[CmdletBinding()]
param (
    [Parameter()]
    [String]
    $DestinationPath = 'C:\Program Files\win-acme'
)

<#
.SYNOPSIS
    Install win-acme
.DESCRIPTION
    This script downloads and installs the latest version of win-acme.
.PARAMETER DestinationPath
    Specifies the path into which win-acme is installed
.LINK
    https://www.win-acme.com/
#>

begin {
    # Prep
    $Releases = (Invoke-WebRequest 'https://api.github.com/repos/win-acme/win-acme/releases').Content | ConvertFrom-Json | Where-Object { $_.prerelease -eq $false -and $_.draft -eq $false }
    $ReleaseTag = ($Releases | Select-Object -First 1).tag_name

    # $InstallerUrl = 'https://github.com/win-acme/win-acme/releases/download/v2.2.9.1701/win-acme.v2.2.9.1701.x64.pluggable.zip'
    $InstallerUrl = "https://github.com/win-acme/win-acme/releases/download/$ReleaseTag/win-acme.$ReleaseTag.x64.pluggable.zip"
    $ArchivePath = Join-Path -Path $env:TEMP -ChildPath ($InstallerUrl | Select-String -Pattern "(win-acme\.v?(?:\d\.?)+\.x64\.pluggable\.zip)").Matches.Value

    # Exit if the application is already installed
    if (Test-Path $DestinationPath) { Write-Host 'win-acme is already installed.'; exit }
}

process {
    # Download

    try {
        Write-Host "Downloading application..."

        # Use Legacy WebClient for compatibility
        $ProgressPreference = 'SilentlyContinue'
        [Net.ServicePointManager]::SecurityProtocol = [Net.SecurityProtocolType]::Tls -bor [Net.SecurityProtocolType]::Tls11 -bor [Net.SecurityProtocolType]::Tls12
        (New-Object Net.WebClient).DownloadFile($InstallerUrl, $ArchivePath)
    } catch {
        throw "Failed downloading application. $_"
    }

    # Install
    try {
        Write-Host "Installing application..."

        Expand-Archive -Path $ArchivePath -DestinationPath $DestinationPath -Force

        # Add the DestinationPath to Path system environment variable
        if ($DestinationPath -notin $env:PATH) { [Environment]::SetEnvironmentVariable("Path", $env:Path + ";$DestinationPath\", [System.EnvironmentVariableTarget]::Machine) }
    } catch {
        throw "Failed installing application. $_"
    }
}

end {
    # Clean up

    if (-not (Test-Path -Path $ArchivePath)) {
        Write-Host "Removing package download from '$ArchivePath'"
        Remove-Item -Path $ArchivePath -Force
    }
}