using System.Collections;
using UnityEngine;
using static UnityEngine.GraphicsBuffer;

public class PlayerController : MonoBehaviour
{
    public GameObject DougBody;
    public Shovel Shovel;
    public float walkSpeed;

    float digTime = 0.9f;
    float digTimestamp = 0;
    bool isDigging = false;

    Interactable nearestInteractable;
    private CharacterController characterController;
    private CameraController cameraController;
    private Vector3 moveDir;
    private float gravity = 10;

    private float camTargetRotation = 0;
    private bool isCamRotating = false;
    
    // Start is called once before the first execution of Update after the MonoBehaviour is created
    void Start()
    {
        characterController = GetComponent<CharacterController>();
        cameraController = GetComponent<CameraController>();
    }

    // Update is called once per frame
    void Update()
    {
        if (!isDigging)
        {
            RotatePlayerTowardMouse();
            TryInteract();
        }

        Walk();
        DigDetector();

        // TODO: This is just for testing, remove or clean up if used
        if (Input.GetKeyDown(KeyCode.LeftShift))
        {
            RotateCam();
        }

        HandleCamRotation();
    }

    void Walk()
    {
        float verticalMovement = 0;
        float horizontalMovement = 0;

        if (!isDigging)
        {
            verticalMovement = Input.GetAxisRaw("Vertical");
            horizontalMovement = Input.GetAxisRaw("Horizontal");
        }

        moveDir = new Vector3(horizontalMovement, 0, verticalMovement).normalized;

        if (cameraController != null)
        {
            // re-matrix the rotation direction so movement is consistent no matter what
            // the camera rotation is

            Matrix4x4 matrix = Matrix4x4.Rotate(Quaternion.Euler(0, cameraController.playerCamHome.rotation.eulerAngles.y, 0));
            moveDir = matrix.MultiplyPoint3x4(moveDir);
        }

        moveDir *= walkSpeed;

        if (!characterController.isGrounded)
        {
            moveDir.y = -gravity;
        }

        characterController.Move(moveDir * Time.deltaTime);
    }

    void DigDetector()
    {
        if (!isDigging)
        {
            if (Input.GetMouseButtonDown(0))
            {
                Shovel.Dig();
                isDigging = true;
                digTimestamp = Time.time + digTime; // fuck coroutines fr fr
            }
        }
        else
        {
            if (Time.time > digTimestamp)
            {
                isDigging = false;
            }
        }
    } 

    void RotatePlayerTowardMouse()
    {
        Ray ray = Camera.main.ScreenPointToRay(Input.mousePosition);
        RaycastHit hit;

        if (Physics.Raycast(ray, out hit, Mathf.Infinity))
        {
            Vector3 targetPosition = hit.point;
            targetPosition.y = transform.position.y; 

            Vector3 direction = targetPosition - transform.position;
            Quaternion targetRotation = Quaternion.LookRotation(direction, Vector3.up);

            DougBody.transform.rotation = targetRotation;
        }
    }

    void TryInteract()
    {
        if (Input.GetKeyDown(KeyCode.E) && nearestInteractable != null)
        {
            nearestInteractable.Interact();
        }
    }

    private void OnTriggerEnter(Collider other)
    {
        Interactable interactable = other.GetComponent<Interactable>();

        // store nearest interactable if it exists
        if (interactable != null)
        {
            nearestInteractable = interactable;
            interactable.MoveInsideRange();
        }
    }

    private void OnTriggerExit(Collider other)
    {
        // just null out interactables when we leave an interactable trigger (we cant and shouldn't overlap interactables)
        Interactable interactable = other.GetComponent<Interactable>();

        // store nearest interactable if it exists
        if (interactable != null && nearestInteractable != null)
        {
            nearestInteractable.MoveOutsideRange();
            nearestInteractable = null;
        }
    }

    void RotateCam()
    {
        if (!isCamRotating)
        {
            float currentY = cameraController.playerCamHome.transform.rotation.eulerAngles.y;
            camTargetRotation = currentY + 90f;
            isCamRotating = true;
        }
    }

    void HandleCamRotation()
    {
        float currentY = cameraController.playerCamHome.transform.rotation.eulerAngles.y;

        float step = 200 * Time.deltaTime;

        float newY = Mathf.MoveTowardsAngle(currentY, camTargetRotation, step);

        cameraController.playerCamHome.RotateAround(
            transform.position,
            Vector3.up,
            newY - currentY
        );

        if (Mathf.Abs(Mathf.DeltaAngle(newY, camTargetRotation)) < 0.01f)
        {
            isCamRotating = false;
        }
    }
}