Refactor BiergartenDataGenerator to use dependency injection container

pipeline/src/services/wikipedia/get_summary.cpp

@@ -0,0 +1,54 @@
+/**
+ * @file wikipedia/get_summary.cpp
+ * @brief WikipediaService::GetLocationContext() implementation.
+ */
+
+#include <spdlog/spdlog.h>
+
+#include <string>
+
+#include "services/wikipedia_service.h"
+
+auto WikipediaService::GetLocationContext(const Location& loc) -> std::string {
+   const std::string cache_key = loc.city + "|" + loc.country;
+   const auto cache_it = cache_.find(cache_key);
+   if (cache_it != cache_.end()) {
+      return cache_it->second;
+   }
+
+   std::string result;
+
+   if (!client_) {
+      cache_.emplace(cache_key, result);
+      return result;
+   }
+
+   std::string region_query(loc.city);
+   if (!loc.country.empty()) {
+      region_query += ", ";
+      region_query += loc.country;
+   }
+
+   const std::string beer_query = "beer in " + loc.country;
+
+   try {
+      const std::string region_extract = FetchExtract(region_query);
+      const std::string beer_extract = FetchExtract(beer_query);
+
+      if (!region_extract.empty()) {
+         result += region_extract;
+      }
+      if (!beer_extract.empty()) {
+         if (!result.empty()) {
+            result += "\n\n";
+         }
+         result += beer_extract;
+      }
+   } catch (const std::runtime_error& e) {
+      spdlog::debug("WikipediaService lookup failed for '{}': {}", region_query,
+                    e.what());
+   }
+
+   cache_.emplace(cache_key, result);
+   return result;
+}