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.Duration.HR.Rules
    ( rules ) where
  
  import Control.Monad (join)
  import Data.Maybe
  import Data.String
  import Data.Text (Text)
  import Prelude
  import qualified Data.Text as Text
  
  import Duckling.Dimensions.Types
  import Duckling.Duration.Helpers
  import Duckling.Duration.Types (DurationData (..))
  import Duckling.Numeral.Helpers (parseInteger)
  import Duckling.Numeral.Types (NumeralData(..))
  import Duckling.Regex.Types
  import Duckling.Types
  import qualified Duckling.Duration.Types as TDuration
  import qualified Duckling.Numeral.Types as TNumeral
  import qualified Duckling.TimeGrain.Types as TG
  
  ruleExactlyDuration :: Rule
  ruleExactlyDuration = Rule
    { name = "exactly <duration>"
    , pattern =
      [ regex "to(c|č)no"
      , dimension Duration
      ]
    , prod = \tokens -> case tokens of
        (_:token:_) -> Just token
        _ -> Nothing
    }
  
  ruleIntegerAndAnHalfHours :: Rule
  ruleIntegerAndAnHalfHours = Rule
    { name = "<integer> and an half hours"
    , pattern =
      [ Predicate isNatural
      , regex "i pol?a?"
      ]
    , prod = \tokens -> case tokens of
        (Token Numeral NumeralData{TNumeral.value = v}:_) ->
          Just . Token Duration . duration TG.Minute $ 30 + 60 * floor v
        _ -> Nothing
    }
  
  ruleIntegerMoreUnitofduration :: Rule
  ruleIntegerMoreUnitofduration = Rule
    { name = "<integer> more <unit-of-duration>"
    , pattern =
      [ Predicate isNatural
      , regex "vi(s|š)e|manje"
      , dimension TimeGrain
      ]
    , prod = \tokens -> case tokens of
        (Token Numeral NumeralData{TNumeral.value = v}:
         _:
         Token TimeGrain grain:_) ->
           Just . Token Duration . duration grain $ floor v
        _ -> Nothing
    }
  
  ruleQuarterOfAnHour :: Rule
  ruleQuarterOfAnHour = Rule
    { name = "quarter of an hour"
    , pattern =
      [ regex "((1/4|frtalj|kvarat|(c|č)etvrt)\\s?(h|sata)?)"
      ]
    , prod = \_ -> Just . Token Duration $ duration TG.Minute 15
    }
  
  ruleAboutDuration :: Rule
  ruleAboutDuration = Rule
    { name = "about <duration>"
    , pattern =
      [ regex "(oko|otprilike|odokativno)"
      , dimension Duration
      ]
    , prod = \tokens -> case tokens of
        (_:token:_) -> Just token
        _ -> Nothing
    }
  
  ruleNumbernumberHours :: Rule
  ruleNumbernumberHours = Rule
    { name = "number.number hours"
    , pattern =
      [ regex "(\\d+)\\.(\\d+)"
      , regex "sat(i|a)?"
      ]
    , prod = \tokens -> case tokens of
        (Token RegexMatch (GroupMatch (h:m:_)):_) -> do
          hh <- parseInteger h
          mnum <- parseInteger m
          let mden = 10 ^ Text.length m
          Just . Token Duration $ minutesFromHourMixedFraction hh mnum mden
        _ -> Nothing
    }
  
  ruleThreequartersOfAnHour :: Rule
  ruleThreequartersOfAnHour = Rule
    { name = "three-quarters of an hour"
    , pattern =
      [ regex "((3/4|tri-?frtalja|tri-?kvarat|tri-?(c|č)etvrt(ine)?)\\s?(h|sata)?)"
      ]
    , prod = \_ -> Just . Token Duration $ duration TG.Minute 45
    }
  
  ruleHalfAnHour :: Rule
  ruleHalfAnHour = Rule
    { name = "half an hour"
    , pattern =
      [ regex "(1/2\\s?(h|sata)?|pol?a? sata)"
      ]
    , prod = \_ -> Just . Token Duration $ duration TG.Minute 30
    }
  
  rules :: [Rule]
  rules =
    [ ruleAboutDuration
    , ruleExactlyDuration
    , ruleHalfAnHour
    , ruleIntegerAndAnHalfHours
    , ruleIntegerMoreUnitofduration
    , ruleNumbernumberHours
    , ruleQuarterOfAnHour
    , ruleThreequartersOfAnHour
    ]
  