-- | The @node@ element of a OSM file.
module Geo.OSM.Node(
                     Node,
                     node
                   ) where

import Text.XML.HXT.Arrow
import Geo.OSM.NWRCommon
import Geo.OSM.Util
import Geo.OSM.Tag
import Geo.OSM.Accessor.Id
import Geo.OSM.Accessor.Tags
import Geo.OSM.Accessor.Changeset
import Geo.OSM.Accessor.Visible
import Geo.OSM.Accessor.User
import Geo.OSM.Accessor.Uid
import Geo.OSM.Accessor.Timestamp
import Geo.OSM.Accessor.Lat
import Geo.OSM.Accessor.Lon
import Prelude hiding (id)

-- | The @node@ element of a OSM file.
data Node = Node String String NWRCommon
  deriving Eq

instance XmlPickler Node where
  xpickle = xpElem "node" (xpWrap (\(lat', lon', nwr') -> Node lat' lon' nwr', \(Node lat' lon' nwr') -> (lat', lon', nwr'))
                             (xpTriple (xpAttr "lat" xpText) (xpAttr "lon" xpText) xpickle))

instance Show Node where
  show = showPickled []

instance Lat Node where
  lat (Node x _ _) = x

instance Lon Node where
  lon (Node _ x _) = x

instance Id Node where
  id (Node _ _ x) = id x

instance Tags Node where
  tags (Node _ _ x) = tags x

instance Changeset Node where
  changeset (Node _ _ x) = changeset x

instance Visible Node where
  visible (Node _ _ x) = visible x

instance User Node where
  user (Node _ _ x) = user x

instance Uid Node where
  uid (Node _ _ x) = uid x

instance Timestamp Node where
  timestamp (Node _ _ x) = timestamp x

-- | Constructs a node with a lat, lon, id, list of tags, changeset, visible, user&uid and timestamp.
node :: String -- ^ The @lat@ attribute.
        -> String -- ^ The @lon@ attribute.
        -> String -- ^ The @id@ attribute.
        -> [Tag] -- ^ The list of tags (@tag@ elements).
        -> Maybe String -- ^ The @changeset@ attribute.
        -> Bool -- ^ The @visible@ attribute.
        -> (Maybe String, Maybe String) -- ^ The @user@ and @uid@ attributes.
        -> Maybe String -- ^ The @timestamp@ attribute.
        -> Node
node = flip flip nwrCommon . (((.) . (.) . (.) . (.) . (.) . (.)) .) . Node