2023WayOfTheRobot/src/main/java/frc4388/robot/subsystems/SwerveDrive.java

// Copyright (c) FIRST and other WPILib contributors.
// Open Source Software; you can modify and/or share it under the terms of
// the WPILib BSD license file in the root directory of this project.

package frc4388.robot.subsystems;

import com.ctre.phoenix.sensors.WPI_Pigeon2;

import edu.wpi.first.math.geometry.Rotation2d;
import edu.wpi.first.math.geometry.Translation2d;
import edu.wpi.first.math.kinematics.ChassisSpeeds;
import edu.wpi.first.math.kinematics.SwerveDriveKinematics;
import edu.wpi.first.math.kinematics.SwerveModuleState;
import edu.wpi.first.math.trajectory.constraint.SwerveDriveKinematicsConstraint;
import edu.wpi.first.math.util.Units;
import edu.wpi.first.wpilibj2.command.SubsystemBase;
import frc4388.robot.Constants.SwerveDriveConstants;
import frc4388.utility.RobotGyro;

public class SwerveDrive extends SubsystemBase {
  
  private SwerveModule leftFront;
  private SwerveModule rightFront;
  private SwerveModule leftBack;
  private SwerveModule rightBack;

  private SwerveModule[] modules;

  private Translation2d leftFrontLocation = new Translation2d(Units.inchesToMeters(SwerveDriveConstants.HALF_HEIGHT), Units.inchesToMeters(SwerveDriveConstants.HALF_WIDTH));
  private Translation2d rightFrontLocation = new Translation2d(Units.inchesToMeters(SwerveDriveConstants.HALF_HEIGHT), -Units.inchesToMeters(SwerveDriveConstants.HALF_WIDTH));
  private Translation2d leftBackLocation = new Translation2d(-Units.inchesToMeters(SwerveDriveConstants.HALF_HEIGHT), Units.inchesToMeters(SwerveDriveConstants.HALF_WIDTH));
  private Translation2d rightBackLocation = new Translation2d(-Units.inchesToMeters(SwerveDriveConstants.HALF_HEIGHT), -Units.inchesToMeters(SwerveDriveConstants.HALF_WIDTH));
  
  private SwerveDriveKinematics kinematics = new SwerveDriveKinematics(leftFrontLocation, rightFrontLocation, leftBackLocation, rightBackLocation); 
  
  private WPI_Pigeon2 gyro;

  /** Creates a new SwerveDrive. */
  public SwerveDrive(SwerveModule leftFront, SwerveModule rightFront, SwerveModule leftBack, SwerveModule rightBack, WPI_Pigeon2 gyro) {
    this.leftFront = leftFront;
    this.rightFront = rightFront;
    this.leftBack = leftBack;
    this.rightBack = rightBack;

    this.modules = new SwerveModule[] {leftFront, rightFront, leftBack, rightBack};

    this.gyro = gyro;
  }

  public void driveWithInput(double xSpeed, double ySpeed, double rot, boolean fieldRelative) {
    double xSpeedMetersPerSecond = xSpeed * SwerveDriveConstants.Conversions.JOYSTICK_TO_METERS_PER_SECOND;
    double ySpeedMetersPerSecond = ySpeed * SwerveDriveConstants.Conversions.JOYSTICK_TO_METERS_PER_SECOND;

    SwerveModuleState[] states = kinematics.toSwerveModuleStates(
      fieldRelative ? ChassisSpeeds.fromFieldRelativeSpeeds(xSpeedMetersPerSecond, ySpeedMetersPerSecond, rot, gyro.getRotation2d()) 
                    : new ChassisSpeeds(xSpeedMetersPerSecond, ySpeedMetersPerSecond, rot)
    );

    SwerveDriveKinematics.desaturateWheelSpeeds(states, Units.metersToFeet(SwerveDriveConstants.MAX_SPEED_FEET_PER_SECOND));
    setModuleStates(states);
  }

  /**
   * Set each module of the swerve drive to the corresponding desired state.
   * @param desiredStates Array of module states to set.
   */
  public void setModuleStates(SwerveModuleState[] desiredStates) {
    for (int i = 0; i < desiredStates.length; i++) {
      SwerveModule module = modules[i];
      SwerveModuleState state = desiredStates[i];
      module.setDesiredState(state);
    }
  }

  @Override
  public void periodic() {
    // This method will be called once per scheduler run
  }
}