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--------------------------------------------------------------------------
--- Defining and processing tool options of CASS.
---
--- @author Michael Hanus
--- @version October 2023
--------------------------------------------------------------------------

module CASS.Options where

import System.Console.GetOpt
import Numeric               ( readNat )

--------------------------------------------------------------------------
-- Representation of command line options.
data Options = Options
  { optHelp    :: Bool     -- print help?
  , optVerb    :: Int      -- verbosity level
  , optServer  :: Bool     -- start CASS in server mode?
  , optWorker  :: Bool     -- start CASS in worker mode?
  , optPort    :: Int      -- port number (if used in server mode)
  , optAll     :: Bool     -- show analysis results for all operations?
  , optReAna   :: Bool     -- force re-analysis?
  , optDelete  :: Bool     -- delete analysis files?
  , optProp    :: [(String,String)] -- property (of ~/.curryanalsisrc) to be set
  }

-- Default command line options.
defaultOptions :: Options
defaultOptions = Options
  { optHelp    = False
  , optVerb    = -1
  , optServer  = False
  , optWorker  = False
  , optPort    = 0
  , optAll     = False
  , optReAna   = False
  , optDelete  = False
  , optProp    = []
  }

-- Definition of actual command line options.
options :: [OptDescr (Options -> Options)]
options =
  [ Option "h?" ["help"]  (NoArg (\opts -> opts { optHelp = True }))
           "print help and exit"
  , Option "q" ["quiet"] (NoArg (\opts -> opts { optVerb = 0 }))
           "run quietly (no output)"
  , Option "v" ["verbosity"]
            (ReqArg (safeReadNat checkVerb) "<n>")
            "verbosity/debug level:\n0: quiet (same as `-q')\n1: show worker activity, e.g., timings\n2: show server communication\n3: ...and show read/store information\n4: ...show also stored/computed analysis data\n(default: see debugLevel in ~/.curryanalysisrc)"
  , Option "a" ["all"]
           (NoArg (\opts -> opts { optAll = True }))
           "show analysis results for all operations\n(i.e., also for non-exported operations)"
  , Option "r" ["reanalyze"]
           (NoArg (\opts -> opts { optReAna = True }))
           "force re-analysis \n(i.e., ignore old analysis information)"
  , Option "d" ["delete"]
           (NoArg (\opts -> opts { optDelete = True }))
           "delete existing analysis results"
  , Option "s" ["server"]
           (NoArg (\opts -> opts { optServer = True }))
           "start analysis system in server mode"
  , Option "w" ["worker"]
           (NoArg (\opts -> opts { optWorker = True }))
           "start analysis system in worker mode"
  , Option "p" ["port"]
           (ReqArg (safeReadNat (\n opts -> opts { optPort = n })) "<n>")
           "port number for communication\n(only for server mode;\n if omitted, a free port number is selected)"
  , Option "D" []
            (ReqArg checkSetProperty "name=v")
           "set property (of ~/.curryanalysisrc)\n`name' as `v'"
  ]
 where
  safeReadNat opttrans s opts = case readNat s of
     [(n,"")] -> opttrans n opts
     _        -> error "Illegal number argument (try `-h' for help)"

  checkVerb n opts = if n>=0 && n<5
                     then opts { optVerb = n }
                     else error "Illegal verbosity level (try `-h' for help)"

  checkSetProperty s opts =
    let (key,eqvalue) = break (=='=') s
     in if null eqvalue
         then error "Illegal property setting (try `-h' for help)"
         else opts { optProp = optProp opts ++ [(key,tail eqvalue)] }


--------------------------------------------------------------------------