function Connect-NetboxAPI {
<#
    .SYNOPSIS
        Connects to the Netbox API and ensures Credential work properly
    
    .DESCRIPTION
        A detailed description of the Connect-NetboxAPI function.
    
    .PARAMETER Hostname
        A description of the Hostname parameter.
    
    .PARAMETER Credential
        A description of the Credential parameter.
    
    .PARAMETER Scheme
        A description of the Scheme parameter.
    
    .PARAMETER Port
        A description of the Port parameter.
    
    .PARAMETER URI
        A description of the URI parameter.
    
    .EXAMPLE
        PS C:\> Connect-NetboxAPI -Hostname "netbox.domain.com"
        
        This will prompt for Credential, then proceed to attempt a connection to Netbox
    
    .NOTES
        Additional information about the function.
#>
    
    [CmdletBinding(DefaultParameterSetName = 'Manual')]
    param
    (
        [Parameter(ParameterSetName = 'Manual',
                   Mandatory = $true)]
        [string]$Hostname,
        
        [Parameter(Mandatory = $false)]
        [pscredential]$Credential,
        
        [Parameter(ParameterSetName = 'Manual')]
        [ValidateSet('https', 'http', IgnoreCase = $true)]
        [string]$Scheme = 'https',
        
        [Parameter(ParameterSetName = 'Manual')]
        [uint16]$Port = 443,
        
        [Parameter(ParameterSetName = 'URI',
                   Mandatory = $true)]
        [string]$URI
    )
    
    if (-not $Credential) {
        try {
            $Credential = Get-NetboxCredential -ErrorAction Stop
        } catch {
            # Credentials are not set... Try to obtain from the user
            if (-not ($Credential = Get-Credential -UserName 'username-not-applicable' -Message "Enter token for Netbox")) {
                throw "Token is necessary to connect to a Netbox API."
            }
        }
    }
    
    $null = Set-NetboxCredential -Credential $Credential
    
    switch ($PSCmdlet.ParameterSetName) {
        'Manual' {
            $uriBuilder = [System.UriBuilder]::new($Scheme, $Hostname, $Port)
        }
        
        'URI' {
            $uriBuilder = [System.UriBuilder]::new($URI)
            if ([string]::IsNullOrWhiteSpace($uriBuilder.Host)) {
                throw "URI appears to be invalid. Must be in format [host.name], [scheme://host.name], or [scheme://host.name:port]"
            }
        }
    }
    
    $null = Set-NetboxHostName -Hostname $uriBuilder.Host
    $null = Set-NetboxHostScheme -Scheme $uriBuilder.Scheme
    $null = Set-NetboxHostPort -Port $uriBuilder.Port
    
    try {
        Write-Verbose "Verifying API connectivity..."
        $null = VerifyAPIConnectivity
    } catch {
        Write-Verbose "Failed to connect. Generating error"
        Write-Verbose $_.Exception.Message
        if (($_.Exception.Response) -and ($_.Exception.Response.StatusCode -eq 403)) {
            throw "Invalid token"
        } else {
            throw $_
        }
    }
    
    Write-Verbose "Caching API definition"
    $script:NetboxConfig.APIDefinition = Get-NetboxAPIDefinition
    
    if ([version]$script:NetboxConfig.APIDefinition.info.version -lt 2.8) {
        $Script:NetboxConfig.Connected = $false
        throw "Netbox version is incompatible with this PS module. Requires >=2.8.*, found version $($script:NetboxConfig.APIDefinition.info.version)"
    }
    
    $script:NetboxConfig.Connected = $true
    Write-Verbose "Successfully connected!"
    
    #Write-Verbose "Caching static choices"
    #$script:NetboxConfig.Choices.Circuits = Get-NetboxCircuitsChoices
    #$script:NetboxConfig.Choices.DCIM = Get-NetboxDCIMChoices # Not completed yet
    #$script:NetboxConfig.Choices.Extras = Get-NetboxExtrasChoices
    #$script:NetboxConfig.Choices.IPAM = Get-NetboxIPAMChoices
    ##$script:NetboxConfig.Choices.Secrets = Get-NetboxSecretsChoices    # Not completed yet
    ##$script:NetboxConfig.Choices.Tenancy = Get-NetboxTenancyChoices
    #$script:NetboxConfig.Choices.Virtualization = Get-NetboxVirtualizationChoices
    
    Write-Verbose "Connection process completed"
}