Printer Adjustments

src/printer.js

@@ -41,9 +41,26 @@ export function isConfigured(site) {
   return Boolean(site?.printer_enabled && site?.printer_host);
 }
 
-/** brother_ql's label id. The two-colour roll is a different label to the plain one. */
+/**
+ * brother_ql's media id for the roll that is actually loaded.
+ *
+ * This is set explicitly rather than inferred from the red styling option. A
+ * two-colour job sent to a plain roll is rejected by the printer with "Wrong
+ * Roll Type", which gives no clue that a colour checkbox caused it.
+ */
+export const ROLL_TYPES = {
+  '62': '62 mm continuous, black only',
+  '62red': '62 mm continuous, black and red (DK-22251)',
+};
+
 export function labelFor(site) {
-  return site?.badge_accent ? '62red' : '62';
+  const label = site?.printer_label;
+  return Object.hasOwn(ROLL_TYPES, label) ? label : '62';
+}
+
+/** Red ink only exists on the two-colour roll; anywhere else it prints dark grey. */
+export function accentWillPrintRed(site) {
+  return Boolean(site?.badge_accent) && labelFor(site) === '62red';
 }
 
 /* ------------------------------------------------------------ rendering */
@@ -223,7 +240,8 @@ export async function renderBadgePng(visit, site) {
 
   const design = createCanvas(designW, designH);
   const ctx = design.getContext('2d');
-  const accent = Boolean(site.badge_accent);
+  // Only paint red when the loaded roll can actually print it.
+  const accent = accentWillPrintRed(site);
 
   // Measure first, then draw the block centred down the label. Without this the
   // content hugs the top and leaves a wide blank strip at the bottom of every badge.
@@ -273,6 +291,9 @@ function explainPrintError(output, host) {
   if (/Unknown label|label/i.test(last) && /identifier/i.test(last)) {
     return 'The printer rejected the label size. Check the roll loaded matches the badge settings.';
   }
+  if (/wrong roll|WrongMedia|media/i.test(last)) {
+    return 'The printer says the roll is wrong. Check "Roll loaded in the printer" matches what is actually in the machine — a black and red job is refused on a plain roll.';
+  }
   return last || 'The printer did not accept the job.';
 }