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{-# LANGUAGE TemplateHaskell #-}

{-# OPTIONS_GHC -fno-warn-orphans #-}

{-| Unittests for @xm list --long@ parser -}

{-

Copyright (C) 2013 Google Inc.

This program is free software; you can redistribute it and/or modify

it under the terms of the GNU General Public License as published by

the Free Software Foundation; either version 2 of the License, or

(at your option) any later version.

This program is distributed in the hope that it will be useful, but

WITHOUT ANY WARRANTY; without even the implied warranty of

MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU

General Public License for more details.

You should have received a copy of the GNU General Public License

along with this program; if not, write to the Free Software

Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA

02110-1301, USA.

-}

module Test.Ganeti.Hypervisor.Xen.XmParser

  ( testHypervisor_Xen_XmParser

  ) where

import Test.HUnit

import Test.QuickCheck as QuickCheck hiding (Result)

import Test.Ganeti.TestHelper

import Test.Ganeti.TestCommon

import Control.Monad (liftM)

import qualified Data.Attoparsec.Text as A

import Data.Text (pack)

import Data.Char

import qualified Data.Map as Map

import Ganeti.Hypervisor.Xen.Types

import Ganeti.Hypervisor.Xen.XmParser

{-# ANN module "HLint: ignore Use camelCase" #-}

-- * Arbitraries

-- | Arbitrary instance for generating configurations.

-- A completely arbitrary configuration would contain too many lists and its

-- size would be to big to be actually parsable in reasonable time.

-- This Arbitrary builds a random Config that is still of a reasonable size.

-- Avoid generating strings that might be interpreted as numbers.

instance Arbitrary LispConfig where

  arbitrary = frequency

    [ (5, liftM LCString (genName `suchThat` (not . canBeNumber)))

    , (5, liftM LCDouble arbitrary)

    , (1, liftM LCList (choose(1,20) >>= (`vectorOf` arbitrary)))

    ]

-- | Determines conservatively whether a string could be a number.

canBeNumber :: String -> Bool

canBeNumber [] = False

canBeNumber (c:[]) = canBeNumberChar c

canBeNumber (c:xs) = canBeNumberChar c && canBeNumber xs

-- | Determines whether a char can be part of the string representation of a

-- number (even in scientific notation).

canBeNumberChar :: Char -> Bool

canBeNumberChar c = isDigit c || (c `elem` "eE-")

-- * Helper functions for tests

-- | Function for testing whether a domain configuration is parsed correctly.

testDomain :: String -> Map.Map String Domain -> Assertion

testDomain fileName expectedContent = do

    fileContent <- readTestData fileName

    case A.parseOnly xmListParser $ pack fileContent of

        Left msg -> assertFailure $ "Parsing failed: " ++ msg

        Right obtained -> assertEqual fileName expectedContent obtained

-- | Determines whether two LispConfig are equal, with the exception of Double

-- values, that just need to be "almost equal".

-- Meant mainly for testing purposes, given that Double values may be slightly

-- rounded during parsing.

isAlmostEqual :: LispConfig -> LispConfig -> Bool

isAlmostEqual (LCList c1) (LCList c2) =

  (length c1 == length c2) &&

  foldr

    (\current acc -> (acc && uncurry isAlmostEqual current))

    True

    (zip c1 c2)

isAlmostEqual (LCString s1) (LCString s2) = s1 == s2

isAlmostEqual (LCDouble d1) (LCDouble d2) = abs (d1-d2) <= 1e-12

isAlmostEqual _ _ = False

-- | Function to serialize LispConfigs in such a way that they can be rebuilt

-- again by the lispConfigParser.

serializeConf :: LispConfig -> String

serializeConf (LCList c) = "(" ++ unwords (map serializeConf c) ++ ")"

serializeConf (LCString s) = s

serializeConf (LCDouble d) = show d

-- | Test whether a randomly generated config can be parsed.

-- Implicitly, this also tests that the Show instance of Config is correct.

prop_config :: LispConfig -> Property

prop_config conf =

  case A.parseOnly lispConfigParser . pack . serializeConf $ conf of

        Left msg -> fail $ "Parsing failed: " ++ msg

        Right obtained -> property $ isAlmostEqual obtained conf

-- | Test a Xen 4.0.1 @xm list --long@ output.

case_xen401list :: Assertion

case_xen401list = testDomain "xen-xm-list-long-4.0.1.txt" $

  Map.fromList

    [ ("Domain-0", Domain 0 "Domain-0" 184000.41332 ActualRunning Nothing)

    , ("instance1.example.com", Domain 119 "instance1.example.com" 24.116146647

      ActualBlocked Nothing)

    ]

testSuite "Hypervisor/Xen/XmParser"

          [ 'prop_config

          , 'case_xen401list

          ]