{-# LANGUAGE DerivingStrategies #-}
{-# LANGUAGE RecursiveDo #-}

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

import Calamity.Client.Client
import Calamity.Client.Types
import CalamityCommands.CommandUtils
import qualified CalamityCommands.Error as CC
import Calamity.Commands.Dsl
import Calamity.Commands.Types
import Calamity.Metrics.Eff
import Calamity.Types.Model.Channel
import qualified CalamityCommands.Utils as CC
import Control.Monad
import qualified Data.Text as S
import qualified Data.Text.Lazy as L
import GHC.Generics (Generic)
import qualified Polysemy as P
import qualified CalamityCommands.Context as CC
import qualified CalamityCommands.ParsePrefix as CC
import Data.Typeable

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

data CtxCommandError c = CtxCommandError
  { CtxCommandError c -> c
ctx :: c
  , CtxCommandError c -> CommandError
err :: CC.CommandError
  }
  deriving (Int -> CtxCommandError c -> ShowS
[CtxCommandError c] -> ShowS
CtxCommandError c -> String
(Int -> CtxCommandError c -> ShowS)
-> (CtxCommandError c -> String)
-> ([CtxCommandError c] -> ShowS)
-> Show (CtxCommandError c)
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
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-> (forall x. Rep (CtxCommandError c) x -> CtxCommandError c)
-> Generic (CtxCommandError c)
forall x. Rep (CtxCommandError c) x -> CtxCommandError c
forall x. CtxCommandError c -> Rep (CtxCommandError c) x
forall a.
(forall x. a -> Rep a x) -> (forall x. Rep a x -> a) -> Generic a
forall c x. Rep (CtxCommandError c) x -> CtxCommandError c
forall c x. CtxCommandError c -> Rep (CtxCommandError c) x
$cto :: forall c x. Rep (CtxCommandError c) x -> CtxCommandError c
$cfrom :: forall c x. CtxCommandError c -> Rep (CtxCommandError c) x
Generic)

data CommandNotFound = CommandNotFound
  { CommandNotFound -> Message
msg :: Message
  , -- | The groups that were successfully parsed
    CommandNotFound -> [Text]
path :: [L.Text]
  }
  deriving (Int -> CommandNotFound -> ShowS
[CommandNotFound] -> ShowS
CommandNotFound -> String
(Int -> CommandNotFound -> ShowS)
-> (CommandNotFound -> String)
-> ([CommandNotFound] -> ShowS)
-> Show CommandNotFound
forall a.
(Int -> a -> ShowS) -> (a -> String) -> ([a] -> ShowS) -> Show a
showList :: [CommandNotFound] -> ShowS
$cshowList :: [CommandNotFound] -> ShowS
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showsPrec :: Int -> CommandNotFound -> ShowS
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forall x. Rep CommandNotFound x -> CommandNotFound
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$cto :: forall x. Rep CommandNotFound x -> CommandNotFound
$cfrom :: forall x. CommandNotFound -> Rep CommandNotFound x
Generic)

newtype CommandInvoked c = CommandInvoked
  { CommandInvoked c -> c
ctx :: c
  }
  deriving stock (Int -> CommandInvoked c -> ShowS
[CommandInvoked c] -> ShowS
CommandInvoked c -> String
(Int -> CommandInvoked c -> ShowS)
-> (CommandInvoked c -> String)
-> ([CommandInvoked c] -> ShowS)
-> Show (CommandInvoked c)
forall c. Show c => Int -> CommandInvoked c -> ShowS
forall c. Show c => [CommandInvoked c] -> ShowS
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showList :: [CommandInvoked c] -> ShowS
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forall x. CommandInvoked c -> Rep (CommandInvoked c) x
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Generic)

-- | A default interpretation for 'CC.ParsePrefix' that uses a single constant prefix.
useConstantPrefix :: L.Text -> P.Sem (CC.ParsePrefix Message ': r) a -> P.Sem r a
useConstantPrefix :: Text -> Sem (ParsePrefix Message : r) a -> Sem r a
useConstantPrefix pre :: Text
pre = (forall x (rInitial :: EffectRow).
 ParsePrefix Message (Sem rInitial) x -> Sem r x)
-> Sem (ParsePrefix Message : r) a -> Sem r a
forall (e :: (* -> *) -> * -> *) (r :: EffectRow) a.
FirstOrder e "interpret" =>
(forall x (rInitial :: EffectRow). e (Sem rInitial) x -> Sem r x)
-> Sem (e : r) a -> Sem r a
P.interpret (\case
                                        CC.ParsePrefix Message { content } -> Maybe (Text, Text) -> Sem r (Maybe (Text, Text))
forall (f :: * -> *) a. Applicative f => a -> f a
pure ((Text
pre, ) (Text -> (Text, Text)) -> Maybe Text -> Maybe (Text, Text)
forall (f :: * -> *) a b. Functor f => (a -> b) -> f a -> f b
<$> Text -> Text -> Maybe Text
L.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 c IO ()] r)
  => P.Sem (DSLState c r) a -> P.Sem r (P.Sem r (), CommandHandler c, a)
addCommands :: Sem (DSLState c r) a -> Sem r (Sem r (), CommandHandler c, a)
addCommands m :: Sem (DSLState c r) a
m = do
  (handler :: CommandHandler c
handler, res :: a
res) <- Sem (DSLState c r) a -> Sem r (CommandHandler c, a)
forall (r :: EffectRow) 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 (r :: EffectRow).
(BotC r, ReactConstraints 'MessageCreateEvt) =>
(EHType 'MessageCreateEvt -> Sem r ()) -> Sem r (Sem r ())
forall (s :: EventType) (r :: EffectRow).
(BotC r, ReactConstraints s) =>
(EHType s -> Sem r ()) -> Sem r (Sem r ())
react @'MessageCreateEvt ((EHType 'MessageCreateEvt -> Sem r ()) -> Sem r (Sem r ()))
-> (EHType 'MessageCreateEvt -> Sem r ()) -> Sem r (Sem r ())
forall a b. (a -> b) -> a -> b
$ \msg :: EHType 'MessageCreateEvt
msg -> do
    Message -> Sem r (Maybe (Text, Text))
forall msg (r :: EffectRow).
MemberWithError (ParsePrefix msg) r =>
msg -> Sem r (Maybe (Text, Text))
CC.parsePrefix Message
EHType 'MessageCreateEvt
msg Sem r (Maybe (Text, Text))
-> (Maybe (Text, Text) -> Sem r ()) -> Sem r ()
forall (m :: * -> *) a b. Monad m => m a -> (a -> m b) -> m b
>>= \case
      Just (prefix :: Text
prefix, cmd :: Text
cmd) -> do
        Either (CmdInvokeFailReason c) (c, ())
r <- CommandHandler c
-> Message
-> Text
-> Text
-> Sem r (Either (CmdInvokeFailReason c) (c, ()))
forall (m :: * -> *) msg c a (r :: EffectRow).
(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
EHType 'MessageCreateEvt
msg Text
prefix Text
cmd
        case Either (CmdInvokeFailReason c) (c, ())
r of
          Left (CC.CommandInvokeError ctx :: c
ctx e :: CommandError
e) -> CalamityEvent -> Sem r ()
forall (r :: EffectRow). BotC r => CalamityEvent -> Sem r ()
fire (CalamityEvent -> Sem r ())
-> (CtxCommandError c -> CalamityEvent)
-> CtxCommandError c
-> Sem r ()
forall b c a. (b -> c) -> (a -> b) -> a -> c
. CtxCommandError c -> CalamityEvent
forall a. Typeable a => a -> CalamityEvent
customEvt (CtxCommandError c -> Sem r ()) -> CtxCommandError c -> Sem r ()
forall a b. (a -> b) -> a -> b
$ c -> CommandError -> CtxCommandError c
forall c. c -> CommandError -> CtxCommandError c
CtxCommandError c
ctx CommandError
e
          Left (CC.NotFound path :: [Text]
path)            -> CalamityEvent -> Sem r ()
forall (r :: EffectRow). BotC r => CalamityEvent -> Sem r ()
fire (CalamityEvent -> Sem r ())
-> (CommandNotFound -> CalamityEvent)
-> CommandNotFound
-> Sem r ()
forall b c a. (b -> c) -> (a -> b) -> a -> c
. CommandNotFound -> CalamityEvent
forall a. Typeable a => a -> CalamityEvent
customEvt (CommandNotFound -> Sem r ()) -> CommandNotFound -> Sem r ()
forall a b. (a -> b) -> a -> b
$ Message -> [Text] -> CommandNotFound
CommandNotFound Message
EHType 'MessageCreateEvt
msg [Text]
path
          Left CC.NoContext                  -> () -> Sem r ()
forall (f :: * -> *) a. Applicative f => a -> f a
pure () -- ignore if context couldn't be built
          Right (ctx :: c
ctx, ())        -> do
            Counter
cmdInvoke <- Text -> [(Text, Text)] -> Sem r Counter
forall (r :: EffectRow).
MemberWithError MetricEff r =>
Text -> [(Text, Text)] -> Sem r Counter
registerCounter "commands_invoked" [("name", [Text] -> Text
S.unwords ([Text] -> Text) -> [Text] -> Text
forall a b. (a -> b) -> a -> b
$ Command IO c () -> [Text]
forall (m :: * -> *) c a. Command m c a -> [Text]
commandPath (c -> Command IO c ()
forall (m :: * -> *) c a.
CommandContext m c a =>
c -> Command m c a
CC.ctxCommand c
ctx))]
            Sem r Int -> Sem r ()
forall (f :: * -> *) a. Functor f => f a -> f ()
void (Sem r Int -> Sem r ()) -> Sem r Int -> Sem r ()
forall a b. (a -> b) -> a -> b
$ Int -> Counter -> Sem r Int
forall (r :: EffectRow).
MemberWithError MetricEff r =>
Int -> Counter -> Sem r Int
addCounter 1 Counter
cmdInvoke
            CalamityEvent -> Sem r ()
forall (r :: EffectRow). BotC r => CalamityEvent -> Sem r ()
fire (CalamityEvent -> Sem r ())
-> (CommandInvoked c -> CalamityEvent)
-> CommandInvoked c
-> Sem r ()
forall b c a. (b -> c) -> (a -> b) -> a -> c
. CommandInvoked c -> CalamityEvent
forall a. Typeable a => a -> CalamityEvent
customEvt (CommandInvoked c -> Sem r ()) -> CommandInvoked c -> Sem r ()
forall a b. (a -> b) -> a -> b
$ c -> CommandInvoked c
forall c. c -> CommandInvoked c
CommandInvoked c
ctx
      Nothing -> () -> Sem r ()
forall (f :: * -> *) a. Applicative f => a -> f a
pure ()
  (Sem r (), CommandHandler c, a)
-> Sem r (Sem r (), CommandHandler c, a)
forall (f :: * -> *) a. Applicative f => a -> f a
pure (Sem r ()
remove, CommandHandler c
handler, a
res)