using HISP.Player;
using HISP.Server;
using System.Collections.Generic;


namespace HISP.Game
{
    public class Npc
    {
        public struct NpcReply
        {
            public int Id;
            public string ReplyText;
            public int GotoChatpoint;
            public int RequiresQuestIdCompleted;
            public int RequiresQuestIdNotCompleted;
        }
        public struct NpcChat
        {
            public int Id;
            public string ChatText;
            public int ActivateQuestId;

            public NpcReply[] Replies;
        }
        public class NpcEntry
        {
            public int Id;
            public string Name;
            public string AdminDescription;
            public string ShortDescription;
            public string LongDescription;
            public bool Moves;
            public int X;
            public int Y;
            public string StayOn;
            public int RequiresQuestIdCompleted;
            public int RequiresQuestIdNotCompleted;
            public string UDLRScript;
            public int UDLRStartX;
            public int UDLRStartY;
            public bool AdminOnly;
            public bool LibarySearchable;
            public int IconId;

            private int udlrScriptPos = 0;

            private bool canNpcBeHere(int x, int y)
            {
                // Horses cannot be in towns.
                if (World.InTown(x, y))
                    return false;
                if (World.InSpecialTile(x, y))
                    return false;

                // Check Tile Type
                int TileID = Map.GetTileId(x, y, false);
                string TileType = Map.TerrainTiles[TileID - 1].Type;
                if (TileType != this.StayOn)
                    return false;

                if (Map.CheckPassable(x, y)) // Can the player stand over here?
                    return true;

                return false;
            }
            public void RandomWander()
            {
                if(Moves)
                {
                    if(UDLRStartX == 0 && UDLRStartY == 0) // not scripted.
                    {
                        if (GameServer.GetUsersAt(this.X, this.Y, true, true).Length > 0)
                            return;

                        int direction = GameServer.RandomNumberGenerator.Next(0, 3);
                        int tryX = this.X;
                        int tryY = this.Y;

                        switch (direction)
                        {
                            case 0:
                                tryX += 1;
                                break;
                            case 1:
                                tryX -= 1;
                                break;
                            case 2:
                                tryY += 1;
                                break;
                            case 3:
                                tryY -= 1;
                                break;
                        }

                        if (canNpcBeHere(tryX, tryY))
                        {
                            X = tryX;
                            Y = tryY;
                        }
                    }
                    else // Is Scripted.
                    {

                        X = UDLRStartX;
                        Y = UDLRStartY;
                        for(int i = 0; i < udlrScriptPos; i++)
                        {
                            
                            switch (UDLRScript.ToLower()[i])
                            {
                                case 'u':
                                    Y++;
                                    break;
                                case 'd':
                                    Y--;
                                    break;
                                case 'l':
                                    X--;
                                    break;
                                case 'r':
                                    X++;
                                    break;
                            }
                        }

                        udlrScriptPos++;

                        if (udlrScriptPos > UDLRScript.Length)
                            udlrScriptPos = 0;
                    }
                }
            }

            public NpcChat[] Chatpoints;
        }

        public static List<NpcEntry> NpcList = new List<NpcEntry>();

        public static NpcReply GetNpcReply(NpcEntry npc, int id)
        {

            foreach (NpcChat chatpoint in npc.Chatpoints)
            {
                foreach (NpcReply reply in chatpoint.Replies)
                {
                    if (reply.Id == id)
                        return reply;
                }
            }
            throw new KeyNotFoundException("Npc reply with " + id + " not found!");
        }

        public static NpcReply GetNpcReply(NpcChat chatpoint, int id)
        {
            foreach(NpcReply reply in chatpoint.Replies)
            {
                if (reply.Id == id)
                    return reply;
            }
            throw new KeyNotFoundException("Npc reply with " + id + " not found!");
        }
        public static NpcChat GetNpcChatpoint(NpcEntry npc, int chatpointId)
        {
            foreach(Npc.NpcChat chatpoint in npc.Chatpoints)
            {
                if(chatpoint.Id == chatpointId)
                {
                    return chatpoint;
                }
            }

            return npc.Chatpoints[0];
        }

        public static int GetDefaultChatpoint(User user, NpcEntry npc)
        {
            if (Database.HasNpcStartpointSet(user.Id, npc.Id))
                return Database.GetNpcStartPoint(user.Id, npc.Id);
            else
                return 0;
        }

        public static void SetDefaultChatpoint(User user, NpcEntry npc, int chatpointId)
        {
            if (Database.HasNpcStartpointSet(user.Id, npc.Id))
                Database.SetNpcStartPoint(user.Id, npc.Id, chatpointId);
            else
                Database.AddNpcStartPoint(user.Id, npc.Id, chatpointId);
        }


        public static bool NpcExists(int id)
        {
            try
            {
                GetNpcById(id);
                return true;
            }
            catch (KeyNotFoundException)
            {
                return false;
            }
        }
        public static NpcEntry GetNpcById(int id)
        {
            foreach(NpcEntry npc in NpcList)
            {
                if (npc.Id == id)
                    return npc;
            }
            throw new KeyNotFoundException("Npc id: " + id + " not found!");
        }

        public static void WanderNpcs()
        {
            Logger.DebugPrint("Making NPC's randomly wander.");
            foreach(NpcEntry npc in NpcList)
            {
                if(GameServer.RandomNumberGenerator.Next(0,100) > 50)
                    npc.RandomWander();
            }
        }

        public static NpcEntry[] GetNpcByXAndY(int x, int y)
        {
            List<NpcEntry> npcs = new List<NpcEntry>();

            foreach(NpcEntry npc in NpcList)
            {
                if (npc.X == x && npc.Y == y)
                    npcs.Add(npc);
            }
            return npcs.ToArray();
        }

    }
}