feat(domain): add income calculation with commission support

lib/domain/income.ts

@@ -0,0 +1,33 @@
+import type { Shop } from "@/lib/types"
+
+type ShopCommission = Pick<Shop, "commissionType" | "commissionValue">
+
+export interface IncomeCalculation {
+  income: number
+  commissionLabel: string
+}
+
+function roundCurrency(amount: number) {
+  return Number(amount.toFixed(2))
+}
+
+export function calculateOrderIncome(totalPrice: number, shop?: ShopCommission): IncomeCalculation {
+  if (!shop) {
+    return {
+      income: roundCurrency(totalPrice),
+      commissionLabel: "独立接单无抽成",
+    }
+  }
+
+  if (shop.commissionType === "percentage") {
+    return {
+      income: roundCurrency(totalPrice * (1 - shop.commissionValue / 100)),
+      commissionLabel: `扣除${shop.commissionValue}%抽成`,
+    }
+  }
+
+  return {
+    income: roundCurrency(Math.max(0, totalPrice - shop.commissionValue)),
+    commissionLabel: `扣除¥${shop.commissionValue}固定抽成`,
+  }
+}

store/wallet.ts

@@ -1,6 +1,8 @@
 import { create } from "zustand"
+import { calculateOrderIncome } from "@/lib/domain/income"
 import { generateId } from "@/lib/id"
 import { mockTransactions, walletBalance } from "@/lib/mock"
+import { useShopStore } from "@/store/shops"
 import type { WalletTransaction } from "@/lib/types"
 
 interface WalletState {
@@ -10,7 +12,7 @@ interface WalletState {
   withdraw: (amount: number) => void
   deductBalance: (orderId: string, amount: number) => boolean
   refundPayment: (orderId: string, amount: number) => boolean
-  addIncome: (orderId: string, amount: number) => void
+  addIncome: (orderId: string, totalPrice: number, shopId?: string) => void
   addTransaction: (transaction: WalletTransaction) => void
 }
 
@@ -109,8 +111,8 @@ export const useWalletStore = create<WalletState>((set, get) => ({
 
     return true
   },
-  addIncome: (orderId, amount) => {
+  addIncome: (orderId, totalPrice, shopId) => {
-    if (!Number.isFinite(amount) || amount <= 0) return
+    if (!Number.isFinite(totalPrice) || totalPrice <= 0) return
 
     const state = get()
     const exists = state.transactions.some(
@@ -118,15 +120,19 @@ export const useWalletStore = create<WalletState>((set, get) => ({
     )
     if (exists) return
 
+    const shop = shopId
+      ? useShopStore.getState().shops.find((item) => item.id === shopId)
+      : undefined
+    const { income, commissionLabel } = calculateOrderIncome(totalPrice, shop)
+
     const now = new Date().toISOString()
-    const income = Number((amount * 0.85).toFixed(2))
     set((prev) => ({
       transactions: [
         {
           id: generateId("tx"),
           type: "income",
           amount: income,
-          description: `订单 ${orderId} 收入（扣除15%抽成）`,
+          description: `订单 ${orderId} 收入（${commissionLabel}）`,
           createdAt: now,
         },
         ...prev.transactions,

tests/income-calculation.test.ts

@@ -0,0 +1,46 @@
+import { describe, expect, it } from "vitest"
+import { calculateOrderIncome } from "@/lib/domain/income"
+
+describe("calculateOrderIncome", () => {
+  it("calculates percentage commission income", () => {
+    const result = calculateOrderIncome(100, {
+      commissionType: "percentage",
+      commissionValue: 12,
+    })
+
+    expect(result).toEqual({
+      income: 88,
+      commissionLabel: "扣除12%抽成",
+    })
+  })
+
+  it("calculates fixed commission income", () => {
+    const result = calculateOrderIncome(60, {
+      commissionType: "fixed",
+      commissionValue: 8,
+    })
+
+    expect(result).toEqual({
+      income: 52,
+      commissionLabel: "扣除¥8固定抽成",
+    })
+  })
+
+  it("keeps full income for independent orders", () => {
+    const result = calculateOrderIncome(90)
+
+    expect(result).toEqual({
+      income: 90,
+      commissionLabel: "独立接单无抽成",
+    })
+  })
+
+  it("does not return negative income for fixed commission", () => {
+    const result = calculateOrderIncome(6, {
+      commissionType: "fixed",
+      commissionValue: 8,
+    })
+
+    expect(result.income).toBe(0)
+  })
+})