/*
 * Copyright (c) 2011-2024 Progress Software Corporation and/or its subsidiaries or affiliates. All Rights Reserved.
 *
 * Licensed 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 com.marklogic.contentpump;

import java.io.IOException;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.apache.hadoop.conf.Configurable;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.fs.FileStatus;
import org.apache.hadoop.fs.FileSystem;
import org.apache.hadoop.fs.Path;
import org.apache.hadoop.fs.PathFilter;

/**
 * The configured input file pattern applied to input file path.
 * @author ali
 *
 */
public class DocumentPathFilter implements PathFilter, Configurable {
    public static final Log LOG = LogFactory.getLog(DocumentPathFilter.class);
    private String pattern;
    private Configuration conf;
    private FileSystem fs;
    
    public String getPattern() {
        return pattern;
    }

    public void setPattern(String pattern) {
        this.pattern = pattern;
    }

    @Override
    public boolean accept(Path inPath) {
        String filename = inPath.getName();
        if (filename.matches(pattern)) {
            return true;
        }
        // take care of the case when INPUT_FILE_PATH is a DIR
        try {
            FileStatus[] status = fs.globStatus(inPath);
            if (status == null) {
                throw new IOException(
                    "Path in input_file_path doesn't exist: " + inPath);
            }
            for (FileStatus s : status) {
                if (s.isDirectory()) {
                    return true;
                }
            }
        } catch (IllegalArgumentException e) {
            LOG.warn("Skipped path: " + inPath + ", reason: " + e.getMessage());
        } catch (IOException e) {
            e.printStackTrace();
        }
        return false;
    }

    @Override
    public Configuration getConf() {
        return conf;
    }

    @Override
    public void setConf(Configuration conf) {
        this.conf = conf;
        pattern = conf.get(ConfigConstants.CONF_INPUT_FILE_PATTERN, ".*");
        String inPath = conf.get(ConfigConstants.CONF_INPUT_DIRECTORY);
        if (LOG.isDebugEnabled()) {
            LOG.debug(ConfigConstants.CONF_INPUT_DIRECTORY + ": " + inPath);
        }
        Path path = new Path(inPath);
        try {
            fs = FileSystem.get(path.toUri(), conf);
        } catch (IOException e) {
            LOG.error("Please check path: " + inPath, e);
        }
    }

}
