using System;
using System.Collections.Generic;
using System.Drawing;
using System.Linq;
using System.Windows.Forms;
using JD.Application.View.Timeline;
using JD.Audio.Annotations;
using JD.Collections.Extensions;
using JD.Maths.Utils;
using JD.VideoPlayer.Project;
using TeaBox;
using JD.Serialization;

namespace JD.Timeline.View.ClipView.Widgets
{
    public class DanceEditorClipWidget : ClipWidget
    {
        #region Variables

        private List<ToolbarItem> _toolbarItems = new List<ToolbarItem>();
        protected static readonly Color SelectionBorderColor = Color.FromArgb(255, 200, 0);
        protected static readonly Color SelectionFillColor = Color.FromArgb(100, SelectionBorderColor);
        protected static readonly Pen SelectionBorderPen = new Pen(SelectionBorderColor, 2);
        protected static readonly Pen PlayingBorderPen = new Pen(Color.Firebrick, 2);
        protected static readonly Color WarningFillColor = Color.FromArgb(255, 255, 0);

        #endregion

        #region Constructor

        public DanceEditorClipWidget(Clip model) 
            : base(model)
        {

        }

        #endregion

        #region Properties

        public List<ToolbarItem> ToolbarItems
        {
            get { return _toolbarItems; }
            set { _toolbarItems = value; }
        }

        /// <summary>
        /// Whether the timeline cursors is currently over the clip.
        /// </summary>
        protected bool IsPlaying
        {
            get
            {
                var currentBeat = Timeline.BeatFromTimeUnit(Timeline.TimeCursor.Time).Value;
                return currentBeat.IsBetween(Model.StartBeat, Model.StopBeat);
            }
        }

        #endregion

        #region Methods

        /// <summary>
        /// Default painting for Dance Editor clips
        /// </summary>
        protected override void OnPaint(PaintEventArgs e)
        {
            SetupBounds();

            var graphics = e.Graphics;

            if (Model.CollisionsWithOther)
            {
                DrawClipWithWarning(graphics);
                return;
            }

            FillBackground(graphics, Bounds, BackgroundColor);
            DrawClipType(Model.Type, graphics);

            if (Selected)
            {
                FillBackground(graphics, Bounds, SelectionFillColor);
                DrawRectangle(graphics, Bounds, SelectionBorderPen);
            }
            else
            {
                DrawEdge(graphics, Bounds);
            }

            OnPaintChildControls(e);
        }

        /// <summary>
        /// Method used to draw clip when there is a warning
        /// </summary>
        protected void DrawClipWithWarning(Graphics graphics, int additionalOffsetX = 0, int additionalOffsetY = 0)
        {
            var image = Properties.Resources.Icon_16x16_warning;
            var imageBounds = new Rectangle(Bounds.X + 2 + additionalOffsetX, Bounds.Top + 2 + additionalOffsetY, image.Width, image.Height); ;

            int right = Bounds.Right;
            if (imageBounds.Right > right)
            {
                imageBounds.Width -= imageBounds.Right - right;
            }
            if (image != null)
            {
                graphics.DrawImageUnscaledAndClipped(image, imageBounds);
            }

            DrawNotificationIcons(graphics);
        }

        /// <summary>
        /// Drawing of notification icons
        /// </summary>
        protected void DrawNotificationIcons(Graphics graphics)
        {
            foreach (var icon in ToolbarItems.Where(x => x.IsVisible()))
            {
                var bounds = GetBounds(icon);
                if (bounds.Width > 0)
                {
                    graphics.DrawImage(icon.Bitmap(), bounds);
                }
            }
        }

        /// <summary>
        /// Returns the bounds of the notification icon. Used for drawing and mouse interaction.
        /// </summary>
        protected Rectangle GetBounds(ToolbarItem icon)
        {
            var icons = ToolbarItems.Where(x => x.IsVisible()).ToList();
            while (icons.Count > 0 && icons.Sum(x => x.Width) > Bounds.Width)
            {
                var iconToRemove = icons.MaxElement(x => x.Priority);
                if (iconToRemove != null)
                {
                    icons.Remove(iconToRemove);
                }
            }

            if (!icons.Contains(icon))
                return new Rectangle(0,0,0,0);
          
            int left = Bounds.Right;
            foreach (var notificationIcon in icons)
            {
                left -= notificationIcon.Width;
                if (notificationIcon == icon)
                    break;
            }
            return new Rectangle(left, Bounds.Top, icon.Width, icon.Height);
        }
        
        /// <summary>
        /// Handles click on notification icons
        /// </summary>
        public override void OnMouseClick(MouseEventArgs e)
        {
            if (e.Button == MouseButtons.Left)
            {
                foreach (var notificationIcon in ToolbarItems)
                {
                    if (GetBounds(notificationIcon).Contains(e.Location))
                    {
                        ToolbarItem icon = notificationIcon;
                        if (icon.OnClick != null)
                        {
                            TeaBox.ObjectModel.Application.Main.Dispatcher.DispatchAsync(() => icon.OnClick(),forceAsync: true);
                        }
                    }
                }
            }
            base.OnMouseClick(e);
        }

        #endregion

        #region Video Preview

        private float _lastPaintBeat;

        protected void PaintPictogram(Graphics graphics)
        {
            var destBounds = Bounds;
            destBounds.Height -= 10;
            destBounds.Y += 5;

            var currentBeat = Timeline.BeatFromTimeUnit(Timeline.TimeCursor.Time).Value;
            var isPlaying = IsPlaying;
            var wasPlaying = _lastPaintBeat.IsBetween(Model.StartBeat, Model.StopBeat);

            // While playing, refresh the cursor when moving over the clip.
            if (Math.Abs(_lastPaintBeat - currentBeat) > 0.001 && (isPlaying || wasPlaying))
            {
                Invalidate();
            }

            _lastPaintBeat = currentBeat;

            var beatToPaint = GetBeatToPaint(currentBeat);

            Model.Tape.VideoSpriteSheet().Paint(graphics, new BeatUnit(beatToPaint), destBounds);
        }

        protected virtual float GetBeatToPaint(float currentBeat)
        {
            if (currentBeat.IsBetween(Model.StartBeat, Model.StopBeat) && !IsDragging)
            {
                return currentBeat;
            }

            return Model.StartBeat;
        }

        #endregion
    }

    #region NotificationIcon

    /// <summary>
    /// Represents a notification icon on widget's top-right corner
    /// </summary>
    public class ToolbarItem
    {
        private Func<Bitmap> _bitmap;

        public Func<Bitmap> Bitmap
        {
            get { return _bitmap; }
            set 
            { 
                _bitmap = value;
                Width = value().Width;
                Height = value().Height;
            }
        }

        public int Width { get; private set; }
        public int Height { get; private set; }

        public Func<bool> IsVisible = () => true;
        public System.Action OnClick = () => { };

        public uint Priority { get; set; }
    }

    #endregion
}