using UnityEngine;

[RequireComponent(typeof(Animator))]
public class IKControl_Robot : MonoBehaviour
{
    public bool ikActive;
    public Transform rightHandObj;
    public Transform leftHandObj;
    public Transform lookObj;
    public Transform stepOnObj;
    public Transform stepOffObj;

    protected Animator animator;


    private void Start()
    {
        animator = GetComponent<Animator>();
        transform.Rotate(0, 90, 0);
    }

    //a callback for calculating IK
    private void OnAnimatorIK()
    {
        if (animator)
        {
            //if the IK is active, set the position and rotation directly to the goal.
            if (ikActive)
            {
                // Set the look target position, if one has been assigned
                if (lookObj != null)
                {
                    animator.SetLookAtWeight(1);
                    animator.SetLookAtPosition(lookObj.position);
                }

                // Set the right hand target position and rotation, if one has been assigned
                if (rightHandObj != null)
                {
                    animator.SetIKPositionWeight(AvatarIKGoal.RightHand, 1);
                    animator.SetIKRotationWeight(AvatarIKGoal.RightHand, 1);
                    animator.SetIKPosition(AvatarIKGoal.RightHand, rightHandObj.position);
                    animator.SetIKRotation(AvatarIKGoal.RightHand, rightHandObj.rotation);
                }

                if (leftHandObj != null)
                {
                    animator.SetIKPositionWeight(AvatarIKGoal.LeftHand, 1);
                    animator.SetIKRotationWeight(AvatarIKGoal.LeftHand, 1);
                    animator.SetIKPosition(AvatarIKGoal.LeftHand, leftHandObj.position);
                    animator.SetIKRotation(AvatarIKGoal.LeftHand, leftHandObj.rotation);
                }

                if (stepOnObj != null)
                {
                    animator.SetIKPositionWeight(AvatarIKGoal.LeftFoot, 1);
                    animator.SetIKRotationWeight(AvatarIKGoal.LeftFoot, 1);
                    animator.SetIKPosition(AvatarIKGoal.LeftFoot, stepOnObj.position);
                    animator.SetIKRotation(AvatarIKGoal.LeftFoot, stepOnObj.rotation);
                }

                if (stepOffObj != null)
                {
                    animator.SetIKPositionWeight(AvatarIKGoal.RightFoot, 1);
                    animator.SetIKRotationWeight(AvatarIKGoal.RightFoot, 1);
                    animator.SetIKPosition(AvatarIKGoal.RightFoot, stepOffObj.position);
                    animator.SetIKRotation(AvatarIKGoal.RightFoot, stepOffObj.rotation);
                }
            }

            //if the IK is not active, set the position and rotation of the hand and head back to the original position
            else
            {
                animator.SetIKPositionWeight(AvatarIKGoal.RightHand, 0);
                animator.SetIKRotationWeight(AvatarIKGoal.RightHand, 0);
                animator.SetIKPositionWeight(AvatarIKGoal.LeftHand, 0);
                animator.SetIKRotationWeight(AvatarIKGoal.LeftHand, 0);

                animator.SetLookAtWeight(0);
                animator.SetIKPositionWeight(AvatarIKGoal.LeftFoot, 0);
                animator.SetIKRotationWeight(AvatarIKGoal.LeftFoot, 0);

                animator.SetIKPositionWeight(AvatarIKGoal.RightFoot, 0);
                animator.SetIKRotationWeight(AvatarIKGoal.RightFoot, 0);
            }
        }
    }
}