
        }
        return b;
    }

	@Override
    public String getRealm() {
        String r = factory.getRealm(this.host);
		if( r == null ) {
			throw new NullPointerException("Got null realm from: " + factory.getClass() + " for host=" + this.host);
		}
		return r;
    }

	@Override
    public Date getModifiedDate() {
        return new Date(file.lastModified());
    }

    public Date getCreateDate() {
        return null;
    }

    public int compareTo(Resource o) {
        return this.getName().compareTo(o.getName());
    }

    public void moveTo(CollectionResource newParent, String newName) {
        if (newParent instanceof FsDirectoryResource) {
            FsDirectoryResource newFsParent = (FsDirectoryResource) newParent;
            File dest = new File(newFsParent.getFile(), newName);
            boolean ok = this.file.renameTo(dest);
            if (!ok) {
                throw new RuntimeException("Failed to move to: " + dest.getAbsolutePath());
            }
            this.file = dest;
            factory.getWsManager().ifPresent(wsManager -> wsManager.notifyMoved(factory.toResourcePath(newFsParent.getFile()), factory.toResourcePath(file)));
        } else {
            throw new RuntimeException("Destination is an unknown type. Must be a FsDirectoryResource, is a: " + newParent.getClass());
        }
    }

    public void copyTo(CollectionResource newParent, String newName) throws NotAuthorizedException {
        if (newParent instanceof FsDirectoryResource) {
            FsDirectoryResource newFsParent = (FsDirectoryResource) newParent;
            File dest = new File(newFsParent.getFile(), newName);
            doCopy(dest);
            factory.getWsManager().ifPresent(wsManager -> wsManager.notifyCreated(factory.toResourcePath(dest)));
        } else {
            throw new RuntimeException("Destination is an unknown type. Must be a FsDirectoryResource, is a: " + newParent.getClass());
        }
    }

    public void delete() {
        boolean ok = file.delete();
        if (!ok) {
            throw new RuntimeException("Failed to delete");
        }
        factory.getWsManager().ifPresent(wsManager -> wsManager.notifyDeleted(factory.toResourcePath(file)));
    }

    public LockResult lock(LockTimeout timeout, LockInfo lockInfo) throws NotAuthorizedException {
        final LockResult lockResult = factory.getLockManager().lock(timeout, lockInfo, this);
        factory.getWsManager().ifPresent(wsManager -> wsManager.notifyLocked(factory.toResourcePath(file)));
        return lockResult;
    }

    public LockResult refreshLock(String token, LockTimeout timeout) throws NotAuthorizedException {
        final LockResult lockResult = factory.getLockManager().refresh(token, timeout, this);
        factory.getWsManager().ifPresent(wsManager -> wsManager.notifyLocked(factory.toResourcePath(file)));
        return lockResult;
    }

    public void unlock(String tokenId) throws NotAuthorizedException {
        factory.getLockManager().unlock(tokenId, this);
        factory.getWsManager().ifPresent(wsManager -> wsManager.notifyUnlocked(factory.toResourcePath(file)));
    }

    public LockToken getCurrentLock() {
        if (factory.getLockManager() != null) {
            return factory.getLockManager().getCurrentToken(this);
        } else {
            log.warn("getCurrentLock called, but no lock manager: file: " + file.getAbsolutePath());
            return null;
        }
    }
}