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--
-- | CLI interface to the CFSApp subcommand.
module CLI.CommandCFSApp
    (
      -- * Direct command access
      command
    , CommandOpts
    , ErrorCode

      -- * CLI
    , commandDesc
    , commandOptsParser
    )
  where

-- External imports
import Options.Applicative ( Parser, help, long, metavar, optional, showDefault,
                             strOption, value )

-- External imports: command results
import Command.Result ( Result )

-- External imports: actions or commands supported
import Command.CFSApp ( ErrorCode, cFSApp )

-- * Command

-- | Options needed to generate the cFS application.
data CommandOpts = CommandOpts
  { cFSAppTarget   :: String
  , cFSAppVarNames :: String
  , cFSAppVarDB    :: Maybe String
  }

-- | Create <https://cfs.gsfc.nasa.gov/ NASA core Flight System> (cFS)
-- applications that subscribe to the communication bus and call Copilot when
-- new messages arrive.
--
-- This is just an uncurried version of "Command.CFSApp".
command :: CommandOpts -> IO (Result ErrorCode)
command c =
  cFSApp (cFSAppTarget c) (cFSAppVarNames c) (cFSAppVarDB c)

-- * CLI

-- | cFS command description
commandDesc :: String
commandDesc = "Generate a complete cFS/Copilot application"

-- | Subparser for the @cfs@ command, used to generate a NASA Core Flight
-- System application connected to Copilot monitors.
commandOptsParser :: Parser CommandOpts
commandOptsParser = CommandOpts
  <$> strOption
        (  long "app-target-dir"
        <> metavar "DIR"
        <> showDefault
        <> value "copilot-cfs-demo"
        <> help strCFSAppDirArgDesc
        )
  <*> strOption
        (  long "variable-file"
        <> metavar "FILENAME"
        <> showDefault
        <> value "variables"
        <> help strCFSAppVarListArgDesc
        )
  <*> optional
        ( strOption
            (  long "variable-db"
            <> metavar "FILENAME"
            <> help strCFSAppVarDBArgDesc
            )
        )

-- | Argument target directory to cFS app generation command
strCFSAppDirArgDesc :: String
strCFSAppDirArgDesc = "Target directory"

-- | Argument variable list to cFS app generation command
strCFSAppVarListArgDesc :: String
strCFSAppVarListArgDesc =
  "File containing list of cFS/ICAROUS variables to make accessible"

-- | Argument variable database to cFS app generation command
strCFSAppVarDBArgDesc :: String
strCFSAppVarDBArgDesc =
  "File containing a DB of known cFS/ICAROUS variables"