From e7e359cbf7b2b2104f71c930377005f07b1d3abd Mon Sep 17 00:00:00 2001
From: Toan Hoang Minh <minhtoandut96@gmail.com>
Date: Fri, 31 Jul 2026 16:04:22 +0700
Subject: [PATCH] feat: add AssetItem validation + CRUD (src/lib/assets.ts)

---
 src/lib/assets.ts | 133 ++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 133 insertions(+)
 create mode 100644 src/lib/assets.ts

diff --git a/src/lib/assets.ts b/src/lib/assets.ts
new file mode 100644
index 0000000..684bb38
--- /dev/null
+++ b/src/lib/assets.ts
@@ -0,0 +1,133 @@
+import { z } from "zod";
+import { Prisma } from "@prisma/client";
+import { prisma } from "./prisma";
+
+export type AssetItemStatus = "in_stock" | "assigned" | "repair" | "retired";
+
+export interface AssetItemRecord {
+  id: string;
+  serial_number: string;
+  model: string;
+  purchase_date: string;
+  warranty_end_date: string | null;
+  status: AssetItemStatus;
+  created_at: string;
+}
+
+export interface CreateAssetItemInput {
+  serialNumber: string;
+  model: string;
+  purchaseDate: Date;
+  warrantyEndDate?: Date;
+}
+
+export type ValidationResult =
+  | { ok: true; value: CreateAssetItemInput }
+  | { ok: false; error: string };
+
+// Mirrors src/lib/employees.ts's nonEmptyString helper.
+function nonEmptyString(message: string) {
+  return z.string({ required_error: message, invalid_type_error: message }).refine(
+    (value) => value.trim() !== "",
+    { message }
+  );
+}
+
+// Accepts any string Date.parse() can handle (e.g. "2026-07-31") and
+// transforms it into a Date for Prisma — validation and normalization in
+// one step, same spirit as the uuid() checks elsewhere in this codebase.
+function dateString(message: string) {
+  return z
+    .string({ required_error: message, invalid_type_error: message })
+    .refine((value) => !Number.isNaN(Date.parse(value)), { message })
+    .transform((value) => new Date(value));
+}
+
+const createAssetItemSchema = z.object({
+  serialNumber: nonEmptyString("serialNumber is required and must be a non-empty string"),
+  model: nonEmptyString("model is required and must be a non-empty string"),
+  purchaseDate: dateString("purchaseDate is required and must be a valid date string"),
+  warrantyEndDate: dateString("warrantyEndDate must be a valid date string").optional(),
+});
+
+/**
+ * Validates raw (untyped) asset-item-creation input. serialNumber/model
+ * must be non-empty strings, purchaseDate must be a valid date string,
+ * warrantyEndDate is optional but must be a valid date string if present.
+ * status is not accepted here — new assets always start "in_stock" (same
+ * pattern as Request always starting "Draft"), later states are set via
+ * other operations, not at creation.
+ */
+export function validateCreateAssetItemInput(input: {
+  serialNumber?: unknown;
+  model?: unknown;
+  purchaseDate?: unknown;
+  warrantyEndDate?: unknown;
+}): ValidationResult {
+  const result = createAssetItemSchema.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;
+  serialNumber: string;
+  model: string;
+  purchaseDate: Date;
+  warrantyEndDate: Date | null;
+  status: AssetItemStatus;
+  createdAt: Date;
+}): AssetItemRecord {
+  return {
+    id: row.id,
+    serial_number: row.serialNumber,
+    model: row.model,
+    purchase_date: row.purchaseDate.toISOString(),
+    warranty_end_date: row.warrantyEndDate ? row.warrantyEndDate.toISOString() : null,
+    status: row.status,
+    created_at: row.createdAt.toISOString(),
+  };
+}
+
+export type CreateAssetItemResult =
+  | { ok: true; value: AssetItemRecord }
+  | { ok: false; error: string };
+
+/**
+ * Creates an AssetItem. If serialNumber collides with an existing row,
+ * Prisma raises a known error (code P2002, unique constraint violation) —
+ * caught here and translated into the same `{ok:false,error}` shape as
+ * input validation failures, rather than letting a raw Prisma error leak
+ * to the API layer. Mirrors createEmployee()/createRequest()'s P2003
+ * handling for FK violations.
+ */
+export async function createAssetItem(
+  input: CreateAssetItemInput
+): Promise<CreateAssetItemResult> {
+  try {
+    const created = await prisma.assetItem.create({
+      data: {
+        serialNumber: input.serialNumber,
+        model: input.model,
+        purchaseDate: input.purchaseDate,
+        warrantyEndDate: input.warrantyEndDate ?? null,
+      },
+    });
+    return { ok: true, value: toRecord(created) };
+  } catch (error) {
+    if (error instanceof Prisma.PrismaClientKnownRequestError && error.code === "P2002") {
+      return { ok: false, error: "serialNumber already exists" };
+    }
+    throw error;
+  }
+}
+
+export async function listAssetItems(): Promise<AssetItemRecord[]> {
+  const rows = await prisma.assetItem.findMany({
+    orderBy: [{ createdAt: "desc" }, { id: "desc" }],
+  });
+  return rows.map(toRecord);
+}