feat: add Area validation + CRUD (src/lib/areas.ts)

Co-Authored-By: Claude Sonnet 5 <[email protected]>

src/lib/areas.ts

@@ -0,0 +1,92 @@
+// Area — physical location tag for the office-move inventory walk (see
+// prisma/schema.prisma's Area model comment). Same shape/conventions as
+// src/lib/employees.ts: validate -> create (P2002 on duplicate name) ->
+// list.
+import { z } from "zod";
+import { Prisma } from "@prisma/client";
+import { prisma } from "./prisma";
+
+export interface AreaRecord {
+  id: string;
+  name: string;
+  team: string | null;
+  created_at: string;
+}
+
+export interface CreateAreaInput {
+  name: string;
+  team?: string;
+}
+
+export type ValidationResult =
+  | { ok: true; value: CreateAreaInput }
+  | { ok: false; error: string };
+
+function nonEmptyString(message: string) {
+  return z.string({ required_error: message, invalid_type_error: message }).refine(
+    (value) => value.trim() !== "",
+    { message }
+  );
+}
+
+const createAreaSchema = z.object({
+  name: nonEmptyString("name is required and must be a non-empty string"),
+  team: z.string({ invalid_type_error: "team must be a string" }).optional(),
+});
+
+export function validateCreateAreaInput(input: {
+  name?: unknown;
+  team?: unknown;
+}): ValidationResult {
+  const result = createAreaSchema.safeParse(input);
+  if (!result.success) {
+    const message = result.error.issues[0]?.message ?? "Invalid input";
+    return { ok: false, error: message };
+  }
+  return { ok: true, value: result.data };
+}
+
+function toRecord(row: {
+  id: string;
+  name: string;
+  team: string | null;
+  createdAt: Date;
+}): AreaRecord {
+  return {
+    id: row.id,
+    name: row.name,
+    team: row.team,
+    created_at: row.createdAt.toISOString(),
+  };
+}
+
+export type CreateAreaResult = { ok: true; value: AreaRecord } | { ok: false; error: string };
+
+/**
+ * Creates an Area, or returns the existing one if `name` already exists
+ * (idempotent-by-name) — this is deliberate, not just P2002 error handling:
+ * the bot's "reuse existing or type a new one" flow calls this every time a
+ * user picks/types an Area name, and re-submitting an Area the bot already
+ * showed as an existing option must succeed, not 409.
+ */
+export async function createOrGetArea(input: CreateAreaInput): Promise<CreateAreaResult> {
+  try {
+    const created = await prisma.area.create({
+      data: { name: input.name, team: input.team ?? null },
+    });
+    return { ok: true, value: toRecord(created) };
+  } catch (error) {
+    if (error instanceof Prisma.PrismaClientKnownRequestError && error.code === "P2002") {
+      const existing = await prisma.area.findUnique({ where: { name: input.name } });
+      if (existing) {
+        return { ok: true, value: toRecord(existing) };
+      }
+    }
+    throw error;
+  }
+}
+
+export async function listAreas(): Promise<AreaRecord[]> {
+  const rows = await prisma.area.findMany({ orderBy: [{ name: "asc" }] });
+  return rows.map(toRecord);
+}