# TTS Voice Creator Roadmap

This roadmap is ordered by priority. Refactors should be incremental and covered by tests before behavior is changed.

Priority levels:

- **P0 — safety:** prevents crashes, data loss, broken releases, or security incidents.
- **P1 — high impact:** improves memory use, responsiveness, and maintainability.
- **P2 — quality:** improves diagnostics, polish, and long-term operations.

## P0 — Testing, data safety, and resource limits

- [x] Establish a Playwright baseline before large refactors (app shell, bundle, i18n, clone tabs, and Rehearser parsing; installed Chromium supported).
- [ ] Add explicit Docker memory limits where appropriate.
- [ ] Limit upload sizes, temporary files, and concurrent jobs.
- [ ] Use atomic writes for `.meta.json` files.
- [ ] Create automatic backups before bulk deletes, voice moves, and recasts.
- [ ] Add request-size limits, rate limits, and authentication for destructive/API endpoints.

## P1 — Modular frontend architecture

- [ ] Split `audiobook.js`, `rehearser.js`, and `style.css` by responsibility.
- [ ] Replace broad globals with namespaces such as `window.TTVC.audiobook`.
- [ ] Generate `loader.js` and `scripts/minify.mjs` from one module manifest.
- [ ] Add linting and duplicate-function checks.
- [ ] Extract Rehearser voice matching and voice design.
- [ ] Extract Audiobook parsing and casting.
- [ ] Split `style.css` by feature.
- [ ] Do not migrate to TypeScript or rewrite the frontend until behavior is covered by tests.

## P1 — Frontend performance and memory safety

- [ ] Lazy-load Audiobook, Rehearser, Studio, and image-generation modules only when opened.
- [ ] Virtualize or paginate large character and voice tables; render approximately 30–50 visible rows.
- [ ] Cache `/api/voices` with explicit invalidation instead of repeated full scans.
- [ ] Lazy-load profile images and concept art.
- [ ] Update only affected table rows instead of rebuilding entire tables.
- [ ] Add an LRU cache for audio and images and remove old entries automatically.
- [ ] Revoke discarded object URLs with `URL.revokeObjectURL(objectUrl)`.
- [x] Add low-memory mode using `navigator.deviceMemory` where available; shared worker pools cap at two tasks on devices reporting approximately 4 GB RAM or less.
- [ ] Disable image preloading and reduce table/cache sizes on devices with approximately 4 GB RAM.

## P1 — Backend stability and bounded concurrency

- [ ] Introduce background jobs for voice design, transcription, casting, and image generation.
- [ ] Give every job an ID, progress, cancellation, timeout, retry, and idempotency key.
- [ ] Prevent duplicate generation when a user clicks twice.
- [ ] Centralize provider health checks and error handling.
- [ ] Limit concurrency to 1–2 image generations, 1–2 voice generations, and 1 STT request per user.
- [ ] Use bounded server queues.

## P0 — Security

- [ ] Never expose API keys to frontend JavaScript or logs.
- [ ] Validate uploaded filenames and paths.
- [ ] Strictly validate custom URLs to prevent SSRF.
- [ ] Add request-size limits, rate limits, and authentication for destructive/API endpoints.
- [ ] Run containers as non-root with dropped capabilities and read-only filesystems where practical.
- [ ] Isolate Docker socket access behind a minimal privileged service.

## P0 — Data integrity and recovery

- [ ] Validate character sheets and voice metadata with schemas.
- [ ] Add database migrations instead of silently changing record shapes.
- [ ] Use atomic writes for `.meta.json` files.
- [ ] Create automatic backups before bulk deletes, voice moves, and recasts.
- [ ] Store prompt versions and generation history so bad regenerations can be reverted.

## P0 — Testing

### Automated tests

- [ ] Character parsing and phantom-speaker prevention.
- [ ] Voice-matching constraints.
- [ ] Profile-completeness counting.
- [ ] Rating persistence.
- [ ] STT endpoint normalization.
- [ ] ComfyUI workflow submission.
- [ ] API failure and timeout behavior.

### Playwright smoke suite

- [x] Load the app.
- [x] Verify the production bundle loads.
- [x] Verify language switching and Rehearser parsing.
- [x] Verify clone source tabs switch correctly.
- [ ] Open Characters / Cast.
- [ ] Sort the profile column.
- [ ] Hide and show columns.
- [ ] Rate a voice.
- [ ] Start and cancel a generation job.

## P2 — Observability

- [ ] Add structured logs with request and job IDs.
- [ ] Report provider, endpoint, duration, and error reason clearly.
- [ ] Separate health status from “configured”.
- [ ] Add visible job history and retry controls.
- [ ] Avoid logging prompts, API keys, or book contents by default.

## P1 — Resource limits and constrained-device testing

- [ ] Add explicit Docker memory limits, for example `mem_limit: 4g` and `mem_reservation: 1g` where appropriate.
- [ ] Limit upload sizes, temporary files, and concurrent jobs.
- [ ] Test with Chrome DevTools CPU/memory throttling.
- [ ] Test in a VM or container limited to 4 GB RAM.
- [ ] Monitor browser-tab memory, JavaScript heap, DOM-node count, active audio blobs, Docker memory, and temporary disk usage.
- [ ] Add a memory diagnostics page showing browser heap where supported, rendered rows, cache count/size, active jobs, server/container memory, and largest recent operations.