# helper script to be run by the task scheduler for automatic updates of the
# AutoTx service binaries and configuration file


# ------------------------------------------------------------------------------
$InstallationPath = "C:\Tools\AutoTx"
$ServiceName = "AutoTx"

$UpdateSourcePath = "C:\ATX\TARGET\d-vamp-dw\_AUTOTX_"
# ------------------------------------------------------------------------------


function Check-ServiceState([string]$ServiceName) {
    $Continue = $True
    try {
        $Service = Get-Service $ServiceName -ErrorAction Stop
        if ($Service.Status -ne "Running") {
            Write-Host "Service $($ServiceName) is not running."
            $Continue = $False
        }
    }
    catch {
        Write-Host $_.Exception.Message
        $Continue = $False
    }
    if ($Continue) {
        Return
    }
    Write-Host "ERROR: Service $($ServiceName) must be installed and running."
    Exit
}


function Exit-IfDirMissing([string]$DirName, [string]$Desc) {
    if (Test-Path -PathType Container $DirName) {
        Return
    }
    Write-Host "ERROR: can't find / access $($Desc) path: $($DirName)"
    Exit
}


function Stop-MyService {
    Write-Host -NoNewLine "Stopping service $($ServiceName): "
    try {
        Stop-Service $ServiceName -ErrorAction Stop
        Write-Host "[OK]" -Fore Green
    }
    catch {
        Write-Host "[FAILED]" -Fore Red
        Exit
    }
}


function Start-MyService {
    if ((Get-Service $ServiceName).Status -eq "Running") {
        Return
    }
    Write-Host -NoNewLine "Starting service $($ServiceName): "
    try {
        Start-Service $ServiceName -ErrorAction Stop
        Write-Host "[OK]" -Fore Green
    }
    catch {
        $ex = $_.Exception
        Write-Host "[FAILED]" -Fore Red
        Write-Host $ex.Message
    }
}


function Update-FileIfNewer([string]$SourcePath, [string]$Destination) {
    # SourcePath is expected to be a FILE (full path)
    # Destination is expected to be a DIRECTORY (full path)
    $SrcDir = Split-Path $SourcePath -Parent
    $SrcFile = Split-Path $SourcePath -Leaf
    $SrcFileNoSuffix = [io.path]::GetFileNameWithoutExtension($SrcFile)
    $SrcFileSuffix = [io.path]::GetExtension($SrcFile)
    $DstPath = "$($Destination)\$($SrcFile)"
    if (-Not (Test-Path "$DstPath")) {
        Write-Host "File not existing in destination, NOT UPDATING: $DstPath"
        Return
    }

    $SrcWriteTime = (Get-Item "$SourcePath").LastWriteTime
    $TgtWriteTime = (Get-Item "$DstPath").LastWriteTime
    if (-Not ($SrcWriteTime -gt $TgtWriteTime)) {
        Return
    }
    Write-Host "Found newer file at $($SourcePath), updating..."
    Stop-MyService

    $BakTimeStamp = Get-Date -Format s | foreach {$_ -replace ":", "."}
    $BakName = "$($SrcFileNoSuffix)_pre-$BakTimeStamp$SrcFileSuffix"
    Write-Host "Creating backup: $($BakName)"
    Rename-Item "$DstPath" "$Destination\$BakName"
    try {
        Copy-Item -Path $SourcePath -Destination $Destination -ErrorAction Stop
    }
    catch {
        $ex = $_.Exception
        Write-Host "Copying $($SourcePath) FAILED!" -Fore Red
        Write-Host $ex.Message
        Exit
    }
}


function Update-Configuration {
    $NewConfig = "$($UpdateConfigPath)\configuration.xml"
    if (Test-Path -PathType Leaf $NewConfig) {
        Update-FileIfNewer $NewConfig $InstallationPath
    }
}


function Copy-ServiceFiles {
    Write-Host -NoNewLine "Updating service binaries: "
    try {
        Copy-Item -Recurse -Force -ErrorAction Stop `
            -Path "$UpdateBinariesPath" `
            -Destination "$InstallationPath"
        # Copy-FileIfNew "configuration.xml" $ServiceDir
        # Copy-FileIfNew "status.xml" $ServiceDir
        # Copy-FileIfNew "service.log" $ServiceDir
        # Clear-Content "$($ServiceDir)\service.log"
        Write-Host "[OK]" -Fore Green
    }
    catch {
        $ex = $_.Exception
        Write-Host "[FAILED]" -Fore Red
        Write-Host $ex.Message
        Exit
    }
}


function Update-ServiceBinaries {
    $MarkerFile = "$($UpdateMarkerPath)\$($env:COMPUTERNAME)"
    if (Test-Path "$MarkerFile" -Type Leaf) {
        Return
    }
    Write-Host "No marker file found, trying to update service binaries..."
    Stop-MyService
    Copy-ServiceFiles
    New-Item -Type File "$MarkerFile" | Out-Null
}




# first check if the service is installed and running at all
Check-ServiceState $ServiceName

$UpdateConfigPath = "$($UpdateSourcePath)\Configs\$($env:COMPUTERNAME)"
$UpdateMarkerPath = "$($UpdateSourcePath)\Service\UpdateMarkers"
$UpdateBinariesPath = "$($UpdateSourcePath)\Service\LatestBinaries"

Exit-IfDirMissing $InstallationPath "installation"
Exit-IfDirMissing $UpdateSourcePath "update source"
Exit-IfDirMissing $UpdateConfigPath "configuration update"
Exit-IfDirMissing $UpdateMarkerPath "update marker"
Exit-IfDirMissing $UpdateBinariesPath "service binaries update"

Update-Configuration
Update-ServiceBinaries

Start-MyService