---
phase: 03-printer-configuration
plan: 02
subsystem: ui
tags: [fastapi, jinja2, htmx, peewee, sqlite]

# Dependency graph
requires:
  - phase: 03-01
    provides: Printer and Client CRUD endpoints, DB models, printer_list partial template

provides:
  - GET /printers/{id} detail route with LEFT OUTER JOINs on Client and Driver
  - printer_detail.html full-page template showing all config fields and driver info
  - Disabled "Regenerate Package" button (Phase 4 placeholder)
  - Clickable printer name links in printer_list.html navigating to detail page

affects:
  - 04-script-generation (regenerate button placeholder ready to wire up)

# Tech tracking
tech-stack:
  added: []
  patterns:
    - "TDD RED/GREEN cycle: failing tests committed first, then implementation"
    - "LEFT OUTER JOIN chain with .switch(Printer) for multi-FK queries in Peewee"
    - "Null-safe driver_desc parse: check printer.driver_id before json.loads"

key-files:
  created:
    - imptune/templates/printer_detail.html
  modified:
    - imptune/api/pages.py
    - imptune/templates/partials/printer_list.html
    - tests/test_printer_crud.py

key-decisions:
  - "Detail page is a full-page template (not partial) — simpler than partial injection into printers.html"
  - "Route lives in pages.py (not printers.py) because it returns a full HTML page, not an HTMX fragment"

patterns-established:
  - "Full-page detail routes in pages.py; HTMX fragment routes in api/printers.py"
  - "Disabled placeholder buttons for Phase N+1 features with descriptive title attribute"

requirements-completed:
  - PRNT-10

# Metrics
duration: 2min
completed: 2026-04-10
---

# Phase 3 Plan 02: Printer Detail Page Summary

**GET /printers/{id} detail page with pre-populated config fields, associated driver info via FK, and disabled Regenerate Package button placeholder for Phase 4**

## Performance

- **Duration:** ~2 min
- **Started:** 2026-04-10T12:03:29Z
- **Completed:** 2026-04-10T12:05:56Z
- **Tasks:** 2
- **Files modified:** 4

## Accomplishments

- Printer detail route with Peewee multi-FK LEFT OUTER JOIN queries returning 200 or 404
- Full-page Jinja2 template showing all 8 config fields, driver package name, driver names list, and architecture
- Graceful "No driver assigned" display when driver FK is null
- Printer names in list view are now clickable navigation links to their detail pages
- 3 new integration tests; full suite at 61 passing

## Task Commits

1. **Task 1: Write failing tests for printer detail page** - `6e7892e` (test)
2. **Task 2: Implement printer detail route, template, and list nav links** - `cad664c` (feat)

**Plan metadata:** (committed next)

## Files Created/Modified

- `imptune/api/pages.py` - Added GET /printers/{printer_id} route with LEFT OUTER JOIN on Client and Driver
- `imptune/templates/printer_detail.html` - Full-page detail template with config, driver info, and regenerate placeholder
- `imptune/templates/partials/printer_list.html` - Printer name column wrapped in anchor tag linking to detail page
- `tests/test_printer_crud.py` - Added 3 tests: detail with driver, 404 not found, detail without driver

## Decisions Made

- Detail page uses a full-page template (not a partial) to avoid coupling it to the printers list layout
- Route placed in `pages.py` since it returns a full HTML page, keeping HTMX fragment routes in `api/printers.py`

## Deviations from Plan

None - plan executed exactly as written.

## Issues Encountered

None.

## User Setup Required

None - no external service configuration required.

## Next Phase Readiness

- PRNT-10 satisfied: saved configs are retrievable with driver association intact
- "Regenerate Package" button is present and disabled, ready for Phase 4 to wire up
- No blockers for Phase 4 script generation work

---
*Phase: 03-printer-configuration*
*Completed: 2026-04-10*
