/*----------------------------------------------------------------------------*/
/* Copyright (c) 2008-2018 FIRST. All Rights Reserved.                        */
/* Open Source Software - may be modified and shared by FRC teams. The code   */
/* must be accompanied by the FIRST BSD license file in the root directory of */
/* the project.                                                               */
/*----------------------------------------------------------------------------*/

package edu.wpi.first.wpilibj;

import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.net.URL;
import java.util.Enumeration;
import java.util.jar.Manifest;

import edu.wpi.cscore.CameraServerJNI;
import edu.wpi.first.networktables.NetworkTableInstance;
import edu.wpi.first.wpilibj.hal.FRCNetComm.tInstances;
import edu.wpi.first.wpilibj.hal.FRCNetComm.tResourceType;
import edu.wpi.first.wpilibj.hal.HAL;
import edu.wpi.first.wpilibj.hal.HALUtil;
import edu.wpi.first.wpilibj.internal.HardwareHLUsageReporting;
import edu.wpi.first.wpilibj.internal.HardwareTimer;
import edu.wpi.first.wpilibj.livewindow.LiveWindow;
import edu.wpi.first.wpilibj.util.WPILibVersion;

/**
 * Implement a Robot Program framework. The RobotBase class is intended to be subclassed by a user
 * creating a robot program. Overridden autonomous() and operatorControl() methods are called at the
 * appropriate time as the match proceeds. In the current implementation, the Autonomous code will
 * run to completion before the OperatorControl code could start. In the future the Autonomous code
 * might be spawned as a task, then killed at the end of the Autonomous period.
 */
public abstract class RobotBase {
  /**
   * The VxWorks priority that robot code should work at (so Java code should run at).
   */
  public static final int ROBOT_TASK_PRIORITY = 101;

  /**
   * The ID of the main Java thread.
   */
  // This is usually 1, but it is best to make sure
  public static final long MAIN_THREAD_ID = Thread.currentThread().getId();

  protected final DriverStation m_ds;

  /**
   * Constructor for a generic robot program. User code should be placed in the constructor that
   * runs before the Autonomous or Operator Control period starts. The constructor will run to
   * completion before Autonomous is entered.
   *
   * <p>This must be used to ensure that the communications code starts. In the future it would be
   * nice
   * to put this code into it's own task that loads on boot so ensure that it runs.
   */
  protected RobotBase() {
    NetworkTableInstance inst = NetworkTableInstance.getDefault();
    inst.setNetworkIdentity("Robot");
    inst.startServer("/home/lvuser/networktables.ini");
    m_ds = DriverStation.getInstance();
    inst.getTable("LiveWindow").getSubTable(".status").getEntry("LW Enabled").setBoolean(false);

    LiveWindow.setEnabled(false);
  }

  /**
   * Free the resources for a RobotBase class.
   */
  public void free() {
  }

  /**
   * Get if the robot is a simulation.
   *
   * @return If the robot is running in simulation.
   */
  public static boolean isSimulation() {
    return !isReal();
  }

  /**
   * Get if the robot is real.
   *
   * @return If the robot is running in the real world.
   */
  public static boolean isReal() {
    return HALUtil.getHALRuntimeType() == 0;
  }

  /**
   * Determine if the Robot is currently disabled.
   *
   * @return True if the Robot is currently disabled by the field controls.
   */
  public boolean isDisabled() {
    return m_ds.isDisabled();
  }

  /**
   * Determine if the Robot is currently enabled.
   *
   * @return True if the Robot is currently enabled by the field controls.
   */
  public boolean isEnabled() {
    return m_ds.isEnabled();
  }

  /**
   * Determine if the robot is currently in Autonomous mode as determined by the field
   * controls.
   *
   * @return True if the robot is currently operating Autonomously.
   */
  public boolean isAutonomous() {
    return m_ds.isAutonomous();
  }

  /**
   * Determine if the robot is currently in Test mode as determined by the driver
   * station.
   *
   * @return True if the robot is currently operating in Test mode.
   */
  public boolean isTest() {
    return m_ds.isTest();
  }

  /**
   * Determine if the robot is currently in Operator Control mode as determined by the field
   * controls.
   *
   * @return True if the robot is currently operating in Tele-Op mode.
   */
  public boolean isOperatorControl() {
    return m_ds.isOperatorControl();
  }

  /**
   * Indicates if new data is available from the driver station.
   *
   * @return Has new data arrived over the network since the last time this function was called?
   */
  public boolean isNewDataAvailable() {
    return m_ds.isNewControlData();
  }

  /**
   * Provide an alternate "main loop" via startCompetition().
   */
  public abstract void startCompetition();

  @SuppressWarnings("JavadocMethod")
  public static boolean getBooleanProperty(String name, boolean defaultValue) {
    String propVal = System.getProperty(name);
    if (propVal == null) {
      return defaultValue;
    }
    if (propVal.equalsIgnoreCase("false")) {
      return false;
    } else if (propVal.equalsIgnoreCase("true")) {
      return true;
    } else {
      throw new IllegalStateException(propVal);
    }
  }

  /**
   * Common initialization for all robot programs.
   */
  public static void initializeHardwareConfiguration() {
    if (!HAL.initialize(500, 0)) {
      throw new IllegalStateException("Failed to initialize. Terminating");
    }

    // Set some implementations so that the static methods work properly
    Timer.SetImplementation(new HardwareTimer());
    HLUsageReporting.SetImplementation(new HardwareHLUsageReporting());
    RobotState.SetImplementation(DriverStation.getInstance());

    // Call a CameraServer JNI function to force OpenCV native library loading
    // Needed because all the OpenCV JNI functions don't have built in loading
    CameraServerJNI.enumerateSinks();
  }

  /**
   * Starting point for the applications.
   */
  @SuppressWarnings("PMD.UnusedFormalParameter")
  public static void main(String... args) {
    initializeHardwareConfiguration();

    HAL.report(tResourceType.kResourceType_Language, tInstances.kLanguage_Java);

    String robotName = "";
    Enumeration<URL> resources = null;
    try {
      resources = RobotBase.class.getClassLoader().getResources("META-INF/MANIFEST.MF");
    } catch (IOException ex) {
      ex.printStackTrace();
    }
    while (resources != null && resources.hasMoreElements()) {
      try {
        Manifest manifest = new Manifest(resources.nextElement().openStream());
        robotName = manifest.getMainAttributes().getValue("Robot-Class");
      } catch (IOException ex) {
        ex.printStackTrace();
      }
    }

    System.out.println("********** Robot program starting **********");

    RobotBase robot;
    try {
      robot = (RobotBase) Class.forName(robotName).newInstance();
    } catch (Throwable throwable) {
      Throwable cause = throwable.getCause();
      if (cause != null) {
        throwable = cause;
      }
      DriverStation.reportError("Unhandled exception instantiating robot " + robotName + " "
          + throwable.toString(), throwable.getStackTrace());
      DriverStation.reportWarning("Robots should not quit, but yours did!", false);
      DriverStation.reportError("Could not instantiate robot " + robotName + "!", false);
      System.exit(1);
      return;
    }

    try {
      final File file = new File("/tmp/frc_versions/FRC_Lib_Version.ini");

      if (file.exists()) {
        file.delete();
      }

      file.createNewFile();

      try (FileOutputStream output = new FileOutputStream(file)) {
        output.write("Java ".getBytes());
        output.write(WPILibVersion.Version.getBytes());
      }

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

    boolean errorOnExit = false;
    try {
      robot.startCompetition();
    } catch (Throwable throwable) {
      Throwable cause = throwable.getCause();
      if (cause != null) {
        throwable = cause;
      }
      DriverStation.reportError("Unhandled exception: " + throwable.toString(),
          throwable.getStackTrace());
      errorOnExit = true;
    } finally {
      // startCompetition never returns unless exception occurs....
      DriverStation.reportWarning("Robots should not quit, but yours did!", false);
      if (errorOnExit) {
        DriverStation.reportError(
            "The startCompetition() method (or methods called by it) should have "
                + "handled the exception above.", false);
      } else {
        DriverStation.reportError("Unexpected return from startCompetition() method.", false);
      }
    }
    System.exit(1);
  }
}