module Verismith.OptParser
    ( OptTool (..)
    , Opts (..)
    , opts
    )
where

import           Control.Applicative ((<|>))
import           Data.Text           (Text)
import qualified Data.Text           as T
import           Options.Applicative (Mod (..), OptionFields (..), Parser (..),
                                      ParserInfo (..), ReadM (..), (<**>))
import qualified Options.Applicative as Opt
import           Prelude             hiding (FilePath (..))
import           Shelly              (FilePath (..), fromText)
import           Verismith.Config    (SynthDescription (..), versionInfo)

data OptTool = TYosys
             | TXST
             | TIcarus

instance Show OptTool where
  show TYosys  = "yosys"
  show TXST    = "xst"
  show TIcarus = "icarus"

data Opts = Fuzz { fuzzOutput          :: Text
                 , fuzzConfigFile      :: !(Maybe FilePath)
                 , fuzzForced          :: !Bool
                 , fuzzKeepAll         :: !Bool
                 , fuzzNum             :: {-# UNPACK #-} !Int
                 , fuzzNoSim           :: !Bool
                 , fuzzNoEquiv         :: !Bool
                 , fuzzNoReduction     :: !Bool
                 , fuzzExistingFile    :: !(Maybe FilePath)
                 , fuzzExistingFileTop :: !Text
                 , fuzzCrossCheck      :: !Bool
                 , fuzzChecker         :: !(Maybe Text)
                 }
          | Generate { generateFilename   :: !(Maybe FilePath)
                     , generateConfigFile :: !(Maybe FilePath)
                     }
          | Parse { parseFilename            :: !FilePath
                  , parseTop                 :: !Text
                  , parseOutput              :: !(Maybe FilePath)
                  , parseRemoveConstInConcat :: !Bool
                  }
          | Reduce { reduceFilename        :: !FilePath
                   , reduceTop             :: !Text
                   , reduceScript          :: !(Maybe FilePath)
                   , reduceSynthesiserDesc :: ![SynthDescription]
                   , reduceRerun           :: !Bool
                   }
          | ConfigOpt { configOptWriteConfig :: !(Maybe FilePath)
                      , configOptConfigFile  :: !(Maybe FilePath)
                      , configOptDoRandomise :: !Bool
                      }

textOption :: Mod OptionFields String -> Parser Text
textOption = fmap T.pack . Opt.strOption

optReader :: (String -> Maybe a) -> ReadM a
optReader f = Opt.eitherReader $ \arg -> case f arg of
    Just a  -> Right a
    Nothing -> Left $ "Cannot parse option: " <> arg

parseSynth :: String -> Maybe OptTool
parseSynth val | val == "yosys" = Just TYosys
               | val == "xst"   = Just TXST
               | otherwise      = Nothing

parseSynthDesc :: String -> Maybe SynthDescription
parseSynthDesc val
    | val == "yosys" = Just $ SynthDescription "yosys" Nothing Nothing Nothing
    | val == "vivado" = Just $ SynthDescription "vivado" Nothing Nothing Nothing
    | val == "xst" = Just $ SynthDescription "xst" Nothing Nothing Nothing
    | val == "quartus" = Just
    $ SynthDescription "quartus" Nothing Nothing Nothing
    | val == "identity" = Just
    $ SynthDescription "identity" Nothing Nothing Nothing
    | otherwise = Nothing

parseSim :: String -> Maybe OptTool
parseSim val | val == "icarus" = Just TIcarus
             | otherwise       = Nothing

fuzzOpts :: Parser Opts
fuzzOpts =
    Fuzz
        <$> textOption
                (  Opt.long "output"
                <> Opt.short 'o'
                <> Opt.metavar "DIR"
                <> Opt.help "Output directory that the fuzz run takes place in."
                <> Opt.showDefault
                <> Opt.value "output")
        <*> (  Opt.optional
            .  Opt.strOption
            $  Opt.long "config"
            <> Opt.short 'c'
            <> Opt.metavar "FILE"
            <> Opt.help "Config file for the current fuzz run.")
        <*> (Opt.switch $ Opt.long "force" <> Opt.short 'f' <> Opt.help
                "Overwrite the specified directory.")
        <*> (Opt.switch $ Opt.long "keep" <> Opt.short 'k' <> Opt.help
                "Keep all the directories.")
        <*> (  Opt.option Opt.auto
            $  Opt.long "num"
            <> Opt.short 'n'
            <> Opt.help "The number of fuzz runs that should be performed."
            <> Opt.showDefault
            <> Opt.value 1
            <> Opt.metavar "INT")
        <*> (Opt.switch $ Opt.long "no-sim" <> Opt.help
                "Do not run simulation on the output netlist.")
        <*> (Opt.switch $ Opt.long "no-equiv" <> Opt.help
                "Do not run an equivalence check on the output netlist.")
        <*> (Opt.switch $ Opt.long "no-reduction" <> Opt.help
                "Do not run reduction on a failed testcase.")
        <*> (  Opt.optional
            .  Opt.strOption
            $  Opt.long "source"
            <> Opt.short 's'
            <> Opt.metavar "FILE"
            <> Opt.help "Name of the top module.")
        <*> textOption
                (  Opt.long "source-top"
                <> Opt.short 't'
                <> Opt.metavar "TOP"
                <> Opt.help "Define the top module for the source file."
                <> Opt.showDefault
                <> Opt.value "top")
        <*> (Opt.switch $ Opt.long "crosscheck" <> Opt.help
                "Do not only compare against the original design, but also against other netlists.")
        <*> (Opt.optional . textOption $
                Opt.long "checker"
                <> Opt.metavar "CHECKER"
                <> Opt.help "Define the checker to use.")

genOpts :: Parser Opts
genOpts =
    Generate
        <$> (  Opt.optional
            .  Opt.strOption
            $  Opt.long "output"
            <> Opt.short 'o'
            <> Opt.metavar "FILE"
            <> Opt.help "Output to a verilog file instead."
            )
        <*> (  Opt.optional
            .  Opt.strOption
            $  Opt.long "config"
            <> Opt.short 'c'
            <> Opt.metavar "FILE"
            <> Opt.help "Config file for the generation run."
            )

parseOpts :: Parser Opts
parseOpts = Parse
    <$> (fromText . T.pack <$> Opt.strArgument
            (Opt.metavar "FILE" <> Opt.help "Verilog input file."))
    <*> textOption ( Opt.short 't'
                     <> Opt.long "top"
                     <> Opt.metavar "TOP"
                     <> Opt.help "Name of top level module."
                     <> Opt.showDefault
                     <> Opt.value "top"
                   )
    <*> ( Opt.optional
          . Opt.strOption
          $ Opt.long "output"
          <> Opt.short 'o'
          <> Opt.metavar "FILE"
          <> Opt.help "Output file to write the parsed file to.")
    <*> (Opt.switch $ Opt.long "remove-const-in-concat" <> Opt.help
            "Remove constants in concatenation to simplify the Verilog.")

reduceOpts :: Parser Opts
reduceOpts =
    Reduce
        .   fromText
        .   T.pack
        <$> Opt.strArgument (Opt.metavar "FILE" <> Opt.help "Verilog input file.")
        <*> textOption
                (  Opt.short 't'
                <> Opt.long "top"
                <> Opt.metavar "TOP"
                <> Opt.help "Name of top level module."
                <> Opt.showDefault
                <> Opt.value "top"
                )
        <*> (  Opt.optional
            .  Opt.strOption
            $  Opt.long "script"
            <> Opt.metavar "SCRIPT"
            <> Opt.help
                   "Script that determines if the current file is interesting, which is determined by the script returning 0."
            )
        <*> (  Opt.many
            .  Opt.option (optReader parseSynthDesc)
            $  Opt.short 's'
            <> Opt.long "synth"
            <> Opt.metavar "SYNTH"
            <> Opt.help "Specify synthesiser to use."
            )
        <*> (  Opt.switch
            $  Opt.short 'r'
            <> Opt.long "rerun"
            <> Opt.help
                   "Only rerun the current synthesis file with all the synthesisers."
            )

configOpts :: Parser Opts
configOpts =
    ConfigOpt
        <$> (  Opt.optional
            .  Opt.strOption
            $  Opt.long "output"
            <> Opt.short 'o'
            <> Opt.metavar "FILE"
            <> Opt.help "Output to a TOML Config file."
            )
        <*> (  Opt.optional
            .  Opt.strOption
            $  Opt.long "config"
            <> Opt.short 'c'
            <> Opt.metavar "FILE"
            <> Opt.help "Config file for the current fuzz run."
            )
        <*> (  Opt.switch
            $  Opt.long "randomise"
            <> Opt.short 'r'
            <> Opt.help
                   "Randomise the given default config, or the default config by randomly switchin on and off options."
            )

argparse :: Parser Opts
argparse =
    Opt.hsubparser
            (  Opt.command
                    "fuzz"
                    (Opt.info
                        fuzzOpts
                        (Opt.progDesc
                            "Run fuzzing on the specified simulators and synthesisers."
                        )
                    )
            <> Opt.metavar "fuzz"
            )
        <|> Opt.hsubparser
                (  Opt.command
                        "generate"
                        (Opt.info
                            genOpts
                            (Opt.progDesc "Generate a random Verilog program.")
                        )
                <> Opt.metavar "generate"
                )
        <|> Opt.hsubparser
                (  Opt.command
                        "parse"
                        (Opt.info
                            parseOpts
                            (Opt.progDesc
                                "Parse a verilog file and output a pretty printed version."
                            )
                        )
                <> Opt.metavar "parse"
                )
        <|> Opt.hsubparser
                (  Opt.command
                        "reduce"
                        (Opt.info
                            reduceOpts
                            (Opt.progDesc
                                "Reduce a Verilog file by rerunning the fuzzer on the file."
                            )
                        )
                <> Opt.metavar "reduce"
                )
        <|> Opt.hsubparser
                (  Opt.command
                        "config"
                        (Opt.info
                            configOpts
                            (Opt.progDesc
                                "Print the current configuration of the fuzzer."
                            )
                        )
                <> Opt.metavar "config"
                )

version :: Parser (a -> a)
version = Opt.infoOption versionInfo $ mconcat
    [Opt.long "version", Opt.short 'v', Opt.help "Show version information.", Opt.hidden]

opts :: ParserInfo Opts
opts = Opt.info
    (argparse <**> Opt.helper <**> version)
    (  Opt.fullDesc
    <> Opt.progDesc "Fuzz different simulators and synthesisers."
    <> Opt.header
           "Verismith - A hardware simulator and synthesiser Verilog fuzzer."
    )