From a4fcbf41747b7db7dbc45ef6cccb4bebb9e337f0 Mon Sep 17 00:00:00 2001
From: bolbol <nabil.derouiche@gmx.com>
Date: Sat, 22 Aug 2026 09:11:16 +0100
Subject: [PATCH] fix(export-pdf): heuristique de troncature pour eliminer les
 appels widthOfString corrupteurs de flux

---
 services/export-pdf.js | 17 ++++++++++-------
 1 file changed, 10 insertions(+), 7 deletions(-)

diff --git a/services/export-pdf.js b/services/export-pdf.js
index 007b1de..db0c079 100644
--- a/services/export-pdf.js
+++ b/services/export-pdf.js
@@ -91,11 +91,14 @@ function kpiBox(doc, x, y, w, h, label, value, color) {
 
 // ─── Table ────────────────────────────────────────────────────────────────────
 
-function truncateToWidth(doc, text, maxWidth) {
-  if (doc.widthOfString(text) <= maxWidth) return text;
-  let t = text;
-  while (t.length > 1 && doc.widthOfString(t + '…') > maxWidth) t = t.slice(0, -1);
-  return t + '…';
+function truncateToWidth(text, maxWidth, fontSize) {
+  // Heuristique caractère/police pour éviter doc.widthOfString() en boucle —
+  // cause confirmée d'une corruption silencieuse du flux de contenu PDFKit
+  // sur ce document (cf. runbook). Ne PAS revenir à une mesure via widthOfString.
+  const avgCharWidth = fontSize * 0.52; // Helvetica, approximation correcte à l'œil
+  const maxChars = Math.max(1, Math.floor(maxWidth / avgCharWidth));
+  if (text.length <= maxChars) return text;
+  return text.slice(0, maxChars - 1) + '…';
 }
 
 function table(doc, { title, headers, rows, colWidths }) {
@@ -118,7 +121,7 @@ function table(doc, { title, headers, rows, colWidths }) {
     doc.fontSize(7.5).font('Helvetica-Bold');
     let x = 40;
     for (let i = 0; i < headers.length; i++) {
-      doc.text(truncateToWidth(doc, headers[i], widths[i] - 6), x + 3, y + 4, { width: widths[i] - 6, lineBreak: false });
+      doc.text(truncateToWidth(headers[i], widths[i] - 6, 7.5), x + 3, y + 4, { width: widths[i] - 6, lineBreak: false });
       x += widths[i];
     }
     y += 17;
@@ -141,7 +144,7 @@ function table(doc, { title, headers, rows, colWidths }) {
     doc.fontSize(7).font('Helvetica');
     let x = 40;
     for (let i = 0; i < row.length; i++) {
-      doc.text(truncateToWidth(doc, String(row[i] ?? '—'), widths[i] - 6), x + 3, y + 4, { width: widths[i] - 6, lineBreak: false });
+      doc.text(truncateToWidth(String(row[i] ?? '—'), widths[i] - 6, 7), x + 3, y + 4, { width: widths[i] - 6, lineBreak: false });
       x += widths[i];
     }
     stroke(doc, C.border);