-- 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.DA.Rules
  ( rules ) where

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

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

ruleNumeralsPrefixWithNegativeOrMinus :: Rule
ruleNumeralsPrefixWithNegativeOrMinus = Rule
  { name = "numbers prefix with -, negative or minus"
  , pattern =
    [ regex "-|minus\\s?|negativ\\s?"
    , dimension Numeral
    ]
  , prod = \tokens -> case tokens of
      (_:Token Numeral (NumeralData {TNumeral.value = v}):_) ->
        double $ v * (-1)
      _ -> Nothing
  }

ruleIntegerNumeric :: Rule
ruleIntegerNumeric = Rule
  { name = "integer (numeric)"
  , pattern =
    [ regex "(\\d{1,18})"
    ]
  , prod = \tokens -> case tokens of
      (Token RegexMatch (GroupMatch (match:_)):_) -> do
        v <- parseInt match
        integer $ toInteger v
      _ -> Nothing
  }

ruleFew :: Rule
ruleFew = Rule
  { name = "few"
  , pattern =
    [ regex "(nogle )?få"
    ]
  , prod = \_ -> integer 3
  }

ruleTen :: Rule
ruleTen = Rule
  { name = "ten"
  , pattern =
    [ regex "ti"
    ]
  , prod = \_ -> integer 10 >>= withGrain 1
  }

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.singleton '.') 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 False match
      _ -> Nothing
  }

ruleInteger3 :: Rule
ruleInteger3 = Rule
  { name = "integer 21..99"
  , pattern =
    [ oneOf [20, 30 .. 90]
    , numberBetween 1 10
    ]
  , prod = \tokens -> case tokens of
      (Token Numeral (NumeralData {TNumeral.value = v1}):
       Token Numeral (NumeralData {TNumeral.value = v2}):
       _) -> double $ v1 + v2
      _ -> Nothing
  }

ruleSingle :: Rule
ruleSingle = Rule
  { name = "single"
  , pattern =
    [ regex "enkelt"
    ]
  , prod = \_ -> integer 1 >>= withGrain 1
  }

ruleIntersect :: Rule
ruleIntersect = Rule
  { name = "intersect"
  , pattern =
    [ numberWith (fromMaybe 0 . TNumeral.grain) (>1)
    , dimension Numeral
    ]
  , prod = \tokens -> case tokens of
      (Token Numeral (NumeralData {TNumeral.value = val1, TNumeral.grain = Just g}):
       Token Numeral (NumeralData {TNumeral.value = val2}):
       _) | (10 ** fromIntegral g) > val2 -> double $ val1 + val2
      _ -> Nothing
  }

ruleNumeralsSuffixesKMG :: Rule
ruleNumeralsSuffixesKMG = Rule
  { name = "numbers suffixes (K, M, G)"
  , pattern =
    [ dimension Numeral
    , regex "([kmg])(?=[\\W\\$€]|$)"
    ]
  , 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
  }

rulePowersOfTen :: Rule
rulePowersOfTen = Rule
  { name = "powers of tens"
  , pattern =
    [ regex "(hundrede?|tusinde?|million(er)?)"
    ]
  , prod = \tokens -> case tokens of
      (Token RegexMatch (GroupMatch (match:_)):_) -> case Text.toLower match of
        "hundred"   -> double 1e2 >>= withGrain 2 >>= withMultipliable
        "hundrede"  -> double 1e2 >>= withGrain 2 >>= withMultipliable
        "tusind"    -> double 1e3 >>= withGrain 3 >>= withMultipliable
        "tusinde"   -> double 1e3 >>= withGrain 3 >>= withMultipliable
        "million"   -> double 1e6 >>= withGrain 6 >>= withMultipliable
        "millioner" -> double 1e6 >>= withGrain 6 >>= withMultipliable
        _           -> Nothing
      _ -> Nothing
  }

ruleAPair :: Rule
ruleAPair = Rule
  { name = "a pair"
  , pattern =
    [ regex "et par"
    ]
  , prod = \_ -> integer 2 >>= withGrain 1
  }

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

ruleDozen :: Rule
ruleDozen = Rule
  { name = "dozen"
  , pattern =
    [ regex "dusin"
    ]
  , prod = \_ -> integer 12 >>= withGrain 1 >>= withMultipliable
  }

ruleMultiply :: Rule
ruleMultiply = Rule
  { name = "compose by multiplication"
  , pattern =
    [ dimension Numeral
    , numberWith TNumeral.multipliable id
    ]
  , prod = \tokens -> case tokens of
      (token1:token2:_) -> multiply token1 token2
      _ -> Nothing
  }

zeroNineteenMap :: HashMap Text Integer
zeroNineteenMap = HashMap.fromList
  [ ("ingen", 0)
  , ("nul", 0)
  , ("intet", 0)
  , ("en", 1)
  , ("et", 1)
  , ("én", 1)
  , ("ét", 1)
  , ("to", 2)
  , ("tre", 3)
  , ("fire", 4)
  , ("fem", 5)
  , ("seks", 6)
  , ("syv", 7)
  , ("otte", 8)
  , ("ni", 9)
  , ("ti", 10)
  , ("elleve", 11)
  , ("tolv", 12)
  , ("tretten", 13)
  , ("fjorten", 14)
  , ("femten", 15)
  , ("seksten", 16)
  , ("sytten", 17)
  , ("atten", 18)
  , ("nitten", 19)
  ]

ruleInteger :: Rule
ruleInteger = Rule
  { name = "integer (0..19)"
  , pattern =
    [ regex "(intet|ingen|nul|en|et|én|ét|to|tretten|tre|fire|femten|fem|seksten|seks|syv|otte|nitten|ni|ti|elleve|tolv|fjorten|sytten|atten)"
    ]
  , prod = \tokens -> case tokens of
      (Token RegexMatch (GroupMatch (match:_)):_) ->
        HashMap.lookup (Text.toLower match) zeroNineteenMap >>= integer
      _ -> Nothing
  }

ruleInteger2 :: Rule
ruleInteger2 = Rule
  { name = "integer (20..90)"
  , pattern =
    [ regex "(tyve|tredive|fyrre|halvtreds|tres|halvfjerds|firs|halvfems)"
    ]
  , prod = \tokens -> case tokens of
      (Token RegexMatch (GroupMatch (match:_)):_) -> case Text.toLower match of
        "tyve" -> integer 20
        "tredive" -> integer 30
        "fyrre" -> integer 40
        "halvtreds" -> integer 50
        "tres" -> integer 60
        "halvfjerds" -> integer 70
        "firs" -> integer 80
        "halvfems" -> integer 90
        _ -> Nothing
      _ -> Nothing
  }

ruleNumeralDotNumeral :: Rule
ruleNumeralDotNumeral = Rule
  { name = "number dot number"
  , pattern =
    [ dimension Numeral
    , regex "komma"
    , numberWith TNumeral.grain isNothing
    ]
  , prod = \tokens -> case tokens of
      (Token Numeral (NumeralData {TNumeral.value = v1}):
       _:
       Token Numeral (NumeralData {TNumeral.value = v2}):
       _) -> double $ v1 + decimalsToDouble v2
      _ -> 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:_)):_) ->
        parseDouble (Text.replace (Text.singleton '.') Text.empty match) >>= double
      _ -> Nothing
  }

rules :: [Rule]
rules =
  [ ruleAPair
  , ruleDecimalNumeral
  , ruleDecimalWithThousandsSeparator
  , ruleDozen
  , ruleFew
  , ruleInteger
  , ruleInteger2
  , ruleInteger3
  , ruleIntegerNumeric
  , ruleIntegerWithThousandsSeparator
  , ruleIntersect
  , ruleMultiply
  , ruleNumeralDotNumeral
  , ruleNumeralsOg
  , ruleNumeralsPrefixWithNegativeOrMinus
  , ruleNumeralsSuffixesKMG
  , rulePowersOfTen
  , ruleSingle
  , ruleTen
  ]