/*
 * 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.pig.backend.local.datastorage;

import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.io.File;
import java.util.Map;
import java.util.HashMap;
import java.util.Properties;

import org.apache.pig.backend.datastorage.DataStorage;
import org.apache.pig.backend.datastorage.ElementDescriptor;
import org.apache.pig.backend.datastorage.SeekableInputStream;

public abstract class LocalPath implements ElementDescriptor {

    protected DataStorage fs;
    protected File path;

    protected File getCurPath() {
        File path;
        
        if (this.path.isAbsolute()) {
            path = this.path;
        }
        else {
            path = new File(fs.getActiveContainer().toString(),
                            this.path.getPath());
        }
        
        return path;
    }
    
    public LocalPath(LocalDataStorage fs, String path) {
        this.fs = fs;
        this.path = new File(path);
    }
    
    public LocalPath(LocalDataStorage fs, File path) {
        this.fs = fs;
        this.path = new File(path.getPath());
    }
    
    public LocalPath(LocalDataStorage fs, String parent, String child) {
        this.fs = fs;
        this.path = new File(parent, child);
    }
    
    public LocalPath(LocalDataStorage fs, File parent, File child) {
        this.fs = fs;
        this.path = new File(parent.getPath(),
                             child.getPath());
    }
    
    public LocalPath(LocalDataStorage fs, File parent, String child) {
        this(fs, parent.getPath(), child);
    }
    
    public LocalPath(LocalDataStorage fs, String parent, File child) {
        this(fs, parent, child.getPath());
    }
    
    public DataStorage getDataStorage() {
        return fs;
    }
    
    public File getPath() {
        return this.path;
    }

    public abstract OutputStream create(Properties configuration) 
            throws IOException;

    public OutputStream create() 
            throws IOException {
        return create(null);
    }

    public abstract void copy(ElementDescriptor dstName,
                              Properties dstConfiguration,
                              boolean removeSrc) 
            throws IOException;
        
    public void copy(ElementDescriptor dstName,
                     boolean removeSrc) throws IOException {
        copy(dstName, null, removeSrc);
    }
                
    public abstract InputStream open() throws IOException;

    public abstract SeekableInputStream sopen() throws IOException;
        
    public boolean exists() throws IOException {
        return getCurPath().exists();
    }
    
    public void rename(ElementDescriptor newName) 
            throws IOException {
        if (! this.path.renameTo(((LocalPath)newName).path)) {
            throw new IOException("Unalbe to rename " + this.path +
                                  "to " + ((LocalPath)newName).path);
        }
    }

    public void delete() throws IOException {
        getCurPath().delete();
    }

    public Properties getConfiguration() throws IOException {
        Properties props = new Properties();
        
        props.put(BLOCK_REPLICATION_KEY, "1");
        
        return props;
    }

    public void updateConfiguration(Properties newConfig) 
            throws IOException {
        ;
    }
        
    public Map<String, Object> getStatistics() throws IOException {
        Map<String, Object> stats = new HashMap<String, Object>();

        long size = this.path.length();
        stats.put(LENGTH_KEY, size);

        stats.put(BLOCK_REPLICATION_KEY, (short) 1);

        long lastModified = this.path.lastModified();
        stats.put(MODIFICATION_TIME_KEY, lastModified);
        
        return stats;
    }

    public int compareTo(ElementDescriptor other) {
        return this.path.compareTo(((LocalPath)other).path);
    }

    public boolean systemElement(){
        return false;
    }
    
    public String toString() {
        return this.path.toString();
    }
}