{-|
Module      : Gargantext.Database.Query.Table.Node.Children
Description : Main requests of Node to the database
Copyright   : (c) CNRS, 2017-Present
License     : AGPL + CECILL v3
Maintainer  : team@gargantext.org
Stability   : experimental
Portability : POSIX
-}


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

{-# LANGUAGE Arrows                      #-}

module Gargantext.Database.Query.Table.Node.Children
  where

import Control.Arrow (returnA)
import Data.Proxy
import Gargantext.Core
import Gargantext.Core.Types
import Gargantext.Database.Admin.Types.Hyperdata (HyperdataDocument, HyperdataContact)
import Gargantext.Database.Prelude
import Gargantext.Database.Query.Filter

import Gargantext.Database.Schema.Node
import Gargantext.Database.Schema.Context
import Gargantext.Database.Schema.NodeContext
import Gargantext.Database.Query.Table.NodeContext


import Gargantext.Prelude
import Opaleye


-- TODO getAllTableDocuments
getAllDocuments :: HasDBid NodeType => ParentId -> Cmd err (TableResult (Node HyperdataDocument))
getAllDocuments pId = getAllChildren pId (Proxy :: Proxy HyperdataDocument)
                                         (Just NodeDocument)

-- TODO getAllTableContacts
getAllContacts :: HasDBid NodeType => ParentId -> Cmd err (TableResult (Node HyperdataContact))
getAllContacts pId = getAllChildren pId (Proxy :: Proxy HyperdataContact)
                                        (Just NodeContact)

getAllChildren :: (JSONB a, HasDBid NodeType)
               => ParentId
               -> proxy a
               -> Maybe NodeType
               -> Cmd err (NodeTableResult a)
getAllChildren pId p maybeNodeType = getChildren pId p maybeNodeType Nothing Nothing


getChildren :: (JSONB a, HasDBid NodeType)
            => ParentId
            -> proxy a
            -> Maybe NodeType
            -> Maybe Offset
            -> Maybe Limit
            -> Cmd err (NodeTableResult a)
getChildren pId p t@(Just NodeDocument) maybeOffset maybeLimit = getChildrenContext pId p t maybeOffset maybeLimit
getChildren pId p t@(Just NodeContact ) maybeOffset maybeLimit = getChildrenContext pId p t maybeOffset maybeLimit
getChildren a b c d e = getChildrenNode a b c d e


getChildrenNode :: (JSONB a, HasDBid NodeType)
            => ParentId
            -> proxy a
            -> Maybe NodeType
            -> Maybe Offset
            -> Maybe Limit
            -> Cmd err (NodeTableResult a)
getChildrenNode pId _ maybeNodeType maybeOffset maybeLimit = do
  -- printDebug "getChildrenNode" (pId, maybeNodeType)
  let query = selectChildrenNode pId maybeNodeType
  docs <- runOpaQuery
        $ limit'  maybeLimit
        $ offset' maybeOffset
        $ orderBy (asc _node_id)
        $ query
  docCount <- runCountOpaQuery query
  pure $ TableResult { tr_docs = docs, tr_count = docCount }


selectChildrenNode :: HasDBid NodeType
                   => ParentId
                   -> Maybe NodeType
                   -> Select NodeRead
selectChildrenNode parentId maybeNodeType = proc () -> do
    row@(Node _ _ typeName _ parent_id _ _ _) <- queryNodeTable -< ()
    let nodeType = maybe 0 toDBid maybeNodeType
    restrict -< typeName  .== sqlInt4 nodeType
    restrict -< parent_id .== (pgNodeId parentId)
    returnA -< row


getChildrenContext :: (JSONB a, HasDBid NodeType)
            => ParentId
            -> proxy a
            -> Maybe NodeType
            -> Maybe Offset
            -> Maybe Limit
            -> Cmd err (NodeTableResult a)
getChildrenContext pId _ maybeNodeType maybeOffset maybeLimit = do
  -- printDebug "getChildrenContext" (pId, maybeNodeType)
  let query = selectChildren' pId maybeNodeType

  docs <- runOpaQuery
        $ limit'  maybeLimit
        $ offset' maybeOffset
        $ orderBy (asc _context_id)
        $ query

  docCount <- runCountOpaQuery query
  pure $ TableResult { tr_docs = map context2node docs, tr_count = docCount }


selectChildren' :: HasDBid NodeType
               => ParentId
               -> Maybe NodeType
               -> Select ContextRead
selectChildren' parentId maybeNodeType = proc () -> do
    row@(Context cid _ typeName _ _ _ _ _) <- queryContextTable     -< ()
    (NodeContext _ nid cid' _ _)           <- queryNodeContextTable -< ()

    let nodeType = maybe 0 toDBid maybeNodeType
    restrict -< typeName  .== sqlInt4 nodeType

    restrict -< nid .== pgNodeId parentId
    restrict -< cid .== cid'
    returnA -< row