using FastReport.Cloud.StorageClient;
using FastReport.Cloud.StorageClient.Dropbox;
using FastReport.Cloud.StorageClient.FastCloud;
using FastReport.Cloud.StorageClient.Ftp;
using FastReport.Cloud.StorageClient.S3;
using FastReport.Controls;
using FastReport.Design;
using FastReport.Export;
using FastReport.Messaging;
using FastReport.Utils;
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Drawing;
using System.Drawing.Design;
using System.IO;
using System.Windows.Forms;
#if !AVALONIA
using FastReport.Cloud.StorageClient.Box;
using FastReport.Cloud.StorageClient.GoogleDrive;
using FastReport.Cloud.StorageClient.SkyDrive;
using Box = FastReport.Cloud.StorageClient.Box;
using GoogleDrive = FastReport.Cloud.StorageClient.GoogleDrive;
using SkyDrive = FastReport.Cloud.StorageClient.SkyDrive;
#endif
#if !DEBUG
using FastReport.Forms;
#endif

namespace FastReport.Preview
{
    /// <summary>
    /// Represents a Windows Forms control used to preview a report.
    /// </summary>
    /// <remarks>
    /// To use this control, place it on a form and link it to a report using the report's
    /// <see cref="FastReport.Report.Preview"/> property. To show a report, call 
    /// the <b>Report.Show</b> method:
    /// <code>
    /// report1.Preview = previewControl1;
    /// report1.Show();
    /// </code>
    /// <para>Use this control's methods such as <see cref="Print"/>, <see cref="Save()"/> etc. to
    /// handle the preview. Call <see cref="Clear"/> method to clear the preview.</para>
    /// <para>You can specify whether the standard toolbar is visible in the <see cref="ToolbarVisible"/>
    /// property. The <see cref="StatusbarVisible"/> property allows you to hide/show the statusbar.
    /// </para>
    /// </remarks>
    [ToolboxItem(true), ToolboxBitmap(typeof(Report), "Resources.PreviewControl.bmp")]
    public partial class PreviewControl : UserControl
    {
        #region Fields
        private Report report;
        private List<PreviewTab> documents;
        private bool toolbarVisible;
        private bool statusbarVisible;
        private Color pageBorderColor;
        private Color activePageBorderColor;
        private PreviewButtons buttons;
        private PreviewExports exports;
        private PreviewClouds clouds;
        private float defaultZoom;
        private bool locked;
        private PreviewTab currentPreview;
        private bool fastScrolling;
        private Timer uploadTimer;
        private UIStyle uiStyle;
        private bool useBackColor;
        private FRTabControl tabControl;
        private Point pageOffset;
        private string saveInitialDirectory;
        private ToolStripZoomControl zoomControl;
        private bool updatingZoom;
        #endregion

        #region Properties
        /// <summary>
        /// Occurs when current page number is changed.
        /// </summary>
        public event EventHandler PageChanged;

        /// <summary>
        /// Occurs when UIStyle property is changed.
        /// </summary>
        public event EventHandler UIStyleChanged;

        /// <summary>
        /// Gets a reference to the report.
        /// </summary>
        [Browsable(false)]
        [DesignerSerializationVisibility(DesignerSerializationVisibility.Hidden)]
        public Report Report
        {
            get { return report; }
        }

        /// <summary>
        /// Obsolete. Gets or sets the color of page border.
        /// </summary>
        [Browsable(false)]
        [DesignerSerializationVisibility(DesignerSerializationVisibility.Hidden)]
        [EditorBrowsable(EditorBrowsableState.Never)]
        public Color PageBorderColor
        {
            get { return pageBorderColor; }
            set { pageBorderColor = value; }
        }

        /// <summary>
        /// Gets or sets the color of active page border.
        /// </summary>
        [DefaultValue(typeof(Color), "255, 199, 60")]
        public Color ActivePageBorderColor
        {
            get { return activePageBorderColor; }
            set { activePageBorderColor = value; }
        }

        /// <summary>
        /// Gets or sets the first page offset from the top left corner of the control.
        /// </summary>
        public Point PageOffset
        {
            get { return pageOffset; }
            set { pageOffset = value; }
        }

        /// <summary>
        /// Gets or sets a value indicating whether the toolbar is visible.
        /// </summary>
        [DefaultValue(true)]
        public bool ToolbarVisible
        {
            get { return toolbarVisible; }
            set
            {
                toolbarVisible = value;
                toolStrip.Visible = value;
            }
        }

        /// <summary>
        /// Gets or sets a value indicating whether the statusbar is visible.
        /// </summary>
        [DefaultValue(true)]
        public bool StatusbarVisible
        {
            get { return statusbarVisible; }
            set
            {
                statusbarVisible = value;
                statusStrip.Visible = value;
            }
        }

        /// <summary>
        /// Gets or sets a value indicating whether the outline control is visible.
        /// </summary>
        [DefaultValue(false)]
        public bool OutlineVisible
        {
            get { return outlineControl.Visible; }
            set
            {
                splitContainer1.Panel1Collapsed = !value;
                outlineControl.Visible = value;
                btnOutline.Checked = value;
            }
        }

        /// <summary>
        /// Specifies the set of buttons available in the toolbar.
        /// </summary>
        [DefaultValue(PreviewButtons.All)]
        public PreviewButtons Buttons
        {
            get { return buttons; }
            set
            {
                buttons = value;
                UpdateButtons();
            }
        }

        /// <summary>
        /// Specifies the set of exports that will be available in the preview's "save" menu.
        /// </summary>
        [DefaultValue(PreviewExports.All)]
        public PreviewExports Exports
        {
            get { return exports; }
            set
            {
                exports = value;
                UpdateButtons();
            }
        }

        /// <summary>
        /// Specifies the set of exports in clouds that will be available in the preview's "save" menu.
        /// </summary>
        [DefaultValue(PreviewClouds.All)]
        public PreviewClouds Clouds
        {
            get { return clouds; }
            set
            {
                clouds = value;
                UpdateButtons();
            }
        }

        /// <summary>
        /// Gets or sets a value indicating whether the fast scrolling method should be used.
        /// </summary>
        /// <remarks>
        /// If you enable this property, the gradient background will be disabled.
        /// </remarks>
        [DefaultValue(false)]
        public bool FastScrolling
        {
            get { return fastScrolling; }
            set { fastScrolling = value; }
        }

        /// <summary>
        /// Gets or sets the visual style.
        /// </summary>
        public UIStyle UIStyle
        {
            get { return uiStyle; }
            set
            {
                uiStyle = value;
                UpdateUIStyle();
                UIStyleChanged?.Invoke(this, EventArgs.Empty);
            }
        }

        /// <summary>
        /// Gets or sets a value indicating that the BackColor property must be used to draw the background area.
        /// </summary>
        /// <remarks>
        /// By default, the background area is drawn using the color defined in the current <b>UIStyle</b>.
        /// </remarks>
        [DefaultValue(false)]
        public bool UseBackColor
        {
            get { return useBackColor; }
            set
            {
                useBackColor = value;
                UpdateUIStyle();
            }
        }

        /// <summary>
        /// Gets the preview window's toolbar.
        /// </summary>
        [Browsable(false), DesignerSerializationVisibility(DesignerSerializationVisibility.Hidden)]
        public ToolStrip ToolBar
        {
            get { return toolStrip; }
        }

        /// <summary>
        /// Gets the preview window's statusbar.
        /// </summary>
        [Browsable(false), DesignerSerializationVisibility(DesignerSerializationVisibility.Hidden)]
        public StatusStrip StatusBar
        {
            get { return statusStrip; }
        }

        /// <summary>
        /// Gets or sets the initial directory that is displayed by a save file dialog.
        /// </summary>
        public string SaveInitialDirectory
        {
            get { return saveInitialDirectory; }
            set { saveInitialDirectory = value; }
        }

        internal float DefaultZoom
        {
            get { return defaultZoom; }
        }

        internal PreviewTab CurrentPreview
        {
            get { return currentPreview; }
        }

        private bool IsPreviewEmpty
        {
            get { return CurrentPreview == null || CurrentPreview.Disabled; }
        }
        #endregion

        #region Private Methods
        private void CreateOpenList()
        {
            var openLocal = new ToolStripMenuItem(Res.Get("Preview,OpenLocal"));
            openLocal.Image = this.GetImage(1);
            openLocal.Font = DrawUtils.DefaultFont;
            openLocal.Click += btnOpenLocal_Click;

            var openViaCloud = new ToolStripMenuItem(Res.Get("Preview,OpenViaCloud"));
            openViaCloud.Image = this.GetImage(261);
            openViaCloud.Font = DrawUtils.DefaultFont;
            openViaCloud.Click += btnOpenViaCloud_Click;
            
            btnOpen.DropDownItems.Clear();
            btnOpen.DropDownItems.AddRange(new ToolStripItem[] { openLocal, openViaCloud });
        }

        private void CreateSaveList()
        {
            var saveLocal = new ToolStripMenuItem(Res.Get("Preview,SaveLocal"));
            saveLocal.Font = DrawUtils.DefaultFont;
            saveLocal.Click += btnSaveLocal_Click;

            var saveToCloud = new ToolStripMenuItem(Res.Get("Preview,SaveToCloud"));
            saveToCloud.Image = this.GetImage(262);
            saveToCloud.Font = DrawUtils.DefaultFont;
            saveToCloud.Click += btnSaveToCloud_Click;

            var savePrepared = new ToolStripMenuItem(Res.Get("Preview,SaveNative"));
            savePrepared.Font = DrawUtils.DefaultFont;
            savePrepared.DropDownItems.AddRange(new ToolStripItem[] { saveLocal, saveToCloud });

            btnSave.DropDownItems.Clear();
            btnSave.DropDownItems.Add(savePrepared);

            CreateExportList(btnSave, Export_Click);
            CreateCloudList(btnSave, SaveToCloud_Click);
            //CreateMessengersList(btnSave, SendViaMessenger_Click);
        }

        private void CreateItems(ExportsOptions.ExportsTreeNode root, ToolStripDropDownItem button, EventHandler handler)
        {
            foreach (var node in root.Nodes)
            {
                if (node.IsCategory)
                {
                    var categoryItem = createButtonItem(node);
                    CreateItems(node, categoryItem, handler);
                    if (categoryItem.DropDownItems.Count > 0)
                        button.DropDownItems.Add(categoryItem);
                }
                else if (node.ExportType != null)
                {
                    bool enabled = node.Enabled;
                    if (node.IsExport)
                    {
                        if (Enum.TryParse<PreviewExports>(node.Tag.Object.Name, out var res))
                            enabled = (Exports & res) != 0;
                    }
                    else if (node.IsCloud)
                    {
                        if (Enum.TryParse<PreviewClouds>(node.Name, out var res))
                            enabled = (Clouds & res) != 0;
                    }
                    /*else if (node.IsMessenger)
                    {
                        if (Enum.TryParse<PreviewMessengers>(node.Name, out var res))
                            enabled = (Messengers & res) != 0;
                    }*/
                    if (enabled)
                    {
                        var item = createButtonItem(node);
                        item.Click += handler;
                        button.DropDownItems.Add(item);
                    }
                }
            }
        }

        private ToolStripMenuItem createButtonItem(ExportsOptions.ExportsTreeNode node)
        {
            var item = new ToolStripMenuItem(node.ToString() + (node.IsCategory ? "" : "..."));
            item.Tag = node.Tag;
            item.Name = node.Name;
            item.Image = node.Image ?? this.GetImage(node.ImageIndex);
            item.Font = DrawUtils.DefaultFont;
            return item;
        }

        private void CreateExportList(ToolStripDropDownItem button, EventHandler handler)
        {
            var options = ExportsOptions.GetInstance();
            CreateItems(options.ExportsMenu, button, handler);
        }

        private void CreateCloudList(ToolStripDropDownItem button, EventHandler handler)
        {
            var options = ExportsOptions.GetInstance();
            var categoryItem = createButtonItem(options.CloudMenu);
            CreateItems(options.CloudMenu, categoryItem, handler);
            if (categoryItem.DropDownItems.Count > 0)
            {
                button.DropDownItems.Add(new ToolStripSeparator());
                button.DropDownItems.Add(categoryItem);
            }
        }

        private void CreateMessengersList(ToolStripDropDownItem button, EventHandler handler)
        {
            var options = ExportsOptions.GetInstance();
            var categoryItem = createButtonItem(options.MessengerMenu);
            CreateItems(options.MessengerMenu, categoryItem, handler);
            if (categoryItem.DropDownItems.Count > 0)
            {
                button.DropDownItems.Add(new ToolStripSeparator());
                button.DropDownItems.Add(categoryItem);
            }
        }

        private void UpdateButtons()
        {
            btnPrint.Available = (Buttons & PreviewButtons.Print) != 0;
            btnOpen.Available = (Buttons & PreviewButtons.Open) != 0;
            btnSave.Available = (Buttons & PreviewButtons.Save) != 0;
            btnDesign.Available = (Buttons & PreviewButtons.Design) != 0;
            btnEmail.Available = (Buttons & PreviewButtons.Email) != 0 && !Config.EmailSettings.UseMAPI;
            btnFind.Available = (Buttons & PreviewButtons.Find) != 0;

            btnOutline.Available = (Buttons & PreviewButtons.Outline) != 0;
            btnPageSetup.Available = (Buttons & PreviewButtons.PageSetup) != 0;
            btnEdit.Available = (Buttons & PreviewButtons.Edit) != 0;
            btnWatermark.Available = (Buttons & PreviewButtons.Watermark) != 0;

            btnFirst.Available = (Buttons & PreviewButtons.Navigator) != 0;
            btnPrior.Available = (Buttons & PreviewButtons.Navigator) != 0;
            tbPageNo.Available = (Buttons & PreviewButtons.Navigator) != 0;
            lblTotalPages.Available = (Buttons & PreviewButtons.Navigator) != 0;
            btnNext.Available = (Buttons & PreviewButtons.Navigator) != 0;
            btnLast.Available = (Buttons & PreviewButtons.Navigator) != 0;
            btnClose.Available = (Buttons & PreviewButtons.Close) != 0;
        }

        private List<PreparedPages> GetPageOfTabs()
        {
            List<PreparedPages> list = new List<PreparedPages>();
            foreach (var tab in tabControl.Tabs)
            {
                if (tab is PreviewTab)
                    list.Add((tab as PreviewTab).PreparedPages);
            }
            return list;
        }

        private void Export_Click(object sender, EventArgs e)
        {
            if (IsPreviewEmpty)
                return;

            ObjectInfo info = (sender as ToolStripMenuItem).Tag as ObjectInfo;
            if (info == null)
                Save();
            else
            {
                ExportBase export = Activator.CreateInstance(info.Object) as ExportBase;
                export.CurPage = CurrentPreview.PageNo;
                export.AllowSaveSettings = true;
                export.ShowProgress = true;
                try
                {
                    export.Export(Report, GetPageOfTabs());
                }
#if !DEBUG
                catch (Exception ex)
                {
                    using (ExceptionForm form = new ExceptionForm(ex))
                    {
                        form.ShowDialog();
                    }
                }
#endif
                finally
                {
                }
            }
        }

        private async void Design()
        {
            if (Report == null)
                return;
            using (Report designedReport = new Report())
            {
                designedReport.FileName = Report.FileName;
                if (!String.IsNullOrEmpty(Report.FileName))
                    designedReport.Load(designedReport.FileName);
                else
                    using (MemoryStream repStream = new MemoryStream())
                    {
                        Report.Save(repStream);
                        repStream.Position = 0;
                        designedReport.Load(repStream);
                    }

                Report.Dictionary.ReRegisterData(designedReport.Dictionary);

#if AVALONIA
                if (await designedReport.DesignAsync())
#else
                if (designedReport.Design())
#endif
                {
                    Report.PreparedPages.Clear();
                    Report.PreparedPages.ClearPageCache();
                    try
                    {
                        Report.LoadFromString(designedReport.SaveToString());
                    }
                    catch (Exception ex)
                    {
                        FRMessageBox.Error(ex.Message);
                    }
                    if (CurrentPreview != null)
                    {
                        Report.Preview = CurrentPreview.Preview;
                        Report.Show();
                    }
                }
            }
        }

        private void SaveToCloud_Click(object sender, EventArgs e)
        {
            if (IsPreviewEmpty)
            {
                return;
            }

            ObjectInfo info = (sender as ToolStripMenuItem).Tag as ObjectInfo;
            if (info != null)
            {
                CloudStorageClient client = Activator.CreateInstance(info.Object) as CloudStorageClient;
                if (client is FtpStorageClient)
                {
                    XmlItem xi = Config.Root.FindItem("FtpServer").FindItem("StorageSettings");
                    string server = xi.GetProp("FtpServer");
                    string username = xi.GetProp("FtpUsername");
                    FtpStorageClientForm form = new FtpStorageClientForm(server, username, "", Report);
                    form.ShowDialog();
                }
                else if (client is DropboxStorageClient)
                {
                    XmlItem xi = Config.Root.FindItem("DropboxCloud").FindItem("StorageSettings");
                    string accessToken = xi.GetProp("AccessToken");
                    if (String.IsNullOrEmpty(accessToken))
                    {
                        ApplicationInfoForm appInfoDialog = new ApplicationInfoForm();
                        appInfoDialog.ShowDialog();
                        accessToken = appInfoDialog.AccessToken;
                    }
                    DropboxStorageClientForm form = new DropboxStorageClientForm(accessToken, Report);
                    form.ShowDialog();
                }
                else if (client is FastCloudStorageClient)
                {
                    FastCloudStorageClientSimpleForm form = new FastCloudStorageClientSimpleForm(Report);
                    form.ShowDialog();
                }
#if !AVALONIA
                else if (client is BoxStorageClient)
                {
                    XmlItem xi = Config.Root.FindItem("BoxCloud").FindItem("StorageSettings");
                    string id = xi.GetProp("ClientId");
                    string secret = xi.GetProp("ClientSecret");
                    DialogResult clientInfoDialogDialogResult = DialogResult.OK;
                    if (String.IsNullOrEmpty(id) || String.IsNullOrEmpty(secret))
                    {
                        Box.ClientInfoForm clientInfoDialog = new Box.ClientInfoForm();
                        clientInfoDialog.ShowDialog();
                        id = clientInfoDialog.Id;
                        secret = clientInfoDialog.Secret;
                        clientInfoDialogDialogResult = clientInfoDialog.DialogResult;
                    }
                    if (clientInfoDialogDialogResult == DialogResult.OK)
                    {
                        BoxStorageClientForm form = new BoxStorageClientForm(new SkyDrive.ClientInfo("", id, secret), Report);
                        form.ShowDialog();
                    }
                }
                else if (client is GoogleDriveStorageClient)
                {
                    XmlItem xi = Config.Root.FindItem("GoogleDriveCloud").FindItem("StorageSettings");
                    string id = xi.GetProp("ClientId");
                    string secret = xi.GetProp("ClientSecret");
                    if (String.IsNullOrEmpty(id) || String.IsNullOrEmpty(secret))
                    {
                        GoogleDrive.ClientInfoForm clientInfoDialog = new GoogleDrive.ClientInfoForm();
                        clientInfoDialog.ShowDialog();
                        id = clientInfoDialog.Id;
                        secret = clientInfoDialog.Secret;
                    }
                    GoogleDriveStorageClientForm form = new GoogleDriveStorageClientForm(new SkyDrive.ClientInfo("", id, secret), Report);
                    form.ShowDialog();
                }
                else if (client is SkyDriveStorageClient)
                {
                    XmlItem xi = Config.Root.FindItem("SkyDriveCloud").FindItem("StorageSettings");
                    string id = xi.GetProp("ClientId");
                    string secret = xi.GetProp("ClientSecret");
                    if (String.IsNullOrEmpty(id) || String.IsNullOrEmpty(secret))
                    {
                        SkyDrive.ClientInfoForm appInfoDialog = new SkyDrive.ClientInfoForm();
                        appInfoDialog.ShowDialog();
                        id = appInfoDialog.Id;
                        secret = appInfoDialog.Secret;
                    }
                    SkyDriveStorageClientForm form = new SkyDriveStorageClientForm(new SkyDrive.ClientInfo("", id, secret), Report);
                    form.ShowDialog();
                }
#endif
                else if (client is S3StorageClient)
                {
                    XmlItem xi = Config.Root.FindItem("S3").FindItem("StorageSettings");
                    string accessKeyId = xi.GetProp("AccessKeyId");
                    string secretAccessKey = xi.GetProp("SecretAccessKey");
                    string region = xi.GetProp("Region");
                    string host = xi.GetProp("Host");

                    Cloud.StorageClient.S3.ClientInfoForm appInfoDialog = new Cloud.StorageClient.S3.ClientInfoForm();
                    appInfoDialog.AccessKeyId = accessKeyId;
                    appInfoDialog.SecretAccessKey = secretAccessKey;
                    appInfoDialog.Region = region;
                    appInfoDialog.Host = host;
                    if (appInfoDialog.ShowDialog() == DialogResult.OK)
                    {
                        accessKeyId = appInfoDialog.AccessKeyId;
                        secretAccessKey = appInfoDialog.SecretAccessKey;
                        region = appInfoDialog.Region;
                        host = appInfoDialog.Host;
                    }
                    else
                        return;

                    S3ClientForm form = new S3ClientForm(accessKeyId, secretAccessKey, region, host, Report);
                    form.Client.AfterUpload += PreviewControl_AfterUpload;
                    form.Client.BeforeUpload += Client_BeforeUpload;
                    form.ShowDialog();
                }
            }
        }

        private void Client_BeforeUpload(object sender, EventArgs e)
        {
            ShowPerformance(Res.Get("Preview,Uploading"));
            uploadTimer.Start();
        }
        private void Timer_Tick(object sender, EventArgs e)
        {
            if (lblPerformance.Text.Contains("..."))
                lblPerformance.Text = lblPerformance.Text.Replace("...", "");
            else
                lblPerformance.Text += ".";
        }

        private void PreviewControl_AfterUpload(object sender, EventArgs e)
        {
            ShowPerformance(Res.Get("Preview,UploadDone"));
        }

        private void tabControl1_TabClosed(object sender, EventArgs e)
        {
            DeleteTab(sender as PreviewTab);
        }

        private void tabControl1_TabChanged(object sender, EventArgs e)
        {
            if (locked)
                return;
            currentPreview = tabControl.SelectedTab as PreviewTab;
            if (currentPreview != null && !currentPreview.Fake)
            {
                UpdateOutline();
                UpdateZoom(currentPreview.Zoom);
                UpdatePageNumbers(currentPreview.PageNo, currentPreview.PageCount);
            }
        }

        private void tabControl_Resize(object sender, EventArgs e)
        {
            UpdateDocumentLayout();
        }

        private bool CanDisposeTabReport(PreviewTab tab)
        {
            if (tab == null || tab.Report == null)
                return false;

            // if the preview is owned by Report, do not dispose
            if (report == tab.Report)
                return false;

            // check if the same Report is used in other tabs
            foreach (PreviewTab t in documents)
            {
                if (t != tab && t.Report == tab.Report)
                {
                    return false;
                }
            }
            return true;
        }

        private void Localize()
        {
            MyRes res = new MyRes("Preview");
            btnPrint.Text = res.Get("PrintText");
            btnPrint.ToolTipText = res.Get("Print");
            btnOpen.ToolTipText = res.Get("Open");
            btnOpen.Text = res.Get("OpenText");
            btnDesign.Text = res.Get("DesignText");
            btnDesign.ToolTipText = res.Get("Design");
            btnSave.ToolTipText = res.Get("Save");
            btnSave.Text = res.Get("SaveText");
            btnEmail.ToolTipText = res.Get("Email");
            btnFind.ToolTipText = res.Get("Find");
            btnOutline.ToolTipText = res.Get("Outline");
            btnPageSetup.ToolTipText = res.Get("PageSetup");
            btnEdit.ToolTipText = res.Get("Edit");
            btnWatermark.ToolTipText = res.Get("Watermark");
            btnFirst.ToolTipText = res.Get("First");
            btnPrior.ToolTipText = res.Get("Prior");
            btnNext.ToolTipText = res.Get("Next");
            lblTotalPages.Text = String.Format(Res.Get("Misc,ofM"), 1);
            btnLast.ToolTipText = res.Get("Last");
            btnClose.Text = Res.Get("Buttons,Close");
        }

        private void Init()
        {
            outlineControl.SetPreview(this);

            uploadTimer = new Timer();
            uploadTimer.Interval = 1500;
            uploadTimer.Tick += Timer_Tick;

            pageBorderColor = Color.FromArgb(80, 80, 80);
            activePageBorderColor = Color.FromArgb(255, 199, 60);
            pageOffset = new Point(10, 10);
            defaultZoom = 1;

            buttons = PreviewButtons.All;
            exports = Config.PreviewSettings.Exports;
            clouds = Config.PreviewSettings.Clouds;

            RestoreState();
            UpdateButtons();

            zoomControl.ZoomValue = Zoom;
        }

        public void RestoreState()
        {
            var storage = new ControlStorageService(this, "Preview");

            defaultZoom = storage.GetFloat("Zoom", 1);
            splitContainer1.SplitterDistance = storage.GetDip("OutlineWidth", 250, 50, 800);
        }

        public void SaveState()
        {
            Clear();
            outlineControl.Hide();

            var storage = new ControlStorageService(this, "Preview");
            storage.SetFloat("Zoom", Zoom);
            storage.SetDip("OutlineWidth", splitContainer1.SplitterDistance);
        }

        private void UpdateDocumentLayout()
        {
            foreach (PreviewTab tab in documents)
            {
                tab.UpdatePages();
            }
        }

        private void UpdateUIStyle()
        {
            toolStrip.Renderer = statusStrip.Renderer = UIStyleUtils.GetToolStripRenderer(UIStyle);
            zoomControl.UIStyle = UIStyle;
            var table = UIStyleUtils.GetColorTable(UIStyle);
            if (!UseBackColor)
                BackColor = table.Workspace.WorkspaceBackColor;
            tabControl.Style = table.Workspace;

            foreach (PreviewTab tab in documents)
            {
                tab.Style = UIStyle;
            }
        }

        private void UpdateOutline()
        {
            outlineControl.PreparedPages = currentPreview.PreparedPages;
            OutlineVisible = !currentPreview.PreparedPages.Outline.IsEmpty;
        }

        private void AddFakeTab()
        {
            PreviewTab tab = new PreviewTab(this, null, "", null);
            tab.Fake = true;
            documents.Add(tab);
            tab.AddToTabControl(tabControl);
        }

        private void UpdateTabsVisible()
        {
            tabControl.ShowTabs = documents.Count > 1 && !documents[0].Fake;
        }

        private PreviewTab FindTab(string text)
        {
            foreach (PreviewTab tab in documents)
            {
                if (tab.Text == text)
                    return tab;
            }

            return null;
        }

        private PreviewTab FindTabByHyperlinkValue(string value)
        {
            foreach (PreviewTab tab in documents)
            {
                if (tab.HyperlinkValue == value)
                    return tab;
            }

            return null;
        }
#endregion

        #region Public Methods
        internal void SetReport(Report report)
        {
            this.report = report;
        }

        internal void UpdatePageNumbers(int pageNo, int totalPages)
        {
            lblStatus.Text = String.Format(Res.Get("Misc,PageNofM"), pageNo, totalPages);
            tbPageNo.Text = pageNo.ToString();
            lblTotalPages.Text = String.Format(Res.Get("Misc,ofM"), totalPages);
            if (PageChanged != null)
                PageChanged(this, EventArgs.Empty);
        }

        internal void UpdateZoom(float zoom)
        {
            updatingZoom = true;
            zoomControl.ZoomValue = zoom;
            updatingZoom = false;
        }

        internal void UpdateUrl(string url)
        {
            lblUrl.Text = url;
        }

        internal void ShowPerformance(string text)
        {
            uploadTimer.Stop();
            lblPerformance.Text = text;
        }

        internal void DoClick()
        {
            OnClick(EventArgs.Empty);
        }

        // Clears all tabs except the first one. This method is used in the report.Prepare.
        // It is needed to avoid flickering when using stand-alone PreviewControl. 
        // When report is prepared and ShowPrepared method is called, the "fake" tab will
        // be replaced with the new tab.
        internal void ClearTabsExceptFirst()
        {
            while (documents.Count > 1)
            {
                DeleteTab(documents[documents.Count - 1]);
            }
            if (documents.Count == 1)
                documents[0].Fake = true;
        }

        internal PreviewTab AddPreviewTab(Report report, string text, Hyperlink hyperlink, bool setActive)
        {
            PreviewTab tab = new PreviewTab(this, report, text, hyperlink);
            documents.Add(tab);
            if (documents.Count == 2 && documents[0].Fake)
                DeleteTab(documents[0]);

            var rescale = tabControl.Dpi() / (float)tab.Dpi();
            tab.AddToTabControl(tabControl);
            tab.Scale(new SizeF(rescale, rescale));
            tab.UnlockLayout();
            UpdateTabsVisible();
            tab.UpdatePages();

            if (setActive)
                tabControl.SelectedTab = tab;
            else
                tabControl.Refresh();

            return tab;
        }

        /// <summary>
        /// Adds a new report tab to the preview control.
        /// </summary>
        /// <param name="report">The <b>Report</b> object that contains the prepared report.</param>
        /// <param name="text">The title for the new tab.</param>
        /// <remarks>
        /// Prepare the report using its <b>Prepare</b> method before you pass it to the <b>report</b> parameter.
        /// </remarks>
        public void AddTab(Report report, string text)
        {
            if (this.report == null)
                SetReport(report);
            AddPreviewTab(report, text, null, true);
        }

        /// <summary>
        /// Switches to the tab with specified text.
        /// </summary>
        /// <param name="text">Text of the tab.</param>
        /// <returns><b>true</b> if the tab with specified text exists, or <b>false</b> if there is no such tab.</returns>
        public bool SwitchToTab(string text)
        {
            PreviewTab tab = FindTab(text);
            if (tab != null)
            {
                tabControl.SelectedTab = tab;
                return true;
            }

            return false;
        }

        internal bool SwitchToTab(Hyperlink hyperlink)
        {
            PreviewTab tab = FindTabByHyperlinkValue(hyperlink.Value);
            if (tab != null)
            {
                tabControl.SelectedTab = tab;
                return true;
            }

            return false;
        }

        /// <summary>
        /// Deletes the report tab with specified text.
        /// </summary>
        /// <param name="text">The text of the tab.</param>
        public void DeleteTab(string text)
        {
            PreviewTab tab = FindTab(text);
            if (tab != null)
                DeleteTab(tab);
        }

        /// <summary>
        /// Checks if the tab with specified text exists.
        /// </summary>
        /// <param name="text">The text of the tab.</param>
        /// <returns><b>true</b> if the tab exists.</returns>
        public bool TabExists(string text)
        {
            return FindTab(text) != null;
        }

        internal void DeleteTab(PreviewTab tab)
        {
            if (CanDisposeTabReport(tab))
                tab.Report.Dispose();
            documents.Remove(tab);
            tabControl.Tabs.Remove(tab);
            tab.Dispose();
            uploadTimer.Dispose();
            UpdateTabsVisible();
        }

        /// <summary>
        /// Displays the text in the status bar.
        /// </summary>
        /// <param name="text">Text to display.</param>
        public void ShowStatus(string text)
        {
            int tick = Environment.TickCount;
            if (tick - lastTick < 50 && !string.IsNullOrEmpty(text))
                return;
            lastTick = tick;
            lblStatus.Text = text;
            statusStrip.Refresh();
            Application.DoEvents();
        }

        internal void Lock()
        {
            locked = true;
        }

        internal void Unlock()
        {
            locked = false;
        }

        /// <summary>
        /// Sets the focus to the preview control.
        /// </summary>
        public new void Focus()
        {
            if (currentPreview != null)
                currentPreview.Focus();
        }

        /// <summary>
        /// Updates the control appearance and layout on dpi change.
        /// </summary>
        public void UpdateDpiDependencies()
        {
            Font = this.LogicalToDevice(DrawUtils.DefaultFont);
            tabControl.Font = Font;
            toolStrip.Font = Font;
            statusStrip.Font = Font;
            tbPageNo.Font = Font;
            outlineControl.Font = Font;
            outlineControl.UpdateDpiDependencies();
            toolStrip.Height = this.LogicalToDevice(26);
            statusStrip.Height = this.LogicalToDevice(26);
            statusStrip.Padding = new Padding(6, 0, 0, 0);
            tabControl.UpdateDpiDependencies();

            btnPrint.Image = this.GetImage(195);
            btnOpen.Image = this.GetImage(1);
            btnSave.Image = this.GetImage(2);
            btnDesign.Image = this.GetImage(68);
            btnEmail.Image = this.GetImage(200);
            btnFind.Image = this.GetImage(181);
            btnOutline.Image = this.GetImage(196);
            btnPageSetup.Image = this.GetImage(13);
            btnEdit.Image = this.GetImage(198);
            btnWatermark.Image = this.GetImage(194);
            btnFirst.Image = this.GetImage(185);
            btnPrior.Image = this.GetImage(186);
            btnNext.Image = this.GetImage(187);
            btnLast.Image = this.GetImage(188);

            tbPageNo.Size = this.LogicalToDevice(new Size(40, 21));
            lblStatus.Size = this.LogicalToDevice(new Size(280, 21));
            zoomControl.Size = this.LogicalToDevice(new Size(280, 26));

            CreateOpenList();
            CreateSaveList();
            UpdateDocumentLayout();
        }

        #endregion

        #region Async Prepare
        /// <summary>
        /// Gets the value indicating that async report is running.
        /// </summary>
        /// <remarks>
        /// This value can be used to abort the report when you close the form that contains the report preview control.
        /// </remarks>
        public bool IsAsyncReportRunning { get; private set; }

        // we have to call this separately before AsyncReportStart to set this flag (case: clicking reports in the reports list too fast leads to NRE)
        internal void SetAsyncReportRunning() => IsAsyncReportRunning = true;

        internal void AsyncReportStart()
        {
            Report.PreparedPages.PageAdded += AsyncReportPageAdded;
            // update buttons
            btnClose.Text = Res.Get("Buttons,Cancel");
            EnableButtons(false);
            lblStatus.Text = "";
            uploadTimer.Stop();
            lblPerformance.Text = "";
            tbPageNo.Text = "0";
        }

        private int lastTick;

        private void AsyncReportPageAdded(object sender, EventArgs e)
        {
            int tick = Environment.TickCount;
            if (tick - lastTick < 50 && Report.PreparedPages.Count > 100)
                return;
            Application.DoEvents();
            if (Report.Engine.FinalPass)
            {
                OutlineVisible = !Report.PreparedPages.Outline.IsEmpty;
                CurrentPreview.UpdatePages();
            }
            lastTick = Environment.TickCount;
        }

        internal void AsyncReportFinish()
        {
            IsAsyncReportRunning = false;
            Report.PreparedPages.PageAdded -= AsyncReportPageAdded;
            Report.PreparedPages.ClearPageCache();
            UpdateOutline();
            CurrentPreview.UpdatePages();
            // update buttons
            btnClose.Text = Res.Get("Buttons,Close");
            EnableButtons(true);
        }

        private void EnableButtons(bool enable)
        {
            foreach (ToolStripItem button in ToolBar.Items)
            {
                if (button == btnFirst)
                    break;
                button.Enabled = enable;
            }
        }

        #endregion

        #region Event handlers

        private void btnDesign_Click(object sender, EventArgs e)
        {
            Design();
        }
        private void btnPrint_Click(object sender, EventArgs e)
        {
            Print();
        }

        private void btnOpenLocal_Click(object sender, EventArgs e)
        {
            Load();
        }

        private void btnOpenViaCloud_Click(object sender, EventArgs e)
        {
            var stream = CloudCommands.LoadPreviewFile();
            if (stream != null)
                Load(stream);
        }

        private void btnSaveLocal_Click(object sender, EventArgs e)
        {
            Save();
        }

        private void btnSaveToCloud_Click(object sender, EventArgs e)
        {
            CloudCommands.SavePreviewFile(currentPreview.Report);
        }

        private void btnEmail_Click(object sender, EventArgs e)
        {
            SendEmail();
        }

        private void btnFind_Click(object sender, EventArgs e)
        {
            Find();
        }

        private void btnZoom100_Click(object sender, EventArgs e)
        {
            Zoom = 1;
        }

        private void btnZoomWholePage_Click(object sender, EventArgs e)
        {
            ZoomWholePage();
        }

        private void btnZoomPageWidth_Click(object sender, EventArgs e)
        {
            ZoomPageWidth();
        }

        private void slider_ValueChanged(object sender, EventArgs e)
        {
            if (updatingZoom || CurrentPreview == null)
                return;

            Zoom = zoomControl.ZoomValue;
            CurrentPreview.Focus();
        }

        private void btnEdit_Click(object sender, EventArgs e)
        {
            EditPage();
        }

        private void btnFirst_Click(object sender, EventArgs e)
        {
            First();
        }

        private void btnPrior_Click(object sender, EventArgs e)
        {
            Prior();
        }

        private void btnNext_Click(object sender, EventArgs e)
        {
            Next();
        }

        private void btnLast_Click(object sender, EventArgs e)
        {
            Last();
        }

        private void cbxPageNo_KeyDown(object sender, KeyEventArgs e)
        {
            if (e.KeyCode == Keys.Enter)
            {
                try
                {
                    PageNo = int.Parse(tbPageNo.Text);
                }
                catch
                {
                    PageNo = PageCount;
                }
                CurrentPreview.Focus();
            }
        }

        private void tbPageNo_KeyPress(object sender, KeyPressEventArgs e)
        {
            if (e.KeyChar != '\b' && (e.KeyChar < '0' || e.KeyChar > '9'))
                e.Handled = true;
        }

        private void btnWatermark_Click(object sender, EventArgs e)
        {
            EditWatermark();
        }

        private void btnOutline_Click(object sender, EventArgs e)
        {
            OutlineVisible = btnOutline.Checked;
        }

        private void btnPageSetup_Click(object sender, EventArgs e)
        {
            PageSetup();
        }

        private void btnClose_Click(object sender, EventArgs e)
        {
            if (IsAsyncReportRunning)
            {
                Report.Abort();
                return;
            }

#if WPF
            System.Windows.Window.GetWindow(control)?.Close();
#elif AVALONIA
            (Avalonia.Controls.TopLevel.GetTopLevel(control) as Avalonia.Controls.Window)?.Close();
#else
            if (FindForm() != null)
                FindForm().Close();
#endif
        }

#endregion

        #region Preview commands
        /// <summary>
        /// Prints the current report.
        /// </summary>
        /// <returns><b>true</b> if report was printed; <b>false</b> if user cancels the "Print" dialog.</returns>
        public bool Print()
        {
            if (CurrentPreview == null)
                return false;
            return CurrentPreview.Print();
        }

        /// <summary>
        /// Saves the current report to a .fpx file using the "Save FIle" dialog.
        /// </summary>
        public void Save()
        {
            if (CurrentPreview == null)
                return;
            CurrentPreview.Save();
        }

        /// <summary>
        /// Saves the current report to a specified .fpx file.
        /// </summary>
        public void Save(string fileName)
        {
            if (CurrentPreview == null)
                return;
            CurrentPreview.Save(fileName);
        }

        /// <summary>
        /// Saves the current report to a stream.
        /// </summary>
        public void Save(Stream stream)
        {
            if (CurrentPreview == null)
                return;
            CurrentPreview.Save(stream);
        }

        private bool PreLoad()
        {
            if (CurrentPreview == null)
                return false;
            if (documents.Count == 1 && documents[0].Fake)
            {
                Report report = new Report();
                report.SetPreparedPages(new PreparedPages(report));
                AddTab(report, "");
            }
            return true;
        }

        private void PostLoad()
        {
            UpdateOutline();
        }

        /// <summary>
        /// Loads the report from a .fpx file using the "Open File" dialog.
        /// </summary>
        public new void Load()
        {
            if (CurrentPreview == null)
                return;
            CurrentPreview.Load();
            UpdateOutline();
        }

        /// <summary>
        /// Loads the report from a specified .fpx file.
        /// </summary>
        public new void Load(string fileName)
        {
            if (CurrentPreview == null)
                return;
            CurrentPreview.Load(fileName);
            UpdateOutline();
        }

        /// <summary>
        /// Load the report from a stream.
        /// </summary>
        /// <param name="stream">The stream to load from.</param>
        public new void Load(Stream stream)
        {
            if (CurrentPreview == null)
                return;
            CurrentPreview.Load(stream);
            UpdateOutline();
        }

        /// <summary>
        /// Sends an email.
        /// </summary>
        public void SendEmail()
        {
            if (CurrentPreview == null)
                return;
            CurrentPreview.SendEmail();
        }

        /// <summary>
        /// Finds the text in the current report using the "Find Text" dialog.
        /// </summary>
        public void Find()
        {
            if (CurrentPreview == null)
                return;
            CurrentPreview.Find();
        }

        /// <summary>
        /// Finds the specified text in the current report.
        /// </summary>
        /// <param name="text">Text to find.</param>
        /// <param name="matchCase">A value indicating whether the search is case-sensitive.</param>
        /// <param name="wholeWord">A value indicating whether the search matches whole words only.</param>
        /// <returns><b>true</b> if text found.</returns>
        public bool Find(string text, bool matchCase, bool wholeWord)
        {
            if (CurrentPreview == null)
                return false;
            return CurrentPreview.Find(text, matchCase, wholeWord);
        }

        /// <summary>
        /// Finds the next occurence of text specified in the <b>Find</b> method.
        /// </summary>
        /// <returns><b>true</b> if text found.</returns>
        public bool FindNext()
        {
            if (CurrentPreview == null)
                return false;
            return CurrentPreview.FindNext();
        }

        /// <summary>
        /// Navigates to the first page.
        /// </summary>
        public void First()
        {
            if (CurrentPreview == null)
                return;
            CurrentPreview.First();
        }

        /// <summary>
        /// Navigates to the previuos page.
        /// </summary>
        public void Prior()
        {
            if (CurrentPreview == null)
                return;
            CurrentPreview.Prior();
        }

        /// <summary>
        /// Navigates to the next page.
        /// </summary>
        public void Next()
        {
            if (CurrentPreview == null)
                return;
            CurrentPreview.Next();
        }

        /// <summary>
        /// Navigates to the last page.
        /// </summary>
        public void Last()
        {
            if (CurrentPreview == null)
                return;
            CurrentPreview.Last();
        }

        /// <summary>
        /// Gets or sets the current page number.
        /// </summary>
        /// <remarks>
        /// This value is 1-based.
        /// </remarks>
        [Browsable(false)]
        [DesignerSerializationVisibility(DesignerSerializationVisibility.Hidden)]
        public int PageNo
        {
            get
            {
                if (CurrentPreview == null)
                    return 1;
                return CurrentPreview.PageNo;
            }
            set
            {
                if (CurrentPreview == null)
                    return;
                CurrentPreview.PageNo = value;
            }
        }

        /// <summary>
        /// Gets the pages count in the current report.
        /// </summary>
        [Browsable(false)]
        [DesignerSerializationVisibility(DesignerSerializationVisibility.Hidden)]
        public int PageCount
        {
            get
            {
                if (CurrentPreview == null)
                    return 0;
                return CurrentPreview.PageCount;
            }
        }

        /// <summary>
        /// Gets or sets the zoom factor.
        /// </summary>
        /// <remarks>
        /// <b>1</b> corresponds to 100% zoom.
        /// </remarks>
        [Browsable(false)]
        [DesignerSerializationVisibility(DesignerSerializationVisibility.Hidden)]
        public float Zoom
        {
            get
            {
                if (CurrentPreview == null)
                    return 1;
                return CurrentPreview.Zoom;
            }
            set
            {
                if (CurrentPreview != null)
                {
                    CurrentPreview.Zoom = value;
                    updatingZoom = true;
                    zoomControl.ZoomValue = value;
                    updatingZoom = false;
                }
            }
        }

        /// <summary>
        /// Zooms in.
        /// </summary>
        public void ZoomIn()
        {
            if (CurrentPreview == null)
                return;
            CurrentPreview.ZoomIn();
        }

        /// <summary>
        /// Zooms out.
        /// </summary>
        public void ZoomOut()
        {
            if (CurrentPreview == null)
                return;
            CurrentPreview.ZoomOut();
        }

        /// <summary>
        /// Zooms to fit the page width.
        /// </summary>
        public void ZoomPageWidth()
        {
            if (CurrentPreview == null)
                return;
            CurrentPreview.ZoomPageWidth();
        }

        /// <summary>
        /// Zooms to fit the whole page.
        /// </summary>
        public void ZoomWholePage()
        {
            if (CurrentPreview == null)
                return;
            CurrentPreview.ZoomWholePage();
        }

        /// <summary>
        /// Edits the current page in the designer.
        /// </summary>
        public void EditPage()
        {
            if (CurrentPreview == null)
                return;
            CurrentPreview.EditPage();
        }

        /// <summary>
        /// Edits the watermark.
        /// </summary>
        public void EditWatermark()
        {
            if (CurrentPreview == null)
                return;
            CurrentPreview.EditWatermark();
        }

        /// <summary>
        /// Edits the page settings.
        /// </summary>
        public void PageSetup()
        {
            if (CurrentPreview == null)
                return;
            CurrentPreview.PageSetup();
        }

        /// <summary>
        /// Navigates to the specified position inside a specified page.
        /// </summary>
        /// <param name="pageNo">The page number (1-based).</param>
        /// <param name="point">The position inside a page, in pixels.</param>
        public void PositionTo(int pageNo, PointF point)
        {
            if (CurrentPreview == null)
                return;
            CurrentPreview.PositionTo(pageNo, point);
        }

        /// <summary>
        /// Clears the preview.
        /// </summary>
        public void Clear()
        {
            while (documents.Count > 0)
            {
                DeleteTab(documents[0]);
            }

            lblStatus.Text = "";
            tbPageNo.Text = "";
        }

        /// <summary>
        /// Refresh the report.
        /// </summary>
        public void RefreshReport()
        {
            if (CurrentPreview == null)
                return;
            CurrentPreview.RefreshReport();
        }
        #endregion

        /// <summary>
        /// Initializes a new instance of the <see cref="PreviewControl"/> class.
        /// </summary>
        public PreviewControl()
        {
            // we need this to ensure that static constructor of the Report was called.
            Report report = new Report();
            report.Dispose();

            documents = new List<PreviewTab>();
            InitializeComponent();

            tabControl = new FRTabControl();
            tabControl.Parent = splitContainer1.Panel2;
            tabControl.ShowCaption = false;
            tabControl.TabOrientation = TabOrientation.Top;
            tabControl.Dock = DockStyle.Fill;
            tabControl.Name = "tabControl";
            tabControl.Resize += tabControl_Resize;
            tabControl.SelectedTabChanged += tabControl1_TabChanged;
            tabControl.TabClosed += tabControl1_TabClosed;

            zoomControl = new ToolStripZoomControl();
            zoomControl.ZoomPageWidthClick += btnZoomPageWidth_Click;
            zoomControl.ZoomWholePageClick += btnZoomWholePage_Click;
            zoomControl.Zoom100Click += btnZoom100_Click;
            zoomControl.ValueChanged += slider_ValueChanged;

            statusStrip.Items.Add(zoomControl);

#if (WPF || AVALONIA)
            toolStrip.BorderThickness = new Padding(0);
            var shadow = toolStrip.SetShadow(DockStyle.Bottom);
            UIStyleChanged += (s, e) => shadow.Color = UIStyleUtils.GetColorTable(UIStyle).ToolStripBorder;
#endif

            toolbarVisible = true;
            statusbarVisible = true;
            OutlineVisible = false;
            UIStyle = Config.UIStyle;
            Localize();
            Init();
            AddFakeTab();
            UpdateDpiDependencies();
        }
    }
}