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import { defineStore } from "pinia";
import {
secureRandomUUID,
type BusinessId,
type GuestBagMergeItem,
} from "@plain-journal/foundation";
export interface GuestBagItem {
productId: BusinessId;
skuId: BusinessId;
productTitle: string;
skuName: string;
unitPrice: string;
quantity: number;
coverUrl: string | null;
}
const STORAGE_KEY = "plain-journal:guest-bag:v1";
const PENDING_MERGE_KEY = "plain-journal:guest-bag-merge:v1";
const MAX_GUEST_QUANTITY = 999;
const MAX_GUEST_ITEMS = 100;
const BUSINESS_ID_PATTERN = /^\d+$/u;
const MERGE_KEY_PATTERN = /^[A-Za-z0-9._:-]{8,64}$/u;
export interface PendingGuestBagMerge {
key: string;
userId: BusinessId;
items: GuestBagMergeItem[];
}
export class GuestBagMergeOwnershipError extends Error {
constructor() {
super("这个设备上有一笔属于另一账户且结果尚未确认的购物袋合并。");
this.name = "GuestBagMergeOwnershipError";
}
}
function isRecord(value: unknown): value is Record<string, unknown> {
return Boolean(value && typeof value === "object");
}
function normalizeQuantity(value: unknown, fallback: number | null = null): number | null {
if (typeof value !== "number" || !Number.isFinite(value)) {
return fallback;
}
return Math.max(1, Math.min(MAX_GUEST_QUANTITY, Math.trunc(value)));
}
function normalizeItem(value: unknown): GuestBagItem | null {
Iif (!isRecord(value)) {
return null;
}
const quantity = normalizeQuantity(value.quantity);
const numericPrice = Number(value.unitPrice);
if (
typeof value.productId !== "string"
|| !BUSINESS_ID_PATTERN.test(value.productId)
|| typeof value.skuId !== "string"
|| !BUSINESS_ID_PATTERN.test(value.skuId)
|| typeof value.productTitle !== "string"
|| value.productTitle.trim().length === 0
|| typeof value.skuName !== "string"
|| value.skuName.trim().length === 0
|| typeof value.unitPrice !== "string"
|| !Number.isFinite(numericPrice)
|| numericPrice < 0
|| quantity === null
|| !(value.coverUrl === null || typeof value.coverUrl === "string")
) {
return null;
}
return {
productId: value.productId,
skuId: value.skuId,
productTitle: value.productTitle,
skuName: value.skuName,
unitPrice: value.unitPrice,
quantity,
coverUrl: value.coverUrl,
};
}
function normalizeMergeItem(value: unknown): GuestBagMergeItem | null {
Iif (!isRecord(value)) {
return null;
}
const quantity = normalizeQuantity(value.quantity);
Eif (
typeof value.productId !== "string"
|| !BUSINESS_ID_PATTERN.test(value.productId)
|| typeof value.skuId !== "string"
|| !BUSINESS_ID_PATTERN.test(value.skuId)
|| quantity === null
) {
return null;
}
return {
productId: value.productId,
skuId: value.skuId,
quantity,
};
}
function loadItems(): GuestBagItem[] {
Iif (typeof localStorage === "undefined") {
return [];
}
try {
const value: unknown = JSON.parse(localStorage.getItem(STORAGE_KEY) ?? "[]");
Iif (!Array.isArray(value)) {
localStorage.removeItem(STORAGE_KEY);
return [];
}
const normalized: GuestBagItem[] = [];
for (const candidate of value) {
const item = normalizeItem(candidate);
if (!item) {
continue;
}
const existing = normalized.find((current) => current.skuId === item.skuId);
if (existing) {
Eif (existing.productId === item.productId) {
existing.quantity = Math.min(
MAX_GUEST_QUANTITY,
existing.quantity + item.quantity,
);
}
} else Eif (normalized.length < MAX_GUEST_ITEMS) {
normalized.push(item);
}
}
localStorage.setItem(STORAGE_KEY, JSON.stringify(normalized));
return normalized;
} catch {
localStorage.removeItem(STORAGE_KEY);
return [];
}
}
function loadPendingMerge(): PendingGuestBagMerge | null {
Iif (typeof localStorage === "undefined") {
return null;
}
try {
const value: unknown = JSON.parse(localStorage.getItem(PENDING_MERGE_KEY) ?? "null");
if (
!value
|| typeof value !== "object"
|| !("key" in value)
|| !("userId" in value)
|| !("items" in value)
|| typeof value.key !== "string"
|| typeof value.userId !== "string"
|| !Array.isArray(value.items)
) {
localStorage.removeItem(PENDING_MERGE_KEY);
return null;
}
Iif (
!MERGE_KEY_PATTERN.test(value.key)
|| !BUSINESS_ID_PATTERN.test(value.userId)
|| value.items.length === 0
|| value.items.length > MAX_GUEST_ITEMS
) {
localStorage.removeItem(PENDING_MERGE_KEY);
return null;
}
const items = value.items.map(normalizeMergeItem);
const validItems = items.filter((item): item is GuestBagMergeItem => item !== null);
const uniqueSkuIds = new Set(validItems.map((item) => item.skuId));
Eif (validItems.length !== value.items.length || uniqueSkuIds.size !== validItems.length) {
localStorage.removeItem(PENDING_MERGE_KEY);
return null;
}
return {
key: value.key,
userId: value.userId,
items: validItems,
};
} catch {
localStorage.removeItem(PENDING_MERGE_KEY);
return null;
}
}
function newMergeKey(): string {
return `guest-merge:${secureRandomUUID()}`;
}
export const useBagStore = defineStore("guest-bag", () => {
const items = ref<GuestBagItem[]>(loadItems());
const pendingMerge = ref<PendingGuestBagMerge | null>(loadPendingMerge());
const itemCount = computed(() => items.value.reduce(
(total, item) => total + item.quantity,
0,
));
const subtotal = computed(() => items.value.reduce(
(total, item) => total + Number(item.unitPrice) * item.quantity,
0,
));
function persist() {
Eif (typeof localStorage !== "undefined") {
localStorage.setItem(STORAGE_KEY, JSON.stringify(items.value));
}
}
function addItem(item: GuestBagItem) {
const normalized = normalizeItem(item);
Iif (!normalized) {
throw new Error("商品信息不完整，无法写入当前设备购物袋。");
}
const existing = items.value.find((candidate) =>
candidate.skuId === normalized.skuId);
if (existing) {
Iif (existing.productId !== normalized.productId) {
throw new Error("同一 SKU 对应了不同商品，当前设备购物袋未修改。");
}
existing.quantity = Math.min(
MAX_GUEST_QUANTITY,
existing.quantity + normalized.quantity,
);
} else {
Iif (items.value.length >= MAX_GUEST_ITEMS) {
throw new Error("当前设备购物袋最多保留 100 种商品。");
}
items.value.push(normalized);
}
persist();
}
function updateQuantity(skuId: BusinessId, quantity: number) {
const item = items.value.find((candidate) => candidate.skuId === skuId);
Iif (!item) {
return;
}
item.quantity = normalizeQuantity(quantity, item.quantity) ?? item.quantity;
persist();
}
function removeItem(skuId: BusinessId): GuestBagItem | null {
const index = items.value.findIndex((candidate) => candidate.skuId === skuId);
Iif (index < 0) {
return null;
}
const [removed] = items.value.splice(index, 1);
persist();
return removed ?? null;
}
function restoreItem(item: GuestBagItem) {
const normalized = normalizeItem(item);
Iif (!normalized) {
return;
}
const existing = items.value.some((candidate) =>
candidate.skuId === normalized.skuId);
Eif (!existing) {
Iif (items.value.length >= MAX_GUEST_ITEMS) {
return;
}
items.value.push(normalized);
persist();
}
}
function prepareMerge(userId: BusinessId): PendingGuestBagMerge | null {
if (pendingMerge.value) {
if (pendingMerge.value.userId !== userId) {
throw new GuestBagMergeOwnershipError();
}
return pendingMerge.value;
}
if (items.value.length === 0) {
return null;
}
const prepared: PendingGuestBagMerge = {
key: newMergeKey(),
userId,
items: items.value.map((item) => ({
productId: item.productId,
skuId: item.skuId,
quantity: item.quantity,
})),
};
pendingMerge.value = prepared;
Eif (typeof localStorage !== "undefined") {
localStorage.setItem(PENDING_MERGE_KEY, JSON.stringify(prepared));
}
return prepared;
}
function completeMerge(key: string): boolean {
const prepared = pendingMerge.value;
Iif (!prepared || prepared.key !== key) {
return false;
}
for (const submitted of prepared.items) {
const index = items.value.findIndex((item) => item.skuId === submitted.skuId);
Iif (index < 0) {
continue;
}
const current = items.value[index];
if (!current || current.quantity <= submitted.quantity) {
items.value.splice(index, 1);
} else {
current.quantity -= submitted.quantity;
}
}
pendingMerge.value = null;
persist();
Eif (typeof localStorage !== "undefined") {
localStorage.removeItem(PENDING_MERGE_KEY);
}
return true;
}
return {
items,
pendingMerge,
itemCount,
subtotal,
addItem,
updateQuantity,
removeItem,
restoreItem,
prepareMerge,
completeMerge,
};
});
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