using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using FlaxEngine;
using FidelityFX;

namespace Cabrito
{
	// Holds Console variables and commands to control engine behaviour
	public static class EngineSubsystem
	{
		[ConsoleSubsystemInitializer]
		public static void Initialize()
		{
		}

		[ConsoleCommand("quit", "exit")]
		public static void ExitCommand()
		{
			Engine.RequestExit();
		}

		[ConsoleCommand("debuglog")]
		public static void DebugLogCommand(string[] text)
		{
			Debug.Log(string.Join(" ", text));
		}

		// TODO: this should manually set all postprocessing values to 0 or disabled
		/*[ConsoleVariable("r_postprocessing")]
		public static string PostProcessing
		{
		    get
		    {
		        PostFxVolume postFx = Level.FindActor<PostFxVolume>();
		        if (postFx != null)
		            return postFx.CameraArtifacts.OverrideFlags.ToString();
		        return "";
		    }
		    set
		    {
		        bool valueBoolean = false;
		        if (int.TryParse(value, out int valueInt))
		            valueBoolean = valueInt != 0;
		        else
		            return;

		        PostFxVolume postFx = Level.FindActor<PostFxVolume>();
		        if (postFx != null)
		        {
		            var cameraArtifacts = postFx.CameraArtifacts;
		            cameraArtifacts.OverrideFlags = valueBoolean ? CameraArtifactsSettingsOverride.None : CameraArtifactsSettingsOverride.All;
		            postFx.CameraArtifacts = cameraArtifacts;
		        }
		    }
		}*/

		[ConsoleVariable("r_vignette")]
		public static string Vignette
		{
			get
			{
				PostFxVolume postFx = Level.FindActor<PostFxVolume>();
				if (postFx != null)
					return postFx.CameraArtifacts.VignetteIntensity.ToString();
				return "";
			}
			set
			{
				if (float.TryParse(value, out float valueFloat))
				{
					PostFxVolume postFx = Level.FindActor<PostFxVolume>();
					if (postFx != null)
					{
						valueFloat = Mathf.Clamp(valueFloat, 0.0f, 2.0f);

						var cameraArtifacts = postFx.CameraArtifacts;
						cameraArtifacts.VignetteIntensity = valueFloat;
						postFx.CameraArtifacts = cameraArtifacts;
					}
				}
			}
		}

		[ConsoleVariable("cl_maxfps")]
		public static string MaxFps
		{
			get { return Time.UpdateFPS.ToString(); }
			set
			{
				if (float.TryParse(value, out float valueFloat))
				{
					if (valueFloat <= 0.0f)
						valueFloat = 0.0f;
					else
						valueFloat = Mathf.Clamp(valueFloat, 10f, 99999999999.0f);

					if (Time.UpdateFPS != valueFloat)
						Time.UpdateFPS = valueFloat;
					if (Time.DrawFPS != valueFloat)
						Time.DrawFPS = valueFloat;
				}
			}
		}

		[ConsoleVariable("r_renderscale")]
		public static string RenderScale
		{
			get
			{
				return MainRenderTask.Instance.RenderingPercentage.ToString();
			}
			set
			{
				if (float.TryParse(value, out float valueFloat))
				{
					valueFloat = Mathf.Clamp(valueFloat, 0.00001f, 4.0f);
					MainRenderTask.Instance.RenderingPercentage = valueFloat;
				}
			}
		}

		private static FSR _fsrPlugin;
		public static FSR FsrPlugin
		{
			get
			{
				if (_fsrPlugin == null)
					_fsrPlugin = PluginManager.GetPlugin<FSR>();
				return _fsrPlugin;
			}
		}

		// TODO: r_upscaling
		[ConsoleVariable("r_fsr_enabled")]
		public static string FsrEnabled
		{
			get
			{
				return FsrPlugin.PostFx.Enabled ? "1" : "0";
			}
			set
			{
				bool boolValue = false;
				if (int.TryParse(value, out int intValue))
					boolValue = intValue != 0;
				else if (float.TryParse(value, out float valueFloat))
					boolValue = valueFloat != 0f;

				FsrPlugin.PostFx.Enabled = boolValue;
			}
		}

		[ConsoleVariable("r_fsr_sharpness")]
		public static string FsrSharpness
		{
			get
			{
				// In shader, the value of 0 is the max sharpness...
				float sharpness = 2.0f - FsrPlugin.PostFx.Sharpness;
				return sharpness.ToString();
			}
			set
			{
				if (float.TryParse(value, out float valueFloat))
				{
					valueFloat = Mathf.Clamp(valueFloat, 0f, 2.0f);
					FsrPlugin.PostFx.Sharpness = 2.0f - valueFloat;
				}
			}
		}

		[ConsoleVariable("cl_showweapon")]
		public static string ShowWeapon
		{
			get
			{
				return Level.FindActor("ViewModelCamera").IsActive ? "1" : "0";
			}
			set
			{
				bool boolValue = false;
				if (int.TryParse(value, out int intValue))
					boolValue = intValue != 0;
				else if (float.TryParse(value, out float valueFloat))
					boolValue = valueFloat != 0f;

				Level.FindActor("ViewModelCamera").IsActive = boolValue;
			}
		}


		// Horizontal field of view of the Camera
		[ConsoleVariable("fov")]
		public static string CameraFov
		{
			get
			{
				float valueFloat = Level.FindActor("PlayerCamera").As<Camera>().FieldOfView;
				float horizontalFov = (float)(180.0f / Math.PI * (2*Math.Atan((4f/3f) * Math.Tan(Math.PI / 180.0f * valueFloat / 2.0f))));
				return horizontalFov.ToString();
			}
			set
			{
				if (float.TryParse(value, out float valueFloat))
				{
					valueFloat = Mathf.Clamp(valueFloat, 0.01f, 360.0f);

					float verticalFov = (float)(180.0f / Math.PI * (2*Math.Atan((3f/4f) * Math.Tan(Math.PI / 180.0f * valueFloat / 2.0f))));
					Level.FindActor("PlayerCamera").As<Camera>().FieldOfView = verticalFov;
				}
			}
		}
	}
}