Imports System.ComponentModel
Imports System.Runtime.Remoting.Messaging
Imports System.Threading.Tasks
Imports Connectors.Common
Imports DevExpress.XtraEditors.ViewInfo
Imports DigitalData.Modules.Config
Imports DigitalData.Modules.Database
Imports DigitalData.Modules.Logging

Partial Public Class frmMain
    Private LogConfig As LogConfig
    Private Logger As Logger
    Private ConfigManager As ConfigManager(Of Config)
    Private Database As MSSQLServer
    Private Sync As ISync

    Private FilesProcessed As Integer = 0
    Private ErrorsOccurred As Integer = 0
    Private SyncRunning As Boolean = False

    Public Enum LogLevel
        Info
        Warning
        [Error]
    End Enum

    Private Class LogLine
        Public Message As String
        Public Level As LogLevel
        Public CreatedWhen As Date = Now

        Public Overrides Function ToString() As String
            Return $"{CreatedWhen.ToShortDateString} {CreatedWhen.ToShortTimeString} {Message}"
        End Function
    End Class

    Public Sub New()
        InitializeComponent()
    End Sub

    Private Async Sub frmMain_Load(sender As Object, e As EventArgs) Handles Me.Load
        Try
            LogConfig = New LogConfig(LogConfig.PathType.CustomPath, IO.Path.Combine(Application.StartupPath, "Log"))
            ConfigManager = New ConfigManager(Of Config)(LogConfig, Application.StartupPath)
            LogConfig.Debug = ConfigManager.Config.Debug
            Logger = LogConfig.GetLogger()

            AddInfoEntry("Application started.")
            AddInfoEntry("Version: {0}", Application.ProductVersion)
            AddDivider()

            If ConfigManager.Config.ActiveModule = "NONE" Then
                AddWarnEntry("No ActiveModule selected, check your configuration!")
                Exit Sub
            End If

            Database = New MSSQLServer(LogConfig, ConfigManager.Config.ConnectionString)
            Sync = InitializeModule(ConfigManager.Config.ActiveModule)

            If Sync Is Nothing Then
                AddWarnEntry("ActiveModule '{0}' is not implemented!", ConfigManager.Config.ActiveModule)
                Exit Sub
            End If

            ' Load Form Title from Module
            Text = Sync.Name
            TrayIcon.Text = Sync.Name

            If Database.DBInitialized = False Then
                AddWarnEntry("Database could not be initialized. Please check connection string.")
                Exit Sub
            End If

            If Sync.TestConfigIsComplete() = False Then
                AddWarnEntry("Configuration is incomplete, check your configuration!")
                Exit Sub
            End If

            btnForceSync.Enabled = True

            If ConfigManager.Config.Autostart Then
                btnForceSync.Enabled = False
                Await RunSync()
                btnForceSync.Enabled = True
            End If

            If ConfigManager.Config.TimerIntervalMin > 0 Then
                AddInfoEntry("Timer Interval: {0} min", ConfigManager.Config.TimerIntervalMin.ToString)
                SyncTimer.Interval = ConfigManager.Config.TimerIntervalMin * 60 * 1_000
                StartTimer()
            Else
                AddInfoEntry("Timer Interval: Off", ConfigManager.Config.TimerIntervalMin.ToString)
            End If

        Catch ex As Exception
            Logger.Error(ex)
            AddErrorEntry($"Error while loading the application: {ex.Message}")
        End Try
    End Sub

    Private Function InitializeModule(pActiveModule As String) As ISync
        Dim oSync As ISync

        Select Case pActiveModule
            Case "slt"
                oSync = New slt.sltSync(LogConfig, Database, ConfigManager.Config)

            Case "Sharepoint"
                oSync = New Sharepoint.SharepointSync(LogConfig, Database, ConfigManager.Config)

            Case Else
                Return Nothing

        End Select

        AddHandler oSync.OnLogEntry, AddressOf Sync_OnLogEntry
        AddHandler oSync.OnFileError, AddressOf Sync_OnFileError
        AddHandler oSync.OnFileProcessed, AddressOf Sync_OnFileProcessed

        Return oSync
    End Function

    Private Sub Sync_OnFileProcessed(sender As Object, e As String)
        FilesProcessed += 1
        txtFilesProcessed.Caption = String.Format("{0} Dateien", FilesProcessed)
    End Sub

    Private Sub Sync_OnFileError(sender As Object, e As String)
        ErrorsOccurred += 1
        txtErrorsOccurred.Caption = String.Format("{0} Fehler", ErrorsOccurred)
    End Sub

    Private Sub Sync_OnLogEntry(sender As Object, e As Tuple(Of String, BaseModule.LogLevel))
        Select Case e.Item2
            Case BaseModule.LogLevel.Info
                AddInfoEntry(e.Item1)
            Case BaseModule.LogLevel.Warn
                AddWarnEntry(e.Item1)
            Case BaseModule.LogLevel.Error
                AddErrorEntry(e.Item1)
        End Select
    End Sub

    Private Async Function frmMain_Closing(sender As Object, e As CancelEventArgs) As Threading.Tasks.Task Handles Me.Closing
        Try
            If Sync IsNot Nothing AndAlso Sync.IsLoggedIn Then
                AddInfoEntry("Logging out..")
                Await Sync.Cleanup()
            End If
        Catch ex As Exception
            Logger.Error(ex)
            AddWarnEntry($"Error while closing the application: {ex.Message}")
        End Try
    End Function

    Private Sub StartTimer()
        AddInfoEntry("Starting timer..")
        btnStopSync.Enabled = True
        btnSyncStart.Enabled = False
        SyncTimer.Enabled = True
    End Sub

    Private Sub StopTimer()
        AddInfoEntry("Stopping timer..")
        btnStopSync.Enabled = False
        btnSyncStart.Enabled = True
        SyncTimer.Enabled = False
    End Sub

    Private Async Function RunSync() As Task
        If SyncRunning = True Then
            Logger.Debug("Sync still running. Skipping.")
            Exit Function
        End If

        Try
            SyncRunning = True
            Await Sync.Run()
            SyncRunning = False
        Catch ex As Exception
            SyncRunning = False
            Logger.Warn("Error while running sync!")
            Logger.Error(ex)
        End Try
    End Function

    Private Async Function Timer_Elapsed(sender As Object, e As System.EventArgs) As Threading.Tasks.Task Handles SyncTimer.Tick
        btnForceSync.Enabled = False
        Await RunSync()
        btnForceSync.Enabled = True
    End Function

    Private Sub AddInfoEntry(pMessage As String, ParamArray pArgs As Object())
        Logger.Info(pMessage, pArgs)

        Dim oItem = New LogLine With {
            .Message = String.Format(pMessage, pArgs),
            .Level = LogLevel.Info
        }

        ListBoxControl1.Items.Add(oItem)
        ListBoxControl1.MakeItemVisible(ListBoxControl1.Items.Count - 1)
    End Sub

    Private Sub AddWarnEntry(pMessage As String, ParamArray pArgs As Object())
        Logger.Info(pMessage, pArgs)

        Dim oItem = New LogLine With {
            .Message = String.Format(pMessage, pArgs),
            .Level = LogLevel.Warning
        }

        ListBoxControl1.Items.Add(oItem)
    End Sub

    Private Sub AddErrorEntry(pMessage As String, ParamArray pArgs As Object())
        Logger.Info(pMessage, pArgs)

        Dim oItem = New LogLine With {
            .Message = String.Format(pMessage, pArgs),
            .Level = LogLevel.Error
        }

        ListBoxControl1.Items.Add(oItem)
    End Sub

    Private Sub AddDivider()
        ListBoxControl1.Items.Add(New LogLine With {
            .Message = "-------------------------------------",
            .Level = LogLevel.Info
        })
    End Sub

    Private Sub btnOpenLog_ItemClick(sender As Object, e As DevExpress.XtraBars.ItemClickEventArgs) Handles btnOpenLog.ItemClick
        Try
            Dim oPath = LogConfig.LogDirectory
            Process.Start("explorer.exe", oPath)
        Catch ex As Exception
            Logger.Error(ex)
        End Try
    End Sub

    Private Sub btnSyncStart_ItemClick(sender As Object, e As DevExpress.XtraBars.ItemClickEventArgs) Handles btnSyncStart.ItemClick
        StartTimer()
    End Sub

    Private Sub btnStopSync_ItemClick(sender As Object, e As DevExpress.XtraBars.ItemClickEventArgs) Handles btnStopSync.ItemClick
        StopTimer()
    End Sub

    Private Sub btnToggleWindow_Click(sender As Object, e As EventArgs) Handles btnToggleWindow.Click
        ToggleWindow()
    End Sub

    Private Sub btnExit_Click(sender As Object, e As EventArgs) Handles btnExit.Click
        Close()
    End Sub

    Private Sub TrayIcon_MouseDoubleClick(sender As Object, e As MouseEventArgs) Handles TrayIcon.MouseDoubleClick
        ToggleWindow()
    End Sub

    Private Sub ToggleWindow()
        If Visible = True Then
            Hide()
        Else
            WindowState = FormWindowState.Minimized
            Show()
            WindowState = FormWindowState.Normal
        End If
    End Sub

    Private Async Sub btnForceSync_ItemClick(sender As Object, e As DevExpress.XtraBars.ItemClickEventArgs) Handles btnForceSync.ItemClick
        btnForceSync.Enabled = False
        Await RunSync()
        btnForceSync.Enabled = True
    End Sub

    Private Sub ListBoxControl1_DrawItem(sender As Object, e As DevExpress.XtraEditors.ListBoxDrawItemEventArgs) Handles ListBoxControl1.DrawItem
        Dim oItem As LogLine = DirectCast(e.Item, LogLine)

        Select Case oItem.Level
            Case LogLevel.Warning
                e.Appearance.ForeColor = Color.DarkOrange
                e.Appearance.FontStyleDelta = FontStyle.Bold
            Case LogLevel.Error
                e.Appearance.ForeColor = Color.DarkRed
                e.Appearance.FontStyleDelta = FontStyle.Bold
        End Select
    End Sub

    Private Sub btnOpenConfig_ItemClick(sender As Object, e As DevExpress.XtraBars.ItemClickEventArgs) Handles btnOpenConfig.ItemClick
        Try
            Dim oPath = Application.StartupPath
            Process.Start("explorer.exe", oPath)
        Catch ex As Exception
            Logger.Error(ex)
        End Try
    End Sub
End Class