module Package (
  clonePkg,
  CloneUser(..),
  fedpkg,
  fedpkg_,
  checkForSpecFile,
  getChangelog,
  cleanChangelog,
  changeLogPrompt,
  getBranchDist,
  getPackageName,
  getSummaryURL,
  findSpecfile,
  maybeFindSpecfile,
  localBranchSpecFile,
  putPkgHdr,
  putPkgBrnchHdr,
  putPkgAnyBrnchHdr,
  withExistingDirectory,
  initialPkgRepo,
  withPackagesByBranches,
  withPackagesBranch,
  withPackagesMaybeBranch,
  withPackagesMaybeBranchNoHeadergit,
  HeaderShow(..),
  boolHeader,
  LimitBranches(..),
  cleanGit,
  cleanGitActive,
  cleanGitFetch,
  cleanGitFetchActive,
  dirtyGit,
  dirtyGitActive,
  dirtyGitFetch,
  dirtyGitHEAD,
  Package(..),
  packageSpec,
  pkgNameVerRel,
  pkgNameVerRel',
  equivNVR,
  editSpecField,
  isAutoRelease
  ) where

import Distribution.Fedora hiding (Fedora,EPEL,EPELNext)
import SimpleCmd.Rpm
import SimplePrompt (prompt)

import Branches
import Common
import Common.System
import Git
import Krb

fedpkg :: String -> [String] -> IO String
fedpkg c args =
  cmd "fedpkg" (c:args)

fedpkg_ :: String -> [String] -> IO ()
fedpkg_ c args =
  cmd_ "fedpkg" (c:args)

checkForSpecFile :: String -> IO ()
checkForSpecFile spec = do
  have <- doesFileExist spec
  unless have $ error' $ spec +-+ "not found"

-- FIXME allow editor to be used
changeLogPrompt :: Bool -> FilePath -> IO String
changeLogPrompt isupdate spec = do
  clog <- cleanChangelog spec
  putNewLn
  putStrLn "```"
  putStr clog
  putStrLn "```"
  -- FIXME is this actually useful?
  tty <- isTty
  if not tty
    then return clog
    else do
    userlog <- prompt $ "Press Enter to use above or input" +-+ (if isupdate then "update" else "change") +-+ "summary now" ++ if isupdate then "; or 'no' to skip update" else ""
    return $ if null userlog then clog else userlog

getChangelog :: FilePath -> IO [String]
getChangelog spec = do
  autochangelog <- grep_ "^%autochangelog" spec
  if autochangelog
    then takeWhile (not . null) . drop 1 <$>
         cmdLines "rpmautospec" ["generate-changelog", spec]
    else cmdLines "rpmspec" ["-q", "--srpm", "--qf", "%{changelogtext}", spec]

cleanChangelog :: FilePath -> IO String
cleanChangelog spec = do
  ls <- getChangelog spec
  return $
    case filter ("- " `isPrefixOf`) ls of
      [l] -> removePrefix "- " l ++ "\n"
      _ -> unlines ls

getSummaryURL :: FilePath -> IO String
getSummaryURL spec = do
  notes <- cmd "rpmspec" ["-q", "--srpm", "--qf", "%{summary}\n\n- %{url}", spec]
  putNewLn
  putStrLn "```"
  putStrLn notes
  putStrLn "```"
  ifM (not <$> isTty)
    (return notes) $
    do
      usernote <- prompt "Press Enter to use above or input notes"
      return $ if null usernote then notes else usernote

-- FIXME check spec filename/%name more carefully
getPackageName :: FilePath -> IO Package
getPackageName pkgdir =
  if pkgdir == "."
  then Package <$> getDirectoryName
  else return $ Package $ takeFileName pkgdir

findSpecfile :: IO FilePath
findSpecfile = do
  mspec <- maybeFindSpecfile
  case mspec of
    Just spec -> return spec
    Nothing -> do
      dir <- getDirectoryName
      error' $ "No spec file found in:" +-+ dir

-- adapted from fileWithExtension
maybeFindSpecfile :: IO (Maybe FilePath)
maybeFindSpecfile = do
  files <- filter (".spec" `isExtensionOf`) <$> listDirectory "."
  case files of
    [] -> return Nothing
    [spec] -> return $ Just spec
    _ -> error' $ "More than one .spec file:" +-+ unwords files

localBranchSpecFile :: Package -> AnyBranch -> IO FilePath
localBranchSpecFile pkg br = do
  gitdir <- isPkgGitRepo
  if gitdir
    then do
    gitSwitchBranch br
    let spec = packageSpec pkg
    ifM (doesFileExist spec)
      (return spec) $
      do
        mspec <- maybeFindSpecfile
        case mspec of
          Just spc -> do
            putStrLn $ "Warning: directory name differs from" +-+ spc ++ "\n"
            return spc
          Nothing -> error' $ "No spec file for:" +-+ unPackage pkg
    else findSpecfile

withExistingDirectory :: FilePath -> IO a -> IO a
withExistingDirectory dir act = do
  exists <- doesDirectoryExist dir
  if exists
  then withCurrentDirectory dir act
  else error' $ "No such directory:" +-+ dir

-- newly created Fedora repos/branches have just one README commit
initialPkgRepo :: IO Bool
initialPkgRepo = do
  commits <- length <$> gitShortLogN (Just 2) Nothing
  return $ commits <= 1

newtype Package = Package {unPackage :: String}
  deriving Eq

putPkgHdr :: Package -> IO ()
putPkgHdr pkg =
  putStrLn $ "\n=" +-+ unPackage pkg +-+ "="

putPkgBrnchHdr :: Package -> Branch -> IO ()
putPkgBrnchHdr pkg br =
  putStrLn $ "\n==" +-+ unPackage pkg +-+ show br +-+ "=="

putPkgAnyBrnchHdr :: Package -> AnyBranch -> IO ()
putPkgAnyBrnchHdr pkg br =
  putStrLn $ "\n==" +-+ unPackage pkg +-+ show br +-+ "=="

packageSpec :: Package -> FilePath
packageSpec pkg = unPackage pkg <.> "spec"

data GitOpts =
  GitOpts
  { gitOptClean :: Bool
  , gitOptFetch :: Bool
  , gitOptActive :: Bool
  , gitOptHEAD :: Bool -- allow detached head/rebase state
  }

cleanGit, cleanGitActive, cleanGitFetch, cleanGitFetchActive, dirtyGit, dirtyGitActive, dirtyGitFetch, dirtyGitHEAD :: Maybe GitOpts
--                                   clean fetch active HEAD
cleanGit =            Just $ GitOpts True  False False  False
cleanGitActive =      Just $ GitOpts True  False True   False
cleanGitFetch =       Just $ GitOpts True  True  False  False
cleanGitFetchActive = Just $ GitOpts True  True  True   False
dirtyGit =            Just $ GitOpts False False False  False
dirtyGitActive =      Just $ GitOpts False False True   False
dirtyGitFetch =       Just $ GitOpts False True  False  False
dirtyGitHEAD =        Just $ GitOpts False False False  True

data LimitBranches = AnyNumber | Zero | ZeroOrOne | ExactlyOne
  deriving Eq

data HeaderShow = HeaderNone | HeaderMay | HeaderMust
  deriving Eq

boolHeader :: Bool -> HeaderShow
boolHeader b = if b then HeaderMust else HeaderMay

withPackagesByBranches :: HeaderShow
                       -> Bool
                       -> Maybe GitOpts
                       -> LimitBranches
                       -> (Package -> AnyBranch -> IO ())
                       -> (BranchesReq,[String])
                       -> IO ()
withPackagesByBranches header count mgitopts limitBranches action (breq,pkgs) =
  if null pkgs
    then withPackageDir (0, ".")
    else do
    let numpkgs = length pkgs
    when (numpkgs > 1 && breq == Branches []) $
      case limitBranches of
        Zero -> return ()
        ZeroOrOne -> warning "Better to specify an explicit branch for multiple packages"
        _ -> error' "At least one branch must be specified when there are multiple packages"
    mapM_ withPackageDir $ zip [numpkgs,(numpkgs-1)..1] pkgs
  where
    -- FIXME support arbitrary (module) branches
    withPackageDir :: (Int,FilePath) -> IO ()
    withPackageDir (n, path) = do
      let dir =
            if ".spec" `isExtensionOf` path
            then takeDirectory path
            else path
      withExistingDirectory dir $ do
        mspec <- if ".spec" `isExtensionOf` path
                then return $ Just $ takeFileName path
                else maybeFindSpecfile
        pkg <- Package <$>
               case mspec of
                 -- FIXME fails if spec file can't be parsed and also is *slow*
                 -- cmd "rpmspec" ["-q", "--srpm", "--qf", "%{name}", spec]
                 -- For now assume spec filename = package name
                 Just spec -> return $ takeBaseName spec
                 Nothing -> getDirectoryName
        when (count && length pkgs >= 2) $
          putStrLn $ plural n "package" +-+ "left"
        unless (isNothing mspec || mspec == Just (unPackage pkg <.> "spec")) $
          putStrLn $ "Warning: package name (" ++ unPackage pkg ++ ") differs from spec filename!"
        haveGit <- isPkgGitRepo
        when (isJust mgitopts && not haveGit) $
          error' $ "Not a pkg git dir:" +-+ unPackage pkg
        mcurrentbranch <-
          if haveGit
          then
            if have gitOptHEAD
            then do
              cur <- gitCurrentBranch'
              if cur == OtherBranch "HEAD"
                then warning "detached HEAD" >> return Nothing
                else return $ Just cur
            else Just <$> gitCurrentBranch
          else return Nothing
        brs <- listOfAnyBranches (haveGit && not (have gitOptHEAD)) (have gitOptActive) breq
        case limitBranches of
          ZeroOrOne | length brs > 1 ->
            -- FIXME: could be handled better (testcase: run long list of packages in wrong directory)
            error' $ "more than one branch given:" +-+ unwords (map show brs)
          ExactlyOne | null brs ->
            error' "please specify one branch"
          ExactlyOne | length brs > 1 ->
            error' "please only specify one branch"
          _ -> return ()
        let fetch = have gitOptFetch
        when ((header /= HeaderNone || fetch) && dir /= ".") $
          case brs of
            [br] -> when (fetch || header == HeaderMust) $ putPkgAnyBrnchHdr pkg br
            _ -> when (fetch || header /= HeaderNone) $ putPkgHdr pkg
        when haveGit $
          when (have gitOptClean) checkWorkingDirClean
        when fetch $ gitFetchSilent False
        -- FIXME!! no branch restriction
        when (breq `elem` map BranchOpt [AllBranches,AllFedora,AllEPEL]) $
          putStrLn $ "Branches:" +-+ unwords (map show brs) ++ "\n"
        -- FIXME add newline at end?
        let action' p b = do
              when (header /= HeaderNone && length brs > 1) $ putPkgAnyBrnchHdr p b
              action p b
        mapM_ (action' pkg) brs
        when (length brs /= 1) $
          whenJust mcurrentbranch gitSwitchBranch

    have :: (GitOpts -> Bool) -> Bool
    have opt = maybe False opt mgitopts

withPackagesBranch :: HeaderShow
                   -> Bool
                   -> Maybe GitOpts
                   -> (Package -> AnyBranch -> IO ())
                   -> (Branch,[String])
                   -> IO ()
withPackagesBranch header count mgitopts action (br, pkgs) =
  withPackagesByBranches header count mgitopts ExactlyOne action (Branches [br],pkgs)

withPackagesMaybeBranch :: HeaderShow
                        -> Bool
                        -> Maybe GitOpts
                        -> (Package -> AnyBranch -> IO ())
                        -> (Maybe Branch,[String])
                        -> IO ()
withPackagesMaybeBranch header count mgitopts action (mbr, pkgs) =
  withPackagesByBranches header count mgitopts ZeroOrOne action (Branches (maybeToList mbr),pkgs)

withPackagesMaybeBranchNoHeadergit :: (Package -> AnyBranch -> IO ())
                                   -> (Maybe Branch,[String])
                                   -> IO ()
withPackagesMaybeBranchNoHeadergit =
  withPackagesMaybeBranch HeaderNone False Nothing

data CloneUser = AnonClone | UserClone

clonePkg :: Bool -> CloneUser -> Maybe Branch -> String -> IO ()
clonePkg quiet cloneuser mbr pkg = do
  exists <- doesDirectoryExist pkg
  if exists
    then putStrLn $ pkg ++ "/ already exists"
    else do
    let mbranch = case mbr of
          Nothing -> []
          Just br -> ["--branch", show br]
    case cloneuser of
      AnonClone -> do
        msgout
        git_ "clone" $ ["--quiet"] ++ mbranch ++ ["https://src.fedoraproject.org/rpms/" ++ pkg <.> "git"]
      UserClone -> do
        fasid <- fasIdFromKrb
        msgout
        git_ "clone" $ ["--quiet"] ++ mbranch ++ ["ssh://" ++ fasid ++ "@pkgs.fedoraproject.org/rpms/" ++ pkg <.> "git"]
  where
    msgout =
      putStrLn $ if quiet then "cloning..." else "Cloning:" +-+ pkg

isAutoRelease :: FilePath -> IO Bool
isAutoRelease spec = do
  matches <- filter ("Release:" `isPrefixOf`) <$> grep "%autorelease" spec
  return $ not (null matches)

pkgNameVerRel :: Branch -> FilePath -> IO (Maybe String)
pkgNameVerRel br spec = do
  disttag <- rpmDistTag <$> branchDist br
  -- workaround dist with bootstrap
  hostdist <- cmd "rpm" ["--eval", "%{dist}"]
  -- FIXME more precise regexp with "Release:"
  autorelease <- isAutoRelease spec
  nvrs <-
    if autorelease
    then do
      --putStrLn "%autorelease detected"
      mautospec <- findExecutable "rpmautospec"
      when (isNothing mautospec) $
        error' "requires rpmautospec.."
      autorel <- last . words <$> cmd "rpmautospec" ["calculate-release", spec]
      rpmspec ["--srpm"] (Just ("%{name}-%{version}-" ++ autorel ++ disttag)) spec
    else rpmspec ["--srpm"] (Just "%{name}-%{version}-%{release}") spec
  seq disttag $
    return $
    case nvrs of
      [] -> Nothing
      [nvr] -> Just (replace hostdist disttag nvr)
      _ -> error' "could not determine unique nvr"

pkgNameVerRel' :: Branch -> FilePath -> IO String
pkgNameVerRel' br spec = do
  mnvr <- pkgNameVerRel br spec
  case mnvr of
    Nothing -> error' $ "rpmspec failed to parse" +-+ spec
    Just nvr -> return nvr

getBranchDist :: AnyBranch -> IO Dist
getBranchDist (RelBranch br) = branchDist br
getBranchDist (OtherBranch _) = systemBranch >>= branchDist

-- FIXME should be more strict about dist tag (eg .fcNN only)
-- FIXME replace with NVR's?
equivNVR :: String -> String -> Bool
equivNVR nvr1 nvr2
  | nvr1 == nvr2 = True
  | length nvr1 /= length nvr2 = False
  | otherwise =
      -- (name-ver-rel,.dist)
      let (nvr, r) = splitExtension nvr1
          (nvr', r') = splitExtension nvr2
      in nvr == nvr' &&
           -- (dist,.more)
           let (r1,r1') = splitExtension $ tail r
               (r2,r2') = splitExtension $ tail r'
           -- allow differing dist
           in length r1 == length r2 && r1' == r2'

-- data BrPkg = IsBr AnyBranch | Unknown String | IsPkg String
--   deriving Show

-- splitBranchesPkgs :: Bool -> Maybe BranchOpts -> Bool -> [String]
--                   -> IO ([AnyBranch], [String])
-- splitBranchesPkgs release mbrnchopts exists args = do
--   pkggit <- isPkgGitRepo
--   brPkgs <- mapM (toBrPkg pkggit) args
--   let (brs,pkgs) = brPkgsToBranchesPkgs brPkgs
--   return $ case mbrnchopts of
--     Just _ | brs /= [] -> error' "cannot specify branches with branch options"
--     _ -> (brs,pkgs)
--   where
--     toBrPkg :: Bool -> String -> IO BrPkg
--     toBrPkg gitdir str =
--       case anyBranch str of
--         rbr@(RelBranch _) -> return (IsBr rbr)
--         abr@(OtherBranch p) -> if release then return (IsPkg p)
--                else
--                  ifM (isPath str)
--                  (return $ IsPkg str) $
--                  if gitdir
--                  then return (IsBr abr)
--                  else return $ if exists
--                                then IsBr abr
--                                else IsPkg str
--       where
--         isPath :: FilePath -> IO Bool
--         isPath fp =
--           if ".spec" `isExtensionOf` fp
--           then do
--             exists' <- doesFileExist fp
--             unless exists' $ error' $ fp +-+ "file not found"
--             return True
--           else do
--             exists' <- doesDirectoryExist fp
--             let ispath = '/' `elem` fp
--             when (not exists' && ispath) $
--               error' $ fp +-+ "directory not found"
--             return exists'

--     brPkgsToBranchesPkgs :: [BrPkg] -> ([AnyBranch], [String])
--     brPkgsToBranchesPkgs brpkgs =
--       let (pbrs,ppkgs) = span isBranch brpkgs
--       in (map toBranch pbrs, map toPackage ppkgs)
--       where
--         isBranch :: BrPkg -> Bool
--         isBranch (IsBr _) = True
--         isBranch (Unknown _) = True
--         isBranch (IsPkg _) = False

--         toBranch :: BrPkg -> AnyBranch
--         toBranch (IsBr br) = br
--         toBranch (Unknown br) = OtherBranch br
--         toBranch (IsPkg p) = error' $ "can't map package to branch:" +-+ p

--         toPackage :: BrPkg -> String
--         toPackage (IsPkg p) = p
--         toPackage (Unknown p) = p
--         toPackage (IsBr b) = error' $ "can't map branch to package:" +-+ show b

editSpecField :: String -> String -> FilePath -> IO ()
editSpecField field new spec =
  cmd_ "sed" ["-i", "-e s/^\\(" ++ field ++ ":\\s\\+\\).*/\\1" ++ new ++ "/", spec]