/* 
 * Copyright (c) 2009 Craig Sutherland
 * 
 * Permission is hereby granted, free of charge, to any person
 * obtaining a copy of this software and associated documentation
 * files (the "Software"), to deal in the Software without
 * restriction, including without limitation the rights to use,
 * copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the
 * Software is furnished to do so, subject to the following
 * conditions:
 * 
 * The above copyright notice and this permission notice shall be
 * included in all copies or substantial portions of the Software.
 * 
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
 * OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
 * HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
 * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
 * OTHER DEALINGS IN THE SOFTWARE.
 */

using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using System.Xml;
using System.Xml.Xsl;
using ThoughtWorks.CruiseControl.Remote.Monitor;
using FastForward.WinCore.Configuration;

namespace FastForward.Monitor
{
    /// <summary>
    /// Display the build history for a project.
    /// </summary>
    public partial class BuildHistoryForm 
        : Form
    {
        #region Private fields
        private Project project;
        private ApplicationConfig configuration;
        private ProjectBuild currentBuild;
        private bool isLoaded;
        private Dictionary<string, XslCompiledTransform> templates = new Dictionary<string, XslCompiledTransform>();
        #endregion

        #region Constructors
        /// <summary>
        /// Initialise a new <see cref="BuildHistoryForm"/>.
        /// </summary>
        /// <param name="project"></param>
        /// <param name="configuration"></param>
        /// <param name="owner"></param>
        public BuildHistoryForm(Project project, ApplicationConfig configuration, Form owner)
        {
            InitializeComponent();
            this.project = project;
            this.configuration = configuration;
            Text = "Build History: " + project.Name;
            LoadTemplates();
            RefreshData();
            Owner = owner;

            // Initialise the browser
            using (var templateStream = this.GetType().Assembly.GetManifestResourceStream("FastForward.Monitor.BuildTemplate.htm"))
            {
                using (var reader = new StreamReader(templateStream))
                {
                    var template = reader.ReadToEnd();
                    viewBrowser.DocumentText = template;
                }
            }
        }
        #endregion

        #region Private methods
        #region LoadTemplates()
        /// <summary>
        /// Load the available templates.
        /// </summary>
        private void LoadTemplates()
        {
            activeView.Items.Add(new BuildTemplateConfig
            {
                Name = "System",
                FileName = "FastForward.Monitor.BuildSystemTemplate.xsl",
                IsResource = true
            });
            activeView.Items.AddRange(configuration.BuildTemplates.ToArray());
            activeView.SelectedIndex = 0;
            activeView.SelectedIndexChanged += (o, e) => RefreshView();
        }
        #endregion

        #region RefreshData()
        /// <summary>
        /// Refresh the list of builds.
        /// </summary>
        private void RefreshData()
        {
            buildsList.Items.Clear();
            var orderedBuilds = (from record in project.Builds
                                 orderby record.BuildDate descending
                                 select record);
            foreach (var build in orderedBuilds)
            {
                var status = build.IsSuccessful ? "Success" : "Failure"; 
                var item = new ListViewItem(new string[] {
                    build.BuildDate.ToString(),
                    build.Label ?? string.Empty,
                    status
                }, status);
                item.Tag = build;
                buildsList.Items.Add(item);
            }
            if (orderedBuilds.Count() > 0)
            {
                currentBuild = orderedBuilds.First();
            }

            RefreshView();
        }
        #endregion

        #region RefreshView()
        /// <summary>
        /// Refreshes the current view.
        /// </summary>
        private void RefreshView()
        {
            if (isLoaded) viewBrowser.Document.Body.InnerHtml = GenerateView();
        }
        #endregion

        #region GenerateView()
        /// <summary>
        /// Generates the view to display.
        /// </summary>
        /// <returns></returns>
        private string GenerateView()
        {
            var currentTemplate = activeView.SelectedItem as BuildTemplateConfig;
            if (!templates.ContainsKey(currentTemplate.Name))
            {
                // Load the XSL-T template
                var newXslt = new XslCompiledTransform();
                if (currentTemplate.IsResource)
                {
                    using (var templateStream = this.GetType().Assembly.GetManifestResourceStream(currentTemplate.FileName))
                    {
                        using (var reader = XmlReader.Create(templateStream))
                        {
                            newXslt.Load(reader);
                        }
                    }
                }
                else
                {
                    newXslt.Load(currentTemplate.FileName);
                }
                templates.Add(currentTemplate.Name, newXslt);
            }

            // Generate the output
            var output = new StringBuilder();
            try
            {
                using (var input = new StringReader(currentBuild.Log))
                {
                    using (var reader = XmlReader.Create(input))
                    {
                        using (var writer = XmlWriter.Create(output))
                        {
                            templates[currentTemplate.Name].Transform(reader, writer);
                        }
                    }
                }
            }
            catch (Exception error)
            {
                output.AppendFormat("Unable to read log: {0}", error.Message);
            }

            // Return the transformed view
            return output.ToString();
        }
        #endregion
        #endregion

        #region Event handlers
        #region refreshButton_Click()
        /// <summary>
        /// The refresh button was clicked.
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void refreshButton_Click(object sender, EventArgs e)
        {
            RefreshData();
        }
        #endregion

        #region buildsList_ItemSelectionChanged()
        /// <summary>
        /// Handle an item being selected.
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void buildsList_ItemSelectionChanged(object sender, ListViewItemSelectionChangedEventArgs e)
        {
            if (buildsList.SelectedItems.Count == 1)
            {
                currentBuild = buildsList.SelectedItems[0].Tag as ProjectBuild;
                RefreshView();
            }
        }
        #endregion

        #region viewBrowser_DocumentCompleted()
        /// <summary>
        /// The template has loaded, now we can load the actual data.
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void viewBrowser_DocumentCompleted(object sender, WebBrowserDocumentCompletedEventArgs e)
        {
            isLoaded = true;
            viewBrowser.Document.Body.InnerHtml = GenerateView();
        }
        #endregion

        #region saveButton_Click()
        /// <summary>
        /// Allow the user to save the current report.
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void saveButton_Click(object sender, EventArgs e)
        {
            viewBrowser.ShowSaveAsDialog();
        }
        #endregion

        #region printButton_Click()
        /// <summary>
        /// Allow the user to print the current report.
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void printButton_Click(object sender, EventArgs e)
        {
            viewBrowser.ShowPrintDialog();
        }
        #endregion
        #endregion
    }
}