{-|
Module      : Gargantext.Database.Root
Description : Main requests to get root of users
Copyright   : (c) CNRS, 2017-Present
License     : AGPL + CECILL v3
Maintainer  : team@gargantext.org
Stability   : experimental
Portability : POSIX
-}

{-# OPTIONS_GHC -fno-warn-name-shadowing #-}
{-# OPTIONS_GHC -fno-warn-orphans        #-}

{-# LANGUAGE Arrows                 #-}
{-# LANGUAGE DeriveGeneric          #-}
{-# LANGUAGE ConstraintKinds        #-}
{-# LANGUAGE FlexibleContexts       #-}
{-# LANGUAGE FlexibleInstances      #-}
{-# LANGUAGE FunctionalDependencies #-}
{-# LANGUAGE GeneralizedNewtypeDeriving #-}
{-# LANGUAGE OverloadedStrings #-}
{-# LANGUAGE MultiParamTypeClasses  #-}
{-# LANGUAGE NoImplicitPrelude      #-}
{-# LANGUAGE TemplateHaskell        #-}

module Gargantext.Database.Root where

import Database.PostgreSQL.Simple (Connection)
import Opaleye (restrict, (.==), Query, runQuery)
import Opaleye.PGTypes (pgStrictText, pgInt4)
import Control.Arrow (returnA)
import Gargantext.Prelude
import Gargantext.Database.Types.Node (Node, NodePoly(..), NodeType(NodeUser), HyperdataUser)
import Gargantext.Database.Queries (NodeRead)
import Gargantext.Database.Node (queryNodeTable)
import Gargantext.Database.User (queryUserTable, UserPoly(..))
import Gargantext.Database.Config (nodeTypeId)
import Gargantext.Core.Types.Individu (Username)
import Gargantext.Database.Node (Cmd(..), mkCmd)

getRootCmd :: Username -> Cmd [Node HyperdataUser]
getRootCmd u = mkCmd $ \c -> getRoot u c

getRoot :: Username -> Connection -> IO [Node HyperdataUser]
getRoot uname conn = runQuery conn (selectRoot uname)

selectRoot :: Username -> Query NodeRead
selectRoot username = proc () -> do
    row   <- queryNodeTable -< ()
    users <- queryUserTable -< ()
    restrict -< _node_typename   row .== (pgInt4 $ nodeTypeId NodeUser)
    restrict -< user_username  users .== (pgStrictText username)
    restrict -< _node_userId    row .== (user_id users)
    returnA  -< row