using System;
using System.Drawing;
using Foundation;
using UIKit;
using WebKit;
namespace HDL_ON_iOS
{
    public class ViewControllerBase : Shared.BaseViewController
    {
        //public override bool ShouldAutorotateToInterfaceOrientation (UIInterfaceOrientation toInterfaceOrientation)
        //{
        //    return false;
        //}

        NSObject _keyboardObserverWillShow;
        NSObject _keyboardObserverWillHide;


        //public override bool ShouldAutorotate ()
        //{
        //    return false;
        //}

        //public override UIInterfaceOrientationMask GetSupportedInterfaceOrientations ()
        //{
        //    if (UIDevice.CurrentDevice.UserInterfaceIdiom == UIUserInterfaceIdiom.Pad) {
        //        UIApplication.SharedApplication.SetStatusBarOrientation (UIInterfaceOrientation.LandscapeRight, false);
        //        return UIInterfaceOrientationMask.LandscapeRight;
        //    } else {
        //        return UIInterfaceOrientationMask.Portrait;
        //    }
        //}

        public override void ViewDidLoad()
        {
            base.ViewDidLoad();
            //设置键盘事件处理程序
            RegisterForKeyboardNotifications();
        }
        protected virtual void RegisterForKeyboardNotifications()
        {
            _keyboardObserverWillShow = NSNotificationCenter.DefaultCenter.AddObserver
                (UIKeyboard.WillShowNotification, KeyboardWillShowNotification);
            _keyboardObserverWillHide = NSNotificationCenter.DefaultCenter.AddObserver
                (UIKeyboard.WillHideNotification, KeyboardWillHideNotification);
        }
        protected virtual void UnregisterKeyboardNotifications()
        {
            NSNotificationCenter.DefaultCenter.RemoveObserver(_keyboardObserverWillShow);
            NSNotificationCenter.DefaultCenter.RemoveObserver(_keyboardObserverWillHide);
        }
        protected virtual UIView KeyboardGetActiveView()
        {
            return this.View.FindFirstResponder();
        }
        protected virtual void KeyboardWillShowNotification(NSNotification notification)
        {
            UIView activeView = KeyboardGetActiveView();
            if (activeView == null)
                return;
            string sss = activeView.ToString();
            if (sss.StartsWith("<WKContentView"))
                return;
            UIView scrollView = activeView.FindSuperviewOfType_Self(this.View, typeof(UIView)) as UIView;
            if (scrollView == null)
                return;
            CoreGraphics.CGRect keyboardBounds = UIKeyboard.BoundsFromNotification(notification);
            //UIEdgeInsets contentInsets = new UIEdgeInsets (0.0f, 0.0f, keyboardBounds.Size.Height, 0.0f);
            //scrollView.ContentInset = contentInsets;
            //scrollView.ScrollIndicatorInsets = contentInsets;
            CoreGraphics.CGRect viewRectAboveKeyboard = new CoreGraphics.CGRect(this.View.Frame.Location,
                new CoreGraphics.CGSize(this.View.Frame.Width, this.View.Frame.Size.Height - keyboardBounds.Size.Height));
            CoreGraphics.CGRect activeFieldAbsoluteFrame = activeView.Superview.ConvertRectToView(activeView.Frame, this.View);
            if (!viewRectAboveKeyboard.Contains(activeFieldAbsoluteFrame))
            {
                //PointF scrollPoint = new PointF (0.0f,
                //    (float)(activeFieldAbsoluteFrame.Location.Y + activeFieldAbsoluteFrame.Height
                //        + scrollView.ContentOffset.Y - viewRectAboveKeyboard.Height));
                //    scrollView.SetContentOffset (scrollPoint, true);

                scrollView.Bounds = new CoreGraphics.CGRect(0.0f,
                                                             (float)(activeFieldAbsoluteFrame.Location.Y + activeFieldAbsoluteFrame.Height
                                                                     + scrollView.Frame.Y - viewRectAboveKeyboard.Height)
                                                             , this.View.Frame.Width, this.View.Frame.Height);
            }
            //if (this.View.Frame.Height - activeView.Frame.Bottom < keyboardBounds.Size.Height)
            //    scrollView.Bounds = new CoreGraphics.CGRect (0.0f, this.View.Frame.Height - activeView.Frame.Height - keyboardBounds.Size.Height, this.View.Frame.Width, this.View.Frame.Height);
        }
        protected virtual void KeyboardWillHideNotification(NSNotification notification)
        {
            UIView activeView = KeyboardGetActiveView();
            if (activeView == null)
                return;
            string sss = activeView.ToString();
            if (sss.StartsWith("<WKContentView"))
                return;
            UIView scrollView = activeView.FindSuperviewOfType_Self(this.View, typeof(UIView)) as UIView;
            if (scrollView == null)
                return;
            double animationDuration = UIKeyboard.AnimationDurationFromNotification(notification);
            //UIEdgeInsets contentInsets = new UIEdgeInsets (0.0f, 0.0f, 0.0f, 0.0f);
            //UIView.Animate (animationDuration, delegate {
            //    scrollView.ContentInset = contentInsets;
            //    scrollView.ScrollIndicatorInsets = contentInsets;
            //});
            scrollView.Bounds = new CoreGraphics.CGRect(0.0f, 0.0f, this.View.Frame.Width, this.View.Frame.Height);

        }
    }

    public static class ViewExtensions
    {
        public static UIView FindFirstResponder(this UIView view)
        {
            if (view.IsFirstResponder)
            {
                return view;
            }
            foreach (UIView subView in view.Subviews)
            {
                var firstResponder = subView.FindFirstResponder();
                if (firstResponder != null)
                    return firstResponder;
            }
            return null;
        }
        public static UIView FindSuperviewOfType(this UIView view, UIView stopAt, Type type)
        {
            if (view.Superview != null)
            {
                if (type.IsAssignableFrom(view.Superview.GetType()))
                {
                    return view.Superview;
                }
                if (view.Superview != stopAt)
                    return view.Superview.FindSuperviewOfType(stopAt, type);
            }
            return null;
        }

        public static UIView FindSuperviewOfType_Self(this UIView view, UIView stopAt, Type type)
        {
            if (view.Superview != null)
            {
                return view.Superview.FindSuperviewOfType_Self(stopAt, type);
            }
            return view;
        }
    }
}