using System;
using System.Collections.Generic;
using Server.Collections;
using Server.Engines.MLQuests.Gumps;
using Server.Engines.MLQuests.Objectives;
using Server.Engines.MLQuests.Rewards;
using Server.Engines.Spawners;
using Server.Gumps;
using Server.Mobiles;

namespace Server.Engines.MLQuests
{
    public enum ObjectiveType
    {
        All,
        Any
    }

    public class MLQuest
    {
        // You've completed a quest!  Don't forget to collect your reward.
        public static TextDefinition CompletionNoticeDefault = 1072273;

        public static TextDefinition CompletionNoticeShort = 1046258; // Your quest is complete.

        // Your quest is complete. Return for your reward.
        public static TextDefinition CompletionNoticeShortReturn = 1073775;

        // You obtained what you seek, now receive your reward.
        public static TextDefinition CompletionNoticeCraft = 1073967;

        public MLQuest()
        {
            Activated = false;
            Objectives = new List<BaseObjective>();
            ObjectiveType = ObjectiveType.All;
            Rewards = new List<BaseReward>();
            CompletionNotice = CompletionNoticeDefault;

            Instances = new List<MLQuestInstance>();

            SaveEnabled = true;
        }

        public bool Deserialized { get; set; }

        public bool SaveEnabled { get; set; }

        // TODO: Flags? (Deserialized, SaveEnabled, Activated)

        public bool Activated { get; set; }

        public List<BaseObjective> Objectives { get; set; }

        public ObjectiveType ObjectiveType { get; set; }

        public List<BaseReward> Rewards { get; set; }

        public List<MLQuestInstance> Instances { get; set; }

        public bool OneTimeOnly { get; set; }

        public bool HasRestartDelay { get; set; }

        public bool IsEscort => HasObjective<EscortObjective>();

        public bool IsSkillTrainer => HasObjective<GainSkillObjective>();

        public bool RequiresCollection => HasObjective<CollectObjective>() || HasObjective<DeliverObjective>();

        public virtual bool RecordCompletion => OneTimeOnly || HasRestartDelay;

        public virtual bool IsChainTriggered => false;
        public virtual Type NextQuest => null;

        public TextDefinition Title { get; set; }

        public TextDefinition Description { get; set; }

        public TextDefinition RefusalMessage { get; set; }

        public TextDefinition InProgressMessage { get; set; }

        public TextDefinition CompletionMessage { get; set; }

        public TextDefinition CompletionNotice { get; set; }

        public virtual int Version => 0;

        public bool HasObjective<T>() where T : BaseObjective
        {
            foreach (var obj in Objectives)
            {
                if (obj is T)
                {
                    return true;
                }
            }

            return false;
        }

        public virtual void Generate()
        {
            if (MLQuestSystem.Debug)
            {
                Console.WriteLine("INFO: Generating quest: {0}", GetType());
            }
        }

        public MLQuestInstance CreateInstance(IQuestGiver quester, PlayerMobile pm) =>
            new(this, quester, pm);

        public bool CanOffer(IQuestGiver quester, PlayerMobile pm, bool message) =>
            CanOffer(quester, pm, MLQuestSystem.GetContext(pm), message);

        public virtual bool CanOffer(IQuestGiver quester, PlayerMobile pm, MLQuestContext context, bool message)
        {
            if (!Activated || quester.Deleted)
            {
                return false;
            }

            if (context != null)
            {
                if (context.IsFull)
                {
                    if (message)
                    {
                        MLQuestSystem.Tell(quester, pm, 1080107); // I'm sorry, I have nothing for you at this time.
                    }

                    return false;
                }

                var checkQuest = this;

                while (checkQuest != null)
                {
                    if (context.HasDoneQuest(checkQuest, out var nextAvailable))
                    {
                        if (checkQuest.OneTimeOnly)
                        {
                            if (message)
                            {
                                MLQuestSystem.Tell(quester, pm, 1075454); // I cannot offer you the quest again.
                            }

                            return false;
                        }

                        if (nextAvailable > Core.Now)
                        {
                            if (message)
                            {
                                // I'm sorry, but I don't have anything else for you right now.
                                // Could you check back with me in a few minutes?
                                MLQuestSystem.Tell(quester, pm, 1075575);
                            }

                            return false;
                        }
                    }

                    if (checkQuest.NextQuest == null)
                    {
                        break;
                    }

                    checkQuest = MLQuestSystem.FindQuest(checkQuest.NextQuest);
                }
            }

            foreach (var obj in Objectives)
            {
                if (!obj.CanOffer(quester, pm, message))
                {
                    return false;
                }
            }

            return true;
        }

        public virtual void SendOffer(IQuestGiver quester, PlayerMobile pm)
        {
            pm.SendGump(new QuestOfferGump(this, quester, pm));
        }

        public virtual void OnAccept(IQuestGiver quester, PlayerMobile pm)
        {
            if (!CanOffer(quester, pm, true))
            {
                return;
            }

            var instance = CreateInstance(quester, pm);

            pm.SendLocalizedMessage(1049019); // You have accepted the Quest.
            pm.SendSound(0x2E7);              // private sound

            OnAccepted(instance);

            foreach (var obj in instance.Objectives)
            {
                obj.OnQuestAccepted();
            }
        }

        public virtual void OnAccepted(MLQuestInstance instance)
        {
        }

        public virtual void OnRefuse(IQuestGiver quester, PlayerMobile pm)
        {
            pm.SendGump(new QuestConversationGump(this, pm, RefusalMessage));
        }

        public virtual void GetRewards(MLQuestInstance instance)
        {
            instance.SendRewardGump();
        }

        public virtual void OnRewardClaimed(MLQuestInstance instance)
        {
        }

        public virtual void OnCancel(MLQuestInstance instance)
        {
        }

        public virtual void OnQuesterDeleted(MLQuestInstance instance)
        {
        }

        public virtual void OnPlayerDeath(MLQuestInstance instance)
        {
        }

        public virtual TimeSpan GetRestartDelay() => TimeSpan.FromSeconds(Utility.Random(1, 5) * 30);

        public static void Serialize(IGenericWriter writer, MLQuest quest)
        {
            MLQuestSystem.WriteQuestRef(writer, quest);
            writer.Write(quest.Version);
        }

        public static void Deserialize(IGenericReader reader, int version)
        {
            var quest = MLQuestSystem.ReadQuestRef(reader);
            var oldVersion = reader.ReadInt();

            if (quest == null)
            {
                return; // not saved or no longer exists
            }

            quest.Refresh(oldVersion);
            quest.Deserialized = true;
        }

        public virtual void Refresh(int oldVersion)
        {
        }

        public void PutSpawner(Spawner s, Point3D loc, Map map)
        {
            var name = $"MLQS-{GetType().Name}";

            using var queue = PooledRefQueue<Item>.Create();
            foreach (var item in map.GetItemsAt(loc))
            {
                // This predates GUIDs. Let's build these spawners and export them so we can delete this code!
                if (item is BaseSpawner spawner && spawner.Name == name)
                {
                    queue.Enqueue(item);
                }
            }

            while (queue.Count > 0)
            {
                queue.Dequeue().Delete();
            }

            s.Name = name;
            s.MoveToWorld(loc, map);
        }

        public static void PutDeco(Item deco, Point3D loc, Map map)
        {
            using var queue = PooledRefQueue<Item>.Create();
            foreach (var item in map.GetItemsAt(loc))
            {
                if (item.ItemID == deco.ItemID && item.Z == loc.Z)
                {
                    queue.Enqueue(item);
                }
            }

            while (queue.Count > 0)
            {
                queue.Dequeue().Delete();
            }

            deco.MoveToWorld(loc, map);
        }
    }
}