class PipPackage

def info
  return @info if defined?(@info)
  @info = {}
  @info[:type] = 'pip'
  cmd = inspec.command("#{pip_cmd} show #{@package_name}")
  return @info if cmd.exit_status != 0
  params = SimpleConfig.new(
    cmd.stdout,
    assignment_re: /^\s*([^:]*?)\s*:\s*(.*?)\s*$/,
    multiple_values: false,
  ).params
  @info[:name] = params['Name']
  @info[:version] = params['Version']
  @info[:installed] = true
  @info
end

def initialize(package_name)
  @package_name = package_name
end

def installed?
  info[:installed] == true
end

def pip_cmd
  # Pip is not on the default path for Windows, therefore we do some logic
  # to find the binary on Windows
  family = inspec.os[:family]
  case family
  when 'windows'
    # we need to detect the pip command on Windows
    cmd = inspec.command('New-Object -Type PSObject | Add-Member -MemberType NoteProperty -Name Pip -Value (Invoke-Command -ScriptBlock {where.exe pip}) -PassThru | Add-Member -MemberType NoteProperty -Name Python -Value (Invoke-Command -ScriptBlock {where.exe python}) -PassThru | ConvertTo-Json')
    begin
      paths = JSON.parse(cmd.stdout)
      # use pip if it on system path
      pipcmd = paths['Pip']
      # calculate path on windows
      if defined?(paths['Python']) && pipcmd.nil?
        pipdir = paths['Python'].split('\\')
        # remove python.exe
        pipdir.pop
        pipcmd = pipdir.push('Scripts').push('pip.exe').join('/')
      end
    rescue JSON::ParserError => _e
      return nil
    end
  end
  pipcmd || 'pip'
end

def to_s
  "Pip Package  #{@package_name}"
end

def version
  info[:version]
end