module Foundation
    ( GitCab (..)
    , Route (..)
    , GitCabMessage (..)
    , resourcesGitCab
    , Handler
    , Widget
    , Form
    , maybeAuth
    , requireAuth
    , module Settings
    , module Model
    ) where

import Prelude
import Yesod
import Yesod.Static
import Yesod.Auth
import Yesod.Auth.BrowserId
import Yesod.Auth.GoogleEmail
import Yesod.Default.Config
import Yesod.Default.Util (addStaticContentExternal)
import Yesod.Logger (Logger, logMsg, formatLogText)
import Network.HTTP.Conduit (Manager)
#ifdef DEVELOPMENT
import Yesod.Logger (logLazyText)
#endif
import qualified Settings
import qualified Data.ByteString.Lazy as L
import qualified Database.Persist.Store
import Database.Persist.GenericSql
import Settings (widgetFile, Extra (..))
import Model
import Text.Jasmine (minifym)
import Text.Hamlet (hamletFile)
#if DEVELOPMENT
import qualified Data.Text.Lazy.Encoding
#else
import Network.Mail.Mime (sendmail)
#endif

-- | The site argument for your application. This can be a good place to
-- keep settings and values requiring initialization before your application
-- starts running, such as database connections. Every handler will have
-- access to the data present here.
data GitCab = GitCab
    { settings :: AppConfig DefaultEnv Extra
    , getLogger :: Logger
    , getStatic :: Static -- ^ Settings for static file serving.
    , connPool :: Database.Persist.Store.PersistConfigPool Settings.PersistConfig -- ^ Database connection pool.
    , httpManager :: Manager
    , persistConfig :: Settings.PersistConfig
    }

-- Set up i18n messages. See the message folder.
mkMessage "GitCab" "messages" "en"

-- This is where we define all of the routes in our application. For a full
-- explanation of the syntax, please see:
-- http://www.yesodweb.com/book/handler
--
-- This function does three things:
--
-- * Creates the route datatype GitCabRoute. Every valid URL in your
--   application can be represented as a value of this type.
-- * Creates the associated type:
--       type instance Route GitCab = GitCabRoute
-- * Creates the value resourcesGitCab which contains information on the
--   resources declared below. This is used in Handler.hs by the call to
--   mkYesodDispatch
--
-- What this function does *not* do is create a YesodSite instance for
-- GitCab. Creating that instance requires all of the handler functions
-- for our application to be in scope. However, the handler functions
-- usually require access to the GitCabRoute datatype. Therefore, we
-- split these actions into two functions and place them in separate files.
mkYesodData "GitCab" $(parseRoutesFile "config/routes")

type Form x = Html -> MForm GitCab GitCab (FormResult x, Widget)

-- Please see the documentation for the Yesod typeclass. There are a number
-- of settings which can be configured by overriding methods here.
instance Yesod GitCab where
    approot = ApprootMaster $ appRoot . settings

    defaultLayout widget = do
        master <- getYesod
        mmsg <- getMessage

        -- We break up the default layout into two components:
        -- default-layout is the contents of the body tag, and
        -- default-layout-wrapper is the entire page. Since the final
        -- value passed to hamletToRepHtml cannot be a widget, this allows
        -- you to use normal widget features in default-layout.

        pc <- widgetToPageContent $ do
            $(widgetFile "normalize")
            $(widgetFile "default-layout")
        hamletToRepHtml $(hamletFile "templates/default-layout-wrapper.hamlet")

    -- This is done to provide an optimization for serving static files from
    -- a separate domain. Please see the staticRoot setting in Settings.hs
    urlRenderOverride y (StaticR s) =
        Just $ uncurry (joinPath y (Settings.staticRoot $ settings y)) $ renderRoute s
    urlRenderOverride _ _ = Nothing

    -- The page to be redirected to when authentication is required.
    authRoute _ = Just $ AuthR LoginR

    messageLogger y loc level msg =
      formatLogText (getLogger y) loc level msg >>= logMsg (getLogger y)

    -- This function creates static content files in the static folder
    -- and names them based on a hash of their content. This allows
    -- expiration dates to be set far in the future without worry of
    -- users receiving stale content.
    addStaticContent = addStaticContentExternal minifym base64md5 Settings.staticDir (StaticR . flip StaticRoute [])

-- How to run database actions.
instance YesodPersist GitCab where
    type YesodPersistBackend GitCab = SqlPersist
    runDB f = do
        master <- getYesod
        Database.Persist.Store.runPool
            (persistConfig master)
            f
            (connPool master)

instance YesodAuth GitCab where
    type AuthId GitCab = UserId

    -- Where to send a user after successful login
    loginDest _ = RootR
    -- Where to send a user after logout
    logoutDest _ = RootR

    getAuthId creds = runDB $ do
        x <- getBy $ UniqueUser $ credsIdent creds
        case x of
            Just (Entity uid _) -> return $ Just uid
            Nothing -> do
                fmap Just $ insert $ User (credsIdent creds) Nothing

    -- You can add other plugins like BrowserID, email or OAuth here
    authPlugins _ = [authBrowserId, authGoogleEmail]

    authHttpManager = httpManager

-- Sends off your mail. Requires sendmail in production!
deliver :: GitCab -> L.ByteString -> IO ()
#ifdef DEVELOPMENT
deliver y = logLazyText (getLogger y) . Data.Text.Lazy.Encoding.decodeUtf8
#else
deliver _ = sendmail
#endif

-- This instance is required to use forms. You can modify renderMessage to
-- achieve customized and internationalized form validation messages.
instance RenderMessage GitCab FormMessage where
    renderMessage _ _ = defaultFormMessage
