Add user generation feature

tooling/pipeline/src/data_model/names_by_country.cc

@@ -0,0 +1,41 @@
+/**
+ * @file data_model/names_by_country.cc
+ * @brief NamesByCountry::SampleName() implementation.
+ */
+
+#include "data_model/names_by_country.h"
+
+#include <utility>
+
+NamesByCountry::NamesByCountry(
+    std::unordered_map<std::string, std::vector<ForenameEntry>>
+        forenames_by_country,
+    std::unordered_map<std::string, std::vector<std::string>>
+        surnames_by_country)
+    : forenames_by_country_(std::move(forenames_by_country)),
+      surnames_by_country_(std::move(surnames_by_country)) {}
+
+std::optional<Name> NamesByCountry::SampleName(const std::string& iso3166_1,
+                                               std::mt19937& rng) const {
+  const auto forenames_it = forenames_by_country_.find(iso3166_1);
+  const auto surnames_it = surnames_by_country_.find(iso3166_1);
+
+  if (forenames_it == forenames_by_country_.end() ||
+      surnames_it == surnames_by_country_.end() ||
+      forenames_it->second.empty() || surnames_it->second.empty()) {
+    return std::nullopt;
+  }
+
+  const std::vector<ForenameEntry>& forenames = forenames_it->second;
+  const std::vector<std::string>& surnames = surnames_it->second;
+
+  std::uniform_int_distribution<size_t> forename_dist(0,
+                                                       forenames.size() - 1);
+  std::uniform_int_distribution<size_t> surname_dist(0, surnames.size() - 1);
+
+  const ForenameEntry& forename = forenames[forename_dist(rng)];
+
+  return Name{.first_name = forename.name,
+              .last_name = surnames[surname_dist(rng)],
+              .gender = forename.gender};
+}