<#
.SYNOPSIS
    Installs or updates Visual Studio on a local developer machine.
.DESCRIPTION
    This installs Visual Studio along with all the workloads required to contribute to this repository.

.PARAMETER InstallPath
    The location of Visual Studio
.PARAMETER Passive
    Run the installer without requiring interaction.
.LINK
    https://visualstudio.com
    https://github.com/aspnet/AspNetCore/blob/master/docs/BuildFromSource.md
.EXAMPLE
    To install VS 2019 Preview, run this command in PowerShell:

        .\InstallVisualStudio.ps1
#>
[CmdletBinding(DefaultParameterSetName = 'Default')]
param(
    # TODO - once VS 2019 16.0 RTM is released, make this a parameter again
    # .PARAMETER Edition
    # Must be one of these values:

    # Community
    # Professional
    # Enterprise

    # Selects which 'offering' of Visual Studio to install.

    # [ValidateSet('Community', 'Professional', 'Enterprise')]
    # [string]$Edition,
    [string]$InstallPath,
    [switch]$Passive
)

# VS previews are only available publicly as 'Enterprise' versions. They should be available to the community to use without a paid license.
$Edition = 'Enterprise'

if (-not $Edition) {
    Write-Host "You must specify a value for the -Edition parameter which selects the kind of Visual Studio to install." -f Red
    Write-Host "Run ``Get-Help $PSCommandPath`` for more details." -f Red
    Write-Host ""
    Write-Host "Example:  ./InstallVisualStudio -Edition Community" -f Red
    Write-Host ""
    exit 1
}

$ErrorActionPreference = 'Stop'
Set-StrictMode -Version 1

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

$bootstrapper = "$intermedateDir\vsinstaller.exe"
$ProgressPreference = 'SilentlyContinue' # Workaround PowerShell/PowerShell#2138
Invoke-WebRequest -Uri "https://aka.ms/vs/16/pre/vs_$($Edition.ToLowerInvariant()).exe" -OutFile $bootstrapper

if (-not $InstallPath) {
    # $InstallPath = "${env:ProgramFiles(x86)}\Microsoft Visual Studio\2019\$Edition"
    $InstallPath = "${env:ProgramFiles(x86)}\Microsoft Visual Studio\2019\Preview"
}

# no backslashes - this breaks the installer
$InstallPath = $InstallPath.TrimEnd('\')

[string[]] $arguments = @()

if (Test-path $InstallPath) {
    $arguments += 'modify'
}

$arguments += `
    '--productId', "Microsoft.VisualStudio.Product.$Edition", `
    '--installPath', "`"$InstallPath`"", `
    '--in', "$PSScriptRoot\vs.json", `
    '--norestart'

if ($Passive) {
    $arguments += '--passive'
}

Write-Host ""
Write-Host "Installing Visual Studio 2019 $Edition" -f Magenta
Write-Host ""
Write-Host "Running '$bootstrapper $arguments'"

& $bootstrapper @arguments