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 OverloadedStrings #-}
  
  module Duckling.Ordinal.UK.Rules
    ( rules ) where
  
  import Data.HashMap.Strict (HashMap)
  import qualified Data.HashMap.Strict as HashMap
  import Control.Monad (join)
  import Data.Text (Text)
  import qualified Data.Text as Text
  import Prelude
  import Data.String
  
  import Duckling.Dimensions.Types
  import Duckling.Numeral.Helpers (parseInt)
  import Duckling.Ordinal.Helpers
  import Duckling.Regex.Types
  import Duckling.Types
  
  ordinalsFirstThMap :: HashMap Text Int
  ordinalsFirstThMap = HashMap.fromList
    [ ( "перш"                   , 1 )
    , ( "друг"                   , 2 )
    , ( "трет"                   , 3 )
    , ( "четверт" , 4 )
    , ( "п‘ят"                   , 5 )
    , ( "шост"                   , 6 )
    , ( "сьом"                   , 7 )
    , ( "восьм"             , 8 )
    , ( "дев‘ят"       , 9 )
    , ( "десят"             , 10 )
    , ( "одинадцят"             , 11 )
    , ( "дванадцят"             , 12 )
    , ( "тринадцят"             , 13 )
    , ( "чотирнадцят" , 14 )
    , ( "п‘ятнадцят"       , 15 )
    , ( "шістнадцят"       , 16 )
    , ( "сімнадцят"             , 17 )
    , ( "вісімнадцят" , 18 )
    , ( "дев‘ятнадцят" , 19 )
    , ( "двадцят"                               , 20 )
    ]
  
  ruleOrdinalsFirstth :: Rule
  ruleOrdinalsFirstth = Rule
    { name = "ordinals (first..19th)"
    , pattern =
      [ regex "(перш|друг|трет|четверт|п‘ят|шост|сьом|восьм|дев‘ят|десят|одинадцят|дванадцят|тринадцят|чотирнадцят|п‘ятнадцят|шістнадцят|сімнадцят|вісімнадцят|дев‘ятнадцят|двадцят)(ий|ій|а|я|е|є)"
      ]
    , prod = \tokens -> case tokens of
      (Token RegexMatch (GroupMatch (match:_)):_) ->
        ordinal <$> HashMap.lookup (Text.toLower match) ordinalsFirstThMap
      _ -> Nothing
    }
  
  ordinalTensMap :: HashMap Text Int
  ordinalTensMap = HashMap.fromList
    [ ( "двадцять"             , 20 )
    , ( "тридцять"             , 30 )
    , ( "сорок"                               , 40 )
    , ( "п‘ятдесят"       , 50 )
    , ( "шістдесят"       , 60 )
    , ( "сімдесят"             , 70 )
    , ( "вісімдесят" , 80 )
    , ( "дев‘яносто" , 90 )
    ]
  
  ruleOrdinal :: Rule
  ruleOrdinal = Rule
    { name = "ordinal 21..99"
    , pattern =
      [ regex "(двадцять|тридцять|сорок|п‘ятдесят|шістьдесят|сімдесят|вісімдесят|дев‘яносто)"
      , regex "(перш|друг|трет|четверт|п‘ят|шост|сьом|восьм|дев‘ят)(ий|ій|а|я|е|є)"
      ]
    , prod = \tokens -> case tokens of
        (Token RegexMatch (GroupMatch (m1:_)):
         Token RegexMatch (GroupMatch (m2:_)):
         _) -> do
          v1 <- HashMap.lookup (Text.toLower m1) ordinalTensMap
          v2 <- HashMap.lookup (Text.toLower m2) ordinalsFirstThMap -- map to 1..9
          Just . ordinal $ v1 + v2
        _ -> Nothing
    }
  
  ruleOrdinalDigits :: Rule
  ruleOrdinalDigits = Rule
    { name = "ordinal (digits)"
    , pattern =
      [ regex "0*(\\d+)-?((и|і)?й|а|я|е|є)"
      ]
    , prod = \tokens -> case tokens of
        (Token RegexMatch (GroupMatch (match:_)):_) -> ordinal <$> parseInt match
        _ -> Nothing
    }
  
  rules :: [Rule]
  rules =
    [ ruleOrdinal
    , ruleOrdinalDigits
    , ruleOrdinalsFirstth
    ]
  