param (
    [Parameter(Mandatory = $true)][string]$version,
    [Parameter(Mandatory = $true)][string]$arch
)

# Install MinGW.
if (-Not(Test-Path "C:\mingw64"))
{
    $file = "x86_64-4.9.2-release-win32-seh-rt_v4-rev3.7z"
    $url = "https://bintray.com/artifact/download/drewwells/generic/$file"
    Invoke-WebRequest -UserAgent wget -Uri $url -OutFile $file
    &7z x -oC:\ $file > $null
}

# Install Procdump
if (-Not(Test-Path "C:\procdump"))
{
    mkdir C:\procdump
    Invoke-WebRequest -UserAgent wget -Uri https://download.sysinternals.com/files/Procdump.zip -OutFile C:\procdump\procdump.zip
    &7z x -oC:\procdump\ C:\procdump\procdump.zip > $null
}

$env:PATH += ";C:\procdump;C:\mingw64\bin"

function GetGo($version) {
    $env:GOROOT = "C:\go\$version"
    if (-Not(Test-Path $env:GOROOT))
    {
        $file = "$version.windows-$arch.zip"
        $url = "https://dl.google.com/go/$file"
        Invoke-WebRequest -UserAgent wget -Uri $url -OutFile $file
        &7z x -oC:\go $file > $null
        Move-Item -Path C:\go\go -Destination $env:GOROOT -force
    }
}

if ($version -eq "gotip") {
    Exit 0
    $latest = Invoke-WebRequest -Uri https://golang.org/VERSION?m=text -UseBasicParsing | Select-Object -ExpandProperty Content
    GetGo $latest
    $env:GOROOT_BOOTSTRAP = $env:GOROOT
    $env:GOROOT = "C:\go\go-tip"
    Write-Host "Building Go with GOROOT_BOOTSTRAP $env:GOROOT_BOOTSTRAP"
    if (-Not(Test-Path $env:GOROOT)) {
        git clone https://go.googlesource.com/go C:\go\go-tip
        Push-Location -Path C:\go\go-tip\src
    } else {
        Push-Location -Path C:\go\go-tip\src
        git pull
    }
    .\make.bat
    Pop-Location
} else {
    # Install Go
    Write-Host "Finding latest patch version for $version"
    $version = Invoke-WebRequest -Uri 'https://golang.org/dl/?mode=json&include=all' -UseBasicParsing | foreach {$_.Content} | ConvertFrom-Json | foreach {$_.version} | Select-String -Pattern "^$version($|\.|beta|rc)" | Select-Object -First 1 | foreach {$_.Line}
    Write-Host "Go $version on $arch"
    GetGo $version
}

$env:GOPATH = "C:\gopath"
$env:PATH += ";$env:GOROOT\bin;$env:GOPATH\bin"
Write-Host $env:PATH
Write-Host $env:GOROOT
Write-Host $env:GOPATH

go version
go env
mingw32-make test