feat(students): add CSV import endpoint for student data

routes/(apps)/students/api/students/import-csv.ts

@@ -0,0 +1,64 @@
+import { FreshContext, Handlers } from "$fresh/server.ts";
+import { db } from "$root/databases/db.ts";
+import { students } from "$root/databases/schema.ts";
+import { AuthenticatedState } from "$root/defaults/interfaces.ts";
+
+// #9 POST /students/import-csv
+export const handler: Handlers<null, AuthenticatedState> = {
+  async POST(
+    request: Request,
+    context: FreshContext<AuthenticatedState>,
+  ): Promise<Response> {
+    if (context.state.session.eduPersonPrimaryAffiliation !== "employee") {
+      return new Response(null, { status: 403 });
+    }
+
+    const formData = await request.formData();
+    const file = formData.get("file") as File | null;
+    const idPromo = formData.get("idPromo") as string | null;
+
+    if (!file || !idPromo) {
+      return new Response(null, { status: 400 });
+    }
+
+    const text = await file.text();
+    const lines = text.trim().split("\n");
+
+    let imported = 0;
+    const errors: { line: number; message: string }[] = [];
+
+    for (let i = 0; i < lines.length; i++) {
+      const lineNum = i + 1;
+      const cols = lines[i].split(",").map((c) => c.trim());
+
+      const [numEtudStr, nom, prenom] = cols;
+
+      if (!numEtudStr) {
+        errors.push({ line: lineNum, message: "Numéro étudiant manquant" });
+        continue;
+      }
+
+      const numEtud = Number(numEtudStr);
+      if (isNaN(numEtud)) {
+        errors.push({ line: lineNum, message: "Numéro étudiant invalide" });
+        continue;
+      }
+
+      if (!nom || !prenom) {
+        errors.push({ line: lineNum, message: "Nom ou prénom manquant" });
+        continue;
+      }
+
+      await db
+        .insert(students)
+        .values({ nom, prenom, idPromo })
+        .onConflictDoNothing();
+
+      imported++;
+    }
+
+    return new Response(JSON.stringify({ imported, errors }), {
+      headers: { "content-type": "application/json" },
+    });
+  },
+};