using System;
using System.Linq;
using System.Collections;
using System.Threading.Tasks;
using System.Collections.Generic;

using UnityEngine;
using UnityEngine.Events;
using UnityEngine.SceneManagement;

public class SceneHandler : MonoBehaviour
{
    [SerializeField] Material skyboxMaterial;
    [SerializeField] float startPositionValue;
    [SerializeField] float endPositionValue;
    [Space]
    [SerializeField] GameObject[] disableOnStart;
    public UnityEvent OnSceneLoaded;

    async Task Start()
    {
        foreach(var item in disableOnStart)
            item.SetActive(false);

        var skyboxExposure = 1;
        float currentExposure = 0;

        if(skyboxMaterial != null)
            skyboxMaterial.SetFloat("_Exposure", 0);

        float currentPositionValue = startPositionValue;

        var objectsOnScene = FindObjectsOfType<MeshRenderer>();
        List<Material> materialsWithEffect = new();

        foreach(var item in objectsOnScene)
        {
            foreach(var material in item.sharedMaterials)
            {
                if(material.shader.name.Contains("S_Holographic") ||
                    material.shader.name.Contains("S_Terrain"))
                        materialsWithEffect.Add(material);
            }
        }

        foreach(var item in materialsWithEffect)
            item.SetFloat("_EffectPosition", startPositionValue);

        while(currentPositionValue != endPositionValue)
        {
            currentPositionValue = Mathf.MoveTowards(currentPositionValue,
                endPositionValue,
                Time.deltaTime * 3);

            foreach(var item in materialsWithEffect)
                item.SetFloat("_EffectPosition",
                    currentPositionValue);
            
            await Task.Yield();
        }

        if(skyboxMaterial != null)
        {
            while(currentExposure != skyboxExposure)
            {
                currentExposure = Mathf.MoveTowards(currentExposure, skyboxExposure, Time.deltaTime);
                skyboxMaterial.SetFloat("_Exposure", currentExposure);

                await Task.Yield();
            }
        }

        foreach(var item in disableOnStart)
            item.SetActive(true);

        OnSceneLoaded?.Invoke();
    }
}