using namespace System.Management.Automation
using namespace System.Management.Automation.Language

Register-ArgumentCompleter -Native -CommandName 'base64' -ScriptBlock {
    param($wordToComplete, $commandAst, $cursorPosition)

    $commandElements = $commandAst.CommandElements
    $command = @(
        'base64'
        for ($i = 1; $i -lt $commandElements.Count; $i++) {
            $element = $commandElements[$i]
            if ($element -isnot [StringConstantExpressionAst] -or
                $element.StringConstantType -ne [StringConstantType]::BareWord -or
                $element.Value.StartsWith('-') -or
                $element.Value -eq $wordToComplete) {
                break
        }
        $element.Value
    }) -join ';'

    $completions = @(switch ($command) {
        'base64' {
            [CompletionResult]::new('-w', 'w', [CompletionResultType]::ParameterName, 'Wrap encoded lines after n characters')
            [CompletionResult]::new('--wrap', 'wrap', [CompletionResultType]::ParameterName, 'Wrap encoded lines after n characters')
            [CompletionResult]::new('-c', 'c', [CompletionResultType]::ParameterName, 'c')
            [CompletionResult]::new('--color', 'color', [CompletionResultType]::ParameterName, 'color')
            [CompletionResult]::new('-d', 'd', [CompletionResultType]::ParameterName, 'Decode rather than encode')
            [CompletionResult]::new('--decode', 'decode', [CompletionResultType]::ParameterName, 'Decode rather than encode')
            [CompletionResult]::new('-i', 'i', [CompletionResultType]::ParameterName, 'Ignore whitespace when decoding')
            [CompletionResult]::new('--ignore-space', 'ignore-space', [CompletionResultType]::ParameterName, 'Ignore whitespace when decoding')
            [CompletionResult]::new('-v', 'v', [CompletionResultType]::ParameterName, 'output a diagnostic for every file processed')
            [CompletionResult]::new('--verbose', 'verbose', [CompletionResultType]::ParameterName, 'output a diagnostic for every file processed')
            [CompletionResult]::new('-q', 'q', [CompletionResultType]::ParameterName, 'Do not display header, even with multiple files')
            [CompletionResult]::new('--quiet', 'quiet', [CompletionResultType]::ParameterName, 'Do not display header, even with multiple files')
            [CompletionResult]::new('-h', 'h', [CompletionResultType]::ParameterName, 'Print help')
            [CompletionResult]::new('--help', 'help', [CompletionResultType]::ParameterName, 'Print help')
            break
        }
    })

    $completions.Where{ $_.CompletionText -like "$wordToComplete*" } |
        Sort-Object -Property ListItemText
}