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import { defineStore } from "pinia";
import {
ApiError,
createApiClient,
createTradeApi,
multiplyMoney,
sumMoney,
type BusinessId,
type CartItem,
type PutCartItemInput,
type TradeApi,
} from "@plain-journal/foundation";
const apiBaseUrl = import.meta.env.VITE_API_BASE_URL?.trim() ?? "";
export interface AccountCartAccessContext {
authenticated: boolean;
ownerId: BusinessId | null;
accessToken: string | null;
}
interface ActiveAccountCartAccess {
ownerId: BusinessId;
accessToken: string;
revision: number;
}
export type AccountCartMutationStatus =
| "idle"
| "pending"
| "succeeded"
| "unknown"
| "failed";
export class AccountCartAccessChangedError extends Error {
constructor() {
super("账户或会话已切换，旧的购物车请求结果不会写入当前页面。");
this.name = "AccountCartAccessChangedError";
}
}
export class AccountCartMutationBusyError extends Error {
constructor() {
super("上一项购物车修改仍在确认，请稍候。");
this.name = "AccountCartMutationBusyError";
}
}
class AccountCartResponseMismatchError extends Error {
constructor() {
super("Trade 已响应，但返回的购物车项与本次请求不一致。");
this.name = "AccountCartResponseMismatchError";
}
}
function isActiveContext(context: AccountCartAccessContext): context is {
authenticated: true;
ownerId: BusinessId;
accessToken: string;
} {
return context.authenticated
&& typeof context.ownerId === "string"
&& context.ownerId.length > 0
&& typeof context.accessToken === "string"
&& context.accessToken.length > 0;
}
function tradeApi(accessToken: string): TradeApi {
return createTradeApi(createApiClient({
baseUrl: apiBaseUrl,
timeoutMs: 8000,
tokenProvider: () => accessToken,
}));
}
function resultMayBeUnknown(cause: unknown): boolean {
return cause instanceof AccountCartResponseMismatchError
|| (cause instanceof ApiError && (
cause.kind === "network"
|| cause.kind === "timeout"
|| cause.kind === "invalid-response"
|| (cause.kind === "http" && (cause.status ?? 500) >= 500)
));
}
export const useAccountCartStore = defineStore("account-cart", () => {
const items = ref<CartItem[]>([]);
const loading = ref(false);
const mutatingSkuId = ref<BusinessId | null>(null);
const error = ref<string | null>(null);
const mutationStatus = ref<AccountCartMutationStatus>("idle");
const mutationMessage = ref<string | null>(null);
const activeOwnerId = ref<BusinessId | null>(null);
let activeAccessToken: string | null = null;
let accessRevision = 0;
let loadRevision = 0;
let mutationRevision = 0;
let activeLoadPromise: Promise<void> | null = null;
let activeLoadAccessRevision = -1;
const selectedItems = computed(() => items.value.filter((item) => item.selected));
const itemCount = computed(() => items.value.reduce(
(total, item) => total + item.quantity,
0,
));
const selectedItemCount = computed(() => selectedItems.value.reduce(
(total, item) => total + item.quantity,
0,
));
const selectedSubtotal = computed(() => sumMoney(
selectedItems.value.map((item) => multiplyMoney(item.unitPrice, item.quantity)),
));
const mutating = computed(() => mutatingSkuId.value !== null);
function synchronizeAccess(
context: AccountCartAccessContext,
): ActiveAccountCartAccess | null {
const nextOwnerId = isActiveContext(context) ? context.ownerId : null;
const nextAccessToken = isActiveContext(context) ? context.accessToken : null;
const ownerChanged = activeOwnerId.value !== nextOwnerId;
const tokenChanged = activeAccessToken !== nextAccessToken;
const accessChanged = ownerChanged || tokenChanged;
if (accessChanged) {
const interruptedMutation = mutatingSkuId.value !== null;
activeOwnerId.value = nextOwnerId;
activeAccessToken = nextAccessToken;
accessRevision += 1;
loadRevision += 1;
mutationRevision += 1;
activeLoadPromise = null;
activeLoadAccessRevision = -1;
loading.value = false;
mutatingSkuId.value = null;
error.value = null;
if (ownerChanged) {
items.value = [];
mutationStatus.value = "idle";
mutationMessage.value = null;
} else Eif (interruptedMutation) {
mutationStatus.value = "unknown";
mutationMessage.value = "会话凭据更新时购物车修改仍在进行，请重新读取 Trade 事实。";
}
}
if (!isActiveContext(context)) {
items.value = [];
return null;
}
return {
ownerId: context.ownerId,
accessToken: context.accessToken,
revision: accessRevision,
};
}
function accessIsCurrent(access: ActiveAccountCartAccess): boolean {
return access.revision === accessRevision
&& access.ownerId === activeOwnerId.value
&& access.accessToken === activeAccessToken;
}
function requireCurrent(access: ActiveAccountCartAccess) {
if (!accessIsCurrent(access)) {
throw new AccountCartAccessChangedError();
}
}
function load(
context: AccountCartAccessContext,
options: { force?: boolean } = {},
): Promise<void> {
const access = synchronizeAccess(context);
if (!access) {
return Promise.resolve();
}
if (
!options.force
&& activeLoadPromise
&& activeLoadAccessRevision === access.revision
) {
return activeLoadPromise;
}
Iif (mutatingSkuId.value) {
return Promise.reject(new AccountCartMutationBusyError());
}
const requestRevision = ++loadRevision;
loading.value = true;
error.value = null;
const request = (async () => {
try {
const result = await tradeApi(access.accessToken).cartItems();
requireCurrent(access);
if (requestRevision !== loadRevision) {
throw new AccountCartAccessChangedError();
}
items.value = result;
if (mutationStatus.value === "unknown") {
mutationStatus.value = "idle";
mutationMessage.value = null;
}
} catch (cause) {
Eif (!accessIsCurrent(access) || requestRevision !== loadRevision) {
throw new AccountCartAccessChangedError();
}
error.value = cause instanceof Error ? cause.message : "账户购物车暂时无法读取。";
throw cause;
} finally {
if (accessIsCurrent(access) && requestRevision === loadRevision) {
loading.value = false;
activeLoadPromise = null;
activeLoadAccessRevision = -1;
}
}
})();
activeLoadPromise = request;
activeLoadAccessRevision = access.revision;
return request;
}
async function updateItem(
context: AccountCartAccessContext,
item: CartItem,
input: Pick<PutCartItemInput, "quantity" | "selected">,
): Promise<CartItem> {
const quantity = Math.trunc(input.quantity);
Iif (!Number.isFinite(quantity) || quantity < 1 || quantity > 1_000_000_000) {
throw new Error("购物车数量必须是 1 到 1000000000 之间的整数。");
}
return mutate(
context,
item.skuId,
async (api) => {
const updated = await api.putCartItem(item.skuId, {
productId: item.productId,
quantity,
selected: input.selected,
});
Iif (updated.skuId !== item.skuId || updated.productId !== item.productId) {
throw new AccountCartResponseMismatchError();
}
const index = items.value.findIndex((candidate) =>
candidate.skuId === item.skuId);
Iif (index < 0) {
items.value.push(updated);
} else {
items.value[index] = updated;
}
return updated;
},
"购物车修改已由 Trade 确认。",
);
}
async function removeItem(
context: AccountCartAccessContext,
item: CartItem,
): Promise<void> {
await mutate(
context,
item.skuId,
async (api) => {
await api.removeCartItem(item.skuId);
items.value = items.value.filter((candidate) => candidate.skuId !== item.skuId);
},
"商品已从账户购物车移出。",
);
}
async function mutate<Result>(
context: AccountCartAccessContext,
skuId: BusinessId,
operation: (api: TradeApi) => Promise<Result>,
successMessage: string,
): Promise<Result> {
const access = synchronizeAccess(context);
Iif (!access) {
const cause = new Error("当前会话没有可用于管理购物车的账户事实。");
error.value = cause.message;
throw cause;
}
if (mutatingSkuId.value) {
throw new AccountCartMutationBusyError();
}
loadRevision += 1;
activeLoadPromise = null;
activeLoadAccessRevision = -1;
loading.value = false;
const requestRevision = ++mutationRevision;
mutatingSkuId.value = skuId;
error.value = null;
mutationStatus.value = "pending";
mutationMessage.value = "正在等待 Trade 确认购物车事实。";
try {
const result = await operation(tradeApi(access.accessToken));
requireCurrent(access);
Iif (requestRevision !== mutationRevision) {
throw new AccountCartAccessChangedError();
}
mutationStatus.value = "succeeded";
mutationMessage.value = successMessage;
return result;
} catch (cause) {
Iif (!accessIsCurrent(access) || requestRevision !== mutationRevision) {
throw new AccountCartAccessChangedError();
}
if (resultMayBeUnknown(cause)) {
mutationStatus.value = "unknown";
mutationMessage.value = "购物车修改结果尚未确认。请先重新读取 Trade 事实，不要连续重复操作。";
} else E{
mutationStatus.value = "failed";
mutationMessage.value = cause instanceof Error
? cause.message
: "购物车修改未完成。";
}
throw cause;
} finally {
Eif (accessIsCurrent(access) && requestRevision === mutationRevision) {
mutatingSkuId.value = null;
}
}
}
return {
items,
loading,
mutating,
mutatingSkuId,
error,
mutationStatus,
mutationMessage,
activeOwnerId,
selectedItems,
itemCount,
selectedItemCount,
selectedSubtotal,
load,
updateItem,
removeItem,
};
});
|