using System;
using System.Collections;
using System.Collections.Generic;
//using Gaia;
using Invector.vCharacterController;
using Invector.vCharacterController.AI;
using Invector.vCharacterController.AI.FSMBehaviour;
using PixelCrushers;
using Sirenix.OdinInspector;
using SRF.Components;
using UnityEngine;
using UnityEngine.Events;
using UnityEngine.SceneManagement;

namespace Beyond
{
    public class GameStateManager : Saver//AutoSingleton<GameStateManager>
    {
        public enum Difficulty
        {
            EASY = 0,
            NORMAL = 1,
            HARD = 2,
            COUNT
        };

        [Button]
        public void SetDifficulty(Difficulty d)
        {
            m_saveData.difficulty = d;
            switch (d)
            {
                case Difficulty.EASY:
                    m_enemyDamageModifier = 0.63f;
                    break;

                case Difficulty.NORMAL:
                    m_enemyDamageModifier = 1f;
                    break;

                case Difficulty.HARD:
                    m_enemyDamageModifier = 1.35f;
                    break;
            }
        }

        [Serializable]
        public class SaveData
        {
            public Difficulty difficulty = Difficulty.NORMAL;
        }

        private static GameStateManager s_instance = null;
        private static bool s_isDestroyed = false;
        private float m_enemyDamageModifier = 1f;
        public SaveData m_saveData = new();
        private HashSet<string> m_CompabStates;
        private HashSet<string> m_IdleStates;

        public static GameStateManager Instance// => s_instance;
        {
            get
            {
                if (s_instance)
                {
                    return s_instance;
                }
                else if (s_isDestroyed)
                {
                    //don't recreate object after scene destorys it
                    return null;
                }
                else
                {
                    var inst = FindObjectOfType<GameStateManager>();
                    if (inst != null)
                    {
                        s_instance = inst;
                        return s_instance;
                    }
                    else
                    {
                        var go = new GameObject("_" + typeof(GameStateManager).Name);
                        go.AddComponent<GameStateManager>(); // _instance set by Awake() constructor
                    }
                }
                return s_instance;
            }
        }
        //public void OnSc
        public override void OnDestroy()
        {
            base.OnDestroy();
            s_isDestroyed = true;
           // Debug.Log("Destroying GameStateManager");
        }
        //[ShowInInspector]
        public Difficulty GameDifficulty => m_saveData.difficulty;

        public float EnemyDamageModifier => m_enemyDamageModifier;

        public override void Awake()
        {
            base.Awake();
            if (s_instance != null)
            {
                Debug.Log("GameStateManager already exists! destroying...");
                Destroy(this);
                return;
            }
            SceneManager.sceneLoaded += SceneManager_sceneUnloaded;
            s_instance = this;
            //SetDifficulty(Difficulty.NORMAL);
            m_CompabStates = new HashSet<string>();
            m_CompabStates.Add("Combat");
            m_CompabStates.Add("Alert");
            m_CompabStates.Add("Jump Chase");
            m_CompabStates.Add("Jump");
            m_CompabStates.Add("Chase");
            m_IdleStates = new HashSet<string>();
            m_IdleStates.Add("Idle");
            m_IdleStates.Add("Flee");
            m_IdleStates.Add("Patrol");
        }
        //reset isDestroyed, so object can be recreated for the next scene
        private void SceneManager_sceneUnloaded(Scene arg0, LoadSceneMode arg1)
        {
            s_isDestroyed = false;
        }

        public enum State
        {
            NORMAL,
            COMBAT
        }

        public UnityEvent<State> m_OnStateChanged = new UnityEvent<State>();
        private HashSet<vFSMBehaviourController> m_combatControllers = new HashSet<vFSMBehaviourController>();
        private State m_state = State.NORMAL, m_prevState = State.NORMAL;

        public State CurrentState => m_state;
        public bool m_changeCameraState;
        public string m_cameraCombatState = "Combat";
        public vThirdPersonInput m_thirdPersonInput;
        private GenericInput m_jumpInput, m_rollInput;
        protected bDrawHideMeleeWeapons m_weaponDraw;
        protected vThirdPersonController m_thirdPersonController;
        public bool m_autoDrawWeapon = true;

        // Start is called before the first frame update
        public HashSet<vFSMBehaviourController> GetActiveCombatcontrollers()
        {
            return m_combatControllers;
        }

        public override void Reset()
        {
            base.Reset();
            saveAcrossSceneChanges = true;
            m_saveData.difficulty = Difficulty.NORMAL;
        }

        [Button]
        public void SetEasy()
        {
            m_saveData.difficulty = Difficulty.EASY;
        }

        [Button]
        public void SetNormal()
        {
            m_saveData.difficulty = Difficulty.NORMAL;
        }

        [Button]
        public void SetHard()
        {
            m_saveData.difficulty = Difficulty.HARD;
        }

        private void Start()
        {
            // m_state = State.NORMAL;
            if (Player.Instance == null)
            {
                return;
            }
            if (m_thirdPersonInput == null)
                m_thirdPersonInput = Player.Instance.GetComponent<vThirdPersonInput>();
            if (m_weaponDraw == null)
                m_weaponDraw = Player.Instance.GetComponent<bDrawHideMeleeWeapons>();
            if (m_thirdPersonController == null)
                m_thirdPersonController = Player.Instance.GetComponent<vThirdPersonController>();

            var respawner = Player.Instance.GetComponent<Respawner>();
            if (respawner != null)
            {
                respawner.m_onRespawned.AddListener(ResetState);
            }
            m_jumpInput = m_thirdPersonInput.jumpInput;
            m_rollInput = m_thirdPersonInput.rollInput;
        }

        public override string RecordData()
        {
            return SaveSystem.Serialize(m_saveData);
        }

        public override void ApplyData(string s)
        {
            if (!String.IsNullOrEmpty(s))
            {
                m_saveData = SaveSystem.Deserialize<SaveData>(s);
                SetDifficulty(m_saveData.difficulty);
            }
        }

        public override void ApplyDataImmediate()
        {
            // Immediately restore Lua in case other scripts'
            // Start() methods need to read values from it.
            var data = SaveSystem.currentSavedGameData.GetData(key);
            if (!String.IsNullOrEmpty(data))
            {
                m_saveData = SaveSystem.Deserialize<SaveData>(data);
                SetDifficulty(m_saveData.difficulty);
            }
        }

        private void ResetState()
        {
            foreach (var c in m_combatControllers)
            {
                c.ResetFSM();
            }
            m_combatControllers.Clear();
            m_thirdPersonInput.ResetCameraState();

            SetState(State.NORMAL);
        }

        public void SetState(State state)
        {
            if (m_state == state)
                return;
            m_prevState = m_state;
            if (m_changeCameraState)
            {
                if (m_prevState == State.COMBAT)
                {
                    m_thirdPersonInput.ResetCameraState();
                    SetDefaultInputsForRollJump();
                }
                else if (state == State.COMBAT)
                {
                    SetRollInputOnJump();
                    m_thirdPersonInput.ChangeCameraState(m_cameraCombatState, true);
                }
            }
            switch (state)
            {
                case State.COMBAT:
                    SetRollInputOnJump();

                    if (m_autoDrawWeapon && m_weaponDraw != null)
                    {
                        m_weaponDraw.DrawWeapons();
                    }
                    break;

                case State.NORMAL:
                    SetDefaultInputsForRollJump();

                    if (m_autoDrawWeapon && m_weaponDraw != null)
                    {
                        m_weaponDraw.HideWeapons();
                    }

                    break;
            }
            m_state = state;
            m_OnStateChanged?.Invoke(m_state);
        }

        private void SetRollInputOnJump()
        {
            m_thirdPersonInput.rollInput = m_jumpInput;
            m_thirdPersonInput.jumpInput = m_rollInput;
        }

        private void SetDefaultInputsForRollJump()
        {
            m_thirdPersonInput.rollInput = m_rollInput;
            m_thirdPersonInput.jumpInput = m_jumpInput;
        }

        public void OnCombat(vFSMBehaviourController combatController)
        {
            if (m_combatControllers.Count == 0)
            {
                SetState(State.COMBAT);
            }
            m_combatControllers.Add(combatController);
        }

        public void OnCombatEnd(vFSMBehaviourController combatController)
        {
            m_combatControllers.Remove(combatController);
            if (m_combatControllers.Count == 0)
            {
                SetState(State.NORMAL);
            }
        }

        // Update is called once per frame
        //private float m_timer = 1;
        private void Update()
        {
            foreach (var c in m_combatControllers)
            {
                //Debug.Log($"{c.name} is in {c.currentState.Name}");
                string name = c.currentState.Name;

                //if (!m_CompabStates.Contains(name))
                if (m_IdleStates.Contains(name))
                {
                    OnCombatEnd(c);
                    break;
                }
            }
        }
    }
}