# Direct Call Domain

Direct calls coordinate private voice sessions started from people cards, direct-message headers, or active-call rail icons. The domain owns call session state and call-control events; media capture, camera, screen sharing, playback, and voice activity stay in the existing voice and screen-share domains.

## Flow

1. `DirectCallService.startCall()` creates or reuses the direct-message conversation for a peer, while `startConversationCall()` starts from an existing one-to-one or group conversation. Both paths reuse a live call for the same peer or group before creating a new session.
2. The caller joins a call-scoped voice session and sends a `direct-call` ring event through `PeerDeliveryService`. Joining a direct call first leaves any other joined call or server voice channel.
3. The caller and recipient both record a direct-message `call-started` system entry for the call's conversation, so the chat history shows who started the call without creating a normal text message.
4. The recipient stores the incoming session, loops `assets/audio/call.wav`, shows an in-app answer/decline modal, and shows a desktop notification when permission allows. If the recipient is set to Do Not Disturb (`status: "busy"`), the session is stored silently without call audio, the in-app modal, or a desktop notification. Ring events received before the current user identity is hydrated are queued and replayed once identity is available. The ring stops when the recipient joins, declines, leaves, or the call ends; stale duplicate ring events for a locally ended call are ignored.
5. Opening `/call/:callId` shows the private call surface with portraits, voice indicators, media controls (mute, deafen, camera, screen share), screen/camera tiles, add-user control, and a narrow DM chat panel. Deafen mutes incoming audio and also mutes the local mic, matching voice-channel behavior.
6. If a third participant is invited, the call creates a fresh empty group conversation and switches the call chat panel to it. Existing one-to-one messages stay in the original PM and are not copied into the group chat.
7. Starting a call from a group chat uses the group conversation id as the call id and rings every other participant.
8. Joining, leaving, ending, participant additions, and call chat conversion updates are mirrored as `direct-call` events over the same P2P/signaling fallback path used by direct messages.
9. The server rail shows call icons only while at least one participant is joined. If a user is viewing a private call after the session ends, the route returns to the call's chat view.

Incoming `direct-call` events are ignored unless the current user is declared in the event's `participantIds` or participant profiles, so only invited PM/group-call participants can receive call audio, the in-app incoming-call modal, or a desktop ring notification.

Two-person calls use the one-to-one direct-message conversation id as their call id. Converted group calls keep the original call id for media routing but point `conversationId` at the new group chat so active streams stay connected while the chat history boundary changes.