using System.Collections.Generic;
using Server.ContextMenus;
using Server.Items;
using Server.Mobiles;

namespace Server.Engines.Quests
{
  public class TalkEntry : ContextMenuEntry
  {
    private BaseQuester m_Quester;

    public TalkEntry(BaseQuester quester) : base(quester.TalkNumber)
    {
      m_Quester = quester;
    }

    public override void OnClick()
    {
      Mobile from = Owner.From;

      if (from.CheckAlive() && from is PlayerMobile mobile && m_Quester.CanTalkTo(mobile))
        m_Quester.OnTalk(mobile, true);
    }
  }

  public abstract class BaseQuester : BaseVendor
  {
    protected List<SBInfo> m_SBInfos = new List<SBInfo>();

    public BaseQuester(string title = null) : base(title)
    {
    }

    public BaseQuester(Serial serial) : base(serial)
    {
    }

    protected override List<SBInfo> SBInfos => m_SBInfos;

    public override bool IsActiveVendor => false;
    public override bool IsInvulnerable => true;
    public override bool DisallowAllMoves => true;
    public override bool ClickTitle => false;
    public override bool CanTeach => false;

    public virtual int TalkNumber // Talk
      => 6146;

    public override void InitSBInfo()
    {
    }

    public abstract void OnTalk(PlayerMobile player, bool contextMenu);

    public virtual bool CanTalkTo(PlayerMobile to)
    {
      return true;
    }

    public virtual int GetAutoTalkRange(PlayerMobile m)
    {
      return -1;
    }

    public override bool CanBeDamaged()
    {
      return false;
    }

    protected Item SetHue(Item item, int hue)
    {
      item.Hue = hue;
      return item;
    }

    public override void AddCustomContextEntries(Mobile from, List<ContextMenuEntry> list)
    {
      base.AddCustomContextEntries(from, list);

      if (from.Alive && from is PlayerMobile mobile && TalkNumber > 0 && CanTalkTo(mobile))
        list.Add(new TalkEntry(this));
    }

    public override void OnMovement(Mobile m, Point3D oldLocation)
    {
      if (m.Alive && m is PlayerMobile pm)
      {
        int range = GetAutoTalkRange(pm);

        if (pm.Alive && range >= 0 && InRange(m, range) && !InRange(oldLocation, range) && CanTalkTo(pm))
          OnTalk(pm, false);
      }
    }

    public void FocusTo(Mobile to)
    {
      QuestSystem.FocusTo(this, to);
    }

    public static Container GetNewContainer()
    {
      Bag bag = new Bag();
      bag.Hue = QuestSystem.RandomBrightHue();
      return bag;
    }

    public override void Serialize(GenericWriter writer)
    {
      base.Serialize(writer);

      writer.Write(0); // version
    }

    public override void Deserialize(GenericReader reader)
    {
      base.Deserialize(reader);

      int version = reader.ReadInt();
    }
  }
}