{-# LANGUAGE OverloadedStrings, ScopedTypeVariables #-}
module UI.Search(engines) where

import Text.Blaze.Html5 as H
import Text.Blaze.Html5.Attributes as A
import Text.Blaze.Html
import Data.Text as Txt

import Data.UUID as ID

import Internal
import Messages

import Network.URI (parseAbsoluteURI)
import qualified Internal.Elements as Els
import qualified Text.XML.Cursor as XC
import qualified Text.XML as XML

import Control.Monad (mapM)
import qualified UI.Templates as Tpl

engines :: [(
    [Text] -> Html,
    String -> Session -> XC.Cursor -> IO [[Text] -> Html]
  )]
engines = [
    (const "URL", offerToLoad),
    (const "CSS", queryEls "css selector"),
    (flip l LinkSearchExact, queryEls "link text"), -- Only useful if it promotes results higher.
    (flip l LinkSearch, queryEls "partial link text"),
    (const "XPath", queryEls "xpath") -- FIXME parser infinite loops...
  ]

result href' = a ! href (stringValue href') ! target "preview"
disclosure = "⤷"

---

offerToLoad q _ _ | Just _ <- parseAbsoluteURI q = return [\langs -> do
        H.form ! action "nav/load" ! method "POST" $ do
            input ! type_ "hidden" ! name "url" ! value (stringValue q)
            result q $ string q
            button ! type_ "submit" ! A.title (l' langs DebugLink') $ disclosure
      ]
    | otherwise = return []

queryEls method q session root
    | Right ret <- Els.find (Els.Find method q) root = do
        Prelude.map formatEl <$> mapM (\el -> (,) el <$> registerEl session el) ret
    | otherwise = return []

formatEl (el, uuid) langs = result ("el/" ++ ID.toString uuid ++ "/preview") $ Tpl.xmlNode' $ XC.node el