{-# LANGUAGE OverloadedStrings #-}
{-# OPTIONS_GHC -Wno-unused-binds #-}

-- This file is part of the Wire Server implementation.
--
-- Copyright (C) 2025 Wire Swiss GmbH <opensource@wire.com>
--
-- This program is free software: you can redistribute it and/or modify it under
-- the terms of the GNU Affero General Public License as published by the Free
-- Software Foundation, either version 3 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 Affero General Public License for more
-- details.
--
-- You should have received a copy of the GNU Affero General Public License along
-- with this program. If not, see <https://www.gnu.org/licenses/>.

module Test.SAML2.WebSSO.RoundtripSpec
  ( spec,
  )
where

import Control.Lens
import Data.Aeson as Aeson
import Data.List (sort)
import Data.List.NonEmpty qualified as NL
import Data.Proxy
import Hedgehog
import Hedgehog.Gen as Gen
import SAML2.Core qualified as HS
import SAML2.WebSSO
import SAML2.WebSSO.Orphans ()
import SAML2.WebSSO.Test.Arbitrary
import SAML2.WebSSO.Test.Util
import Servant
import Test.Hspec

spec :: Spec
spec = hedgehog . checkParallel $ Group "hedgehog roundtrips" tests

numTests :: TestLimit
numTests = 120

scaledprop :: PropertyT IO () -> Property
scaledprop = withTests numTests . property

tests :: [(PropertyName, Property)]
tests =
  [ ( "instance HasXML Document",
      mkpropHasXML' normalizeDoc genXMLDocument
    ),
    ( "instance HasXML NameID",
      mkpropHasXML genNameID
    ),
    ( "instance HasXML IdPMetadata",
      mkpropHasXML genIdPMetadata
    ),
    ( "instance HasXML SPMetadata",
      mkpropHasXML genSPMetadata
    ),
    ( "instance HasXML AuthnRequest",
      mkpropHasXML genAuthnRequest
    ),
    ( "instance HasXML Conditions",
      mkpropHasXML' canonicalizeConditions . Gen.prune $ genConditions
    ),
    ( "instance HasXMLImport Conditions",
      mkpropHasXMLImport canonicalizeConditions (Proxy @HS.Conditions) . Gen.prune $ genConditions
    ),
    ( "instance HasXML AuthnResponse",
      mkpropHasXML' canonicalizeAuthnResponse . Gen.prune $ genAuthnResponse
      -- without the 'prune', this triggers https://github.com/hedgehogqa/haskell-hedgehog/issues/174
    ),
    ( "instance {From,To}JSON Config",
      mkpropJSON genConfig
    ),
    ( "instance {From,To}JSON IdPId",
      mkpropJSON genIdPId
    ),
    ( "instance {From,To}JSON Issuer",
      mkpropJSON genIssuer
    ),
    ( "instance {From,To}JSON URI",
      mkpropJSON genHttps
    ),
    ( "instance {From,To}JSON SignedCertificate",
      mkpropJSON genSignedCertificate
    ),
    ( "instance FromHttpApiData IdPId",
      mkpropHttpApiData genIdPId
    ),
    ( "instance FromHttpApiData (SimpleSetCookie (name :: Symbol))",
      mkpropHttpApiData (genSimpleSetCookie @"gnfz")
    ),
    ( "instance Mime{Render,Unrender} HTML (FormRedirect AuthnRequest)",
      mkpropMimeRender (Proxy @HTML) (genFormRedirect genAuthnRequest)
    )
    -- this one *almost* type-checks, and i'm not sure it's worth it...
    -- , ( "instance FromMultipart Mem AuthnResponseBody <=> authnResponseBodyToMultipart"
    --   , scaledprop $ Hedgehog.forAll genAuthnResponseBody >>=
    --       \a -> Hedgehog.tripping a authnResponseBodyToMultipart fromMultipart
    --   )
  ]

canonicalizeConditions :: Conditions -> Conditions
canonicalizeConditions = condAudienceRestriction %~ sort . fmap NL.sort

canonicalizeAuthnResponse :: AuthnResponse -> AuthnResponse
canonicalizeAuthnResponse = rspPayload %~ fmap (assConditions . _Just %~ canonicalizeConditions)

mkpropHasXML ::
  forall a.
  (Eq a, Show a, HasXML a) =>
  Gen a ->
  Property
mkpropHasXML = mkpropHasXML' id

mkpropHasXML' ::
  forall a.
  (Eq a, Show a, HasXML a) =>
  (a -> a) ->
  Gen a ->
  Property
mkpropHasXML' canon gen = scaledprop $ do
  v <- forAll (canon <$> gen)
  tripping v encodeElem (fmap canon . decodeElem @a @(Either String))

mkpropHasXMLImport ::
  forall them us.
  (Eq us, Show us, Show them, HasXMLImport us them) =>
  (us -> us) ->
  Proxy them ->
  Gen us ->
  Property
mkpropHasXMLImport canon _ gen = scaledprop $ do
  v <- forAll (canon <$> gen)
  tripping v exportXml (fmap canon . importXml @us @them @(Either String))

mkpropMimeRender ::
  forall t a.
  (Eq a, Show a, MimeRender t a, MimeUnrender t a) =>
  Proxy t ->
  Gen a ->
  Property
mkpropMimeRender proxy gen =
  scaledprop $
    Hedgehog.forAll gen >>= \a -> Hedgehog.tripping a (mimeRender proxy) (mimeUnrender proxy)

mkpropJSON ::
  forall a.
  (Eq a, Show a, FromJSON a, ToJSON a) =>
  Gen a ->
  Property
mkpropJSON gen =
  scaledprop $
    Hedgehog.forAll gen >>= \a -> Hedgehog.tripping a Aeson.encode Aeson.decode

mkpropHttpApiData ::
  forall a.
  (Eq a, Show a, FromHttpApiData a, ToHttpApiData a) =>
  Gen a ->
  Property
mkpropHttpApiData gen =
  scaledprop $
    Hedgehog.forAll gen >>= \a -> Hedgehog.tripping a toUrlPiece parseUrlPiece
