/*
 * 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.netbeans.modules.javascript2.editor;

import java.io.File;
import java.io.IOException;
import java.net.URI;
import java.util.Collection;
import java.util.HashSet;
import java.util.Iterator;
import java.util.LinkedList;
import java.util.List;
import java.util.Set;
import java.util.logging.Level;
import java.util.logging.Logger;
import org.netbeans.api.project.FileOwnerQuery;
import org.netbeans.api.project.Project;
import org.netbeans.modules.csl.api.CompletionProposal;
import org.openide.filesystems.FileObject;
import org.openide.filesystems.FileUtil;
import org.openide.util.Utilities;
import org.netbeans.api.queries.VisibilityQuery;
import org.openide.util.BaseUtilities;

/**
 *
 * @author Petr Pisl
 */
public class FileUtils {

    private static final String SLASH = "/"; //NOI18N
    private static final String FILE = "file"; // URI scheme

    private static final Logger LOG = Logger.getLogger(FileUtils.class.getName());

    public static FileObject findFileObject(final FileObject fromFO, final String path, boolean filesOnly) {
        FileObject parent = fromFO.getParent();
        FileObject targetFO;
        Project project = FileOwnerQuery.getOwner(fromFO);
        String projectDirectoryPath = ""; //NOI18N
        if (project != null) {
            FileObject projectDirectory = project.getProjectDirectory();
            projectDirectoryPath = projectDirectory.getPath();
        }
        if (parent != null && !path.isEmpty()) {
            while (parent != null && parent.getPath().contains(projectDirectoryPath)) {
                targetFO = parent.getFileObject(path);
                if (targetFO != null && (!filesOnly || (filesOnly && !targetFO.isFolder()))) {
                    return targetFO;
                }
                targetFO = parent.getFileObject(path + ".js");  // NOI18N
                if (targetFO != null) {
                    return targetFO;
                }
                parent = parent.getParent();
            }
        }

        return null;
    }

    public interface FileObjectFilter {

        boolean accept(FileObject file);

    }

    public static List<CompletionProposal> computeRelativeItems(
            Collection<? extends FileObject> relativeTo,
            final String prefix,
            int anchor,
            boolean addExtensions,
            boolean addRelativePrefix,
            FileObjectFilter filter) throws IOException {

        assert relativeTo != null;

        List<CompletionProposal> result = new LinkedList();

        int lastSlash = prefix.lastIndexOf('/');
        String pathPrefix;
        String filePrefix;

        if (lastSlash != (-1)) {
            pathPrefix = prefix.substring(0, lastSlash);
            filePrefix = prefix.substring(lastSlash + 1);
        } else {
            pathPrefix = null;
            filePrefix = prefix;
        }

        Set<FileObject> directories = new HashSet();
        File prefixFile = null;
        if (pathPrefix != null && !pathPrefix.startsWith(".")) { //NOI18N
            if (pathPrefix.length() == 0 && prefix.startsWith(SLASH)) {
                prefixFile = new File(SLASH); //NOI18N
            } else {
                prefixFile = new File(pathPrefix);
            }
        }
        if (prefixFile != null && prefixFile.exists()) {
            //absolute path
            File normalizeFile = FileUtil.normalizeFile(prefixFile);
            FileObject fo = FileUtil.toFileObject(normalizeFile);
            if (fo != null) {
                directories.add(fo);
            }
        } else {
            //relative path
            for (Iterator<? extends FileObject> it = relativeTo.iterator(); it.hasNext();) {
                FileObject f = it.next();
                if (pathPrefix != null) {
                    File toFile = FileUtil.toFile(f);
                    if (toFile != null) {
                        URI resolve;
                        try {
                            resolve = BaseUtilities.normalizeURI(Utilities.toURI(toFile).resolve(pathPrefix));
                        } catch (IllegalArgumentException ex) {
                            resolve = null;
                        }
                        if (resolve != null && (resolve.getScheme() == null || FILE.equals(resolve.getScheme()))) {
                            try {
                                File normalizedFile = FileUtil.normalizeFile(Utilities.toFile(resolve));
                                f = FileUtil.toFileObject(normalizedFile);
                            } catch (IllegalArgumentException e) {
                                 LOG.log(Level.FINE, "could not convert " + resolve + " to File", resolve);
                            }
                        }
                    } else {
                        f = f.getFileObject(pathPrefix);
                    }
                }

                if (f != null) {
                    if (!f.isFolder()) {
                        if (f.getParent() != null)
                        directories.add(f.getParent());
                    } else {
                        directories.add(f);
                    }
                }
            }
        }

        for (FileObject dir : directories) {
            FileObject[] children = dir.getChildren();

            for (int cntr = 0; cntr < children.length; cntr++) {
                FileObject current = children[cntr];

                if (VisibilityQuery.getDefault().isVisible(current) && current.getNameExt().toLowerCase().startsWith(filePrefix.toLowerCase()) && filter.accept(current)) {
                    int newAnchor = anchor - prefix.length();

                    result.add(new FSCompletionItem(current, pathPrefix != null ? pathPrefix + SLASH : ((filePrefix.isEmpty() && addRelativePrefix) ? "./" : ""), addExtensions, newAnchor)); //NOI18N
                }
            }
        }


        return result;
    }
}