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

namespace UniformAim
{
    internal class Core
    {
        //math stuff
        internal float CalculateHFOV(float FOV)
        {
            //RETURNS RADIANS
            return Camera.VerticalToHorizontalFieldOfView(FOV, Camera.main.aspect);
        }

        //calculate sensitivity based on FOV delta and coefficient
        internal 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
        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
        internal float DetermineCurrentFOV(float FPSCameraFOV = 60f, float ScopeCameraFOV = 28f, int SelectedScope = 0, int SelectedScopeMode = 0)
        {
            var leupold = SightPatches.customOpticPatches["scope_leupold_d_evo(Clone)"];
            var ultima = SightPatches.customOpticPatches["tactical_mp155_kalashnikov_ultima_camera(Clone)"];

            if (leupold != null && leupold.activeInHierarchy)
            {
                switch (Plugin.SelectedScope)
                {
                    case 0: return Plugin.currentFPSCameraFOV;
                    case 1: return Plugin.currentScopeCameraFOV;
                }
            }

            if (ultima != null && ultima.activeInHierarchy && isScopeCameraActive() && Plugin.currentScopeCameraFOV == 15)
            {
                return Plugin.currentFPSCameraFOV;
            }

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