using System;
using System.Drawing;
using System.Windows.Forms;
using System.Collections.Generic;
using System.ComponentModel;
using NaGet.Packages;
using NaGet.Packages.Install;

namespace AppliStation
{
	/// <summary>
	/// PackageListViewの表示フィルタ
	/// </summary>
	[Flags]
	public enum PackageListViewPkgTypeFilter
	{
		None = 0,
		NotInstalled = 1,
		InstalledAS = 2,
		InstalledSys = 4,
		All = NotInstalled | InstalledAS | InstalledSys
	}
	
	public class PackageListView : ListView
	{

		PackageListsManager pkgListMan = null;
		
		PackageListViewPkgTypeFilter filteringType = PackageListViewPkgTypeFilter.All;
		
		string filteringKeyword = null;
		
		[Category("Action")]
		public event EventHandler FilterUpdated;
		
		public PackageListView()
		{
		}
		
		/// <summary>
		/// パッケージリストのデータを設定・取得する。
		/// </summary>
		[Category("Behavior")]
		[DefaultValue(null)]
		public PackageListsManager Data
		{
			get {	return this.pkgListMan;	}
			set {
				this.pkgListMan = value;
				
				if (this.Visible) {
					UpdateItems();
				}
			}
		}
		
		/// <summary>
		/// 表示パッケージ種類フィルタを設定・取得する。
		/// </summary>
		[Category("Behavior")]
		[DefaultValue(PackageListViewPkgTypeFilter.All)]
		public PackageListViewPkgTypeFilter FilteringType {
			get { return filteringType; }
			set {
				if (filteringType != value) {
					filteringType = value;
					
					if (this.Visible) {
						UpdateItems();
					}
					
					OnFilterUpdated(new EventArgs());
				}
			}
		}
		
		/// <summary>
		/// 表示の際のフィルタリングキーワード
		/// </summary>
		[Category("Behavior")]
		[DefaultValue(typeof(string), null)]
		public string FilteringKeyword {
			get { return filteringKeyword; }
			set {
				if (filteringKeyword != value) {
					filteringKeyword = value;
					
					if (this.Visible) {
						UpdateItems();
					}
					
					OnFilterUpdated(new EventArgs());
				}
			}
		}
				
		/// <summary>
		/// 選択されたパッケージを1つ返す
		/// </summary>
		public Package SelectedPackage {
			get {
				if (SelectedItems.Count > 0) {
					return (Package) (SelectedItems[0].Tag);
				} else {
					return null;
				}
			}
		}
		
		/// <summary>
		/// 選択されたパッケージをイテレータとして返す
		/// </summary>
		public IEnumerable<Package> SelectedPackages {
			get {
				foreach (ListViewItem item in SelectedItems) {
					yield return (Package) item.Tag;
				}
			}
		}
		
		#region データ領域作成メソッド群
		
		private static ListViewItem createListViewItemForPackage(Package pkg, ImageCategory imageKey)
		{
			string[] labels = new string[]{
				pkg.Name, pkg.Version, pkg.Summary,
			};
			
			ListViewItem item = new ListViewItem(labels);
			item.Tag = pkg;
			item.ToolTipText = pkg.Summary;
			item.ImageKey = ImageCategory_ToString(imageKey);
			
			return item;
		}
		
		public void UpdateItems()
		{
			string ImageKeyAvailable = ImageCategory_ToString(ImageCategory.Available);
			string ImageKeyAvailableNew = ImageCategory_ToString(ImageCategory.AvailableNew);
			string ImageKeyInstalled = ImageCategory_ToString(ImageCategory.Installed);
			string ImageKeySystem = ImageCategory_ToString(ImageCategory.System);
			string keyword = filteringKeyword ?? string.Empty;
			
			this.Items.Clear();
			
			// ソフトリストの中身のパッケージ
			if ((filteringType & PackageListViewPkgTypeFilter.NotInstalled) != 0) {
				foreach (Package pkg in pkgListMan.AvailablePkgList.Search(keyword)) {
					if (Installation.GetPreferInstallerIndex(pkg) >= 0) { // インストール可能
						bool isInstalledAS = (pkgListMan.InstalledPkgList.GetPackageForName(pkg.Name) != null);
						bool isInstalledSys = (pkgListMan.SystemInstalledPkgList.GetPackageForName(pkg.Name) != null);
						
						// インストールされていて、インストール済みソフトを表示しないならば、次のループへ
						if ((((filteringType & PackageListViewPkgTypeFilter.InstalledAS) == 0) && isInstalledAS) ||
						    (((filteringType & PackageListViewPkgTypeFilter.InstalledSys) == 0) && isInstalledSys)) {
							continue;
						}
						
						ImageCategory cat = (isInstalledAS || isInstalledSys)? ImageCategory.Available : ImageCategory.AvailableNew;
						Items.Add(createListViewItemForPackage(pkg, cat));
					}
				}
			}
			
			// AppliStationにインストール済みのパッケージ
			if ((filteringType & PackageListViewPkgTypeFilter.InstalledAS) != 0) {
				foreach (Package pkg in pkgListMan.InstalledPkgList.Search(keyword)) {
					Items.Add(createListViewItemForPackage(pkg, ImageCategory.Installed));
				}
			}
			
			// PCにインストール済みのパッケージ
			if ((filteringType & PackageListViewPkgTypeFilter.InstalledSys) != 0) {
				foreach (Package pkg in pkgListMan.SystemInstalledPkgList.Search(keyword)) {
					Items.Add(createListViewItemForPackage(pkg, ImageCategory.System));
				}
			}
			
			this.Refresh();
		}
		
		protected enum ImageCategory {
			Available,
			AvailableNew,
			Installed,
			System,
		};
		
		protected static string ImageCategory_ToString(ImageCategory cat)
		{
			switch (cat) {
			case ImageCategory.Available:		return "available";
			case ImageCategory.AvailableNew:	return "available-new";
			case ImageCategory.Installed:		return "installed";
			case ImageCategory.System:			return "sys";
			default:							return string.Empty;
			}
		}
		
		#endregion
		
		protected virtual void OnFilterUpdated(EventArgs e)
		{
			if (FilterUpdated != null) {
				FilterUpdated(this, e);
			}
		}
		
		#region Sort関連
		
		AppliStation.Util.ListViewItemSortComparer sortComparer;
		
		protected override void OnColumnClick(ColumnClickEventArgs e)
		{
			if (this.HeaderStyle == ColumnHeaderStyle.Clickable) {
				onColumnClick(e);
			}
			
			base.OnColumnClick(e);
		}
		
		private void onColumnClick(ColumnClickEventArgs e)
		{
			SortOrder order = SortOrder.None;
			
			if (sortComparer == null) {
				order = SortOrder.Ascending;
				sortComparer = new AppliStation.Util.ListViewItemSortComparer(e.Column, order);
				ListViewItemSorter = sortComparer;
			} else {
				if (sortComparer.Column == e.Column) {
					order = (sortComparer.Order == SortOrder.Ascending)? SortOrder.Descending : SortOrder.Ascending;
					
					sortComparer.Order = order;
				} else {
					order = sortComparer.Order;
					sortComparer.Column = e.Column;
				}
				
				Sort();
			}
			AppliStation.Util.NativeMethods.ColumnHeader_SetSortState(this, e.Column, order);
			
			// ソート対象列の色付け
			try {
				// SendMessage(hWnd, LVM_SETSELECTEDCOLUMN, column, NULL);
				AppliStation.Util.NativeMethods.SendMessage(this.Handle, 0x1000+140, new IntPtr(e.Column), IntPtr.Zero);
			} catch (Exception) {	
			}
		}
		
		#endregion
	}
}