# encoding: utf-8
# author: Christoph Hartmann
# author: Dominik Richter

# Usage:
# describe pip('Jinja2') do
#   it { should be_installed }
# end
#
class PipPackage < Vulcano.resource(1)
  name 'pip'

  def initialize(package_name)
    @package_name = package_name
  end

  def info
    return @info if defined?(@info)

    @info = {}
    @info[:type] = 'pip'
    cmd = vulcano.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 installed?
    info[:installed] == true
  end

  def version
    info[:version]
  end

  def to_s
    "pip package  #{@package_name}"
  end

  private

  def pip_cmd
    # Pip is not on the default path for Windows, therefore we do some logic
    # to find the binary on Windows
    family = vulcano.os[:family]
    case family
    when 'windows'
      # we need to detect the pip command on Windows
      cmd = vulcano.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
end