<#
.SYNOPSIS
    Backup the AOS service files.

.DESCRIPTION

    Copyright © 2019 Microsoft. All rights reserved.
#>
[CmdletBinding()]
param
(
    [Parameter(Mandatory = $false, HelpMessage = "The path to the directory in which to write log files.")]
    [string]$LogDir
)

function PrepareDeltaDBsyncReportDeployment([string]$metadataPackagePath)
{
    $MetadataParentPath = Split-Path -Path $metadataPackagePath -Parent
    $deltaSyncFolder = Join-Path -Path $MetadataParentPath -ChildPath "DeltaSync"

    if (!(Test-Path -Path $deltaSyncFolder))
    {
        Write-ServicingLog "Creating delta sync folder." -Vrb
        New-Item -Path $deltaSyncFolder -ItemType Directory -Force | Out-Null
    }
    else
    {
        Write-ServicingLog "Deleting delta sync folder contents." -Vrb
        Get-ChildItem -Path $deltaSyncFolder | Remove-Item -Force -Recurse
    }

    Write-ServicingLog "Copying MD files from metadata package folder to delta sync folder." -Vrb
    $roboCopyLogFile = $null
    if ((-not [string]::IsNullOrWhiteSpace($LogDir)) -and (Test-Path -Path $LogDir))
    {
        $roboCopyLogFile = Join-Path $LogDir "DeltaSyncCopy.log"
        Write-ServicingLog "Copying MD files log: $roboCopyLogFile." -Vrb
    }

    Robocopy.exe $metadataPackagePath $deltaSyncFolder /s /W:5 /R:3 /nfl /ndl *AXSecurity*.md *AXTable*.md *AXView*.md *AXEdt*.md *.rdl *> $roboCopyLogFile
    $roboCopyExitCode = $LASTEXITCODE

    if (($roboCopyExitCode -ge 8) -or ($roboCopyExitCode -lt 0))
    {
        throw "Failed to copy MD files with RoboCopy exit code $roboCopyExitCode."
    }
    Write-ServicingLog "Copying MD files completed with RoboCopy exit code $roboCopyExitCode." -Vrb
}

# ALM Service keeps a "clean" copy of packages folder (i.e. only standard AX vanilla code) to start from on every build
# We want AOS service to backup the "Clean" state packages so rollback doesn't put custom code back
# after removing the ALM service's backup in the AOS update step.
# We can't do this in ALM Service script due to these inter-dependencies between ALM and AOS.
# This is a compromise solution awaiting ALM to do "clean" differently.
function Restore-ALMPackagesBackup
{
    $ALMPackagesCopyPath = Get-ALMPackageCopyPath
    if ($ALMPackagesCopyPath)
    {
        # Copy latest DevALMInstrumentor.ps1 before using it. This ensures we use the fix which prevents locking 
        # Microsoft.Dynamics.ApplicationPlatform.Instrumentation.dll. 
        $NewInstrumentationScript = "$PSScriptRoot\..\..\ALMService\Code\DevALMInstrumentor.ps1"
        if (Test-Path -Path $NewInstrumentationScript  -PathType leaf)
        {
            Write-ServicingLog "Copying latest DevALMInstrumentor.ps1 from $($NewInstrumentationScript) to $($env:DynamicsSDK) before using it." -Vrb
            Copy-Item $NewInstrumentationScript -Destination $env:DynamicsSDK -Force
        }

        $ALMBackupFlag = Join-Path -Path $ALMPackagesCopyPath -ChildPath "Packages\BackupComplete.txt"

        # Check if a completed backup exists.
        if (Test-Path -Path $ALMBackupFlag)
        {
            Write-ServicingLog "Restoring packages from ALM Service backup at $($ALMPackagesCopyPath)..."
            Write-ServicingLog "Calling $($ALMPackagesCopyRestore) script to restore packages..." -Vrb
            $ALMPackagesCopyRestore = Join-Path -Path $env:DynamicsSDK -ChildPath "PrepareForBuild.ps1"
            & $ALMPackagesCopyRestore
            Write-ServicingLog "Call to $($ALMPackagesCopyRestore) completed." -Vrb

            # PrepareForBuild script shuts down IIS service entirely, even though individual sites are already stopped.
            # This can break subsequent IIS web administration calls during servicing.
            # Calling Get-AosWebSitePhysicalPath will restart the service if needed
            # and leave the websites in the state they were in prior to IIS service stop
            $ALMTestWebRoot = Get-AosWebSitePhysicalPath
            Write-ServicingLog "Call to Get-AosWebSitePhysicalPath returned: $($ALMTestWebRoot)" -Vrb
        }
        else
        {
            Write-ServicingLog "Warning: No complete ALM Service backup found at $($ALMPackagesCopyPath). Skipping restore."
        }
    }
}

$ErrorActionPreference = "Stop"
Import-Module "$PSScriptRoot\CommonRollbackUtilities.psm1" -DisableNameChecking
Import-Module "$PSScriptRoot\AosEnvironmentUtilities.psm1" -Force -DisableNameChecking

# Initialize exit code.
[int]$ExitCode = 0

# Initialize the log file to use with Write-ServicingLog.
Set-ServicingLog -LogDir $LogDir -LogFileName "AosService-Backup_$([DateTime]::UtcNow.ToString("yyyyMMddHHmmss")).log"

try
{
    Write-ServicingLog "Starting AOS backup..."

    # $RunbookBackupFolder and $PSScriptRoot variables are populated directly from runbook.
    $BackupFolder = $RunbookBackupFolder

    if ([string]::IsNullOrEmpty($BackupFolder))
    {
        $BackupFolder = Join-Path -Path $PSScriptRoot -ChildPath "ManualAosServiceBackup"
    }

    # Determine if this is a developer/demo machine.
    $DeveloperBox = Get-DevToolsInstalled

    Write-ServicingLog "Backup folder: $($BackupFolder)"

    $webrootBackupFolder = Join-Path -Path $BackupFolder -ChildPath "webroot"
    $packageBackupFolder = Join-Path -Path $BackupFolder -ChildPath "packages"
    $webrootBackupFilePath = Join-Path -Path $webrootBackupFolder -ChildPath "webroot.zip"
    $packageBackupFilePath = Join-Path -Path $packageBackupFolder -ChildPath "packages.zip"
    $webrootBackupSymlinkFolder = Join-Path -Path $webrootBackupFolder -ChildPath "symlink"
    $packageBackupSymlinkFolder = Join-Path -Path $packageBackupFolder -ChildPath "symlink"

    $webroot = Get-AosWebSitePhysicalPath
    $packagePath = Get-AosPackageDirectory

    if (!(Test-Path -Path $webrootBackupFolder))
    {
        Write-ServicingLog "Creating new backup folder: $($webrootBackupFolder)" -Vrb
        New-Item -ItemType Directory -Path $webrootBackupFolder | Out-Null
    }

    if (!(Test-Path -Path $packageBackupFolder))
    {
        Write-ServicingLog "Creating new backup folder: $($packageBackupFolder)" -Vrb
        New-Item -ItemType Directory -Path $packageBackupFolder | Out-Null
    }

    if (!(Test-Path -Path $webrootBackupSymlinkFolder))
    {
        Write-ServicingLog "Creating new backup folder: $($webrootBackupSymlinkFolder)" -Vrb
        New-Item -ItemType Directory -Path $webrootBackupSymlinkFolder | Out-Null
    }

    if (!(Test-Path -Path $packageBackupSymlinkFolder))
    {
        Write-ServicingLog "Creating new backup folder: $($packageBackupSymlinkFolder)" -Vrb
        New-Item -ItemType Directory -Path $packageBackupSymlinkFolder | Out-Null
    }

    # Backup is not needed for dev/build/demo/vhd env as we don't support roll back in those environments.
    # This will save a lot fo disk space and time for those env when applying packages.
    if (!$DeveloperBox)
    {
        try
        {
            Write-ServicingLog "Creating backup of AOS webroot symlinks..."
            Copy-SymbolicLinks -SourcePath $webroot -DestinationPath $webrootBackupSymlinkFolder -Move

            $exclude = ""
            Write-ServicingLog "Creating backup of AOS webroot files..."
            Create-ZipFiles -sourceFolder:$webroot -destFile:$webrootBackupFilePath -filetypesExcluded:$exclude -zipLogDir:$LogDir

            # Restore AOS packages from complete ALM service backup if one is found.
            # Do this before creating backup of AOS package files.
            Restore-ALMPackagesBackup

            $exclude = "*.bak"
            Write-ServicingLog "Creating backup of AOS packages symlinks..."
            Copy-SymbolicLinks -SourcePath $packagePath -DestinationPath $packageBackupSymlinkFolder -Move

            Write-ServicingLog "Creating backup of AOS packages..."
            Create-ZipFiles -sourceFolder:$packagePath -destFile:$packageBackupFilePath -filetypesExcluded:$exclude -zipLogDir:$LogDir
        }
        catch
        {
            throw $_
        }
        finally
        {
            # Restore the symlinks after the backup regardless of error.
            Write-ServicingLog "Restoring AOS packages symlinks..." -Vrb
            Copy-SymbolicLinks -SourcePath $packageBackupSymlinkFolder -DestinationPath $packagePath

            Write-ServicingLog "Restoring AOS webroot symlinks..." -Vrb
            Copy-SymbolicLinks -SourcePath $webrootBackupSymlinkFolder -DestinationPath $webroot
        }
    }
    else
    {
        Write-ServicingLog "Skipping backup of AOS files as developer tools are installed."

        # Restore AOS packages from complete ALM service backup if one is found.
        Restore-ALMPackagesBackup
    }

    Write-ServicingLog "Preparing delta DbSync report deployment..."
    PrepareDeltaDBsyncReportDeployment -metadataPackagePath:$packagePath
}
catch
{
    # Ensure non-zero exit code if an exception is caught and no exit code set.
    if ($ExitCode -eq 0)
    {
        $ExitCode = 1024
    }

    $ErrorMessage = "Error during AOS backup: $($_)"

    Write-ServicingLog $ErrorMessage
    Write-ServicingLog $($_) -Vrb
    Write-ServicingLog "AOS backup script failed with exit code: $($ExitCode)."

    # Use throw to indicate error to AXUpdateInstaller.
    # In case of exceptions, the output is not captured, so only the error message and
    # log file contents will be available for diagnostics.
    throw "$($ErrorMessage) [Log: $(Get-ServicingLog)]"
}

Write-ServicingLog "AOS backup script completed with exit code: $($ExitCode)."
exit $ExitCode
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