using System;
using System.Numerics;
using IVDataFormat;
using Spine.Unity;

[Serializable]
public struct MateGlobalProperty
{
    public uint mateMaxLevel;
    public float mateDefaultMoveSpeed;
}

[Serializable]
public struct MatePlayerProperty
{
    public static readonly byte _invalidSlotIndex = 0xff;

    public uint id;
    public string levelExp;
    public bool isUnlocked;
    public byte settedSlotIndex;

    public MatePlayerProperty(uint id)
    {
        this.id = id;
        levelExp = BigInteger.Zero.ToString();
        isUnlocked = false;
        settedSlotIndex = _invalidSlotIndex;
    }
}

public class MateData
{
    MateProperty property;
    MatePlayerProperty playerProperty;

    ValueModifier skillDmgModifierPerLevel;

    public MateProperty Property => property;
    public uint ID => property.id;
    public uint Grade => property.grade;
    public IVMate Prefab => property.matePrefab;
    public SkeletonDataAsset SkeletonDataAsset => property.skeletonDataAsset;
    public float DefaultMoveSpeed => MateDataGroup.Instance.GlobalProperty.mateDefaultMoveSpeed;
    public SkillData Skill { get; private set; }
    public string NameKey => FormatString.StringFormat("mate_name_{0}", ID);
    public string GradeLetterImgAtlasPath => GameProperty.Instance.GradeLetterIconDefaultName;
    public string GradeLetterImgNameInAtlas => Grade.ToString();
    public string GradeImgAtlasPath => GameProperty.Instance.GradeIconAtlasName;
    public string GradeImgNameInAtlas => Grade.ToString();
    public string Img2DPath => FormatString.StringFormat("{0}_{1}", GameProperty.Instance.Mate2DImageDefaultName, ID);
    public string ImgFull2DPath => FormatString.StringFormat("{0}_{1}_full", GameProperty.Instance.Mate2DImageDefaultName, ID);
    public string SDImgAtlasPath => GameProperty.Instance.MateSDImageAtlasName;
    public string SDImgNameInAtlas => ID.ToString();
    public static uint MaxLevel => MateDataGroup.Instance.GlobalProperty.mateMaxLevel;
    public uint Level { get; private set; }
    public BigInteger LevelExp { get; private set; }
    public Nationality Nationality => property.nationality;

    public bool IsUnlocked
    {
        get => playerProperty.isUnlocked;
        set
        {
            if (playerProperty.isUnlocked == value) return;
            playerProperty.isUnlocked = value;
        }
    }

    public bool IsSetted => playerProperty.settedSlotIndex != MatePlayerProperty._invalidSlotIndex;
    public int SettedSlotIndex => playerProperty.settedSlotIndex;

    public MateData(MateProperty property, MatePlayerProperty playerProperty)
    {
        this.property = property;
        this.playerProperty = playerProperty;

        LevelExp = BigInteger.Parse(playerProperty.levelExp);
        Level = GetLevelByExp(LevelExp, Grade);

        if (property.skillProperty != null)
        {
            Skill = new SkillData(property.skillProperty);

            var buffGroup = GamePlayBuffMgr.Instance.BuffGroup;

            if (Skill.TryGetStat(StatID.SkillDamage, out var skillDamage))
            {
                skillDmgModifierPerLevel = new ValueModifier(ValueModifier.Type.Flat, 20 * (Level - 1));
                skillDmgModifierPerLevel.From = this;
                skillDamage.AddModifier(skillDmgModifierPerLevel);
            }

            foreach (var buff in buffGroup.GetBuffs(eEffectType.IncMateSkillDmg))
                OnChangeBuff(buff, true);

            foreach (var buff in buffGroup.GetBuffs(eEffectType.DecMateSkillCool))
                OnChangeBuff(buff, true);

            buffGroup.OnChanged += OnChangeBuff;
        }
    }

    private void OnChangeBuff(BuffData buff, bool added)
    {
        if(!buff.SubKey.Match(Property)) return;

        StatData targetStat = null;

        if (buff.Key == eEffectType.DecMateSkillCool)
            Skill.TryGetStat(StatID.CoolTime, out targetStat);
        else if(buff.Key == eEffectType.IncMateSkillDmg)
            Skill.TryGetStat(StatID.SkillDamage, out targetStat);

        if(targetStat != null)
        {
            if (added)
                targetStat.AddModifier(buff.Value);
            else
                targetStat.RemoveModifier(buff.Value);
        }
    }

    public bool AddLevelExp(BigInteger exp)
    {
        LevelExp += exp;
        playerProperty.levelExp = LevelExp.ToString();

        uint prevLevel = Level;
        Level = GetLevelByExp(LevelExp, Grade, Level);
        if (prevLevel != Level)
        {
            if (Skill.TryGetStat(StatID.SkillDamage, out var skillDamage))
            {
                skillDamage.RemoveModifier(skillDmgModifierPerLevel);
                skillDmgModifierPerLevel = new ValueModifier(ValueModifier.Type.Flat, 20 * (Level - 1));
                skillDmgModifierPerLevel.From = this;
                skillDamage.AddModifier(skillDmgModifierPerLevel);
            }

            return true;
        }

        return false;
    }

    public BigInteger GetRequireExpToNextLv() => GetTotalExpToLevel(Level + 1, Grade) - GetTotalExpToLevel(Level, Grade);

    public void SetSlotIndex(int slotIndex)
    {
        if (slotIndex >= GameProperty.Instance.MateMaxCount) return;
        playerProperty.settedSlotIndex = (byte)slotIndex;
    }

    public void RemoveSlotIndex()
    {
        playerProperty.settedSlotIndex = MatePlayerProperty._invalidSlotIndex;
    }

    public static uint GetLevelByExp(BigInteger exp, uint grade, uint offset = 2)
    {
        if (offset < 2)
            offset = 2;

        for (uint i = offset; i <= MaxLevel; i++)
        {
            if (exp < GetTotalExpToLevel(i, grade))
                return i - 1;
        }

        return MaxLevel;
    }

    public static BigInteger GetTotalExpToLevel(uint level, uint grade)
    {
        //TODO : this is temp code
        const uint baseExp = 10000;
        const uint expPerLevel = 100000;

        if (level < 2) return 0;

        float mulRatePerGrade = 2.5f;
        if (grade <= 1) mulRatePerGrade = 1.0f;
        else if (grade == 2) mulRatePerGrade = 1.5f;
        else if (grade == 3) mulRatePerGrade = 2.0f;
        else if (grade == 4) mulRatePerGrade = 2.5f;
        else if (grade == 5) mulRatePerGrade = 3.0f;

        //require exp for next level
        //baseExp + (expPerLevel * (level - 2) * mulRatePerGrade)

        uint a = level - 1;
        uint b = a - 1;

        return (BigInteger)baseExp * a + (BigInteger)(Utility.PermutationAdd(b) * expPerLevel * mulRatePerGrade);
    }

    public static int CompareByID(MateData a, MateData b) => a.ID.CompareTo(b.ID);
    public static int CompareByGrade(MateData a, MateData b) => a.Grade.CompareTo(b.Grade);
    public static int CompareBySettedSlotIndex(MateData a, MateData b) => a.playerProperty.settedSlotIndex.CompareTo(b.playerProperty.settedSlotIndex);
}