-- 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.AR.Rules
  ( rules
  ) where

import Data.HashMap.Strict (HashMap)
import Data.Maybe
import Data.String
import Data.Text (Text)
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 4"
  , pattern =
    [ regex "([أا]ربع[ةه]?)"
    ]
  , prod = \_ -> integer 4
  }

ruleInteger23 :: Rule
ruleInteger23 = Rule
  { name = "integer 101..999"
  , pattern =
    [ oneOf [100, 200 .. 900]
    , regex "و"
    , numberBetween 1 100
    ]
  , prod = \tokens -> case tokens of
      (Token Numeral NumeralData{TNumeral.value = v1}:
       _:
       Token Numeral NumeralData{TNumeral.value = v2}:
       _) -> double $ v1 + v2
      _ -> Nothing
  }

ruleInteger18 :: Rule
ruleInteger18 = Rule
  { name = "integer 12"
  , pattern =
    [ regex "([إا]?ثن(ت)?[يىا] ?عشر[ةه]?)"
    ]
  , prod = \_ -> integer 12
  }

digitsMap :: HashMap Text Integer
digitsMap = HashMap.fromList
  [ ("عشر", 2)
  , ("ثلاث", 3)
  , ("اربع", 4)
  , ("أربع", 4)
  , ("خمس", 5)
  , ("ست", 6)
  , ("سبع", 7)
  , ("ثمان", 8)
  , ("تسع", 9)
  ]

ruleInteger19 :: Rule
ruleInteger19 = Rule
  { name = "integer (20..90)"
  , pattern =
    [ regex "(عشر|ثلاث|[أا]ربع|خمس|ست|سبع|ثمان|تسع)(ون|ين)"
    ]
  , prod = \tokens -> case tokens of
      Token RegexMatch (GroupMatch (match:_)):_ ->
        (* 10) <$> HashMap.lookup match digitsMap >>= integer
      _ -> Nothing
  }

ruleInteger200 :: Rule
ruleInteger200 = Rule
  { name = "integer (200)"
  , pattern =
    [ regex "مائتان|مائتين"
    ]
  , prod = const $ integer 200
  }

ruleInteger22 :: Rule
ruleInteger22 = Rule
  { name = "integer 21..99"
  , pattern =
    [ numberBetween 1 10
    , regex "و"
    , oneOf [20, 30 .. 90]
    ]
  , prod = \tokens -> case tokens of
      (Token Numeral NumeralData{TNumeral.value = v1}:
       _:
       Token Numeral NumeralData{TNumeral.value = v2}:
       _) -> double $ v1 + v2
      _ -> Nothing
  }

ruleInteger21 :: Rule
ruleInteger21 = Rule
  { name = "integer (13..19)"
  , pattern =
    [ numberBetween 3 10
    , numberWith TNumeral.value (== 10)
    ]
  , prod = \tokens -> case tokens of
      (Token Numeral NumeralData{TNumeral.value = v}:_) -> double $ v + 10
      _ -> 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
  }

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
  }

ruleInteger15 :: Rule
ruleInteger15 = Rule
  { name = "integer 11"
  , pattern =
    [ regex "([إاأ]حد[يى]? عشر[ةه]?)"
    ]
  , prod = \_ -> integer 11
  }

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

rulePowersOfTen :: Rule
rulePowersOfTen = Rule
  { name = "powers of tens"
  , pattern =
    [ regex "(ما?[ئي][ةه]|مئات|[أا]لف|ال??|[آا]لاف|ملايين)"
    ]
  , prod = \tokens -> case tokens of
      (Token RegexMatch (GroupMatch (match:_)):_) -> case Text.toLower match of
        "مئة" ->
          double 1e2 >>= withGrain 2 >>= withMultipliable
        "مئه" ->
          double 1e2 >>= withGrain 2 >>= withMultipliable
        "مائة" ->
          double 1e2 >>= withGrain 2 >>= withMultipliable
        "مائه" ->
          double 1e2 >>= withGrain 2 >>= withMultipliable
        "مئات" ->
          double 1e2 >>= withGrain 2 >>= withMultipliable
        "ألف" -> double 1e3 >>= withGrain 3 >>= withMultipliable
        "الف" -> double 1e3 >>= withGrain 3 >>= withMultipliable
        "الاف" ->
          double 1e3 >>= withGrain 3 >>= withMultipliable
        "آلاف" ->
          double 1e3 >>= withGrain 3 >>= withMultipliable
        "ملايي" ->
          double 1e6 >>= withGrain 6 >>= withMultipliable
        "ملايين" ->
          double 1e6 >>= withGrain 6 >>= withMultipliable
        _ -> Nothing
      _ -> Nothing
  }

ruleInteger3 :: Rule
ruleInteger3 = Rule
  { name = "integer 2"
  , pattern =
    [ regex "[إا]ثنت?[اي]ن"
    ]
  , prod = \_ -> integer 2
  }

ruleInteger13 :: Rule
ruleInteger13 = Rule
  { name = "integer 9"
  , pattern =
    [ regex "تسع[ةه]?"
    ]
  , prod = \_ -> integer 9
  }

ruleInteger12 :: Rule
ruleInteger12 = Rule
  { name = "integer 8"
  , pattern =
    [ regex "ثما??ني?[ةه]?"
    ]
  , prod = \_ -> integer 8
  }

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

ruleInteger7 :: Rule
ruleInteger7 = Rule
  { name = "integer 5"
  , pattern =
    [ regex "خمس[ةه]?"
    ]
  , prod = \_ -> integer 5
  }

ruleInteger14 :: Rule
ruleInteger14 = Rule
  { name = "integer 10"
  , pattern =
    [ regex "عشر[ةه]?"
    ]
  , prod = \_ -> integer 10
  }

ruleInteger9 :: Rule
ruleInteger9 = Rule
  { name = "integer 6"
  , pattern =
    [ regex "ست[ةه]?"
    ]
  , prod = \_ -> integer 6
  }

ruleInteger :: Rule
ruleInteger = Rule
  { name = "integer 0"
  , pattern =
    [ regex "صفر"
    ]
  , prod = \_ -> integer 0
  }

ruleInteger4 :: Rule
ruleInteger4 = Rule
  { name = "integer 3"
  , pattern =
    [ regex "(ثلاث[ةه]?)"
    ]
  , prod = \_ -> integer 3
  }

ruleInteger2 :: Rule
ruleInteger2 = Rule
  { name = "integer 1"
  , pattern =
    [ regex "واحد[ةه]?"
    ]
  , prod = \_ -> integer 1
  }

ruleInteger11 :: Rule
ruleInteger11 = Rule
  { name = "integer 7"
  , pattern =
    [ regex "سبع[ةه]?"
    ]
  , prod = \_ -> integer 7
  }

ruleNumeralDotNumeral :: Rule
ruleNumeralDotNumeral = Rule
  { name = "number dot number"
  , pattern =
    [ dimension Numeral
    , regex "فاصل[ةه]"
    , 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.empty match) >>= double
      _ -> Nothing
  }

rules :: [Rule]
rules =
  [ ruleDecimalNumeral
  , ruleDecimalWithThousandsSeparator
  , ruleInteger
  , ruleInteger11
  , ruleInteger12
  , ruleInteger13
  , ruleInteger14
  , ruleInteger15
  , ruleInteger18
  , ruleInteger19
  , ruleInteger2
  , ruleInteger21
  , ruleInteger22
  , ruleInteger23
  , ruleInteger3
  , ruleInteger4
  , ruleInteger5
  , ruleInteger7
  , ruleInteger9
  , ruleIntegerWithThousandsSeparator
  , ruleMultiply
  , ruleNumeralDotNumeral
  , ruleNumeralsPrefixWithMinus
  , rulePowersOfTen
  , ruleInteger200
  ]