module Hix.Env where

import qualified Data.Text.IO as Text
import Path (Abs, Dir, Path)

import Hix.Component (targetComponent)
import qualified Hix.Data.ComponentConfig
import Hix.Data.ComponentConfig (EnvRunner (EnvRunner), PackagesConfig, TargetOrDefault (DefaultTarget, ExplicitTarget))
import Hix.Data.Error (pathText)
import qualified Hix.Data.GhciConfig
import Hix.Json (jsonConfig)
import Hix.Monad (M)
import qualified Hix.Options as Options
import Hix.Options (EnvRunnerOptions, TargetSpec)

-- TODO when there is a solution for default command env fallback configuration, the DefaultTarget case must return
-- Nothing when the config requests it
componentRunner ::
  Maybe (Path Abs Dir) ->
  PackagesConfig ->
  TargetSpec ->
  M (Maybe EnvRunner)
componentRunner cliRoot config spec =
  targetComponent cliRoot config spec <&> \case
    ExplicitTarget t -> t.component.runner
    DefaultTarget t -> t.component.runner
    _ -> Nothing

envRunner :: EnvRunnerOptions -> M EnvRunner
envRunner opts = do
  config <- either pure jsonConfig opts.config
  fromMaybe config.defaultEnv . join <$> traverse (componentRunner opts.root config.packages) opts.component

printEnvRunner :: EnvRunnerOptions -> M ()
printEnvRunner opts = do
  EnvRunner runner <- envRunner opts
  liftIO (Text.putStrLn (pathText runner))