<#
    .SYNOPSIS
    Checks whether the specified package has been installed using Chocolatey.

    .PARAMETER Name
    The name of the package to check.
#>
function Test-ChocoPackage {
    [OutputType([bool])]
    param(
        [string] $Name
    );

    -not [string]::IsNullOrEmpty((choco list --limit-output --exact $name));
}

<#
    .SYNOPSIS
    Checks whether a `winget` package with the specified id is installed.

    .PARAMETER ID
    The id of the package to check.
#>
function Test-WingetPackage {
    [OutputType([bool])]
    param(
        [string] $Name,
        [string[]] $ArgumentList
    )

    & { $null = winget list --accept-source-agreements -e --id $Name @ArgumentList; $?; };
}

<#
    .SYNOPSIS
    Checks whether a command with the specified name exists.

    .PARAMETER Name
    The name of the command to check.
#>
function Test-Command {
    param (
        [string] $Name
    )

    [bool] (Get-Command $Name -ErrorAction SilentlyContinue);
}

<#
    .SYNOPSIS
    Checks whether `winget` is working properly.
#>
function Test-Winget {
    (Test-Command winget) -and (
        & {
            $output = winget source update winget;

            $? -and -not ([System.Linq.Enumerable]::Any(
                [string[]]($output),
                [System.Func[string,bool]]{ param($line) $line -eq "Cancelled"; }));
        });
}

<#
    .SYNOPSIS
    Checks whether a package with the specified name is installed.

    .PARAMETER Name
    The name of the package to check.
#>
function Test-PSPackage {
    param(
        [string] $Name
    )

    [bool] (Get-Package $Name -ErrorAction SilentlyContinue);
}

<#
    .SYNOPSIS
    Checks whether a module with the specified name is installed.

    .PARAMETER Name
    The name of the module to check.
#>
function Test-PSModule {
    param(
        [string] $Name
    )

    [bool](Get-Module -ListAvailable $Name -ErrorAction SilentlyContinue);
}