#region License Information
/* HeuristicLab
 * Copyright (C) 2002-2015 Heuristic and Evolutionary Algorithms Laboratory (HEAL)
 *
 * This file is part of HeuristicLab.
 *
 * HeuristicLab is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * HeuristicLab is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with HeuristicLab. If not, see <http://www.gnu.org/licenses/>.
 */
#endregion

using System;
using System.Collections.Generic;
using System.Drawing;
using System.IO;
using System.Linq;
using System.Reflection;
using System.Text.RegularExpressions;
using System.Windows.Forms;

namespace HeuristicLab.PluginInfrastructure.UI {
  /// <summary>
  /// Shows information on all discovered plugins.
  /// </summary>
  public partial class PluginInformationDialog : Form {
    public PluginInformationDialog(IEnumerable<IPluginDescription> plugins) {
      InitializeComponent();
      var entryAssembly = Assembly.GetEntryAssembly();
      productTextBox.Text = GetProduct(entryAssembly);
      versionTextBox.Text = entryAssembly.GetFileVersion();
      contactTextBox.Text = GetCopyright(entryAssembly);
      imageList.Images.Add(Resources.Plugin);
      textBox.Text = Resources.LicenseText;
      PopulatePluginList(plugins);
      ActiveControl = okButton;
    }

    private void PopulatePluginList(IEnumerable<IPluginDescription> plugins) {
      pluginListView.Items.Clear();
      foreach (var plugin in plugins) {
        ListViewItem pluginItem = CreateListViewItem(plugin);
        pluginListView.Items.Add(pluginItem);
      }
    }

    private ListViewItem CreateListViewItem(IPluginDescription plugin) {
      ListViewItem item = new ListViewItem(new string[] { plugin.Name, plugin.Version.ToString(), plugin.Description }) {
        Name = plugin.Name,
        Tag = plugin,
        ImageIndex = 0
      };

      // set sub-item names to make sure they are shown in the corresponding columns of the ListView
      item.SubItems[0].Name = "Name";
      item.SubItems[1].Name = "Version";
      item.SubItems[2].Name = "Description";
      return item;
    }

    private string GetCopyright(Assembly asm) {
      AssemblyCopyrightAttribute attribute = GetAttribute<AssemblyCopyrightAttribute>(asm);
      return attribute.Copyright;
    }

    private string GetProduct(Assembly asm) {
      AssemblyProductAttribute attribute = GetAttribute<AssemblyProductAttribute>(asm);
      return attribute.Product;
    }

    private T GetAttribute<T>(Assembly asm) {
      return (T)asm.GetCustomAttributes(typeof(T), false).Single();
    }

    private void okButton_Click(object sender, EventArgs e) {
      Close();
    }

    private void pluginListView_ItemActivate(object sender, EventArgs e) {

    }
    private void pluginListView_ItemSelectionChanged(object sender, ListViewItemSelectionChangedEventArgs e) {
      if (e.IsSelected) {
        pluginListView.EnsureVisible(e.ItemIndex);
        ShowPluginInformation((IPluginDescription)e.Item.Tag);
        pluginListView.Select(); // focus plugin list view to highlight selected tile
      }
    }

    private void ShowPluginInformation(IPluginDescription pluginDescription) {
      productTextBox.Text = pluginDescription.Name;
      versionTextBox.Text = pluginDescription.Version.ToString();
      contactTextBox.Text = pluginDescription.ContactName + " " + pluginDescription.ContactEmail;
      stateTextBox.Text = pluginDescription.PluginState.ToString();

      textBox.Text = string.Empty;
      textBox.AppendText(pluginDescription.Description + Environment.NewLine + Environment.NewLine);

      if (!string.IsNullOrEmpty(pluginDescription.LoadingErrorInformation)) {
        var startSel = textBox.TextLength;
        textBox.AppendText("Error loading: " + pluginDescription.LoadingErrorInformation);
        textBox.SelectionStart = startSel;
        textBox.SelectionLength = textBox.TextLength;
        textBox.SelectionColor = Color.Red;
        textBox.AppendText(Environment.NewLine + Environment.NewLine);
      }

      textBox.AppendText("Files:" + Environment.NewLine);
      foreach (var f in pluginDescription.Files) {
        textBox.AppendText(f.Name); // might add icons for files here in the future
        textBox.AppendText(Environment.NewLine);
      }

      textBox.AppendText(Environment.NewLine);
      if (pluginDescription.Dependencies.Any())
        textBox.AppendText("Dependencies:" + Environment.NewLine);

      // foreach dependency add a new line and set the formatting

      foreach (var d in pluginDescription.Dependencies) {
        // remember starting pos for selection
        var start = textBox.Text.Length;
        textBox.AppendText(d.Name);
        textBox.SelectionStart = start;
        textBox.SelectionLength = d.Name.Length;
        textBox.SelectionColor = Color.RoyalBlue;
        textBox.AppendText(Environment.NewLine);
      }
      textBox.AppendText(Environment.NewLine);
      textBox.AppendText(pluginDescription.LicenseText);
    }

    private void licenseTextBox_LinkClicked(object sender, LinkClickedEventArgs e) {
      System.Diagnostics.Process.Start(e.LinkText);
    }

    private void webLinkLabel_LinkClicked(object sender, LinkLabelLinkClickedEventArgs e) {
      System.Diagnostics.Process.Start(webLinkLabel.Text);
    }

    private void mailLinkLabel_LinkClicked(object sender, LinkLabelLinkClickedEventArgs e) {
      System.Diagnostics.Process.Start("mailto:" + mailLinkLabel.Text);
    }

    // automatically adjust tile size to 100% width of listview
    private void pluginListView_ClientSizeChanged(object sender, EventArgs e) {
      pluginListView.TileSize = new Size(pluginListView.ClientSize.Width, pluginListView.TileSize.Height);
    }

    private void textBox_MouseClick(object sender, MouseEventArgs e) {
      var clickedWord = GetWordAtMousePos(e.Location);

      pluginListView.SelectedItems.Clear();

      // find and select first matching item
      for (int pi = 0; pi < pluginListView.Items.Count; pi++) {
        if (pluginListView.Items[pi].Text == clickedWord) {
          pluginListView.Items[pi].Selected = true;
          break;
        }
      }
    }

    private void textBox_MouseMove(object sender, MouseEventArgs e) {
      var wordUnderMouse = GetWordAtMousePos(e.Location);

      // find first matching item
      bool foundMatchingItem = false;
      for (int pi = 0; pi < pluginListView.Items.Count; pi++) {
        if (pluginListView.Items[pi].Text == wordUnderMouse) {
          foundMatchingItem = true;
          break;
        }
      }
      // set to hand if a match is found
      Cursor = foundMatchingItem ? Cursors.Hand : Cursors.Arrow;
    }
    private void textBox_MouseLeave(object sender, EventArgs e) {
      // make sure the cursor is set to default when the control is left
      Cursor = Cursors.Default;
    }

    private string GetWordAtMousePos(Point pos) {
      int i = textBox.GetCharIndexFromPosition(pos);
      if (i < 0 || i > textBox.TextLength) return string.Empty;
      var text = textBox.Text;
      // extract clicked string (left and right are whitespace
      int startPos = i; while (startPos >= 0 && !char.IsWhiteSpace(text[startPos])) startPos--;
      int endPos = i; while (endPos < textBox.TextLength && !char.IsWhiteSpace(text[endPos])) endPos++;
      if (startPos == endPos) return string.Empty;
      return text.Substring(startPos + 1, endPos - startPos - 1);
    }

  }
}