{-# Language QuasiQuotes #-}

module Fig.Frontend where

import Fig.Prelude

import System.Random (randomRIO)

import Control.Lens (use, (^?), Ixed (..))

import qualified Data.Text as Text
import qualified Data.Text.Lazy as Text.L
import qualified Data.ByteString.Base64 as BS.Base64

import qualified Network.Wai as Wai
import qualified Network.Wai.Middleware.Static as Wai.Static
import qualified Network.Wai.Handler.Warp as Warp

import qualified Web.Scotty as Sc

import Fig.Utils.SExpr
import Fig.Bus.Client
import Fig.Frontend.Utils
import Fig.Frontend.Auth
import Fig.Frontend.State
import qualified Fig.Frontend.DB as DB

server :: Config -> (Text, Text) -> IO ()
server cfg busAddr = do
  log $ "Frontend server running on port " <> tshow cfg.port
  busClient busAddr
    (\cmds -> do
        log "Connected to bus!"
        Warp.run cfg.port =<< app cfg cmds
    )
    (\_ _ -> pure ())
    (pure ())

sexprStr :: Text -> SExpr
sexprStr = SExprString . BS.Base64.encodeBase64 . encodeUtf8

app :: Config -> Commands IO -> IO Wai.Application
app cfg cmds = do
  log "Connecting to database..."
  db <- DB.connect cfg
  log "Connected! Server active."
  st <- stateRef
  Sc.scottyApp do
    Sc.middleware $ Wai.Static.staticPolicy $ Wai.Static.addBase cfg.assetPath
    Sc.get "/api/check" $ authed cfg \auth -> do
      Sc.json @[Text] [auth.id, auth.name]
    Sc.put "/api/buffer" do
      buf <- withState st $ use buffer 
      Sc.text $ Text.L.fromStrict buf
    Sc.get "/api/motd" do
      DB.get db "motd" >>= \case
        Nothing -> Sc.text ""
        Just val -> Sc.text . Text.L.fromStrict $ decodeUtf8 val
    Sc.get "/api/motd" do
      DB.get db "motd" >>= \case
        Nothing -> Sc.text ""
        Just val -> Sc.text . Text.L.fromStrict $ decodeUtf8 val
    Sc.get "/api/catchphrase" do
      let catchphrases =
            [ "vtuber (male)"
            , "man of letters"
            , "cool guy, online"
            , "internet clown man"
            , "professional emacs fan"
            , "web freak"
            , "guy who really likes programming"
            , "i use nixos btw"
            , "(are these funny or cringe or both?)"
            , "haha yay"
            , "Joel"
            ] :: [Text]
      i <- randomRIO (0, length catchphrases - 1)
      case catchphrases ^? ix i of
        Nothing -> Sc.text "man of letters"
        Just val -> Sc.text $ Text.L.fromStrict val
    Sc.get "/api/user/:name" do
      name <- Text.toLower <$> Sc.pathParam "name"
      DB.get db ("user:" <> encodeUtf8 name) >>= \case
        Nothing -> do
          Sc.status status404
          Sc.text "user not found"
        Just val -> Sc.text . Text.L.fromStrict $ decodeUtf8 val
    Sc.post "/api/redeem" do
      me <- Text.toLower <$> Sc.formParam "ayem"
      name <- Sc.formParam "name"
      input <- Sc.formParamMaybe "input"
      liftIO $ cmds.publish [sexp|(frontend redeem incoming)|]
        $ mconcat
          [ [ sexprStr me
            , sexprStr name
            ]
          , maybe [] ((:[]) . sexprStr) input
          ]
      Sc.text "it worked"
    Sc.get "/api/songs" do
      DB.hvals db "songnames" >>= \case
        Nothing -> do
          Sc.status status404
          Sc.text "no sounds found :("
        Just songs -> Sc.text . Text.L.fromStrict . pretty . SExprList @Void $ SExprString . decodeUtf8 <$> songs
    Sc.get "/api/song/:hash" do
      hash <- Sc.pathParam "hash"
      DB.hget db "songnotes" hash >>= \case
        Nothing -> do
          Sc.status status404
          Sc.text "song not found"
        Just val -> Sc.text . Text.L.fromStrict $ decodeUtf8 val
    Sc.get "/api/poke/:name" do
      target <- encodeUtf8 . Text.toLower <$> Sc.pathParam "name"
      inbox <- fromMaybe [] <$> DB.smembers db ("pokeinbox:" <> target)
      Sc.text . Text.L.fromStrict . pretty . SExprList @Void $ sexprStr . decodeUtf8 <$> inbox
    Sc.post "/api/poke/:name" do
      me <- encodeUtf8 . Text.toLower <$> Sc.formParam "ayem"
      target <- encodeUtf8 . Text.toLower <$> Sc.pathParam "name"
      DB.sismember db ("pokeinbox:" <> me) target >>= \case
        True -> do
          log . tshow $ "handshake between " <> me <> " and " <> target <> " complete!"
          DB.srem db ("pokeinbox:" <> target) [me]
          DB.srem db ("pokeinbox:" <> me) [target]
          Sc.text "complete"
        False -> do
          log . tshow $ "partial handshake from " <> me <> " to " <> target
          DB.sadd db ("pokeinbox:" <> target) [me]
          Sc.text "partial"
    Sc.notFound do
      Sc.text "not found"