<#
.SYNOPSIS
    Installs SQL Server 2016 Express LocalDB on a machine.
.DESCRIPTION
    This script installs Microsoft SQL Server 2016 Express LocalDB on a machine.
.PARAMETER Force
    Force the script to run the MSI, even it it appears LocalDB is installed.
.LINK
    https://docs.microsoft.com/en-us/sql/database-engine/configure-windows/sql-server-2016-express-localdb?view=sql-server-2016
    https://docs.microsoft.com/en-us/sql/database-engine/install-windows/install-sql-server-from-the-command-prompt?view=sql-server-2016
#>
param(
    [switch]$Force
)
$ErrorActionPreference = 'Stop'
$ProgressPreference = 'SilentlyContinue' # Workaround PowerShell/PowerShell#2138
Set-StrictMode -Version 1

$intermedateDir = "$PSScriptRoot\obj"
mkdir $intermedateDir -ErrorAction Ignore | Out-Null

if (-not $Force -and (Test-Path 'HKLM:\SOFTWARE\Microsoft\Microsoft SQL Server\RefCount\SqlLocalDB13')) {
    Write-Host "SQL Server 2016 Express LocalDB is already installed. Exiting without action. Call this script again with -Force to run the installation anyways."
    exit 0
}

Write-Host "Installing SQL Server 2016 Express LocalDB" -f Magenta

# Download SqlLocalDB.msi.
$installerFilename = "SqlLocalDB.msi"
$installerPath = "$intermedateDir\$installerFilename"
Write-Host ""
Write-Host "Downloading '$installerFilename' to '$installerPath'."
& "$PSScriptRoot\..\Download.ps1" 'https://download.microsoft.com/download/9/0/7/907AD35F-9F9C-43A5-9789-52470555DB90/ENU/SqlLocalDB.msi' $installerPath

# Install LocalDB.
$arguments = '/package', "`"$installerPath`"", '/NoRestart', '/Passive', `
  'IACCEPTSQLLOCALDBLICENSETERMS=YES', 'HIDEPROGRESSBAR=YES'
Write-Host ""
Write-Host "Running 'msiexec $arguments'."
$process = Start-Process msiexec.exe -ArgumentList $arguments -NoNewWindow -PassThru -Verbose -Wait
exit $process.ExitCode
