/*
 * Zed Attack Proxy (ZAP) and its related class files.
 *
 * ZAP is an HTTP/HTTPS proxy for assessing web application security.
 *
 * Copyright 2015 The ZAP Development Team
 *
 * 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 org.zaproxy.zap.extension.zest;

import java.io.BufferedReader;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.InputStreamReader;
import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;
import org.apache.logging.log4j.LogManager;
import org.apache.logging.log4j.Logger;

public class FileFuzzer {

    private File file = null;
    private int length = -1;
    private List<String> fuzzStrs = new ArrayList<>();
    private Iterator<String> iter = null;
    private static final Logger LOGGER = LogManager.getLogger(FileFuzzer.class);

    protected FileFuzzer(File file) {
        this.file = file;
    }

    private void init() {
        BufferedReader in = null;

        try {
            in = new BufferedReader(new InputStreamReader(new FileInputStream(file)));

            String line;

            while ((line = in.readLine()) != null) {
                if (line.trim().length() > 0 && !line.startsWith("#")) {
                    fuzzStrs.add(line);
                }
            }

        } catch (FileNotFoundException e) {
            LOGGER.error(e.getMessage(), e);
        } catch (IOException e) {
            LOGGER.error(e.getMessage(), e);
        } finally {
            if (in != null) {
                try {
                    in.close();
                } catch (IOException e) {
                    LOGGER.error(e.getMessage(), e);
                }
            }
        }

        length = fuzzStrs.size();
        iter = fuzzStrs.iterator();
    }

    public Iterator<String> getIterator() {
        if (length == -1) {
            init();
        } else {
            iter = fuzzStrs.iterator();
        }
        return iter;
    }

    public int getLength() {
        if (length == -1) {
            init();
        }
        return length;
    }

    public boolean hasNext() {
        if (length == -1) {
            init();
        }
        return iter.hasNext();
    }

    public String getFileName() {
        return this.file.getName();
    }
}
