ui: reconnect call (#7711)

* Update Call.hs

* Update Internal.hs

* add reconnecting string

* Update WebRTC.kt

* desktop: show reconnecting state, keep call duration

* android keep connection time correct wiith adding reconnecting

* Update CallTypes.swift add reconnecting status on IOS

* Update WebRTC.swift add reconnecting

* add reconnecting and make sure call duration is correct

* Update call.ts

* core: regenerate call.js from call.ts

* Update Call.hs revert call status change

minimization

* Update Internal.hs rever to minimize changes

* Update CallTypes.swift minimize changes

* Update WebRTC.kt minimize changes

* Update CallView.desktop.kt desktop shows reconnecting without sending to core

* Update CallView.android.kt show reconnecting without sending it to the core

* Update ActiveCallView.swift show reconnecting to ui without sending to core

* Update CallView.desktop.kt add reconnecting sound on reconnect

* Update CallView.android.kt add reconnecting sound

* Update ActiveCallView.swift play reconnecting sound when reconnecting

* Update RecAndPlay.desktop.kt

* rebuild

* refactor

* build

* android, desktop: restart ICE to reconnect calls

* ios: restart ICE to reconnect calls

* webrtc: add call reconnection e2e tests

* android, desktop: fix lost call commands

---------

Co-authored-by: GuavaGoat <320862384+GuavaGoat@users.noreply.github.com>
Co-authored-by: Evgeny Poberezkin <evgeny@poberezkin.com>
Co-authored-by: Evgeny @ SimpleX Chat <259188159+evgeny-simplex@users.noreply.github.com>

apps/multiplatform/spec/api.md

@@ -225,7 +225,7 @@ All functions below are `suspend fun` members of `ChatController` ([SimpleXAPI.k
 | `apiRejectCall` | `rh: Long?, contact: Contact` | Reject an incoming call | [L1854](../common/src/commonMain/kotlin/chat/simplex/common/model/SimpleXAPI.kt#L1854) |
 | `apiSendCallOffer` | `rh, contact, rtcSession, rtcIceCandidates, media, capabilities` | Send a WebRTC call offer | [L1859](../common/src/commonMain/kotlin/chat/simplex/common/model/SimpleXAPI.kt#L1859) |
 | `apiSendCallAnswer` | `rh: Long?, contact: Contact, rtcSession: String, rtcIceCandidates: String` | Send a WebRTC call answer | [L1866](../common/src/commonMain/kotlin/chat/simplex/common/model/SimpleXAPI.kt#L1866) |
-| `apiSendCallExtraInfo` | `rh: Long?, contact: Contact, rtcIceCandidates: String` | Send additional ICE candidates during a call | [L1872](../common/src/commonMain/kotlin/chat/simplex/common/model/SimpleXAPI.kt#L1872) |
+| `apiSendCallExtraInfo` | `rh: Long?, contact: Contact, rtcSession: String?, rtcIceCandidates: String` | Send additional ICE candidates or ICE restart offer/answer during a call | [L2156](../common/src/commonMain/kotlin/chat/simplex/common/model/SimpleXAPI.kt#L2156) |
 | `apiEndCall` | `rh: Long?, contact: Contact` | End an active call | [L1878](../common/src/commonMain/kotlin/chat/simplex/common/model/SimpleXAPI.kt#L1878) |
 | `apiCallStatus` | `rh: Long?, contact: Contact, status: WebRTCCallStatus` | Report call status updates to the core | [L1883](../common/src/commonMain/kotlin/chat/simplex/common/model/SimpleXAPI.kt#L1883) |
 

apps/multiplatform/spec/services/calls.md

@@ -43,6 +43,7 @@ enum class CallState {
   AnswerReceived,      // SDP answer received from peer
   Negotiated,          // ICE negotiation in progress
   Connected,           // Media flowing
+  Reconnecting,        // Connection lost, waiting for ICE to recover
   Ended;               // Call terminated
 }
 ```
@@ -53,6 +54,8 @@ enum class CallState {
 
 State transitions are driven by `WCallResponse` messages from the WebRTC layer. Each transition typically triggers a corresponding API command (e.g., `apiSendCallInvitation`, `apiSendCallOffer`).
 
+**Reconnection**: `Connected` -> `Reconnecting` -> `Connected` or `Ended`. When a connected call loses its WebRTC connection, `call.js` reports `"reconnecting"` connection state instead of ending the call. The app sets `CallState.Reconnecting` and plays the connecting sound; this state is not sent to the core with `apiCallStatus`, so the call item duration is not affected, and `connectedAt` is kept. The party that sent the initial offer (callee) restarts ICE every 10 seconds until reconnected: the restart offer and the answer are sent as `WCallResponse.Ice` / `WCallCommand.Ice` with `session`, via `apiSendCallExtraInfo` (`x.call.extra` with `rtcSession`). If the connection is not restored in 30 seconds, `call.js` reports `"disconnected"` and ends the call.
+
 ---
 
 <a id="ActiveCallView"></a>
@@ -140,7 +143,7 @@ Defined in [`SimpleXAPI.kt`](../../common/src/commonMain/kotlin/chat/simplex/com
 | `apiRejectCall` | [L1854](../../common/src/commonMain/kotlin/chat/simplex/common/model/SimpleXAPI.kt#L1854) | Reject an incoming call |
 | `apiSendCallOffer` | [L1859](../../common/src/commonMain/kotlin/chat/simplex/common/model/SimpleXAPI.kt#L1859) | Send SDP offer with ICE candidates and capabilities |
 | `apiSendCallAnswer` | [L1866](../../common/src/commonMain/kotlin/chat/simplex/common/model/SimpleXAPI.kt#L1866) | Send SDP answer with ICE candidates |
-| `apiSendCallExtraInfo` | [L1872](../../common/src/commonMain/kotlin/chat/simplex/common/model/SimpleXAPI.kt#L1872) | Send additional ICE candidates discovered after initial exchange |
+| `apiSendCallExtraInfo` | [L2156](../../common/src/commonMain/kotlin/chat/simplex/common/model/SimpleXAPI.kt#L2156) | Send additional ICE candidates discovered after initial exchange, or ICE restart offer/answer in `rtcSession` |
 | `apiEndCall` | [L1878](../../common/src/commonMain/kotlin/chat/simplex/common/model/SimpleXAPI.kt#L1878) | Terminate a call |
 | `apiCallStatus` | [L1883](../../common/src/commonMain/kotlin/chat/simplex/common/model/SimpleXAPI.kt#L1883) | Report WebRTC connection status to the backend |