/**
 * HockeyStats.java
 *
 * <p>The main driver class for the Hockey Stats Manager. Handles user input, file I/O operations,
 * and menu navigation.
 *
 * @author Cody Trainer
 */
import java.io.*;
import java.util.*;

public class HockeyStats {
  static PlayerList players = new PlayerList();
  static BufferedReader br;
  static StringTokenizer st;
  static Scanner s = new Scanner(System.in);

  /**
   * Runs the primary menu loop.
   *
   * @param args Command line arguments (not used).
   * @throws Exception If file reading or input errors occur.
   */
  public static void main(String[] args) throws Exception {
    while (true) {
      if (showMenu()) break;
    }
    s.close();
  }

  /**
   * Loads player data from a specified text file.
   *
   * @param fileName The name of the file to load from.
   * @throws Exception If the file is not found or is improperly formatted.
   */
  public static void loadData(String fileName) throws Exception {
    players.clear();
    File f = new File(fileName);
    br = new BufferedReader(new FileReader(f));
    st = new StringTokenizer(br.readLine());
    int n = Integer.parseInt(st.nextToken());
    for (int i = 0; i < n; i++) {
      st = new StringTokenizer(br.readLine());
      players.addPlayer(
          new HockeyPlayer(
              st.nextToken() + " " + st.nextToken(), // first + last name
              Integer.parseInt(st.nextToken()), // goals
              Integer.parseInt(st.nextToken()), // assists
              Integer.parseInt(st.nextToken()), // gamesWon
              Integer.parseInt(st.nextToken()))); // gamesLost
    }
    br.close();
  }

  /**
   * Saves current player list data to a specified text file.
   *
   * @param fileName The name of the file to save to.
   * @throws Exception If an I/O error occurs.
   */
  public static void saveData(String fileName) throws Exception {
    FileWriter fw = new FileWriter(fileName);
    String save = players.createSaveData();
    fw.write(save);
    fw.close();
    System.out.println("Data saved to " + fileName);
  }

  /**
   * Displays the main menu and routes user to various sub-menus or actions.
   *
   * @return true if the user chooses to quit, false otherwise.
   * @throws Exception If input errors occur.
   */
  public static boolean showMenu() throws Exception {
    System.out.print(
        """
          <---------------------------->
            Hockey Stats Manager Menu

           Select an option:

          (1) Load Data from Files
          (2) Save Data
          (3) Open Data Editor
          (4) Open Stats View Menu
          (5) Quit

          <---------------------------->
        """);
    int n;
    try {
      n = s.nextInt();
      s.nextLine();
    } catch (Exception e) {
      System.out.println("Please choose one of the available menu options!");
      return false;
    }
    boolean close = false;
    switch (n) {
      case 1:
        loadData("data.txt");
        break;
      case 2:
        saveData("save.txt");
        break;
      case 3:
        while (true) {
          if (showDataMenu()) break;
        }
        break;
      case 4:
        while (true) {
          if (showStatsMenu()) break;
        }
        break;
      case 5:
        System.out.println("Thank you!");
        close = true;
        break;
      default:
        System.out.println("Please choose one of the available menu options!");
        break;
    }
    return close;
  }

  /**
   * Displays the editor menu for adding, removing, or updating player data.
   *
   * @return true if the user chooses to return to the main menu, false otherwise.
   * @throws Exception If input errors occur.
   */
  public static boolean showDataMenu() throws Exception {
    System.out.print(
        """
        <---------------------------->
          Hockey Data Editor Menu

         Select an option:

        (1) Add Player
        (2) Remove Player
        (3) Add Game to Player
        (4) Return to main menu

        <---------------------------->
        """);
    boolean dataExit = false;
    int k;
    try {
      k = s.nextInt();
      s.nextLine();
    } catch (Exception e) {
      System.out.println("Please choose one of the available menu options!");
      return false;
    }
    try {
      switch (k) {
        case 1:
          System.out.println("Enter The Following Stats:");
          System.out.println("\nPlayer Name:");
          String newName = s.nextLine();
          System.out.println("Player Goals Scored:");
          int newGoals = s.nextInt();
          System.out.println("Player Assists:");
          int newAssists = s.nextInt();
          System.out.println("Games Won:");
          int newGamesWon = s.nextInt();
          System.out.println("Games Lost:");
          int newGamesLost = s.nextInt();
          s.nextLine();
          players.addPlayer(
              new HockeyPlayer(newName, newGoals, newAssists, newGamesWon, newGamesLost));
          break;
        case 2:
          System.out.println("Enter the name of the player you want to remove:");
          String rmName = s.nextLine();
          System.out.println(
              players.removePlayer(rmName)
                  ? rmName + " was successfully removed."
                  : "Player not found.");
          break;
        case 3:
          System.out.println("Enter The Following Stats:");
          System.out.println("\nPlayer Name:");
          String addName = s.nextLine();
          System.out.println("Player Goals Scored:");
          int addGoals = s.nextInt();
          System.out.println("Player Assists:");
          int addAssists = s.nextInt();
          s.nextLine();
          System.out.println("Games Won? (yes/no)");
          boolean addGameWon = s.nextLine().equalsIgnoreCase("yes");
          HockeyPlayer found = players.findPlayer(addName);
          if (found == null) {
            System.out.println("Player not found.");
          } else {
            found.addGame(addGoals, addAssists, addGameWon);
          }
          break;
        case 4:
          dataExit = true;
          break;
        default:
          System.out.println("Please choose one of the available menu options!");
          break;
      }
    } catch (Exception e) {
      System.out.println("Please enter the right kind of data");
    }
    return dataExit;
  }

  /**
   * Displays the viewer menu for printing, finding, and sorting player statistics.
   *
   * @return true if the user chooses to return to the main menu, false otherwise.
   */
  public static boolean showStatsMenu() {
    System.out.print(
        """
          <---------------------------->
            Hockey Stats Viewer

           Select an option:

          (1) Print Data
          (2) Find Player
          (3) Sort By Name
          (4) Sort By Points
          (5) Show by Goals > num
          (6) Return to Main Menu

          <---------------------------->
        """);
    boolean statsExit = false;
    int k;
    try {
      k = s.nextInt();
      s.nextLine();
    } catch (Exception e) {
      System.out.println("Please choose one of the available menu options!");
      return false;
    }
    try {
      switch (k) {
        case 1:
          System.out.println(players.toString());
          break;
        case 2:
          System.out.println("Enter the name of the player you want to find:");
          String findName = s.nextLine();
          HockeyPlayer p = players.findPlayer(findName);
          System.out.println(p == null ? "Player not found." : p.toString());
          break;
        case 3:
          players.sortByNames();
          System.out.println("Sorted by names");
          break;
        case 4:
          players.sortByPoints();
          System.out.println("Sorted by points");
          break;
        case 5:
          System.out.println("Enter the min goals to show:");
          int minGoals = s.nextInt();
          s.nextLine();
          PlayerList pl = players.getPlayersGoalsAbove(minGoals);
          System.out.println(pl.toString());
          break;
        case 6:
          statsExit = true;
          break;
        default:
          System.out.println("Please choose one of the available menu options!");
          break;
      }
    } catch (Exception e) {
      System.out.println("k = " + k);
      System.out.println(e);
      System.out.println("Please enter the right kind of data");
    }
    return statsExit;
  }
}