path: root/src/openvic-simulation/types/IdentifierRegistry.hpp

#pragma once

#include <map>
#include <vector>

#include "openvic-simulation/dataloader/NodeTools.hpp"
#include "openvic-simulation/utility/Logger.hpp"

#define REF_GETTERS(var) \
   constexpr decltype(var)& get_##var() { return var; } \
   constexpr decltype(var) const& get_##var() const { return var; }

namespace OpenVic {
   /*
    * Base class for objects with a non-empty string identifier,
    * uniquely named instances of which can be entered into an
    * IdentifierRegistry instance.
    */
   class HasIdentifier {
      const std::string identifier;

   protected:
      HasIdentifier(std::string_view new_identifier);

   public:
      HasIdentifier(HasIdentifier const&) = delete;
      HasIdentifier(HasIdentifier&&) = default;
      HasIdentifier& operator=(HasIdentifier const&) = delete;
      HasIdentifier& operator=(HasIdentifier&&) = delete;

      std::string_view get_identifier() const;
   };

   std::ostream& operator<<(std::ostream& stream, HasIdentifier const& obj);
   std::ostream& operator<<(std::ostream& stream, HasIdentifier const* obj);

   /*
    * Base class for objects with associated colour information.
    */
   class HasColour {
      const colour_t colour;

   protected:
      HasColour(const colour_t new_colour, bool can_be_null, bool can_have_alpha);

   public:
      HasColour(HasColour const&) = delete;
      HasColour(HasColour&&) = default;
      HasColour& operator=(HasColour const&) = delete;
      HasColour& operator=(HasColour&&) = delete;

      colour_t get_colour() const;
      std::string colour_to_hex_string() const;
   };

   /*
    * Base class for objects with a unique string identifier
    * and associated colour information.
    */
   class HasIdentifierAndColour : public HasIdentifier, public HasColour {
   protected:
      HasIdentifierAndColour(std::string_view new_identifier, const colour_t new_colour, bool can_be_null, bool can_have_alpha);

   public:
      HasIdentifierAndColour(HasIdentifierAndColour const&) = delete;
      HasIdentifierAndColour(HasIdentifierAndColour&&) = default;
      HasIdentifierAndColour& operator=(HasIdentifierAndColour const&) = delete;
      HasIdentifierAndColour& operator=(HasIdentifierAndColour&&) = delete;
   };

   template<typename T>
   using decimal_map_t = std::map<T, fixed_point_t>;

   template<typename T>
   constexpr typename decimal_map_t<T>::value_type get_largest_item(decimal_map_t<T> const& map) {
      constexpr auto pred = [](typename decimal_map_t<T>::value_type a, typename decimal_map_t<T>::value_type b) -> bool {
         return a.second < b.second;
      };
      const typename decimal_map_t<T>::const_iterator result = std::max_element(
         map.begin(), map.end(), pred
      );
      if (result != map.end()) {
         return *result;
      } else {
         return { nullptr, -1 };
      }
   }

   using distribution_t = decimal_map_t<HasIdentifierAndColour const*>;

   /* Callbacks for trying to add duplicate keys via UniqueKeyRegistry::add_item */
   static bool duplicate_fail_callback(std::string_view registry_name, std::string_view duplicate_identifier) {
      Logger::error("Failure adding item to the ", registry_name, " registry - an item with the identifier \"",
         duplicate_identifier, "\" already exists!");
      return false;
   }
   static bool duplicate_warning_callback(std::string_view registry_name, std::string_view duplicate_identifier) {
      Logger::warning("Warning adding item to the ", registry_name, " registry - an item with the identifier \"",
         duplicate_identifier, "\" already exists!");
      return true;
   }
   static bool duplicate_ignore_callback(std::string_view registry_name, std::string_view duplicate_identifier) {
      return true;
   }

   template<typename T>
   using get_identifier_func_t = std::string_view(T::*)(void) const;

   template<typename _Base, std::derived_from<_Base> _Type, get_identifier_func_t<_Base> get_identifier,
      typename _Storage, _Type* (*get_ptr)(_Storage&), _Type const* (*get_cptr)(_Storage const&)>
   class UniqueKeyRegistry {

      const std::string name;
      const bool log_lock;
      std::vector<_Storage> items;
      bool locked = false;
      string_map_t<size_t> identifier_index_map;

   public:
      using value_type = _Type;
      using storage_type = _Storage;

      UniqueKeyRegistry(std::string_view new_name, bool new_log_lock = true)
         : name { new_name }, log_lock { new_log_lock } {}

      std::string_view get_name() const {
         return name;
      }

      bool add_item(storage_type&& item, NodeTools::callback_t<std::string_view, std::string_view> duplicate_callback = duplicate_fail_callback) {
         if (locked) {
            Logger::error("Cannot add item to the ", name, " registry - locked!");
            return false;
         }
         value_type const* new_item = (*get_cptr)(item);
         const std::string_view new_identifier = (new_item->*get_identifier)();
         value_type const* old_item = get_item_by_identifier(new_identifier);
         if (old_item != nullptr) {
            return duplicate_callback(name, new_identifier);
         }
         identifier_index_map.emplace(new_identifier, items.size());
         items.push_back(std::move(item));
         return true;
      }

      void lock() {
         if (locked) {
            Logger::error("Failed to lock ", name, " registry - already locked!");
         } else {
            locked = true;
            if (log_lock) Logger::info("Locked ", name, " registry after registering ", size(), " items");
         }
      }

      bool is_locked() const {
         return locked;
      }

      void reset() {
         identifier_index_map.clear();
         items.clear();
         locked = false;
      }

      size_t size() const {
         return items.size();
      }

      bool empty() const {
         return items.empty();
      }

      void reserve(size_t size) {
         if (locked) {
            Logger::error("Failed to reserve space for ", size, " items in ", name, " registry - already locked!");
         } else {
            items.reserve(size);
         }
      }

      value_type* get_item_by_identifier(std::string_view identifier) {
         const typename decltype(identifier_index_map)::const_iterator it = identifier_index_map.find(identifier);
         if (it != identifier_index_map.end()) return (*get_ptr)(items[it->second]);
         return nullptr;
      }

      value_type const* get_item_by_identifier(std::string_view identifier) const {
         const typename decltype(identifier_index_map)::const_iterator it = identifier_index_map.find(identifier);
         if (it != identifier_index_map.end()) return (*get_cptr)(items[it->second]);
         return nullptr;
      }

      bool has_identifier(std::string_view identifier) const {
         return get_item_by_identifier(identifier) != nullptr;
      }

      value_type* get_item_by_index(size_t index) {
         return index < items.size() ? &items[index] : nullptr;
      }

      value_type const* get_item_by_index(size_t index) const {
         return index < items.size() ? &items[index] : nullptr;
      }

      bool has_index(size_t index) const {
         return get_item_by_index(index) != nullptr;
      }

      REF_GETTERS(items)

      std::vector<std::string_view> get_item_identifiers() const {
         std::vector<std::string_view> identifiers;
         identifiers.reserve(items.size());
         for (typename decltype(identifier_index_map)::value_type const& entry : identifier_index_map) {
            identifiers.push_back(entry.first);
         }
         return identifiers;
      }

      NodeTools::callback_t<std::string_view> expect_item_identifier(NodeTools::callback_t<value_type&> callback) {
         return [this, callback](std::string_view identifier) -> bool {
            value_type* item = get_item_by_identifier(identifier);
            if (item != nullptr) return callback(*item);
            Logger::error("Invalid ", name, ": ", identifier);
            return false;
         };
      }

      NodeTools::callback_t<std::string_view> expect_item_identifier(NodeTools::callback_t<value_type const&> callback) const {
         return [this, callback](std::string_view identifier) -> bool {
            value_type const* item = get_item_by_identifier(identifier);
            if (item != nullptr) return callback(*item);
            Logger::error("Invalid ", name, ": ", identifier);
            return false;
         };
      }

      NodeTools::node_callback_t expect_item_dictionary(NodeTools::callback_t<value_type&, ast::NodeCPtr> callback) {
         return NodeTools::expect_dictionary([this, callback](std::string_view key, ast::NodeCPtr value) -> bool {
            value_type* item = get_item_by_identifier(key);
            if (item != nullptr) {
               return callback(*item, value);
            }
            Logger::error("Invalid ", name, " identifier: ", key);
            return false;
         });
      }

      NodeTools::node_callback_t expect_item_dictionary(NodeTools::callback_t<value_type const&, ast::NodeCPtr> callback) const {
         return NodeTools::expect_dictionary([this, callback](std::string_view key, ast::NodeCPtr value) -> bool {
            value_type const* item = get_item_by_identifier(key);
            if (item != nullptr) {
               return callback(*item, value);
            }
            Logger::error("Invalid ", name, " identifier: ", key);
            return false;
         });
      }

      NodeTools::node_callback_t expect_item_decimal_map(NodeTools::callback_t<decimal_map_t<value_type const*>&&> callback) const {
         return [this, callback](ast::NodeCPtr node) -> bool {
            decimal_map_t<value_type const*> map;
            bool ret = expect_item_dictionary([&map](value_type const& key, ast::NodeCPtr value) -> bool {
               fixed_point_t val;
               const bool ret = NodeTools::expect_fixed_point(NodeTools::assign_variable_callback(val))(value);
               map.emplace(&key, val);
               return ret;
            })(node);
            ret &= callback(std::move(map));
            return ret;
         };
      }
   };

   template<typename T>
   [[nodiscard]] inline constexpr T* _addressof(T& v) noexcept {
      return std::addressof<T>(v);
   }

   template<typename T>
   const T* _addressof(const T&&) = delete;

   template<typename _Base, std::derived_from<_Base> _Type, get_identifier_func_t<_Base> get_identifier>
   using ValueRegistry = UniqueKeyRegistry<_Base, _Type, get_identifier, _Type, _addressof<_Type>, _addressof<const _Type>>;

   template<typename _Type>
   constexpr _Type* get_ptr(std::unique_ptr<_Type>& storage) {
      return storage.get();
   }
   template<typename _Type>
   constexpr _Type const* get_cptr(std::unique_ptr<_Type> const& storage) {
      return storage.get();
   }

   template<typename _Base, std::derived_from<_Base> _Type, get_identifier_func_t<_Base> get_identifier>
   using InstanceRegistry = UniqueKeyRegistry<_Base, _Type, get_identifier, std::unique_ptr<_Type>,
      get_ptr<_Type>, get_cptr<_Type>>;

   template<std::derived_from<HasIdentifier> _Type>
   using IdentifierRegistry = ValueRegistry<HasIdentifier, _Type, &HasIdentifier::get_identifier>;

   template<std::derived_from<HasIdentifier> _Type>
   using IdentifierInstanceRegistry = InstanceRegistry<HasIdentifier, _Type, &HasIdentifier::get_identifier>;

#define IDENTIFIER_REGISTRY_ACCESSORS_CUSTOM_PLURAL(singular, plural) \
   void lock_##plural() { plural.lock(); } \
   bool plural##_are_locked() const { return plural.is_locked(); } \
   decltype(plural)::value_type const* get_##singular##_by_identifier(std::string_view identifier) const { \
      return plural.get_item_by_identifier(identifier); } \
   bool has_##singular##_identifier(std::string_view identifier) const { \
      return plural.has_identifier(identifier); } \
   size_t get_##singular##_count() const { \
      return plural.size(); } \
   std::vector<decltype(plural)::storage_type> const& get_##plural() const { \
      return plural.get_items(); } \
   std::vector<std::string_view> get_##singular##_identifiers() const { \
      return plural.get_item_identifiers(); } \
   NodeTools::callback_t<std::string_view> expect_##singular##_identifier(NodeTools::callback_t<decltype(plural)::value_type const&> callback) const { \
      return plural.expect_item_identifier(callback); } \
   NodeTools::node_callback_t expect_##singular##_dictionary(NodeTools::callback_t<decltype(plural)::value_type const&, ast::NodeCPtr> callback) const { \
      return plural.expect_item_dictionary(callback); } \
   NodeTools::node_callback_t expect_##singular##_decimal_map(NodeTools::callback_t<decimal_map_t<decltype(plural)::value_type const*>&&> callback) const { \
      return plural.expect_item_decimal_map(callback); }

#define IDENTIFIER_REGISTRY_NON_CONST_ACCESSORS_CUSTOM_PLURAL(singular, plural) \
   decltype(plural)::value_type* get_##singular##_by_identifier(std::string_view identifier) { \
      return plural.get_item_by_identifier(identifier); } \
   NodeTools::callback_t<std::string_view> expect_##singular##_identifier(NodeTools::callback_t<decltype(plural)::value_type&> callback) { \
      return plural.expect_item_identifier(callback); } \
   NodeTools::node_callback_t expect_##singular##_dictionary(NodeTools::callback_t<decltype(plural)::value_type&, ast::NodeCPtr> callback) { \
      return plural.expect_item_dictionary(callback); }

#define IDENTIFIER_REGISTRY_ACCESSORS(name) IDENTIFIER_REGISTRY_ACCESSORS_CUSTOM_PLURAL(name, name##s)
#define IDENTIFIER_REGISTRY_NON_CONST_ACCESSORS(name) IDENTIFIER_REGISTRY_NON_CONST_ACCESSORS_CUSTOM_PLURAL(name, name##s)
}