Checkpoint: Placement intelligent du cartouche BAP : détection de zone blanche par rasterisation PDF (pdftoppm + sharp), cartouche positionné automatiquement dans la zone blanche disponible, ou sur une nouvelle page annexe si aucune zone suffisante n'existe
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server/bapCartouche.ts
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server/bapCartouche.ts
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/**
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* bapCartouche.ts
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* Helper centralisé pour dessiner le cartouche BAP sur un PDF.
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* Utilise la détection de zone blanche pour positionner le cartouche
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* sans masquer d'informations importantes.
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*/
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import type { PDFDocument, PDFPage } from "pdf-lib";
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import { findBestWhiteZone } from "./pdfWhiteZone";
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export interface BapCartoucheData {
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typeAchat: string;
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destinataire: string;
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serviceConcerne: string;
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ventilationComptable: string;
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validatedAt: Date;
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signatureImageBytes?: Buffer;
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signatureMimeType?: "image/png" | "image/jpeg";
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signatureName?: string;
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}
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/**
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* Dessine le cartouche BAP sur le PDF.
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* Détecte automatiquement une zone blanche disponible.
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* Si aucune zone n'est trouvée, ajoute une nouvelle page annexe.
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*
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* @returns Le PDFDocument modifié (même référence)
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*/
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export async function drawBapCartouche(
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pdfDoc: PDFDocument,
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pdfBuffer: Buffer,
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data: BapCartoucheData
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): Promise<PDFDocument> {
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const { rgb, StandardFonts } = await import("pdf-lib");
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const pages = pdfDoc.getPages();
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const lastPageIndex = pages.length - 1;
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const lastPage = pages[lastPageIndex];
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const { width: pageWidth, height: pageHeight } = lastPage.getSize();
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const ZONE_HEIGHT = 160;
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const ZONE_MARGIN = 28;
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const ZONE_WIDTH = pageWidth - ZONE_MARGIN * 2;
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// ── Détection de la zone blanche ─────────────────────────────────────────
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let targetPage: PDFPage;
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let zoneX: number;
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let zoneY: number;
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let zoneW: number;
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let zoneH: number;
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let isNewPage = false;
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const whiteZone = await findBestWhiteZone(pdfBuffer, pageWidth, pageHeight, lastPageIndex);
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if (whiteZone && whiteZone.height >= 140) {
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// Zone blanche trouvée sur la dernière page
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targetPage = pages[whiteZone.pageIndex];
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zoneX = whiteZone.x;
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zoneY = whiteZone.y;
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zoneW = whiteZone.width;
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zoneH = Math.min(ZONE_HEIGHT, whiteZone.height);
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} else {
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// Aucune zone suffisante → ajouter une nouvelle page
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targetPage = pdfDoc.addPage([pageWidth, pageHeight]);
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zoneX = ZONE_MARGIN;
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zoneY = pageHeight - ZONE_HEIGHT - 40;
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zoneW = ZONE_WIDTH;
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zoneH = ZONE_HEIGHT;
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isNewPage = true;
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// Sur la nouvelle page, ajouter un en-tête discret
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const fontHeader = await pdfDoc.embedFont(StandardFonts.Helvetica);
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targetPage.drawText("Annexe BAP — Bon à Payer", {
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x: ZONE_MARGIN,
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y: pageHeight - 30,
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size: 10,
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font: fontHeader,
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color: rgb(0.5, 0.5, 0.5),
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});
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}
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// ── Dessin du cartouche ───────────────────────────────────────────────────
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const font = await pdfDoc.embedFont(StandardFonts.HelveticaBold);
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const fontNormal = await pdfDoc.embedFont(StandardFonts.Helvetica);
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const leftColW = Math.floor(zoneW * 0.62);
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const rightColX = zoneX + leftColW + 10;
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const rightColW = zoneW - leftColW - 20;
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// Fond blanc avec bordure
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targetPage.drawRectangle({
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x: zoneX,
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y: zoneY,
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width: zoneW,
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height: zoneH,
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color: rgb(1, 1, 1),
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borderColor: rgb(0.2, 0.2, 0.2),
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borderWidth: 1,
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});
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// Ligne 1 : CAPEX/OPEX
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targetPage.drawText(data.typeAchat.toUpperCase(), {
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x: zoneX + 10,
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y: zoneY + zoneH - 22,
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size: 11,
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font,
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color: rgb(0.1, 0.1, 0.5),
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});
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// Ligne 2 : BON À PAYER
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targetPage.drawText("BON À PAYER", {
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x: zoneX + 10,
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y: zoneY + zoneH - 42,
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size: 14,
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font,
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color: rgb(0, 0.5, 0),
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});
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// Ligne 3 : Destinataire
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targetPage.drawText(data.destinataire || "TOUS", {
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x: zoneX + 10,
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y: zoneY + zoneH - 62,
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size: 10,
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font: fontNormal,
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color: rgb(0.2, 0.2, 0.2),
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});
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// Séparateur horizontal
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targetPage.drawLine({
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start: { x: zoneX + 10, y: zoneY + zoneH - 72 },
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end: { x: zoneX + leftColW - 10, y: zoneY + zoneH - 72 },
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thickness: 0.5,
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color: rgb(0.7, 0.7, 0.7),
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});
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// Ligne 4 : Service + Ventilation
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targetPage.drawText(
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`Service : ${data.serviceConcerne || "-"} | Ventilation : ${data.ventilationComptable || "-"}`,
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{
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x: zoneX + 10,
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y: zoneY + zoneH - 88,
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size: 9,
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font: fontNormal,
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color: rgb(0.2, 0.2, 0.2),
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}
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);
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// Ligne 5 : Date de validation
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const dateStr = data.validatedAt.toLocaleDateString("fr-FR", {
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day: "2-digit",
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month: "2-digit",
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year: "numeric",
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});
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const timeStr = data.validatedAt.toLocaleTimeString("fr-FR", {
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hour: "2-digit",
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minute: "2-digit",
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});
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targetPage.drawText(`Validé le ${dateStr} à ${timeStr}`, {
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x: zoneX + 10,
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y: zoneY + zoneH - 104,
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size: 8,
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font: fontNormal,
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color: rgb(0.4, 0.4, 0.4),
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});
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// Note si nouvelle page
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if (isNewPage) {
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targetPage.drawText("(cartouche ajouté sur page annexe — facture complète sur page précédente)", {
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x: zoneX + 10,
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y: zoneY + zoneH - 120,
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size: 7,
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font: fontNormal,
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color: rgb(0.6, 0.6, 0.6),
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});
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}
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// Séparateur vertical
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targetPage.drawLine({
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start: { x: zoneX + leftColW, y: zoneY + 10 },
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end: { x: zoneX + leftColW, y: zoneY + zoneH - 10 },
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thickness: 0.5,
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color: rgb(0.8, 0.8, 0.8),
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});
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// ── Signature ─────────────────────────────────────────────────────────────
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if (data.signatureImageBytes && data.signatureName) {
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try {
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const mimeType = data.signatureMimeType || "image/png";
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const embeddedSig =
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mimeType === "image/png"
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? await pdfDoc.embedPng(data.signatureImageBytes)
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: await pdfDoc.embedJpg(data.signatureImageBytes);
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const sigWidth = Math.min(rightColW - 10, 110);
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const sigHeight = Math.round(sigWidth * 0.45);
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const sigX = rightColX + (rightColW - sigWidth) / 2;
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const sigY = zoneY + 35;
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targetPage.drawImage(embeddedSig, {
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x: sigX,
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y: sigY,
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width: sigWidth,
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height: sigHeight,
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});
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const nameW = fontNormal.widthOfTextAtSize(data.signatureName, 8);
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targetPage.drawText(data.signatureName, {
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x: sigX + (sigWidth - nameW) / 2,
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y: zoneY + 22,
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size: 8,
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font: fontNormal,
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color: rgb(0.3, 0.3, 0.3),
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});
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} catch (_) {
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/* ignore signature errors */
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}
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}
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return pdfDoc;
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}
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