using SharedLibraryCore.Database.Models;
using SharedLibraryCore.Events;
using System;
using System.Threading;
using System.Threading.Tasks;

namespace SharedLibraryCore
{
    public class GameEvent
    {
        // define what the delagate function looks like
        public delegate void OnServerEventEventHandler(object sender, GameEventArgs e);

        public enum EventFailReason
        {
            /// <summary>
            /// event execution did not fail
            /// </summary>
            None,
            /// <summary>
            /// an internal exception prevented the event
            /// from executing
            /// </summary>
            Exception,
            /// <summary>
            /// event origin didn't have the necessary privileges
            /// to execute the command
            /// </summary>
            Permission,
            /// <summary>
            /// executing the event would cause an invalid state
            /// </summary>
            Invalid,
            /// <summary>
            /// client is doing too much of something
            /// </summary>
            Throttle,
            /// <summary>
            /// the event timed out before completion
            /// </summary>
            Timeout
        }

        public enum EventType
        {
            /// <summary>
            /// the event wasn't parsed properly
            /// </summary>
            Unknown,

            // events "generated" by the server
            /// <summary>
            /// a server started being monitored
            /// </summary>
            Start,
            /// <summary>
            /// a server stopped being monitored
            /// </summary>
            Stop,
            /// <summary>
            /// a client was detecting as connecting via log
            /// </summary>
            Connect,
            /// <summary>
            /// a client was detecting joining by RCon
            /// </summary>
            Join,
            /// <summary>
            /// a client was detected leaving via log
            /// </summary>
            Quit,
            /// <summary>
            /// a client was detected leaving by RCon
            /// </summary>
            Disconnect,
            /// <summary>
            /// the current map ended
            /// </summary>
            MapEnd,
            /// <summary>
            /// the current map changed
            /// </summary>
            MapChange,
            /// <summary>
            /// a client was detected as starting to connect
            /// </summary>
            PreConnect,
            /// <summary>
            /// a client was detecting as starting to disconnect
            /// </summary>
            PreDisconnect,
            /// <summary>
            /// a client's information was updated
            /// </summary>
            Update,
            /// <summary>
            /// connection was lost to a server (the server has not responded after a number of attempts)
            /// </summary>
            ConnectionLost,
            /// <summary>
            /// connection was restored to a server (the server began responding again)
            /// </summary>
            ConnectionRestored,

            // events "generated" by clients  
            /// <summary>
            /// a client sent a message
            /// </summary>
            Say = 100,
            /// <summary>
            /// a client was warned
            /// </summary>
            Warn = 101,
            /// <summary>
            /// all warnings for a client were cleared
            /// </summary>
            WarnClear = 102,
            /// <summary>
            /// a client was reported
            /// </summary>
            Report = 103,
            /// <summary>
            /// a client was flagged
            /// </summary>
            Flag = 104,
            /// <summary>
            /// a client was unflagged
            /// </summary>
            Unflag = 105,
            /// <summary>
            /// a client was kicked
            /// </summary>
            Kick = 106,
            /// <summary>
            /// a client was tempbanned
            /// </summary>
            TempBan = 107,
            /// <summary>
            /// a client was banned
            /// </summary>
            Ban = 108,
            /// <summary>
            /// a client was unbanned
            /// </summary>
            Unban = 109,
            /// <summary>
            /// a client entered a command
            /// </summary>
            Command = 110,
            /// <summary>
            /// a client's permission was changed
            /// </summary>
            ChangePermission = 111,

            // events "generated" by IW4MAdmin
            /// <summary>
            /// a message is sent to all clients
            /// </summary>
            Broadcast = 200,
            /// <summary>
            /// a message is sent to a specific client
            /// </summary>
            Tell = 201,

            // events "generated" by script/log
            /// <summary>
            /// AC Damage Log
            /// </summary>
            ScriptDamage = 300,
            /// <summary>
            /// AC Kill Log
            /// </summary>
            ScriptKill = 301,
            /// <summary>
            /// damage info printed out by game script
            /// </summary>
            Damage = 302,
            /// <summary>
            /// kill info printed out by game script
            /// </summary>
            Kill = 303,
            /// <summary>
            /// team info printed out by game script
            /// </summary>
            JoinTeam = 304,
            /// <summary>
            /// used for community generated plugin events
            /// </summary>
            Other
        }

        [Flags]
        public enum EventRequiredEntity
        {
            None = 1,
            Origin = 2,
            Target = 4
        }

        static long NextEventId;
        static long GetNextEventId()
        {
            return Interlocked.Increment(ref NextEventId);
        }

        public GameEvent()
        {
            OnProcessed = new ManualResetEventSlim(false);
            Time = DateTime.UtcNow;
            Id = GetNextEventId();
        }

        public EventType Type;
        public EventRequiredEntity RequiredEntity { get; set; }
        public string Data; // Data is usually the message sent by player
        public string Message;
        public EFClient Origin;
        public EFClient Target;
        public Server Owner;
        public bool IsRemote { get; set; } = false;
        public object Extra { get; set; }
        public ManualResetEventSlim OnProcessed { get; set; }
        public DateTime Time { get; set; }
        public long Id { get; private set; }
        public EventFailReason FailReason { get; set; }
        public bool Failed => FailReason != EventFailReason.None;
        /// <summary>
        /// Indicates if the event should block until it is complete
        /// </summary>
        public bool IsBlocking { get; set; }

        /// <summary>
        /// asynchronously wait for GameEvent to be processed
        /// </summary>
        /// <returns>waitable task </returns>
        public Task<GameEvent> WaitAsync(TimeSpan timeSpan, CancellationToken token)
        {
            return Task.Run(() =>
            {
                bool processed = OnProcessed.Wait(timeSpan, token);
                // this let's us know if the the action timed out
                FailReason = FailReason == EventFailReason.None & !processed ? EventFailReason.Timeout : FailReason; 
                return this;
            });
        }

        public GameEvent Wait()
        {
            OnProcessed.Wait();
            return this;
        }
    }
}