module Network.JSONApi.DocumentSpec where

import Control.Lens ((^?))
import Data.Aeson (ToJSON)
import qualified Data.Aeson as AE
import qualified Data.Aeson.Lens as Lens
import Data.ByteString.Lazy.Char8 (ByteString)
import qualified Data.ByteString.Lazy.Char8 as BS
import Data.Either (isRight)
import Data.Maybe
import Network.JSONApi
import TestHelpers
import Test.Hspec

main :: IO ()
main = hspec spec

spec :: Spec
spec =
  describe "JSON serialization" $ do
    it "JSON encodes/decodes a singleton resource" $ do
      -- TODO: test the main resource actually is a singleton
      let jsonApiObj = mkDocument [testObject] Nothing Nothing
      let encodedJson = encodeDocumentObject jsonApiObj
      let decodedJson = decodeDocumentObject encodedJson
      putStrLn (BS.unpack encodedJson)
      putStrLn (show decodedJson)
      isRight decodedJson `shouldBe` True

    it "JSON encodes/decodes a list of resources" $ do
      -- TODO: test the main resource actually is a list
      let jsonApiObj = mkDocument [testObject, testObject2] Nothing Nothing
      let encodedJson = encodeDocumentObject jsonApiObj
      let decodedJson = decodeDocumentObject encodedJson
      {- putStrLn (BS.unpack encodedJson) -}
      {- putStrLn (show decodedJson) -}
      isRight decodedJson `shouldBe` True

    it "contains the allowable top-level keys" $ do
      let jsonApiObj = mkDocument [testObject] Nothing Nothing
      let encodedJson = encodeDocumentObject jsonApiObj
      let dataObject = encodedJson ^? Lens.key "data"
      let linksObject = encodedJson ^? Lens.key "links"
      let metaObject = encodedJson ^? Lens.key "meta"
      let includedObject = encodedJson ^? Lens.key "included"
      isJust dataObject `shouldBe` True
      isJust linksObject `shouldBe` True
      isJust metaObject `shouldBe` True
      isJust includedObject `shouldBe` True

    it "allows an optional top-level links object" $ do
      let jsonApiObj = mkDocument [testObject] (Just linksObj) Nothing
      let encodedJson = encodeDocumentObject jsonApiObj
      let decodedJson = decodeDocumentObject encodedJson
      -- putStrLn (BS.unpack encodedJson)
      -- putStrLn $ show decodedJson
      isRight decodedJson `shouldBe` True

    it "allows an optional top-level meta object" $ do
      let jsonApiObj = mkDocument [testObject] Nothing (Just testMetaObj)
      let encodedJson = encodeDocumentObject jsonApiObj
      let decodedJson = decodeDocumentObject encodedJson
      -- putStrLn (BS.unpack encodedJson)
      -- putStrLn $ show decodedJson
      isRight decodedJson `shouldBe` True

    it "allows a heterogeneous list of related resources" $ do
      let includedResources = (mkIncludedResource testObject) <> (mkIncludedResource testObject2)
      let jsonApiObj = mkCompoundDocument [testObject] Nothing Nothing includedResources
      let encodedJson = encodeDocumentObject jsonApiObj
      let decodedJson = decodeDocumentObject encodedJson
      {- putStrLn (BS.unpack encodedJson) -}
      {- putStrLn $ show decodedJson -}
      isRight decodedJson `shouldBe` True

decodeDocumentObject :: ByteString
                    -> Either String (Document TestResource)
decodeDocumentObject = AE.eitherDecode

encodeDocumentObject :: (ToJSON a) => Document a -> ByteString
encodeDocumentObject = prettyEncode