package server;

import java.io.*;
import java.util.regex.Pattern;



/**
 * @author Piotr Kawa
 * @since 09.06.2017
 */

class FileHandler {


    int option;
    private final Pattern PATTERN = Pattern.compile("^[a-zA-Z0-9_/.]+$");
    String searchedFile;
    File file;


    public FileHandler(){}

    /**
     * Method converts .html file to a String in order to create a response.
     * @param fileName - path to a file that will be converted
     * @return content - HTML file converted to a String
     * */

    String prepareFileForSending(String fileName){

        String content;
        StringBuilder responseBodyBuilder = new StringBuilder();

        try {

            BufferedReader fileToConvert = new BufferedReader(new FileReader(fileName));
            String line;

            while ((line = fileToConvert.readLine()) != null) {
                responseBodyBuilder.append(line);
            }

            fileToConvert.close();

        } catch (IOException e) {
            e.printStackTrace();
        }

        content = responseBodyBuilder.toString();

        return content;
    }

    /**
     *  Method checks whether requested file is valid, there are 3 acceptable options
     *  1) "/"            - requests index from root directory
     *  2) "/abc"         - requests abc file from root directory
     *  3) "/abc/"        - requests index from abc directory
     *
     *  @return true    - requested file is valid, otherwise false
     *
     * */

    public boolean validateRequestedFile(String requestedFile){


        System.out.println("REQUEST = " + requestedFile);
        int length = requestedFile.length()-1;


        String second = requestedFile.substring(1);



        if (requestedFile.compareTo("/") == 0){
            option = 1;
            return true;
        } else if(requestedFile.charAt(0) == '/' && PATTERN.matcher(second).matches() && requestedFile.charAt(length) != '/'){
            option = 2;
            return true;
        } else if(requestedFile.charAt(0) == '/' && PATTERN.matcher(second).matches() && requestedFile.charAt(length) == '/'){
            option = 3;
            return true;
        } else {
            return false;
        }
//        option = 2;
//        return true;
    }

    /**
     * Method that searches for a given file.
     * @param requestedFile - given file, if it contains a '/' at the end - look for a index file in a suitable subdirectory, othwerwise
     *                         look for a given file in root directory
     * @return true if a file is found
     * */

    public boolean serverContainsFile(String requestedFile) throws Exception{



        int length = requestedFile.length()-1;
        String second = requestedFile.substring(1);
        String path;

        /*TODO: somenthing wrong with slashes*/
        /*TODO: implement using RegEx*/

        if(option == 1){
            //searched file is index in root directory
            searchedFile = "index.html";
            file = new File("D:\\PIOTR\\PROGRAMOWANIE\\sem4\\SIECI\\lista5\\SiteContent\\" + searchedFile);

//            System.out.println(searchedFile);

        } else if(option == 2){

            searchedFile = requestedFile.substring(1);
            //searched file is index in subdirectory
            file = new File("D:\\PIOTR\\PROGRAMOWANIE\\sem4\\SIECI\\lista5\\SiteContent\\" + searchedFile);

//            System.out.println("looking for " + searchedFile);

        } else if (option == 3) {

            //erase '/' from requested file
            path = requestedFile.substring(1,length);
            StringBuffer abc = new StringBuffer(path);
            abc.append("\\");

            System.out.println("abc = " + abc);
            file = new File("D:\\PIOTR\\PROGRAMOWANIE\\sem4\\SIECI\\lista5\\SiteContent\\" + abc);

            searchedFile = "index";

//            System.out.println(searchedFile);

        } else {
            throw new Exception("Error while processing file!");
        }

        return file.exists();
    }

    public String getRequestedFilePath(){
        return file.toString();
    }
}