重构初始化

app/http/mer/controller/account/AccountController.php

@@ -0,0 +1,47 @@
+<?php
+
+namespace app\http\mer\controller\account;
+
+use app\common\base\BaseController;
+use app\http\mer\validation\BalanceValidator;
+use app\service\account\funds\MerchantAccountService;
+use app\service\merchant\MerchantService;
+use support\Request;
+use support\Response;
+
+/**
+ * 商户账户控制器。
+ *
+ * 负责商户余额查询等账户类接口。
+ */
+class AccountController extends BaseController
+{
+    /**
+     * 构造函数，注入商户与账户服务。
+     */
+    public function __construct(
+        protected MerchantService $merchantService,
+        protected MerchantAccountService $merchantAccountService
+    ) {
+    }
+
+    /**
+     * GET /mer/merchant/{merchantNo}/balance
+     *
+     * 查询商户余额。
+     */
+    public function balance(Request $request, string $merchantNo): Response
+    {
+        $data = $this->validated(['merchant_no' => $merchantNo], BalanceValidator::class, 'show');
+
+        $currentMerchantNo = $this->currentMerchantNo($request);
+        if ($currentMerchantNo !== '' && $currentMerchantNo !== (string) $data['merchant_no']) {
+            return $this->fail('无权查看该商户余额', 403);
+        }
+
+        $merchant = $this->merchantService->findEnabledMerchantByNo((string) $data['merchant_no']);
+
+        return $this->success($this->merchantAccountService->getBalanceSnapshot((int) $merchant->id));
+    }
+}
+