<#
.SYNOPSIS
    Get a GitHub user's BlueSky
.DESCRIPTION
    Gets an At Protocol Handle / BlueSky profile link for a GitHub user
.EXAMPLE
    ./GitHubBlueSky StartAutomating
#>
param([string]$UserName)

# Globally cache to avoid repeat request (use script: inside of a function or module)
if (-not $global:GitHubProfileCache) {
    $global:GitHubProfileCache = [Ordered]@{}
}

# Get the user profile
if (-not $global:GitHubProfileCache[$UserName]) {
    $global:GitHubProfileCache[$UserName] = Invoke-WebRequest "https://github.com/$UserName"
}

# Skip empty entries
if (-not $global:GitHubProfileCache[$UserName]) { return }

$blueSkyProfile = ($global:GitHubProfileCache[$UserName].Links -match 'bsky' | Select-Object -ExpandProperty Href)

# If we have a bluesky profile
if ($blueSkyProfile) {
    # output an object linking the profiles
    [PSCustomObject]@{
        GitUserName = $UserName
        GitHubProfile = "https://github.com/$UserName"
        # and extract the username from the last segment
        AtUserName = ($blueSkyProfile -as [uri]).Segments[-1] -replace '/'
        BlueSkyProfile = $blueSkyProfile
    }
} else {
    # Otherwise, just output the git info
    [PSCustomObject]@{
        GitUserName = $UserName
        GitHubProfile = "https://github.com/$UserName"        
    }
}