$ProgressPreference = "SilentlyContinue"

function Backup-Create () {

    [CmdletBinding()]
    Param(
        [Parameter(Mandatory=$True)]
        [string]
        $source,
    
        [Parameter(Mandatory=$True)]
        [string]
        $dest,
    
        [Parameter(Mandatory=$True)]
        [string]
        $name,
    
        [Parameter(Mandatory=$True)]
        [object]
        $options
    )

    if ( -not (Get-Module -ListAvailable -Name sqlserver) ) {
        Throw "There is not sqlserver Powershell module"
    }
    if ( $options -eq $false ){
        Throw "you must define options for MSSQL action"
    }
    if ( -not ($options.ContainsKey("instance")) -or -not ($options.ContainsKey("server")) ) {
        Throw "Instance and server option needed"
    }
    if ( -not ( Get-SqlAgent -ServerInstance "$($options.server)\$($options.instance)" -EA SilentlyContinue ) ) {
        Throw "Can't connect to $($options.server)\$($options.instance)"
    }

    if ( $options.ContainsKey("compression") -and $options.compression -eq $true ) {
        Write-Debug "Compression output activated"
         $comp = "on"
         $ext = "zip"
    }
    else {
        Write-Debug "Compression disable"
        $comp = "off"
        $ext = "bak"
    }

    # Get databases on instance
    $dblist = Get-SqlDatabase -ServerInstance "$($options.server)\$($options.instance)" | Select Name

    #
    if (-not ( -not ($options.ContainsKey("databases")) -or $options.databases -eq "" -or $options.databases -eq "all" ))  {
        Write-Debug "Backup some databases : $($options.databases)"
        $dblist = $dblist | Where-Object { $_.Name -in ($options.databases).split(" ") }
    }

    $dblist | % {
        Set-Message "Backup database $($_.Name)"
        $db = $($_.Name)
        try {
            Backup-SqlDatabase -Database "$db" -ServerInstance  "$($options.server)\$($options.instance)" -CompressionOption $comp -BackupFile $dest\$db.$ext -EA SilentlyContinue
        }
        catch {
            Set-Warning "Can't backup $db"
        }
    }
}

Export-ModuleMember -Function Backup-Create