/*************************************************************************
 * ModernUO                                                              *
 * Copyright (C) 2019-2021 - ModernUO Development Team                   *
 * Email: hi@modernuo.com                                                *
 * File: Timer.DelayCall.cs                                              *
 *                                                                       *
 * This program is free software: you can redistribute it and/or modify  *
 * it under the terms of the GNU General Public License as published by  *
 * the Free Software Foundation, either version 3 of the License, or     *
 * (at your option) any later version.                                   *
 *                                                                       *
 * You should have received a copy of the GNU General Public License     *
 * along with this program.  If not, see <http://www.gnu.org/licenses/>. *
 *************************************************************************/

using System;

namespace Server
{
    public delegate void TimerCallback();

    public delegate void TimerStateCallback<in T>(T state);

    public delegate void TimerStateCallback<in T1, in T2>(T1 t1, T2 t2);

    public delegate void TimerStateCallback<in T1, in T2, in T3>(T1 t1, T2 t2, T3 t3);

    public delegate void TimerStateCallback<in T1, in T2, in T3, in T4>(T1 t1, T2 t2, T3 t3, T4 t4);

    public partial class Timer
    {
        private static string FormatDelegate(Delegate callback) =>
            callback == null ? "null" : $"{callback.Method.DeclaringType?.FullName ?? ""}.{callback.Method.Name}";

        public static Timer DelayCall(TimerCallback callback) => DelayCall(TimeSpan.Zero, TimeSpan.Zero, 1, callback);

        public static Timer DelayCall(TimeSpan delay, TimerCallback callback) =>
            DelayCall(delay, TimeSpan.Zero, 1, callback);

        public static Timer DelayCall(TimeSpan delay, TimeSpan interval, TimerCallback callback) =>
            DelayCall(delay, interval, 0, callback);

        public static Timer DelayCall(TimeSpan delay, TimeSpan interval, int count, TimerCallback callback)
        {
            Timer t = new DelayCallTimer(delay, interval, count, callback);
            t.Start();

            return t;
        }

        public static Timer DelayCall<T>(TimerStateCallback<T> callback, T state) =>
            DelayCall(TimeSpan.Zero, TimeSpan.Zero, 1, callback, state);

        public static Timer DelayCall<T>(TimeSpan delay, TimerStateCallback<T> callback, T state) =>
            DelayCall(delay, TimeSpan.Zero, 1, callback, state);

        public static Timer DelayCall<T>(TimeSpan delay, TimeSpan interval, TimerStateCallback<T> callback, T state) =>
            DelayCall(delay, interval, 0, callback, state);

        public static Timer DelayCall<T>(
            TimeSpan delay, TimeSpan interval, int count, TimerStateCallback<T> callback,
            T state
        )
        {
            Timer t = new DelayStateCallTimer<T>(delay, interval, count, callback, state);
            t.Start();

            return t;
        }

        public static Timer DelayCall<T1, T2>(TimerStateCallback<T1, T2> callback, T1 t1, T2 t2) =>
            DelayCall(TimeSpan.Zero, TimeSpan.Zero, 1, callback, t1, t2);

        public static Timer DelayCall<T1, T2>(TimeSpan delay, TimerStateCallback<T1, T2> callback, T1 t1, T2 t2) =>
            DelayCall(delay, TimeSpan.Zero, 1, callback, t1, t2);

        public static Timer DelayCall<T1, T2>(
            TimeSpan delay, TimeSpan interval, TimerStateCallback<T1, T2> callback,
            T1 t1, T2 t2
        ) => DelayCall(delay, interval, 0, callback, t1, t2);

        public static Timer DelayCall<T1, T2>(
            TimeSpan delay, TimeSpan interval, int count, TimerStateCallback<T1, T2> callback,
            T1 t1, T2 t2
        )
        {
            Timer t = new DelayStateCallTimer<T1, T2>(delay, interval, count, callback, t1, t2);
            t.Start();

            return t;
        }

        public static Timer DelayCall<T1, T2, T3>(TimerStateCallback<T1, T2, T3> callback, T1 t1, T2 t2, T3 t3) =>
            DelayCall(TimeSpan.Zero, TimeSpan.Zero, 1, callback, t1, t2, t3);

        public static Timer DelayCall<T1, T2, T3>(
            TimeSpan delay, TimerStateCallback<T1, T2, T3> callback, T1 t1, T2 t2, T3 t3
        ) =>
            DelayCall(delay, TimeSpan.Zero, 1, callback, t1, t2, t3);

        public static Timer DelayCall<T1, T2, T3>(
            TimeSpan delay, TimeSpan interval, TimerStateCallback<T1, T2, T3> callback,
            T1 t1, T2 t2, T3 t3
        ) => DelayCall(delay, interval, 0, callback, t1, t2, t3);

        public static Timer DelayCall<T1, T2, T3>(
            TimeSpan delay, TimeSpan interval, int count,
            TimerStateCallback<T1, T2, T3> callback, T1 t1, T2 t2, T3 t3
        )
        {
            Timer t = new DelayStateCallTimer<T1, T2, T3>(delay, interval, count, callback, t1, t2, t3);
            t.Start();

            return t;
        }

        public static Timer DelayCall<T1, T2, T3, T4>(
            TimerStateCallback<T1, T2, T3, T4> callback, T1 t1, T2 t2, T3 t3, T4 t4
        ) =>
            DelayCall(TimeSpan.Zero, TimeSpan.Zero, 1, callback, t1, t2, t3, t4);

        public static Timer DelayCall<T1, T2, T3, T4>(
            TimeSpan delay, TimerStateCallback<T1, T2, T3, T4> callback,
            T1 t1, T2 t2, T3 t3, T4 t4
        ) => DelayCall(delay, TimeSpan.Zero, 1, callback, t1, t2, t3, t4);

        public static Timer DelayCall<T1, T2, T3, T4>(
            TimeSpan delay, TimeSpan interval,
            TimerStateCallback<T1, T2, T3, T4> callback, T1 t1, T2 t2, T3 t3, T4 t4
        ) =>
            DelayCall(delay, interval, 0, callback, t1, t2, t3, t4);

        public static Timer DelayCall<T1, T2, T3, T4>(
            TimeSpan delay, TimeSpan interval, int count,
            TimerStateCallback<T1, T2, T3, T4> callback, T1 t1, T2 t2, T3 t3, T4 t4
        )
        {
            Timer t = new DelayStateCallTimer<T1, T2, T3, T4>(delay, interval, count, callback, t1, t2, t3, t4);
            t.Start();

            return t;
        }

        private class DelayCallTimer : Timer
        {
            public DelayCallTimer(TimeSpan delay, TimeSpan interval, int count, TimerCallback callback) : base(
                delay,
                interval,
                count
            )
            {
                Callback = callback;
            }

            public TimerCallback Callback { get; }

            protected override void OnTick()
            {
                Callback?.Invoke();
            }

            public override string ToString() => $"DelayCallTimer[{FormatDelegate(Callback)}]";
        }

        private class DelayStateCallTimer<T> : Timer
        {
            private readonly T m_State;

            public DelayStateCallTimer(TimeSpan delay, TimeSpan interval, int count, TimerStateCallback<T> callback, T state)
                : base(delay, interval, count)
            {
                Callback = callback;
                m_State = state;
            }

            public TimerStateCallback<T> Callback { get; }

            protected override void OnTick()
            {
                Callback?.Invoke(m_State);
            }

            public override string ToString() => $"DelayStateCall[{FormatDelegate(Callback)}]";
        }

        private class DelayStateCallTimer<T1, T2> : Timer
        {
            private readonly T1 m_T1;
            private readonly T2 m_T2;

            public DelayStateCallTimer(
                TimeSpan delay, TimeSpan interval, int count, TimerStateCallback<T1, T2> callback,
                T1 t1, T2 t2
            ) : base(delay, interval, count)
            {
                Callback = callback;
                m_T1 = t1;
                m_T2 = t2;
            }

            public TimerStateCallback<T1, T2> Callback { get; }

            protected override void OnTick()
            {
                Callback?.Invoke(m_T1, m_T2);
            }

            public override string ToString() => $"DelayStateCall[{FormatDelegate(Callback)}]";
        }

        private class DelayStateCallTimer<T1, T2, T3> : Timer
        {
            private readonly T1 m_T1;
            private readonly T2 m_T2;
            private readonly T3 m_T3;

            public DelayStateCallTimer(
                TimeSpan delay, TimeSpan interval, int count, TimerStateCallback<T1, T2, T3> callback,
                T1 t1, T2 t2, T3 t3
            ) : base(delay, interval, count)
            {
                Callback = callback;
                m_T1 = t1;
                m_T2 = t2;
                m_T3 = t3;
            }

            public TimerStateCallback<T1, T2, T3> Callback { get; }

            protected override void OnTick()
            {
                Callback?.Invoke(m_T1, m_T2, m_T3);
            }

            public override string ToString() => $"DelayStateCall[{FormatDelegate(Callback)}]";
        }

        private class DelayStateCallTimer<T1, T2, T3, T4> : Timer
        {
            private readonly T1 m_T1;
            private readonly T2 m_T2;
            private readonly T3 m_T3;
            private readonly T4 m_T4;

            public DelayStateCallTimer(
                TimeSpan delay, TimeSpan interval, int count, TimerStateCallback<T1, T2, T3, T4> callback,
                T1 t1, T2 t2, T3 t3, T4 t4
            ) : base(delay, interval, count)
            {
                Callback = callback;
                m_T1 = t1;
                m_T2 = t2;
                m_T3 = t3;
                m_T4 = t4;
            }

            public TimerStateCallback<T1, T2, T3, T4> Callback { get; }

            protected override void OnTick()
            {
                Callback?.Invoke(m_T1, m_T2, m_T3, m_T4);
            }

            public override string ToString() => $"DelayStateCall[{FormatDelegate(Callback)}]";
        }
    }
}