using BepInEx;
using BepInEx.Bootstrap;
using BepInEx.Configuration;
using Comfort.Common;
using EFT;
using System;
using System.Collections;
using UnityEngine;


// DLL dependencies needed to update the Uniform Aim Mod for newer versions of the game
//%tarkovdir%\BepInEx\core\BepInEx.dll
//%tarkovdir%\EscapeFromTarkov_Data\Managed\Assembly-CSharp.dll
//%tarkovdir%\EscapeFromTarkov_Data\Managed\Aki.Reflection.dll
//%tarkovdir%\EscapeFromTarkov_Data\Managed\Comfort.dll
//%tarkovdir%\EscapeFromTarkov_Data\Managed\UnityEngine.dll
//%tarkovdir%\EscapeFromTarkov_Data\Managed\UnityEngine.CoreModule.dll


namespace notGreg.UniformAim
{
    [BepInPlugin("com.notGreg.UniformAim", "notGreg's Uniform Aim for Tarkov", "3.8.0")]
    [BepInDependency("RealismMod", BepInDependency.DependencyFlags.SoftDependency)]
    public class Plugin : BaseUnityPlugin
    {
        ConfigEntry<int> configExponent;
        ConfigEntry<int> configSens;
        ConfigEntry<bool> enableDebug;

        public static bool isRealismModPresent = Chainloader.PluginInfos.ContainsKey("RealismMod");

        void Awake()
        {
            configExponent = Config.Bind("General", "Coefficient", 133, new ConfigDescription("", new AcceptableValueRange<int>(10, 500)));
            //configSens = Config.Bind("General", "Sensitivity", 1.0f, new ConfigDescription("", new AcceptableValueRange<float>(0.01f, 2.0f))); // an old float-based sensitivity for future reference
            configSens = Config.Bind("General", "Sensitivity", 100, new ConfigDescription("", new AcceptableValueRange<int>(10, 200)));

            enableDebug = Config.Bind("Debug", "Enable debug logging", false);


            if (!isRealismModPresent)
            {
                new get_AimingSensitivityPatch().Enable();
            }
            else
            {
                if(enableDebug.Value) Logger.LogInfo("RealismMod detected! Abandoning aimingSens patch...\nMake sure to use the compatibility plugin!");
            }
        }

        Player mainPlayer;
        int inGameFOV;
        float inGameAimedSens;
        public static float aimingSens = 1.0f;

        //this function can be replaced by FixedUpdate() at 50Hz (adjustable via Time.fixedDeltaTime)
        //FixedUpdate() proved to be slightly more reliable in the past, however it had other unintended effects on the game.
        void FixedUpdate()
        {
            //check if the world instance exists
            if (Singleton<AbstractGame>.Instance == null)
            {
                return;
            }

            //grab the game status of the existing instance
            GameStatus currentGameStatus = Singleton<AbstractGame>.Instance.Status;

            //check if the game has started and if the player exists. If the player is aiming, update the scoped sensitivity (executed every frame while aiming)
            if (currentGameStatus == GameStatus.Started && mainPlayer != null)
            {
                if (mainPlayer.HandsController.IsAiming)
                {
                    aimingSens = calculateSensitivity();
                }
                return;
            }

            if(enableDebug.Value) Logger.LogInfo("Switch on GameStatus");
            switch (currentGameStatus)
            {
                case GameStatus.Started:
                    {
                        mainPlayer = getLocalPlayer();
                        if(enableDebug.Value) Logger.LogInfo($"Subscribing to onAimingChanged event");
                        subscribeOnAimingChanged();

                        if(enableDebug.Value) Logger.LogInfo("TryGetCameras coroutines");
                        StartCoroutine(tryGetMainCamera());
                        StartCoroutine(tryGetScopeCamera());

                        break;
                    }
                case GameStatus.SoftStopping:
                case GameStatus.Stopped:
                    {
                        mainPlayer = null;
                        break;
                    }
                default:
                    {
                        break;
                    }
            }


        }

        //this function grabs the Field of View from the settings. This is the function that most often needs patching after update.
        //Appropriate class can usually be found by searching for the "ClearSettings" function.
        int getInGameFOV()
        {
            int fov = Singleton<SharedGameSettingsClass>.Instance.Game.Settings.FieldOfView;
            return fov;
        }

        //this function grabs the Aiming Sensitivity from the settings. This is the function that most often needs patching after update.
        //Appropriate class can usually be found by searching for the "ClearSettings" function.
        float getInGameAimSens()
        {
            float sens = Singleton<SharedGameSettingsClass>.Instance.Control.Settings.MouseAimingSensitivity;
            if(enableDebug.Value) Logger.LogInfo($"In-game AimSens: {sens}");
            return sens;
        }

        Player getLocalPlayer()
        {
            if(enableDebug.Value) Logger.LogInfo("Setting local player...");
            return Singleton<GameWorld>.Instance.RegisteredPlayers.Find(p => p.IsYourPlayer) as Player;
        }

        WaitForSecondsRealtime myDelay = new WaitForSecondsRealtime(1f);
        Camera mainCamera;
        Camera scopeCamera;

        //this coroutine attempts to find the FPS Camera in the scene.
        IEnumerator tryGetMainCamera()
        {
            string cameraName = "FPS Camera";
            if (GameObject.Find(cameraName) != null)
            {
                mainCamera = GameObject.Find(cameraName).GetComponent<Camera>();
                if (enableDebug.Value) Logger.LogInfo($"{mainCamera.name} found!");
            }
            else
            {
                if (enableDebug.Value) Logger.LogMessage($"Camera \"{cameraName}\" not found, rescheduling...");
                yield return myDelay;
                StartCoroutine(tryGetMainCamera());
                yield break;
            }
            yield return null;
        }

        //this coroutine attempts to find existing baseOpticCamera in the scene.
        IEnumerator tryGetScopeCamera()
        {
            string cameraName = "BaseOpticCamera(Clone)";
            if (GameObject.Find(cameraName) != null)
            {
                scopeCamera = GameObject.Find(cameraName).GetComponent<Camera>();
                if(enableDebug.Value) Logger.LogInfo($"{scopeCamera.name} found!");
            }
            yield break;
        }

        //figure out whether the player is using a magnified optic or not. Return the camera of the sight.
        float determineCurrentAimedFOV()
        {
            if(enableDebug.Value)
            {
                Logger.LogInfo($"Current scope: {mainPlayer.ProceduralWeaponAnimation.CurrentAimingMod.Item.LocalizedName()} isOptic? {mainPlayer.ProceduralWeaponAnimation.CurrentScope.IsOptic}");
            }
            if (mainPlayer.ProceduralWeaponAnimation.CurrentScope.IsOptic)
            {
                return scopeCamera.fieldOfView;
            }
            return mainCamera.fieldOfView;
        }

        float calculateSensitivity()
        {
            if(enableDebug.Value) Logger.LogInfo("calculateSensitivity()");
            //grab vertical hipfire field of view (FOV set by the user in the setting), then convert it to horizontal FOV
            //convert degrees to radians
            float hipFOV = Mathf.Deg2Rad * Camera.VerticalToHorizontalFieldOfView(inGameFOV, mainCamera.aspect);

            //grab current field of view while aiming, then convert it to horizontal FOV
            //convert degrees to radians
            float aimedFOV = Mathf.Deg2Rad * Camera.VerticalToHorizontalFieldOfView(determineCurrentAimedFOV(), mainCamera.aspect);

            //exponent applied to the ratio of aimedFOV to hipFOV, causes sights to become relatively faster or slower as zoom increases
            float exponent = 100f / configExponent.Value;

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

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

            if(enableDebug.Value) Logger.LogInfo($"Sensitivity: {sensitivity}");
            return sensitivity * (configSens.Value / 100.0f);
        }


        void subscribeOnAimingChanged()
        {
            //HandsChangedEvent triggers whenever player changes weapons
            //without it the patch would cease to work as expected when weapons were changed
            mainPlayer.HandsChangedEvent += (handsArgs) =>
            {
                //onAimingChanged triggers whenever the player starts or stops aiming.
                mainPlayer.HandsController.OnAimingChanged += (aimArgs) =>
                {
                    if (enableDebug.Value) Logger.LogInfo($"Scope: {mainPlayer.ProceduralWeaponAnimation.CurrentAimingMod.Item.LocalizedName()} isOptic? {mainPlayer.ProceduralWeaponAnimation.CurrentScope.IsOptic}");
                    inGameFOV = getInGameFOV();
                    inGameAimedSens = getInGameAimSens();
                    StartCoroutine(tryGetScopeCamera());
                };
            };
        }
    }
}