-- | Script output type. We launch the executable asked after
-- injecting the environment variables related to the report.

module OrgStat.Outputs.Script
       ( processScriptOutput
       ) where

import Universum

import Control.Lens (views)
import qualified Data.Map.Strict as M
import System.Environment (lookupEnv, setEnv, unsetEnv)
import System.Process (callCommand)

import OrgStat.Ast (filterHasClock, orgTotalDuration)
import OrgStat.Config (confReports, crName)
import OrgStat.Helpers (resolveReport)
import OrgStat.Logging
import OrgStat.Outputs.Types (ScriptParams (..))
import OrgStat.Util (timeF)
import OrgStat.WorkMonad (WorkM, wcConfig)

-- | Processes script output.
processScriptOutput :: ScriptParams -> WorkM ()
processScriptOutput ScriptParams{..} = do
    -- Considering all the reports if none are specified.
    reportsToConsider <- case spReports of
          [] -> views wcConfig (map crName . confReports)
          xs -> pure xs
    allReports <- mapM (\r -> (r,) <$> resolveReport r) reportsToConsider

    -- Set env variables
    prevVars <- forM allReports $ \(toString -> reportName,org) -> do
        let duration = timeF $ orgTotalDuration $ filterHasClock org
        logDebug $ "Variable " <> show reportName <> " duration is " <> show duration
        (prevVar :: Maybe String) <- liftIO $ lookupEnv reportName
        liftIO $ setEnv reportName (toString duration)
        pure $ (reportName,) <$> prevVar
    let prevVarsMap :: Map String String
        prevVarsMap = M.fromList $ catMaybes prevVars

    -- Execute script
    let cmdArgument = either id (\t -> "-c \"" <> toString t <> "\"") spScript
    liftIO $ callCommand $
        spInterpreter <> " " <> cmdArgument
        --"/bin/env sh " <> cmdArgument

    -- Restore the old variables, clean new.
    forM_ (map fst allReports) $ \(toString -> reportName) -> do
        liftIO $ case M.lookup reportName prevVarsMap of
            Nothing        -> unsetEnv reportName
            Just prevValue -> setEnv reportName prevValue