/*
 * 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.tuscany.sca.domain.search.impl;

import java.io.IOException;
import java.io.InputStream;
import java.util.Enumeration;
import java.util.HashMap;
import java.util.zip.ZipEntry;
import java.util.zip.ZipFile;

/**
 * 
 * @version $Rev$ $Date$
 */
public class ZipFileContent implements FileContent {

    final private ZipFile file;

    final private ZipEntry entry;

    private FileContent[] children;

    private ZipFileContent(ZipFile file, ZipEntry entry) {
        this.file = file;
        this.entry = entry;

    }

    public InputStream getInputStream() throws IOException {
        return this.file.getInputStream(this.entry);
    }

    public String getPath() {
        return this.file.getName() + DomainPathAnalyzer.ARCHIVE_SEPARATOR + '/' + this.entry.getName();
    }

    public FileContent[] getChildren() {
        return this.children;
    }

    public String getName() {
        return this.entry.getName();
        // int lastSlashIndex = name.lastIndexOf('/');
        //
        // if (lastSlashIndex == -1) {
        // return name;
        // }
        //
        // if (lastSlashIndex == name.length() - 1 && name.length() > 1) {
        // lastSlashIndex = name.lastIndexOf('/', name.length() - 2);
        //
        // if (lastSlashIndex == -1) {
        // return name.substring(0, name.length() - 1);
        // }
        //
        // return name.substring(lastSlashIndex + 1, name.length() - 1);
        //
        // }
        //
        // return name.substring(lastSlashIndex + 1);

    }

    public boolean isLeaf() {
        return !this.entry.isDirectory();
    }

    public static ZipFileContent[] createZipFileContent(ZipFile file) {
        Enumeration<? extends ZipEntry> entries = file.entries();

        if (!entries.hasMoreElements()) {
            return null;
        }

        HashMap<String, ZipMap> roots = new HashMap<String, ZipMap>();

        do {
            ZipEntry entry = entries.nextElement();
            String name = entry.getName();

            if (name.length() > 0) {

                String[] path = name.split("/");

                ZipMap current = roots.get(path[0]);

                if (current == null) {
                    current = new ZipMap();
                    roots.put(path[0], current);

                    if (path.length == 1) {
                        current.setEntry(file, entry);
                        continue;

                    }

                }

                for (int i = 1; i < path.length - 1; i++) {
                    ZipMap actual = current.get(path[i]);

                    if (actual == null) {
                        actual = new ZipMap();
                        current.put(path[i], actual);

                    }

                    current = actual;

                }

                ZipMap entryMap = current.get(path[path.length - 1]);

                if (entryMap == null) {
                    entryMap = new ZipMap();
                    current.put(path[path.length - 1], entryMap);

                }

                entryMap.setEntry(file, entry);

            }

        } while (entries.hasMoreElements());

        for (ZipMap map : roots.values()) {
            createZipFileContentChildren(map);
        }

        ZipFileContent[] ret = new ZipFileContent[roots.size()];
        int i = 0;

        for (ZipMap rootMap : roots.values()) {
            ret[i++] = rootMap.zipContent;
        }

        return ret;

    }

    public static ZipFileContent createZipFileContent(ZipFile file, String filePath) {

        Enumeration<? extends ZipEntry> entries = file.entries();

        if (!entries.hasMoreElements()) {
            return null;
        }

        int beginIndex;
        int endIndex;

        if (filePath.charAt(0) == '/') {
            beginIndex = 1;

        } else {
            beginIndex = 0;
        }

        ZipMap root = new ZipMap();

        if (filePath.length() > 1 && filePath.charAt(filePath.length() - 1) == '/') {
            endIndex = filePath.length() - 1;

        } else {
            endIndex = filePath.length();
        }

        filePath = filePath.substring(beginIndex, endIndex);
        // HashMap<String, ZipMap> roots = new HashMap<String, ZipMap>();

        do {
            ZipEntry entry = entries.nextElement();
            String name = entry.getName();

            if (name.length() > 0) {

                if (name.charAt(name.length() - 1) == '/') {
                    endIndex = 1;

                } else {
                    endIndex = 0;
                }

                if (name.length() - endIndex == filePath.length()) {
                    root.setEntry(file, entry);

                } else if (filePath.length() == 0 || (name.startsWith(filePath) && name.charAt(filePath.length()) == '/')) {

                    name = name.substring(filePath.length());
                    String[] path = name.split("/");

                    ZipMap current = root;

                    // if (current == null) {
                    // current = new ZipMap();
                    // roots.put(path[0], current);
                    //
                    // if (path.length == 1) {
                    // current.setEntry(file, entry);
                    // continue;
                    //
                    // }
                    //
                    // }

                    if (path.length > 0) {

                        int i;

                        if (path[0].length() == 0) {
                            i = 1;

                        } else {
                            i = 0;
                        }

                        for (; i < path.length - 1; i++) {
                            ZipMap actual = current.get(path[i]);

                            if (actual == null) {
                                actual = new ZipMap();
                                current.put(path[i], actual);

                            }

                            current = actual;

                        }

                        ZipMap entryMap = current.get(path[path.length - 1]);

                        if (entryMap == null) {
                            entryMap = new ZipMap();
                            current.put(path[path.length - 1], entryMap);

                        }

                        entryMap.setEntry(file, entry);

                    }

                }

            }

        } while (entries.hasMoreElements());

        createZipFileContentChildren(root);

        return root.zipContent;

    }

    private static void createZipFileContentChildren(ZipMap map) {
        ZipFileContent[] children = new ZipFileContent[map.size()];
        int i = 0;

        for (ZipMap childMap : map.values()) {

            if (childMap.zipContent == null) {
                throw new RuntimeException("could not load zip file hierarchy for file: " + map.zipContent.file);
            }

            children[i++] = childMap.zipContent;

            createZipFileContentChildren(childMap);

        }

        map.zipContent.children = children;

    }

    @Override
    public String toString() {
        return this.file.getName() + '/' + this.entry.getName();
    }

    private static class ZipMap extends HashMap<String, ZipMap> {

        private static final long serialVersionUID = 6514645087432837480L;

        ZipFileContent zipContent;

        void setEntry(ZipFile zipFile, ZipEntry entry) {
            this.zipContent = new ZipFileContent(zipFile, entry);
        }

        ZipFileContent[] getChildren() {

            ZipFileContent ret[] = new ZipFileContent[this.size()];
            int i = 0;

            for (ZipMap actual : this.values()) {
                ret[i++] = actual.zipContent;
            }

            return ret;

        }

    }

}