feat(grid): ajout algorithme score produit avec parametrage dynamique et page d'aide

src/app/api/export/excel/route.ts

@@ -0,0 +1,108 @@
+import { NextRequest, NextResponse } from "next/server";
+import ExcelJS from "exceljs";
+import { z } from "zod";
+
+const ExportSchema = z.object({
+    nomFournisseur: z.string(),
+    rows: z.array(z.object({
+        codein: z.string(),
+        libelle1: z.string(),
+        code3: z.string(),
+        libelle3: z.string(),
+        codeGamme: z.string().nullable(),
+        totalQuantite: z.number(),
+        totalCa: z.number(),
+        tauxMarge: z.number(),
+        // Before gamme for delta
+        gammeAvant: z.string().nullable().optional(),
+    })),
+});
+
+export async function POST(req: NextRequest) {
+    const body = await req.json();
+    const parsed = ExportSchema.safeParse(body);
+    if (!parsed.success) {
+        return NextResponse.json({ error: "Invalid payload" }, { status: 400 });
+    }
+
+    const { nomFournisseur, rows } = parsed.data;
+    const workbook = new ExcelJS.Workbook();
+    workbook.creator = "CollectFlow";
+    workbook.created = new Date();
+
+    const sheet = workbook.addWorksheet("Assortiment", {
+        views: [{ state: "frozen", ySplit: 1 }],
+    });
+
+    // Header style
+    const headerStyle: Partial<ExcelJS.Style> = {
+        font: { bold: true, color: { argb: "FFFFFFFF" } },
+        fill: { type: "pattern", pattern: "solid", fgColor: { argb: "FF0F172A" } },
+        alignment: { horizontal: "center" },
+        border: { bottom: { style: "thin", color: { argb: "FF334155" } } },
+    };
+
+    sheet.columns = [
+        { header: "Code", key: "codein", width: 14 },
+        { header: "Désignation", key: "libelle1", width: 40 },
+        { header: "Nomenclature", key: "libelle3", width: 25 },
+        { header: "Gamme Avant", key: "gammeAvant", width: 14 },
+        { header: "Gamme Après", key: "codeGamme", width: 14 },
+        { header: "Delta", key: "delta", width: 10 },
+        { header: "Vol. 12m", key: "totalQuantite", width: 12 },
+        { header: "CA 12m (€)", key: "totalCa", width: 14 },
+        { header: "Marge (%)", key: "tauxMarge", width: 12 },
+    ];
+
+    // Apply header style
+    sheet.getRow(1).eachCell((cell) => { Object.assign(cell, headerStyle); });
+    sheet.getRow(1).height = 22;
+
+    // Gamme colours
+    const GAMME_COLORS: Record<string, string> = {
+        A: "FF064E3B", B: "FF1E3A5F", C: "FF78350F", Z: "FF4C0519",
+    };
+
+    for (const row of rows) {
+        const delta = row.gammeAvant !== row.codeGamme ? `${row.gammeAvant ?? "—"} → ${row.codeGamme ?? "—"}` : "";
+        const excelRow = sheet.addRow({
+            codein: row.codein,
+            libelle1: row.libelle1,
+            libelle3: row.libelle3,
+            gammeAvant: row.gammeAvant ?? "—",
+            codeGamme: row.codeGamme ?? "—",
+            delta,
+            totalQuantite: Math.round(row.totalQuantite),
+            totalCa: parseFloat(row.totalCa.toFixed(2)),
+            tauxMarge: parseFloat(row.tauxMarge.toFixed(2)),
+        });
+
+        // Colour the "Gamme Après" cell
+        const gammeCell = excelRow.getCell("codeGamme");
+        if (row.codeGamme && GAMME_COLORS[row.codeGamme]) {
+            gammeCell.fill = { type: "pattern", pattern: "solid", fgColor: { argb: GAMME_COLORS[row.codeGamme] } };
+            gammeCell.font = { bold: true, color: { argb: "FFFFFFFF" } };
+        }
+
+        // Highlight changed rows
+        if (delta) {
+            excelRow.getCell("delta").font = { bold: true, color: { argb: "FFFBBF24" } };
+        }
+
+        // Format numbers
+        excelRow.getCell("totalCa").numFmt = '#,##0.00 "€"';
+        excelRow.getCell("tauxMarge").numFmt = '0.00"%"';
+    }
+
+    // Generate buffer
+    const buffer = await workbook.xlsx.writeBuffer();
+
+    const filename = `Assortiment_${nomFournisseur.replace(/\s+/g, "_")}_${new Date().toISOString().slice(0, 10)}.xlsx`;
+
+    return new NextResponse(buffer, {
+        headers: {
+            "Content-Type": "application/vnd.openxmlformats-officedocument.spreadsheetml.sheet",
+            "Content-Disposition": `attachment; filename="${filename}"`,
+        },
+    });
+}