-- 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.AmountOfMoney.BG.Rules
  ( rules
  ) where

import Data.Maybe
import Data.String
import Prelude

import Duckling.AmountOfMoney.Helpers
import Duckling.AmountOfMoney.Types (Currency(..), AmountOfMoneyData (..))
import Duckling.Dimensions.Types
import Duckling.Numeral.Helpers (isNatural, isPositive)
import Duckling.Numeral.Types (NumeralData (..))
import Duckling.Types
import qualified Duckling.AmountOfMoney.Types as TAmountOfMoney
import qualified Duckling.Numeral.Types as TNumeral

ruleUnitAmount :: Rule
ruleUnitAmount = Rule
  { name = "<unit> <amount>"
  , pattern =
    [ Predicate isCurrencyOnly
    , Predicate isPositive
    ]
  , prod = \case
      (Token AmountOfMoney AmountOfMoneyData{TAmountOfMoney.currency = c}:
       Token Numeral NumeralData{TNumeral.value = v}:
       _) -> Just . Token AmountOfMoney . withValue v $ currencyOnly c
      _ -> Nothing
  }

ruleBGN :: Rule
ruleBGN = Rule
  { name = "лв"
  , pattern =
    [ regex "ле?ва?"
    ]
  , prod = \_ -> Just . Token AmountOfMoney $ currencyOnly BGN
  }

rulePounds :: Rule
rulePounds = Rule
  { name = "£"
  , pattern =
    [ regex "паунд(а|и)?"
    ]
  , prod = \_ -> Just . Token AmountOfMoney $ currencyOnly Pound
  }

ruleDollar :: Rule
ruleDollar = Rule
  { name = "$"
  , pattern =
    [ regex "долар(а|и)?"
    ]
  , prod = \_ -> Just . Token AmountOfMoney $ currencyOnly Dollar
  }

ruleCent :: Rule
ruleCent = Rule
  { name = "cent"
  , pattern =
    [ regex "ст(отинк(a|и))?|цента?|пени(та)?|пенса?|ц"
    ]
  , prod = \_ -> Just . Token AmountOfMoney $ currencyOnly Cent
  }

ruleEUR :: Rule
ruleEUR = Rule
  { name = "€"
  , pattern =
    [ regex "евр(о|а)"
    ]
  , prod = \_ -> Just . Token AmountOfMoney $ currencyOnly EUR
  }

ruleIntersectAndXCents :: Rule
ruleIntersectAndXCents = Rule
  { name = "intersect (and X cents)"
  , pattern =
    [ Predicate isWithoutCents
    , regex "и"
    , Predicate isCents
    ]
  , prod = \tokens -> case tokens of
      (Token AmountOfMoney fd:
       _:
       Token AmountOfMoney AmountOfMoneyData{TAmountOfMoney.value = Just c}:
       _) -> Just . Token AmountOfMoney $ withCents c fd
      _ -> Nothing
  }

ruleIntersect :: Rule
ruleIntersect = Rule
  { name = "intersect"
  , pattern =
    [ Predicate isWithoutCents
    , Predicate isNatural
    ]
  , prod = \tokens -> case tokens of
      (Token AmountOfMoney fd:
       Token Numeral NumeralData{TNumeral.value = c}:
       _) -> Just . Token AmountOfMoney $ withCents c fd
      _ -> Nothing
  }

ruleIntersectAndNumeral :: Rule
ruleIntersectAndNumeral = Rule
  { name = "intersect (and number)"
  , pattern =
    [ Predicate isWithoutCents
    , regex "и"
    , Predicate isNatural
    ]
  , prod = \tokens -> case tokens of
      (Token AmountOfMoney fd:
       _:
       Token Numeral NumeralData{TNumeral.value = c}:
       _) -> Just . Token AmountOfMoney $ withCents c fd
      _ -> Nothing
  }

ruleIntersectXCents :: Rule
ruleIntersectXCents = Rule
  { name = "intersect (X cents)"
  , pattern =
    [ Predicate isWithoutCents
    , Predicate isCents
    ]
  , prod = \tokens -> case tokens of
      (Token AmountOfMoney fd:
       Token AmountOfMoney AmountOfMoneyData{TAmountOfMoney.value = Just c}:
       _) -> Just . Token AmountOfMoney $ withCents c fd
      _ -> Nothing
  }

rulePrecision :: Rule
rulePrecision = Rule
  { name = "about|exactly <amount-of-money>"
  , pattern =
    [ regex "точно|около|приблизително|близо (до)?|почти"
    , Predicate isMoneyWithValue
    ]
  , prod = \tokens -> case tokens of
      (_:token:_) -> Just token
      _ -> Nothing
  }

ruleIntervalBetweenNumeral :: Rule
ruleIntervalBetweenNumeral = Rule
  { name = "between|from <numeral> to|and <amount-of-money>"
  , pattern =
    [ regex "между|от"
    , Predicate isPositive
    , regex "до|и"
    , Predicate isSimpleAmountOfMoney
    ]
  , prod = \tokens -> case tokens of
      (_:
       Token Numeral NumeralData{TNumeral.value = from}:
       _:
       Token AmountOfMoney AmountOfMoneyData{TAmountOfMoney.value = Just to,
                  TAmountOfMoney.currency = c}:
       _) | from < to ->
        Just . Token AmountOfMoney . withInterval (from, to) $ currencyOnly c
      _ -> Nothing
  }

ruleIntervalBetween :: Rule
ruleIntervalBetween = Rule
  { name = "between|from <amount-of-money> to|and <amount-of-money>"
  , pattern =
    [ regex "между|от"
    , Predicate isSimpleAmountOfMoney
    , regex "до|и"
    , Predicate isSimpleAmountOfMoney
    ]
  , prod = \tokens -> case tokens of
      (_:
       Token AmountOfMoney AmountOfMoneyData{TAmountOfMoney.value = Just from,
                  TAmountOfMoney.currency = c1}:
       _:
       Token AmountOfMoney AmountOfMoneyData{TAmountOfMoney.value = Just to,
                  TAmountOfMoney.currency = c2}:
       _) | from < to && c1 == c2 ->
        Just . Token AmountOfMoney . withInterval (from, to) $ currencyOnly c1
      _ -> Nothing
  }

ruleIntervalNumeralDash :: Rule
ruleIntervalNumeralDash = Rule
  { name = "<numeral> - <amount-of-money>"
  , pattern =
    [ Predicate isPositive
    , regex "-"
    , Predicate isSimpleAmountOfMoney
    ]
  , prod = \tokens -> case tokens of
      (Token Numeral NumeralData{TNumeral.value = from}:
       _:
       Token AmountOfMoney AmountOfMoneyData{TAmountOfMoney.value = Just to,
                  TAmountOfMoney.currency = c}:
       _) | from < to ->
         Just . Token AmountOfMoney . withInterval (from, to) $ currencyOnly c
      _ -> Nothing
  }

ruleIntervalDash :: Rule
ruleIntervalDash = Rule
  { name = "<amount-of-money> - <amount-of-money>"
  , pattern =
    [ Predicate isSimpleAmountOfMoney
    , regex "-"
    , Predicate isSimpleAmountOfMoney
    ]
  , prod = \tokens -> case tokens of
      (Token AmountOfMoney AmountOfMoneyData{TAmountOfMoney.value = Just from,
                  TAmountOfMoney.currency = c1}:
       _:
       Token AmountOfMoney AmountOfMoneyData{TAmountOfMoney.value = Just to,
                  TAmountOfMoney.currency = c2}:
       _) | from < to && c1 == c2 ->
        Just . Token AmountOfMoney . withInterval (from, to) $ currencyOnly c1
      _ -> Nothing
  }

ruleIntervalMax :: Rule
ruleIntervalMax = Rule
  { name = "under/less/lower/no more than <amount-of-money>"
  , pattern =
    [ regex "под|по-малко от|не повече от"
    , Predicate isSimpleAmountOfMoney
    ]
  , prod = \tokens -> case tokens of
      (_:
       Token AmountOfMoney AmountOfMoneyData{TAmountOfMoney.value = Just to,
                  TAmountOfMoney.currency = c}:
       _) -> Just . Token AmountOfMoney . withMax to $ currencyOnly c
      _ -> Nothing
  }

ruleIntervalMin :: Rule
ruleIntervalMin = Rule
  { name = "over/above/at least/more than <amount-of-money>"
  , pattern =
    [ regex "над|поне|повече от"
    , Predicate isSimpleAmountOfMoney
    ]
  , prod = \tokens -> case tokens of
      (_:
       Token AmountOfMoney AmountOfMoneyData{TAmountOfMoney.value = Just to,
                  TAmountOfMoney.currency = c}:
       _) -> Just . Token AmountOfMoney . withMin to $ currencyOnly c
      _ -> Nothing
  }

rules :: [Rule]
rules =
  [ ruleUnitAmount
  , ruleBGN
  , ruleDollar
  , ruleCent
  , ruleEUR
  , ruleIntersect
  , ruleIntersectAndNumeral
  , ruleIntersectAndXCents
  , ruleIntersectXCents
  , ruleIntervalBetweenNumeral
  , ruleIntervalBetween
  , ruleIntervalMax
  , ruleIntervalMin
  , ruleIntervalNumeralDash
  , ruleIntervalDash
  , rulePounds
  , rulePrecision
  ]