import java.io.BufferedReader;
import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileReader;
import java.io.FileWriter;
import java.io.IOException;
import java.io.InputStreamReader;
import java.util.ArrayList;
import java.util.List;

import javax.swing.JFileChooser;


class ProfanityChecker{
    //to store badwords
    List<String> badWords;
    
    //constructor will read the badwors file and add to
    //badwords list
    public ProfanityChecker(String s) {
        FileReader f;
        try {
            f = new FileReader(s);
            BufferedReader bw=new BufferedReader(f);
            badWords=new ArrayList<String>();
            String str;
            while((str=bw.readLine())!=null){
                badWords.add(str);
            }
            bw.close();
        } catch (FileNotFoundException e) {
            System.out.println("bad words file not found error");
        }catch(IOException e){

        }
    }

    //run method to run the program
    void run(){
        BufferedReader bf=new BufferedReader(new InputStreamReader(System.in));
        //loop will continue until user exits
        while(true){
            System.out.println("1.Enter a sentence for profanity check ");
            System.out.println("2.Choose a file for profanity check ");
            System.out.println("3.exit");
            int option;
            try {
                option = Integer.parseInt(bf.readLine());

                if(option==1){
                    //reading from user input and replace the badwords
                    System.out.println("Enter text : ");
                    String words=bf.readLine();

                    for(String badWord:badWords){
                        words=words.replaceAll(badWord, "***");
                    }
                    System.out.println(words);
                }else if(option==2){
                    //choosing the text file
                    JFileChooser j=new JFileChooser();
                    while(true){
                        //this loop will continue until user selects text file or cancel
                        int r=j.showOpenDialog(null);
                        File f=null;
                        if(r==JFileChooser.APPROVE_OPTION){

                            f= j.getSelectedFile();
                            if(!f.getName().endsWith("txt")){
                                System.out.println("invalid file try choose again");
                                continue;
                            }
                            
                            BufferedReader bw=new BufferedReader(new FileReader(f));
                            String line;
                            String newContent="";
                            while((line=bw.readLine())!=null){
                                newContent+=line+System.lineSeparator();
                            }
                            for(String badWord:badWords){
                                newContent=newContent.replaceAll(badWord, "***");
                            }
                            FileWriter fw=new FileWriter(f);
                            fw.write(newContent);
                            fw.close();
                            bw.close();

                        }else{
                            break;
                        }
                        if(f!=null)
                            break;

                    }System.out.println("File modified");
                }else if(option == 3 ){
                    //terminate the program
                    System.out.println("Good bye");
                    System.exit(0);
                }
                else{
                    throw new NumberFormatException();
                }
            } catch (NumberFormatException e) {
                System.out.println("Invalid input");

            } catch (IOException e) {
                System.out.println("File not found");
            }
        }
    }

}