using System;
using System.Text.Json;
using Server.Json;
using Server.Mobiles;

namespace Server.Engines.Spawners
{
    public class ProximitySpawner : Spawner
    {
        [Constructible(AccessLevel.Developer)]
        public ProximitySpawner()
        {
        }

        [Constructible(AccessLevel.Developer)]
        public ProximitySpawner(string spawnName)
            : base(spawnName)
        {
        }

        [Constructible(AccessLevel.Developer)]
        public ProximitySpawner(int amount, int minDelay, int maxDelay, int team, int homeRange, string spawnName)
            : base(amount, minDelay, maxDelay, team, homeRange, spawnName)
        {
        }

        [Constructible(AccessLevel.Developer)]
        public ProximitySpawner(
            int amount, int minDelay, int maxDelay, int team, int homeRange, int triggerRange,
            string spawnMessage, bool instantFlag, string spawnName
        )
            : base(amount, minDelay, maxDelay, team, homeRange, spawnName)
        {
            TriggerRange = triggerRange;
            SpawnMessage = TextDefinition.Parse(spawnMessage);
            InstantFlag = instantFlag;
        }

        [Constructible(AccessLevel.Developer)]
        public ProximitySpawner(
            int amount, TimeSpan minDelay, TimeSpan maxDelay, int team, int homeRange,
            params string[] spawnedNames
        )
            : base(amount, minDelay, maxDelay, team, homeRange, spawnedNames)
        {
        }

        [Constructible(AccessLevel.Developer)]
        public ProximitySpawner(
            int amount, TimeSpan minDelay, TimeSpan maxDelay, int team, int homeRange, int triggerRange,
            TextDefinition spawnMessage, bool instantFlag, params string[] spawnedNames
        )
            : base(amount, minDelay, maxDelay, team, homeRange, spawnedNames)
        {
            TriggerRange = triggerRange;
            SpawnMessage = spawnMessage;
            InstantFlag = instantFlag;
        }

        public ProximitySpawner(DynamicJson json, JsonSerializerOptions options) : base(json, options)
        {
            json.GetProperty("triggerRange", options, out int triggerRange);
            json.GetProperty("spawnMessage", options, out TextDefinition spawnMessage);
            json.GetProperty("instant", options, out bool instant);

            TriggerRange = triggerRange;
            SpawnMessage = spawnMessage;
            InstantFlag = instant;
        }

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

        [CommandProperty(AccessLevel.Developer)]
        public int TriggerRange { get; set; }

        [CommandProperty(AccessLevel.Developer)]
        public TextDefinition SpawnMessage { get; set; }

        [CommandProperty(AccessLevel.Developer)]
        public bool InstantFlag { get; set; }

        public override string DefaultName => "Proximity Spawner";

        public override bool HandlesOnMovement => true;

        public override void DoTimer(TimeSpan delay)
        {
            if (!Running)
            {
                return;
            }

            End = Core.Now + delay;
        }

        public override void Respawn()
        {
            RemoveSpawns();

            End = Core.Now;
        }

        public virtual bool ValidTrigger(Mobile m)
        {
            if (m is BaseCreature bc && (bc.IsDeadBondedPet || !(bc.Controlled || bc.Summoned)))
            {
                return false;
            }

            return m.AccessLevel == AccessLevel.Player && (m.Player || m.Alive && !m.Hidden && m.CanBeDamaged());
        }

        public override void OnMovement(Mobile m, Point3D oldLocation)
        {
            if (!Running)
            {
                return;
            }

            if (IsEmpty && End <= Core.Now && m.InRange(GetWorldLocation(), TriggerRange) &&
                m.Location != oldLocation && ValidTrigger(m))
            {
                TextDefinition.SendMessageTo(m, SpawnMessage);

                DoTimer();
                Spawn();

                if (InstantFlag)
                {
                    foreach (var spawned in Spawned.Keys)
                    {
                        if (spawned is Mobile mobile)
                        {
                            mobile.Combatant = m;
                        }
                    }
                }
            }
        }

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

            writer.WriteEncodedInt(0); // version

            writer.Write(TriggerRange);
            TextDefinition.Serialize(writer, SpawnMessage);
            writer.Write(InstantFlag);
        }

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

            var version = reader.ReadEncodedInt();

            TriggerRange = reader.ReadInt();
            SpawnMessage = TextDefinition.Deserialize(reader);
            InstantFlag = reader.ReadBool();
        }
    }
}