using BepInEx;
using BepInEx.Configuration;
using System;
using UnityEngine;
using EFT;

namespace UniformAim
{
    [BepInPlugin("com.greg.tarkovuniformaim", "Uniform Aim for Tarkov", "1.0.0")]
    [BepInProcess("EscapeFromTarkov.exe")]

    public class Plugin : BaseUnityPlugin
    {
        //Bepinex.Configurator fields
        public static ConfigEntry<int> configFOV;
        public static ConfigEntry<int> configCoeff;
        public static ConfigEntry<int> configSens;
        public static ConfigEntry<bool> configOverride;

        //TODO: figure out a way to read game settings to default the configFOV.Value to whatever the player has already set
        //TODO: figure out a way to read game settings to apply configSens.Value as a multiplier on top of Tarkov's stock sensitivity setting

        public static float mySens = 1f;

        //sight data for hacky workarounds
        public static int SelectedScope = 0;
        public static int SelectedScopeMode = 0;
        public static bool isAiming = false;

        //human-friendly names for variables used later
        float FPSCameraFOV = 50f;
        float ScopeFOV = 50f;
        float currentFOV = 50f;

        //Return aspect ratio based on game window resolution, currently unused but could be useful in the future
        float GetAspectRatio()
        {
            string screenWidth = Screen.width.ToString();
            string screenHeight = Screen.height.ToString();
            float resX = Convert.ToUInt16(screenWidth);
            float resY = Convert.ToUInt16(screenHeight);

            //Logger.LogInfo("GetAspectRatio(): resX: " + resX + " resY: " + resY);
            return (resX / resY);
        }
        //calculate horizontal FOV based on vertical FOV, currently unused but could be useful in the future
        float CalculateHFOV(float FOV)
        {
            float vFOVRad = FOV * Mathf.Deg2Rad;
            float hFOVRad = (float)(2 * Math.Atan(Math.Tan(FOV / 2) * Mathf.Deg2Rad) * GetAspectRatio());

            return (float)(Math.Round(hFOVRad * Mathf.Rad2Deg));
        }
        //calculate sensitivity based on FOV difference and coefficient
        float CalculateSensitivity(float aimedFOV, float hipFOV, float mySens)
        {   //clamp to avoid invalid values
            aimedFOV = Mathf.Clamp(aimedFOV, 0.1f, 90f);
            hipFOV = Mathf.Clamp(hipFOV, 0.1f, 90f);

            //convert to radians
            aimedFOV = aimedFOV * Mathf.Deg2Rad;
            hipFOV = hipFOV * Mathf.Deg2Rad;

            float exponent = (float)(100f / configCoeff.Value);

            float tanRatio = (float)(Math.Tan(aimedFOV / 2) / Math.Tan(hipFOV / 2));

            float sensitivity = (float)(configSens.Value/100f);
  
            float result = (float)Math.Pow(tanRatio, exponent) * sensitivity;

            return result;
        }

        //used to determine if the player is looking through the scope
        bool isScopeCameraActive()
        {
            if (Camera.allCamerasCount > 1) { return Camera.allCameras[1].GetComponent<Behaviour>().isActiveAndEnabled; }
            return false;
        }

        //used to determine the correct FOV for calculations
        void DetermineCurrentFOV()
        {
            if (!isScopeCameraActive())
            {
                currentFOV = FPSCameraFOV;
            }
            else
            {
                if (SelectedScope == 0) { currentFOV = ScopeFOV;}
                if (SelectedScope != 0) { currentFOV = FPSCameraFOV; }
            }
        }

        void Awake()
        {
            new UpdateSensitivityPatch().Enable();
            new get_AimingSensitivityPatch().Enable();
            new get_SelectedScopeIndexPatch().Enable();
            new get_SelectedScopeModePatch().Enable();
            new get_IsAimingPatch().Enable();
                     
            //add configuration slider for field of view
            configFOV = Config.Bind("General", "FOV", 75, new ConfigDescription("In-game Field of View value", new AcceptableValueRange<int>(51, 75)));

            //add coefficient slider
            configCoeff = Config.Bind("General", "Coefficient", 133, new ConfigDescription("Coefficient - increases sensitivity at higher zoom levels", new AcceptableValueRange<int>(1, 300)));

            //add sensitivity slider
            configSens = Config.Bind("General", "Sensitivity", 25, new ConfigDescription("Sensitivity while aiming", new AcceptableValueRange<int>(1, 200)));

            //override for consistent mouse to 360 distance
            configOverride = Config.Bind("Debug", "Override sensitivity", false, new ConfigDescription("Overrides sensitivity to provide consistent mouse to 360 distance regardless of zoom level."));

        }

        void Update()
        {
            if (isAiming)
            {
                //Grab FOV values for calculation
                FPSCameraFOV = Camera.allCameras[0].fieldOfView;
                if (Camera.allCamerasCount > 1) { ScopeFOV = Camera.allCameras[1].fieldOfView; }
                //calculate what FOV is right
                DetermineCurrentFOV();
            }
      
            ////do the magic!
            mySens = CalculateSensitivity(currentFOV, configFOV.Value, configSens.Value);

            //Override for crazy people, enables consistent mouse input to 360 rotation. Why would anyone do it?
            if (configOverride.Value == true) { mySens = (float)(configSens.Value / 100f); }
        }
    }
}