/*
 * Copyright(c) 2019 Samsung Electronics Co., Ltd.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 *
 */

using global::System;
using System.Runtime.InteropServices;

namespace Tizen.NUI
{
    internal class VisualEventSignal : IDisposable
    {
        public VisualEventSignal() : this(Interop.VisualEventSignal.New(), true)
        {
            if (NDalicPINVOKE.SWIGPendingException.Pending) throw NDalicPINVOKE.SWIGPendingException.Retrieve();
        }

        ~VisualEventSignal()
        {
            if (!isDisposeQueued)
            {
                isDisposeQueued = true;
                DisposeQueue.Instance.Add(this);
            }
        }

        public void Dispose()
        {
            if (!Window.IsInstalled())
            {
                throw new System.InvalidOperationException("This API called from separate thread. This API must be called from MainThread.");
            }

            if (isDisposeQueued)
            {
                Dispose(DisposeTypes.Implicit);
            }
            else
            {
                Dispose(DisposeTypes.Explicit);
                GC.SuppressFinalize(this);
            }
        }

        protected virtual void Dispose(DisposeTypes type)
        {
            if (disposed)
            {
                return;
            }

            if (type == DisposeTypes.Explicit)
            {
                //Called by User
                //Release your own managed resources here.
                //You should release all of your own disposable objects here.

            }

            //Release your own unmanaged resources here.
            //You should not access any managed member here except static instance.
            //because the execution order of Finalizes is non-deterministic.

            if (swigCPtr.Handle != IntPtr.Zero)
            {
                if (swigCMemOwn)
                {
                    swigCMemOwn = false;
                    Interop.VisualEventSignal.Delete(swigCPtr);
                }
                swigCPtr = new HandleRef(null, IntPtr.Zero);
            }
            disposed = true;
        }

        public bool Empty()
        {
            bool ret = Interop.VisualEventSignal.Empty(swigCPtr);
            if (NDalicPINVOKE.SWIGPendingException.Pending) throw NDalicPINVOKE.SWIGPendingException.Retrieve();
            return ret;
        }

        public uint GetConnectionCount()
        {
            uint ret = Interop.VisualEventSignal.GetConnectionCount(swigCPtr);
            if (NDalicPINVOKE.SWIGPendingException.Pending) throw NDalicPINVOKE.SWIGPendingException.Retrieve();
            return ret;
        }

        public void Connect(Delegate func)
        {
            NUILog.Debug("VisualEventSignal.Connect()!");

            IntPtr ip = Marshal.GetFunctionPointerForDelegate<Delegate>(func);
            {
                Interop.VisualEventSignal.Connect(swigCPtr, new HandleRef(this, ip));
                if (NDalicPINVOKE.SWIGPendingException.Pending) throw NDalicPINVOKE.SWIGPendingException.Retrieve();
            }
        }

        public void Disconnect(Delegate func)
        {
            NUILog.Debug("VisualEventSignal.Disconnect()!");

            IntPtr ip = Marshal.GetFunctionPointerForDelegate<Delegate>(func);
            {
                Interop.VisualEventSignal.Disconnect(swigCPtr, new HandleRef(this, ip));
                if (NDalicPINVOKE.SWIGPendingException.Pending) throw NDalicPINVOKE.SWIGPendingException.Retrieve();
            }
        }

        public void Emit(BaseComponents.View target, int visualIndex, int signalId)
        {
            Interop.VisualEventSignal.Emit(swigCPtr, BaseComponents.View.getCPtr(target), visualIndex, signalId);
            if (NDalicPINVOKE.SWIGPendingException.Pending) throw NDalicPINVOKE.SWIGPendingException.Retrieve();
        }

        internal VisualEventSignal(IntPtr cPtr, bool cMemoryOwn)
        {
            swigCMemOwn = cMemoryOwn;
            swigCPtr = new HandleRef(this, cPtr);
        }

        internal static HandleRef getCPtr(VisualEventSignal obj)
        {
            return (obj == null) ? new HandleRef(null, IntPtr.Zero) : obj.swigCPtr;
        }

        private HandleRef swigCPtr;
        protected bool swigCMemOwn;

        private bool isDisposeQueued = false;
        protected bool disposed = false;

    }
}