using System;
using System.Collections.Generic;
using System.Xml.Serialization;
using System.IO;
using System.Threading.Tasks;

namespace AzerothLibrary
{
    public delegate void Reinforcement(object sender, SupportEventArgs e);
    public class AllianceArmy
    {
        public event Reinforcement WeNeedReinforcement;

        List<IUnit> units;
        public void Add(IUnit unit)
        {
            units.Add(unit);
        }
        public IEnumerable<IUnit> Mages()
        {
            foreach (var unit in units)
                if (unit is Wizard && (unit as Wizard).mana >= 20)
                    yield return unit;
        }
        public IEnumerable<IUnit> Healthy(int hp)
        {
            foreach (var unit in units)
                if (unit.hp >= hp)
                    yield return unit;
        }
        public void SendReinforcement(object sender, SupportEventArgs e)
        {

        }
        public void AskReinforcement(object sender, SupportEventArgs e)
        {
            Console.WriteLine("Asking for reinforcement...");
            ReinforcementJoin(e.path, e.Count);
        }
        public void ReinforcementJoin(string path, int count)
        {
            XmlSerializer xm = new XmlSerializer(typeof(List<IUnit>));
            using (FileStream fs = File.OpenRead(path))
            {
                var newUnits = (List<IUnit>)xm.Deserialize(fs);

                for (int i = 0; i < count; i++)
                {
                    units.Add(newUnits[i]);
                }
            }
        }
    }
}