using System;
using UnityEngine;
using UnityEngine.Rendering;
using UnityEngine.Rendering.Universal;
using Object = System.Object;

namespace BoatAttack
{
    [ExecuteAlways]
    public class AppSettings : MonoBehaviour
    {
        public enum RenderRes
        {
            _Native,
            _1440p,
            _1080p,
            _720p
        }

        public enum Framerate
        {
            _30,
            _60,
            _120
        }

        [Header("Resolution Settings")]
        public RenderRes maxRenderSize = RenderRes._720p;
        public bool variableResolution = false;
        [Range(0f, 1f)]
        public float axisBias = 0.5f;
        public float minScale = 0.5f;
        public Framerate targetFramerate = Framerate._30;
        private float currentDynamicScale = 1.0f;
        private float maxScale = 1.0f;

        [Header("Quality Level Settings")] 
        public Volume qualityVolume;

        public VolumeProfile[] qualityVolumeProfiles = new VolumeProfile[3];
        private int qualityLevel;
        
        // Use this for initialization
        void OnEnable()
        {
            Initialize();
            RenderPipelineManager.beginCameraRendering += SetRenderScale;
        }

        void Initialize()
        {
            Application.targetFrameRate = 300;
            qualityLevel = QualitySettings.GetQualityLevel();
            qualityVolume.profile = qualityVolumeProfiles[qualityLevel];
        }

        private void Start()
        {
            var obj = GameObject.Find("[Debug Updater]");
            if(obj != null)
                Destroy(obj);
        }

        private void OnDisable()
        {
            RenderPipelineManager.beginCameraRendering -= SetRenderScale;
        }

        void SetRenderScale(ScriptableRenderContext context, Camera camera)
        {
            float res;
            switch (maxRenderSize)
            {
                case RenderRes._720p:
                    res = 1280f;
                    break;
                case RenderRes._1080p:
                    res = 1920f;
                    break;
                case RenderRes._1440p:
                    res = 2560f;
                    break;
                default:
                    res = camera.pixelWidth;
                    break;
            }

            var renderScale = Mathf.Clamp(res / camera.pixelWidth, 0.1f, 1.0f);
            maxScale = renderScale;
            UniversalRenderPipeline.asset.renderScale = renderScale;
        }

        void UpdateQualitySettings(int level)
        {
            qualityLevel = level;
            qualityVolume.profile = qualityVolumeProfiles[level];
        }

        private void Update()
        {
            var level = QualitySettings.GetQualityLevel();
            if(level != qualityLevel)
                UpdateQualitySettings(level);
            
            if (variableResolution)
            {
                Camera.main.allowDynamicResolution = true;

                var offset = 0f;
                var currentFrametime = Time.deltaTime;
                var rate = 0.1f;

                switch (targetFramerate)
                {
                    case Framerate._30:
                        offset = currentFrametime > (1000f / 30f) ? -rate : rate;
                        break;
                    case Framerate._60:
                        offset = currentFrametime > (1000f / 30f) ? -rate : rate;
                        break;
                    case Framerate._120:
                        offset = currentFrametime > (1000f / 120f) ? -rate : rate;
                        break;
                }

                currentDynamicScale = Mathf.Clamp(currentFrametime + offset, minScale, 1f);
                
                var offsetVec = new Vector2(Mathf.Lerp(1, currentDynamicScale, Mathf.Clamp01((1 - axisBias) * 2f)),
                    Mathf.Lerp(1, currentDynamicScale, Mathf.Clamp01(axisBias * 2f)));

                ScalableBufferManager.ResizeBuffers(offsetVec.x, offsetVec.y);
            }
            else
            {
                Camera.main.allowDynamicResolution = false;
            }
        }

        public void ToggleSRPBatcher(bool enabled)
        {
            UniversalRenderPipeline.asset.useSRPBatcher = enabled;
        }
    }
}