using System.Collections.Generic;
using Skill_V2;
using UnityEngine;

public class SkillData : IHasBuff
{
    SkillProperty property;

    StatGroup statGroup;
    BuffData[] buffs;

    public uint ID => property.id;
    public Skill Prefab => property.skillPrefab;
    public IReadOnlyList<SkillSequence> Sequences => property.sequences;
    public string NameKey => FormatString.StringFormat("skill_name_{0}", ID);
    public string DescriptionKey => FormatString.StringFormat("skill_desc_{0}", ID);
    public string IconImgAtlasName => GameProperty.Instance.SkillIconAtlasName;
    public string IconImgNameInAtlas => (2000 + ID).ToString();
    public IReadOnlyList<BuffData> Buffs => buffs;

    public SkillData(SkillProperty property)
    {
        this.property = property;

        statGroup = new StatGroup(property.stats);

        buffs = new BuffData[property._buffs.Length];
        for (int i = 0; i < property._buffs.Length; i++)
        {
            buffs[i] = new BuffData(property._buffs[i], this);
        }
    }

    public bool TryGetStat(uint id, out StatData stat) => statGroup.TryGetStat(id, out stat);
    public bool TryGetStat(StatID id, out StatData stat) => TryGetStat((uint)id, out stat);
    public bool TryGetBuff(string nameKey, out BuffData buff) => buffs.TryFind(x => x.NameKey == nameKey, out buff);

    /// <summary>
    /// stat.{statID}은 스탯의 이름을 표시합니다.
    /// buff.{buffName}.{property}은 버프의 속성을 표시합니다.
    /// buff.{buffName}.effect.{index}.{property}은 버프의 효과의 속성을 표시합니다.
    /// </summary>
    public string GetSkillDesc()
    {
        string descFormat = LocalizationInjector.InjectLocalization(LocalizationInjector.MakeToLocalizationKey(DescriptionKey));

        string result = string.Empty;
        for(int i = 0; i < descFormat.Length; i++)
        {
            char c = descFormat[i];

            if (c == '{')
            {
                string keyword = string.Empty;
                while(++i < descFormat.Length && descFormat[i] != '}')
                {
                    keyword += descFormat[i];
                }

                var values = keyword.Split('.');
                Debug.Assert(values.Length > 0, "Invalid skill desc");

                if (values[0] == "stat")
                {
                    Debug.Assert(values.Length > 1, "Invalid skill desc");
                    if (statGroup.TryGetStatByName(values[1], out StatData stat))
                    {
                        result += stat.ToString();
                    }
                }
                else if (values[0] == "buff")
                {
                    Debug.Assert(values.Length > 2, "Invalid skill desc");

                    var key = values[1];
                    if (TryGetBuff(key, out BuffData buff))
                    {
                        if (values[2] == "duration")
                        {
                            result += buff.Duration.ToString("F2");
                        }
                        else if (values[2] == "effect")
                        {
                            Debug.Assert(values.Length > 4, "Invalid skill desc");

                            var index = int.Parse(values[3]);
                            if (values[4] == "value")
                            {
                                result += buff.Effects[index].Value; 
                            }
                            else if (values[4] == "name")
                            {
                                result += LocalizationText.GetText(buff.Effects[index].NameKey);
                            }
                        }
                    }
                }
            }
            else
            {
                result += descFormat[i];
            }
        }

        return result;
    }
}