-- 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. An additional grant
-- of patent rights can be found in the PATENTS file in the same directory.


{-# LANGUAGE GADTs #-}
{-# LANGUAGE OverloadedStrings #-}

module Duckling.Duration.HU.Rules
  ( rules ) where

import Control.Monad (join)
import Data.String
import Prelude
import qualified Data.Text as Text

import Duckling.Dimensions.Types
import Duckling.Duration.Helpers
import Duckling.Numeral.Helpers (parseInt, parseInteger)
import Duckling.Numeral.Types (NumeralData(..))
import Duckling.Regex.Types
import Duckling.Types
import qualified Duckling.Numeral.Types as TNumeral
import qualified Duckling.TimeGrain.Types as TG

ruleDurationQuarterOfAnHour :: Rule
ruleDurationQuarterOfAnHour = Rule
  { name = "quarter of an hour"
  , pattern =
    [ regex "(negyed[\\s-]?\x00F3ra)"
    ]
  , prod = \_ -> Just . Token Duration $ duration TG.Minute 15
  }

ruleDurationHalfAnHour :: Rule
ruleDurationHalfAnHour = Rule
  { name = "half an hour"
  , pattern =
    [ regex "(f\x00E9l[\\s-]?\x00F3ra)"
    ]
  , prod = \_ -> Just . Token Duration $ duration TG.Minute 30
  }

ruleDurationThreeQuartersOfAnHour :: Rule
ruleDurationThreeQuartersOfAnHour = Rule
  { name = "three-quarters of an hour"
  , pattern =
    [ regex "(3/4[\\s-]?óra|h\x00E1romnegyed[\\s-]?\x00F3ra)"
    ]
  , prod = \_ -> Just . Token Duration $ duration TG.Minute 45
  }

ruleDurationDotNumeralHours :: Rule
ruleDurationDotNumeralHours = Rule
  { name = "number.number hours"
  , pattern =
    [ regex "(\\d+)\\.(\\d+) óra"
    ]
  , 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
  }

ruleDurationAndHalfHour :: Rule
ruleDurationAndHalfHour = Rule
  { name = "<integer> and an half hour"
  , pattern =
    [ Predicate isNatural
    , regex "\x00E9s f\x00E9l[\\s-]?\x00F3ra"
    ]
  , prod = \tokens -> case tokens of
      (Token Numeral (NumeralData {TNumeral.value = v}):_) ->
        Just . Token Duration . duration TG.Minute $ 30 + 60 * floor v
      _ -> Nothing
  }

rules :: [Rule]
rules =
  [ ruleDurationQuarterOfAnHour
  , ruleDurationHalfAnHour
  , ruleDurationThreeQuartersOfAnHour
  , ruleDurationDotNumeralHours
  , ruleDurationAndHalfHour
  ]