using System.Collections;
using System.Collections.Generic;
using UnityEngine;
public class importHoudiniRBD : MonoBehaviour {
    static void attachCollider(Transform renderXform, Transform colliderXform){
        GameObject colObj = colliderXform.gameObject;
        GameObject renderObj = renderXform.gameObject;
        //print("Attaching collider: " + colObj.name);
        MeshCollider collider= colObj.AddComponent<MeshCollider>(); //add collider
        collider.convex = true;
        colliderXform.SetParent(renderXform);
        MeshRenderer colRend = colliderXform.GetComponent<MeshRenderer>();
        colRend.enabled = false;
        //check if allready processed
        if (null==renderObj.GetComponent<Rigidbody>())
        {
            renderObj.AddComponent<Rigidbody>();
        }
    }
    static int getChildIndexByName(Transform parent, string name, int numChildren)
    {
        int i =-1;
        for (int ii = 0; ii < numChildren; ii++)
        {
            string currentName = parent.GetChild(ii).name;
            //print(nameSplit[0]);
            if (currentName.Contains(name+'_'))//'_' and a suffix int is added to the Houdini name
            {
                return ii; //found the correct i for current piece
            }
        }
        return i;
    }
    public float test = 0;
    // Adds a sphere collider to all children that doesn't have a collider
    void Start()
    {
        //print("init" + this.gameObject.name);
        //print("Components: " + this.gameObject.GetComponents(typeof(GameObject)));
        Transform houObjNode = this.gameObject.transform;
        int nChildren = houObjNode.childCount; //keep track of number of children as this number gets obsolete as we parent objects 
        print (nChildren);
        int i = 0;
        int j = 0;
        int k = 0;
        
        //List<string> pieces = new List<string>();
        List<string> colliders = new List<string>();
        //get all pieces to attach
        foreach (Transform childXform in houObjNode)
        {
            //if (j > houObjNode.childCount) { continue; } //safety break
            if (childXform.name.Contains("Collider")) { colliders.Add(childXform.name); }
            //else { pieces.Add(childXform.name); }
        }
        
        foreach (string colliderName in colliders)
        {
            k++;
            if (k > 1000) { break;} //safety break
            i = -1;
            j = -1;
            string[] nameSplit = colliderName.Split(new string[] { "Collider" }, System.StringSplitOptions.None);
            string renderObjName = nameSplit[0];
            nameSplit = colliderName.Split(new string[] { "Collider" }, System.StringSplitOptions.None);
            
            //get transform indices
            i = getChildIndexByName(houObjNode, renderObjName, nChildren);
            //check if we found render piece
            if (i < 0)
            {
                Debug.LogError("Couldn't find render mesh: " + renderObjName);
                //print("i:" + i +", j:" + j);
                break;
            }
            
            j = getChildIndexByName(houObjNode, colliderName.Split('_')[0], nChildren);
            if (j < 0) {
                Debug.LogError("Can't process " + colliderName);
            }
            else {
                Transform renderXform = houObjNode.GetChild(i);
                Transform colXform = houObjNode.GetChild(j);
                attachCollider(renderXform, colXform);
                //print("Render object: " + renderXform);
                nChildren--; //reduce loop size
            }
        }
    }
}