using System.Collections;
using System.Collections.Generic;
using UnityEngine;

public class PlayerMovementMouse : MonoBehaviour, IPlayerMovement
{
    // Indicates the maximum distance to the ground
    [SerializeField]
    private float groundMaxDistance = 500f;

    // indicates the name of the layer mask to detect (layer masks are used to identify colliders of interest when casting a ray), we are interested in if the player is clicking the ground
    // See more: https://docs.unity3d.com/ScriptReference/LayerMask.html
    [SerializeField]
    private string groundTargetLayerMask = "Floor";

    // The destination Point indicated by mouse click
    Vector3 destinationPosition = Vector3.zero;

    private bool isMoving;

    private float speed;

    public Vector3 GetMovement(float walkSpeed, float runSpeedMultiplier, float rotateSpeed)
    {
        isMoving = false;
        speed = walkSpeed;

        //If user is pressing left mouse button, proess movement, otherwise return zero movement
        if (Input.GetMouseButton(0))
        {
            RaycastHit hit;

            // Cast a ray and check if the ray hits the ground layer mask collider
            // Set the destination to the point hit
            LayerMask layerMask = LayerMask.GetMask(groundTargetLayerMask);

            if (Physics.Raycast(Camera.main.ScreenPointToRay(Input.mousePosition), out hit, groundMaxDistance, layerMask.value))
            {
                destinationPosition = hit.point;
            }


            // Get offset to destination position
            Vector3 deltaTargetPosition = destinationPosition - transform.position;

            // Calculate short destination (Current position + 2) to move this frame in the direction of the destination position, keeping y the same
            Vector3 destinationDirection = transform.position + deltaTargetPosition.normalized * 2.0f;


            // Rotate character in direction of the destination direction
            // First read and store the original rotation, so you can gradually rotate the character to the new direction using the Quaternion.Slerp method
            Quaternion originalRotation = transform.rotation;

            // Rotate the character's transform forward in the direction of the destination (
            transform.LookAt(destinationDirection);

            // Now gradually rotate character in world space from current rotation to new rotation after looking at target
            transform.rotation = Quaternion.Slerp(originalRotation, transform.rotation, rotateSpeed * Time.deltaTime);

            isMoving = true;
            return destinationDirection;
        } else        
        {
            return Vector3.zero;
        }
    }

    private void OnAnimatorMove()
    {
        // https://docs.unity3d.com/Manual/ScriptingRootMotion.html
        // Have to manualy update the position because of "in-place" humanoid animations (moving on the spot)
        
        if (isMoving)
        {
            transform.position = Vector3.MoveTowards(transform.position, destinationPosition, speed * Time.deltaTime);
        }
    }

}