/* 
 * 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.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using ThoughtWorks.CruiseControl.Remote.Monitor;
using ThoughtWorks.CruiseControl.Remote;
using FastForward.WinCore;
using System.Diagnostics;
using System.IO;

namespace FastForward.Monitor
{
    /// <summary>
    /// Displays the packages available for a project.
    /// </summary>
    public partial class PackagesForm 
        : Form
    {
        #region Private fields
        private Project project;
        private object lockObject = new object();
        private bool isRefreshing = false;
        private IEnumerable<PackageDetails> packages;
        private Exception lastError;
        private Stopwatch loadStopwatch = new Stopwatch();
        #endregion

        #region Constructors
        /// <summary>
        /// Initialise a new <see cref="PackagesForm"/>.
        /// </summary>
        /// <param name="project"></param>
        /// <param name="owner"></param>
        public PackagesForm(Project project, Form owner)
        {
            InitializeComponent();
            this.project = project;
            Owner = owner;
            Text = "Packages List: " + project.Name;
            RefreshData();
        }
        #endregion

        #region Private methods
        #region RefreshData()
        /// <summary>
        /// Refresh the data.
        /// </summary>
        private void RefreshData()
        {
            var canRefresh = false;

            // Check if a refresh is already running
            lock (lockObject)
            {
                canRefresh = !isRefreshing;
                isRefreshing = true;
            }

            // Trigger the refresh
            if (canRefresh)
            {
                loadStopwatch.Reset();
                loadStopwatch.Start();
                downloadWorker.RunWorkerAsync();
            }
        }
        #endregion

        #region DownloadPackage()
        /// <summary>
        /// Downloads the currently selected package.
        /// </summary>
        private void DownloadPackage()
        {
            if (packagesList.SelectedItems.Count == 0)
            {
                MessageBox.Show(this,
                    "You have not selected a package to download",
                    "Unable to download",
                    MessageBoxButtons.OK, 
                    MessageBoxIcon.Warning);
            }
            else
            {
                // Generate the default file name
                var selectedPackage = packagesList.SelectedItems[0].Tag as PackageDetails;
                var defaultFile = Path.Combine(Environment.GetFolderPath(Environment.SpecialFolder.MyDocuments),
                    selectedPackage.Name + ".zip");

                // Prompt the user where they want to save it
                var saveDialog = new SaveFileDialog
                {
                    AddExtension = false,
                    AutoUpgradeEnabled = true,
                    CheckPathExists = true,
                    FileName = defaultFile,
                    Filter = "All files (*.*)|*.*",
                    FilterIndex = 1,
                    OverwritePrompt = true,
                    InitialDirectory = Path.GetDirectoryName(defaultFile),
                    RestoreDirectory = true,
                    Title = "Download Package Location"
                };
                if (saveDialog.ShowDialog(this) == DialogResult.OK)
                {
                    // Perform the actual download
                    // In future, this could be converted to a background process
                    try
                    {
                        var fileTransfer = project.Server.Client.RetrieveFileTransfer(project.Name, selectedPackage.FileName);
                        if (fileTransfer == null) throw new Exception("Unable to retrieve file!");
                        if (File.Exists(saveDialog.FileName)) File.Delete(saveDialog.FileName);
                        using (var file = File.Create(saveDialog.FileName))
                        {
                            fileTransfer.Download(file);
                        }

                        // See if the user wants to open the package
                        if (MessageBox.Show(this,
                            "Package downloaded, would you like to open it now?",
                            "Download finished",
                            MessageBoxButtons.YesNo,
                            MessageBoxIcon.Information) == DialogResult.Yes)
                        {
                            // Open the package
                            var openFile = new Process();
                            openFile.StartInfo = new ProcessStartInfo
                            {
                                FileName = saveDialog.FileName,
                                UseShellExecute = true
                            };
                            openFile.Start();
                        }
                    }
                    catch (Exception error)
                    {
                        // Tell the user if there were any problems
                        statusLabel.Text = "Unable to download package: " + error.Message;
                    }
                }
            }
        }
        #endregion
        #endregion

        #region Event handlers
        #region downloadButton_Click()
        /// <summary>
        /// The user has clicked on the download button.
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void downloadButton_Click(object sender, EventArgs e)
        {
            DownloadPackage();
        }
        #endregion

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

        #region packagesList_DoubleClick()
        /// <summary>
        /// The user has double-clicked on a package.
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void packagesList_DoubleClick(object sender, EventArgs e)
        {
            DownloadPackage();
        }
        #endregion

        #region downloadWorker_DoWork()
        /// <summary>
        /// The worker needs to download the packages.
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void downloadWorker_DoWork(object sender, DoWorkEventArgs e)
        {
            lastError = null;
            try
            {
                packages = project.Server.Client.RetrievePackageList(project.Name);
            }
            catch (Exception error)
            {
                packages = new List<PackageDetails>();
                lastError = error;
            }
        }
        #endregion

        #region downloadWorker_RunWorkerCompleted()
        /// <summary>
        /// The packages have been downloaded.
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void downloadWorker_RunWorkerCompleted(object sender, RunWorkerCompletedEventArgs e)
        {
            // Load all the packages
            packagesList.BeginUpdate();
            try
            {
                packagesList.Items.Clear();
                foreach (var package in packages)
                {
                    var item = new ListViewItem(new string[] {
                        package.Name,
                        package.BuildLabel,
                        package.DateTime.ToString("g"),
                        package.NumberOfFiles.ToString(),
                        StringUtils.FormatFileSize(package.Size)
                    }, "Package");
                    item.Tag = package;
                    packagesList.Items.Add(item);
                }

                loadStopwatch.Stop();
                if (lastError == null)
                {
                    statusLabel.Text = string.Format("List loaded: {0:0.00}s", loadStopwatch.Elapsed.TotalSeconds);
                }
                else
                {
                    statusLabel.Text = "Unable to list packages: " + lastError.Message;
                }
            }
            finally
            {
                packagesList.EndUpdate();
            }

            // Unlock the refresh process
            lock (lockObject)
            {
                isRefreshing = false;
            }
        }
        #endregion
        #endregion
    }
}