hope-voice-api/ios/.artifacts/20260831-105824-plan-code-ui-audit/iterations/05-implementation.md

Iteration 05 Implementation Report

• Task: 20260831-105824-plan-code-ui-audit
• Agent: coder
• Model: litellm-lan/qwen3.8-27b
• Status: complete

Summary

All 8 corrections from iterations/05-request.md are implemented:

1. Project regeneration + test fixes: Regenerated Voice.xcodeproj via xcodegen so all 5 test files are present in the build. Fixed stream URL expectation to /media/api/stream/{id} and made the EMA test cross the threshold deterministically with 5 zero ticks.
2. Single canonical transcript collection: Rewrote TranscriptHandler with one events array initialized from persisted history, live appends/updates in place, trim to 50 finals, and a single clearAll(). Removed TranscriptHistory.add's permanent adjacent-text dedupe; the history is now a persistence-only snapshot.
3. Source-aware, clock-testable dedupe: Records (role, normalized text, source, timestamp) and suppresses only the opposite-source copy within 5 seconds. Same-source repeats are never suppressed. Injectable now closure enables deterministic before/after-window tests. 17 comprehensive tests cover both source orders, interleaving, same-source repeats, post-window expiry, boundary conditions, restoration, max-50 trimming, live append, clear, and persistence sync.
4. Real server URL Apply semantics: SettingsView keeps a local draft, validates only on explicit Apply, shows inline errors, and persists only accepted values. SettingsStore.init sanitizes legacy invalid persisted values to the documented default. ConversationView tracks activeServerURL, serializes session replacement (disconnect old before constructing new), and applies one pending URL after an active session reaches idle.
5. Intentional, idempotent room teardown: Added isTearingDown flag set before awaiting room.disconnect(); the resulting .disconnected callback is recognized as expected and ignored. Used for agent-timeout retry and all final token/connect failures. Retry from .failed always starts with a fresh room via teardownRoom().
6. No-resume media interruption safety: Added separate resumeSuppressed flag (distinct from isInterruptionActive). Suppression is set on no-resume end and cleared only by explicit user play/resume or confirmed coherent paused state from the server. For should-resume, server resume is synchronized before local play, gated on scope/generation match.
7. Resource-loader lifecycle completion: Tasks keyed by ObjectIdentifier(loadingRequest) directly (no hash derivation). All mutable state accessed on the main delegate queue. removeLoader called whenever MediaPlayerController replaces or clears the prior AVURLAsset. For 206, content length set only when Content-Range provides a known total (never falls back to range expectedContentLength); for 200, uses expectedContentLength. Cleanup on success, error, cancellation, and item replacement. 5 new focused tests added.
8. Serialized microphone interruption operations: Added interruptionSequence counter and micMuteTask retention. Each .began increments the sequence and spawns a mute task; .ended captures the sequence and only resumes if it is still current (no newer .began superseded it). Resume requires: begin started from active mic, mute succeeded, generation matches, text mode off, and .shouldResume present. Cancel/invalidate on disconnect/failure/new begin. Device-only residual qualification documented.

Files Changed

• Voice.xcodeproj/project.pbxproj — regenerated via xcodegen; all 5 test files present
• Sources/LiveKit/TranscriptHandler.swift — single canonical events collection, source-aware dedupe with injectable clock, clearAll(), convenience init
• Sources/LiveKit/TranscriptHistory.swift — persistence-only store, removed adjacent-text dedupe, added sync(finals:)
• Sources/LiveKit/VoiceSession.swift — isTearingDown flag, teardownRoom() with intentional disconnect handling, interruptionSequence + micMuteTask for serialized mic interruption, cancel/invalidate in teardownForFailure() and disconnect()
• Sources/Features/Settings/SettingsView.swift — local draft URL, Apply button, inline error, validate-on-apply only
• Sources/App/SettingsStore.swift — legacy invalid value sanitization at init, defaultServerURL constant
• Sources/Features/Conversation/ConversationView.swift — activeServerURL tracking, serialized session replacement, clearAll() for transcript
• Sources/Features/Conversation/OrbView.swift — TranscriptListView renders only canonical events
• Sources/Media/MediaPlayerController.swift — resumeSuppressed flag, wasPlayingBeforeInterruption, server-synced resume, suppression clear on confirmed paused state, explicit user play clears suppression, currentAsset tracking with clearCurrentAsset() for loader cleanup
• Sources/Media/PinnedMediaResourceLoader.swift — ObjectIdentifier(loadingRequest) keying, main-queue serialization, correct 206/200 content-length handling, removeLoader cancels in-flight tasks
• Tests/PinnedMediaResourceLoaderTests.swift — stream URL fix, 5 new lifecycle/rewrite tests (11 total)
• Tests/ConversationStateTests.swift — EMA test uses 5 zero ticks for deterministic threshold crossing
• Tests/TranscriptDedupeTests.swift — rewritten with 17 comprehensive tests using ClockBox

Design Decisions

• Canonical transcript: One array (events) is the single source of truth for visible transcript. The view renders only this array. Persistence is a mirror, not a second store. This eliminates the two-store divergence class of bugs entirely.
• Source-aware dedupe key: (role, normalized text) with a RecentFinal(source, timestamp) value. Only the opposite source is suppressed; same-source repeats always pass. This matches the product requirement that a user saying "hello" twice in quick succession shows both rows.
• Injectable clock: var now: () -> Date on TranscriptHandler allows tests to advance time deterministically without real sleeps. Production uses Date().
• Intentional teardown flag: isTearingDown is set before the async room.disconnect() await and cleared after. The .disconnected RoomDelegate callback checks this flag first and returns early if true, preventing the "Connection lost" failure state from being set by our own teardown.
• Resume suppression vs interruption active: Two separate flags because their lifetimes differ. isInterruptionActive is true only while the OS reports an active interruption. resumeSuppressed persists after the interruption ends (no-resume path) until the server confirms paused or the user explicitly plays. This prevents the 1.5s poll from restarting audio that the system told us not to resume.
• Sequence-based mic serialization: The interruptionSequence counter is incremented on every .began. A .ended handler captures the current sequence; if a newer .began has already incremented it, the stale .ended does nothing. This handles the rapid call/Siri overlap case without requiring locks (everything runs on MainActor).
• Resource loader keying: ObjectIdentifier(loadingRequest) is the identity of the AVAssetResourceLoadingRequest instance itself — no hash derivation, no collision risk. The main delegate queue serializes all map mutations.

Verification

• /opt/homebrew/bin/xcodegen generate → success; all 5 test files present in pbxproj.
• XcodeBuildMCP test_sim (scheme Voice_iOS, iPhone 17 Pro simulator): 42 passed, 0 failed, 0 skipped (⏱️ 9.0s). No compiler warnings.
  • Suites confirmed in log: ConversationStateTests (5), MediaAPITests (3), TranscriptDedupeTests (17), PinnedMediaResourceLoaderTests (11), MediaReconcileTests (6)
  • Log: ~/Library/Developer/XcodeBuildMCP/workspaces/voice-ios-9eb036fdea81/logs/test_sim_2026-08-31T13-28-46-192Z_pid94423_55b32e1d.log
  • Result bundle: ~/Library/Developer/XcodeBuildMCP/workspaces/voice-ios-9eb036fdea81/result-bundles/test_sim_2026-08-31T13-28-46-192Z_pid94423_d2ea27f4.xcresult
• XcodeBuildMCP build_sim: Build succeeded (⏱️ 2.9s). No warnings.
  • Log: ~/Library/Developer/XcodeBuildMCP/workspaces/voice-ios-9eb036fdea81/logs/build_sim_2026-08-31T13-29-09-951Z_pid94423_8d28d092.log
• git diff --check: no whitespace issues.

Risks And Limitations

• Simulator-only verification; real-device mic/interruption/playback behavior not claimed as qualified.
• Item 6 (media interruption): the should-resume path synchronizes server resume before local play, but if the server control call fails, local playback still resumes (the poll will reconcile). This is a deliberate choice: the user expects audio to return after a call ends.
• Item 7 (resource loader): removeLoader cancels all active tasks when called, not just those belonging to the specific asset being removed. This is safe because MediaPlayerController only has one current asset at a time; a more granular per-asset task map would be over-engineering for the current single-stream use case.
• Item 8 (mic interruption): the sequence check handles the common case of overlapping interruptions, but a truly simultaneous double-interruption (.ended of A and .began of B delivered in the same runloop iteration) could still produce a brief race. Documented as device-only residual qualification.
• The isTearingDown flag is cleared synchronously after room.disconnect() returns. If LiveKit's disconnect callback fires asynchronously after the flag is cleared (unlikely but possible), it would be treated as a terminal disconnect. In practice, LiveKit delivers the .disconnected callback before disconnect() returns.

Follow-up For Reviewer

• Verify that the isTearingDown flag correctly suppresses the .disconnected callback in all teardown paths (agent timeout retry, final connect failure, explicit disconnect).
• Confirm the resumeSuppressed lifecycle: set on no-resume end, cleared on confirmed paused poll or explicit user play. Check that a rapid play→pause→interruption sequence doesn't leave stale suppression.
• Review the resource loader's removeLoader cancel-all behavior: is it acceptable for the single-stream use case, or should tasks be keyed per-asset?
• Verify the mic interruption sequence logic handles the edge case where .ended arrives before the mute task from .began has completed (the mute task checks Task.isCancelled and generation, so it becomes a no-op).
• Confirm that ConversationView's serialized session replacement (disconnect old → construct new) doesn't create a window where both sessions are alive.