module Fig.Web.Module.User
  ( public
  , secure
  ) where

import Fig.Prelude

import Data.Maybe (mapMaybe)
import qualified Data.Text as Text
import qualified Data.ByteString.Char8 as BS.C8
import qualified Data.Map.Strict as Map
import qualified Data.Aeson as Aeson

import qualified Database.Redis as Redis

import Fig.Web.Utils
import Fig.Web.Types
import Fig.Web.Auth
import qualified Fig.Web.DB as DB

getText :: MonadIO m => DB -> ByteString -> m (Maybe Text)
getText db key = do
  DB.run db (DB.get key) >>= \case
    Nothing -> pure Nothing
    Just v -> pure . eitherToMaybe $ decodeUtf8' v

getTextList :: MonadIO m => DB -> ByteString -> m [Text]
getTextList db key = do
  DB.run db $ DB.smembers key >>= \case
    Nothing -> pure []
    Just xs -> pure $ mapMaybe (eitherToMaybe . decodeUtf8') xs

getTextValuedMap :: MonadIO m => DB -> ByteString -> m (Map.Map Text Text)
getTextValuedMap db key = do
  vs <- Map.toList <$> DB.run db (DB.hgetall key)
  pure . Map.fromList $ flip mapMaybe vs \(k, v) -> do
    tk <- eitherToMaybe $ decodeUtf8' k
    tv <- eitherToMaybe $ decodeUtf8' v
    Just (tk, tv)

getIntegerValuedMap :: MonadIO m => DB -> ByteString -> m (Map.Map Text Integer)
getIntegerValuedMap db key = do
  vs <- Map.toList <$> DB.run db (DB.hgetall key)
  pure . Map.fromList $ flip mapMaybe vs \(k, v) -> do
    tk <- eitherToMaybe $ decodeUtf8' k
    (iv, _) <- BS.C8.readInteger v
    Just (tk, iv)

data UserInfo = UserInfo
  { stats :: Map.Map Text Integer
  , talents :: Map.Map Text Integer
  , properties :: Map.Map Text Text
  , badges :: [Text]
  } deriving Generic
instance Aeson.ToJSON UserInfo 
getUserInfo :: MonadIO m => DB -> ByteString -> m UserInfo
getUserInfo db uid = do
  stats <- getIntegerValuedMap db $ "user:stats:" <> uid
  talents <- getIntegerValuedMap db $ "user:talents:" <> uid
  properties <- getTextValuedMap db $ "user:properties:" <> uid
  badges <- getTextList db $ "user:badges:" <> uid
  pure UserInfo{..}

data TalentInfo = TalentInfo
  { tid :: Text
  , name :: Text
  , desc :: Text
  } deriving Generic
instance Aeson.ToJSON TalentInfo 
getTalentInfo :: MonadIO m => DB -> Text -> m (Maybe TalentInfo)
getTalentInfo db tid = do
  let eid = encodeUtf8 tid
  mres <- DB.run db do
    mnm <- (eitherToMaybe . decodeUtf8' =<<)
      <$> DB.hget "talent:name" eid
    mres <- (eitherToMaybe . decodeUtf8' =<<)
      <$> DB.hget "talent:desc" eid
    pure (mnm, mres)
  case mres of
    (Just name, Just desc) -> pure $ Just TalentInfo{..}
    _ -> pure Nothing

data BadgeInfo = BadgeInfo
  { bid :: Text
  , name :: Text
  , desc :: Text
  , mode :: Text -- either "text" or "icon"
  , text :: Maybe Text -- if mode is text, the text to display
  } deriving (Show, Generic)
instance Aeson.ToJSON BadgeInfo
getBadgeInfoInner :: Text -> Redis.Redis (Maybe BadgeInfo)
getBadgeInfoInner bid = do
  let eid = encodeUtf8 bid
  mres <- do
    mnm <- (eitherToMaybe . decodeUtf8' =<<) <$> DB.hget "badge:name" eid
    mdesc <- (eitherToMaybe . decodeUtf8' =<<) <$> DB.hget "badge:desc" eid
    mmode <- (eitherToMaybe . decodeUtf8' =<<) <$> DB.hget "badge:mode" eid
    pure (mnm, mdesc, mmode)
  case mres of
    (Just name, Just desc, Just mode@"icon") ->
      let text = Nothing in pure $ Just BadgeInfo{..}
    (Just name, Just desc, Just mode) -> do
      text <- (eitherToMaybe . decodeUtf8' =<<) <$> DB.hget "badge:text" eid
      case text of
        Just _ -> pure $ Just BadgeInfo{..}
        _ -> pure Nothing
    _ -> pure Nothing
getBadgeInfo :: MonadIO m => DB -> Text -> m (Maybe BadgeInfo)
getBadgeInfo db bid = DB.run db $ getBadgeInfoInner bid

public :: PublicModule
public a = do
  -- legacy user API
  onGet "/api/user/:name" do
    name <- Text.toLower <$> pathParam "name"
    DB.run a.db (DB.get $ "user:" <> encodeUtf8 name) >>= \case
      Nothing -> do
        status status404
        respondText "user not found"
      Just val -> respondText $ decodeUtf8 val
  -- username to id mapping
  onGet "/api/user-id/:name" do
    name <- pathParam "name"
    getText a.db ("user-id:" <> encodeUtf8 (Text.toLower name)) >>= \case
      Nothing -> do
        status status404
        respondText "username not found"
      Just val -> respondText val
  -- users
  onGet "/api/user/info/:uid" do -- get everything bundled together
    uid <- pathParam "uid"
    info <- getUserInfo a.db uid
    case Map.lookup "name" info.properties of
      Just _ -> respondJSON info
      Nothing -> do
        status status404
        respondText "no such user"
  onGet "/api/user/stats/:uid" do
    uid <- pathParam "uid"
    respondJSON =<< getIntegerValuedMap a.db ("user:stats:" <> uid)
  onGet "/api/user/talents/:uid" do
    uid <- pathParam "uid"
    respondJSON =<< getIntegerValuedMap a.db ("user:talents:" <> uid)
  onGet "/api/user/properties/:uid" do
    uid <- pathParam "uid"
    respondJSON =<< getTextValuedMap a.db ("user:properties:" <> uid)
  onGet "/api/user/badges/:uid" do
    uid <- pathParam "uid"
    bids <- getTextList a.db ("user:badges:" <> uid)
    log $ tshow bids
    binfo <- DB.run a.db $ catMaybes <$> mapM getBadgeInfoInner bids
    log $ tshow binfo
    respondJSON binfo
  onGet "/api/user/avatar/:uid.png" do
    uuidpng <- pathParam "uid.png"
    case Text.stripSuffix ".png" uuidpng of
      Nothing -> do
        status status400
        respondText "malformed user avatar path"
      Just uid -> DB.run a.db (DB.get $ "user:avatar:" <> encodeUtf8 uid) >>= \case
        Nothing -> do
          addHeader "Content-Type" "image/png"
          respondBytes "\137PNG\r\n\SUB\n\NUL\NUL\NUL\rIHDR\NUL\NUL\NUL\STX\NUL\NUL\NUL\STX\b\ACK\NUL\NUL\NULr\182\r$\NUL\NUL\NUL\SOHsRGB\NUL\174\206\FS\233\NUL\NUL\NUL\SUBIDAT\b\153cd``\248\207T)\206\192\192T)\254\159\129\129\225?\NUL\RS\188\EOT#\137b%\ACK\NUL\NUL\NUL\NULIEND\174B`\130"
        Just img -> do
          addHeader "Content-Type" "image/png"
          respondBytes img
  -- talents
  onGet "/api/talents" do
    (names, descs) <- DB.run a.db $ (,)
      <$> DB.hgetall "talent:name"
      <*> DB.hgetall "talent:desc"
    respondJSON $ Map.intersectionWithKey
      (\tid name desc -> TalentInfo{..})
      (Map.fromList $ bimap decodeUtf8 decodeUtf8 <$> Map.toList names)
      (Map.fromList $ bimap decodeUtf8 decodeUtf8 <$> Map.toList descs)
  onGet "/api/talent/:tid" do
    tid <- pathParam "tid"
    getTalentInfo a.db tid >>= \case
      Nothing -> do
        status status404
        respondText "talent not found"
      Just t -> respondJSON t
  onGet "/api/talent/icon/:tid.png" do
    tidpng <- pathParam "tid.png"
    case Text.stripSuffix ".png" tidpng of
      Nothing -> do
        status status400
        respondText "malformed talent icon path"
      Just tid -> DB.run a.db (DB.hget "talent:icon" $ encodeUtf8 tid) >>= \case
        Nothing -> do
          status status404
          respondText "talent not found"
        Just img -> do
          addHeader "Content-Type" "image/png"
          respondBytes img
  -- badges
  onGet "/api/badge/:bid" do
    bid <- pathParam "bid"
    getBadgeInfo a.db bid >>= \case
      Nothing -> do
        status status404
        respondText "badge not found"
      Just b -> respondJSON b
  onGet "/api/badge/icon/:bid.png" do
    bidpng <- pathParam "bid.png"
    case Text.stripSuffix ".png" bidpng of
      Nothing -> do
        status status400
        respondText "malformed badge icon path"
      Just bid -> DB.run a.db (DB.hget "badge:icon" $ encodeUtf8 bid) >>= \case
        Nothing -> do
          status status404
          respondText "badge does not have an icon"
        Just img -> do
          addHeader "Content-Type" "image/png"
          respondBytes img

secure :: SecureModule
secure a = do
  onPost "/api/talent/reset" $ authed a \creds -> do
    let buid = encodeUtf8 creds.twitchId
    let skey = "user:stats:" <> buid
    let tkey = "user:talents:" <> buid
    DB.run a.db do
      DB.hset skey "allocatedtalentpoints" "0"
      DB.del [tkey]
    respondText "talents reset!"
  onPost "/api/talent/:tid/purchase" $ authed a \creds -> do
    tid <- pathParam "tid"
    let buid = encodeUtf8 creds.twitchId
    let skey = "user:stats:" <> buid
    let tkey = "user:talents:" <> buid
    let parseToInt mbs = fromMaybe 0 do
          bs <- mbs
          (iv, _) <- BS.C8.readInteger bs
          pure iv
    (mtp, matp, mprev) <- DB.run a.db $ (,,)
      <$> DB.hget skey "talentpoints"
      <*> DB.hget skey "allocatedtalentpoints"
      <*> DB.hget tkey tid
    let tp = parseToInt mtp
    let atp = parseToInt matp
    let prev = parseToInt mprev
    if atp < tp
      then do
      DB.run a.db do
        DB.hset skey "allocatedtalentpoints" . encodeUtf8 . tshow $ atp + 1
        DB.hset tkey tid . encodeUtf8 . tshow $ prev + 1
      respondText "talent allocated!"
      else do
      status status403
      respondText "no talent points"