$if(include_templates)${-# LANGUAGE MultiParamTypeClasses #-}$endif$
module $module$.Common where

import Control.Applicative
import Web.Simple
$if(include_templates)$import Web.Simple.Templates$endif$
$if(include_sessions)$import Web.Simple.Session$endif$
$if(include_postgresql)$import Web.Simple.PostgreSQL$endif$

data AppSettings = AppSettings { $if(include_postgresql)$appDB :: PostgreSQLConn$if(include_sessions)$
                               , appSession :: Maybe Session$endif$$else$$if(include_sessions)$appSession :: Maybe Session$endif$$endif$ }

newAppSettings :: IO AppSettings
newAppSettings = do
  $if(include_postgresql)$db <- createPostgreSQLConn$endif$
  return $$ AppSettings$if(include_postgresql)$ db$endif$$if(include_sessions)$ Nothing$endif$
$if(include_postgresql)$
instance HasPostgreSQL AppSettings where
  postgreSQLConn = appDB
$endif$$if(include_sessions)$
instance HasSession AppSettings where
  getSession = appSession
  setSession sess = do
    cs <- controllerState
    putState $$ cs { appSession = Just sess }
$endif$$if(include_templates)$
instance HasTemplates IO AppSettings where
  defaultLayout = Just <$$> getTemplate "layouts/main.html"
$endif$