{- git-annex assistant webapp form utilities
 -
 - Copyright 2012 Joey Hess <joey@kitenet.net>
 -
 - Licensed under the GNU AGPL version 3 or higher.
 -}

{-# LANGUAGE FlexibleContexts, TypeFamilies, QuasiQuotes, MultiParamTypeClasses, TemplateHaskell, OverloadedStrings, RankNTypes #-}

module Assistant.WebApp.Form where

import Yesod hiding (textField, passwordField)
import Yesod.Form.Fields as F
import Data.Text (Text)

{- Yesod's textField sets the required attribute for required fields.
 - We don't want this, because many of the forms used in this webapp 
 - display a modal dialog when submitted, which interacts badly with
 - required field handling by the browser.
 -
 - Required fields are still checked by Yesod.
 -}
textField :: RenderMessage master FormMessage => Field sub master Text
textField = F.textField
	{ fieldView = \theId name attrs val _isReq -> [whamlet|
<input id="#{theId}" name="#{name}" *{attrs} type="text" value="#{either id id val}">
|]
	}

{- Also without required attribute. -}
passwordField :: RenderMessage master FormMessage => Field sub master Text
passwordField = F.passwordField
	{ fieldView = \theId name attrs val _isReq -> toWidget [hamlet|
<input id="#{theId}" name="#{name}" *{attrs} type="password" value="#{either id id val}">
|]
	}

{- Makes a note widget be displayed after a field. -}
withNote :: RenderMessage master FormMessage => Field sub master a -> GWidget sub master () -> Field sub master a
withNote field note = field { fieldView = newview }
  where
	newview theId name attrs val isReq = 
		let fieldwidget = (fieldView field) theId name attrs val isReq
		in [whamlet|^{fieldwidget}&nbsp;&nbsp;<span>^{note}</span>|]