ModernUO/Projects/UOContent/Engines/XMLSpawner/XmlSpawnerSkillCheck.cs

using System.Collections;
using Server.Items;
using CPA = Server.CommandPropertyAttribute;
using Server.Misc;

namespace Server.Mobiles;

public class XmlSpawnerSkillCheck
{
    // alternate skillcheck hooks to replace those in SkillCheck.cs
    public static bool Mobile_SkillCheckLocation(Mobile from, SkillName skillName, double minSkill, double maxSkill)
    {
        var skill = from.Skills[skillName];

        if (skill == null)
        {
            return false;
        }

        // call the default skillcheck handler
        var success = SkillCheck.Mobile_SkillCheckLocation( from,  skillName,  minSkill,  maxSkill);

        // call the xmlspawner skillcheck handler
        CheckSkillUse(from, skill, success);

        return success;
    }

    public static bool Mobile_SkillCheckDirectLocation(Mobile from, SkillName skillName, double chance)
    {
        var skill = from.Skills[skillName];

        if (skill == null)
        {
            return false;
        }

        // call the default skillcheck handler
        var success = SkillCheck.Mobile_SkillCheckDirectLocation( from,  skillName,  chance);

        // call the xmlspawner skillcheck handler
        CheckSkillUse(from, skill, success);

        return success;
    }

    public static bool Mobile_SkillCheckTarget(Mobile from, SkillName skillName, object target, double minSkill, double maxSkill)
    {
        var skill = from.Skills[skillName];

        if (skill == null)
        {
            return false;
        }

        // call the default skillcheck handler
        var success = SkillCheck.Mobile_SkillCheckTarget( from,  skillName,  target,  minSkill,  maxSkill);

        // call the xmlspawner skillcheck handler
        CheckSkillUse(from, skill, success);

        return success;
    }

    public static bool Mobile_SkillCheckDirectTarget(Mobile from, SkillName skillName, object target, double chance)
    {
        var skill = from.Skills[skillName];

        if (skill == null)
        {
            return false;
        }

        // call the default skillcheck handler
        var success = SkillCheck.Mobile_SkillCheckDirectTarget( from,  skillName,  target,  chance);

        // call the xmlspawner skillcheck handler
        CheckSkillUse(from, skill, success);

        return success;
    }


    public class RegisteredSkill
    {
        public const int MaxSkills = 52;
        public const SkillName Invalid = (SkillName)(-1);

        public object  target;
        public SkillName   sid;

        // note the extra skill MaxSkills +1 is used for any unknown skill that falls outside of the known 52
        private static ArrayList[] m_FeluccaSkillList = new ArrayList[MaxSkills+1];
        private static ArrayList[] m_TrammelSkillList = new ArrayList[MaxSkills+1];
        private static ArrayList[] m_MalasSkillList = new ArrayList[MaxSkills+1];
        private static ArrayList[] m_IlshenarSkillList = new ArrayList[MaxSkills+1];
        private static ArrayList[] m_TokunoSkillList = new ArrayList[MaxSkills+1];

        // primary function that returns the list of objects (spawners) that are associated with a given skillname by map
        public static ArrayList TriggerList(SkillName index, Map map)
        {
            if (map == null || map == Map.Internal)
            {
                return null;
            }

            ArrayList[] maplist;

            // get the list for the specified map

            if (map == Map.Felucca)
            {
                maplist = m_FeluccaSkillList;
            }
            else if (map == Map.Ilshenar)
            {
                maplist = m_IlshenarSkillList;
            }
            else if (map == Map.Malas)
            {
                maplist = m_MalasSkillList;
            }
            else if (map == Map.Trammel)
            {
                maplist = m_TrammelSkillList;
            }
            else if (map == Map.Tokuno)
            {
                maplist = m_TokunoSkillList;
            }
            else
            {
                return null;
            }

            // is it one of the standard 52 skills
            if ((int)index >= 0 && (int)index < MaxSkills)
            {
                return maplist[(int)index] ??= new ArrayList();
            }

            // otherwise pull it out of the final slot for unknown skills.  I dont know of a condition that would lead to
            // additional skills being registered but it will support them if they are
            return maplist[MaxSkills] ??= new ArrayList();
        }
    }

    public static void RegisterSkillTrigger(object o, SkillName s, Map map)
    {
        if (o == null || s == RegisteredSkill.Invalid)
        {
            return;
        }

        // go through the list and if the spawner is not on it yet, then add it
        var found = false;

        var skilllist = RegisteredSkill.TriggerList(s, map);

        if (skilllist == null)
        {
            return;
        }

        foreach(RegisteredSkill rs in skilllist)
        {
            if (rs.target == o && rs.sid == s)
            {
                found = true;
                // dont register a skill if it is already on the list for this spawner
                break;
            }
        }

        // if it hasnt already been added to the list, then add it
        if (!found)
        {
            var newrs = new RegisteredSkill();
            newrs.target = o;
            newrs.sid = s;

            skilllist.Add(newrs);

        }
    }

    public static void UnRegisterSkillTrigger(object o, SkillName s, Map map, bool all)
    {
        if (o == null || s == RegisteredSkill.Invalid)
        {
            return;
        }

        // go through the list and if the spawner is on it regardless of the skill registered, then remove it
        if (all)
        {
            for(var i = 0;i<RegisteredSkill.MaxSkills+1;i++)
            {
                var skilllist = RegisteredSkill.TriggerList((SkillName)i, map);

                if (skilllist == null)
                {
                    return;
                }

                foreach(RegisteredSkill rs in skilllist)
                {
                    if (rs.target == o)
                    {
                        skilllist.Remove(rs);
                        break;
                    }

                }
            }
        }
        else
        {
            var skilllist = RegisteredSkill.TriggerList(s, map);

            if (skilllist == null)
            {
                return;
            }

            // if the all flag is not set then just remove the spawner from the list for the specified skill
            foreach(RegisteredSkill rs in skilllist)
            {
                if (rs.target == o && rs.sid == s)
                {
                    skilllist.Remove(rs);
                    break;
                }

            }
        }
    }

    // determines whether  XmlSpawner, XmlAttachment, or XmlQuest OnSkillUse methods should be invoked.
    public static void CheckSkillUse(Mobile m, Skill skill, bool success)
    {
        if (!(m is PlayerMobile) || skill == null)
        {
            return;
        }

        /*
        // first check for any attachments that might support OnSkillUse
        ArrayList list = XmlAttach.FindAttachments(m);
        if (list != null && list.Count > 0)
        {
            foreach(XmlAttachment a in list)
            {
                if (a != null && !a.Deleted && a.HandlesOnSkillUse)
                {
                    a.OnSkillUse(m, skill, success);
                }
            }
        }
        */

        // then check for registered skills
        var skilllist = RegisteredSkill.TriggerList(skill.SkillName, m.Map);

        if (skilllist == null)
        {
            return;
        }

        // determine whether there are any registered objects for this skill
        foreach(RegisteredSkill rs in skilllist)
        {
            // if so then invoke their skill handlers
            // call the spawner handler
            if (rs.sid == skill.SkillName && rs.target is XmlSpawner spawner && spawner.HandlesOnSkillUse)
            {
                spawner.OnSkillUse(m, skill, success);
            }
        }
    }

}