Imports System.Windows.Threading

Public Class PageLaunchRight
    Implements IRefreshable, IDispatcherUnhandledException

    Private Sub Init() Handles Me.Loaded
        PanBack.ScrollToHome()
        CommunismWelcome.Visibility = If(ThemeNow = DefaultTheme, Visibility.Visible, Visibility.Collapsed)
        PanLog.Visibility = ModeDebug.ToVisibility
        '快照版提示
        PanHint.Visibility =
            (BuildType <> BuildTypes.Release AndAlso VersionBranchMain = "Official" AndAlso
             CurrentRank < DonationRank.Rank23 AndAlso Not Settings.Get(Of Boolean)("HintSnapshot")).ToVisibility
    End Sub

    Private Sub BtnRedDownload_Click(sender As Object, e As EventArgs) Handles BtnRedDownload.Click
        FrmMain.PageChange(FormMain.PageType.Download)
    End Sub
    Private Sub BtnRedThemes_Click(sender As Object, e As EventArgs) Handles BtnRedThemes.Click
        FrmMain.PageChange(FormMain.PageType.Setup, FormMain.PageSubType.SetupUI)
    End Sub

#Region "主页"

    ''' <summary>
    ''' 刷新主页。
    ''' </summary>
    Private Sub Refresh() Handles Me.Loaded
        RunInThread(
        Sub()
            Try
                SyncLock RefreshLock
                    RefreshReal()
                End SyncLock
            Catch ex As Exception
                Logger.Error(ex, "加载 PCL 主页自定义信息失败", If(ModeDebug, LogBehavior.Alert, LogBehavior.Toast))
            End Try
        End Sub)
    End Sub
    Private Sub RefreshReal()
        Dim Content As String = Nothing
        If Settings.Get(Of Integer)("UiCustomType") = 1 Then
            Content = FileUtils.TryReadAsString(Paths.Base & "PCL\Custom.xaml")
        ElseIf Settings.Get(Of Integer)("UiCustomType") = 3 Then
            Content = "<local:MyCard Title=""你知道吗？"" Margin=""0,0,0,15""><TextBlock Margin=""25,38,23,15"" Text=""{hint}"" TextWrapping=""Wrap"" /></local:MyCard>"
        End If
        RunInUi(Sub() LoadContent(Content))
    End Sub
    Private RefreshLock As New Object

    Public Sub ForceRefresh() Implements IRefreshable.Refresh
        Logger.Info("要求强制刷新主页")
        ClearCache()
        '实际的刷新
        If FrmMain.PageCurrent.Page = FormMain.PageType.Launch Then
            PanBack.ScrollToHome()
            Refresh()
        Else
            FrmMain.PageChange(FormMain.PageType.Launch)
        End If
    End Sub

    ''' <summary>
    ''' 清空主页缓存信息。
    ''' </summary>
    Private Sub ClearCache()
        LoadedContentHash = Nothing
        Settings.Set("CacheSavedPageUrl", "")
        Settings.Set("CacheSavedPageVersion", "")
        Logger.Info("已清空主页缓存")
    End Sub

    ''' <summary>
    ''' 从文本内容中加载主页。
    ''' 必须在 UI 线程调用。
    ''' </summary>
    Private Sub LoadContent(Content As String)
        Try
            SyncLock LoadContentLock
                '如果加载目标内容一致则不加载
                Dim Hash = If(Content, "").GetStableHashCode()
                If Hash = LoadedContentHash Then Return
                LoadedContentHash = Hash
                '实际加载内容
                PanCustom.Children.Clear()
                If String.IsNullOrWhiteSpace(Content) Then
                    Logger.Info($"实例化：清空主页 UI，来源为空")
                    Return
                End If
                Dim LoadStartTime As Date = Date.Now
                '修改时应同时修改 PageOtherHelpDetail.Init
                Content = ArgumentReplace(Content, AddressOf StringUtils.XmlEscape)
                Do While Content.Contains("xmlns")
                    Content = Content.RegexReplace("xmlns[^""']*(""|')[^""']*(""|')", "").Replace("xmlns", "") '禁止声明命名空间
                Loop
                Content = "<StackPanel xmlns=""http://schemas.microsoft.com/winfx/2006/xaml/presentation"" xmlns:sys=""clr-namespace:System;assembly=mscorlib"" xmlns:x=""http://schemas.microsoft.com/winfx/2006/xaml"" xmlns:local=""clr-namespace:PCL;assembly=Plain Craft Launcher 2"" xmlns:core=""clr-namespace:MeloongCore;assembly=MeloongCore"" xmlns:corewpf=""clr-namespace:MeloongCore.Wpf;assembly=MeloongCore.Wpf"">" & Content & "</StackPanel>"
                Logger.Info($"实例化：加载主页 UI 开始，最终内容长度：{Content.Count}")
                PanCustom.Children.Add(GetObjectFromXML(Content))
                '加载计时
                Dim LoadCostTime = (Date.Now - LoadStartTime).Milliseconds
                Logger.Info($"实例化：加载主页 UI 完成，耗时 {LoadCostTime}ms")
                If LoadCostTime > 3000 Then Hint($"主页加载过于缓慢（花费了 {Math.Round(LoadCostTime / 1000, 1)} 秒），请向主页作者反馈此问题，或暂时停止使用该主页")
            End SyncLock
        Catch ex As Exception
            Logger.Warn(ex, $"加载失败的主页内容：{vbCrLf}{Content}")
            OnLoadContentFailed(ex)
        End Try
    End Sub
    ''' <summary>
    ''' 加载主页失败时调用。
    ''' </summary>
    Private Sub OnLoadContentFailed(ex As Exception)
        If ModeDebug OrElse Settings.Get(Of Integer)("UiCustomType") = 1 Then
            Logger.Warn(ex, "加载主页失败")
            If MyMsgBox(If(TypeOf ex Is UnauthorizedAccessException, ex.Message, $"主页内容编写有误，请根据下列错误信息进行检查：{vbCrLf}{ex.GetDisplay(False)}"),
                        "加载主页失败", "重试", "取消") = 1 Then ForceRefresh()
        Else
            Logger.Error(ex, "加载主页失败", LogBehavior.Toast)
        End If
    End Sub
    ''' <summary>
    ''' 捕获主页在 Measure 和 Arrange 阶段抛出的异常。
    ''' </summary>
    Private Sub DispatcherUnhandledException(sender As Object, e As DispatcherUnhandledExceptionEventArgs) Implements IDispatcherUnhandledException.DispatcherUnhandledException
        If TypeOf e.Exception IsNot Markup.XamlParseException Then Return
        e.Handled = True
        LoadContent(Nothing)
        OnLoadContentFailed(e.Exception)
    End Sub

    Private LoadedContentHash As ULong? = Nothing
    Private LoadContentLock As New Object

#End Region

End Class