using UnityEngine;

namespace Helpers
{
    public static class InterferenceTransformer 
    {
        /// <summary>
        /// Fits an object perfectly to the size of a container. The object wont surpass the container in any axis and will
        /// be the same size on at least one axis. 
        /// </summary>
        /// <param name="objectToFit">The object that will be rescaled</param>
        /// <param name="container">The container to which the object will be fitted</param>
        public static void ScaleObject(GameObject objectToFit, GameObject container){
            // compute the real scale of the object and container. the real scale is the scale in respect to the root game
            // object (instead of to the parent object)
            var realObjectScale = Vector3.Scale(objectToFit.transform.lossyScale, objectToFit.GetComponent<MeshFilter>().mesh.bounds.size);
            var realContainerScale = Vector3.Scale(container.transform.lossyScale, container.GetComponent<MeshFilter>().mesh.bounds.size);
        
            // compute the smallest ratio between object and container scale 
            var ratio = Mathf.Min(
                realContainerScale.x / realObjectScale.x, 
                realContainerScale.y / realObjectScale.y, 
                realContainerScale.z / realObjectScale.z);

            // use the ratio to modify the local scale
            objectToFit.transform.localScale *= ratio;
        }

        public static void FloorObject(GameObject objectToFloor, GameObject container)
        {
            var delta = (objectToFloor.GetComponent<MeshRenderer>().bounds.min - container.GetComponent<MeshRenderer>().bounds.min);
            delta.x = 0;
            delta.z = 0;
            objectToFloor.transform.position -= delta;
        }
    }
}