{-# LANGUAGE TemplateHaskell #-}

-- | Command handler utilities
module Calamity.Commands.Utils (
  addCommands,
  useConstantPrefix,
  CmdInvokeFailReason (..),
  CtxCommandError (..),
  CommandNotFound (..),
  CommandInvoked (..),
) where

import Calamity.Client.Client
import Calamity.Client.Types
import Calamity.Commands.Dsl
import Calamity.Commands.Types
import Calamity.Metrics.Eff
import Calamity.Types.Model.Channel
import Calamity.Types.Model.Guild.Member (Member)
import Calamity.Types.Model.User (User)
import CalamityCommands.CommandUtils
import qualified CalamityCommands.Context as CC
import qualified CalamityCommands.Error as CC
import qualified CalamityCommands.ParsePrefix as CC
import qualified CalamityCommands.Utils as CC
import Control.Monad
import qualified Data.Text as T
import Data.Typeable
import qualified Polysemy as P
import Optics.TH (makeFieldLabelsNoPrefix)

data CmdInvokeFailReason c
  = NoContext
  | NotFound [T.Text]
  | CommandInvokeError c CC.CommandError

data CtxCommandError c = CtxCommandError
  { forall c. CtxCommandError c -> c
ctx :: c
  , forall c. CtxCommandError c -> CommandError
err :: CC.CommandError
  }
  deriving (Int -> CtxCommandError c -> ShowS
forall c. Show c => Int -> CtxCommandError c -> ShowS
forall c. Show c => [CtxCommandError c] -> ShowS
forall c. Show c => CtxCommandError c -> String
forall a.
(Int -> a -> ShowS) -> (a -> String) -> ([a] -> ShowS) -> Show a
showList :: [CtxCommandError c] -> ShowS
$cshowList :: forall c. Show c => [CtxCommandError c] -> ShowS
show :: CtxCommandError c -> String
$cshow :: forall c. Show c => CtxCommandError c -> String
showsPrec :: Int -> CtxCommandError c -> ShowS
$cshowsPrec :: forall c. Show c => Int -> CtxCommandError c -> ShowS
Show)

data CommandNotFound = CommandNotFound
  { CommandNotFound -> Message
msg :: Message
  , CommandNotFound -> User
user :: User
  , CommandNotFound -> Maybe Member
member :: Maybe Member
  , -- | The groups that were successfully parsed
    CommandNotFound -> [Text]
path :: [T.Text]
  }
  deriving (Int -> CommandNotFound -> ShowS
[CommandNotFound] -> ShowS
CommandNotFound -> String
forall a.
(Int -> a -> ShowS) -> (a -> String) -> ([a] -> ShowS) -> Show a
showList :: [CommandNotFound] -> ShowS
$cshowList :: [CommandNotFound] -> ShowS
show :: CommandNotFound -> String
$cshow :: CommandNotFound -> String
showsPrec :: Int -> CommandNotFound -> ShowS
$cshowsPrec :: Int -> CommandNotFound -> ShowS
Show)

newtype CommandInvoked c = CommandInvoked
  { forall c. CommandInvoked c -> c
ctx :: c
  }
  deriving stock (Int -> CommandInvoked c -> ShowS
forall c. Show c => Int -> CommandInvoked c -> ShowS
forall c. Show c => [CommandInvoked c] -> ShowS
forall c. Show c => CommandInvoked c -> String
forall a.
(Int -> a -> ShowS) -> (a -> String) -> ([a] -> ShowS) -> Show a
showList :: [CommandInvoked c] -> ShowS
$cshowList :: forall c. Show c => [CommandInvoked c] -> ShowS
show :: CommandInvoked c -> String
$cshow :: forall c. Show c => CommandInvoked c -> String
showsPrec :: Int -> CommandInvoked c -> ShowS
$cshowsPrec :: forall c. Show c => Int -> CommandInvoked c -> ShowS
Show)

-- | A default interpretation for 'CC.ParsePrefix' that uses a single constant prefix.
useConstantPrefix :: T.Text -> P.Sem (CC.ParsePrefix Message ': r) a -> P.Sem r a
useConstantPrefix :: forall (r :: [(* -> *) -> * -> *]) a.
Text -> Sem (ParsePrefix Message : r) a -> Sem r a
useConstantPrefix Text
pre = forall (e :: (* -> *) -> * -> *) (r :: [(* -> *) -> * -> *]) a.
FirstOrder e "interpret" =>
(forall (rInitial :: [(* -> *) -> * -> *]) x.
 e (Sem rInitial) x -> Sem r x)
-> Sem (e : r) a -> Sem r a
P.interpret (\case
                                        CC.ParsePrefix Message { Text
$sel:content:Message :: Message -> Text
content :: Text
content } -> forall (f :: * -> *) a. Applicative f => a -> f a
pure ((Text
pre, ) forall (f :: * -> *) a b. Functor f => (a -> b) -> f a -> f b
<$> Text -> Text -> Maybe Text
T.stripPrefix Text
pre Text
content))

-- | Construct commands and groups from a command DSL, then registers an event
-- handler on the bot that manages running those commands.
--
--
-- Returns an action to remove the event handler, and the 'CommandHandler' that was constructed.
--
-- ==== Command Resolution
--
-- To determine if a command was invoked, and if so which command was invoked, the following happens:
--
--     1. 'CalamityCommands.ParsePrefix.parsePrefix' is invoked, if no prefix is found: stop here.
--
--     2. The input is read a word at a time until a matching command is found,
--        fire the \"command-not-found\" event if not.
--
--     3. A 'Calamity.Commands.Context.Context' is built, and the command invoked.
--
-- ==== Custom Events
--
-- This will fire the following events:
--
--     1. 'CtxCommandError'
--
--         Fired when a command returns an error.
--
--     2. 'CommandNotFound'
--
--         Fired when a valid prefix is used, but the command is not found.
--
--     3. 'CommandInvoked'
--
--         Fired when a command is successfully invoked.
--
addCommands :: (BotC r, Typeable c, CommandContext c, P.Members [CC.ParsePrefix Message, CC.ConstructContext (Message, User, Maybe Member) c IO ()] r)
  => P.Sem (DSLState c r) a -> P.Sem r (P.Sem r (), CommandHandler c, a)
addCommands :: forall (r :: [(* -> *) -> * -> *]) c a.
(BotC r, Typeable c, CommandContext c,
 Members
   '[ParsePrefix Message,
     ConstructContext (Message, User, Maybe Member) c IO ()]
   r) =>
Sem (DSLState c r) a -> Sem r (Sem r (), CommandHandler c, a)
addCommands Sem (DSLState c r) a
m = do
  (CommandHandler c
handler, a
res) <- forall (r :: [(* -> *) -> * -> *]) c (m :: * -> *) a x.
(Monad m, MonadFix m, Member (Final m) r) =>
Sem (DSLState m c a r) x -> Sem r (CommandHandler m c a, x)
CC.buildCommands Sem (DSLState c r) a
m
  Sem r ()
remove <- forall (s :: EventType) (r :: [(* -> *) -> * -> *]).
(BotC r, ReactConstraints s) =>
(EHType s -> Sem r ()) -> Sem r (Sem r ())
react @'MessageCreateEvt forall a b. (a -> b) -> a -> b
$ \case
    (Message
msg, Just User
user, Maybe Member
member) -> do
      forall msg (r :: [(* -> *) -> * -> *]).
Member (ParsePrefix msg) r =>
msg -> Sem r (Maybe (Text, Text))
CC.parsePrefix Message
msg forall (m :: * -> *) a b. Monad m => m a -> (a -> m b) -> m b
>>= \case
        Just (Text
prefix, Text
cmd) -> do
          Either (CmdInvokeFailReason c) (c, ())
r <- forall (m :: * -> *) msg c a (r :: [(* -> *) -> * -> *]).
(Monad m, Members '[ConstructContext msg c m a, Embed m] r,
 CommandContext m c a) =>
CommandHandler m c a
-> msg
-> Text
-> Text
-> Sem r (Either (CmdInvokeFailReason c) (c, a))
CC.handleCommands CommandHandler c
handler (Message
msg, User
user, Maybe Member
member) Text
prefix Text
cmd
          case Either (CmdInvokeFailReason c) (c, ())
r of
            Left (CC.CommandInvokeError c
ctx CommandError
e) -> forall (r :: [(* -> *) -> * -> *]).
BotC r =>
CalamityEvent -> Sem r ()
fire forall b c a. (b -> c) -> (a -> b) -> a -> c
. forall a. Typeable a => a -> CalamityEvent
customEvt forall a b. (a -> b) -> a -> b
$ forall c. c -> CommandError -> CtxCommandError c
CtxCommandError c
ctx CommandError
e
            Left (CC.NotFound [Text]
path)            -> forall (r :: [(* -> *) -> * -> *]).
BotC r =>
CalamityEvent -> Sem r ()
fire forall b c a. (b -> c) -> (a -> b) -> a -> c
. forall a. Typeable a => a -> CalamityEvent
customEvt forall a b. (a -> b) -> a -> b
$ Message -> User -> Maybe Member -> [Text] -> CommandNotFound
CommandNotFound Message
msg User
user Maybe Member
member [Text]
path
            Left CmdInvokeFailReason c
CC.NoContext                  -> forall (f :: * -> *) a. Applicative f => a -> f a
pure () -- ignore if context couldn't be built
            Right (c
ctx, ())        -> do
              Counter
cmdInvoke <- forall (r :: [(* -> *) -> * -> *]).
Member MetricEff r =>
Text -> [(Text, Text)] -> Sem r Counter
registerCounter Text
"commands_invoked" [(Text
"name", [Text] -> Text
T.unwords forall a b. (a -> b) -> a -> b
$ forall (m :: * -> *) c a. Command m c a -> [Text]
commandPath (forall (m :: * -> *) c a.
CommandContext m c a =>
c -> Command m c a
CC.ctxCommand c
ctx))]
              forall (f :: * -> *) a. Functor f => f a -> f ()
void forall a b. (a -> b) -> a -> b
$ forall (r :: [(* -> *) -> * -> *]).
Member MetricEff r =>
Int -> Counter -> Sem r Int
addCounter Int
1 Counter
cmdInvoke
              forall (r :: [(* -> *) -> * -> *]).
BotC r =>
CalamityEvent -> Sem r ()
fire forall b c a. (b -> c) -> (a -> b) -> a -> c
. forall a. Typeable a => a -> CalamityEvent
customEvt forall a b. (a -> b) -> a -> b
$ forall c. c -> CommandInvoked c
CommandInvoked c
ctx

        Maybe (Text, Text)
Nothing -> forall (f :: * -> *) a. Applicative f => a -> f a
pure ()
    EHType 'MessageCreateEvt
_ -> forall (f :: * -> *) a. Applicative f => a -> f a
pure ()
  forall (f :: * -> *) a. Applicative f => a -> f a
pure (Sem r ()
remove, CommandHandler c
handler, a
res)

$(makeFieldLabelsNoPrefix ''CmdInvokeFailReason)
$(makeFieldLabelsNoPrefix ''CtxCommandError)
$(makeFieldLabelsNoPrefix ''CommandNotFound)
$(makeFieldLabelsNoPrefix ''CommandInvoked)