-- 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 NoRebindableSyntax #-}
{-# LANGUAGE OverloadedStrings #-}

module Duckling.Time.EN.NZ.Rules
  ( rules
  ) where

import Data.Maybe
import Prelude

import Duckling.Dimensions.Types
import Duckling.Numeral.Helpers (parseInt)
import Duckling.Regex.Types
import Duckling.Time.Computed (easterSunday)
import Duckling.Time.Helpers
import Duckling.Time.Types (TimeData (..))
import Duckling.Types
import qualified Duckling.TimeGrain.Types as TG

ruleDDMM :: Rule
ruleDDMM = Rule
  { name = "dd/mm"
  , pattern =
    [ regex "(3[01]|[12]\\d|0?[1-9])\\s?[/-]\\s?(1[0-2]|0?[1-9])"
    ]
  , prod = \tokens -> case tokens of
      (Token RegexMatch (GroupMatch (dd:mm:_)):_) -> do
        d <- parseInt dd
        m <- parseInt mm
        tt $ monthDay m d
      _ -> Nothing
  }

ruleDDMMYYYY :: Rule
ruleDDMMYYYY = Rule
  { name = "dd/mm/yyyy"
  , pattern =
    [ regex "(3[01]|[12]\\d|0?[1-9])[-/\\s](1[0-2]|0?[1-9])[-/\\s](\\d{2,4})"
    ]
  , prod = \tokens -> case tokens of
      (Token RegexMatch (GroupMatch (dd:mm:yy:_)):_) -> do
        y <- parseInt yy
        d <- parseInt dd
        m <- parseInt mm
        tt $ yearMonthDay y m d
      _ -> Nothing
  }

-- Clashes with HHMMSS, hence only 4-digit years
ruleDDMMYYYYDot :: Rule
ruleDDMMYYYYDot = Rule
  { name = "dd.mm.yyyy"
  , pattern =
    [ regex "(3[01]|[12]\\d|0?[1-9])\\.(1[0-2]|0?[1-9])\\.(\\d{4})"
    ]
  , prod = \tokens -> case tokens of
      (Token RegexMatch (GroupMatch (dd:mm:yy:_)):_) -> do
        y <- parseInt yy
        d <- parseInt dd
        m <- parseInt mm
        tt $ yearMonthDay y m d
      _ -> Nothing
  }

rulePeriodicHolidays :: [Rule]
rulePeriodicHolidays = mkRuleHolidays
  -- Fixed dates, year over year
  [ ( "ANZAC Day", "anzac day", monthDay 4 25 )
  , ( "Guy Fawkes Night", "guy fawkes night", monthDay 11 5 )
  , ( "Waitangi Day", "waitangi day", monthDay 2 6 )

  -- Fixed day/week/month, year over year
  , ( "Administrative Professionals' Day"
    , "(administrative professional|secretarie|admin)('?s'?)? day"
    , nthDOWOfMonth 3 3 4 )
  , ( "Father's Day", "father'?s?'? day", nthDOWOfMonth 1 7 9 )
  , ( "Labour Day", "labour day", nthDOWOfMonth 4 1 10 )
  , ( "Mother's Day", "mother'?s?'? day", nthDOWOfMonth 2 7 5 )
  , ( "Queen's birthday", "queen's birthday", nthDOWOfMonth 1 1 6 )
  , ( "Thanksgiving Day", "thanks?giving( day)?", nthDOWOfMonth 4 4 11 )
  ]

ruleComputedHolidays :: [Rule]
ruleComputedHolidays = mkRuleHolidays
  [ ( "Easter Tuesday", "easter\\s+tue(sday)?"
    , cycleNthAfter False TG.Day 2 easterSunday )
  ]

rules :: [Rule]
rules =
  [ ruleDDMM
  , ruleDDMMYYYY
  , ruleDDMMYYYYDot
  ]
  ++ ruleComputedHolidays
  ++ rulePeriodicHolidays