content: -- This file is part of the Wire Server implementation.
  --
  -- Copyright (C) 2022 Wire Swiss GmbH <opensource@wire.com>
  --
  -- This program is free software: you can redistribute it and/or modify it under
  -- the terms of the GNU Affero General Public License as published by the Free
  -- Software Foundation, either version 3 of the License, or (at your option) any
  -- later version.
  --
  -- This program is distributed in the hope that it will be useful, but WITHOUT
  -- ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
  -- FOR A PARTICULAR PURPOSE. See the GNU Affero General Public License for more
  -- details.
  --
  -- You should have received a copy of the GNU Affero General Public License along
  -- with this program. If not, see <https://www.gnu.org/licenses/>.
  
  module Galley.API.MLS.One2One
    ( localMLSOne2OneConversation,
      localMLSOne2OneConversationAsRemote,
      localMLSOne2OneConversationMetadata,
      remoteMLSOne2OneConversation,
      createMLSOne2OneConversation,
    )
  where
  
  import Data.Id as Id
  import Data.Qualified
  import Imports
  import Polysemy
  import Wire.API.Conversation hiding (Member)
  import Wire.API.Conversation.Protocol
  import Wire.API.Conversation.Role
  import Wire.API.Federation.API.Galley
  import Wire.API.MLS.Group.Serialisation qualified as Group
  import Wire.API.MLS.Keys
  import Wire.API.MLS.SubConversation
  import Wire.API.User
  import Wire.ConversationStore
  import Wire.ConversationStore.MLS.Types
  import Wire.StoredConversation
  import Wire.UserList
  
  -- | Construct a local MLS 1-1 'Conversation' between a local user and another
  -- (possibly remote) user.
  localMLSOne2OneConversation ::
    Local UserId ->
    Local ConvId ->
    OwnConversation
  localMLSOne2OneConversation lself (tUntagged -> convId) =
    let members =
          OwnConvMembers
            { cmSelf = defMember (tUntagged lself),
              cmOthers = []
            }
        (metadata, mlsData) = localMLSOne2OneConversationMetadata convId
     in OwnConversation
          { cnvQualifiedId = convId,
            cnvMetadata = metadata,
            cnvMembers = members,
            cnvProtocol = ProtocolMLS mlsData
          }
  
  -- | Construct a 'RemoteConversation' structure for a local MLS 1-1
  -- conversation to be returned to a remote backend.
  localMLSOne2OneConversationAsRemote ::
    Local ConvId ->
    RemoteConversationV2
  localMLSOne2OneConversationAsRemote lcnv =
    let members =
          RemoteConvMembers
            { selfRole = roleNameWireMember,
              others = []
            }
        (metadata, mlsData) = localMLSOne2OneConversationMetadata (tUntagged lcnv)
     in RemoteConversationV2
          { id = tUnqualified lcnv,
            metadata = metadata,
            members = members,
            protocol = ProtocolMLS mlsData
          }
  
  localMLSOne2OneConversationMetadata ::
    Qualified ConvId ->
    (ConversationMetadata, ConversationMLSData)
  localMLSOne2OneConversationMetadata convId =
    let metadata =
          (defConversationMetadata Nothing)
            { cnvmType = One2OneConv
            }
        groupId = Group.newGroupId One2OneConv (fmap Conv convId)
        mlsData =
          ConversationMLSData
            { cnvmlsGroupId = groupId,
              cnvmlsActiveData = Nothing
            }
     in (metadata, mlsData)
  
  -- | Convert an MLS 1-1 conversation returned by a remote backend into a
  -- 'Conversation' to be returned to the client.
  remoteMLSOne2OneConversation ::
    Local UserId ->
    Remote UserId ->
    RemoteMLSOne2OneConversation ->
    (MLSOne2OneConversation MLSPublicKey)
  remoteMLSOne2OneConversation lself rother rc =
    let members =
          OwnConvMembers
            { cmSelf = defMember (tUntagged lself),
              cmOthers = rc.conversation.members.others
            }
        conv =
          OwnConversation
            { cnvQualifiedId = tUntagged (qualifyAs rother rc.conversation.id),
              cnvMetadata = rc.conversation.metadata,
              cnvMembers = members,
              cnvProtocol = rc.conversation.protocol
            }
     in MLSOne2OneConversation
          { conversation = conv,
            publicKeys = rc.publicKeys
          }
  
  -- | Create a new record for an MLS 1-1 conversation in the database and add
  -- the two members to it.
  createMLSOne2OneConversation ::
    (Member ConversationStore r) =>
    Qualified UserId ->
    Qualified UserId ->
    Local MLSConversation ->
    Sem r StoredConversation
  createMLSOne2OneConversation self other lconv = do
    let conv = tUnqualified lconv
    upsertConversation
      (fmap mcId lconv)
      NewConversation
        { metadata = mcMetadata conv,
          users = fmap (,roleNameWireMember) (toUserList lconv [self, other]),
          protocol = BaseProtocolMLSTag,
          groupId = Just conv.mcMLSData.cnvmlsGroupId
        }
  