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

module Simplex.Chat.Store.Connections
  ( getConnectionEntity,
  )
where

import Control.Applicative ((<|>))
import Control.Monad.Except
import Data.Int (Int64)
import Data.Maybe (fromMaybe)
import Data.Text (Text)
import Data.Time.Clock (UTCTime (..))
import Database.SQLite.Simple ((:.) (..))
import Database.SQLite.Simple.QQ (sql)
import Simplex.Chat.Store.Files
import Simplex.Chat.Store.Groups
import Simplex.Chat.Store.Shared
import Simplex.Chat.Protocol
import Simplex.Chat.Types
import Simplex.Chat.Types.Preferences
import Simplex.Messaging.Agent.Store.SQLite (firstRow, firstRow')
import qualified Simplex.Messaging.Agent.Store.SQLite.DB as DB

getConnectionEntity :: DB.Connection -> User -> AgentConnId -> ExceptT StoreError IO ConnectionEntity
getConnectionEntity db user@User {userId, userContactId} agentConnId = do
  c@Connection {connType, entityId} <- getConnection_
  case entityId of
    Nothing ->
      if connType == ConnContact
        then pure $ RcvDirectMsgConnection c Nothing
        else throwError $ SEInternalError $ "connection " <> show connType <> " without entity"
    Just entId ->
      case connType of
        ConnMember -> uncurry (RcvGroupMsgConnection c) <$> getGroupAndMember_ entId c
        ConnContact -> RcvDirectMsgConnection c . Just <$> getContactRec_ entId c
        ConnSndFile -> SndFileConnection c <$> getConnSndFileTransfer_ entId c
        ConnRcvFile -> RcvFileConnection c <$> getRcvFileTransfer db user entId
        ConnUserContact -> UserContactConnection c <$> getUserContact_ entId
  where
    getConnection_ :: ExceptT StoreError IO Connection
    getConnection_ = ExceptT $ do
      firstRow toConnection (SEConnectionNotFound agentConnId) $
        DB.query
          db
          [sql|
            SELECT connection_id, agent_conn_id, conn_level, via_contact, via_user_contact_link, via_group_link, group_link_id, custom_user_profile_id,
              conn_status, conn_type, local_alias, contact_id, group_member_id, snd_file_id, rcv_file_id, user_contact_link_id, created_at, security_code, security_code_verified_at, auth_err_counter,
              peer_chat_min_version, peer_chat_max_version
            FROM connections
            WHERE user_id = ? AND agent_conn_id = ?
          |]
          (userId, agentConnId)
    getContactRec_ :: Int64 -> Connection -> ExceptT StoreError IO Contact
    getContactRec_ contactId c = ExceptT $ do
      toContact' contactId c
        <$> DB.query
          db
          [sql|
            SELECT
              c.contact_profile_id, c.local_display_name, p.display_name, p.full_name, p.image, p.contact_link, p.local_alias, c.via_group, c.contact_used, c.enable_ntfs, c.send_rcpts, c.favorite,
              p.preferences, c.user_preferences, c.created_at, c.updated_at, c.chat_ts
            FROM contacts c
            JOIN contact_profiles p ON c.contact_profile_id = p.contact_profile_id
            WHERE c.user_id = ? AND c.contact_id = ? AND c.deleted = 0
          |]
          (userId, contactId)
    toContact' :: Int64 -> Connection -> [(ProfileId, ContactName, Text, Text, Maybe ImageData, Maybe ConnReqContact, LocalAlias, Maybe Int64, Bool) :. (Maybe Bool, Maybe Bool, Bool, Maybe Preferences, Preferences, UTCTime, UTCTime, Maybe UTCTime)] -> Either StoreError Contact
    toContact' contactId activeConn [(profileId, localDisplayName, displayName, fullName, image, contactLink, localAlias, viaGroup, contactUsed) :. (enableNtfs_, sendRcpts, favorite, preferences, userPreferences, createdAt, updatedAt, chatTs)] =
      let profile = LocalProfile {profileId, displayName, fullName, image, contactLink, preferences, localAlias}
          chatSettings = ChatSettings {enableNtfs = fromMaybe True enableNtfs_, sendRcpts, favorite}
          mergedPreferences = contactUserPreferences user userPreferences preferences $ connIncognito activeConn
       in Right Contact {contactId, localDisplayName, profile, activeConn, viaGroup, contactUsed, chatSettings, userPreferences, mergedPreferences, createdAt, updatedAt, chatTs}
    toContact' _ _ _ = Left $ SEInternalError "referenced contact not found"
    getGroupAndMember_ :: Int64 -> Connection -> ExceptT StoreError IO (GroupInfo, GroupMember)
    getGroupAndMember_ groupMemberId c = ExceptT $ do
      firstRow (toGroupAndMember c) (SEInternalError "referenced group member not found") $
        DB.query
          db
          [sql|
            SELECT
              -- GroupInfo
              g.group_id, g.local_display_name, gp.display_name, gp.full_name, gp.description, gp.image, g.host_conn_custom_user_profile_id, g.enable_ntfs, g.send_rcpts, g.favorite, gp.preferences, g.created_at, g.updated_at, g.chat_ts,
              -- GroupInfo {membership}
              mu.group_member_id, mu.group_id, mu.member_id, mu.member_role, mu.member_category,
              mu.member_status, mu.invited_by, mu.local_display_name, mu.contact_id, mu.contact_profile_id, pu.contact_profile_id,
              -- GroupInfo {membership = GroupMember {memberProfile}}
              pu.display_name, pu.full_name, pu.image, pu.contact_link, pu.local_alias, pu.preferences,
              -- from GroupMember
              m.group_member_id, m.group_id, m.member_id, m.member_role, m.member_category, m.member_status,
              m.invited_by, m.local_display_name, m.contact_id, m.contact_profile_id, p.contact_profile_id, p.display_name, p.full_name, p.image, p.contact_link, p.local_alias, p.preferences
            FROM group_members m
            JOIN contact_profiles p ON p.contact_profile_id = COALESCE(m.member_profile_id, m.contact_profile_id)
            JOIN groups g ON g.group_id = m.group_id
            JOIN group_profiles gp USING (group_profile_id)
            JOIN group_members mu ON g.group_id = mu.group_id
            JOIN contact_profiles pu ON pu.contact_profile_id = COALESCE(mu.member_profile_id, mu.contact_profile_id)
            WHERE m.group_member_id = ? AND g.user_id = ? AND mu.contact_id = ?
          |]
          (groupMemberId, userId, userContactId)
    toGroupAndMember :: Connection -> GroupInfoRow :. GroupMemberRow -> (GroupInfo, GroupMember)
    toGroupAndMember c (groupInfoRow :. memberRow) =
      let groupInfo = toGroupInfo userContactId groupInfoRow
          member = toGroupMember userContactId memberRow
       in (groupInfo, (member :: GroupMember) {activeConn = Just c})
    getConnSndFileTransfer_ :: Int64 -> Connection -> ExceptT StoreError IO SndFileTransfer
    getConnSndFileTransfer_ fileId Connection {connId} =
      ExceptT $
        firstRow' (sndFileTransfer_ fileId connId) (SESndFileNotFound fileId) $
          DB.query
            db
            [sql|
              SELECT s.file_status, f.file_name, f.file_size, f.chunk_size, f.file_path, s.file_descr_id, s.file_inline, s.group_member_id, cs.local_display_name, m.local_display_name
              FROM snd_files s
              JOIN files f USING (file_id)
              LEFT JOIN contacts cs USING (contact_id)
              LEFT JOIN group_members m USING (group_member_id)
              WHERE f.user_id = ? AND f.file_id = ? AND s.connection_id = ?
            |]
            (userId, fileId, connId)
    sndFileTransfer_ :: Int64 -> Int64 -> (FileStatus, String, Integer, Integer, FilePath, Maybe Int64, Maybe InlineFileMode, Maybe Int64, Maybe ContactName, Maybe ContactName) -> Either StoreError SndFileTransfer
    sndFileTransfer_ fileId connId (fileStatus, fileName, fileSize, chunkSize, filePath, fileDescrId, fileInline, groupMemberId, contactName_, memberName_) =
      case contactName_ <|> memberName_ of
        Just recipientDisplayName -> Right SndFileTransfer {fileId, fileStatus, fileName, fileSize, chunkSize, filePath, fileDescrId, fileInline, recipientDisplayName, connId, agentConnId, groupMemberId}
        Nothing -> Left $ SESndFileInvalid fileId
    getUserContact_ :: Int64 -> ExceptT StoreError IO UserContact
    getUserContact_ userContactLinkId = ExceptT $ do
      userContact_
        <$> DB.query
          db
          [sql|
            SELECT conn_req_contact, group_id
            FROM user_contact_links
            WHERE user_id = ? AND user_contact_link_id = ?
          |]
          (userId, userContactLinkId)
      where
        userContact_ :: [(ConnReqContact, Maybe GroupId)] -> Either StoreError UserContact
        userContact_ [(cReq, groupId)] = Right UserContact {userContactLinkId, connReqContact = cReq, groupId}
        userContact_ _ = Left SEUserContactLinkNotFound