using System;
using System.Collections.Generic;
using Articy.Touhou;
using Articy.Touhou.Features;
using Articy.Unity;

namespace Game
{
    public enum EElementType
    {
        None,
        Arcane,
        Dark,
        Earth,
        Flame,
        Ice,
        Laya,
        Light,
        Lightning,
        Poison,
        Water,
        Max,
        Both = 99,
    }
    public partial class UtilElement
    {
        private static Dictionary<uint, ElementReactFeature> _mElementReact;
        static UtilElement()
        {
            _mElementReact = new Dictionary<uint, ElementReactFeature>();
            InitElementReact();
        }
        public static void ElementBuff(int owner, int target, string buffId, int level)
        {
            Util.AddBuff(owner, target, buffId, 0, level);
        }
        private static void AddBuff(List<Tuple<string, int, int>> elementEffectList, ArticyObject buffObj, int level, int owner)
        {
            if (buffObj != null)
            {
                elementEffectList.Add(new Tuple<string, int, int>(buffObj.TechnicalName, level, owner));
            }
        }
        public static uint ElementReact(uint elementMask, List<Tuple<EElementType, int>> elementList, List<Tuple<string, int, int>> elementEffectList)
        {
            //反应规则: 1.新加入的先互相反应 2.不同元素优先反应

            //反应新加入的元素
            var isStable = false;
            while (!isStable)
            {
                isStable = true;
                for (int i = 0; i < elementList.Count; i++)
                {
                    for (int j = i + 1; j < elementList.Count; j++)
                    {
                        var e1 = elementList[i];
                        var e2 = elementList[j];
                        var owner = e1.Item2 != 0 ? e1.Item2 : e2.Item2;
                        var result = _mElementReact[Combine(e1.Item1, e2.Item1)];
                        var resultElement = (EElementType)result.ElementResult;
                        if (resultElement == EElementType.Both)
                        {
                            continue;
                        }
                        isStable = false;
                        elementList.RemoveAt(j);
                        elementList.RemoveAt(i);
                        if (resultElement != EElementType.None)
                        {
                            elementList.Add(new Tuple<EElementType, int>(resultElement, owner));
                        }
                        AddBuff(elementEffectList, result.Buff, result.BuffLevel, owner);
                        break;
                    }
                    if (!isStable)
                    {
                        break;
                    }
                }
            }
            //反应不同元素
            isStable = false;
            while (!isStable)
            {
                isStable = true;
                for (int i = 0; i < elementList.Count; i++)
                {
                    var mask = Mask(elementList[i].Item1);
                    if ((mask & elementMask) != 0)
                    {
                        //相同元素先排除
                        continue;
                    }
                    var maskNew = mask | elementMask;//新元素加入后的mask
                    foreach (var item in _mElementReact)
                    {
                        var key = item.Key;
                        if ((maskNew | key) == maskNew)
                        {
                            var result = _mElementReact[key];
                            var resultElement = (EElementType)result.ElementResult;
                            if (resultElement == EElementType.Both)
                            {
                                //如果可以共存 直接加入
                                elementMask |= key;
                                continue;
                            }
                            isStable = false;   //不同元素必定反应
                            elementMask -= elementMask & key;   //原elementMask是稳定的
                            if (resultElement != EElementType.None)
                            {
                                elementList.Add(new Tuple<EElementType, int>(resultElement, elementList[i].Item2));//生成的元素加入elementList等待下一轮反应
                            }
                            AddBuff(elementEffectList, result.Buff, result.BuffLevel, elementList[i].Item2);
                            elementList.RemoveAt(i);
                            break;
                        }
                    }
                    if (isStable)
                    {
                        //加入后仍然稳定
                        elementMask = maskNew;
                        elementList.RemoveAt(i);
                    }
                    break;
                }
            }
            //反应相同元素
            for (int i = 0; i < elementList.Count; i++)
            {
                var key = Combine(elementList[i].Item1, elementList[i].Item1);
                var result = _mElementReact[key];
                AddBuff(elementEffectList, result.Buff, result.BuffLevel, elementList[i].Item2);
            }
            elementList.Clear();
            return elementMask;
        }
        public static uint Combine(EElementType e1, EElementType e2)
        {
            if (e1 == e2)
            {
                return Mask(e1) << 16;
            }
            return Mask(e1) | Mask(e2);
        }
        public static uint Mask(EElementType e)
        {
            return (1u << (int)e);
        }
        private static void InitElementReact()
        {
            var reactList = ArticyDatabase.GetAllOfType<ElementReact>();
            foreach (var item in reactList)
            {
                var react = item.Template.ElementReact;
                var e1 = (EElementType)react.Element1;
                var e2 = (EElementType)react.Element2;
                _mElementReact[Combine(e1, e2)] = react;
                _mElementReact[Combine(e2, e1)] = react;
            }
        }
    }
}