/*
 * 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 System;
using System.Runtime.InteropServices;
using Tizen.NUI.BaseComponents;
using System.ComponentModel;

namespace Tizen.NUI
{
    /// <summary>
    /// This class emits a signals when a long press gesture occurs that meets the requirements set by the application.<br />
    /// For any valid long press, two signals will be emitted:<br />
    /// - First identifying the beginning (state = Started) i.e. when fingers held down for the required time.<br />
    /// - Second identifying the ending (state = Finished) i.e. when fingers are released.<br />
    /// </summary>
    /// This will be public opened in tizen_5.0 after ACR done. Before ACR, need to be hidden as inhouse API.
    [EditorBrowsable(EditorBrowsableState.Never)]
    public class LongPressGestureDetector : GestureDetector
    {
        /// <summary>
        /// Constructor.
        /// </summary>
        /// This will be public opened in tizen_5.0 after ACR done. Before ACR, need to be hidden as inhouse API.
        [EditorBrowsable(EditorBrowsableState.Never)]
        public LongPressGestureDetector() : this(Interop.LongPressGestureDetector.New(), true)
        {
            if (NDalicPINVOKE.SWIGPendingException.Pending) throw NDalicPINVOKE.SWIGPendingException.Retrieve();
        }

        /// <summary>
        /// Creates an initialized LongPressGestureDetector with the number of touches required.<br />
        /// A long press gesture will be emitted from this detector if the number of fingers touching the screen is equal to the touches required.<br />
        /// </summary>
        /// <param name="touchesRequired">The number of touches required.</param>
        /// This will be public opened in tizen_5.0 after ACR done. Before ACR, need to be hidden as inhouse API.
        [EditorBrowsable(EditorBrowsableState.Never)]
        public LongPressGestureDetector(uint touchesRequired) : this(Interop.LongPressGestureDetector.New(touchesRequired), true)
        {
            if (NDalicPINVOKE.SWIGPendingException.Pending) throw NDalicPINVOKE.SWIGPendingException.Retrieve();
        }

        /// <summary>
        /// Creates an initialized LongPressGestureDetector with the minimum and maximum number of touches required.<br />
        /// A long press gesture will be emitted from this detector if the number of fingers touching the screen falls between the minimum and maximum touches set.<br />
        /// </summary>
        /// <param name="minTouches">The minimum number of touches required.</param>
        /// <param name="maxTouches">The maximum number of touches required.</param>
        /// This will be public opened in tizen_5.0 after ACR done. Before ACR, need to be hidden as inhouse API.
        [EditorBrowsable(EditorBrowsableState.Never)]
        public LongPressGestureDetector(uint minTouches, uint maxTouches) : this(Interop.LongPressGestureDetector.New(minTouches, maxTouches), true)
        {
            if (NDalicPINVOKE.SWIGPendingException.Pending) throw NDalicPINVOKE.SWIGPendingException.Retrieve();
        }

        /// <summary>
        /// The copy constructor.
        /// </summary>
        /// <param name="handle">A reference to the copied handle</param>
        /// This will be public opened in tizen_5.0 after ACR done. Before ACR, need to be hidden as inhouse API.
        [EditorBrowsable(EditorBrowsableState.Never)]
        public LongPressGestureDetector(LongPressGestureDetector handle) : this(Interop.LongPressGestureDetector.NewLongPressGestureDetector(LongPressGestureDetector.getCPtr(handle)), true)
        {
            if (NDalicPINVOKE.SWIGPendingException.Pending) throw NDalicPINVOKE.SWIGPendingException.Retrieve();
        }

        internal LongPressGestureDetector(global::System.IntPtr cPtr, bool cMemoryOwn) : base(cPtr, cMemoryOwn)
        {
        }

        private DaliEventHandler<object, DetectedEventArgs> detectedEventHandler;
        [UnmanagedFunctionPointer(CallingConvention.StdCall)]
        private delegate void DetectedCallbackType(IntPtr actor, IntPtr longPressGesture);
        private DetectedCallbackType detectedCallback;

        /// <summary>
        /// This signal is emitted when the specified long press is detected on the attached view.
        /// </summary>
        /// This will be public opened in tizen_5.0 after ACR done. Before ACR, need to be hidden as inhouse API.
        [EditorBrowsable(EditorBrowsableState.Never)]
        public event DaliEventHandler<object, DetectedEventArgs> Detected
        {
            add
            {
                if (detectedEventHandler == null)
                {
                    detectedCallback = OnLongPressGestureDetected;
                    DetectedSignal().Connect(detectedCallback);
                }

                detectedEventHandler += value;
            }

            remove
            {
                detectedEventHandler -= value;

                if (detectedEventHandler == null && DetectedSignal().Empty() == false)
                {
                    DetectedSignal().Disconnect(detectedCallback);
                }
            }
        }

        /// <summary>
        /// Sets the number of touches required.<br />
        /// The number of touches corresponds to the number of fingers a user has on the screen. The default is 1.<br />
        /// </summary>
        /// <param name="touches">Touches required</param>
        /// This will be public opened in tizen_5.0 after ACR done. Before ACR, need to be hidden as inhouse API.
        [EditorBrowsable(EditorBrowsableState.Never)]
        public void SetTouchesRequired(uint touches)
        {
            Interop.LongPressGestureDetector.SetTouchesRequired(SwigCPtr, touches);
            if (NDalicPINVOKE.SWIGPendingException.Pending) throw NDalicPINVOKE.SWIGPendingException.Retrieve();
        }

        /// <summary>
        /// Sets the minimum and maximum touches required.
        /// </summary>
        /// <param name="minTouches">Minimum touches required.</param>
        /// <param name="maxTouches">Maximum touches required.</param>
        /// This will be public opened in tizen_5.0 after ACR done. Before ACR, need to be hidden as inhouse API.
        [EditorBrowsable(EditorBrowsableState.Never)]
        public void SetTouchesRequired(uint minTouches, uint maxTouches)
        {
            Interop.LongPressGestureDetector.SetTouchesRequired(SwigCPtr, minTouches, maxTouches);
            if (NDalicPINVOKE.SWIGPendingException.Pending) throw NDalicPINVOKE.SWIGPendingException.Retrieve();
        }

        /// <summary>
        /// Retrieves the minimum number of touches required.
        /// </summary>
        /// <returns>The minimum number of touches required.</returns>
        /// This will be public opened in tizen_5.0 after ACR done. Before ACR, need to be hidden as inhouse API.
        [EditorBrowsable(EditorBrowsableState.Never)]
        public uint GetMinimumTouchesRequired()
        {
            uint ret = Interop.LongPressGestureDetector.GetMinimumTouchesRequired(SwigCPtr);
            if (NDalicPINVOKE.SWIGPendingException.Pending) throw NDalicPINVOKE.SWIGPendingException.Retrieve();
            return ret;
        }

        /// <summary>
        /// Retrieves the maximum number of touches required.
        /// </summary>
        /// <returns>The maximum number of touches required.</returns>
        /// This will be public opened in tizen_5.0 after ACR done. Before ACR, need to be hidden as inhouse API.
        [EditorBrowsable(EditorBrowsableState.Never)]
        public uint GetMaximumTouchesRequired()
        {
            uint ret = Interop.LongPressGestureDetector.GetMaximumTouchesRequired(SwigCPtr);
            if (NDalicPINVOKE.SWIGPendingException.Pending) throw NDalicPINVOKE.SWIGPendingException.Retrieve();
            return ret;
        }

        internal static LongPressGestureDetector GetLongPressGestureDetectorFromPtr(global::System.IntPtr cPtr)
        {
            LongPressGestureDetector ret = new LongPressGestureDetector(cPtr, false);
            if (NDalicPINVOKE.SWIGPendingException.Pending) throw NDalicPINVOKE.SWIGPendingException.Retrieve();
            return ret;
        }

        internal new static LongPressGestureDetector DownCast(BaseHandle handle)
        {
            LongPressGestureDetector ret = Registry.GetManagedBaseHandleFromNativePtr(handle) as LongPressGestureDetector;
            if (NDalicPINVOKE.SWIGPendingException.Pending) throw NDalicPINVOKE.SWIGPendingException.Retrieve();
            return ret;
        }

        internal LongPressGestureDetector Assign(LongPressGestureDetector rhs)
        {
            LongPressGestureDetector ret = new LongPressGestureDetector(Interop.LongPressGestureDetector.Assign(SwigCPtr, LongPressGestureDetector.getCPtr(rhs)), false);
            if (NDalicPINVOKE.SWIGPendingException.Pending) throw NDalicPINVOKE.SWIGPendingException.Retrieve();
            return ret;
        }

        internal LongPressGestureDetectedSignal DetectedSignal()
        {
            LongPressGestureDetectedSignal ret = new LongPressGestureDetectedSignal(Interop.LongPressGestureDetector.DetectedSignal(SwigCPtr), false);
            if (NDalicPINVOKE.SWIGPendingException.Pending) throw NDalicPINVOKE.SWIGPendingException.Retrieve();
            return ret;
        }

        /// This will not be public opened.
        [EditorBrowsable(EditorBrowsableState.Never)]
        protected override void ReleaseSwigCPtr(System.Runtime.InteropServices.HandleRef swigCPtr)
        {
            if (detectedEventHandler == null && DetectedSignal().Empty() == false)
            {
                DetectedSignal().Disconnect(detectedCallback);
            }
            Interop.LongPressGestureDetector.DeleteLongPressGestureDetector(swigCPtr);
        }

        private void OnLongPressGestureDetected(IntPtr actor, IntPtr longPressGesture)
        {
            DetectedEventArgs e = new DetectedEventArgs();

            // Populate all members of "e" (LongPressGestureEventArgs) with real data.
            e.View = Registry.GetManagedBaseHandleFromNativePtr(actor) as View;
            if (null == e.View)
            {
                e.View = Registry.GetManagedBaseHandleFromRefObject(actor) as View;
            }

            e.LongPressGesture = Tizen.NUI.LongPressGesture.GetLongPressGestureFromPtr(longPressGesture);

            if (detectedEventHandler != null)
            {
                //Here we send all data to user event handlers.
                detectedEventHandler(this, e);
            }
        }

        /// <summary>
        /// Event arguments that passed via the LongPressGestureEvent signal.
        /// </summary>
        /// <since_tizen> 5 </since_tizen>
        /// This will be public opened in tizen_5.0 after ACR done. Before ACR, need to be hidden as inhouse API.
        [EditorBrowsable(EditorBrowsableState.Never)]
        public class DetectedEventArgs : EventArgs
        {
            private View view;
            private LongPressGesture longPressGesture;
            private bool handled = true;

            /// <summary>
            /// View the attached view.
            /// </summary>
            /// <since_tizen> 5 </since_tizen>
            /// This will be public opened in tizen_5.0 after ACR done. Before ACR, need to be hidden as inhouse API.
            [EditorBrowsable(EditorBrowsableState.Never)]
            public View View
            {
                get
                {
                    return view;
                }
                set
                {
                    view = value;
                }
            }

            /// <summary>
            /// The LongPressGesture.
            /// </summary>
            /// <since_tizen> 5 </since_tizen>
            /// This will be public opened in tizen_5.0 after ACR done. Before ACR, need to be hidden as inhouse API.
            [EditorBrowsable(EditorBrowsableState.Never)]
            public LongPressGesture LongPressGesture
            {
                get
                {
                    return longPressGesture;
                }
                set
                {
                    longPressGesture = value;
                }
            }

            /// <summary>
            /// Gets or sets a value that indicates whether the event handler has completely handled the event or whether the system should continue its own processing.
            /// </summary>
            [EditorBrowsable(EditorBrowsableState.Never)]
            public bool Handled
            {
                get => handled;
                set
                {
                    handled = value;
                    Interop.Actor.SetNeedGesturePropagation(View.getCPtr(view), !value);
                    if (NDalicPINVOKE.SWIGPendingException.Pending)
                        throw NDalicPINVOKE.SWIGPendingException.Retrieve();
                }
            }
        }
    }
}