using System.Collections.Generic;
using cfg.SkillCfg;
using Gameplay.Unit;
namespace Gameplay.Character.Helper
{
    public static class CharacterSkillHelper
    {

        /// <summary>
        /// 随机选择指定个数目标
        /// 当数量不满足时,返回全部目标
        /// </summary>
        /// <param name="allTargets"></param>
        /// <param name="count"></param>
        /// <returns></returns>
        private static List<GameUnit> _RandomSelectTargets(List<GameUnit> allTargets,
            int count)
        {
            if (allTargets.Count <= count)
            {
                return allTargets;
            }
            var result = PhxhSDK.Utils.GetRandomElementFromList(allTargets, count);
            return result;
        }

        private static List<GameUnit> _RandomSelectNoFullHpTargets(List<GameUnit> allTargets,
            int count)
        {
            if (allTargets.Count <= count)
            {
                return allTargets;
            }

            var noFullHpTargets = new List<GameUnit>();
            var fullHpTargets = new List<GameUnit>();
            foreach (var target in allTargets)
            {
                if (target.aliveData.currentHp < target.aliveData.maxHp)
                {
                    noFullHpTargets.Add(target);
                }
                else
                {
                    fullHpTargets.Add(target);
                }
            }
            if (noFullHpTargets.Count >= count)
            {
                return _RandomSelectTargets(noFullHpTargets, count);
            }

            var remainCount = count - noFullHpTargets.Count;
            if (fullHpTargets.Count >= remainCount)
            {
                var remainTargets = _RandomSelectTargets(fullHpTargets, remainCount);
                noFullHpTargets.AddRange(remainTargets);
                return noFullHpTargets;
            }

            // 理论上不会走到这里
            return allTargets;
        }

        public static List<GameUnit> RandomSelectTargets(List<GameUnit> allTargets,
            int count,
            ETargetPrefer preferType)
        {
            switch (preferType)
            {
                case ETargetPrefer.None:
                    return _RandomSelectTargets(allTargets, count);
                case ETargetPrefer.PreferNoFullHp:
                    return _RandomSelectNoFullHpTargets(allTargets, count);
                default:
                    DebugUtil.LogError("暂未处理的目标优先类型: {0}", preferType);
                    return new List<GameUnit>();
            }
        }


    }
}