module Network.HTTP.Media.Language.Tests (tests) where

import Control.Monad (join)
import qualified Data.ByteString.Char8 as BS
import Data.Monoid ((<>))
import Data.String (fromString)
import Network.HTTP.Media.Accept
import Network.HTTP.Media.Language
import Network.HTTP.Media.Language.Gen
import Network.HTTP.Media.RenderHeader
import Test.QuickCheck ((===))
import Test.Tasty (TestTree, testGroup)
import Test.Tasty.QuickCheck (testProperty)
import Prelude hiding ((<>))

tests :: [TestTree]
tests =
  [ testEq,
    testShow,
    testFromString,
    testMatches,
    testMoreSpecific,
    testParseAccept
  ]

-- Equality is derived, but we test it here to get 100% coverage.
testEq :: TestTree
testEq =
  testGroup
    "Eq"
    [ testProperty "==" $ do
        lang <- genLanguage
        return $ lang === lang,
      testProperty "/=" $ do
        lang <- genLanguage
        lang' <- genDiffLanguage lang
        return $ lang /= lang'
    ]

testShow :: TestTree
testShow = testProperty "show" $ do
  lang <- genLanguage
  return $ parseAccept (BS.pack $ show lang) === Just lang

testFromString :: TestTree
testFromString = testProperty "fromString" $ do
  lang <- genLanguage
  return $ lang === fromString (show lang)

testMatches :: TestTree
testMatches =
  testGroup
    "matches"
    [ testProperty "Equal values match" $
        join matches <$> genLanguage,
      testProperty "Right prefix matches left" $
        uncurry (flip matches) <$> genMatchingLanguages,
      testProperty "Left prefix does not match right" $
        not . uncurry matches <$> genDiffMatchingLanguages,
      testProperty "* matches anything" $
        flip matches anything <$> genLanguage,
      testProperty "No concrete language matches *" $
        not . matches anything <$> genConcreteLanguage
    ]

testMoreSpecific :: TestTree
testMoreSpecific =
  testGroup
    "moreSpecificThan"
    [ testProperty "Against *" $
        flip moreSpecificThan anything <$> genConcreteLanguage,
      testProperty "With *" $
        not . moreSpecificThan anything <$> genLanguage,
      testProperty "Proper prefix lhs" $
        not . uncurry moreSpecificThan <$> genDiffMatchingLanguages,
      testProperty "Proper prefix rhs" $
        uncurry (flip moreSpecificThan) <$> genDiffMatchingLanguages,
      testProperty "Unrelated languages" $
        not . uncurry moreSpecificThan <$> genNonMatchingLanguages
    ]

testParseAccept :: TestTree
testParseAccept =
  testGroup
    "parseAccept"
    [ testProperty "Valid parse" $ do
        lang <- genLanguage
        return $ parseAccept (renderHeader lang) === Just lang,
      testProperty "Trailing hyphen" $ do
        bs <- renderHeader <$> genLanguage
        return $ (parseAccept $ bs <> "-" :: Maybe Language) === Nothing
    ]