/*
   Simple .RDP file parser

   Copyright 2013 Blaz Bacnik

   This Source Code Form is subject to the terms of the Mozilla Public License, v. 2.0. 
   If a copy of the MPL was not distributed with this file, You can obtain one at http://mozilla.org/MPL/2.0/.
*/

package com.freerdp.freerdpcore.utils;

import java.io.BufferedReader;
import java.io.FileReader;
import java.io.IOException;
import java.util.HashMap;
import java.util.Locale;

public class RDPFileParser {

    private static final int MAX_ERRORS = 20;
    private static final int MAX_LINES = 500;

    private HashMap<String, Object> options;

    public RDPFileParser() {
        init();
    }

    public RDPFileParser(String filename) throws IOException {
        init();
        parse(filename);
    }

    private void init() {
        options = new HashMap<String, Object>();
    }

    public void parse(String filename) throws IOException {
        BufferedReader br = new BufferedReader(new FileReader(filename));
        String line = null;

        int errors = 0;
        int lines = 0;
        boolean ok;

        while ((line = br.readLine()) != null) {
            lines++;
            ok = false;

            if (errors > MAX_ERRORS || lines > MAX_LINES) {
                br.close();
                throw new IOException("Parsing limits exceeded");
            }

            String[] fields = line.split(":", 3);

            if (fields.length == 3) {
                if (fields[1].equals("s")) {
                    options.put(fields[0].toLowerCase(Locale.ENGLISH), fields[2]);
                    ok = true;
                } else if (fields[1].equals("i")) {
                    try {
                        Integer i = Integer.parseInt(fields[2]);
                        options.put(fields[0].toLowerCase(Locale.ENGLISH), i);
                        ok = true;
                    } catch (NumberFormatException e) {
                    }
                } else if (fields[1].equals("b")) {
                    ok = true;
                }
            }

            if (!ok) errors++;
        }
        br.close();
    }

    public String getString(String optionName) {
        if (options.get(optionName) instanceof String)
            return (String) options.get(optionName);
        else
            return null;
    }

    public Integer getInteger(String optionName) {
        if (options.get(optionName) instanceof Integer)
            return (Integer) options.get(optionName);
        else
            return null;
    }
}