Move pipeline directory

tooling/pipeline/src/json_handling/json_loader.cc

@@ -0,0 +1,110 @@
+/**
+ * @file json_handling/json_loader.cc
+ * @brief Parses curated location JSON input into strongly typed Location
+ * records with strict field validation and descriptive error reporting.
+ */
+
+#include "json_handling/json_loader.h"
+
+#include <spdlog/spdlog.h>
+
+#include <boost/json.hpp>
+#include <fstream>
+#include <sstream>
+#include <stdexcept>
+#include <string>
+#include <string_view>
+
+static std::string ReadRequiredString(const boost::json::object& object,
+                                      const char* key) {
+  const boost::json::value* value = object.if_contains(key);
+  if (value == nullptr || !value->is_string()) {
+    throw std::runtime_error(std::string("Missing or invalid string field: ") +
+                             key);
+  }
+  const std::string_view text = value->as_string();
+  return std::string(text);
+}
+
+static double ReadRequiredNumber(const boost::json::object& object,
+                                 const char* key) {
+  const boost::json::value* value = object.if_contains(key);
+  if (value == nullptr || !value->is_number()) {
+    throw std::runtime_error(std::string("Missing or invalid numeric field: ") +
+                             key);
+  }
+  return value->to_number<double>();
+}
+
+static std::vector<std::string> ReadRequiredStringArray(
+    const boost::json::object& object, const char* key) {
+  const boost::json::value* value = object.if_contains(key);
+  if (value == nullptr || !value->is_array()) {
+    throw std::runtime_error(
+        std::string("Missing or invalid string array field: ") + key);
+  }
+
+  const auto& array = value->as_array();
+  std::vector<std::string> items;
+  items.reserve(array.size());
+  for (const auto& item : array) {
+    if (!item.is_string()) {
+      throw std::runtime_error(
+          std::string("Missing or invalid string array field: ") + key);
+    }
+    items.emplace_back(item.as_string());
+  }
+  return items;
+}
+
+std::vector<Location> JsonLoader::LoadLocations(
+    const std::filesystem::path& filepath) {
+  std::ifstream input(filepath);
+  if (!input.is_open()) {
+    throw std::runtime_error("Failed to open locations file: " +
+                             filepath.string());
+  }
+
+  std::stringstream buffer;
+  buffer << input.rdbuf();
+  const std::string content = buffer.str();
+
+  boost::system::error_code error;
+  boost::json::value root = boost::json::parse(content, error);
+  if (error) {
+    throw std::runtime_error("Failed to parse locations JSON: " +
+                             error.message());
+  }
+
+  if (!root.is_array()) {
+    throw std::runtime_error(
+        "Invalid locations JSON: root element must be an array");
+  }
+
+  std::vector<Location> locations;
+  const auto& items = root.as_array();
+  locations.reserve(items.size());
+
+  for (const auto& item : items) {
+    if (!item.is_object()) {
+      throw std::runtime_error(
+          "Invalid locations JSON: each entry must be an object");
+    }
+
+    const auto& object = item.as_object();
+    locations.push_back(Location{
+        .city = ReadRequiredString(object, "city"),
+        .state_province = ReadRequiredString(object, "state_province"),
+        .iso3166_2 = ReadRequiredString(object, "iso3166_2"),
+        .country = ReadRequiredString(object, "country"),
+        .iso3166_1 = ReadRequiredString(object, "iso3166_1"),
+        .local_languages = ReadRequiredStringArray(object, "local_languages"),
+        .latitude = ReadRequiredNumber(object, "latitude"),
+        .longitude = ReadRequiredNumber(object, "longitude"),
+    });
+  }
+
+  spdlog::info("[JsonLoader] Loaded {} locations from {}", locations.size(),
+               filepath.string());
+  return locations;
+}