using BepInEx;
using System;
using UnityEngine;

namespace UniformAim
{
    public class Core
    {
        //math stuff
        //Get screen aspect ratio
        public static float GetAspectRatio()
        {
            return Camera.allCameras[0].aspect;
        }
        //Calculate horizontal FOV based on vertical FOV and aspect ratio
        public static float CalculateHFOV(float FOV)
        {
            float vFOVRad = FOV / 2 * Mathf.Deg2Rad;
            float hFOVRad = (float)(2 * Math.Atan(GetAspectRatio() * Math.Tan(vFOVRad)));

            return (float)(hFOVRad * Mathf.Rad2Deg);
        }

        //calculate sensitivity based on FOV delta and coefficient
        public static float CalculateSensitivity(float aimedFOV, float hipFOV)
        {
            //calculate horizontal FOV values for inputs
            aimedFOV = CalculateHFOV(aimedFOV) * Mathf.Deg2Rad;
            hipFOV = CalculateHFOV(hipFOV) * Mathf.Deg2Rad;

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

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

            float sensitivity = Plugin.configSens.Value / 100f;

            float result = (float)Math.Pow(tanRatio, exponent) * sensitivity;

            return result;
        }

        //check if BaseOpticCamera is present and active
        public static bool isScopeCameraActive()
        {
            if(Camera.allCamerasCount > 1) { return Camera.allCameras[1].GetComponent<Behaviour>().isActiveAndEnabled; }
            return false;
        }
        //figure out current fov based on scope and in-game camera statuses
        public static float DetermineCurrentFOV()
        {
            //dirty fix for the Ultima MP-155 shotgun
            if (Plugin.currentFPSCameraFOV> 35 && isScopeCameraActive() && Plugin.currentScopeCameraFOV == 15) { return Plugin.currentFPSCameraFOV; }

            if (Plugin.SelectedScope == 0 && isScopeCameraActive()) { return Plugin.currentScopeCameraFOV;  } else { return Plugin.currentFPSCameraFOV;  }
        }
    }
}