Create biergarten brewery pipeline project (#199)

pipeline/includes/services/wikipedia_service.h

@@ -0,0 +1,33 @@
+#ifndef BIERGARTEN_PIPELINE_INCLUDES_SERVICES_WIKIPEDIA_SERVICE_H_
+#define BIERGARTEN_PIPELINE_INCLUDES_SERVICES_WIKIPEDIA_SERVICE_H_
+
+/**
+ * @file services/wikipedia_service.h
+ * @brief Wikipedia summary retrieval service with in-memory caching.
+ */
+
+#include <memory>
+#include <string>
+#include <string_view>
+#include <unordered_map>
+
+#include "services/enrichment_service.h"
+#include "web_client/web_client.h"
+
+/// @brief Provides Wikipedia summary lookups backed by cached raw extracts.
+class WikipediaService final : public IEnrichmentService {
+ public:
+  /// @brief Creates a new Wikipedia service with the provided web client.
+  explicit WikipediaService(std::unique_ptr<WebClient> client);
+
+  /// @brief Returns the Wikipedia-derived context for a location.
+  [[nodiscard]] std::string GetLocationContext(const Location& loc) override;
+
+ private:
+  std::string FetchExtract(std::string_view query);
+  std::unique_ptr<WebClient> client_;
+  /// @brief Canonical cache for raw Wikipedia query extracts.
+  std::unordered_map<std::string, std::string> extract_cache_;
+};
+
+#endif  // BIERGARTEN_PIPELINE_INCLUDES_SERVICES_WIKIPEDIA_SERVICE_H_