using System;
using System.Collections.Generic;
using BehaviorDesigner.Runtime;
using Sirenix.OdinInspector;
using UnityEditor.Animations;
using UnityEngine;

// ReSharper disable once CheckNamespace
namespace BlueWaterProject
{
    public class UnitManager : Singleton<UnitManager>
    {
        #region Property and variable
        
        [Tooltip("Pirate 프리팹")]
        [field: SerializeField] public GameObject PiratePrefab { get; private set; }
        
        [Tooltip("캐릭터 기초 프리팹")]
        [field: SerializeField] public GameObject BaseHumanPrefab { get; private set; }
        
        [Tooltip("화살 프리팹")]
        [field: SerializeField] public GameObject ArrowPrefab { get; private set; }
        
        [Tooltip("Enemy 비헤이비어 트리")]
        [field: SerializeField] public ExternalBehaviorTree EnemyBehaviorTree { get; private set; }
        
        [Tooltip("Pirate 비헤이비어 트리")]
        [field: SerializeField] public ExternalBehaviorTree PirateBehaviorTree { get; private set; }

        [Tooltip("바닥 레이어")]
        [field: SerializeField] public LayerMask GroundLayer { get; private set; }
        
        [Tooltip("바닥과의 최대 허용 거리")]
        [field: SerializeField] public float MaxGroundDistance { get; private set; } = 4f;
        
        [Tooltip("병력 간의 간격")]
        [field: SerializeField] public float UnitSpacing { get; private set; } = 2.5f;
        
        [field: Tooltip("병력들의 애니메이터 컨트롤러 리스트")]
        [field: SerializeField] public List<AnimatorController> AIAnimatorControllerList { get; private set; } = new(GlobalValue.AI_ANIMATOR_CAPACITY);
        
        private Transform pirateUnits;
        
        private const int ANIMATOR_CONTROLLER_PREFAB_CAPACITY = 6;
        private const int PIRATE_UNIT_CAPACITY = 50;

        #endregion

        #region Unity built-in function

        protected override void OnAwake()
        {
            GroundLayer = LayerMask.GetMask("Ground");
        }

        private void Reset()
        {
            GroundLayer = LayerMask.GetMask("Ground");
            MaxGroundDistance = 4f;
            UnitSpacing = 2.5f;
            InitCharacterPrefabList();
        }

        #endregion

        #region Custom function
        
#if UNITY_EDITOR
        /// <summary>
        /// 프리팹 초기화 함수
        /// </summary>
        [GUIColor(0, 1, 0)]
        [ShowIf("@PiratePrefab == null || BaseHumanPrefab == null || ArrowPrefab == null || EnemyBehaviorTree == null || PirateBehaviorTree == null ||" +
                "AIAnimatorControllerList == null || AIAnimatorControllerList.Count != ANIMATOR_CONTROLLER_PREFAB_CAPACITY")]
        [Button("프리팹 초기화")]
        private void InitCharacterPrefabList()
        {
            GroundLayer = LayerMask.GetMask("Ground");
            
            PiratePrefab = Utils.LoadFromFolder<GameObject>("Assets/05.Prefabs/Character/Unit", "PirateUnit", ".prefab");
            BaseHumanPrefab = Utils.LoadFromFolder<GameObject>("Assets/05.Prefabs/Character", "BaseHuman", ".prefab");
            ArrowPrefab = Utils.LoadFromFolder<GameObject>("Assets/05.Prefabs", "Arrow_01", ".prefab");
            EnemyBehaviorTree = Utils.LoadFromFolder<ExternalBehaviorTree>("Assets/09.BehaviorTree/Enemy", "BaseEnemyAi", ".asset");
            PirateBehaviorTree = Utils.LoadFromFolder<ExternalBehaviorTree>("Assets/09.BehaviorTree/Pirate", "BasePirateAi", ".asset");
            AIAnimatorControllerList = new List<AnimatorController>(ANIMATOR_CONTROLLER_PREFAB_CAPACITY)
            {
                Utils.LoadFromFolder<AnimatorController>("Assets/07.Animation", "Archer", ".controller"),
                Utils.LoadFromFolder<AnimatorController>("Assets/07.Animation", "Axeman", ".controller"),
                Utils.LoadFromFolder<AnimatorController>("Assets/07.Animation", "SpearKnight", ".controller"),
                Utils.LoadFromFolder<AnimatorController>("Assets/07.Animation", "Spearman", ".controller"),
                Utils.LoadFromFolder<AnimatorController>("Assets/07.Animation", "SwordKnight", ".controller"),
                Utils.LoadFromFolder<AnimatorController>("Assets/07.Animation", "Swordman", ".controller")
            };
        }
#endif

        private void SetPlayerUnits()
        {
            var pirateUnitsObj = GameObject.Find("PirateUnits");
            if (pirateUnitsObj)
            {
                pirateUnits = pirateUnitsObj.transform;
            }
            else
            {
                pirateUnitsObj = new GameObject("PirateUnits");
                pirateUnitsObj.transform.SetPositionAndRotation(Vector3.zero, Quaternion.identity);
                pirateUnits = pirateUnitsObj.transform;
            }
        }

        private void SetUnitName(BaseUnit baseUnit, string unitName, string baseName)
        {
            if (string.IsNullOrEmpty(unitName))
            {
                const int maxIterations = 100;
                var namingNum = 0;

                while (namingNum < maxIterations)
                {
                    var newUnitName = $"{baseName}_Unit_{namingNum + 1:00}";
                    var checkGameObject = GameObject.Find(newUnitName);
                    if (checkGameObject && checkGameObject != baseUnit.gameObject)
                    {
                        namingNum++;
                    }
                    else
                    {
                        baseUnit.gameObject.name = newUnitName;
                        break;
                    }
                }
            }
            else
            {
                baseUnit.gameObject.name = unitName;
            }
        }

        public void PirateUnitCreateAndAssign(string cardIdx, Vector3 assignPos)
        {
            var newUnitController = CreatePirateUnit(cardIdx, EAttackerType.OFFENSE);
            AssignPirateUnit(newUnitController, assignPos, true);
        }
        
        /// <summary>
        /// 동적 생성용 부대 생성 함수
        /// </summary>
        public PirateUnit CreatePirateUnit(string cardIdx, EAttackerType attackerType)
        {
            var card = DataManager.Inst.GetCardDictionaryFromKey(cardIdx);
            var unit = DataManager.Inst.GetPirateUnitStatDictionaryFromKey(card.UnitIdx);
            var captainStat = DataManager.Inst.GetPirateStatDictionaryFromKey(unit.CaptainStatIdx);
            var sailorStat = DataManager.Inst.GetPirateStatDictionaryFromKey(unit.SailorStatIdx);
            
            SetPlayerUnits();

            var newUnitController = Instantiate(PiratePrefab, Vector3.zero, Quaternion.identity, pirateUnits).GetComponent<PirateUnit>();
            newUnitController.pirateUnitStat = new PirateUnitStat(unit);
            
            DestroyDeployedUnits(newUnitController);

            var pirateStat = DataManager.Inst.GetPirateStatDictionaryFromKey(newUnitController.pirateUnitStat.SailorStatIdx);
            var baseName = pirateStat.UnitType.ToString();
            SetUnitName(newUnitController, newUnitController.pirateUnitStat.UnitName, baseName);
            
            newUnitController.pirateUnitStat.PirateAiList = new List<PirateAi>(newUnitController.pirateUnitStat.SailorCount + 1);
            
            var unitControllerTransform = newUnitController.transform;
            var unitControllerRotation = unitControllerTransform.rotation;
            unitControllerTransform.rotation = Quaternion.identity;
            
            var gridSize = 0;

            switch (newUnitController.pirateUnitStat.SailorCount)
            {
                case 0:
                    gridSize = 1;
                    break;
                case <= 3:
                    gridSize = 2;
                    break;
                case <= 8:
                    gridSize = 3;
                    break;
                case <= 15:
                    gridSize = 4;
                    break;
                default:
                    print("유닛의 병사 숫자 설정 에러");
                    break;
            }
            
            var heroPosition = (gridSize * gridSize) / 2;
            
            for (var i = 0; i < gridSize; i++)
            {
                for (var j = 0; j < gridSize; j++)
                {
                    var currentPos = i * gridSize + j;

                    if (currentPos > newUnitController.pirateUnitStat.SailorCount) break;
                    
                    var zOffset = (i - (gridSize - 1) / 2.0f) * UnitSpacing;
                    var xOffset = (j - (gridSize - 1) / 2.0f) * UnitSpacing;
                    var spawnPosition = unitControllerTransform.position + new Vector3(xOffset, 0, zOffset);

                    var baseObj = Instantiate(BaseHumanPrefab, spawnPosition, 
                        Quaternion.identity, newUnitController.transform);

                    var newSoldierName = $"{baseName}_{currentPos + 1:00}";

                    baseObj.name = newSoldierName;
                    baseObj.gameObject.SetActive(false);

                    var pirateAi = GetPirateAi(baseObj, pirateStat.UnitType, currentPos == heroPosition ? captainStat : sailorStat);

                    pirateAi.SetAttackerType(attackerType);
                    pirateAi.SetOffenseType(newUnitController.pirateUnitStat.OffenseType);
                    pirateAi.SetDefenseType(newUnitController.pirateUnitStat.DefenseType);
                    newUnitController.pirateUnitStat.PirateAiList.Add(pirateAi);
                }
            }
            newUnitController.transform.rotation *= unitControllerRotation;

            return newUnitController;
        }
        
        /// <summary>
        /// 에디터용 부대 생성 함수
        /// </summary>
        public void CreateEnemyUnitInEditor(EnemyUnit enemyUnit)
        {
            var unit = DataManager.Inst.GetEnemyUnitStatSoFromKey(enemyUnit.enemyUnitStat.Idx);

            SetPlayerUnits();
            
            enemyUnit.enemyUnitStat = new EnemyUnitStat(unit);
            
            var captainStat = DataManager.Inst.GetEnemyStatSoFromKey(enemyUnit.enemyUnitStat.CaptainStatIdx);
            var sailorStat = DataManager.Inst.GetEnemyStatSoFromKey(enemyUnit.enemyUnitStat.SailorStatIdx);
            
            DestroyDeployedUnits(enemyUnit);
            
            var enemyStat = DataManager.Inst.GetEnemyStatSoFromKey(enemyUnit.enemyUnitStat.SailorStatIdx);
            var baseName = enemyStat.UnitType.ToString();
            SetUnitName(enemyUnit, enemyUnit.enemyUnitStat.UnitName, baseName);
            
            enemyUnit.enemyUnitStat.EnemyAiList = new List<EnemyAi>(enemyUnit.enemyUnitStat.SailorCount + 1);
            
            var unitControllerTransform = enemyUnit.transform;
            var unitControllerRotation = unitControllerTransform.rotation;
            unitControllerTransform.rotation = Quaternion.identity;

            var gridSize = 0;

            switch (enemyUnit.enemyUnitStat.SailorCount)
            {
                case 0:
                    gridSize = 1;
                    break;
                case <= 3:
                    gridSize = 2;
                    break;
                case <= 8:
                    gridSize = 3;
                    break;
                case <= 15:
                    gridSize = 4;
                    break;
                default:
                    print("유닛의 병사 숫자 설정 에러");
                    break;
            }
            
            var heroPosition = (gridSize * gridSize) / 2;
            
            for (var i = 0; i < gridSize; i++)
            {
                for (var j = 0; j < gridSize; j++)
                {
                    var currentPos = i * gridSize + j;

                    if (currentPos > enemyUnit.enemyUnitStat.SailorCount) break;
                    
                    var zOffset = (i - (gridSize - 1) / 2.0f) * UnitSpacing;
                    var xOffset = (j - (gridSize - 1) / 2.0f) * UnitSpacing;
                    var spawnPosition = unitControllerTransform.position + new Vector3(xOffset, 0, zOffset);

                    var baseObj = Instantiate(BaseHumanPrefab, spawnPosition, 
                        Quaternion.identity, enemyUnit.transform);

                    var newSoldierName = $"{baseName}_{currentPos + 1:00}";

                    baseObj.name = newSoldierName;
                    baseObj.gameObject.SetActive(false);

                    var currentStat = currentPos == heroPosition ? captainStat : sailorStat;
                    var enemyAi = GetEnemyAi(baseObj, enemyStat.UnitType, currentStat);

                    enemyAi.SetAttackerType(enemyUnit.enemyUnitStat.AttackerType);
                    enemyAi.SetOffenseType(enemyUnit.enemyUnitStat.OffenseType);
                    enemyAi.SetDefenseType(enemyUnit.enemyUnitStat.DefenseType);
                    enemyAi.InitStartInEditor();
                    enemyUnit.enemyUnitStat.EnemyAiList.Add(enemyAi);
                }
            }
            enemyUnit.transform.rotation *= unitControllerRotation;
        }

        private EnemyAi GetEnemyAi(GameObject baseObj, GlobalValue.UnitType unitType, EnemyStat enemyStat)
        {
            EnemyAi enemyAi = unitType switch
            {
                GlobalValue.UnitType.ARCHER_E => baseObj.AddComponent<EnemyArcher>(),
                GlobalValue.UnitType.SPEAR_KNIGHT_E => baseObj.AddComponent<EnemySpearKnight>(),
                GlobalValue.UnitType.SPEARMAN_E => baseObj.AddComponent<EnemySpearman>(),
                GlobalValue.UnitType.SWORD_KNIGHT_E => baseObj.AddComponent<EnemySwordKnight>(),
                GlobalValue.UnitType.SWORDMAN_E => baseObj.AddComponent<EnemySwordman>(),
                _ => throw new ArgumentOutOfRangeException(nameof(unitType), unitType, null)
            };

            if (enemyAi == null) return null;
            
            enemyAi.EnemyStat = new EnemyStat(enemyStat);
            return enemyAi;
        }
        
        private PirateAi GetPirateAi(GameObject baseObj, GlobalValue.UnitType unitType, PirateStat pirateStat)
        {
            PirateAi pirateAi = unitType switch
            {
                GlobalValue.UnitType.ARCHER_P => baseObj.AddComponent<PirateArcher>(),
                GlobalValue.UnitType.AXEMAN_P => baseObj.AddComponent<PirateAxeman>(),
                GlobalValue.UnitType.SPEARMAN_P => baseObj.AddComponent<PirateSpearman>(),
                GlobalValue.UnitType.SWORD_KNIGHT_P => baseObj.AddComponent<PirateSwordKnight>(),
                GlobalValue.UnitType.SWORDMAN_P => baseObj.AddComponent<PirateSwordman>(),
                _ => throw new ArgumentOutOfRangeException(nameof(unitType), unitType, null)
            };

            if (pirateAi == null) return null;
            
            pirateAi.PirateStat = new PirateStat(pirateStat);
            return pirateAi;
        }
        
        /// <summary>
        /// 유닛 배치 함수
        /// </summary>
        public bool CanAssignUnit(EnemyUnit enemyUnit, Vector3 assignPos)
        {
            if (enemyUnit.enemyUnitStat.EnemyAiList.Count <= 0) return false;
            
            enemyUnit.transform.position = assignPos;

            for (var i = 0; i < enemyUnit.enemyUnitStat.SailorCount; i++)
            {
                var unitPos = enemyUnit.enemyUnitStat.EnemyAiList[i].transform.position;
                var ray = new Ray(unitPos + Vector3.up, Vector3.down);
                if (Physics.Raycast(ray, out var hit, MaxGroundDistance, GroundLayer))
                {
                    unitPos.y = hit.point.y;
                }
                else
                {
                    return false;
                }
            }

            return true;
        }

        public void AssignEnemyUnit(EnemyUnit enemyUnit, Vector3 assignPos)
        {
            enemyUnit.transform.position = assignPos;
            
            foreach (var unit in enemyUnit.enemyUnitStat.EnemyAiList)
            {
                var myPos = unit.transform.position;
                var ray = new Ray(myPos + Vector3.up, Vector3.down);
                if (Physics.Raycast(ray, out var hit, MaxGroundDistance, GroundLayer))
                {
                    unit.transform.position = new Vector3(myPos.x, hit.point.y, myPos.z);
                }
            }

            foreach (var unit in enemyUnit.enemyUnitStat.EnemyAiList)
            {
                unit.gameObject.SetActive(true);
            }
        }
        
        public void AssignPirateUnit(PirateUnit pirateUnit, Vector3 assignPos, bool isOffense)
        {
            pirateUnit.transform.position = assignPos;
            IslandInfo hitIslandInfo = null;
            
            foreach (var unit in pirateUnit.pirateUnitStat.PirateAiList)
            {
                var myPos = unit.transform.position;
                var ray = new Ray(myPos + Vector3.up, Vector3.down);
                if (Physics.Raycast(ray, out var hit, MaxGroundDistance, GroundLayer))
                {
                    unit.transform.position = new Vector3(myPos.x, hit.point.y, myPos.z);
                    
                    if (isOffense && hitIslandInfo == null)
                    {
                        hitIslandInfo = hit.transform.root.GetComponent<IslandInfo>();
                    }
                }
            }

            foreach (var unit in pirateUnit.pirateUnitStat.PirateAiList)
            {
                if (isOffense)
                {
                    unit.SetAttackingIslandInfo(hitIslandInfo);
                }
                unit.gameObject.SetActive(true);
            }
        }

        /// <summary>
        /// 기존에 생성된 부대 병력들이 있으면 확인해서 삭제해주는 함수
        /// </summary>
        public void DestroyDeployedUnits(BaseUnit baseUnit)
        {
            if (baseUnit.transform.childCount <= 0) return;
            
            for (var i = baseUnit.transform.childCount - 1; i >= 0; i--)
            {
                if (Application.isPlaying)
                {
                    Destroy(baseUnit.transform.GetChild(i).gameObject);
                }
                else
                {
                    DestroyImmediate(baseUnit.transform.GetChild(i).gameObject);
                }
            }
        }

        #endregion
    }
}