functions/private/ConvertTo-O365.ps1

function ConvertTo-O365{
    [cmdletbinding()]
    param(
    [parameter(Mandatory=$true)]
    [ValidateNotNullOrEmpty()]
    [string] $Path,
    [Parameter()]
    [ValidateNotNullOrEmpty()]
    [string] $Separator = "`t",
    [Parameter(Mandatory=$true)]
    [hashtable] $Licenses
    )
    try{
        $Inventory = new-object -TypeName psobject -Property @{
            Users = @()
            Groups = @()
        }
        $Content = Import-CSV -Path $Path -Delimiter $Separator
        $CSVProperties = get-member -InputObject $Content -MemberType NoteProperty
        $UserProperties = @()
        [user]::new()|get-member -MemberType Property|%{$UserProperties += $_.Name}
        foreach($Property in $CSVProperties){
            if($UserProperties -notcontains $Property.Name){
                write-log -Type Error -Message "CSV was not in the correct format: '$($Property.Name)' is not recognized."
                return $null
            }
        }
        foreach($Item in $Content){
            $User = new-object User
            foreach($Property in $UserProperties){
                switch($Property){
                    "DisplayName" {$User.DisplayName = [Regex]::Replace($Item.First,'[^a-zA-Z0-9]', '') + "." + [Regex]::Replace($Item.Last,'[^a-zA-Z0-9]', '')}
                    "Password"{break;}
                    "Login"{break;}
                    "License" {
                        if(($License = $Licenses[$Item.License]) -ne $null){
                            
                            if($License.Available -le 0){
                                throw "There are not enough licenses available to provision the users ($($License.Name))"
                            }
                            $User.License = $License
                            $License.Available--
                        } else {
                            Write-Log -Type Warning -Message "License $($Item.License) for user $($Item.DisplayName) not found in the subscription"
                        }
                        break;
                    }
                    "Groups" {
                        $Group = new-object Group
                        <# if($Item.Groups.StartsWith('*')){
                            $Group.Owner = ([ref]$User).value
                            $Group.Name = $Item.Groups.substring(1,$Item.Groups.length - 1)
                            $found = $false
                            $Inventory.Groups.ForEach{
                                if($_.Name -eq $Group.Name){
                                    $_.Owner = ([ref]$Group.Owner).value
                                    $found = $true
                                }
                            }
                        } else { #>

                            $Group.Name = $Item.Groups
                            # }

                        if((($Inventory.Groups).ForEach{$_.Name}) -notcontains $Group.Name){
                            $Group.Owner = ([ref]$User).Value
                            $Inventory.Groups += $Group
                        } else {
                            $Group = ($Inventory.Groups.Where{$_.Name -eq $Group.Name})[0]
                        }
                        $User.Groups.Add($Group);
                        break;
                        
                    }
                    
                    default {$User.$_ = $Item.$_;break;}
                }
                
            }
            $Inventory.Users += $User
        }
        $global:a = $Inventory
        return $Inventory
        
    } catch {
        throw "Error while parsing CSV to O365 Inventory: '$_' @ $($_.InvocationInfo.ScriptLineNumber) - $($_.InvocationInfo.Line)"
    }

}