Phase 04 Plan 04: Intake Auto-Print Integration Summary

Auto-print after NetBox record creation wired into intake handler using an optional IntakePrinter interface; printer failures are non-fatal and surfaced as print_skipped: true in the 201 response.

What Was Built

The intake handler now automatically prints a label as the final step of a successful intake flow. After UpdateCatalogStatus completes, the handler calls labels.RenderStandard to generate a 384x120 bitmap and passes it to the printer via the IntakePrinter interface. Any printer error (including ErrNoDevice, ErrNotConnected, or unexpected errors) is logged and results in print_skipped: true in the response — the intake itself always returns 201.

Tasks Completed

Task	Name	Commit	Files
1	Add IntakePrinter interface + auto-print to intake handler	`f9b1b3f`	intake.go, intake_test.go, main.go

Decisions Made

AINotes as SpecLine fallback — ai.IntakeResult has no SpecLine field. result.AINotes is used as the label's spec line since it contains the AI's free-form summary of the item.
Variable name fix (bmpW/bmpH) — printer.ImageToRawBitmap returns ([]byte, int, int). Using w, h as variable names shadowed the http.ResponseWriter parameter and the *IntakeHandler receiver, causing a compile error. Renamed to bmpW/bmpH.
main.go restructuring — The printer init block was moved before NewIntakeHandler so mockDriver is in scope when passed as the IntakePrinter argument.
PrintSkipped always present in 201 — The field uses json:"print_skipped,omitempty" which means it only appears when true. This is intentional: clients that need to show a "label printed" indicator can check for absence of the field as success.

Deviations from Plan

Auto-fixed Issues

1. [Rule 1 - Bug] Variable shadowing in auto-print block

Found during: Task 1 (GREEN phase — compile error)
Issue: bitmap, w, h := printer.ImageToRawBitmap(img) shadowed w http.ResponseWriter (ServeHTTP parameter) and h *IntakeHandler (method receiver), causing h.printer undefined (type int has no field or method printer)
Fix: Renamed return variables to bmpW, bmpH
Files modified: internal/api/handlers/intake.go
Commit: f9b1b3f (included in task commit)

Test Coverage

Test	Scenario	Result
TestIntakePrinterSuccess	Mock printer returns nil	print_skipped=false, 201
TestIntakePrinterErrNoDevice	Mock printer returns error	print_skipped=true, 201
TestIntakeNilPrinter	Printer is nil	print_skipped=true, 201, no panic
TestIntakePrinterErrorNotFatal	Any printer error	201 (not 500), device_id present
TestIntakeHandlerRejectsZeroPhotos	Existing	PASS
TestIntakeHandlerRejectsFourPhotos	Existing	PASS
TestIntakeHandlerHighConfidence	Existing	PASS
TestIntakeHandlerLowConfidence	Existing	PASS
TestIntakeHandlerQuickAdd	Existing	PASS
TestIntakeHandlerNetBoxDown	Existing	PASS

All 10 tests pass. go build ./... clean.

Known Stubs

None — labels.RenderStandard and printer.ImageToRawBitmap are fully implemented. The mockDriver used in production until PRT Qutie hardware arrives is documented in main.go with a TODO.

Threat Flags

No new trust boundaries introduced. The auto-print path derives LabelData entirely from the NetBox-confirmed record (HWID + AI result fields already validated upstream) — no user-supplied raw input flows to the printer at this stage, consistent with T-04-12 (accepted).

Self-Check: PASSED

FOUND: internal/api/handlers/intake.go
FOUND: internal/api/handlers/intake_test.go
FOUND: cmd/hwlab/main.go
FOUND: commit f9b1b3f

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