{-# LANGUAGE NoImplicitPrelude   #-}
{-# LANGUAGE OverloadedStrings   #-}
{-# LANGUAGE PackageImports      #-}
{-# LANGUAGE ScopedTypeVariables #-}
{-# LANGUAGE UnicodeSyntax       #-}

{-|
[@ISO639-1@]        nl

[@ISO639-2B@]       dut

[@ISO639-3@]        nld

[@Native name@]     Nederlands

[@English name@]    Dutch
-}

module Text.Numeral.Language.NL
    ( -- * Language entry
      entry
      -- * Conversions
    , cardinal
    , ordinal
    , partitive
    , multiplicative
      -- * Structure
    , struct
      -- * Bounds
    , bounds
    ) where


--------------------------------------------------------------------------------
-- Imports
--------------------------------------------------------------------------------

import "base" Control.Monad ( return )
import "base" Data.Bool     ( Bool, otherwise )
import "base" Data.Function ( ($), const, fix )
import "base" Data.Functor  ( fmap )
import "base" Data.Maybe    ( Maybe(Just) )
import "base" Data.Ord      ( (<) )
import "base" Prelude       ( Integral, (-), negate )
import "base-unicode-symbols" Data.Bool.Unicode     ( (), () )
import "base-unicode-symbols" Data.Function.Unicode ( () )
import "base-unicode-symbols" Data.List.Unicode     ( () )
import "base-unicode-symbols" Data.Monoid.Unicode   ( () )
import qualified "containers" Data.Map as M ( fromList, lookup )
import           "this" Text.Numeral
import qualified "this" Text.Numeral.BigNum  as BN
import qualified "this" Text.Numeral.Exp     as E
import qualified "this" Text.Numeral.Grammar as G
import           "this" Text.Numeral.Misc ( dec )
import "this" Text.Numeral.Entry
import "text" Data.Text ( Text )


--------------------------------------------------------------------------------
-- NL
--------------------------------------------------------------------------------

entry  Entry
entry = emptyEntry
    { entIso639_1       = Just "nl"
    , entIso639_2       = ["dut"]
    , entIso639_3       = Just "nld"
    , entNativeNames    = ["Nederlands"]
    , entEnglishName    = Just "Dutch"
    , entCardinal       = Just Conversion
                          { toNumeral   = cardinal
                          , toStructure = struct
                          }
    , entOrdinal        = Just Conversion
                          { toNumeral   = ordinal
                          , toStructure = struct
                          }
    , entPartitive      = Just Conversion
                          { toNumeral   = partitive
                          , toStructure = \(n, d)  E.frac (struct n) (struct d)
                          }
    , entMultiplicative = Just Conversion
                          { toNumeral   = multiplicative
                          , toStructure = struct
                          }
    }

cardinal  (G.Plural i, G.Dative i, Integral α, E.Scale α)  i  α  Maybe Text
cardinal inf = cardinalRepr inf  struct

ordinal  (Integral α, E.Scale α)  i  α  Maybe Text
ordinal inf = ordinalRepr "eerste" inf  struct

partitive  ( G.Singular i, G.Plural i, G.NoCase i, G.Dative i
            , Integral α, E.Scale α
            )
           i  (α, α)  Maybe Text
partitive inf (n, d) = do
  n'  cardinal (G.noCase $ G.singular inf) n
  d'  ordinalRepr "éénde" inf $ struct d
  return $ n'  " "  d'

multiplicative  ( G.Singular i, G.Plural i, G.NoCase i, G.Dative i
                 , Integral α, E.Scale α
                 )
                i  α  Maybe Text
multiplicative inf = fmap ( "maal")  cardinal (G.noCase $ G.singular inf)

struct  ( Integral α, E.Scale α
         , E.Unknown β, E.Lit β, E.Neg β, E.Add β, E.Mul β, E.Scale β
         )
        α  β
struct = pos
       $ fix
       $ findRule (   0, lit               )
                [ (  13, add    10      L  )
                , (  20, mul    10      L L)
                , ( 100, step  100   10 R L)
                , (1000, step 1000 1000 R L)
                ]
                  (dec 6 - 1)
         `combine` pelletierScale R L BN.rule

bounds  (Integral α)  (α, α)
bounds = let x = dec 60000 - 1 in (negate x, x)

genericRepr  Repr i
genericRepr = defaultRepr
               { reprAdd   = Just ()
               , reprMul   = Just $ \_ _ _  ""
               , reprNeg   = Just $ \_ _    "min "
               }
    where
      (_      Lit 10) _         = ""
      (Lit n  _) _ | n  [2,3]  = "ën"
                    | n < 10     = "en"
                    | otherwise  = ""
      (_      _) _              = ""

cardinalRepr   i. (G.Plural i, G.Dative i)  i  Exp i  Maybe Text
cardinalRepr = render genericRepr
               { reprValue = \inf n  M.lookup n (syms inf)
               , reprScale = BN.pelletierRepr (\i c  if doPlural i c then "iljoenen" else "iljoen")
                                              (\i c  if doPlural i c then "iljarden" else "iljard")
                                              []
               }
    where
      doPlural  i  Ctx (Exp i)  Bool
      doPlural inf ctx = (G.isPlural inf  G.isDative inf)  isOutside R ctx

      syms inf =
          M.fromList
          [ (0, const "nul")
          , (1, pluralDative "één" "éénen" "éénen")
          , (2, forms "twee" "twin" "tweeën" "tweeën")
          , (3, forms "drie" "der"  "drieën" "drieën")
          , (4, forms "vier" "veer" "vieren" "vieren")
          , (5, pluralDative "vijf"  "vijven" "vijven")
          , (6, pluralDative "zes"   "zessen" "zessen")
          , (7, pluralDative "zeven" "zevens" "zevenen")
          , (8, \c  case c of
                       CtxMul _ (Lit 10) _  "tach"
                       CtxAdd _ (Lit 10) _  "ach"
                       _ | dativeForm c
                          pluralForm c     "achten"
                         | otherwise        "acht"
            )
          , (9, pluralDative "negen" "negens" "negenen")
          , (10, \c  case c of
                        CtxAdd R _ _
                          | dativeForm c  "tienen"
                          | pluralForm c  "tiens"
                        CtxMul R _ _
                          | dativeForm c  "tigen"
                          | pluralForm c  "tigs"
                          | otherwise     "tig"
                        _ | dativeForm c
                           pluralForm c  "tienen"
                          | otherwise     "tien"
            )
          , (  11, pluralDative "elf"     "elven"     "elven")
          , (  12, pluralDative "twaalf"  "twaalven"  "twaalven")
          , ( 100, pluralDative "honderd" "honderden" "honderden")
          , (1000, pluralDative "duizend" "duizenden" "duizenden")
          ]
          where
            pluralDative  s  s  s  Ctx (Exp i)  s
            pluralDative  o p d ctx
                | pluralForm ctx = p
                | dativeForm ctx = d
                | otherwise      = o

            dativeForm  Ctx (Exp i)  Bool
            dativeForm ctx = G.isDative inf  isOutside R ctx

            pluralForm  Ctx (Exp i)  Bool
            pluralForm ctx = G.isPlural inf  isOutside R ctx

            forms  s -- ^ Normal form.
                   s -- ^ Added to, or multiplied with ten.
                   s -- ^ Plural form.
                   s -- ^ Dative form.
                   Ctx (Exp i)
                   s
            forms n t p d ctx =
                case ctx of
                  CtxMul _ (Lit 10) _  t
                  CtxAdd _ (Lit 10) _  t
                  _ | dativeForm ctx   d
                    | pluralForm ctx   p
                    | otherwise        n

ordinalRepr  Text  i  Exp i  Maybe Text
ordinalRepr one =
    render genericRepr
           { reprValue = \_ n  M.lookup n syms
           , reprScale = BN.pelletierRepr ( BN.ordQuantityName "iljoen" "iljoenste"
                                                               "iljoen" "iljoenste"
                                          )
                                          ( BN.ordQuantityName "iljard" "iljardste"
                                                               "iljard" "iljardste"
                                          )
                                          []
           }
    where
      syms =
          M.fromList
          [ (0, const "nulde")
          , (1, \c  case c of
                       CtxEmpty           one
                       _ | isOutside R c  "éénde"
                         | otherwise      "één"
            )
          , (2, forms "tweede"  "twee"  "twin")
          , (3, forms "derde"   "drie"  "der")
          , (4, forms "vierde"  "vier"  "veer")
          , (5, forms "vijfde"  "vijf"  "vijf")
          , (6, forms "zesde"   "zes"   "zes")
          , (7, forms "zevende" "zeven" "zeven")
          , (8, \c  case c of
                       _ | isOutside R c  "achtste"
                       CtxMul _ (Lit 10) _  "tach"
                       CtxAdd _ (Lit _)  _  "ach"
                       _                    "acht"
            )
          , (9, forms "negende" "negen" "negen")
          , (10, \c  case c of
                        CtxMul R _ _ | isOutside R c  "tigste"
                                     | otherwise      "tig"
                        _            | isOutside R c  "tiende"
                                     | otherwise      "tien"
            )
          , (11, \c  if isOutside R c then "elfde"    else "elf")
          , (12, \c  if isOutside R c then "twaalfde" else "twaalf")
          , (100,  \c  if isOutside R c then "honderdste" else "honderd")
          , (1000, \c  if isOutside R c then "duizendste" else "duizend")
          ]

      forms  s -- ^ Ordinal form.
             s -- ^ Cardinal form.
             s -- ^ Added to, or multiplied with, ten.
             Ctx (Exp i)
             s
      forms o c t ctx = case ctx of
                          _ | isOutside R ctx  o
                          CtxMul _ (Lit 10) _  t
                          CtxAdd _ (Lit _)  _  t
                          _                    c