using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using UnityEngine.Events;
using UltraCombos.Utility;

namespace UltraCombos.Frozen
{
    public enum State
    {
        Standby,
        Day,
        Night,
    }

    public class SceneController : Singleton<SceneController>
    {
        public State state = State.Standby;
        public float standbyTime = 10.0f;

        [Range(0, 1)]
        public float rate = 0.0f;

        public List<Material> spaceMaterials = new List<Material>();

        [SerializeField, Range(0.0f, 0.1f)]
        float daySnowSize = 0.01f;
        [SerializeField, Range(0.0f, 0.1f)]
        float nightSnowSize = 0.01f;
        [SerializeField]
        Material snowMaterial;

        List<CharacterBehaviour> characters;

        float target_rate = 0.0f;

        public UnityEvent onSceneStandby = new UnityEvent();
        public UnityEvent onSceneDay = new UnityEvent();
        public UnityEvent onSceneNight = new UnityEvent();

        [SerializeField, Header("Debug")]
        float stamp = 0.0f;

        private void Start()
        {
            var cbs = FindObjectsOfType<CharacterBehaviour>();
            characters = new List<CharacterBehaviour>(cbs);
        }

        private void Update()
        {
            if (standbyTime > 0.0f)
            {
                if (state == State.Standby)
                {
                    if (Time.time - stamp > standbyTime)
                    {
                        stamp = Time.time;
                        GoDay();
                    }
                }
            }

            if (state == State.Standby)
            {
                target_rate = 0.0f;
            }
            else if (state == State.Day)
            {
                target_rate = 0.0f;
            }
            else if (state == State.Night)
            {
                target_rate = 1.0f;
            }

            rate = Mathf.Lerp(rate, target_rate, 0.02f);

            foreach (var mat in spaceMaterials)
                mat.SetFloat("_Rate", rate);

            snowMaterial.SetFloat("_Size", Mathf.Lerp(daySnowSize, nightSnowSize, rate));

            foreach (var chr in characters)
            {
                chr.Active = chr.appearSataes.List.Contains(state);
            }
        }

        public void GoStandby()
        {
            state = State.Standby;
            onSceneStandby.Invoke();
            stamp = Time.time;
        }

        public void GoDay()
        {
            state = State.Day;
            onSceneDay.Invoke();
        }

        public void GoNight()
        {
            state = State.Night;
            onSceneNight.Invoke();
        }
    }
}