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

public class SelectDrag : MonoBehaviour
{
    public GameObject O;
    bool drag = false;
    GameObject Oclone;

    public void Select() {
        if (O.name.IndexOf("_") == -1 )
        {
            GameObject Oc = Instantiate(O);
            Oc.name = O.name + "_" + _G.OBJnum;
            _G.OBJnum += 1;
            Oc.transform.SetParent(Get.o2("Canvas", "OBSTACLELIST").transform, false);
            Oc.transform.localPosition = O.transform.localPosition;
            //Oc.tag = "C1";
            //Oc.transform.Find("icon").tag = "C2";
            _G.SELECTED=Oc.name;
            startDrag(Oc);
        }
        else
        {
            _G.SELECTED=name;
            print("_G.SELECTED="+_G.SELECTED);
            O=Get.o1(_G.SELECTED);
            if (_G.PNL != "POSITIONING")startDrag(O);
            if (_G.PNL == "POSITIONING") {RepositionPNL.StartPNL(O.name, O);}
        }
     }

    public void startDrag(GameObject Oc) {
        print("O.name="+Oc.name);

        foreach (Transform go in Get.o2("Canvas", "OBSTACLELIST").transform)
        {
            go.gameObject.GetComponent<SelectDrag>().enabled = false;
        }
        Oc.gameObject.GetComponent<SelectDrag>().enabled = true;
        foreach (Transform child in Oc.transform)
            if (child.name.StartsWith("T_")) child.gameObject.SetActive(false);
        DELETE.HideButtons();
        Oclone = Oc;
        drag = true;
        int On=int.Parse(_G.SELECTED.Split("_")[1]);
        _G.OBJs[On] = null;
     }

    public void stopDrag() {
        foreach (Transform go in Get.o2("Canvas", "OBSTACLELIST").transform)
        {
            go.tag = "Obstacle";
        }
        drag = false;
        if (_G.PNL != "POSITIONING")Oclone.transform.Find("Image").gameObject.SetActive(false);
        float posY = Input.mousePosition.y / Screen.height;
        if (_G.PNL != "POSITIONING")Oclone.transform.Find("Circle").GetComponent<Image>().color = new Color(1f, 0f, 0f, 0f);

        if (posY <= 0.1f || posY >= 0.9f) {Discard(); }
        if(_G.PNL=="OBSTACLES"){
            RepositionPNL.CheckWallHit(Oclone,"OBSTACLES");
            if (!IsInsidePlan(Oclone))
            { Discard(); return; }
            if(_G.WallSELECTED=="floor" && Oclone.name.IndexOf("DOOR")!=-1){Discard(); }
            else if(_G.WallSELECTED=="floor" && Oclone.name.IndexOf("WIND")!=-1){Discard(); }
            else if(_G.WallSELECTED=="floor" && Oclone.name.IndexOf("OPEN")!=-1){Discard(); }
            else if(_G.WallSELECTED=="floor" && Oclone.name.IndexOf("PATI")!=-1){Discard(); }
            else if(_G.WallSELECTED=="floor" && Oclone.name.IndexOf("PLUM")!=-1){Discard(); }
            else if(_G.WallSELECTED=="floor" && Oclone.name.IndexOf("GAZ")!=-1){Discard(); }
            else if(_G.WallSELECTED=="floor" && Oclone.name.IndexOf("DOOR")!=-1){Discard(); }
        }
        DELETE.Refresh();// contour vert + corbeille sur l'objet qui vient d'etre pose
     }

    // Le depot est refuse : l'objet disparait, donc plus rien n'est selectionne.
    void Discard() {
        Destroy(Oclone);
        _G.SELECTED = "";
        DELETE.Refresh();
     }

    void Update()
        {
            if (drag == true)
            {
                if (Input.GetMouseButtonUp(0)) { stopDrag(); return; }
                if(Oclone!=null){
                    Oclone.transform.position = Input.mousePosition;
                    if(_G.PNL=="OBSTACLES")RepositionPNL.CheckWallHit(Oclone,"OBSTACLES");
                    }
            }
        }

    public void DeSelecttWall()
    {
        if (_G.PNL == "OBSTACLES")
        {
            foreach(Transform Wall in  Get.o2("OBSTACLES","Plan").transform )
            {
                Wall.transform.GetComponent<Image>().color=Color.black;
            }
        }
    }

    static bool IsInsidePlan(GameObject obj)
    {
        Vector3[] c = new Vector3[4];
        Bounds allWalls = new(Vector3.zero, Vector3.zero);
        bool hasWalls = false;
        for (int i = 1; i <= _G.NW; i++)
        {
            GameObject wall = Get.o3("OBSTACLES", "Plan", "w" + i);
            if (wall == null) continue;
            wall.GetComponent<RectTransform>().GetWorldCorners(c);
            if (!hasWalls) { allWalls = new(c[0], Vector3.zero); hasWalls = true; }
            for (int j = 0; j < 4; j++) allWalls.Encapsulate(c[j]);
        }
        if (!hasWalls) return true;

        obj.GetComponent<RectTransform>().GetWorldCorners(c);
        Bounds objB = new(c[0], Vector3.zero);
        for (int i = 1; i < 4; i++) objB.Encapsulate(c[i]);

        return allWalls.Intersects(objB);
    }

    void OnTriggerEnter(Collider hit)
        {
            if (hit.gameObject.CompareTag("Obstacle"))
            {
                drag = false;
            }
        }

    void OnTriggerExit(Collider hit)
        {
            if (hit.gameObject.CompareTag("Obstacle"))
            {
                drag = true;
            }
        }
}