SubMiner/docs/architecture/domains.md

Domain Ownership

Status: active Last verified: 2026-11-01 Owner: Kyle Yasuda Read when: you need to find the owner module for a behavior or test surface

Runtime Domains

• Desktop app runtime: src/main.ts, src/main/, src/core/services/
• Overlay renderer: src/renderer/
• Launcher CLI: launcher/
• mpv plugin: plugin/subminer/

Product / Integration Domains

• Config system: src/config/; Anki resolution is composed by src/config/resolve/anki-connect.ts from focused resolvers in src/config/resolve/anki-connect/ Config hot-reload and the settings window: src/main/assemblies/settings.ts
• App startup: app-ready sequence, headless known-word refresh, overlay startup prerequisites and overlay runtime bootstrap: src/main/assemblies/startup.ts
• Overlay/window state: src/core/services/overlay-*, src/main/overlay-*.ts Overlay windows, visibility, geometry and pointer interaction, Linux fullscreen handling, mpv subtitle suppression while the overlay shows, and the overlay-window IPC handlers (modal open/close, pointer interaction, content measurement): src/main/assemblies/overlay.ts Overlay-hosted modal openers: src/main/assemblies/overlay-modals.ts Windows window tracking: src/window-trackers/windows-tracker.ts queries the target mpv IPC socket for its PID through mpv-process-id.ts, then win32.ts matches native windows by PID. Visible matches are revalidated every 10 seconds; a PID expires after 30 seconds without a successful IPC response. Missing windows retry at one-second intervals. Custom executable names remain supported because matching uses the IPC PID. src/core/services/overlay-visibility-diagnostics.ts watches requested Windows overlays: after five seconds hidden or transparent it logs a warn-level snapshot, repeating at most every 30 seconds. Intentional hiding, minimization and having no mpv answer on the socket yet suppress these warnings; an identified mpv whose window never matches does not. PID lookup failures and native ownership/transparency failures also log at warn, including recovery.
• MPV runtime and protocol: src/core/services/mpv*.ts mpv client creation, mpv event wiring, AniSkip, the autoplay-ready gate that releases mpv's startup pause, managed local subtitle selection, subtitle prefetch, and subtitle sidebar state: src/main/assemblies/playback.ts
• Keyboard input outside the renderer (overlay, global and numeric shortcuts, session bindings): src/main/assemblies/shortcuts.ts
• Session actions (the dispatcher behind shortcuts, controller buttons, CLI commands and plugin actions), the secondary-subtitle mode cycle, and the overlay renderer's mpv commands: src/main/assemblies/session-actions.ts
• System tray: src/main/assemblies/tray.ts
• Yomitan/Hachidori extension loading, parser runtime deps, and dictionary settings windows: src/main/assemblies/yomitan.ts Windows executable lookup and detached process creation are shared in src/main/runtime/mpv-process.ts. The Windows launcher and Jellyfin handlers retain their own playback and connection workflows.
• Subtitle/token pipeline: src/core/services/subtitle-*.ts, src/core/services/tokenizer*, src/core/services/tokenizer/, src/subsync/ JLPT and frequency annotation lookups: src/main/jlpt-runtime.ts, src/main/frequency-dictionary-runtime.ts, assembled by src/main/assemblies/dictionaries.ts Annotation toggles (a cycled runtime option over its config value): src/main/runtime/annotation-options.ts Whisper subtitle generation runtime, modal and IPC: src/main/assemblies/subtitle-generation.ts Subtitle text filters (subtitleFilter): src/shared/subtitle-text-filter.ts. Primary text is filtered at its two entry points, live sub-text in mpv-protocol.ts and parsed cues in playback.ts, so every consumer sees the same text and live/cue matching still works. A config change re-reads sub-text and re-parses the active track (the prefetch controller's parse key).
• First-run setup: src/main/runtime/first-run-setup-*.ts, assembled by src/main/assemblies/first-run-setup.ts
• Anki workflow: src/anki-integration/, src/core/services/anki-jimaku*.ts Card mining handlers, the pending lookup context, field grouping, and media timing review wiring: src/main/assemblies/mining.ts
• Media timing review: src/main/runtime/media-timing-review.ts owns the review and hidden MediaTimingPreviewSession. The session waits for mpv readiness and acknowledges playback commands; its time-pos observations reach the modal through media-timing-review:preview-position. The renderer places the cursor from those timestamps and uses an inactivity timeout instead of timing the clip itself.
• Immersion tracking: src/core/services/immersion-tracker/; tracker startup, the stats server, the stats overlay window options, and the --stats command are assembled by src/main/assemblies/stats.ts Includes stats storage/query schema such as imm_videos, imm_media_art, and imm_youtube_videos for per-video and YouTube-specific library metadata. Library-entry identity aliases and merge recommendations are persisted alongside this schema; the stats HTTP and SPA layers only expose and present those domain decisions. delete-maintenance-scheduler.ts coalesces and serializes stats deletes; the expensive work runs in delete-maintenance-worker-thread.ts while the tracker queues playback writes. Each batch uses one transaction, lexical update, rollup refresh, and incremental lifetime subtraction (planLifetimeRemovals/applyLifetimeRemovals in lifetime.ts). Merges, moves, AniList reassignments, and stats cleanup -l use repairLifetimeSummariesFromMedia (recompute from the per-video media ledger). The full lifetime rebuild survives only as the empty-table bootstrap; anywhere else it would collapse lifetime totals to the session retention window.
• Immersion sync: src/core/services/stats-sync/, bound by src/main/sync-cli.ts. The sync window and auto-sync scheduler live in src/main/assemblies/sync.ts. snapshot-transfer.ts selects compressed rsync or scp. transfer-cache.ts atomically retains the last successfully received snapshot per hashed peer/database identity under the config directory's sync-transfer-cache/. Cache copies seed isolated transfer directories; rsync verifies reconstructed files before the existing merge engine runs. The --make-temp / --remove-temp helpers accept an internal --transfer-cache key, with a fallback for older peers that do not recognize it.
• AniList tracking + character dictionary: src/core/services/anilist/, src/main/runtime/composers/anilist-* (called by src/main/assemblies/anilist.ts), src/main/character-dictionary-runtime.ts, src/main/character-dictionary-runtime/, assembled by src/main/assemblies/character-dictionary.ts
• TMDB live-action metadata: src/core/services/tmdb/ (client + exact-title resolver), src/core/services/immersion-tracker/live-action-link.ts (links an entry to a TMDB title and merges other holders of the same title). The AniList cover-art fetcher calls the resolver as its fallback; imm_anime.media_kind marks the result and keeps the entry out of AniList season repair.
• Jellyfin integration: src/core/services/jellyfin*.ts, src/main/runtime/composers/jellyfin-*, assembled by src/main/assemblies/jellyfin.ts
• YouTube playback, subtitles, media cache, and in-app browser: src/core/services/youtube/, src/main/runtime/youtube-*, assembled by src/main/assemblies/youtube.ts
• User plugins: src/core/services/plugins/ (host, ctx, exec), src/main/runtime/plugin-panel-runtime.ts (panel modal), src/main/runtime/plugin-window-runtime.ts (plugin windows), assembled by src/main/assemblies/plugins.ts; src/renderer/modals/plugin-panel*.ts; examples in assets/plugins/
• Window trackers: src/window-trackers/
• Stats HTTP app: src/core/services/stats-server.ts, with route groups and shared route support in src/core/services/stats-server/
• Stats SPA: stats/
• Public docs site: docs-site/

Shared Contract Entry Points

Automatic mpv keyboard discovery uses the get-mpv-input-bindings IPC request and MpvInputBindingsSnapshot in src/types/session-bindings.ts. src/main/runtime/mpv-input-bindings.ts queries the connected player and preserves configured keys, including disabled entries. src/shared/mpv-input-bindings.ts validates discovered keys and translates browser input. The renderer's handlers/mpv-input-forwarding.ts keeps the session lookup, coalesces asynchronous refreshes, and releases held keys on blur or disposal. Discovered WHEEL_* bindings forward as keypress <key> <notches> (Chromium reports 120 px per notch), which matches mpv's own precise-scroll scaling. MBTN_* buttons forward as held keydown/keyup when mpv binds the button or its _DBL variant, so mpv synthesizes double-clicks itself. Configured keybindings and the built-in right-click pause run first. Forwarding is the only way pointer input reaches mpv on Hyprland, where the overlay cannot be made click-through. handlers/keyboard.ts runs this fallback after SubMiner controls and refreshes on startup, a delayed startup pass, focus, binding reload, and the mpv-input-bindings:changed event. Main sends that event from session-bindings-runtime.ts when mpv's discovered key set changes, including the first discovery after connecting, because the overlay often loads before mpv connects and the compiled session bindings may not change. Discovery does not enter compiled session bindings, the plugin artifact, persistent config, or session help.

The subtitle sidebar consumes parsed cues through SubtitleSidebarSnapshot. Its sourceKey identifies the media and subtitle source so renderer selections are invalidated on source changes, including changes whose cue text and timings are identical. While open, the sidebar polls the cheap SubtitleSidebarPlaybackState (cached time, current line, sourceKey, cuesRevision; no mpv round-trips) every 80 ms for active-cue tracking. It fetches the full snapshot, which resolves the source over mpv IPC and carries every cue plus config, only on open, config reload, a sourceKey/cuesRevision change, and a ~2 s fallback. Native selection and clean clipboard serialization live in src/renderer/modals/subtitle-sidebar-selection.ts. Electron lets standard Copy input reach the renderer, where sidebar selection takes priority over the live-subtitle binding. The preload bridge writes selections through Electron's clipboard API so copying does not depend on Chromium document focus or require activating the overlay window.

• Config + app-state contracts: src/types/config.ts
• Subtitle/token/media annotation contracts: src/types/subtitle.ts
• Runtime/window/controller/Electron bridge contracts: src/types/runtime.ts
• Anki-specific contracts: src/types/anki.ts
• External integration contracts: src/types/integrations.ts
• Runtime-option contracts: src/types/runtime-options.ts
• Settings UI contracts: src/types/settings.ts
• Session-binding contracts: src/types/session-bindings.ts
• Stats HTTP wire contracts: src/types/stats-wire.ts, src/types/stats-http-contract.ts
• Compatibility-only barrel: src/types.ts

Ownership Heuristics

• Runtime wiring or dependency setup: start in src/main/
• Business logic or service behavior: start in src/core/services/
• UI interaction or overlay DOM behavior: start in src/renderer/
• Command parsing or mpv launch flow: start in launcher/
• Shared contract changes: add or edit the narrowest src/types/<domain>.ts entrypoint; only touch src/types.ts for compatibility exports.
• User-facing docs: docs-site/
• Internal process/docs: docs/