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

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

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

    public static readonly TextDefinition CompletionNoticeShort = new TextDefinition(1046258); // Your quest is complete.

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

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

    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 (BaseObjective 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)
    {
      return new MLQuestInstance(this, quester, pm);
    }

    public bool CanOffer(IQuestGiver quester, PlayerMobile pm, bool message)
    {
      return 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;
        }

        MLQuest checkQuest = this;

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

              return false;
            }

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

              return false;
            }
          }

          if (checkQuest.NextQuest == null)
            break;

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

      foreach (BaseObjective 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;

      MLQuestInstance instance = CreateInstance(quester, pm);

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

      OnAccepted(instance);

      foreach (BaseObjectiveInstance 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()
    {
      return TimeSpan.FromSeconds(Utility.Random(1, 5) * 30);
    }

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

    public static void Deserialize(GenericReader reader, int version)
    {
      MLQuest quest = MLQuestSystem.ReadQuestRef(reader);
      int 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)
    {
    }

    #region Generation Methods

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

      IEnumerable<Item> toDelete = map.GetItemsInRange(loc, 0).Where(item => item is Spawner && item.Name == name);

      foreach (Item item in toDelete)
        item.Delete();

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

    public void PutDeco(Item deco, Point3D loc, Map map)
    {
      // Auto cleanup on regeneration
      IEnumerable<Item> toDelete = map.GetItemsInRange(loc, 0).Where(item => item.ItemID == deco.ItemID && item.Z == loc.Z);

      foreach (Item item in toDelete)
        item.Delete();

      deco.MoveToWorld(loc, map);
    }

    #endregion
  }
}