{-# LANGUAGE DuplicateRecordFields, DeriveGeneric, DeriveAnyClass #-}

-- ldgallery - A static generator which turns a collection of tagged
--             pictures into a searchable web gallery.
--
-- Copyright (C) 2019  Pacien TRAN-GIRARD
--
-- This program is free software: you can redistribute it and/or modify
-- it under the terms of the GNU Affero General Public License as
-- published by the Free Software Foundation, either version 3 of the
-- License, or (at your option) any later version.
--
-- This program is distributed in the hope that it will be useful,
-- but WITHOUT ANY WARRANTY; without even the implied warranty of
-- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-- GNU Affero General Public License for more details.
--
-- You should have received a copy of the GNU Affero General Public License
-- along with this program.  If not, see <https://www.gnu.org/licenses/>.


module Resource
  ( ResourceTree(..)
  , buildResourceTree
  ) where


import Data.Function ((&))
import Files
import Input


-- | Tree representing the compiled gallery resources.
data ResourceTree =
    ItemResource
      { sidecar :: Sidecar
      , path :: Path
      , itemThumbnailPath :: Path }
  | DirResource
      { items :: [ResourceTree]
      , path :: Path
      , dirThumbnailPath :: Maybe Path }
  deriving Show


  -- TODO: actually generate compilation strategies
buildResourceTree :: InputTree -> ResourceTree
buildResourceTree = resNode
  where
    resNode (InputFile path sidecar) =
      ItemResource sidecar (itemsDir /> path) (thumbnailsDir /> path)

    resNode (InputDir path thumbnailPath items) =
      map resNode items
      & \dirItems -> DirResource dirItems (itemsDir /> path) Nothing

    itemsDir = "items"
    thumbnailsDir = "thumbnails"