{- This file is part of Vervis.
 -
 - Written in 2016 by fr33domlover <fr33domlover@riseup.net>.
 -
 - ♡ Copying is an act of love. Please copy, reuse and share.
 -
 - The author(s) have dedicated all copyright and related and neighboring
 - rights to this software to the public domain worldwide. This software is
 - distributed without any warranty.
 -
 - You should have received a copy of the CC0 Public Domain Dedication along
 - with this software. If not, see
 - <http://creativecommons.org/publicdomain/zero/1.0/>.
 -}

module Darcs.Local.Inventory.Read
    ( readLatestInventory
    , readCompressedInventory
    )
where

import Prelude

import Codec.Compression.Zlib.Internal
import Control.Applicative (many, optional, liftA2)
import Control.Arrow (second)
import Control.Monad (replicateM_)
import Crypto.Hash
import Data.Attoparsec.ByteString
import Data.ByteArray (convert)
import Data.ByteString (ByteString)
import Data.Time.Calendar (fromGregorianValid)
import Data.Time.Clock (UTCTime (..), secondsToDiffTime)
import Data.Word (Word8)
import System.FilePath ((</>))

import qualified Data.ByteString as B
import qualified Data.ByteString.Char8 as BC
import qualified Data.ByteString.Base16 as B16
import qualified Data.ByteString.Lex.Integral as BX

import Control.Applicative.Local
import Darcs.Local.Hash.Codec
import Darcs.Local.Hash.Types
import Darcs.Local.Inventory.Parser
import Darcs.Local.Inventory.Types
import Data.Attoparsec.ByteString.Local
import Data.ByteString.Local (stripPrefix)
import Data.Text.UTF8.Local (decodeStrict)

darcsDir :: FilePath
darcsDir = "_darcs"

inventoryDir :: FilePath
inventoryDir = "inventories"

inventoryFile :: FilePath
inventoryFile = "hashed_inventory"

readLatestInventory :: FilePath -> Parser a -> IO (Either String a)
readLatestInventory repo =
    parseFileIncremental $ repo </> darcsDir </> inventoryFile

readCompressedInventory
    :: FilePath -> InventoryHash -> Parser a -> IO (Either String a)
readCompressedInventory repo ih =
    let invFile = BC.unpack $ encodeInventoryHash ih
        invPath = repo </> darcsDir </> inventoryDir </> invFile
        defParams = defaultDecompressParams
        bufSize = min (decompressBufferSize defParams) (ihSize ih)
        params = defParams { decompressBufferSize = bufSize }
    in  parseCompressedFileIncremental gzipFormat params invPath

{-
readLatestInventorySize :: FilePath -> IO (Either String Int)

readLatestInventoryAll :: FilePath -> IO (Either String LatestInventory)

readLatestInventoryPage
    :: Int -> Int -> FilePath -> IO (Either String LatestInventory)

readInventorySize :: FilePath -> IO (Either String Int)
readInventorySize repoPath = do
    let invPath = repoPath </> darcsDir </> inventoryFile
    parseFileIncremental invPath $ patchInfosCountP <* endOfInput

readPatchInfoAll :: FilePath -> IO (Either String PatchSeq)
readPatchInfoAll repoPath = do
    let invPath = repoPath </> darcsDir </> inventoryFile
    parseFileIncremental invPath $ patchInfosAllP <* endOfInput

readPatchInfoPage :: Int -> Int -> FilePath -> IO (Either String PatchSeq)
readPatchInfoPage off lim repoPath = do
    let invPath = repoPath </> darcsDir </> inventoryFile
    parseFileIncremental invPath $ patchInfosOffsetLimitP off lim
-}