{-# LANGUAGE Rank2Types #-}

{- |
Copyright:  (c) 2017-2020 Kowainik
SPDX-License-Identifier: MPL-2.0
Maintainer: Kowainik <xrom.xkov@gmail.com>

Functions to remove from your @life@ repository.
-}

module Life.Main.Remove
    ( lifeRemove
    ) where

import Colourista (warningMessage)
import Path (Abs, Path, Rel)
import Path.IO (getHomeDir, makeRelative, removeDirRecur, removeFile, resolveDir, resolveFile)
import Relude.Extra.Lens (Lens', (%~))

import Life.Configuration (LifeConfiguration, directoriesL, filesL, parseHomeLife, writeGlobalLife)
import Life.Core (LifePath (..), master)
import Life.Github (removeFromRepo, withSynced)
import Life.Message (abortCmd)
import Life.Path (LifeExistence (..), whatIsLife)

import qualified Data.Set as Set


-- | Remove path from existing life-configuration file.
lifeRemove :: LifePath -> IO ()
lifeRemove lPath = whatIsLife >>= \case
    -- if one of them is missing -- abort
    NoLife -> abortCmd "remove" ".life and docfiles/ do not exist"
    OnlyLife _ -> abortCmd "remove" "dotfiles/ directory doesn't exist"
    OnlyRepo _ -> abortCmd "remove" ".life file doesn't exist"
    -- actual life remove process
    Both _ _ -> withSynced master $ do
        homeDirPath  <- getHomeDir
        case lPath of
            (File path) -> do
                filePath <- resolveFile homeDirPath path >>= makeRelative homeDirPath
                resolveConfiguration filesL removeFile filePath
            (Dir path)  -> do
                dirPath <- resolveDir homeDirPath path >>= makeRelative homeDirPath
                resolveConfiguration directoriesL removeDirRecur dirPath

resolveConfiguration
    :: Lens' LifeConfiguration (Set (Path Rel t))
    -> (Path Abs t -> IO ()) -- ^ function to remove object
    -> Path Rel t
    -> IO ()
resolveConfiguration confLens removeFun path = do
    configuration <- parseHomeLife

    let newConfiguration = configuration & confLens %~ Set.delete path
    if configuration == newConfiguration
    then warningMessage "File or directory is not tracked" >> exitFailure
    else do
        writeGlobalLife newConfiguration
        removeFromRepo removeFun path