{-# LANGUAGE DeriveGeneric #-}
{-# LANGUAGE ScopedTypeVariables #-}

module Main where

import Control.Applicative
import Database.Bloodhound
import Data.Aeson
import Data.List (nub)
import Data.List.NonEmpty (NonEmpty(..))
import Data.Time.Calendar (Day(..))
import Data.Time.Clock (secondsToDiffTime, UTCTime(..))
import Data.Text (Text)
import qualified Data.Text as T
import GHC.Generics (Generic)
import Network.HTTP.Client
import qualified Network.HTTP.Types.Status as NHTS
import Prelude hiding (filter, putStrLn)
import Test.Hspec
import Test.Hspec.QuickCheck (prop)
import Test.QuickCheck

testServer  :: Server
testServer  = Server "http://localhost:9200"
testIndex   :: IndexName
testIndex   = IndexName "bloodhound-tests-twitter-1"
testMapping :: MappingName
testMapping = MappingName "tweet"

validateStatus :: Response body -> Int -> Expectation
validateStatus resp expected =
  (NHTS.statusCode $ responseStatus resp)
  `shouldBe` (expected :: Int)

createExampleIndex :: IO Reply
createExampleIndex = createIndex testServer defaultIndexSettings testIndex
deleteExampleIndex :: IO Reply
deleteExampleIndex = deleteIndex testServer testIndex

data Location = Location { lat :: Double
                         , lon :: Double } deriving (Eq, Generic, Show)

data Tweet = Tweet { user     :: Text
                   , postDate :: UTCTime
                   , message  :: Text
                   , age      :: Int
                   , location :: Location }
           deriving (Eq, Generic, Show)

instance ToJSON   Tweet
instance FromJSON Tweet
instance ToJSON   Location
instance FromJSON Location

data TweetMapping = TweetMapping deriving (Eq, Show)

instance ToJSON TweetMapping where
  toJSON TweetMapping =
    object ["tweet" .=
      object ["properties" .=
        object ["location" .= object ["type" .= ("geo_point" :: Text)]]]]

exampleTweet :: Tweet
exampleTweet = Tweet { user     = "bitemyapp"
                     , postDate = UTCTime
                                  (ModifiedJulianDay 55000)
                                  (secondsToDiffTime 10)
                     , message  = "Use haskell!"
                     , age      = 10000
                     , location = Location 40.12 (-71.34) }

otherTweet :: Tweet
otherTweet = Tweet { user     = "notmyapp"
                   , postDate = UTCTime
                                (ModifiedJulianDay 55000)
                                (secondsToDiffTime 11)
                   , message  = "Use haskell!"
                   , age      = 1000
                   , location = Location 40.12 (-71.34) }

insertData :: IO ()
insertData = do
  _ <- deleteExampleIndex
  _ <- createExampleIndex
  _ <- putMapping testServer testIndex testMapping TweetMapping
  _ <- indexDocument testServer testIndex testMapping exampleTweet (DocId "1")
  _ <- refreshIndex testServer testIndex
  return ()

insertOther :: IO ()
insertOther = do
  _ <- indexDocument testServer testIndex testMapping otherTweet (DocId "2")
  _ <- refreshIndex testServer testIndex
  return ()

searchTweet :: Search -> IO (Either String Tweet)
searchTweet search = do
  reply <- searchByIndex testServer testIndex search
  let result = eitherDecode (responseBody reply) :: Either String (SearchResult Tweet)
  let myTweet = fmap (hitSource . head . hits . searchHits) result
  return myTweet

searchExpectNoResults :: Search -> IO ()
searchExpectNoResults search = do
  reply <- searchByIndex testServer testIndex search
  let result = eitherDecode (responseBody reply) :: Either String (SearchResult Tweet)
  let emptyHits = fmap (hits . searchHits) result
  emptyHits `shouldBe` Right []

data BulkTest = BulkTest { name :: Text } deriving (Eq, Generic, Show)
instance FromJSON BulkTest
instance ToJSON BulkTest

noDuplicates :: Eq a => [a] -> Bool
noDuplicates xs = nub xs == xs

instance Arbitrary RegexpFlags where
  arbitrary = oneof [ pure AllRegexpFlags
                    , pure NoRegexpFlags
                    , SomeRegexpFlags <$> arbitrary
                    ]

instance Arbitrary a => Arbitrary (NonEmpty a) where
  arbitrary = liftA2 (:|) arbitrary arbitrary

instance Arbitrary RegexpFlag where
  arbitrary = oneof [ pure AnyString
                    , pure Automaton
                    , pure Complement
                    , pure Empty
                    , pure Intersection
                    , pure Interval
                    ]

main :: IO ()
main = hspec $ do

  describe "index create/delete API" $ do
    it "creates and then deletes the requested index" $ do
      -- priming state.
      _ <- deleteExampleIndex
      resp <- createExampleIndex
      deleteResp <- deleteExampleIndex
      validateStatus resp 200
      validateStatus deleteResp 200


  describe "document API" $ do
    it "indexes, gets, and then deletes the generated document" $ do
      _ <- insertData
      docInserted <- getDocument testServer testIndex testMapping (DocId "1")
      let newTweet = eitherDecode
                     (responseBody docInserted) :: Either String (EsResult Tweet)
      fmap _source newTweet `shouldBe` Right exampleTweet


  describe "bulk API" $ do
    it "inserts all documents we request" $ do
      _ <- insertData
      let firstTest = BulkTest "blah"
      let secondTest = BulkTest "bloo"
      let firstDoc = BulkIndex testIndex
                     testMapping (DocId "2") (object ["name" .= String "blah"])
      let secondDoc = BulkCreate testIndex
                     testMapping (DocId "3") (object ["name" .= String "bloo"])
      let stream = [firstDoc, secondDoc]
      _ <- bulk testServer stream
      _ <- refreshIndex testServer testIndex
      fDoc <- getDocument testServer testIndex testMapping (DocId "2")
      sDoc <- getDocument testServer testIndex testMapping (DocId "3")
      let maybeFirst  = eitherDecode $ responseBody fDoc :: Either String (EsResult BulkTest)
      let maybeSecond = eitherDecode $ responseBody sDoc :: Either String (EsResult BulkTest)
      fmap _source maybeFirst `shouldBe` Right firstTest
      fmap _source maybeSecond `shouldBe` Right secondTest


  describe "query API" $ do
    it "returns document for term query and identity filter" $ do
      _ <- insertData
      let query = TermQuery (Term "user" "bitemyapp") Nothing
      let filter = IdentityFilter <&&> IdentityFilter
      let search = mkSearch (Just query) (Just filter)
      myTweet <- searchTweet search
      myTweet `shouldBe` Right exampleTweet

    it "returns document for match query" $ do
      _ <- insertData
      let query = QueryMatchQuery $ mkMatchQuery (FieldName "user") (QueryString "bitemyapp")
      let search = mkSearch (Just query) Nothing
      myTweet <- searchTweet search
      myTweet `shouldBe` Right exampleTweet

    it "returns document for multi-match query" $ do
      _ <- insertData
      let fields = [FieldName "user", FieldName "message"]
      let query = QueryMultiMatchQuery $ mkMultiMatchQuery fields (QueryString "bitemyapp")
      let search = mkSearch (Just query) Nothing
      myTweet <- searchTweet search
      myTweet `shouldBe` Right exampleTweet

    it "returns document for bool query" $ do
      _ <- insertData
      let innerQuery = QueryMatchQuery $
                       mkMatchQuery (FieldName "user") (QueryString "bitemyapp")
      let query = QueryBoolQuery $
                  mkBoolQuery (Just innerQuery) Nothing Nothing
      let search = mkSearch (Just query) Nothing
      myTweet <- searchTweet search
      myTweet `shouldBe` Right exampleTweet

    it "returns document for boosting query" $ do
      _ <- insertData
      let posQuery = QueryMatchQuery $ mkMatchQuery (FieldName "user") (QueryString "bitemyapp")
      let negQuery = QueryMatchQuery $ mkMatchQuery (FieldName "user") (QueryString "notmyapp")
      let query = QueryBoostingQuery $ BoostingQuery posQuery negQuery (Boost 0.2)
      let search = mkSearch (Just query) Nothing
      myTweet <- searchTweet search
      myTweet `shouldBe` Right exampleTweet

    it "returns document for common terms query" $ do
      _ <- insertData
      let query = QueryCommonTermsQuery $
                  CommonTermsQuery (FieldName "user")
                  (QueryString "bitemyapp")
                  (CutoffFrequency 0.0001)
                  Or Or Nothing Nothing Nothing Nothing
      let search = mkSearch (Just query) Nothing
      myTweet <- searchTweet search
      myTweet `shouldBe` Right exampleTweet


  describe "sorting" $ do
    it "returns documents in the right order" $ do
      _ <- insertData
      _ <- insertOther
      let sortSpec = DefaultSortSpec $ mkSort (FieldName "age") Ascending
      let search = Search Nothing
                   (Just IdentityFilter) (Just [sortSpec])
                   False 0 10
      reply <- searchByIndex testServer testIndex search
      let result = eitherDecode (responseBody reply) :: Either String (SearchResult Tweet)
      let myTweet = fmap (hitSource . head . hits . searchHits) result
      myTweet `shouldBe` Right otherTweet


  describe "filtering API" $ do
    it "returns document for composed boolmatch and identity" $ do
      _ <- insertData
      let queryFilter = BoolFilter (MustMatch (Term "user" "bitemyapp") False)
                        <&&> IdentityFilter
      let search = mkSearch Nothing (Just queryFilter)
      myTweet <- searchTweet search
      myTweet `shouldBe` Right exampleTweet

    it "returns document for term filter" $ do
      _ <- insertData
      let termFilter = TermFilter (Term "user" "bitemyapp") False
      let search = mkSearch Nothing (Just termFilter)
      myTweet <- searchTweet search
      myTweet `shouldBe` Right exampleTweet

    it "returns document for existential filter" $ do
      _ <- insertData
      let search = mkSearch Nothing (Just (ExistsFilter (FieldName "user")))
      myTweet <- searchTweet search
      myTweet `shouldBe` Right exampleTweet

    it "returns document for geo boundingbox filter" $ do
      _ <- insertData
      let box = GeoBoundingBox (LatLon 40.73 (-74.1)) (LatLon 40.10 (-71.12))
      let bbConstraint = GeoBoundingBoxConstraint (FieldName "tweet.location") box False GeoFilterMemory
      let geoFilter = GeoBoundingBoxFilter bbConstraint
      let search = mkSearch Nothing (Just geoFilter)
      myTweet <- searchTweet search
      myTweet `shouldBe` Right exampleTweet

    it "doesn't return document for nonsensical boundingbox filter" $ do
      _ <- insertData
      let box          = GeoBoundingBox (LatLon 0.73 (-4.1)) (LatLon 0.10 (-1.12))
      let bbConstraint = GeoBoundingBoxConstraint (FieldName "tweet.location") box False GeoFilterMemory
      let geoFilter    = GeoBoundingBoxFilter bbConstraint
      let search       = mkSearch Nothing (Just geoFilter)
      searchExpectNoResults search

    it "returns document for geo distance filter" $ do
      _ <- insertData
      let geoPoint = GeoPoint (FieldName "tweet.location") (LatLon 40.12 (-71.34))
      let distance = Distance 10.0 Miles
      let optimizeBbox = OptimizeGeoFilterType GeoFilterMemory
      let geoFilter = GeoDistanceFilter geoPoint distance SloppyArc optimizeBbox False
      let search = mkSearch Nothing (Just geoFilter)
      myTweet <- searchTweet search
      myTweet `shouldBe` Right exampleTweet

    it "returns document for geo distance range filter" $ do
      _ <- insertData
      let geoPoint = GeoPoint (FieldName "tweet.location") (LatLon 40.12 (-71.34))
      let distanceRange = DistanceRange (Distance 0.0 Miles) (Distance 10.0 Miles)
      let geoFilter = GeoDistanceRangeFilter geoPoint distanceRange
      let search = mkSearch Nothing (Just geoFilter)
      myTweet <- searchTweet search
      myTweet `shouldBe` Right exampleTweet

    it "doesn't return document for wild geo distance range filter" $ do
      _ <- insertData
      let geoPoint = GeoPoint (FieldName "tweet.location") (LatLon 40.12 (-71.34))
      let distanceRange = DistanceRange (Distance 100.0 Miles) (Distance 1000.0 Miles)
      let geoFilter = GeoDistanceRangeFilter geoPoint distanceRange
      let search = mkSearch Nothing (Just geoFilter)
      searchExpectNoResults search

    it "returns document for geo polygon filter" $ do
      _ <- insertData
      let points = [LatLon 40.0 (-70.00),
                    LatLon 40.0 (-72.00),
                    LatLon 41.0 (-70.00),
                    LatLon 41.0 (-72.00)]
      let geoFilter = GeoPolygonFilter (FieldName "tweet.location") points
      let search = mkSearch Nothing (Just geoFilter)
      myTweet <- searchTweet search
      myTweet `shouldBe` Right exampleTweet

    it "doesn't return document for bad geo polygon filter" $ do
      _ <- insertData
      let points = [LatLon 40.0 (-70.00),
                    LatLon 40.0 (-71.00),
                    LatLon 41.0 (-70.00),
                    LatLon 41.0 (-71.00)]
      let geoFilter = GeoPolygonFilter (FieldName "tweet.location") points
      let search = mkSearch Nothing (Just geoFilter)
      searchExpectNoResults search

    it "returns document for ids filter" $ do
      _ <- insertData
      let filter = IdsFilter (MappingName "tweet") [DocId "1"]
      let search = mkSearch Nothing (Just filter)
      myTweet <- searchTweet search
      myTweet `shouldBe` Right exampleTweet

    it "returns document for range filter" $ do
      _ <- insertData
      let filter = RangeFilter (FieldName "age")
                   (Right (RangeLtGt (LessThan 100000.0) (GreaterThan 1000.0)))
                   RangeExecutionIndex False
      let search = mkSearch Nothing (Just filter)
      myTweet <- searchTweet search
      myTweet `shouldBe` Right exampleTweet

    it "returns document for regexp filter" $ do
      _ <- insertData
      let filter = RegexpFilter (FieldName "user") (Regexp "bite.*app")
                   AllRegexpFlags (CacheName "test") False (CacheKey "key")
      let search = mkSearch Nothing (Just filter)
      myTweet <- searchTweet search
      myTweet `shouldBe` Right exampleTweet

    it "doesn't return document for non-matching regexp filter" $ do
      _ <- insertData
      let filter = RegexpFilter (FieldName "user")
                   (Regexp "boy") AllRegexpFlags
                   (CacheName "test") False (CacheKey "key")
      let search = mkSearch Nothing (Just filter)
      searchExpectNoResults search


  describe "ToJSON RegexpFlags" $ do
    it "generates the correct JSON for AllRegexpFlags" $
      toJSON AllRegexpFlags `shouldBe` String "ALL"

    it "generates the correct JSON for NoRegexpFlags" $
      toJSON NoRegexpFlags `shouldBe` String "NONE"

    it "generates the correct JSON for SomeRegexpFlags" $
      let flags = AnyString :| [ Automaton
                               , Complement
                               , Empty
                               , Intersection
                               , Interval ]
      in toJSON (SomeRegexpFlags flags) `shouldBe` String "ANYSTRING|AUTOMATON|COMPLEMENT|EMPTY|INTERSECTION|INTERVAL"

    prop "removes duplicates from flags" $ \(flags :: RegexpFlags) ->
      let String str = toJSON flags
          flagStrs   = T.splitOn "|" str
      in noDuplicates flagStrs