using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using SHINT.UI;
using WI;
using UnityEngine.Rendering;
using System.Linq;

namespace SHINT
{
    [DefaultExecutionOrder(int.MinValue+1)]
    public class NameTagManager : MonoBehaviour, ISingle
    {
        UI_NameTag nameTag_Prefab;
        public Camera cam;

        List<UI_NameTag> nameTags = new();
        List<Facility> facilities = new();
        public float defaultNameHeight;
        public float nameTagMaxScale;
        public float nameTagMinScale;

        public void GenerateNameTags(FacilityManager fm)
        {
            OrbitalController controller = FindSingle<OrbitalController>();
            cam = controller.camera;
            nameTag_Prefab = Resources.Load<UI_NameTag>("Prefabs/PRF_UI_NameTag");

            facilities = fm.FacilityList();

            foreach (Facility facility in facilities)
            {
                UI_NameTag newNameTag = Instantiate(nameTag_Prefab, transform);
                nameTags.Add(newNameTag);
                newNameTag.Initialize();
                newNameTag.ShowData(facility);
                newNameTag.isTagActivate = true;
                facility.SetNameTag(newNameTag);
            }
        }

        private void Start()
        {
            GraphicsSettings.transparencySortMode = TransparencySortMode.Perspective;
        }

        private void Update()
        {
            SettingPos();
            SettingScale();
            SortbyCamera();
        }

        void SettingPos()
        {
            foreach (Facility facility in facilities)
            {
                Vector3 screenPos = cam.WorldToScreenPoint(new Vector3(facility.centerPos.x, facility.height + defaultNameHeight, facility.centerPos.z));
                if (screenPos.z > 0)
                {
                    facility.nameTag.transform.position = screenPos;
                }
            }
        }

        void SettingScale()
        {
            foreach (Facility facility in facilities)
            {
                float distance = Vector3.Distance(cam.transform.position, facility.centerPos);
                float scale = Mathf.Clamp(6f / distance, nameTagMinScale, nameTagMaxScale);
                facility.nameTag.myScale = scale;
                if (facility.nameTag.isTagActivate)
                {
                    facility.nameTag.transform.localScale = new Vector3(scale, scale, scale);
                }
            }
        }

        void SortbyCamera()
        {
            //nameTags.Sort((a, b) => Vector3.Distance(a.transform.position, cam.transform.position)
            //      .CompareTo(Vector3.Distance(b.transform.position, cam.transform.position)));

            //nameTags.Reverse();

            nameTags = nameTags
                .OrderByDescending(n => Vector3.Distance(n.transform.position, cam.transform.position)).ToList();
            for (int i = 0; i < nameTags.Count; i++)
            {
                nameTags[i].transform.SetSiblingIndex(i);
            }
        }

        public void ActiveNameTags_Animation()
        {
            foreach(UI_NameTag tags in nameTags)
            {
                tags.Activate_Animation();
            }
        }
        public void ActiveNameTags_NonAnimation()
        {
            foreach (UI_NameTag tags in nameTags)
            {
                tags.Activate_NonAnimation();
            }
        }
    }
}