generated from john/python-template
Step 5 implementation plan
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Jim Lancaster
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## Step 5: `app.py` + UI Pages (NiceGUI + FastAPI composition)
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## Objective
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Implement the MVP user-facing application layer so users can:
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1. Upload a document from the UI
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2. Trigger Step 4 upload/job creation flow
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3. See live job lifecycle status (`queued`, `processing`, `transcribed`, `failed`)
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4. Open a job detail view to read transcript text or failure details
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This step composes Steps 1–4 into a usable UI.
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---
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## Architecture Summary (NiceGUI-aligned)
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Step 5 uses a **FastAPI app factory + lifespan orchestration** and mounts/registers NiceGUI pages via explicit page modules.
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### Core architecture decisions
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- **App factory:** `create_app()`
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- **Lifespan-managed resources:** worker start/stop managed in startup/shutdown
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- **Modular pages:** upload and jobs pages in separate modules (no monolithic UI file)
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- **Health endpoint:** FastAPI-side `/healthz`
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- **Dependency direction (one-way):**
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- `app` -> `config/logging/db/worker/ui/api`
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- `ui/pages` -> `services`
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- `services` -> `db/models/providers`
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- no reverse imports from services into UI/API
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### DB and AI stance (explicit)
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- **DB:** already enabled (SQLModel + SQLite), session lifecycle remains request/service-scoped as built in prior steps.
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- **AI workflow:** already in place via Step 3 transcription service + Step 4 worker; UI does not call provider SDK directly.
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---
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## Scope
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### In scope
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- `src/transcription/app.py`
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- `src/transcription/ui/upload_page.py`
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- `src/transcription/ui/jobs_page.py`
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- `src/transcription/ui/__init__.py`
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- `src/transcription/api/health.py` (or equivalent FastAPI health route module)
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- UI/app tests with MCP scaffold->fill flow
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### Out of scope
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- Auth
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- advanced filtering/search UX
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- batch upload UX beyond MVP
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- deployment/container hardening
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---
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## Planned Deliverables
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### Source files
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- `src/transcription/app.py` (app factory + lifespan wiring)
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- `src/transcription/api/health.py` (GET `/healthz`)
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- `src/transcription/ui/upload_page.py` (upload flow)
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- `src/transcription/ui/jobs_page.py` (status list + detail)
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- `src/transcription/ui/__init__.py` (explicit `register_pages(...)` export)
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### Test files
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- `tests/test_app.py`
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- `tests/api/test_health.py`
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- `tests/ui/test_pages_registration.py`
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- `tests/ui/test_upload_page.py`
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- `tests/ui/test_jobs_page.py`
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---
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## Implementation Plan + Checklist
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## Phase A — App factory and lifespan orchestration
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- [ ] Create `create_app()` in `src/transcription/app.py`
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- [ ] Add FastAPI lifespan startup/shutdown handlers
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- [ ] Startup responsibilities:
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- [ ] `setup_logging()`
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- [ ] `create_all()`
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- [ ] ensure directories exist (`upload_dir`, `prompt_dir`)
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- [ ] create worker stop event
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- [ ] start worker background thread/task
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- [ ] Shutdown responsibilities:
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- [ ] signal stop event
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- [ ] join/cleanup worker thread/task cleanly
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- [ ] Register API router(s), including health route
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- [ ] Register NiceGUI pages via explicit page registration function
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## Phase B — FastAPI health endpoint
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- [ ] Create `src/transcription/api/health.py`
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- [ ] Add `GET /healthz` returning simple healthy payload
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- [ ] Wire route into app factory
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## Phase C — Upload page (`ui/upload_page.py`)
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- [ ] Add upload route/page registration function
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- [ ] Render file input accepting supported extensions
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- [ ] On submit:
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- [ ] show loading/progress state
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- [ ] call `create_upload_job(filename, file_bytes, ...)`
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- [ ] show success state with job reference/link
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- [ ] On error:
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- [ ] show user-safe error message
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- [ ] restore ready UI state
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- [ ] Ensure no blocking calls in UI event handlers beyond bounded service interaction
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## Phase D — Jobs page (`ui/jobs_page.py`)
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- [ ] Add jobs list route/page registration function
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- [ ] Display jobs with status + timestamps
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- [ ] Add job detail route/view
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- [ ] Show transcript on success, error detail on failure
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- [ ] Include explicit refresh action and loading state
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- [ ] Ensure error states are surfaced to user and logged
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## Phase E — UI registration module
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- [ ] Update `src/transcription/ui/__init__.py`
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- [ ] Export `register_pages(...)`
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- [ ] Ensure each page module exports `register_page(...)`
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- [ ] Keep page registration explicit and modular
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---
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## MCP Testing Workflow (Required)
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Use these resources directly:
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- `resource://catalog/prompts/pytest-scaffold`
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- `resource://prompts/pytest-scaffold/document`
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- `resource://catalog/prompts/pytest-fill-scaffold`
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- `resource://prompts/pytest-fill-scaffold/document`
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## E1 — Scaffold tests first (structure only)
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Target modules:
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- `src/transcription/app.py`
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- `src/transcription/api/health.py`
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- `src/transcription/ui/upload_page.py`
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- `src/transcription/ui/jobs_page.py`
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Scaffold test files:
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- `tests/test_app.py`
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- `tests/api/test_health.py`
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- `tests/ui/test_pages_registration.py`
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- `tests/ui/test_upload_page.py`
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- `tests/ui/test_jobs_page.py`
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Scaffold constraints:
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- [ ] class/method skeletons only
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- [ ] one-line docstrings
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- [ ] concise behavior-focused names
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- [ ] no implementation assertions yet
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Validation:
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- [ ] `uv run pytest --collect-only -q`
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## E2 — Fill scaffold tests
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Fill constraints from MCP guidance:
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- [ ] preserve scaffold class/method names and docstrings (locked baseline)
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- [ ] one behavior target per method
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- [ ] deterministic tests preferred
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- [ ] minimal mocking; only nondeterministic boundaries
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Stack:
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- [ ] `fastapi` (or `mixed` if needed for UI+DB fixture combination)
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Suggested coverage:
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### `tests/api/test_health.py`
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- [ ] `/healthz` returns success status and expected payload shape
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### `tests/ui/test_pages_registration.py`
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- [ ] page registration wiring succeeds
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- [ ] expected routes are present
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### `tests/test_app.py`
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- [ ] startup path initializes runtime dependencies
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- [ ] worker start is invoked on startup
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- [ ] worker shutdown signal/cleanup is invoked on shutdown
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### `tests/ui/test_upload_page.py`
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- [ ] upload action calls upload service
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- [ ] success feedback displayed
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- [ ] error feedback displayed for `UploadError`
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- [ ] loading/progress state behavior covered
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### `tests/ui/test_jobs_page.py`
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- [ ] list renders job statuses
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- [ ] detail shows transcript text for successful job
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- [ ] detail shows error detail for failed job
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- [ ] refresh/loading state behavior covered
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Marker strategy:
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- [ ] `unit` for pure helpers/state formatting
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- [ ] `integration` for app/page/service+DB contracts
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- [ ] `external` not required for default Step 5 lane
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---
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## Validation Sequence (strict)
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- [ ] `uv run pytest --collect-only -q`
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- [ ] `uv run pytest -m unit -q` *(if unit tests touched)*
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- [ ] `uv run pytest tests/api/test_health.py -q`
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- [ ] `uv run pytest tests/ui/test_pages_registration.py -q`
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- [ ] `uv run pytest tests/test_app.py -q`
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- [ ] `uv run pytest tests/ui/test_upload_page.py -q`
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- [ ] `uv run pytest tests/ui/test_jobs_page.py -q`
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- [ ] `uv run pytest -q`
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---
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## Guardrails (NiceGUI + MVP)
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- [ ] Do not collapse pages into one file.
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- [ ] Do not use implicit global side effects for runtime wiring.
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- [ ] Keep UI responsive with explicit loading/progress/error states.
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- [ ] Do not place provider SDK calls in UI handlers.
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- [ ] Keep dependency direction one-way and maintainable.
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---
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## Definition of Done
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- [ ] App factory + lifespan are in place
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- [ ] Health endpoint exists and is tested
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- [ ] Upload page creates queued jobs through service boundary
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- [ ] Jobs list/detail pages render status/transcript/failure data
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- [ ] Worker lifecycle is started/stopped by app lifespan
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- [ ] Scaffold->fill testing flow completed and validated
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- [ ] Full suite passes: `uv run pytest -q`
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---
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## PR Checklist (Integrated)
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### Implementation
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- [ ] `app.py` app factory + lifespan implemented
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- [ ] FastAPI health route (`/healthz`) implemented
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- [ ] `ui/upload_page.py` implemented
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- [ ] `ui/jobs_page.py` implemented
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- [ ] `ui/__init__.py` explicit page registration implemented
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- [ ] Worker startup/shutdown managed by lifespan
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### Testing (MCP-compliant)
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- [ ] Scaffold phase completed first for all Step 5 tests
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- [ ] `--collect-only` passed on scaffolds
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- [ ] Fill phase completed without renaming/re-nesting scaffolded tests
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- [ ] Marker decisions documented (`unit` vs `integration`)
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- [ ] Targeted tests passed
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- [ ] Full suite passed
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### Evidence
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- [ ] Validation command outputs captured
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- [ ] Files created/updated listed
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- [ ] MCP prompt resources referenced in implementation notes
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- [ ] Any residual risks/questions documented
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---
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