using PaintDotNet.SystemLayer;
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Drawing;
using System.Windows.Forms;

namespace PaintDotNet.CustomControl
{
    public enum DocumentBottomClickAction
    {
        Select,
        Close
    }

    public partial class DocumentBottomStrip : IBottomNameStrip
    {
        private List<string> documents = new List<string>();
        private List<Color> documentColors = new List<Color>();
        private List<IBottomNameStrip.Item> documentButtons = new List<IBottomNameStrip.Item>();
        private Dictionary<string, IBottomNameStrip.Item> dw2button = new Dictionary<string, IBottomNameStrip.Item>();
        private Dictionary<string, RenderArgs> thumbs = new Dictionary<string, RenderArgs>();

        public void ClearTextBox()
        {
            this.documents.Clear();
            this.documentColors.Clear();
            this.items.Clear();
            this.documentButtons.Clear();
            this.dw2button.Clear();
            
            QueueThumbnailUpdate(this.documents.Count + "");
            OnDocumentListChanged();
        }

        public int DocumentCount
        {
            get
            {
                return this.documents.Count;
            }
        }

        public event EventHandler DocumentListChanged;
        protected virtual void OnDocumentListChanged()
        {
            if (DocumentListChanged != null)
            {
                DocumentListChanged(this, EventArgs.Empty);
            }
        }

        public override Size GetPreferredSize(Size proposedSize)
        {
            Size itemSize = ItemSize;
            int preferredWidth;

            if (this.ItemCount == 0)
            {
                preferredWidth = 0;
            }
            else
            {
                preferredWidth = itemSize.Width * DocumentCount;
            }

            Size preferredSize = new Size(preferredWidth, itemSize.Height);
            return preferredSize;
        }

        public DocumentBottomStrip()
        {
            InitializeComponent();
            this.ShowCloseButtons = false;
            this.ShowCheckedColor = false;
        }
        private void InitializeComponent()
        {
            this.Name = "DocumentBottomStrip";
        }

        protected override void Dispose(bool disposing)
        {
            base.Dispose(disposing);
        }

        protected override void OnScrollArrowClicked(ArrowDirection arrowDirection)
        {
            int sign = 0;

            switch (arrowDirection)
            {
                case ArrowDirection.Left:
                    sign = -1;
                    break;

                case ArrowDirection.Right:
                    sign = +1;
                    break;
            }

            int delta = ItemSize.Width;

            ScrollOffset += sign * delta;

            base.OnScrollArrowClicked(arrowDirection);
        }

        protected override void OnItemClicked(Item item, ItemPart itemPart, MouseButtons mouseButtons)
        {
            string dw = item.Tag as string;

            if (dw != null)
            {
                switch (itemPart)
                {
                    case ItemPart.None:
                        // do nothing
                        break;

                    case ItemPart.CloseButton:
                        if (mouseButtons == MouseButtons.Left)
                        {
                            OnDocumentClicked(dw, DocumentBottomClickAction.Close);
                        }
                        break;

                    case ItemPart.Image:
                        if (mouseButtons == MouseButtons.Left)
                        {
                            SelectTextBox(dw);
                            //SelectedDocument = dw;
                        }
                        else if (mouseButtons == MouseButtons.Right)
                        {
                            // TODO ZYH 预留右键菜单
                        }
                        break;

                    default:
                        throw new InvalidEnumArgumentException();
                }
            }

            base.OnItemClicked(item, itemPart, mouseButtons);
        }

        public event EventHandler<EventArgs<Pair<string, DocumentBottomClickAction>>> DocumentClicked;
        protected virtual void OnDocumentClicked(string dw, DocumentBottomClickAction action)
        {
            if (DocumentClicked != null)
            {
                DocumentClicked(this, new EventArgs<Pair<string, DocumentBottomClickAction>>(
                    Pair.Create(dw, action)));
            }
        }

        public void AddTextBox(string addMe, Color color, bool check)
        {
            this.documents.Add(addMe);
            this.documentColors.Add(color);

            IBottomNameStrip.Item docButton = new IBottomNameStrip.Item();
            docButton.Image = null;
            docButton.Tag = this.documents.Count + "";
            docButton.Checked = check;
            docButton.NColor = color;

            AddItem(docButton);
            this.documentButtons.Add(docButton);

            if (!this.dw2button.ContainsKey(this.documents.Count + ""))
            {
                this.dw2button.Add(this.documents.Count + "", docButton);
            }

            QueueThumbnailUpdate(this.documents.Count + "");

            OnDocumentListChanged();
        }

        public void RemoveTextBox(string removeMe)
        {
            OnDocumentListChanged();
        }

        protected override void OnLayout(LayoutEventArgs levent)
        {
            base.OnLayout(levent);
        }

        public void SelectTextBox(string selectMe)
        {
            UI.SuspendControlPainting(this);

            foreach (IBottomNameStrip.Item docItem in this.documentButtons)
            {
                if ((docItem.Tag as string) == selectMe)
                {
                    EnsureItemFullyVisible(docItem);
                    docItem.Checked = !docItem.Checked;
                    if (this.AllowMultiChoise)
                    {
                        break;
                    }
                }
                else if (!this.AllowMultiChoise)
                {
                    docItem.Checked = false;
                }
            }

            UI.ResumeControlPainting(this);
            Invalidate(true);
        }

        private void OnThumbnailUpdated(string dw)
        {
            if (this.dw2button.ContainsKey(dw))
            {
                IBottomNameStrip.Item docButton = this.dw2button[dw];
                //RenderArgs docRA = this.thumbs[dw];
                docButton.Name = this.documents[int.Parse(dw) - 1]/*dw*/;//.GetFriendlyName();
                docButton.NColor = this.documentColors[int.Parse(dw) - 1];
                //docButton.Image = docRA.Bitmap;
                docButton.Update();
            }
        }

        public void QueueThumbnailUpdate(string dw)
        {
            OnThumbnailUpdated(dw);
        }
    }
}