{-# LANGUAGE QuasiQuotes #-}
{-# LANGUAGE NoImplicitPrelude #-}
{-# LANGUAGE OverloadedStrings #-}
module TestImport
    ( module TestImport
    , module X
    ) where

import Application           (makeFoundation, makeLogWare)
import ClassyPrelude         as X hiding (delete, deleteBy, Handler)
import Database.Persist      as X hiding (get)
import Database.Persist.Sql  (SqlPersistM, SqlBackend, runSqlPersistMPool, rawExecute, rawSql, unSingle, connEscapeName)
import Foundation            as X
import Model                 as X
import Test.Hspec            as X
import Yesod.Default.Config2 (useEnv, loadYamlSettings)
import Yesod.Auth            as X
import Yesod.Test            as X
import Yesod.Core.Unsafe     (fakeHandlerGetLogger)

runDB :: SqlPersistM a -> YesodExample App a
runDB query = do
    app <- getTestYesod
    liftIO $ runDBWithApp app query

runDBWithApp :: App -> SqlPersistM a -> IO a
runDBWithApp app query = runSqlPersistMPool query (appConnPool app)

runHandler :: Handler a -> YesodExample App a
runHandler handler = do
    app <- getTestYesod
    fakeHandlerGetLogger appLogger app handler

withApp :: SpecWith (TestApp App) -> Spec
withApp = before $ do
    settings <- loadYamlSettings
        ["config/test-settings.yml", "config/settings.yml"]
        []
        useEnv
    foundation <- makeFoundation settings
    wipeDB foundation
    logWare <- liftIO $ makeLogWare foundation
    return (foundation, logWare)

-- This function will truncate all of the tables in your database.
-- 'withApp' calls it before each test, creating a clean environment for each
-- spec to run in.
wipeDB :: App -> IO ()
wipeDB app = runDBWithApp app $ do
    tables <- getTables
    sqlBackend <- ask
    let queries = map (\t -> "TRUNCATE TABLE " ++ connEscapeName sqlBackend (DBName t)) tables

    -- In MySQL, a table cannot be truncated if another table references it via foreign key.
    -- Since we're wiping both the parent and child tables, though, it's safe
    -- to temporarily disable this check.
    rawExecute "SET foreign_key_checks = 0;" []
    forM_ queries (\q -> rawExecute q [])
    rawExecute "SET foreign_key_checks = 1;" []

getTables :: MonadIO m => ReaderT SqlBackend m [Text]
getTables = do
    tables <- rawSql "SHOW TABLES;" []
    return $ map unSingle tables

-- | Authenticate as a user. This relies on the `auth-dummy-login: true` flag
-- being set in test-settings.yaml, which enables dummy authentication in
-- Foundation.hs
authenticateAs :: Entity User -> YesodExample App ()
authenticateAs (Entity _ u) = do
    request $ do
        setMethod "POST"
        addPostParam "ident" $ userIdent u
        setUrl $ AuthR $ PluginR "dummy" []

-- | Create a user.  The dummy email entry helps to confirm that foreign-key
-- checking is switched off in wipeDB for those database backends which need it.
createUser :: Text -> YesodExample App (Entity User)
createUser ident = runDB $ do
    user <- insertEntity User
        { userIdent = ident
        , userPassword = Nothing
        }
    _ <- insert Email
        { emailEmail = ident
        , emailUserId = Just $ entityKey user
        , emailVerkey = Nothing
        }
    return user