package utils;

import dbProcs.Getter;
import dbProcs.Setter;
import java.sql.SQLException;
import java.time.LocalDateTime;
import org.apache.logging.log4j.LogManager;
import org.apache.logging.log4j.Logger;

/**
 * <br>
 * This file is part of the Security Shepherd Project.
 *
 * <p>The Security Shepherd project is free software: you can redistribute it and/or modify it under
 * the terms of the GNU General Public License as published by the Free Software Foundation, either
 * version 3 of the License, or (at your option) any later version.<br>
 *
 * <p>The Security Shepherd project is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
 * PURPOSE. See the GNU General Public License for more details.<br>
 *
 * <p>You should have received a copy of the GNU General Public License along with the Security
 * Shepherd project. If not, see <http://www.gnu.org/licenses/>.
 *
 * @author Mark Denihan
 */
public class CountdownHandler {

  private static final Logger log = LogManager.getLogger(CountdownHandler.class);

  private static LocalDateTime startTime;
  private static boolean hasStartTime = false;
  private static LocalDateTime lockTime;
  private static boolean hasLockTime = false;
  private static LocalDateTime endTime;
  private static boolean hasEndTime = false;

  private static boolean isLoaded = false;

  private static boolean validate() throws InvalidCountdownStateException {

    if (!isLoaded) {
      loadCountdowns();
    }

    if (hasStartTime && hasLockTime) {
      if (startTime.isAfter(lockTime)) {
        throw new InvalidCountdownStateException("Start time must be before or equal to lock time");
      }
    }

    if (hasStartTime && hasEndTime) {
      if (startTime.isAfter(endTime)) {
        throw new InvalidCountdownStateException("Start time must be before or equal to end time");
      }
    }

    if (hasLockTime && hasEndTime) {
      if (lockTime.isAfter(endTime)) {
        throw new InvalidCountdownStateException("Lock time must be before or equal to end time");
      }
    }

    return true;
  }

  public static boolean willStart() throws InvalidCountdownStateException {

    // Returns true if there is a start time but the CTF hasn't started yet

    validate();

    return hasStartTime() && !isRunning();
  }

  public static boolean willLock() throws InvalidCountdownStateException {

    // Returns true if CTF has started and there is a lock time that hasn't happened yet

    validate();

    return isStarted() && hasLockTime() && isOpen();
  }

  public static boolean willEnd() throws InvalidCountdownStateException {

    // Return true if CTF it is locked or started, has an end timer that hasn't happened yet

    validate();

    return !willLock() && isRunning() && hasEndTime() && !hasEnded();
  }

  public static boolean isOpen() throws InvalidCountdownStateException {

    // CTF is open if it has started, isn't locked and hasn't ended

    validate();

    return isStarted() && !isLocked() && !hasEnded();
  }

  public static boolean isRunning() throws InvalidCountdownStateException {

    // CTF is running if it has started, hasn't ended, but ignores lock state

    validate();

    return isStarted() && !hasEnded();
  }

  public static boolean isStarted() {
    if (!isLoaded) {
      loadCountdowns();
    }

    if (hasStartTime) {

      // Start timer enabled, only return true if timer has passed
      return startTime.isBefore(LocalDateTime.now());
    } else {

      // Start timer disabled, always say it's started
      return true;
    }
  }

  public static boolean isLocked() {
    if (!isLoaded) {
      loadCountdowns();
    }
    return hasLockTime && lockTime.isBefore(LocalDateTime.now());
  }

  public static boolean hasEnded() {
    if (!isLoaded) {
      loadCountdowns();
    }
    return hasEndTime && endTime.isBefore(LocalDateTime.now());
  }

  public static LocalDateTime getStartTime() {
    if (!isLoaded) {
      loadCountdowns();
    }
    return startTime;
  }

  public static boolean hasStartTime() {
    if (!isLoaded) {
      loadCountdowns();
    }
    return hasStartTime;
  }

  public static LocalDateTime getLockTime() {
    if (!isLoaded) {
      loadCountdowns();
    }
    return lockTime;
  }

  public static boolean hasLockTime() {
    if (!isLoaded) {
      loadCountdowns();
    }
    return hasLockTime;
  }

  public static LocalDateTime getEndTime() {
    if (!isLoaded) {
      loadCountdowns();
    }
    return endTime;
  }

  public static boolean hasEndTime() {
    if (!isLoaded) {
      loadCountdowns();
    }
    return hasEndTime;
  }

  public static void setStartTime(LocalDateTime theStartTime) {
    if (!isLoaded) {
      loadCountdowns();
    }

    hasStartTime = true;
    startTime = theStartTime;

    saveCountdowns();
  }

  public static void enableStartTime() {
    if (!isLoaded) {
      loadCountdowns();
    }

    hasStartTime = true;

    saveCountdowns();
  }

  public static void disableStartTime() {
    if (!isLoaded) {
      loadCountdowns();
    }

    hasStartTime = false;

    saveCountdowns();
  }

  public static void setLockTime(LocalDateTime theLockTime) {
    if (!isLoaded) {
      loadCountdowns();
    }

    hasLockTime = true;
    lockTime = theLockTime;

    saveCountdowns();
  }

  public static void enableLockTime() {
    if (!isLoaded) {
      loadCountdowns();
    }

    hasLockTime = true;

    saveCountdowns();
  }

  public static void disableLockTime() {
    if (!isLoaded) {
      loadCountdowns();
    }

    hasLockTime = false;

    saveCountdowns();
  }

  public static void setEndTime(LocalDateTime theEndTime) {
    if (!isLoaded) {
      loadCountdowns();
    }

    hasEndTime = true;
    endTime = theEndTime;

    saveCountdowns();
  }

  public static void enableEndTime() {
    if (!isLoaded) {
      loadCountdowns();
    }

    hasEndTime = true;

    saveCountdowns();
  }

  public static void disableEndTime() {
    if (!isLoaded) {
      loadCountdowns();
    }

    hasEndTime = false;

    saveCountdowns();
  }

  private static void saveCountdowns() {
    try {

      if (isLoaded) {

        Setter.setStartTime("", startTime);
        Setter.setStartTimeStatus("", hasStartTime);
        Setter.setLockTime("", lockTime);
        Setter.setLockTimeStatus("", hasLockTime);
        Setter.setEndTime("", endTime);
        Setter.setEndTimeStatus("", hasEndTime);
      }

    } catch (SQLException e) {
      log.fatal("Could not save countdown settings in database: " + e.toString());
      throw new RuntimeException(e);
    }
  }

  public static void forceReload() {
    isLoaded = false;
    loadCountdowns();
  }

  private static void loadCountdowns() {

    try {

      startTime = Getter.getStartTime("");
      hasStartTime = Getter.getStartTimeStatus("");
      lockTime = Getter.getLockTime("");
      hasLockTime = Getter.getLockTimeStatus("");
      endTime = Getter.getEndTime("");
      hasEndTime = Getter.getEndTimeStatus("");

    } catch (SQLException e) {
      log.fatal("Could not load module plan setting from database: " + e.toString());
      throw new RuntimeException(e);
    }

    isLoaded = true;
  }
}