{-# LANGUAGE OverloadedStrings #-}

module Data.Git.Object
       ( Object(..)
       , Ref(..)
       , revParse
       , lookupObject )
       where

import           Data.ByteString as B hiding (map)
import           Data.Git.Blob
import           Data.Git.Commit
import           Data.Git.Internal
import           Data.Git.Tag
import           Data.Git.Tree
import qualified Data.Map as M

data Object = BlobObj   Blob
            | TreeObj   Tree
            | CommitObj Commit
            | TagObj    Tag

data Ref a = FullHash a
           | PartialHash a
           | BranchName a
           | TagName a
           | RefName a
           | FullRefName a
           | Specifier a

revParse :: CStringable a => Ref a -> IO (Maybe Oid)
revParse (FullHash r)    = stringToOid r
revParse (PartialHash r) = stringToOid r
revParse (BranchName r)  = undefined
revParse (TagName r)     = undefined
revParse (RefName r)     = undefined
revParse (FullRefName r) = undefined
revParse (Specifier r)   = undefined

lookupObject :: Repository -> Oid -> IO (Maybe Object)
lookupObject repo oid =
  lookupObject' repo oid
    (\x y z    -> c'git_object_lookup x y z c'GIT_OBJ_ANY)
    (\x y z l  -> c'git_object_lookup_prefix x y z l c'GIT_OBJ_ANY)
    (\coid x y -> c'git_object_type y >>= createObject repo coid x)

createObject :: Repository -> COid -> ForeignPtr C'git_object -> C'git_otype
             -> IO Object
createObject repo coid obj typ
  | typ == c'GIT_OBJ_BLOB =
    return $ BlobObj Blob { _blobInfo =
                               newBase repo (Right coid) (Just obj)
                          , _blobContents = B.empty }

  | typ == c'GIT_OBJ_TREE =
    return $ TreeObj Tree { _treeInfo =
                               newBase repo (Right coid) (Just obj)
                          , _treeContents = M.empty }

  | otherwise = return undefined

-- Object.hs