using UnityEngine;

public class ShipControls : MonoBehaviour {
    enum ModeSwitching { Start, Impulse, Acceleration, Force, VelocityChange };
    ModeSwitching m_ModeSwitching;

    Vector3 m_StartPos;
    Vector3 m_StartForce;
    Vector3 m_Thrust;
    float   m_thrustBase;
    float   m_stabliseMag;

    Rigidbody m_Rigidbody;

    public GameObject ship;
    public Camera camera;

    void Start() {
        m_Rigidbody = GetComponent<Rigidbody>();
        m_Thrust = new Vector3(0.0f, 0.0f, 0.0f);
        m_StartPos = camera.transform.position;
        m_StartForce = m_Rigidbody.transform.forward;
        m_thrustBase = 10.0f;
        m_stabliseMag = 75.0f;
        Cursor.lockState = CursorLockMode.Locked;
    }

    void Update() {
        // update the thrust vector every frame
        m_Thrust = camera.transform.forward;

        // do everything else input related on every frame too
        processInput();
    }

    void FixedUpdate() {
        float thrustMag = getThrustMagnitude();
        m_Rigidbody.AddForce(m_Thrust * thrustMag, ForceMode.Acceleration);


        // stablise ship towards camera position
        float step = m_stabliseMag * Time.fixedDeltaTime;
        m_Rigidbody.rotation = Quaternion.RotateTowards(transform.rotation, camera.transform.rotation, step);
    }

    float getThrustMagnitude() {
        if (Input.GetMouseButton(0))
            return 1.0f * m_thrustBase;

        if (Input.GetMouseButton(1))
            return -1.0f * m_thrustBase;

        return 0.0f;
    }

    void processInput() {
        if (Input.GetKey(KeyCode.Space))
            Respawn();
    }

    void Respawn() {
        m_Thrust = new Vector3(0.0f, 0.0f, 0.0f);
        transform.position = m_StartPos;
        m_Rigidbody.transform.forward = m_StartForce;
    }

    // {
    //     //If the current mode is not the starting mode (or the GameObject is not reset), the force can change
    //     if (m_ModeSwitching != ModeSwitching.Start)
    //     {
    //         //The force changes depending what you input into the text fields
    //         m_NewForce = camera.transform.position;
    //     }

    //     //Here, switching modes depend on button presses in the Game mode
    //     switch (m_ModeSwitching)
    //     {
    //         //This is the starting mode which resets the GameObject
    //         case ModeSwitching.Startt
    //             //This resets the GameObject and Rigidbody to their starting positions
    //             transform.position = m_StartPos;
    //             m_Rigidbody.transform.forward = m_StartForce;

    //             //This resets the velocity of the Rigidbody
    //             m_Rigidbody.velocity = new Vector3(0f, 0f, 0f);
    //             break;

    //         //These are the modes ForceMode can force on a Rigidbody
    //         //This is Acceleration mode
    //         case ModeSwitching.Acceleration:
    //             //Use Acceleration as the force on the Rigidbody
    //             break;

    //         //This is Force Mode, using a continuous force on the Rigidbody considering its mass
    //         case ModeSwitching.Force:

    //             //Use Force as the force on GameObject’s Rigidbody
    //             break;

    //         //This is Impulse Mode, which involves using the Rigidbody’s mass to apply an instant impulse force.
    //         case ModeSwitching.Impulse:
    //             //Use Impulse as the force on GameObject
    //             break;

    //         //This is VelocityChange which involves ignoring the mass of the GameObject and impacting it with a sudden speed change in a direction
    //         case ModeSwitching.VelocityChange:
    //             //Make a Velocity change on the Rigidbody
    //             break;
    //     }
    // }

    //The function outputs buttons, text fields, and other interactable UI elements to the Scene in Game view
    // void OnGUI()
    // {
    //     //Press the button to reset the GameObject and Rigidbody
    //     if (GUI.Button(new Rect(100, 0, 150, 30), "Reset"))
    //     {
    //         //This switches to the start/reset case
    //         m_ModeSwitching = ModeSwitching.Start;
    //     }

    //     //When you press the Acceleration button, switch to Acceleration mode
    //     if (GUI.Button(new Rect(100, 30, 150, 30), "Apply Acceleration"))
    //     {
    //         //Switch to Acceleration (apply acceleration force to GameObject)
    //         m_ModeSwitching = ModeSwitching.Acceleration;
    //     }

    //     //If you press the Impulse button
    //     if (GUI.Button(new Rect(100, 60, 150, 30), "Apply Impulse"))
    //     {
    //         //Switch to impulse (apply impulse forces to GameObject)
    //         m_ModeSwitching = ModeSwitching.Impulse;
    //     }

    //     //If you press the Force Button, switch to Force state
    //     if (GUI.Button(new Rect(100, 90, 150, 30), "Apply Force"))
    //     {
    //         //Switch to Force (apply force to GameObject)
    //         m_ModeSwitching = ModeSwitching.Force;
    //     }

    //     //Press the button to switch to VelocityChange state
    //     if (GUI.Button(new Rect(100, 120, 150, 30), "Apply Velocity Change"))
    //     {
    //         //Switch to velocity changing
    //         m_ModeSwitching = ModeSwitching.VelocityChange;
    //     }
    // }
}