-- 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.Numeral.ZH.Rules
  ( rules
  ) where

import Data.Maybe
import Data.String
import Prelude
import qualified Data.HashMap.Strict as HashMap
import qualified Data.Text as Text

import Duckling.Dimensions.Types
import Duckling.Numeral.Helpers
import Duckling.Numeral.Types (NumeralData (..))
import Duckling.Regex.Types
import Duckling.Types
import qualified Duckling.Numeral.Types as TNumeral

ruleInteger5 :: Rule
ruleInteger5 = Rule
  { name = "integer (0..10)"
  , pattern =
    [ regex "(〇|零|一|二|两|兩|三|四|五|六|七|八|九|十)(个|個)?"
    ]
  , prod = \tokens -> case tokens of
      (Token RegexMatch (GroupMatch (match:_)):_) ->
        HashMap.lookup match integerMap >>= integer
      _ -> Nothing
  }

integerMap :: HashMap.HashMap Text.Text Integer
integerMap = HashMap.fromList
  [ ( "〇", 0 )
  , ( "零", 0 )
  , ( "一", 1 )
  , ( "兩", 2 )
  , ( "两", 2 )
  , ( "二", 2 )
  , ( "三", 3 )
  , ( "四", 4 )
  , ( "五", 5 )
  , ( "六", 6 )
  , ( "七", 7 )
  , ( "八", 8 )
  , ( "九", 9 )
  , ( "十", 10 )
  ]


ruleNumeralsPrefixWithNegativeOrMinus :: Rule
ruleNumeralsPrefixWithNegativeOrMinus = Rule
  { name = "numbers prefix with -, negative or minus"
  , pattern =
    [ regex "-|负|負"
    , Predicate isPositive
    ]
  , prod = \tokens -> case tokens of
      (_:Token Numeral nd:_) -> double (TNumeral.value nd * (-1))
      _ -> Nothing
  }

ruleDecimalWithThousandsSeparator :: Rule
ruleDecimalWithThousandsSeparator = Rule
  { name = "decimal with thousands separator"
  , pattern =
    [ regex "(\\d+(,\\d\\d\\d)+\\.\\d+)"
    ]
  , prod = \tokens -> case tokens of
      (Token RegexMatch (GroupMatch (match:_)):_) ->
        parseDouble (Text.replace "," Text.empty match) >>= double
      _ -> Nothing
  }

ruleDecimalNumeral :: Rule
ruleDecimalNumeral = Rule
  { name = "decimal number"
  , pattern =
    [ regex "(\\d*\\.\\d+)"
    ]
  , prod = \tokens -> case tokens of
      (Token RegexMatch (GroupMatch (match:_)):_) -> parseDecimal True match
      _ -> Nothing
  }

ruleNumeral :: Rule
ruleNumeral = Rule
  { name = "<number>个"
  , pattern =
    [ dimension Numeral
    , regex "个"
    ]
  , prod = \tokens -> case tokens of
      (token:_) -> Just token
      _ -> Nothing
  }

ruleInteger3 :: Rule
ruleInteger3 = Rule
  { name = "integer (20..90)"
  , pattern =
    [ numberBetween 2 10
    , regex "十"
    ]
  , prod = \tokens -> case tokens of
      (Token Numeral NumeralData{TNumeral.value = v}:_) -> double $ v * 10
      _ -> Nothing
  }

ruleNumeralsSuffixesKMG :: Rule
ruleNumeralsSuffixesKMG = Rule
  { name = "numbers suffixes (K, M, G)"
  , pattern =
    [ dimension Numeral
    , regex "([kmg])"
    ]
  , prod = \tokens -> case tokens of
      (Token Numeral NumeralData{TNumeral.value = v}:
       Token RegexMatch (GroupMatch (match:_)):
       _) -> case Text.toLower match of
         "k" -> double $ v * 1e3
         "m" -> double $ v * 1e6
         "g" -> double $ v * 1e9
         _   -> Nothing
      _ -> Nothing
  }

ruleInteger4 :: Rule
ruleInteger4 = Rule
  { name = "integer 21..99"
  , pattern =
    [ oneOf [70, 20, 60, 50, 40, 90, 30, 80]
    , numberBetween 1 10
    ]
  , prod = \tokens -> case tokens of
      (Token Numeral NumeralData{TNumeral.value = v1}:
       Token Numeral NumeralData{TNumeral.value = v2}:
       _) -> double $ v1 + v2
      _ -> Nothing
  }

ruleInteger2 :: Rule
ruleInteger2 = Rule
  { name = "integer (11..19)"
  , pattern =
    [ regex "十"
    , numberBetween 1 10
    ]
  , prod = \tokens -> case tokens of
      (_:Token Numeral NumeralData{TNumeral.value = v}:_) -> double $ 10 + v
      _ -> Nothing
  }

ruleIntegerWithThousandsSeparator :: Rule
ruleIntegerWithThousandsSeparator = Rule
  { name = "integer with thousands separator ,"
  , pattern =
    [ regex "(\\d{1,3}(,\\d\\d\\d){1,5})"
    ]
  , prod = \tokens -> case tokens of
      (Token RegexMatch (GroupMatch (match:_)):
       _) -> let fmt = Text.replace "," Text.empty match
        in parseDouble fmt >>= double
      _ -> Nothing
  }

rules :: [Rule]
rules =
  [ ruleDecimalNumeral
  , ruleDecimalWithThousandsSeparator
  , ruleInteger2
  , ruleInteger3
  , ruleInteger4
  , ruleInteger5
  , ruleIntegerWithThousandsSeparator
  , ruleNumeral
  , ruleNumeralsPrefixWithNegativeOrMinus
  , ruleNumeralsSuffixesKMG
  ]