//=============================================================================

// System  : Sandcastle Guided Installation - Sandcastle Help File Builder

// File    : SandcastleHelpFileBuilderPage.cs

// Author  : Eric Woodruff

// Updated : 04/23/2011

// Note    : Copyright 2011, Eric Woodruff, All rights reserved

// Compiler: Microsoft Visual C#

//

// This file contains a page used to help the user install the Sandcastle Help

// File Builder.

//

// This code is published under the Microsoft Public License (Ms-PL).  A copy

// of the license should be distributed with the code.  It can also be found

// at the project website: http://SandcastleStyles.CodePlex.com.   This

// notice, the author's name, and all copyright notices must remain intact in

// all applications, documentation, and source files.

//

// Version     Date     Who  Comments

// ============================================================================

// 1.0.0.0  02/12/2011  EFW  Created the code

//=============================================================================



using System;

using System.Collections.Generic;

using System.Diagnostics;

using System.IO;

using System.Windows.Forms;

using System.Xml.Linq;



using Sandcastle.Installer.InstallerPages;



using Sandcastle.Installer.SHFB.Properties;



namespace Sandcastle.Installer.SHFB

{

    /// <summary>

    /// This page is used to help the user install the Sandcastle Help File

    /// Builder.

    /// </summary>

    public partial class SandcastleHelpFileBuilderPage : Sandcastle.Installer.InstallerPages.BasePage

    {

        #region Private data members

        //=====================================================================



        private string shfbFolder, installerName;

        private bool searchPerformed, suggestReboot;

        private Version frameworkVersion, shfbVersion;

        #endregion



        #region Properties

        //=====================================================================



        /// <inheritdoc />

        public override string PageTitle

        {

            get { return "Sandcastle Help File Builder"; }

        }



        /// <inheritdoc />

        /// <remarks>This returns the .NET Framework version required by the

        /// Sandcastle Help File Builder installed by this release of the

        /// package.</remarks>

        public override Version RequiredFrameworkVersion

        {

            get { return frameworkVersion; }

        }



        /// <summary>

        /// This is overridden to prevent continuing until the Sandcastle

        /// tools are installed.

        /// </summary>

        public override bool CanContinue

        {

            get

            {

                if(String.IsNullOrEmpty(shfbFolder))

                {

                    MessageBox.Show("The Sandcastle Help File Builder must be installed in order to install " +

                        "the remainder of the tools in this package.  Follow the instructions on this " +

                        "page to install them.", this.PageTitle, MessageBoxButtons.OK, MessageBoxIcon.Exclamation);

                    return false;

                }



                return base.CanContinue;

            }

        }



        /// <summary>

        /// This is overridden to return true if the installer was executed.

        /// </summary>

        public override bool SuggestReboot

        {

            get { return suggestReboot; }

        }



        /// <summary>

        /// This is overridden to return a completion action that offers to

        /// open the SHFB help file.

        /// </summary>

        public override IEnumerable<CompletionAction> CompletionActions

        {

            get

            {

                if(!String.IsNullOrEmpty(shfbFolder))

                    yield return new CompletionAction

                    {

                        Description = "Open the Sandcastle Help File Builder help file",

                        Action = new Action(() =>

                        {

                            Utility.Open(Path.Combine(shfbFolder, "SandcastleBuilder.chm"));

                        })

                    };

            }

        }



        /// <summary>

        /// This is used to retrieve the help file builder version

        /// </summary>

        public Version HelpFileBuilderVersion

        {

            get { return shfbVersion; }

        }

        #endregion



        #region Constructor

        //=====================================================================



        /// <summary>

        /// Constructor

        /// </summary>

        public SandcastleHelpFileBuilderPage()

        {

            InitializeComponent();

        }

        #endregion



        #region Method overrides

        //=====================================================================



        /// <inheritdoc />

        public override void Initialize(XElement configuration)

        {

            if(configuration.Attribute("frameworkVersion") == null)

                throw new InvalidOperationException("A frameworkVersion attribute value is required");



            if(configuration.Attribute("shfbVersion") == null)

                throw new InvalidOperationException("A shfbVersion attribute value is required");



            if(configuration.Attribute("installerName") == null)

                throw new InvalidOperationException("An installer attribute value is required");



            frameworkVersion = new Version(configuration.Attribute("frameworkVersion").Value);

            shfbVersion = new Version(configuration.Attribute("shfbVersion").Value);

            installerName = configuration.Attribute("installerName").Value;



            base.Initialize(configuration);

        }



        /// <summary>

        /// This is overridden to figure out if the Sandcastle Help File

        /// Builder is installed.

        /// </summary>

        public override void ShowPage()

        {

            FileVersionInfo fvi;

            Version installedVersion;

            string body = Resources.HelpFileBuilderPageBody, errorMessage = null;



            if(searchPerformed)

                return;



            btnInstallSHFB.Visible = false;



            try

            {

                Cursor.Current = Cursors.WaitCursor;

                searchPerformed = false;



                // SHFBROOT will exist as a system environment variable if it is installed correctly

                shfbFolder = Environment.GetEnvironmentVariable("SHFBROOT", EnvironmentVariableTarget.Machine);



                if(!String.IsNullOrEmpty(shfbFolder))

                {

                    // If there is an installed version, make sure it is older than what we expect

                    if(!Directory.Exists(shfbFolder) || !File.Exists(Path.Combine(shfbFolder,

                      "SHFBProjectLauncher.exe")))

                        installedVersion = new Version(0, 0, 0, 0);

                    else

                    {

                        fvi = FileVersionInfo.GetVersionInfo(Path.Combine(shfbFolder, "SHFBProjectLauncher.exe"));



                        installedVersion = new Version(fvi.FileMajorPart, fvi.FileMinorPart, fvi.FileBuildPart,

                            fvi.FilePrivatePart);

                    }



                    if(installedVersion < shfbVersion)

                        shfbFolder = null;

                    else

                    {

                        // If the version is greater, we can't go on as this package is out of date

                        if(installedVersion > shfbVersion)

                        {

                            shfbFolder = null;

                            this.scSplitter.Panel2Collapsed = true;

                            this.DisplayHtml(body + "<h2>Newer Version Detected</h2><p />It has been determined " +

                                "that a newer version of the Sandcastle Help File Builder is installed on this " +

                                "system.  You will need to download a newer version of this package that is " +

                                "compatible with this more recent release of it.");

                            return;

                        }

                    }

                }

            }

            catch(Exception ex)

            {

                errorMessage = "An error occurred while searching for the Sandcastle Help File Builder:<br /><br /> " +

                    ex.Message;

            }

            finally

            {

                Cursor.Current = Cursors.Default;

                searchPerformed = true;

            }



            if(errorMessage != null)

            {

                this.DisplayHtml(body + "<div class='Error'><p />" + errorMessage + "</div>");

                return;

            }



            if(!String.IsNullOrEmpty(shfbFolder))

            {

                this.scSplitter.Panel2Collapsed = true;

                this.DisplayHtml(body + "<h2>Sandcastle Help File Builder Found</h2><p />It has been " +

                    "determined that the Sandcastle Help File Builder is installed on this system (Location: " +

                    "<i>" + shfbFolder + "</i>).  No further action is required in this step.\r\n<p />Click " +

                    "the <b>Next</b> button to continue.");

                return;

            }



            btnInstallSHFB.Visible = btnInstallSHFB.Enabled = true;

            this.DisplayHtml(body + "<p />The Sandcastle Help File Builder could not be found on this system.  " +

                "Please click the <b>Install SHFB</b> button below.  A separate installer will be launched to " +

                "perform the installation.  Once it has completed, return to this application to continue " +

                "installing the remainder of the tools.  You may need to reboot when done so that changes to " +

                "the system environment variables take effect.");

        }

        #endregion



        #region Event handlers

        //=====================================================================



        /// <summary>

        /// Install the Sandcastle Help File Builder and show the results

        /// </summary>

        /// <param name="sender">The sender of the event</param>

        /// <param name="e">The event arguments</param>

        private void btnInstallSHFB_Click(object sender, EventArgs e)

        {

            searchPerformed = suggestReboot = false;

            btnInstallSHFB.Enabled = false;



            bool launched = Utility.RunInstaller(Path.Combine(Utility.InstallResourcesPath, installerName), null,

                (exitCode) =>

                {

                    suggestReboot = true;

                    pbWait.Visible = lblInstalling.Visible = false;

                    this.ShowPage();

                },

                (ex) =>

                {

                    pbWait.Visible = lblInstalling.Visible = false;

                    MessageBox.Show("Unable to execute installer: " + ex.Message, this.PageTitle,

                        MessageBoxButtons.OK, MessageBoxIcon.Error);

                });



            if(launched)

                pbWait.Visible = lblInstalling.Visible = true;

        }

        #endregion

    }

}