module ProjectM36.Server.ParseArgs where
import ProjectM36.Base
import ProjectM36.Client
import Options.Applicative
import ProjectM36.Server.Config
import Data.Monoid

parseArgsWithDefaults :: ServerConfig -> Parser ServerConfig
parseArgsWithDefaults defaults = ServerConfig <$> 
                     parsePersistenceStrategy <*> 
                     parseDatabaseName <*> 
                     parseHostname (bindHost defaults) <*> 
                     parsePort (bindPort defaults) <*> 
                     many parseGhcPkgPaths <*> 
                     parseTimeout (perRequestTimeout defaults) <*> 
                     pure False
                     
parsePersistenceStrategy :: Parser PersistenceStrategy
parsePersistenceStrategy = CrashSafePersistence <$> (dbdirOpt <* fsyncOpt) <|>
                           MinimalPersistence <$> dbdirOpt <|>
                           pure NoPersistence
  where 
    dbdirOpt = strOption (short 'd' <> 
                          long "database-directory" <> 
                          metavar "DIRECTORY" <>
                          showDefaultWith show
                         )
    fsyncOpt = switch (short 'f' <>
                    long "fsync" <>
                    help "Fsync all new transactions.")
               
parseDatabaseName :: Parser DatabaseName
parseDatabaseName = strOption (short 'n' <>
                               long "database" <>
                               metavar "DATABASE_NAME")
                    
parseHostname :: Hostname -> Parser Hostname                    
parseHostname defHostname = strOption (short 'h' <>
                           long "hostname" <>
                           metavar "HOST_NAME" <>
                           value defHostname)
                
parsePort :: Port -> Parser Port                
parsePort defPort = option auto (short 'p' <>
                         long "port" <>
                         metavar "PORT_NUMBER" <>
                         value defPort)
            
parseGhcPkgPaths :: Parser String
parseGhcPkgPaths = strOption (long "ghc-pkg-dir" <>
                              metavar "GHC_PACKAGE_DIRECTORY")
                   
parseTimeout :: Int -> Parser Int              
parseTimeout defTimeout = option auto (long "timeout" <>
                            metavar "MICROSECONDS" <>
                            value defTimeout)

parseConfig :: IO ServerConfig
parseConfig = parseConfigWithDefaults defaultServerConfig
  
parseConfigWithDefaults :: ServerConfig -> IO ServerConfig
parseConfigWithDefaults defaults = execParser (info (parseArgsWithDefaults defaults) idm)