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

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

    public class SceneController : Singleton<SceneController>
    {
        public State state = State.Standby;

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

        [SerializeField]
        UniformBlendedStructuredBuffer uniform;

        //[SerializeField]
        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;

        [SerializeField]
        BlendedCosineGradient cosineGradient;

        [SerializeField]
        KinectOpticalFlow kinect;
        [SerializeField]
        float nightKinectAmount = 30.0f;

        [SerializeField]
        ParticleViewerProcedural particleViewer;
        [SerializeField, Range(0, 1)]
        float dayParticleRate = 1.0f;
        
        List<CharacterBehaviour> characters;

        [SerializeField]
        List<CharacterBehaviour> dayCharacters = new List<CharacterBehaviour>();

        [SerializeField]
        List<CharacterBehaviour> nightCharacters = new List<CharacterBehaviour>();

        
        float target_rate = 0.0f;


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

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

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

        private void Update()
        {
            if (mode)
            {
                if (Time.time - stamp > 10.0f)
                {
                    stamp = Time.time;
                    target_rate = 1.0f - target_rate;
                }
            }

            if (state == State.Standby)
            {
                target_rate = 0.0f;
                if (Input.GetKeyDown(KeyCode.PageDown))
                {
                    state = State.Day;
                    onSceneDay.Invoke();
                }
            }
            else if (state == State.Day)
            {
                target_rate = 0.0f;
                if (Input.GetKeyDown(KeyCode.PageUp))
                {
                    state = State.Standby;
                    onSceneStandby.Invoke();
                }
                else if (Input.GetKeyDown(KeyCode.PageDown))
                {
                    state = State.Night;
                    onSceneNight.Invoke();
                }
            }
            else if (state == State.Night)
            {
                target_rate = 1.0f;
                if (Input.GetKeyDown(KeyCode.PageUp))
                {
                    state = State.Standby;
                    onSceneStandby.Invoke();
                }
                else if (Input.GetKeyDown(KeyCode.PageDown))
                {
                    state = State.Day;
                    onSceneDay.Invoke();
                }
            }

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


            uniform.rate = rate;
            foreach (var mat in spaceMaterials)
                mat.SetFloat("_Rate", rate);
            //snowMaterial.SetFloat("_Size", Mathf.Lerp(0.0f, snowSize, rate));
            snowMaterial.SetFloat("_Size", Mathf.Lerp(daySnowSize, nightSnowSize, rate));
            cosineGradient.rate = rate;
            kinect.kinectAmount = Mathf.Lerp(1.0f, nightKinectAmount, rate);
            particleViewer.VertexCount = (int)(Mathf.Lerp(dayParticleRate, 1.0f, rate) * particleViewer.buffer.count);

#if false
            foreach (var chr in dayCharacters)
            {
                chr.gameObject.SetActive(rate < 0.5);
            }

            foreach (var chr in nightCharacters)
            {
                chr.gameObject.SetActive(rate > 0.5);
            }
#else
            foreach (var chr in characters)
            {
                chr.Active = chr.appearSataes.Contains(state);
            }
#endif
        }
    }
}