#
# This script launches the VC redist executable and handles certain error scenarios.
#
param(
    [Parameter(Mandatory=$true)][String][ValidateNotNullOrEmpty()]$PayloadDirectory,
    [Parameter(Mandatory=$true)][String][ValidateSet("arm64","x64","x86")]$Architecture,
    [Parameter(Mandatory=$true)][String][ValidateNotNullOrEmpty()]$LogFile,
    [Parameter(Mandatory=$false)][String]$VersionToInstall
)

#
# Variables and helper functions
#

# Use transcript to log all output
$envTemp = [Environment]::GetEnvironmentVariable('TEMP', 'User')
$date = Get-Date -Format "yyyyMMddHHmmss"
$transcriptPath = "$envTemp\dd_vcredist_wrapper_" + $Architecture + "_" + $date + ".log"
Start-Transcript -Path $transcriptPath

# Gather VC runtime version information in registry and files, generating appropriate output
Function Collect-Version-Information($outputString)
{
    # Get registry version information
    $vcrtRegVersionNative = $missingVersion
    $vcrtRegVersionWOW = $missingVersion
    if (![string]::IsNullOrEmpty($vcrtRegKeyPathNative) -and (Test-Path $vcrtRegKeyPathNative)) {
        $vcrtRegKeyNative = Get-ItemProperty -Path $vcrtRegKeyPathNative
        $vcrtRegVersionNative = "$($vcrtRegKeyNative.Major).$($vcrtRegKeyNative.Minor).$($vcrtRegKeyNative.Bld).$($vcrtRegKeyNative.Rbld)"
    }
    if (![string]::IsNullOrEmpty($vcrtRegKeyPathWOW) -and (Test-Path $vcrtRegKeyPathWOW)) {
        $vcrtRegKeyWOW = Get-ItemProperty -Path $vcrtRegKeyPathWOW
        $vcrtRegVersionWOW = "$($vcrtRegKeyWOW.Major).$($vcrtRegKeyWOW.Minor).$($vcrtRegKeyWOW.Bld).$($vcrtRegKeyWOW.Rbld)"
    }

    $regVersionToCheck = $vcrtRegVersionNative
    if (($installType -eq [InstallType]::X64Native) -or ($installType -eq [InstallType]::Arm64Native) -and ($vcrtRegVersionNative -ne $vcrtRegVersionWOW)) {
        $vcrtRegVersion = "registry version mismatch"
        Write-Host "$outputString registry versions"
        if ($vcrtRegVersionNative -ne $missingVersion) {
            Write-Host "  native: $vcrtRegVersionNative"
        } else {
            Write-Host "  native: $missingVersionOutput"
        }
        if ($vcrtRegVersionWOW -ne $missingVersion) {
            Write-Host "  WOW:    $vcrtRegVersionWOW"
        } else {
            Write-Host "  WOW:    $missingVersionOutput"
        }
        $regVersionToCheck = $null
    } elseif ($installType -eq [InstallType]::X86OnX64) {
        $regVersionToCheck = $vcrtRegVersionWOW
    }

    if ($regVersionToCheck -ne $null) {
       if ($regVersionToCheck -ne $missingVersion) {
        $vcrtRegVersion = $regVersionToCheck
        Write-Host "$outputString registered version: $vcrtRegVersion"
        } else {
            Write-Host "No version registered"
        }
    }

    # Get file version information

    $vcrtFileVersion = $null
    Foreach ($redistFile in $allRedistFiles) {
        if (Test-Path -path "$systemDir\$redistFile") {
            $redistFileVersion = (Get-Item -LiteralPath "$systemDir\$redistFile").VersionInfo.FileVersionRaw
            $redistFileVersions += @{ $redistFile = $redistFileVersion }
            if ($vcrtFileVersion -eq $null) {
                $vcrtFileVersion = $redistFileVersion
            } elseif ($redistFileVersion -ne $vcrtFileVersion) {
                $vcrtFileVersion = "multiple versions found"
            }
        } else {
            $redistFileVersions += @{ $redistFile = $missingVersion }
        }
    }
    if ($vcrtFileVersion -eq $null) {
        $vcrtFileVersion = "no VC runtime files installed"
    }

    Write-Host "$outputString file version: $vcrtFileVersion"

    # If the registry and all file versions do not agree, list each file and its version

    $vcrtVersionConsistent = $true
    $outputStringLowerCase = $outputString.ToLower()
    if ($vcrtRegVersion -ne $vcrtFileVersion) {
        Write-Host "Inconsistent VC runtime install detected: registry version does not match file version"
        $vcrtVersionConsistent = $false
        $skipSoftRebootCheckReasons += "$outputStringLowerCase registry version does not match $outputStringLowerCase file version"
    } 
    if ($vcrtFileVersion -eq "multiple versions found") {
        Write-Host "Inconsistent VC runtime install detected: not all files have same version"
        $vcrtVersionConsistent = $false
        $skipSoftRebootCheckReasons += "not all $outputStringLowerCase files have same version"
    }
    if (! $vcrtVersionConsistent ) {
        Foreach ($redistFile in $allRedistFiles) {
            $redistFileVersionValue = $redistFileVersions[$redistFile]
            if ($redistFileVersionValue -eq $missingVersion) { $redistFileVersionValue = "not installed"}
            Write-Host "  ${redistFile}:  $redistFileVersionValue"
        }
        $vcrtVersionConsistent = $false
    }

    $vcrtVersion = $vcrtRegVersion
    if ($vcrtVersionConsistent -eq $false) {
        $vcrtVersion = $null
    }

    return $vcrtVersionConsistent, $vcrtVersion
}

#
# Main execution sequence
#

# Initialize variables

$envMachineArch = [Environment]::GetEnvironmentVariable("PROCESSOR_ARCHITECTURE", 'Machine');
$envWINDIR = [Environment]::GetEnvironmentVariable('WINDIR', 'Machine')

# These variables are initialized to default x64 native values and overridden as appropriate:
#   $installType = one of { X64Native, X86OnX64, X86Native }
#   $systemDir = where to find installed files
#   $registryPath[Native,WOW] = the paths to the Native and WOW registry keys

enum InstallType {
    Arm64Native
    X64Native
    X86OnX64
    X86Native
}

# Setting $systemDir needs to account for System32 redirection on 64-bit processors:
#
#   MachineArch Process  VCRTArch   TargetDirectory SystemDirValue
#   x64         64-bit   x64        System32        System32
#   x64         32-bit   x64        System32        Sysnative (avoids redirection to SysWOW64)
#   x64         64-bit   x86        SysWOW64        SysWOW64
#   x64         32-bit   x86        SysWOW64        System32 (redirects to SysWOW64)
#   x86         32-bit   x86        System32        System32
# arm64         64-bit arm64        System32        System32

$installType = [InstallType]::X64Native
$is64BitPS = [IntPtr]::Size -eq 8
$systemDir = "$envWINDIR\System32"
if ($Architecture -eq "x64" -and $is64BitPS -eq $false) {
    $systemDir = "$envWINDIR\Sysnative"
} elseif ($Architecture -eq "x86" -and $is64BitPS -eq $true) {
    $systemDir = "$envWINDIR\SysWOW64"
}

# Registry keys
$vcrtRegKeyPathNative = "HKLM:\Software\Microsoft\VisualStudio\14.0\VC\Runtimes\$Architecture"
$vcrtRegKeyPathWOW = "HKLM:\Software\WOW6432Node\Microsoft\VisualStudio\14.0\VC\Runtimes\$Architecture"
if ($envMachineArch -eq 'AMD64' -and $Architecture -eq 'x86') {
    $installType = [InstallType]::X86OnX64
} elseif ($envMachineArch -eq 'X86' -and $Architecture -eq 'x86') { 
    $installType = [InstallType]::X86Native
    $vcrtRegKeyPathWOW = ""
} elseif ($envMachineArch -eq 'ARM64') { 
    $installType = [InstallType]::Arm64Native
}

# The value "0.0.0.0" indicates the registry key is empty or the file is not present,
# which typically indicates the VCRT is not installed or only partially installed.
$missingVersion = "0.0.0.0"
$missingVersionOutput = "not found"

# List of VCRT files
$redistSharedFiles = @(
    "concrt140.dll",
    "mfc140.dll",
    "mfc140chs.dll",
    "mfc140cht.dll",
    "mfc140deu.dll",
    "mfc140enu.dll",
    "mfc140esn.dll",
    "mfc140fra.dll",
    "mfc140ita.dll",
    "mfc140jpn.dll",
    "mfc140kor.dll",
    "mfc140rus.dll",
    "mfc140u.dll",
    "msvcp140.dll",
    "msvcp140_1.dll",
    "msvcp140_2.dll",
    "msvcp140_atomic_wait.dll",
    "msvcp140_codecvt_ids.dll",
    "vcamp140.dll",
    "vccorlib140.dll",
    "vcomp140.dll",
    "vcruntime140.dll"
)
$redistIntelFiles = @(
    "mfcm140.dll",
    "mfcm140u.dll"
)
$redistX64Files = @(
    "vcruntime140_1.dll"
)

if ($Architecture -eq 'x64') {
    $allRedistFiles = @($redistSharedFiles) + @($redistIntelFiles) + @($redistX64Files)
} elseif ($Architecture -eq 'arm64') {
    $allRedistFiles = @($redistSharedFiles) + @($redistX64Files)
} else {
    $allRedistFiles = @($redistSharedFiles) + @($redistIntelFiles)
}

# Begin output

Write-Host "Installing Visual C++ Redist"
Write-Host "Inputs:"
Write-Host "  PayloadDirectory: $PayloadDirectory"
Write-Host "  Architecture:     $Architecture"
Write-Host "  LogFile:          $LogFile"
Write-Host "  VersionToInstall: $VersionToInstall" 
Write-Host "Environment:"
Write-Host "  WINDIR:           $envWINDIR"
Write-Host "  TEMP:             $envTemp" 
Write-Host "  system directory: $systemDir"
Write-Host "  native reg. key:  $vcrtRegKeyPathNative"
Write-Host "  WOW64 reg. key:   $vcrtRegKeyPathWOW"
Write-Host "Installing $Architecture Visual C++ Runtime on $envMachineArch system"

$checkForSoftReboot = $true
$skipSoftRebootCheckReasons = @()

# Lookup current versions in registry and files to determine if there is 
# a consistent VC Runtime installation. An inconsistent initial install does not
# disable soft-reboot since it can be a valid state (vc_redist installs a full
# set of runtime files, then an MSM install updates only a subset of files).

$vcrtIsInitialInstallConsistent, $vcrtUpdatedVersion = Collect-Version-Information("Initial")
if (! $vcrtIsInitialInstallConsistent ) {
    Write-Host "Information: initial VC runtime install is not consistent"
}

# Run VCRT install command with parameters used for VS installs
#   command: $PayloadDirectory\vc_redist.$Architecture.exe /q /norestart /log $LogFile
#   example: VC_redist.x64.exe /q /norestart /log <logfilename>
# Use Start-Process to wait for exit and pass-thru the exit code

$vcrtExePath=-join($PayloadDirectory, "\\VC_redist.", $Architecture, ".exe")
$vcrtInstallerVersion = (Get-Item -LiteralPath $vcrtExePath).VersionInfo.FileVersionRaw
Write-Host "Redist Installer Version: $vcrtInstallerVersion"

$vcrtProcess = Start-Process -FilePath $vcrtExePath -ArgumentList "/q /norestart /log $LogFile" -Wait -PassThru
$vcrtProcessExitCode = $vcrtProcess.ExitCode
Write-Host "Redist Exit Code:   $vcrtProcessExitCode"

# Gather updated versions in registry and files

$vcrtIsUpdatedInstallConsistent, $vcrtUpdatedVersion = Collect-Version-Information("Updated")
if (! $vcrtIsUpdatedInstallConsistent ) {
    Write-Host "Skipping soft-reboot check: updated VC runtime install is not consistent"
    $checkForSoftReboot = $false
}

if ((! [string]::IsNullOrEmpty($VersionToInstall)) -and ($vcrtUpdatedVersion -ne $VersionToInstall)) {
    $msg = "updated VC runtime version $vcrtUpdatedVersion does not match expected version $VersionToInstall"
    Write-Host "Skipping soft-reboot check: $msg"
    $checkForSoftReboot = $false
    $skipSoftRebootCheckReasons += $msg
}

$returnCode=$vcrtProcessExitCode
if ($vcrtProcessExitCode -ne 3010) {
    $msg = "redist exit code was not ERROR_SUCCESS_REBOOT_REQUIRED (3010)"
    Write-Host "Skipping soft-reboot check: $msg"
    $checkForSoftReboot = $false
    $skipSoftRebootCheckReasons += $msg
}

if ($checkForSoftReboot -and ($vcrtIsUpdatedInstallConsistent -eq $true)) {
    # The soft-reboot case occurs when the installer returns ERROR_SUCCESS_REBOOT_REQUIRED (3010), 
    # but all files were actuall updated and the VCRT install is consistent. In this case, convert
    # the return code to NS_S_REBOOT_RECOMMENDED (862968) for soft reboot. This code is defined in
    # files nserror.h and zunenserror.h and can be identified by http://errors.
    Write-Host "Soft-reboot conditions detected, changing exit code from 3010 to 862968"
    $returnCode = 862968
} else {
    Write-Host "Reasons for skipping soft-reboot check:"
    Foreach ($reason in $skipSoftRebootCheckReasons) {
        Write-Host "  $reason"
    }
}

Write-Host "Wrapper Exit Code:  $returnCode"
Stop-Transcript
exit $returnCode

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