-- Copyright 2022 United States Government as represented by the Administrator
-- of the National Aeronautics and Space Administration. All Rights Reserved.
--
-- Disclaimers
--
-- Licensed under the Apache License, Version 2.0 (the "License"); you may
-- not use this file except in compliance with the License. You may obtain a
-- copy of the License at
--
--      https://www.apache.org/licenses/LICENSE-2.0
--
-- Unless required by applicable law or agreed to in writing, software
-- distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
-- WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
-- License for the specific language governing permissions and limitations
-- under the License.
--
-- | CLI interface to the ROSApp subcommand.
module CLI.CommandROSApp
    (
      -- * Direct command access
      command
    , CommandOpts
    , ErrorCode

      -- * CLI
    , commandDesc
    , commandOptsParser
    )
  where

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

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

-- External imports: actions or commands supported
import           Command.ROSApp (ErrorCode)
import qualified Command.ROSApp

-- * Command

-- | Options needed to generate the ROS application.
data CommandOpts = CommandOpts
  { rosAppConditionExpr  :: Maybe String
  , rosAppInputFile    :: Maybe String
  , rosAppTarget       :: String
  , rosAppTemplateDir  :: Maybe String
  , rosAppVarNames     :: Maybe String
  , rosAppVarDB        :: Maybe String
  , rosAppHandlers     :: Maybe String
  , rosAppFormat       :: String
  , rosAppPropFormat   :: String
  , rosAppPropVia      :: Maybe String
  , rosAppTemplateVars :: Maybe String
  , rosAppTestingApps  :: [String]
  , rosAppTestingVars  :: [String]
  }

-- | Create <https://www.ros.org/ Robot Operating System> (ROS) applications
-- that subscribe to obtain necessary data from topics and call Copilot when
-- new data arrives.
--
-- This is just a wrapper around "Command.ROSApp".
command :: CommandOpts -> IO (Result ErrorCode)
command c = Command.ROSApp.command options
  where
    options = Command.ROSApp.CommandOptions
                { Command.ROSApp.commandConditionExpr = rosAppConditionExpr c
                , Command.ROSApp.commandInputFile   = rosAppInputFile c
                , Command.ROSApp.commandTargetDir   = rosAppTarget c
                , Command.ROSApp.commandTemplateDir = rosAppTemplateDir c
                , Command.ROSApp.commandVariables   = rosAppVarNames c
                , Command.ROSApp.commandVariableDB  = rosAppVarDB c
                , Command.ROSApp.commandHandlers    = rosAppHandlers c
                , Command.ROSApp.commandFormat      = rosAppFormat c
                , Command.ROSApp.commandPropFormat  = rosAppPropFormat c
                , Command.ROSApp.commandPropVia     = rosAppPropVia c
                , Command.ROSApp.commandExtraVars   = rosAppTemplateVars c
                , Command.ROSApp.commandTestingApps = appNames
                , Command.ROSApp.commandTestingVars = rosAppTestingVars c
                }

    -- Turn the qualified app names into tuples of package and node name.
    appNames = map splitAppName $ rosAppTestingApps c

    splitAppName name = Command.ROSApp.Node package (drop 1 nodeT)
      where
        (package, nodeT) = break (== ':') name

-- * CLI

-- | ROS command description
commandDesc :: String
commandDesc = "Generate a ROS 2 monitoring package"

-- | Subparser for the @ros@ command, used to generate a Robot Operating System
-- application connected to Copilot monitors.
commandOptsParser :: Parser CommandOpts
commandOptsParser = CommandOpts
  <$> optional
        ( strOption
            (  long "condition-expr"
            <> metavar "EXPRESSION"
            <> help strROSAppConditionExprArgDesc
            )
        )
  <*> optional
        ( strOption
            (  long "input-file"
            <> metavar "FILENAME"
            <> help strROSAppFileNameArgDesc
            )
        )
  <*> strOption
        (  long "app-target-dir"
        <> metavar "DIR"
        <> showDefault
        <> value "ros"
        <> help strROSAppDirArgDesc
        )
  <*> optional
        ( strOption
            (  long "app-template-dir"
            <> metavar "DIR"
            <> help strROSAppTemplateDirArgDesc
            )
        )
  <*> optional
        ( strOption
            (  long "variable-file"
            <> metavar "FILENAME"
            <> help strROSAppVarListArgDesc
            )
        )
  <*> optional
        ( strOption
            (  long "variable-db"
            <> metavar "FILENAME"
            <> help strROSAppVarDBArgDesc
            )
        )
  <*> optional
        ( strOption
            (  long "handlers-file"
            <> metavar "FILENAME"
            <> help strROSAppHandlerListArgDesc
            )
        )
  <*> strOption
        (  long "input-format"
        <> short 'f'
        <> metavar "FORMAT_NAME"
        <> help strROSAppFormatDesc
        <> showDefault
        <> value "fcs"
        )
  <*> strOption
        (  long "prop-format"
        <> short 'p'
        <> metavar "FORMAT_NAME"
        <> help strROSAppPropFormatDesc
        <> showDefault
        <> value "smv"
        )
  <*> optional
        ( strOption
            (  long "parse-prop-via"
            <> metavar "COMMAND"
            <> help strROSAppPropViaDesc
            )
        )
  <*> optional
        ( strOption
            (  long "template-vars"
            <> metavar "FILENAME"
            <> help strROSAppTemplateVarsArgDesc
            )
        )
  <*> many (strOption
              (  long "testing-app"
              <> metavar "package:node"
              <> help strROSAppROSNodesTestingListArgDesc
              )
           )
  <*> many (strOption
              (  long "testing-vars"
              <> metavar "variable_name"
              <> showDefault
              <> help strROSAppHandlerListArgDesc
              )
           )

-- | Argument target directory to ROS app generation command
strROSAppDirArgDesc :: String
strROSAppDirArgDesc = "Target directory"

-- | Argument template directory to ROS app generation command
strROSAppTemplateDirArgDesc :: String
strROSAppTemplateDirArgDesc =
  "Directory holding ROS application source template"

-- | Argument expression to ROS app generation command.
strROSAppConditionExprArgDesc :: String
strROSAppConditionExprArgDesc = "Expression used as guard or trigger condition"

-- | Argument input file to ROS app generation command
strROSAppFileNameArgDesc :: String
strROSAppFileNameArgDesc =
  "File containing input specification"

-- | Argument variable list to ROS app generation command
strROSAppVarListArgDesc :: String
strROSAppVarListArgDesc =
  "File containing list of ROS variables to make accessible"

-- | Argument variable database to ROS app generation command
strROSAppVarDBArgDesc :: String
strROSAppVarDBArgDesc =
  "File containing a DB of known ROS variables"

-- | Argument handler list to ROS app generation command
strROSAppHandlerListArgDesc :: String
strROSAppHandlerListArgDesc =
  "File containing list of Copilot handlers used in the specification"

-- | Format flag description.
strROSAppFormatDesc :: String
strROSAppFormatDesc = "Format of the input file"

-- | Property format flag description.
strROSAppPropFormatDesc :: String
strROSAppPropFormatDesc = "Format of temporal or boolean properties"

-- | External command to pre-process individual properties.
strROSAppPropViaDesc :: String
strROSAppPropViaDesc =
  "Command to pre-process individual properties"

-- | Additional template variable file flag description.
strROSAppTemplateVarsArgDesc :: String
strROSAppTemplateVarsArgDesc =
  "JSON file containing additional variables to expand in template"

-- | Argument packages to tested list to ROS app generation command
strROSAppROSNodesTestingListArgDesc :: String
strROSAppROSNodesTestingListArgDesc =
  "Turn on ROS2 package node during testing"

-- | Argument variables to be tested list to ROS app generation command
strROSAppVarsTestingListArgDesc :: String
strROSAppVarsTestingListArgDesc =
  "Limit random input generation to these variables"