#ifndef FESA_CORE_SOURCE_IDENTITY_H_
#define FESA_CORE_SOURCE_IDENTITY_H_

#include <cstddef>
#include <cstdint>
#include <filesystem>
#include <string>

namespace fesa {

/// @brief Identifies a semantic entity by its stable collection position.
using EntityIndex = std::uint32_t;

/// @brief Identifies the input location that produced an item or diagnostic.
struct SourceLocation {
  std::filesystem::path file;
  std::size_t line;
};

/// @brief Preserves semantic and raw-text forms of a source entity identity.
struct SourceEntityId {
  std::string instance_name;
  std::int64_t source_label;
  std::string source_label_text;
};

/// @brief Compares all preserved source fields without canonicalizing spelling.
inline bool SourceIdentityEquals(const SourceEntityId& left,
                                const SourceEntityId& right) noexcept {
  return left.instance_name == right.instance_name &&
         left.source_label == right.source_label &&
         left.source_label_text == right.source_label_text;
}

}  // namespace fesa

#endif  // FESA_CORE_SOURCE_IDENTITY_H_