feat: rebuild CSP practice workflow, UX and automation

backend/src/controllers/leaderboard_controller.cc

@@ -0,0 +1,57 @@
+#include "csp/controllers/leaderboard_controller.h"
+
+#include "csp/app_state.h"
+#include "csp/domain/json.h"
+#include "csp/services/user_service.h"
+
+#include <algorithm>
+#include <exception>
+#include <string>
+
+namespace csp::controllers {
+
+namespace {
+
+drogon::HttpResponsePtr JsonError(drogon::HttpStatusCode code,
+                                  const std::string& msg) {
+  Json::Value j;
+  j["ok"] = false;
+  j["error"] = msg;
+  auto resp = drogon::HttpResponse::newHttpJsonResponse(j);
+  resp->setStatusCode(code);
+  return resp;
+}
+
+drogon::HttpResponsePtr JsonOkArray(const Json::Value& arr) {
+  Json::Value j;
+  j["ok"] = true;
+  j["data"] = arr;
+  auto resp = drogon::HttpResponse::newHttpJsonResponse(j);
+  resp->setStatusCode(drogon::k200OK);
+  return resp;
+}
+
+}  // namespace
+
+void LeaderboardController::global(
+    const drogon::HttpRequestPtr& req,
+    std::function<void(const drogon::HttpResponsePtr&)>&& cb) {
+  try {
+    int limit = 100;
+    const auto limit_str = req->getParameter("limit");
+    if (!limit_str.empty()) {
+      limit = std::max(1, std::min(500, std::stoi(limit_str)));
+    }
+
+    services::UserService users(csp::AppState::Instance().db());
+    const auto rows = users.GlobalLeaderboard(limit);
+
+    Json::Value arr(Json::arrayValue);
+    for (const auto& r : rows) arr.append(domain::ToJson(r));
+    cb(JsonOkArray(arr));
+  } catch (const std::exception& e) {
+    cb(JsonError(drogon::k500InternalServerError, e.what()));
+  }
+}
+
+}  // namespace csp::controllers