content: -- Copyright (c) 2016-present, Facebook, Inc.
  -- All rights reserved.
  --
  -- This source code is licensed under the BSD-style license found in the
  -- LICENSE file in the root directory of this source tree.
  
  
  {-# LANGUAGE GADTs #-}
  {-# LANGUAGE LambdaCase #-}
  {-# LANGUAGE OverloadedStrings #-}
  
  module Duckling.Ordinal.DE.Rules
    ( rules
    ) where
  
  import Data.Semigroup ((<>))
  import Prelude
  import Data.String
  import Data.Text (Text)
  import qualified Data.HashMap.Strict as HashMap
  import qualified Data.List as List
  import qualified Data.Text as Text
  
  import Duckling.Dimensions.Types
  import Duckling.Numeral.Helpers (parseInt)
  import Duckling.Ordinal.Helpers
  import Duckling.Regex.Types
  import Duckling.Types
  
  ordinalList :: [(Text, Int)]
  ordinalList =
    [ ("erste", 1)
    , ("zweite", 2)
    , ("dritte", 3)
    , ("vierte", 4)
    , ("fünfte", 5)
    , ("sechste", 6)
    , ("siebte", 7)
    , ("achte", 8)
    , ("neunte", 9)
    , ("zehnte", 10)
    , ("elfte", 11)
    , ("zwölfte", 12)
    , ("dreizente", 13)
    , ("vierzehnte", 14)
    , ("fünfzehnte", 15)
    , ("sechzente", 16)
    , ("siebzehnte", 17)
    , ("achtzehnte", 18)
    , ("neunzehnte", 19)
    , ("zwanzigste", 20)
    , ("einundzwanzigste", 21)
    , ("zweiundzwanzigste", 22)
    , ("dreiundzwanzigste", 23)
    , ("vierundzwanzigste", 24)
    , ("fünfundzwanzigste", 25)
    , ("sechsundzwanzigste", 26)
    , ("siebenundzwanzigste", 27)
    , ("achtundzwanzigste", 28)
    , ("neunundzwanzigste", 29)
    , ("dreissigste", 30)
    , ("dreißigste", 30)
    , ("einunddreissigste", 31)
    , ("einunddreißigste", 31)
    ]
  
  ruleOrdinalsFirstth :: Rule
  ruleOrdinalsFirstth = Rule
    { name = "ordinal (1..31)"
    , pattern =
      [ regex $ Text.unpack construction
      ]
    , prod = \case
        (Token RegexMatch (GroupMatch (match:_)):_) ->
          ordinal <$> HashMap.lookup (Text.toLower match) ordinalMap
        _ -> Nothing
    }
    where
      ordinalMap :: HashMap.HashMap Text Int
      ordinalMap = HashMap.fromList ordinalList
  
      construction :: Text
      construction =
        "("
        <> mconcat (List.intersperse "|" (fst <$> ordinalList))
        <> ")[rsn]?"
  
  ruleOrdinalDigits :: Rule
  ruleOrdinalDigits = Rule
    { name = "ordinal (digits)"
    , pattern =
      [ regex "(?<!\\d|\\.)0*(\\d+)(\\.(?!\\d)| ?(te(n|r|s)?)|(ste(n|r|s)?))"
      ]
    , prod = \case
        (Token RegexMatch (GroupMatch (match:_)):_) -> do
          v <- parseInt match
          Just $ ordinal v
        _ -> Nothing
    }
  
  rules :: [Rule]
  rules =
    [ ruleOrdinalsFirstth
    , ruleOrdinalDigits
    ]
  