using System;
using Cielonos.MainGame.Buffs.Character;
using Opsive.BehaviorDesigner.Runtime.Tasks;
using Opsive.GraphDesigner.Runtime;
using Opsive.GraphDesigner.Runtime.Variables;
using Opsive.Shared.Utility;
using UnityEngine;

namespace Cielonos.MainGame.Characters.AI
{
    [Description("模块化地检测目标身上是否满足指定的 Buff 状态（默认检测存在性，可选择开启堆叠或时间检测）。所有开启的条件必须同时满足。")]
    [NodeIcon("Assets/Sprites/Icon/Condition.png")]
    [Category("Cielonos/Buffs")]
    public class CheckBuff : AutomataConditionalBase
    {
        public enum Operation
        {
            LessThan,
            LessThanOrEqualTo,
            EqualTo,
            NotEqualTo,
            GreaterThanOrEqualTo,
            GreaterThan
        }

        [Tooltip("目标对象。留空则默认检测 AI 自身。")]
        public SharedVariable<GameObject> target;

        [Tooltip("选择要检测的 Buff 类型。")]
        [SerializeReference]
        public ICharacterBuffFactory buffFactory;

        [Tooltip("True 意味着该 Buff 必须存在且符合所有开启的具体指标；False 意味着该 Buff 绝不能存在。")]
        public bool checkExist = true;

        [Tooltip("开启：检测统一堆叠模块(UnitedStackSubmodule) 的层数")]
        public bool checkUnitedStack = false;
        public Operation unitedStackOperation = Operation.GreaterThanOrEqualTo;
        [Tooltip("所需的堆叠层数 (UnitedStack)")]
        public SharedVariable<int> unitedStackThreshold = 1;

        [Tooltip("开启：检测独立堆叠模块(IndependentStackSubmodule) 的总层数")]
        public bool checkIndependentStack = false;
        public Operation independentStackOperation = Operation.GreaterThanOrEqualTo;
        [Tooltip("所需的堆叠总层数 (IndependentStack)")]
        public SharedVariable<int> independentStackThreshold = 1;

        [Tooltip("开启：检测时间模块(TimeSubmodule) 的剩余时间")]
        public bool checkTimeSubmodule = false;
        public Operation timeOperation = Operation.LessThanOrEqualTo;
        [Tooltip("所需的剩余时间")]
        public SharedVariable<float> timeThreshold = 3f;

        private CharacterBase GetTarget()
        {
            if (target != null && target.Value != null)
                return target.Value.GetComponent<CharacterBase>();
            return self;
        }

        public override TaskStatus OnUpdate()
        {
            if (buffFactory == null)
            {
                Debug.LogWarning("[CheckBuff] 未配置检测的 Buff 类型。");
                return TaskStatus.Failure;
            }

            var character = GetTarget();
            if (character == null) return TaskStatus.Failure;

            CharacterBuffBase dummyBuff = buffFactory.Create();
            Type targetBuffType = dummyBuff.GetType();
            CharacterBuffBase existingBuff = character.buffSm.buffList.Find(x => x.GetType() == targetBuffType);

            // ============================================
            // 1. 存在性判定（最高优先级的决断）
            // ============================================
            if (checkExist == false)
            {
                // 期望 Buff 不存在。如果它确实不存在，返回 Success，反之失败。
                return existingBuff == null ? TaskStatus.Success : TaskStatus.Failure;
            }

            // 从这里往下，期望 Buff【必须存在】
            if (existingBuff == null)
            {
                return TaskStatus.Failure;
            }

            // ============================================
            // 2. 深入各个子模块检测（只检查开启项，且必须 ALL AND）
            // ============================================
            
            // 统一堆叠检查
            if (checkUnitedStack)
            {
                if (existingBuff.unitedStackSubmodule == null) 
                    return TaskStatus.Failure;

                if (!Compare(existingBuff.unitedStackSubmodule.stackAmount, unitedStackOperation, unitedStackThreshold.Value)) 
                    return TaskStatus.Failure;
            }

            // 独立堆叠检查
            if (checkIndependentStack)
            {
                if (existingBuff.independentStackSubmodule == null) 
                    return TaskStatus.Failure;

                if (!Compare(existingBuff.independentStackSubmodule.totalStackAmount, independentStackOperation, independentStackThreshold.Value)) 
                    return TaskStatus.Failure;
            }

            // 剩余时间检查
            if (checkTimeSubmodule)
            {
                if (existingBuff.timeSubmodule == null) 
                    return TaskStatus.Failure;

                if (!Compare(existingBuff.timeSubmodule.timeLeft, timeOperation, timeThreshold.Value)) 
                    return TaskStatus.Failure;
            }

            // 全部过关了
            return TaskStatus.Success;
        }

        private bool Compare(float value1, Operation operation, float value2)
        {
            switch (operation)
            {
                case Operation.LessThan: return value1 < value2;
                case Operation.LessThanOrEqualTo: return value1 <= value2;
                case Operation.EqualTo: return Mathf.Approximately(value1, value2);
                case Operation.NotEqualTo: return !Mathf.Approximately(value1, value2);
                case Operation.GreaterThanOrEqualTo: return value1 >= value2;
                case Operation.GreaterThan: return value1 > value2;
            }
            return false;
        }

        public override void Reset()
        {
            base.Reset();
            target = null;
            buffFactory = null;
            checkExist = true;
            
            checkUnitedStack = false;
            unitedStackOperation = Operation.GreaterThanOrEqualTo;
            unitedStackThreshold = 1;
            
            checkIndependentStack = false;
            independentStackOperation = Operation.GreaterThanOrEqualTo;
            independentStackThreshold = 1;

            checkTimeSubmodule = false;
            timeOperation = Operation.LessThanOrEqualTo;
            timeThreshold = 3f;
        }
    }
}