using Cal;
using System;
using System.Collections.Generic;

namespace ET
{
    public static class SelectTargetHelper
    {
        /// <summary>
        /// 选取可以攻击的目标
        /// </summary>
        public static void SelectUnitByFlags(List<Unit> sourceList, List<Unit> retList, TargetFlagType flags)
        {
            retList.Clear();
            if (sourceList == null || sourceList.Count == 0)
                return;
            foreach (Unit u in sourceList)
            {
                if (IsValid(u, flags))
                    retList.Add(u);
            }

        }

        private static bool IsValid(Unit unit, TargetFlagType flags)
        {
            if (flags.HasFlag(TargetFlagType.死亡的))
            {
                if (!unit.IsAlive)
                {
                    return false;
                }
            }
            if (flags.HasFlag(TargetFlagType.无敌的))
            {

            }
            if (flags.HasFlag(TargetFlagType.隐身的))
            {

            }
            if (flags.HasFlag(TargetFlagType.免疫控制的))
            {

            }
            if (flags.HasFlag(TargetFlagType.召唤的))
            {

            }
            return true;
        }
        public static void GetTarget(SelectTargetBase selectTarget, ISkillSender skillSender, Action<Unit, ISkillSender> action)
        {
            TargetableUnitBase targetBase = null;
            switch (selectTarget)
            {
                default:
                    break;
                case SelectSingleTarget singleTarget:
                    targetBase = singleTarget.GetTarget(skillSender);
                    break;
                case SelectMultiTarget selectMultiTarget:
                    targetBase = selectMultiTarget.GetTarget(skillSender);
                    break;
            }

            if (!targetBase) return;
            if (targetBase is TargetableSingleUnit singleUnit)
            {
                Unit target = singleUnit.target;
                if (!target)
                {
                    Log.ErrorDetail($"单体目标为空 {skillSender}");
                    targetBase.Dispose();
                    return;
                }
                action?.Invoke(target, skillSender);
            }
            else if (targetBase is TargetableMultiUnit multiUnit)
            {
                List<Unit> targetList = multiUnit.targetList;
                if (targetList == null)
                {
                    Log.ErrorDetail($"多个目标为空 {skillSender}");
                    targetBase.Dispose();
                    return;
                }
                foreach (Unit target in targetList)
                {
                    action?.Invoke(target, skillSender);
                }
            }
            targetBase.Dispose();
        }
    }
}