import java.util.List;
import java.util.ArrayList;
import java.io.File;
import java.io.BufferedReader;
import java.io.FileReader;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.lang.NumberFormatException;
import java.io.Writer;
import java.io.BufferedWriter;
import java.io.OutputStreamWriter;
import java.io.FileOutputStream;

//This class defines a player for the game.
public class Player
{
    private String name, surname, username, password; //encapsulated data
    private int gamesPlayed, totalScore;

    private static final String PLAYER_FILE_NAME = "player_data.csv"; // name of file storing player data

    public Player() //no-argument constructor method
    {
        this.name = "NOT SET";
        this.surname = "NOT SET";
        this.username = "NOT SET";
        this.password = "NOT SET";
        this.gamesPlayed = -1;
        this.totalScore = -1; //INITIAL VALUE FOR A PROPERLY DEFINED VALUE IS 0. SO FOR A NON-DEFINED I WILL SET IT AS -1.
    }

    //constructor with all arguments
    public Player (String name, String surname, String username, String password, int gamesPlayed, int totalScore)
    {
        this.name = name;
        this.surname = surname;
        this.username = username;
        this.password= password;
        this.gamesPlayed = gamesPlayed;
        this.totalScore = totalScore;
    }

        public Player (Player aPlayer) //copy constructor method
    {
        this.name = aPlayer.name;
        this.surname = aPlayer.surname;
        this.username = aPlayer.username;
        this.password= aPlayer.password;
        this.gamesPlayed = aPlayer.gamesPlayed;
        this.totalScore = aPlayer.totalScore;
    }

    //A series of getter methods
    public String getName()
    {
        return name;     //Returns the player's name
    }

    public String getSurname()
    {
        return surname;     //Returns the player's surname
    }

    public String getUsername()
    {
        return username;     //Returns the player's unique username
    }

    public String getPassword()
    {
        return password;     //Returns the player's password
    }

    public int getGamesPlayed()
    {
        return gamesPlayed;    //Returns the number of games played of the player
    }

    public int getTotalScore()
    {
        return totalScore;     //Returns the total score of the player
    }

    // set gamesPlayed to a new value
    public void setGamesPlayed(int gamesPlayed)
    {
        this.gamesPlayed = gamesPlayed;
    }

    // set totalScore to a new value
    public void setTotalScore(int totalScore)
    {
        this.totalScore = totalScore;
    }

    //a series of setter methods for debugging use
    //(game does not allow user to amend these values)
    public void setName(String theName)
    {
        if (!InputValidation.nameValidation(theName))
        {
            System.out.print("\n    The name has not been changed.");
        }
        else
        {
            this.name = theName;
        }
    }

    public void setSurname(String theSurname)
    {
        if (!InputValidation.nameValidation(theSurname))
        {
            System.out.print("\n    The surname has not been changed.");
        }
        else
        {
            this.surname = theSurname;
        }
    }

    public void setUsername(String theUsername)
    {
        if (!InputValidation.usernameValidation(theUsername))
        {
            System.out.print("\n    The username has not been changed.");
        }
        else
        {
            this.username = theUsername;
        }
    }

    public void setPassword(String thePassword)
    {
        if (!InputValidation.passwordValidation(thePassword))
        {
            System.out.print("\n    The password has not been changed.");
        }
        else
        {
            this.password = thePassword;
        }
    }

    // string representation of player, useful for writing to file and for debugging
    public String toString()
    {
        return name + "," + surname + "," + username + "," + password + "," + gamesPlayed + "," + totalScore;
    }

    // parses players file, constructs a Player from each line and returns constructed Players
    public static List<Player> readPlayersFromFile()
    {
        // create player file if it doesn't exist
        File playerFile = new File(Player.PLAYER_FILE_NAME);
        try
        {
            playerFile.createNewFile(); // does nothing if file already exists
        } catch (IOException e)
        {
            e.printStackTrace();
            System.exit(1); // exit
        }

        BufferedReader br = null;
        try
        {
            br = new BufferedReader(new FileReader(Player.PLAYER_FILE_NAME));
            List<Player> players = new ArrayList<Player>();
            String line = "";
            while ((line = br.readLine()) != null) // read lines until end of file
            {
                String[] fields = line.split(","); // split line by ","
                int parsedGamesPlayed = Integer.parseInt(fields[4]); // parse gamesPlayed from string
                int parsedTotalScore = Integer.parseInt(fields[5]); // parse totalScore from string
                Player p = new Player(fields[0], fields[1], fields[2], fields[3], parsedGamesPlayed, parsedTotalScore);
                players.add(p);
            }
            return players;
        } catch (FileNotFoundException e)
        {
            e.printStackTrace();
            System.exit(1); // exit
        } catch (IOException e)
        {
            e.printStackTrace();
            System.exit(1); // exit
        } catch (NumberFormatException e)
        {
            e.printStackTrace();
            System.exit(1); // exit
        } finally
        {
            if (br != null)
            {
                try
                {
                    br.close(); // close file if it was opened
                } catch (IOException e)
                {
                    e.printStackTrace();
                }
            }
        }
        return null; // unreachable
    }

    // writes list of players to file, one line per player
    public static void writePlayersToFile(List<Player> players)
    {
        Writer writer = null;
        try
        {
            writer = new BufferedWriter(new OutputStreamWriter(new FileOutputStream(Player.PLAYER_FILE_NAME), "utf-8"));
            for (Player p: players)
            {
                writer.write(p.toString()); // write string representation of player, which contains all player attributes
                writer.write("\n"); // write new line to move cursor to the next line
            }
        } catch (IOException e)
        {
            e.printStackTrace();
        } finally
        {
            if (writer != null)
            {
                try
                {
                    writer.close(); // close file if it was opened
                } catch (IOException e)
                {
                    e.printStackTrace();
                }
            }
        }
    }

}