From 4ee72fe36dd513bcbad227f7bdd6ed0079d2c95a Mon Sep 17 00:00:00 2001
From: Sam Anthony <sam@samanthony.xyz>
Date: Thu, 7 May 2026 09:39:30 -0400
Subject: implement GET /validate-interior

---
 pkgid.go | 109 +++++++++++++++++++++++++++++++++++++++------------------------
 1 file changed, 68 insertions(+), 41 deletions(-)

(limited to 'pkgid.go')

diff --git a/pkgid.go b/pkgid.go
index 95b6303..1268568 100644
--- a/pkgid.go
+++ b/pkgid.go
@@ -1,10 +1,13 @@
 package lulu
 
 import (
-	"encoding/json"
+	"bytes"
+	"encoding"
 	"fmt"
 )
 
+//go:generate go run github.com/yawnak/string-enumer -t TrimSize -t ColorType -t Quality -t Binding -t Paper -t Finish -t Linen -t Foil --text -o ./pkgid_gen.go .
+
 // PkgId is a pod_package_id which represents the manufacturing options
 // of a printable.
 type PkgId struct {
@@ -18,8 +21,32 @@ type PkgId struct {
 	Foil
 }
 
-func (p PkgId) MarshalJSON() ([]byte, error) {
-	return json.Marshal(fmt.Sprintf("%s.%s.%s.%s.%s.%s%s%s", p.TrimSize, p.ColorType, p.Quality, p.Binding, p.Paper, p.Finish, p.Linen, p.Foil))
+func (p PkgId) MarshalText() ([]byte, error) {
+	return []byte(fmt.Sprintf("%s.%s.%s.%s.%s.%s%s%s", p.TrimSize, p.ColorType, p.Quality, p.Binding, p.Paper, p.Finish, p.Linen, p.Foil)), nil
+}
+
+func (p *PkgId) UnmarshalText(text []byte) error {
+	s := string(text)
+	parts := bytes.Split(text, []byte("."))
+	if len(parts) != 6 {
+		return fmt.Errorf("malformed pod_package_id %q: has %d dot-separated fields; want 6", s, len(parts))
+	}
+	cover := parts[5]
+	if len(cover) != 3 {
+		return fmt.Errorf("malformed pod_package_id %q: finish/linen/foil suffix must be 3 characters", s)
+	}
+
+	for i, field := range []encoding.TextUnmarshaler{&p.TrimSize, &p.ColorType, &p.Quality, &p.Binding, &p.Paper} {
+		if err := field.UnmarshalText(parts[i]); err != nil {
+			return err
+		}
+	}
+	for i, field := range []encoding.TextUnmarshaler{&p.Finish, &p.Linen, &p.Foil} {
+		if err := field.UnmarshalText([]byte{cover[i]}); err != nil {
+			return err
+		}
+	}
+	return nil
 }
 
 // TrimSize is the final dimensions of the pages after the bleed margins
@@ -28,21 +55,21 @@ type TrimSize string
 
 const (
 	Pocketbook        TrimSize = "0425X0687"
-	Novella                    = "0500X0800"
-	Digest                     = "0550X0850"
-	A5                         = "0583X0827"
-	UsTrade                    = "0600X0900"
-	Royal                      = "0614X0921"
-	Comic                      = "0663X1025"
-	SmallSquare                = "0750X0750"
-	Executive                  = "0700X1000"
-	CrownQuatro                = "0744X0968"
-	Square                     = "0850X0850"
-	A4                         = "0827X1169"
-	UsLetter                   = "0850X1100"
-	Landscape                  = "0900X0700"
-	UsLetterLandscape          = "1100X0850"
-	A4Landscape                = "1169X0827"
+	Novella           TrimSize = "0500X0800"
+	Digest            TrimSize = "0550X0850"
+	A5                TrimSize = "0583X0827"
+	UsTrade           TrimSize = "0600X0900"
+	Royal             TrimSize = "0614X0921"
+	Comic             TrimSize = "0663X1025"
+	SmallSquare       TrimSize = "0750X0750"
+	Executive         TrimSize = "0700X1000"
+	CrownQuatro       TrimSize = "0744X0968"
+	Square            TrimSize = "0850X0850"
+	A4                TrimSize = "0827X1169"
+	UsLetter          TrimSize = "0850X1100"
+	Landscape         TrimSize = "0900X0700"
+	UsLetterLandscape TrimSize = "1100X0850"
+	A4Landscape       TrimSize = "1169X0827"
 )
 
 // ColorType is the color mode of the printer.
@@ -50,7 +77,7 @@ type ColorType string
 
 const (
 	Mono  ColorType = "BW"
-	Color           = "FC"
+	Color ColorType = "FC"
 )
 
 // Quality is the print quality.
@@ -58,18 +85,18 @@ type Quality string
 
 const (
 	Premium  Quality = "PRE"
-	Standard         = "STD"
+	Standard Quality = "STD"
 )
 
 type Binding string
 
 const (
 	Perfect      Binding = "PB"
-	Coil                 = "CO"
-	SaddleStitch         = "SS"
-	CaseWrap             = "CW"
-	LinenWrap            = "LW"
-	WireO                = "WO"
+	Coil         Binding = "CO"
+	SaddleStitch Binding = "SS"
+	CaseWrap     Binding = "CW"
+	LinenWrap    Binding = "LW"
+	WireO        Binding = "WO"
 )
 
 // Paper is the weight/thickness and hue of the paper.
@@ -77,10 +104,10 @@ type Paper string
 
 const (
 	P60UncoatedWhite Paper = "060UW444"
-	P60UncoatedCream       = "060UC444"
-	P70CoatedWhite         = "070CW460"
-	P80CoatedWhite         = "080CW444"
-	P100CoatedWhite        = "100CW"
+	P60UncoatedCream Paper = "060UC444"
+	P70CoatedWhite   Paper = "070CW460"
+	P80CoatedWhite   Paper = "080CW444"
+	P100CoatedWhite  Paper = "100CW"
 )
 
 // Finish is the surface finish of the cover.
@@ -88,8 +115,8 @@ type Finish string
 
 const (
 	Gloss       Finish = "G"
-	Matte              = "M"
-	Unlaminated        = "U"
+	Matte       Finish = "M"
+	Unlaminated Finish = "U"
 )
 
 // Linen is the color of the linen-wrapped cover, if applicable.
@@ -97,13 +124,13 @@ type Linen string
 
 const (
 	RedLinen           Linen = "R"
-	NavyLinen                = "N"
-	BlackLinen               = "B"
-	GrayLinen                = "G"
-	TanLinen                 = "T"
-	ForestLinen              = "F"
-	InteriorCoverPrint       = "I"
-	NoLinen                  = "X"
+	NavyLinen          Linen = "N"
+	BlackLinen         Linen = "B"
+	GrayLinen          Linen = "G"
+	TanLinen           Linen = "T"
+	ForestLinen        Linen = "F"
+	InteriorCoverPrint Linen = "I"
+	NoLinen            Linen = "X"
 )
 
 // Foil is the color of the foil stamping, if applicable.
@@ -111,7 +138,7 @@ type Foil string
 
 const (
 	GoldFoil  Foil = "G"
-	BlackFoil      = "B"
-	WhiteFoil      = "W"
-	NoFoil         = "X"
+	BlackFoil Foil = "B"
+	WhiteFoil Foil = "W"
+	NoFoil    Foil = "X"
 )
-- 
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