{-# LANGUAGE CPP #-}
{-# LANGUAGE DuplicateRecordFields #-}
{-# LANGUAGE NamedFieldPuns #-}
{-# LANGUAGE OverloadedStrings #-}
{-# LANGUAGE QuasiQuotes #-}

module Simplex.Chat.Store.Remote where

import Control.Monad.Except
import Data.Int (Int64)
import Data.Text (Text)
import Data.Text.Encoding (decodeASCII, encodeUtf8)
import qualified Data.X509 as X
import Data.Word (Word16)
import Simplex.Chat.Remote.Types
import Simplex.Chat.Store.Shared
import Simplex.Messaging.Agent.Store.AgentStore (firstRow, maybeFirstRow)
import qualified Simplex.Messaging.Agent.Store.DB as DB
import qualified Simplex.Messaging.Crypto as C
import Simplex.Messaging.Encoding.String (StrEncoding (..))
import Simplex.RemoteControl.Types
import UnliftIO
#if defined(dbPostgres)
import Database.PostgreSQL.Simple (Only (..), Query)
import Database.PostgreSQL.Simple.SqlQQ (sql)
#else
import Database.SQLite.Simple (Only (..), Query)
import Database.SQLite.Simple.QQ (sql)
#endif

insertRemoteHost :: DB.Connection -> Text -> FilePath -> Maybe RCCtrlAddress -> Maybe Word16 -> RCHostPairing -> ExceptT StoreError IO RemoteHostId
insertRemoteHost db hostDeviceName storePath rcAddr_ bindPort_ RCHostPairing {caKey, caCert, idPrivKey, knownHost = kh_} = do
  KnownHostPairing {hostFingerprint, hostDhPubKey} <-
    maybe (throwError SERemoteHostUnknown) pure kh_
  checkConstraint SERemoteHostDuplicateCA . liftIO $
    DB.execute
      db
      [sql|
        INSERT INTO remote_hosts
          (host_device_name, store_path, bind_addr, bind_iface, bind_port, ca_key, ca_cert, id_key, host_fingerprint, host_dh_pub)
        VALUES
          (?, ?, ?, ?, ?, ?, ?, ?, ?, ?)
      |]
      (hostDeviceName, storePath, bindAddr_, bindIface_, bindPort_, caKey, C.SignedObject caCert, idPrivKey, hostFingerprint, hostDhPubKey)
  liftIO $ insertedRowId db
  where
    (bindAddr_, bindIface_) = rcCtrlAddressFields_ rcAddr_

getRemoteHosts :: DB.Connection -> IO [RemoteHost]
getRemoteHosts db =
  map toRemoteHost <$> DB.query_ db remoteHostQuery

getRemoteHost :: DB.Connection -> RemoteHostId -> ExceptT StoreError IO RemoteHost
getRemoteHost db remoteHostId =
  ExceptT . firstRow toRemoteHost (SERemoteHostNotFound remoteHostId) $
    DB.query db (remoteHostQuery <> " WHERE remote_host_id = ?") (Only remoteHostId)

getRemoteHostByFingerprint :: DB.Connection -> C.KeyHash -> IO (Maybe RemoteHost)
getRemoteHostByFingerprint db fingerprint =
  maybeFirstRow toRemoteHost $
    DB.query db (remoteHostQuery <> " WHERE host_fingerprint = ?") (Only fingerprint)

remoteHostQuery :: Query
remoteHostQuery =
  [sql|
    SELECT remote_host_id, host_device_name, store_path, ca_key, ca_cert, id_key, host_fingerprint, host_dh_pub, bind_iface, bind_addr, bind_port
    FROM remote_hosts
  |]

toRemoteHost :: (Int64, Text, FilePath, C.APrivateSignKey, C.SignedObject X.Certificate, C.PrivateKeyEd25519, C.KeyHash, C.PublicKeyX25519, Maybe Text, Maybe Text, Maybe Word16) -> RemoteHost
toRemoteHost (remoteHostId, hostDeviceName, storePath, caKey, C.SignedObject caCert, idPrivKey, hostFingerprint, hostDhPubKey, ifaceName_, ifaceAddr_, bindPort_) =
  RemoteHost {remoteHostId, hostDeviceName, storePath, hostPairing, bindAddress_, bindPort_}
  where
    hostPairing = RCHostPairing {caKey, caCert, idPrivKey, knownHost = Just knownHost}
    knownHost = KnownHostPairing {hostFingerprint, hostDhPubKey}
    bindAddress_ = RCCtrlAddress <$> (decodeAddr <$> ifaceAddr_) <*> ifaceName_
    decodeAddr = either (error "Error parsing TransportHost") id . strDecode . encodeUtf8

updateHostPairing :: DB.Connection -> RemoteHostId -> Text -> C.PublicKeyX25519 -> Maybe RCCtrlAddress -> Maybe Word16 -> IO ()
updateHostPairing db rhId hostDeviceName hostDhPubKey rcAddr_ bindPort_ =
  DB.execute
    db
    [sql|
      UPDATE remote_hosts
      SET host_device_name = ?, host_dh_pub = ?, bind_addr = ?, bind_iface = ?, bind_port = ?
      WHERE remote_host_id = ?
    |]
    (hostDeviceName, hostDhPubKey, bindAddr_, bindIface_, bindPort_, rhId)
  where
    (bindAddr_, bindIface_) = rcCtrlAddressFields_ rcAddr_

rcCtrlAddressFields_ :: Maybe RCCtrlAddress -> (Maybe Text, Maybe Text)
rcCtrlAddressFields_ = maybe (Nothing, Nothing) $ \RCCtrlAddress {address, interface} -> (Just . decodeASCII $ strEncode address, Just interface)

deleteRemoteHostRecord :: DB.Connection -> RemoteHostId -> IO ()
deleteRemoteHostRecord db remoteHostId = DB.execute db "DELETE FROM remote_hosts WHERE remote_host_id = ?" (Only remoteHostId)

insertRemoteCtrl :: DB.Connection -> Text -> RCCtrlPairing -> ExceptT StoreError IO RemoteCtrlId
insertRemoteCtrl db ctrlDeviceName RCCtrlPairing {caKey, caCert, ctrlFingerprint, idPubKey, dhPrivKey, prevDhPrivKey} = do
  checkConstraint SERemoteCtrlDuplicateCA . liftIO $
    DB.execute
      db
      [sql|
      INSERT INTO remote_controllers
        (ctrl_device_name, ca_key, ca_cert, ctrl_fingerprint, id_pub, dh_priv_key, prev_dh_priv_key)
      VALUES
        (?, ?, ?, ?, ?, ?, ?)
    |]
      (ctrlDeviceName, caKey, C.SignedObject caCert, ctrlFingerprint, idPubKey, dhPrivKey, prevDhPrivKey)
  liftIO $ insertedRowId db

getRemoteCtrls :: DB.Connection -> IO [RemoteCtrl]
getRemoteCtrls db =
  map toRemoteCtrl <$> DB.query_ db remoteCtrlQuery

getRemoteCtrl :: DB.Connection -> RemoteCtrlId -> ExceptT StoreError IO RemoteCtrl
getRemoteCtrl db remoteCtrlId =
  ExceptT . firstRow toRemoteCtrl (SERemoteCtrlNotFound remoteCtrlId) $
    DB.query db (remoteCtrlQuery <> " WHERE remote_ctrl_id = ?") (Only remoteCtrlId)

getRemoteCtrlByFingerprint :: DB.Connection -> C.KeyHash -> IO (Maybe RemoteCtrl)
getRemoteCtrlByFingerprint db fingerprint =
  maybeFirstRow toRemoteCtrl $
    DB.query db (remoteCtrlQuery <> " WHERE ctrl_fingerprint = ?") (Only fingerprint)

remoteCtrlQuery :: Query
remoteCtrlQuery =
  [sql|
    SELECT remote_ctrl_id, ctrl_device_name, ca_key, ca_cert, ctrl_fingerprint, id_pub, dh_priv_key, prev_dh_priv_key
    FROM remote_controllers
  |]

toRemoteCtrl ::
  ( RemoteCtrlId,
    Text,
    C.APrivateSignKey,
    C.SignedObject X.Certificate,
    C.KeyHash,
    C.PublicKeyEd25519,
    C.PrivateKeyX25519,
    Maybe C.PrivateKeyX25519
  ) ->
  RemoteCtrl
toRemoteCtrl (remoteCtrlId, ctrlDeviceName, caKey, C.SignedObject caCert, ctrlFingerprint, idPubKey, dhPrivKey, prevDhPrivKey) =
  let ctrlPairing = RCCtrlPairing {caKey, caCert, ctrlFingerprint, idPubKey, dhPrivKey, prevDhPrivKey}
   in RemoteCtrl {remoteCtrlId, ctrlDeviceName, ctrlPairing}

updateRemoteCtrl :: DB.Connection -> RemoteCtrl -> Text -> C.PrivateKeyX25519 -> IO ()
updateRemoteCtrl db RemoteCtrl {remoteCtrlId} ctrlDeviceName dhPrivKey =
  DB.execute
    db
    [sql|
      UPDATE remote_controllers
      SET ctrl_device_name = ?, dh_priv_key = ?, prev_dh_priv_key = dh_priv_key
      WHERE remote_ctrl_id = ?
    |]
    (ctrlDeviceName, dhPrivKey, remoteCtrlId)

deleteRemoteCtrlRecord :: DB.Connection -> RemoteCtrlId -> IO ()
deleteRemoteCtrlRecord db remoteCtrlId =
  DB.execute db "DELETE FROM remote_controllers WHERE remote_ctrl_id = ?" (Only remoteCtrlId)