module Roux.SchemaOrgSpec (spec) where

import Data.Aeson (Value, decodeStrict)
import Data.CookLang (Duration (..), Metadata (..), Recipe (..), Section (..), SectionBodyItem (..))
import Data.List.NonEmpty (toList)
import Data.Maybe (fromJust, isJust)
import Data.Text (Text)
import qualified Data.Text as T
import qualified Data.Text.Encoding as TE
import Test.Hspec (Spec, describe, expectationFailure, it, shouldBe, shouldSatisfy)

import Roux.SchemaOrg

-- | Extract the first schema.org Recipe JSON-LD from HTML.
tryDecode :: Text -> Maybe Value
tryDecode html =
    case T.splitOn "<script type=\"application/ld+json" html of
        (_before : rest : _) ->
            -- Skip past the closing > of the opening script tag, which may have extra attributes
            let afterOpenTag = T.drop 1 (T.dropWhile (/= '>') rest)
             in case T.splitOn "</script>" afterOpenTag of
                    (jsonContent : _) -> decodeStrict (TE.encodeUtf8 (T.strip jsonContent))
                    _ -> Nothing
        _ -> Nothing

spec :: Spec
spec = describe "SchemaOrg" $ do
    describe "parseSchemaOrgRecipe" $ do
        it "parses fried-rice.html embedded JSON-LD" $ do
            html <- readFile "test-data/fried-rice.html"
            let decoded = tryDecode (T.pack html)
            decoded `shouldSatisfy` isJust
            let recipe = parseSchemaOrgRecipe (fromJust decoded)
            recipe `shouldSatisfy` isJust
            case recipe of
                Nothing -> expectationFailure "expected Just SchemaOrgRecipe, got Nothing"
                Just r -> do
                    soName r `shouldBe` "Fried Rice"
                    soRecipeYield r `shouldBe` Just "4 to 6 servings"
                    soTotalTime r `shouldBe` Just "PT20M"
                    soRecipeCuisine r `shouldBe` Just "asian"
                    length (soRecipeIngredient r) `shouldBe` 14
                    length (soRecipeInstructions r) `shouldBe` 4

        it "parses carrot-risotto.html embedded JSON-LD" $ do
            html <- readFile "test-data/carrot-risotto.html"
            let decoded = tryDecode (T.pack html)
            decoded `shouldSatisfy` isJust
            let recipe = parseSchemaOrgRecipe (fromJust decoded)
            recipe `shouldSatisfy` isJust
            case recipe of
                Nothing -> expectationFailure "expected Just SchemaOrgRecipe, got Nothing"
                Just r -> soName r `shouldBe` "Carrot Risotto With Chile Crisp"

    describe "parseISODuration" $ do
        let chk :: Text -> Maybe Duration -> IO ()
            chk input expected = parseISODuration input `shouldBe` expected

        it "PT20M -> 20 minutes" $ chk "PT20M" (Just (Duration 20 (Just "minutes")))
        it "PT1H -> 60 minutes" $ chk "PT1H" (Just (Duration 60 (Just "minutes")))
        it "PT1H30M -> 90 minutes" $ chk "PT1H30M" (Just (Duration 90 (Just "minutes")))
        it "P1D -> 1440 minutes" $ chk "P1D" (Just (Duration 1440 (Just "minutes")))
        it "P1DT2H -> 1560 minutes" $ chk "P1DT2H" (Just (Duration 1560 (Just "minutes")))
        it "PT30M -> 30 minutes" $ chk "PT30M" (Just (Duration 30 (Just "minutes")))
        it "empty string -> Nothing" $ chk "" Nothing
        it "human-readable -> Nothing" $ chk "20 minutes" Nothing

    describe "schemaOrgToCooklang" $ do
        let loadRecipeFile :: FilePath -> IO (Maybe SchemaOrgRecipe)
            loadRecipeFile path = do
                html <- readFile path
                let decoded = tryDecode (T.pack html)
                pure (parseSchemaOrgRecipe =<< decoded)

        let countMethodSteps :: Recipe -> Int
            countMethodSteps recipe =
                let sections = toList (recipeSections recipe)
                 in case filter (\s -> sectionName s == Just "Method") sections of
                        [s] ->
                            let bodyItems = toList (sectionBody s)
                             in length [() | SecStep _ <- bodyItems]
                        _ -> 0

        let checkStepCount :: FilePath -> String -> Int -> Spec
            checkStepCount path label expectedSteps = it ("preserves " <> label <> " step count in Cooklang conversion") $ do
                mRecipe <- loadRecipeFile path
                case mRecipe of
                    Nothing -> fail "Failed to parse schema.org recipe"
                    Just r -> do
                        let rawInstructions = soRecipeInstructions r
                        length rawInstructions `shouldBe` expectedSteps
                        case schemaOrgToCooklang r of
                            Left err -> fail err
                            Right cook -> do
                                let cookSteps = countMethodSteps cook
                                cookSteps `shouldBe` expectedSteps

        let checkMetadata :: FilePath -> String -> (SchemaOrgRecipe -> IO ()) -> Spec
            checkMetadata path label checks = it ("converts " <> label <> " schema.org recipe to Cooklang") $ do
                mRecipe <- loadRecipeFile path
                case mRecipe of
                    Nothing -> fail "Failed to parse schema.org recipe"
                    Just r -> do
                        checks r
                        case schemaOrgToCooklang r of
                            Left err -> fail err
                            Right _ -> pure ()

        checkStepCount "test-data/fried-rice.html" "fried-rice" 4

        checkStepCount "test-data/carrot-risotto.html" "carrot-risotto" 7

        checkMetadata "test-data/fried-rice.html" "fried-rice" $ \r ->
            case schemaOrgToCooklang r of
                Left err -> fail err
                Right cook -> do
                    metaTitle (recipeMetadata cook) `shouldBe` Just "Fried Rice"
                    metaSource (recipeMetadata cook) `shouldBe` Just "https://cooking.nytimes.com/recipes/12177-fried-rice"
                    metaCourse (recipeMetadata cook) `shouldBe` Just "one pot, side dish"
                    metaCuisine (recipeMetadata cook) `shouldBe` Just "asian"
                    metaTotalTime (recipeMetadata cook) `shouldBe` Just (Duration 20 (Just "minutes"))
                    metaTags (recipeMetadata cook) `shouldBe` ["egg", "rice", "vegetarian"]
                    metaDescription (recipeMetadata cook) `shouldSatisfy` isJust
                    let sections = toList (recipeSections cook)
                    length sections `shouldBe` 2

        checkMetadata "test-data/carrot-risotto.html" "carrot-risotto" $ \r ->
            case schemaOrgToCooklang r of
                Left err -> fail err
                Right cook -> do
                    metaTitle (recipeMetadata cook) `shouldBe` Just "Carrot Risotto With Chile Crisp"
                    metaAuthor (recipeMetadata cook) `shouldBe` Just "Alexa Weibel"
                    metaTags (recipeMetadata cook) `shouldSatisfy` (not . null)