{-# LANGUAGE TemplateHaskell #-}
{-# LANGUAGE UndecidableInstances #-}
{-# LANGUAGE FlexibleInstances #-}
{-# LANGUAGE FlexibleContexts #-}
{-# LANGUAGE TypeFamilies #-}
{-# OPTIONS_GHC -fno-warn-warnings-deprecations #-}
module Yesod.Core
    ( -- * Type classes
      Yesod (..)
    , YesodDispatch (..)
    , YesodSubDispatch (..)
    , RenderRoute (..)
    , ParseRoute (..)
    , RouteAttrs (..)
      -- ** Breadcrumbs
    , YesodBreadcrumbs (..)
    , breadcrumbs
      -- * Types
    , Approot (..)
    , FileUpload (..)
    , ErrorResponse (..)
      -- * Utitlities
    , maybeAuthorized
    , widgetToPageContent
      -- * Defaults
    , defaultErrorHandler
      -- * Data types
    , AuthResult (..)
    , unauthorizedI
      -- * Logging
    , LogLevel (..)
    , logDebug
    , logInfo
    , logWarn
    , logError
    , logOther
    , logDebugS
    , logInfoS
    , logWarnS
    , logErrorS
    , logOtherS
      -- * Sessions
    , SessionBackend (..)
    , customizeSessionCookies
    , defaultClientSessionBackend
    , clientSessionBackend
    , clientSessionDateCacher
    , loadClientSession
    , Header(..)
    -- * JS loaders
    , ScriptLoadPosition (..)
    , BottomOfHeadAsync
      -- * Subsites
    , MonadHandler (..)
    , MonadWidget (..)
    , getRouteToParent
    , defaultLayoutSub
      -- * Misc
    , yesodVersion
    , yesodRender
    , runFakeHandler
      -- * LiteApp
    , module Yesod.Core.Internal.LiteApp
      -- * Low-level
    , yesodRunner
      -- * Re-exports
    , module Yesod.Core.Content
    , module Yesod.Core.Dispatch
    , module Yesod.Core.Handler
    , module Yesod.Core.Widget
    , module Yesod.Core.Json
    , module Text.Shakespeare.I18N
    , module Yesod.Core.Internal.Util
    , module Text.Blaze.Html
    , MonadTrans (..)
    , MonadIO (..)
    , MonadBase (..)
    , MonadBaseControl
    , MonadResource (..)
    , MonadLogger
      -- * Commonly referenced functions/datatypes
    , Application
      -- * Utilities
    , showIntegral
    , readIntegral
      -- * Shakespeare
      -- ** Hamlet
    , hamlet
    , shamlet
    , xhamlet
    , HtmlUrl
      -- ** Julius
    , julius
    , JavascriptUrl
    , renderJavascriptUrl
      -- ** Cassius/Lucius
    , cassius
    , lucius
    , CssUrl
    , renderCssUrl
    ) where

import Yesod.Core.Content
import Yesod.Core.Dispatch
import Yesod.Core.Handler
import Yesod.Core.Class.Handler
import Yesod.Core.Widget
import Yesod.Core.Json
import Yesod.Core.Types
import Text.Shakespeare.I18N
import Yesod.Core.Internal.Util (formatW3 , formatRFC1123 , formatRFC822)
import Text.Blaze.Html (Html, toHtml, preEscapedToMarkup)

import Control.Monad.Logger
import Control.Monad.Trans.Class (MonadTrans (..))
import Yesod.Core.Internal.Session
import Yesod.Core.Internal.Run (yesodRunner)
import Yesod.Core.Class.Yesod
import Yesod.Core.Class.Dispatch
import Yesod.Core.Class.Breadcrumbs
import Yesod.Core.Internal.Run (yesodRender, runFakeHandler)
import qualified Paths_yesod_core
import Data.Version (showVersion)
import Yesod.Routes.Class
import Control.Monad.IO.Class (MonadIO (..))
import Control.Monad.Base (MonadBase (..))
import Control.Monad.Trans.Control (MonadBaseControl (..))

import Control.Monad.Trans.Resource (MonadResource (..))
import Yesod.Core.Internal.LiteApp
import Text.Hamlet
import Text.Cassius
import Text.Lucius
import Text.Julius
import Network.Wai (Application)

-- | Return an 'Unauthorized' value, with the given i18n message.
unauthorizedI :: (MonadHandler m, RenderMessage (HandlerSite m) msg) => msg -> m AuthResult
unauthorizedI msg = do
    mr <- getMessageRender
    return $ Unauthorized $ mr msg

yesodVersion :: String
yesodVersion = showVersion Paths_yesod_core.version

-- | Return the same URL if the user is authorized to see it.
--
-- Built on top of 'isAuthorized'. This is useful for building page that only
-- contain links to pages the user is allowed to see.
maybeAuthorized :: Yesod site
                => Route site
                -> Bool -- ^ is this a write request?
                -> HandlerT site IO (Maybe (Route site))
maybeAuthorized r isWrite = do
    x <- isAuthorized r isWrite
    return $ if x == Authorized then Just r else Nothing

getRouteToParent :: Monad m => HandlerT child (HandlerT parent m) (Route child -> Route parent)
getRouteToParent = HandlerT $ return . handlerToParent

defaultLayoutSub :: Yesod parent
                 => WidgetT child IO ()
                 -> HandlerT child (HandlerT parent IO) Html
defaultLayoutSub cwidget = widgetToParentWidget cwidget >>= lift . defaultLayout

showIntegral :: Integral a => a -> String
showIntegral x = show (fromIntegral x :: Integer)

readIntegral :: Num a => String -> Maybe a
readIntegral s =
    case reads s of
        (i, _):_ -> Just $ fromInteger i
        [] -> Nothing
