18 files changed, 1434 insertions, 0 deletions

diff --git a/extension/src/openvic2/Date.cpp b/extension/src/openvic2/Date.cpp
new file mode 100644
index 0000000..bb891fd
--- /dev/null
+++ b/extension/src/openvic2/Date.cpp
@@ -0,0 +1,161 @@
+#include "openvic2/Date.hpp"
+
+#include <cctype>
+#include <algorithm>
+
+#include "openvic2/Logger.hpp"
+
+using namespace OpenVic2;
+
+Timespan::Timespan(day_t value) : days{value} {}
+
+bool Timespan::operator<(Timespan other) const { return days < other.days; };
+bool Timespan::operator>(Timespan other) const { return days > other.days; };
+bool Timespan::operator<=(Timespan other) const { return days <= other.days; };
+bool Timespan::operator>=(Timespan other) const { return days >= other.days; };
+bool Timespan::operator==(Timespan other) const { return days == other.days; };
+bool Timespan::operator!=(Timespan other) const { return days != other.days; };
+
+Timespan Timespan::operator+(Timespan other) const { return days + other.days; }
+
+Timespan Timespan::operator-(Timespan other) const { return days - other.days; }
+
+Timespan Timespan::operator*(day_t factor) const { return days * factor; }
+
+Timespan Timespan::operator/(day_t factor) const { return days / factor; }
+
+Timespan& Timespan::operator+=(Timespan other) {
+	days += other.days;
+	return *this;
+}
+
+Timespan& Timespan::operator-=(Timespan other) {
+	days -= other.days;
+	return *this;
+}
+
+Timespan& Timespan::operator++() {
+	days++;
+	return *this;
+}
+
+Timespan Timespan::operator++(int) {
+	Timespan old = *this;
+	++(*this);
+	return old;
+}
+
+Timespan::operator day_t() const {
+	return days;
+}
+
+Timespan::operator double() const {
+	return days;
+}
+
+Timespan::operator std::string() const {
+	return std::to_string(days);
+}
+
+std::ostream& OpenVic2::operator<<(std::ostream& out, Timespan timespan) {
+	return out << static_cast<std::string>(timespan);
+}
+
+Timespan Date::_dateToTimespan(year_t year, month_t month, day_t day) {
+	month = std::clamp<month_t>(month, 1, MONTHS_IN_YEAR);
+	day = std::clamp<day_t>(day, 1, DAYS_IN_MONTH[month - 1]);
+	return year * DAYS_IN_YEAR + DAYS_UP_TO_MONTH[month - 1] + day - 1;
+}
+
+Date::Date(Timespan total_days) : timespan{ total_days } {
+	if (timespan < 0) {
+		Logger::error("Invalid timespan for date: ", timespan, " (cannot be negative)");
+		timespan = 0;
+	}
+}
+
+Date::Date(year_t year, month_t month, day_t day) : timespan{ _dateToTimespan(year, month, day) } {}
+
+Date::year_t Date::getYear() const {
+	return static_cast<Timespan::day_t>(timespan) / DAYS_IN_YEAR;
+}
+
+Date::month_t Date::getMonth() const {
+	return ((static_cast<Timespan::day_t>(timespan) % DAYS_IN_YEAR) / 32) + 1;
+}
+
+Date::day_t Date::getDay() const {
+	const Timespan::day_t days_in_year = static_cast<Timespan::day_t>(timespan) % DAYS_IN_YEAR;
+	return days_in_year - DAYS_UP_TO_MONTH[days_in_year / 32] + 1;
+}
+
+
+bool Date::operator<(Date other) const { return timespan < other.timespan; };
+bool Date::operator>(Date other) const { return timespan > other.timespan; };
+bool Date::operator<=(Date other) const { return timespan <= other.timespan; };
+bool Date::operator>=(Date other) const { return timespan >= other.timespan; };
+bool Date::operator==(Date other) const { return timespan == other.timespan; };
+bool Date::operator!=(Date other) const { return timespan != other.timespan; };
+
+Date Date::operator+(Timespan other) const { return timespan + other; }
+
+Timespan Date::operator-(Date other) const { return timespan - other.timespan; }
+
+Date& Date::operator+=(Timespan other) {
+	timespan += other;
+	return *this;
+}
+
+Date& Date::operator-=(Timespan other) {
+	timespan -= other;
+	return *this;
+}
+
+Date& Date::operator++() {
+	timespan++;
+	return *this;
+}
+
+Date Date::operator++(int) {
+	Date old = *this;
+	++(*this);
+	return old;
+}
+
+Date::operator std::string() const {
+	std::stringstream ss;
+	ss << *this;
+	return ss.str();
+}
+
+std::ostream& OpenVic2::operator<<(std::ostream& out, Date date) {
+	return out << (int) date.getYear() << '.' << (int) date.getMonth() << '.' << (int) date.getDay();
+}
+
+// Parsed from string of the form YYYY.MM.DD
+Date Date::from_string(std::string const& date) {
+	year_t year = 0;
+	month_t month = 1;
+	day_t day = 1;
+
+	size_t first_pos = 0;
+	while (first_pos < date.length() && std::isdigit(date[first_pos++]));
+	year = atoi(date.substr(0, first_pos).c_str());
+	if (first_pos < date.length()) {
+		if (date[first_pos] == '.') {
+			size_t second_pos = first_pos + 1;
+			while (second_pos < date.length() && std::isdigit(date[second_pos++]));
+			month = atoi(date.substr(first_pos, second_pos - first_pos).c_str());
+			if (second_pos < date.length()) {
+				if (date[second_pos] == '.') {
+					size_t third_pos = second_pos + 1;
+					while (third_pos < date.length() && std::isdigit(date[third_pos++]));
+					day = atoi(date.substr(second_pos, third_pos - second_pos).c_str());
+					if (third_pos < date.length())
+						Logger::error("Unexpected string \"", date.substr(third_pos), "\" at the end of date ", date);
+				} else Logger::error("Unexpected character \"", date[second_pos], "\" in date ", date);
+			}
+		} else Logger::error("Unexpected character \"", date[first_pos], "\" in date ", date);
+	}
+	return _dateToTimespan(year, month, day);
+};
diff --git a/extension/src/openvic2/Date.hpp b/extension/src/openvic2/Date.hpp
new file mode 100644
index 0000000..b19602b
--- /dev/null
+++ b/extension/src/openvic2/Date.hpp
@@ -0,0 +1,83 @@
+#pragma once
+
+#include <cstdint>
+#include <string>
+#include <ostream>
+
+namespace OpenVic2 {
+	// A relative period between points in time, measured in days
+	struct Timespan {
+		using day_t = int64_t;
+	private:
+		day_t days;
+	public:
+		Timespan(day_t value = 0);
+
+		bool operator<(Timespan other) const;
+		bool operator>(Timespan other) const;
+		bool operator<=(Timespan other) const;
+		bool operator>=(Timespan other) const;
+		bool operator==(Timespan other) const;
+		bool operator!=(Timespan other) const;
+
+		Timespan operator+(Timespan other) const;
+		Timespan operator-(Timespan other) const;
+		Timespan operator*(day_t factor) const;
+		Timespan operator/(day_t factor) const;
+		Timespan& operator+=(Timespan other);
+		Timespan& operator-=(Timespan other);
+		Timespan& operator++();
+		Timespan operator++(int);
+
+		explicit operator day_t() const;
+		explicit operator double() const;
+		explicit operator std::string() const;
+	};
+	std::ostream& operator<< (std::ostream& out, Timespan timespan);
+
+	// Represents an in-game date
+	// Note: Current implementation does not account for leap-years, or dates before Year 0
+	struct Date {
+		using year_t = uint16_t;
+		using month_t = uint8_t;
+		using day_t = uint8_t;
+
+		static constexpr Timespan::day_t MONTHS_IN_YEAR = 12;
+		static constexpr Timespan::day_t DAYS_IN_YEAR = 365;
+		static constexpr Timespan::day_t DAYS_IN_MONTH[MONTHS_IN_YEAR] = { 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 };
+		static constexpr Timespan::day_t DAYS_UP_TO_MONTH[MONTHS_IN_YEAR] = { 0, 31, 59, 90, 120, 151, 181, 212, 243, 273, 304, 334 };
+	private:
+		// Number of days since Jan 1st, Year 0
+		Timespan timespan;
+
+		static Timespan _dateToTimespan(year_t year, month_t month, day_t day);
+	public:
+		// The Timespan is considered to be the number of days since Jan 1st, Year 0
+		Date(Timespan total_days);
+		// Year month day specification
+		Date(year_t year = 0, month_t month = 1, day_t day = 1);
+
+		year_t getYear() const;
+		month_t getMonth() const;
+		day_t getDay() const;
+
+		bool operator<(Date other) const;
+		bool operator>(Date other) const;
+		bool operator<=(Date other) const;
+		bool operator>=(Date other) const;
+		bool operator==(Date other) const;
+		bool operator!=(Date other) const;
+
+		Date operator+(Timespan other) const;
+		Timespan operator-(Date other) const;
+		Date& operator+=(Timespan other);
+		Date& operator-=(Timespan other);
+		Date& operator++();
+		Date operator++(int);
+
+		explicit operator std::string() const;
+		// Parsed from string of the form YYYY.MM.DD
+		static Date from_string(std::string const& date);
+	};
+	std::ostream& operator<< (std::ostream& out, Date date);
+}
diff --git a/extension/src/openvic2/GameAdvancementHook.cpp b/extension/src/openvic2/GameAdvancementHook.cpp
new file mode 100644
index 0000000..4b9bc25
--- /dev/null
+++ b/extension/src/openvic2/GameAdvancementHook.cpp
@@ -0,0 +1,72 @@
+#include "openvic2/GameAdvancementHook.hpp"
+
+using namespace OpenVic2;
+
+const std::vector<std::chrono::milliseconds> GameAdvancementHook::GAME_SPEEDS = {
+	std::chrono::milliseconds{ 4000 },
+	std::chrono::milliseconds{ 3000 },
+	std::chrono::milliseconds{ 2000 },
+	std::chrono::milliseconds{ 1000 },
+	std::chrono::milliseconds{ 100 },
+	std::chrono::milliseconds{ 1 } };
+
+GameAdvancementHook::GameAdvancementHook(AdvancementFunction tickFunction, RefreshFunction updateFunction, bool startPaused, speed_t startingSpeed)
+	: triggerFunction{ tickFunction }, refreshFunction{ updateFunction }, isPaused{ startPaused } {
+	lastPolledTime = std::chrono::high_resolution_clock::now();
+	setSimulationSpeed(startingSpeed);
+}
+
+void GameAdvancementHook::setSimulationSpeed(speed_t speed) {
+	if (speed < 0)
+		currentSpeed = 0;
+	else if (speed >= GAME_SPEEDS.size())
+		currentSpeed = GAME_SPEEDS.size() - 1;
+	else
+		currentSpeed = speed;
+}
+
+GameAdvancementHook::speed_t GameAdvancementHook::getSimulationSpeed() const {
+	return currentSpeed;
+}
+
+void GameAdvancementHook::increaseSimulationSpeed() {
+	setSimulationSpeed(currentSpeed + 1);
+}
+
+void GameAdvancementHook::decreaseSimulationSpeed() {
+	setSimulationSpeed(currentSpeed - 1);
+}
+
+bool GameAdvancementHook::canIncreaseSimulationSpeed() const {
+	return currentSpeed + 1 < GAME_SPEEDS.size();
+}
+
+bool GameAdvancementHook::canDecreaseSimulationSpeed() const {
+	return currentSpeed > 0;
+}
+
+GameAdvancementHook& GameAdvancementHook::operator++() {
+	increaseSimulationSpeed();
+	return *this;
+};
+
+GameAdvancementHook& GameAdvancementHook::operator--() {
+	decreaseSimulationSpeed();
+	return *this;
+};
+
+void GameAdvancementHook::conditionallyAdvanceGame() {
+	if (!isPaused) {
+		std::chrono::time_point<std::chrono::high_resolution_clock> currentTime = std::chrono::high_resolution_clock::now();
+		if (std::chrono::duration_cast<std::chrono::milliseconds>(currentTime - lastPolledTime) >= GAME_SPEEDS[currentSpeed]) {
+			lastPolledTime = currentTime;
+			if (triggerFunction) triggerFunction();
+		}
+	}
+	if (refreshFunction) refreshFunction();
+}
+
+void GameAdvancementHook::reset() {
+	isPaused = true;
+	currentSpeed = 0;
+}
diff --git a/extension/src/openvic2/GameAdvancementHook.hpp b/extension/src/openvic2/GameAdvancementHook.hpp
new file mode 100644
index 0000000..07f8414
--- /dev/null
+++ b/extension/src/openvic2/GameAdvancementHook.hpp
@@ -0,0 +1,42 @@
+#pragma once
+
+#include <chrono>
+#include <functional>
+#include <vector>
+
+namespace OpenVic2 {
+	//Conditionally advances game with provided behaviour
+	//Class governs game speed and pause state
+	class GameAdvancementHook {
+		public:
+		using AdvancementFunction = std::function<void()>;
+		using RefreshFunction = std::function<void()>;
+		using speed_t = int8_t;
+
+		//Minimum number of miliseconds before the simulation advances
+		static const std::vector<std::chrono::milliseconds> GAME_SPEEDS;
+
+		private:
+		std::chrono::time_point<std::chrono::high_resolution_clock> lastPolledTime;
+		//A function pointer that advances the simulation, intended to be a capturing lambda or something similar. May need to be reworked later
+		AdvancementFunction triggerFunction;
+		RefreshFunction refreshFunction;
+		speed_t currentSpeed;
+
+		public:
+		bool isPaused;
+
+		GameAdvancementHook(AdvancementFunction tickFunction, RefreshFunction updateFunction, bool startPaused = true, speed_t startingSpeed = 0);
+
+		void setSimulationSpeed(speed_t speed);
+		speed_t getSimulationSpeed() const;
+		void increaseSimulationSpeed();
+		void decreaseSimulationSpeed();
+		bool canIncreaseSimulationSpeed() const;
+		bool canDecreaseSimulationSpeed() const;
+		GameAdvancementHook& operator++();
+		GameAdvancementHook& operator--();
+		void conditionallyAdvanceGame();
+		void reset();
+	};
+}
\ No newline at end of file
diff --git a/extension/src/openvic2/GameManager.cpp b/extension/src/openvic2/GameManager.cpp
new file mode 100644
index 0000000..78992f1
--- /dev/null
+++ b/extension/src/openvic2/GameManager.cpp
@@ -0,0 +1,46 @@
+#include "openvic2/GameManager.hpp"
+
+#include "openvic2/Logger.hpp"
+
+using namespace OpenVic2;
+
+GameManager::GameManager(state_updated_func_t state_updated_callback)
+	: clock{ [this]() { tick(); }, [this]() { update_state(); } }, state_updated{ state_updated_callback } {}
+
+void GameManager::set_needs_update() {
+	needs_update = true;
+}
+
+void GameManager::update_state() {
+	if (needs_update) {
+		Logger::info("Update: ", today);
+		map.update_state(today);
+		if (state_updated) state_updated();
+		needs_update = false;
+	}
+}
+
+void GameManager::tick() {
+	today++;
+	Logger::info("Tick: ", today);
+	map.tick(today);
+	set_needs_update();
+}
+
+return_t GameManager::setup() {
+	clock.reset();
+	today = { 1836 };
+	set_needs_update();
+	return map.generate_province_buildings(building_manager);
+}
+
+Date const& GameManager::get_today() const {
+	return today;
+}
+
+return_t GameManager::expand_building(Province::index_t province_index, std::string const& building_type_identifier) {
+	set_needs_update();
+	Province* province = map.get_province_by_index(province_index);
+	if (province == nullptr) return FAILURE;
+	return province->expand_building(building_type_identifier);
+}
diff --git a/extension/src/openvic2/GameManager.hpp b/extension/src/openvic2/GameManager.hpp
new file mode 100644
index 0000000..65cd566
--- /dev/null
+++ b/extension/src/openvic2/GameManager.hpp
@@ -0,0 +1,29 @@
+#pragma once
+
+#include "openvic2/GameAdvancementHook.hpp"
+#include "openvic2/map/Map.hpp"
+
+namespace OpenVic2 {
+	struct GameManager {
+		using state_updated_func_t = std::function<void()>;
+
+		Map map;
+		BuildingManager building_manager;
+		GameAdvancementHook clock;
+	private:
+		Date today;
+		state_updated_func_t state_updated;
+		bool needs_update;
+
+		void set_needs_update();
+		void update_state();
+		void tick();
+	public:
+		GameManager(state_updated_func_t state_updated_callback);
+
+		return_t setup();
+
+		Date const& get_today() const;
+		return_t expand_building(Province::index_t province_index, std::string const& building_type_identifier);
+	};
+}
diff --git a/extension/src/openvic2/Logger.cpp b/extension/src/openvic2/Logger.cpp
new file mode 100644
index 0000000..56d74ab
--- /dev/null
+++ b/extension/src/openvic2/Logger.cpp
@@ -0,0 +1,26 @@
+#include "openvic2/Logger.hpp"
+
+#include <iostream>
+
+using namespace OpenVic2;
+
+Logger::log_func_t Logger::info_func = [](std::string&& str) { std::cout << str; };
+Logger::log_func_t Logger::error_func = [](std::string&& str) { std::cerr << str; };
+
+char const* Logger::get_filename(char const* filepath) {
+	if (filepath == nullptr) return nullptr;
+	char const* last_slash = filepath;
+	while (*filepath != '\0') {
+		if (*filepath == '\\' || *filepath == '/') last_slash = filepath + 1;
+		filepath++;
+	}
+	return last_slash;
+}
+
+void Logger::set_info_func(log_func_t log_func) {
+	info_func = log_func;
+}
+
+void Logger::set_error_func(log_func_t log_func) {
+	error_func = log_func;
+}
diff --git a/extension/src/openvic2/Logger.hpp b/extension/src/openvic2/Logger.hpp
new file mode 100644
index 0000000..624df29
--- /dev/null
+++ b/extension/src/openvic2/Logger.hpp
@@ -0,0 +1,83 @@
+#pragma once
+
+#include <functional>
+#include <sstream>
+#ifdef __cpp_lib_source_location
+#include <source_location>
+#endif
+
+namespace OpenVic2 {
+
+	#ifndef __cpp_lib_source_location
+	#include <string>
+	//Implementation of std::source_location for compilers that do not support it
+	//Note: uses non-standard extensions that are supported by Clang, GCC, and MSVC
+	//https://clang.llvm.org/docs/LanguageExtensions.html#source-location-builtins
+	//https://stackoverflow.com/a/67970107
+	class source_location {
+		std::string _file;
+		int _line;
+		std::string _function;
+
+		public:
+		source_location(std::string f, int l, std::string n) : _file(f), _line(l),  _function(n) {}
+		static source_location current(std::string f = __builtin_FILE(), int l = __builtin_LINE(), std::string n = __builtin_FUNCTION()) {
+			return source_location(f, l, n);
+		}
+
+		inline char const* file_name() const { return _file.c_str(); }
+		inline int line() const {return _line; }
+		inline char const* function_name() const { return _function.c_str(); }
+	};
+	#endif
+
+	class Logger {
+		using log_func_t = std::function<void(std::string&&)>;
+
+		#ifdef __cpp_lib_source_location
+		using source_location = std::source_location;
+		#else
+		using source_location = OpenVic2::source_location;
+		#endif
+
+		static log_func_t info_func, error_func;
+
+		static char const* get_filename(char const* filepath);
+
+		template <typename... Ts>
+		struct log {
+			log(log_func_t log_func, Ts&&... ts, const source_location& location) {
+				if (log_func) {
+					std::stringstream stream;
+					stream << std::endl << get_filename(location.file_name()) << "(" << location.line() << ") `" << location.function_name() << "`: ";
+					((stream << std::forward<Ts>(ts)), ...);
+					stream << std::endl;
+					log_func(stream.str());
+				}
+			}
+		};
+	public:
+		static void set_info_func(log_func_t log_func);
+		static void set_error_func(log_func_t log_func);
+
+		template <typename... Ts>
+		struct info {
+			info(Ts&&... ts, const source_location& location = source_location::current()) {
+				log<Ts...>{ info_func, std::forward<Ts>(ts)..., location };
+			}
+		};
+
+		template <typename... Ts>
+		info(Ts&&...) -> info<Ts...>;
+
+		template <typename... Ts>
+		struct error {
+			error(Ts&&... ts, const source_location& location = source_location::current()) {
+				log<Ts...>{ error_func, std::forward<Ts>(ts)..., location };
+			}
+		};
+
+		template <typename... Ts>
+		error(Ts&&...) -> error<Ts...>;
+	};
+}
diff --git a/extension/src/openvic2/Types.cpp b/extension/src/openvic2/Types.cpp
new file mode 100644
index 0000000..861ab50
--- /dev/null
+++ b/extension/src/openvic2/Types.cpp
@@ -0,0 +1,13 @@
+#include "openvic2/Types.hpp"
+
+#include <cassert>
+
+using namespace OpenVic2;
+
+HasIdentifier::HasIdentifier(std::string const& new_identifier) : identifier{ new_identifier } {
+	assert(!identifier.empty());
+}
+
+std::string const& HasIdentifier::get_identifier() const {
+	return identifier;
+}
diff --git a/extension/src/openvic2/Types.hpp b/extension/src/openvic2/Types.hpp
new file mode 100644
index 0000000..98e92ce
--- /dev/null
+++ b/extension/src/openvic2/Types.hpp
@@ -0,0 +1,100 @@
+#pragma once
+
+#include <string>
+#include <vector>
+
+#include "openvic2/Logger.hpp"
+
+namespace OpenVic2 {
+	using return_t = bool;
+	// This mirrors godot::Error, where `OK = 0` and `FAILED = 1`.
+	static constexpr return_t SUCCESS = false, FAILURE = true;
+
+	/*
+	 * 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 const& new_identifier);
+	public:
+		HasIdentifier(HasIdentifier const&) = delete;
+		HasIdentifier(HasIdentifier&&) = default;
+		HasIdentifier& operator=(HasIdentifier const&) = delete;
+		HasIdentifier& operator=(HasIdentifier&&) = delete;
+
+		std::string const& get_identifier() const;
+	};
+
+	/*
+	 * Template for a list of objects with unique string identifiers that can
+	 * be locked to prevent any further additions. The template argument T is
+	 * the type of object that the registry will store, and the second part ensures
+	 * that HasIdentifier is a base class of T.
+	 */
+	template<class T, typename std::enable_if<std::is_base_of<HasIdentifier, T>::value>::type* = nullptr>
+	class IdentifierRegistry {
+		const std::string name;
+		std::vector<T> items;
+		bool locked = false;
+	public:
+		IdentifierRegistry(std::string const& new_name) : name(new_name) {}
+		return_t add_item(T&& item) {
+			if (locked) {
+				Logger::error("Cannot add item to the ", name, " registry - locked!");
+				return FAILURE;
+			}
+			T const* old_item = get_item_by_identifier(item.get_identifier());
+			if (old_item != nullptr) {
+				Logger::error("Cannot add item to the ", name, " registry - an item with the identifier \"", item.get_identifier(), "\" already exists!");
+				return FAILURE;
+			}
+			items.push_back(std::move(item));
+			return SUCCESS;
+		}
+		void lock(bool log = true) {
+			if (locked) {
+				Logger::error("Failed to lock ", name, " registry - already locked!");
+			} else {
+				locked = true;
+				if (log) Logger::info("Locked ", name, " registry after registering ", get_item_count(), " items");
+			}
+		}
+		bool is_locked() const {
+			return locked;
+		}
+		void reset() {
+			items.clear();
+			locked = false;
+		}
+		size_t get_item_count() const {
+			return items.size();
+		}
+		T* get_item_by_identifier(std::string const& identifier) {
+			if (!identifier.empty())
+				for (T& item : items)
+					if (item.get_identifier() == identifier) return &item;
+			return nullptr;
+		}
+		T const* get_item_by_identifier(std::string const& identifier) const {
+			if (!identifier.empty())
+				for (T const& item : items)
+					if (item.get_identifier() == identifier) return &item;
+			return nullptr;
+		}
+		T* get_item_by_index(size_t index) {
+			return index < items.size() ? &items[index] : nullptr;
+		}
+		T const* get_item_by_index(size_t index) const {
+			return index < items.size() ? &items[index] : nullptr;
+		}
+		std::vector<T>& get_items() {
+			return items;
+		}
+		std::vector<T> const& get_items() const {
+			return items;
+		}
+	};
+}
diff --git a/extension/src/openvic2/map/Building.cpp b/extension/src/openvic2/map/Building.cpp
new file mode 100644
index 0000000..00e121b
--- /dev/null
+++ b/extension/src/openvic2/map/Building.cpp
@@ -0,0 +1,124 @@
+#include "openvic2/map/Building.hpp"
+
+#include <cassert>
+
+#include "openvic2/Logger.hpp"
+#include "openvic2/map/Province.hpp"
+
+using namespace OpenVic2;
+
+Building::Building(BuildingType const& new_type) : HasIdentifier{ new_type.get_identifier() }, type{ new_type } {}
+
+bool Building::_can_expand() const {
+	return level < type.get_max_level();
+}
+
+BuildingType const& Building::get_type() const {
+	return type;
+}
+
+Building::level_t Building::get_level() const {
+	return level;
+}
+
+Building::ExpansionState Building::get_expansion_state() const {
+	return expansion_state;
+}
+
+Date const& Building::get_start_date() const {
+	return start;
+}
+
+Date const& Building::get_end_date() const {
+	return end;
+}
+
+float Building::get_expansion_progress() const {
+	return expansion_progress;
+}
+
+return_t Building::expand() {
+	if (expansion_state == ExpansionState::CanExpand) {
+		expansion_state = ExpansionState::Preparing;
+		expansion_progress = 0.0f;
+		return SUCCESS;
+	}
+	return FAILURE;
+}
+
+/* REQUIREMENTS:
+ * MAP-71, MAP-74, MAP-77
+ */
+void Building::update_state(Date const& today) {
+	switch (expansion_state) {
+		case ExpansionState::Preparing:
+			start = today;
+			end = start + type.get_build_time();
+			break;
+		case ExpansionState::Expanding:
+			expansion_progress = static_cast<double>(today - start) / static_cast<double>(end - start);
+			break;
+		default: expansion_state = _can_expand() ? ExpansionState::CanExpand : ExpansionState::CannotExpand;
+	}
+}
+
+void Building::tick(Date const& today) {
+	if (expansion_state == ExpansionState::Preparing) {
+		expansion_state = ExpansionState::Expanding;
+	}
+	if (expansion_state == ExpansionState::Expanding) {
+		if (end <= today) {
+			level++;
+			expansion_state = ExpansionState::CannotExpand;
+		}
+	}
+}
+
+BuildingType::BuildingType(std::string const& new_identifier, Building::level_t new_max_level, Timespan new_build_time) :
+	HasIdentifier{ new_identifier }, max_level{ new_max_level }, build_time{ new_build_time } {
+	assert(new_max_level >= 0);
+	assert(build_time >= 0);
+}
+
+Building::level_t BuildingType::get_max_level() const {
+	return max_level;
+}
+
+Timespan BuildingType::get_build_time() const {
+	return build_time;
+}
+
+BuildingManager::BuildingManager() : building_types{ "building types" } {}
+
+return_t BuildingManager::add_building_type(std::string const& identifier, Building::level_t max_level, Timespan build_time) {
+	if (identifier.empty()) {
+		Logger::error("Invalid building type identifier - empty!");
+		return FAILURE;
+	}
+	if (max_level < 0) {
+		Logger::error("Invalid building type max level: ", max_level);
+		return FAILURE;
+	}
+	if (build_time < 0) {
+		Logger::error("Invalid building type build time: ", build_time);
+		return FAILURE;
+	}
+	return building_types.add_item({ identifier, max_level, build_time });
+}
+
+void BuildingManager::lock_building_types() {
+	building_types.lock();
+}
+
+BuildingType const* BuildingManager::get_building_type_by_identifier(std::string const& identifier) const {
+	return building_types.get_item_by_identifier(identifier);
+}
+
+return_t BuildingManager::generate_province_buildings(Province& province) const {
+	return_t ret = SUCCESS;
+	province.reset_buildings();
+	for (BuildingType const& type : building_types.get_items())
+		if (province.add_building(type) != SUCCESS) ret = FAILURE;
+	province.lock_buildings();
+	return ret;
+}
diff --git a/extension/src/openvic2/map/Building.hpp b/extension/src/openvic2/map/Building.hpp
new file mode 100644
index 0000000..1305014
--- /dev/null
+++ b/extension/src/openvic2/map/Building.hpp
@@ -0,0 +1,75 @@
+#pragma once
+
+#include <vector>
+
+#include "openvic2/Types.hpp"
+#include "openvic2/Date.hpp"
+
+namespace OpenVic2 {
+	struct Province;
+	struct BuildingType;
+
+	/* REQUIREMENTS:
+	 * MAP-11, MAP-72, MAP-73
+	 * MAP-12, MAP-75, MAP-76
+	 * MAP-13, MAP-78, MAP-79
+	 */
+	struct Building : HasIdentifier {
+		friend struct Province;
+
+		using level_t = int8_t;
+
+		enum class ExpansionState { CannotExpand, CanExpand, Preparing, Expanding };
+	private:
+		BuildingType const& type;
+		level_t level = 0;
+		ExpansionState expansion_state = ExpansionState::CannotExpand;
+		Date start, end;
+		float expansion_progress;
+
+		Building(BuildingType const& new_type);
+
+		bool _can_expand() const;
+	public:
+		Building(Building&&) = default;
+
+		BuildingType const& get_type() const;
+		level_t get_level() const;
+		ExpansionState get_expansion_state() const;
+		Date const& get_start_date() const;
+		Date const& get_end_date() const;
+		float get_expansion_progress() const;
+
+		return_t expand();
+		void update_state(Date const& today);
+		void tick(Date const& today);
+	};
+
+	struct BuildingManager;
+
+	struct BuildingType : HasIdentifier {
+		friend struct BuildingManager;
+	private:
+		const Building::level_t max_level;
+		const Timespan build_time;
+
+		BuildingType(std::string const& new_identifier, Building::level_t new_max_level, Timespan new_build_time);
+	public:
+		BuildingType(BuildingType&&) = default;
+
+		Building::level_t get_max_level() const;
+		Timespan get_build_time() const;
+	};
+
+	struct BuildingManager {
+	private:
+		IdentifierRegistry<BuildingType> building_types;
+	public:
+		BuildingManager();
+
+		return_t add_building_type(std::string const& identifier, Building::level_t max_level, Timespan build_time);
+		void lock_building_types();
+		BuildingType const* get_building_type_by_identifier(std::string const& identifier) const;
+		return_t generate_province_buildings(Province& province) const;
+	};
+}
diff --git a/extension/src/openvic2/map/Map.cpp b/extension/src/openvic2/map/Map.cpp
new file mode 100644
index 0000000..b5cf144
--- /dev/null
+++ b/extension/src/openvic2/map/Map.cpp
@@ -0,0 +1,320 @@
+#include "openvic2/map/Map.hpp"
+
+#include <cassert>
+#include <unordered_set>
+
+#include "openvic2/Logger.hpp"
+
+using namespace OpenVic2;
+
+Mapmode::Mapmode(index_t new_index, std::string const& new_identifier, colour_func_t new_colour_func)
+	: HasIdentifier{ new_identifier }, index{ new_index }, colour_func{ new_colour_func } {
+	assert(colour_func != nullptr);
+}
+
+Mapmode::index_t Mapmode::get_index() const {
+	return index;
+}
+
+Province::colour_t Mapmode::get_colour(Map const& map, Province const& province) const {
+	return colour_func ? colour_func(map, province) : Province::NULL_COLOUR;
+}
+
+Map::Map() : provinces{ "provinces" }, regions{ "regions" }, mapmodes{ "mapmodes" } {}
+
+return_t Map::add_province(std::string const& identifier, Province::colour_t colour) {
+	if (provinces.get_item_count() >= Province::MAX_INDEX) {
+		Logger::error("The map's province list is full - there can be at most ", Province::MAX_INDEX, " provinces");
+		return FAILURE;
+	}
+	if (identifier.empty()) {
+		Logger::error("Invalid province identifier - empty!");
+		return FAILURE;
+	}
+	if (colour == Province::NULL_COLOUR || colour > Province::MAX_COLOUR) {
+		Logger::error("Invalid province colour: ", Province::colour_to_hex_string(colour));
+		return FAILURE;
+	}
+	Province new_province{ static_cast<Province::index_t>(provinces.get_item_count() + 1), identifier, colour };
+	Province const* old_province = get_province_by_colour(colour);
+	if (old_province != nullptr) {
+		Logger::error("Duplicate province colours: ", old_province->to_string(), " and ", new_province.to_string());
+		return FAILURE;
+	}
+	return provinces.add_item(std::move(new_province));
+}
+
+void Map::lock_provinces() {
+	provinces.lock();
+}
+
+return_t Map::set_water_province(std::string const& identifier) {
+	if (water_provinces_locked) {
+		Logger::error("The map's water provinces have already been locked!");
+		return FAILURE;
+	}
+	Province* province = get_province_by_identifier(identifier);
+	if (province == nullptr) {
+		Logger::error("Unrecognised water province identifier: ", identifier);
+		return FAILURE;
+	}
+	if (province->is_water()) {
+		Logger::error("Province ", identifier, " is already a water province!");
+		return FAILURE;
+	}
+	province->water = true;
+	water_province_count++;
+	return SUCCESS;
+}
+
+void Map::lock_water_provinces() {
+	water_provinces_locked = true;
+	Logger::info("Locked water provinces after registering ", water_province_count);
+}
+
+return_t Map::add_region(std::string const& identifier, std::vector<std::string> const& province_identifiers) {
+	if (identifier.empty()) {
+		Logger::error("Invalid region identifier - empty!");
+		return FAILURE;
+	}
+	Region new_region{ identifier };
+	return_t ret = SUCCESS;
+	for (std::string const& province_identifier : province_identifiers) {
+		Province* province = get_province_by_identifier(province_identifier);
+		if (province != nullptr) {
+			if (new_region.contains_province(province)) {
+				Logger::error("Duplicate province identifier ", province_identifier);
+				ret = FAILURE;
+			} else {
+				size_t other_region_index = reinterpret_cast<size_t>(province->get_region());
+				if (other_region_index != 0) {
+					other_region_index--;
+					if (other_region_index < regions.get_item_count())
+						Logger::error("Province ", province_identifier, " is already part of ", regions.get_item_by_index(other_region_index)->get_identifier());
+					else
+						Logger::error("Province ", province_identifier, " is already part of an unknown region with index ", other_region_index);
+					ret = FAILURE;
+				} else new_region.provinces.insert(province);
+			}
+		} else {
+			Logger::error("Invalid province identifier ", province_identifier);
+			ret = FAILURE;
+		}
+	}
+	if (!new_region.get_province_count()) {
+		Logger::error("No valid provinces in region's list");
+		return FAILURE;
+	}
+
+	// Used to detect provinces listed in multiple regions, will
+	// be corrected once regions is stable (i.e. lock_regions).
+	Region* tmp_region_index = reinterpret_cast<Region*>(regions.get_item_count());
+	for (Province* province : new_region.get_provinces())
+		province->region = tmp_region_index;
+	if (regions.add_item(std::move(new_region)) != SUCCESS) ret = FAILURE;
+	return ret;
+}
+
+void Map::lock_regions() {
+	regions.lock();
+	for (Region& region : regions.get_items())
+		for (Province* province : region.get_provinces())
+			province->region = &region;
+}
+
+size_t Map::get_province_count() const {
+	return provinces.get_item_count();
+}
+
+Province* Map::get_province_by_index(Province::index_t index) {
+	return index != Province::NULL_INDEX ? provinces.get_item_by_index(index - 1) : nullptr;
+}
+
+Province const* Map::get_province_by_index(Province::index_t index) const {
+	return index != Province::NULL_INDEX ? provinces.get_item_by_index(index - 1) : nullptr;
+}
+
+Province* Map::get_province_by_identifier(std::string const& identifier) {
+	return provinces.get_item_by_identifier(identifier);
+}
+
+Province const* Map::get_province_by_identifier(std::string const& identifier) const {
+	return provinces.get_item_by_identifier(identifier);
+}
+
+Province* Map::get_province_by_colour(Province::colour_t colour) {
+	if (colour != Province::NULL_COLOUR)
+		for (Province& province : provinces.get_items())
+			if (province.get_colour() == colour) return &province;
+	return nullptr;
+}
+
+Province const* Map::get_province_by_colour(Province::colour_t colour) const {
+	if (colour != Province::NULL_COLOUR)
+		for (Province const& province : provinces.get_items())
+			if (province.get_colour() == colour) return &province;
+	return nullptr;
+}
+
+Province::index_t Map::get_province_index_at(size_t x, size_t y) const {
+	if (x < width && y < height) return province_index_image[x + y * width];
+	return Province::NULL_INDEX;
+}
+
+Region* Map::get_region_by_identifier(std::string const& identifier) {
+	return regions.get_item_by_identifier(identifier);
+}
+
+Region const* Map::get_region_by_identifier(std::string const& identifier) const {
+	return regions.get_item_by_identifier(identifier);
+}
+
+static Province::colour_t colour_at(uint8_t const* colour_data, int32_t idx) {
+	return (colour_data[idx * 3] << 16) | (colour_data[idx * 3 + 1] << 8) | colour_data[idx * 3 + 2];
+}
+
+return_t Map::generate_province_index_image(size_t new_width, size_t new_height, uint8_t const* colour_data) {
+	if (!province_index_image.empty()) {
+		Logger::error("Province index image has already been generated!");
+		return FAILURE;
+	}
+	if (!provinces.is_locked()) {
+		Logger::error("Province index image cannot be generated until after provinces are locked!");
+		return FAILURE;
+	}
+	if (new_width < 1 || new_height < 1) {
+		Logger::error("Invalid province image dimensions: ", new_width, "x", new_height);
+		return FAILURE;
+	}
+	if (colour_data == nullptr) {
+		Logger::error("Province colour data pointer is null!");
+		return FAILURE;
+	}
+	width = new_width;
+	height = new_height;
+	province_index_image.resize(width * height);
+
+	std::vector<bool> province_checklist(provinces.get_item_count());
+	return_t ret = SUCCESS;
+	std::unordered_set<Province::colour_t> unrecognised_colours;
+
+	for (int32_t y = 0; y < height; ++y) {
+		for (int32_t x = 0; x < width; ++x) {
+			const int32_t idx = x + y * width;
+			const Province::colour_t colour = colour_at(colour_data, idx);
+			if (x > 0) {
+				const int32_t jdx = idx - 1;
+				if (colour_at(colour_data, jdx) == colour) {
+					province_index_image[idx] = province_index_image[jdx];
+					continue;
+				}
+			}
+			if (y > 0) {
+				const int32_t jdx = idx - width;
+				if (colour_at(colour_data, jdx) == colour) {
+					province_index_image[idx] = province_index_image[jdx];
+					continue;
+				}
+			}
+			Province const* province = get_province_by_colour(colour);
+			if (province != nullptr) {
+				const Province::index_t index = province->get_index();
+				province_index_image[idx] = index;
+				province_checklist[index - 1] = true;
+				continue;
+			}
+			if (unrecognised_colours.find(colour) == unrecognised_colours.end()) {
+				unrecognised_colours.insert(colour);
+				Logger::error("Unrecognised province colour ", Province::colour_to_hex_string(colour), " at (", x, ", ", y, ")");
+				ret = FAILURE;
+			}
+			province_index_image[idx] = Province::NULL_INDEX;
+		}
+	}
+
+	for (size_t idx = 0; idx < province_checklist.size(); ++idx) {
+		if (!province_checklist[idx]) {
+			Logger::error("Province missing from shape image: ", provinces.get_item_by_index(idx)->to_string());
+			ret = FAILURE;
+		}
+	}
+	return ret;
+}
+
+size_t Map::get_width() const {
+	return width;
+}
+
+size_t Map::get_height() const {
+	return height;
+}
+
+std::vector<Province::index_t> const& Map::get_province_index_image() const {
+	return province_index_image;
+}
+
+return_t Map::add_mapmode(std::string const& identifier, Mapmode::colour_func_t colour_func) {
+	if (identifier.empty()) {
+		Logger::error("Invalid mapmode identifier - empty!");
+		return FAILURE;
+	}
+	if (colour_func == nullptr) {
+		Logger::error("Mapmode colour function is null for identifier: ", identifier);
+		return FAILURE;
+	}
+	return mapmodes.add_item({ mapmodes.get_item_count(), identifier, colour_func });
+}
+
+void Map::lock_mapmodes() {
+	mapmodes.lock();
+}
+
+size_t Map::get_mapmode_count() const {
+	return mapmodes.get_item_count();
+}
+
+Mapmode const* Map::get_mapmode_by_index(size_t index) const {
+	return mapmodes.get_item_by_index(index);
+}
+
+Mapmode const* Map::get_mapmode_by_identifier(std::string const& identifier) const {
+	return mapmodes.get_item_by_identifier(identifier);
+}
+
+return_t Map::generate_mapmode_colours(Mapmode::index_t index, uint8_t* target) const {
+	if (target == nullptr) {
+		Logger::error("Mapmode colour target pointer is null!");
+		return FAILURE;
+	}
+	Mapmode const* mapmode = mapmodes.get_item_by_index(index);
+	if (mapmode == nullptr) {
+		Logger::error("Invalid mapmode index: ", index);
+		return FAILURE;
+	}
+	target += 4; // Skip past Province::NULL_INDEX
+	for (Province const& province : provinces.get_items()) {
+		const Province::colour_t colour = mapmode->get_colour(*this, province);
+		*target++ = (colour >> 16) & 0xFF;
+		*target++ = (colour >> 8) & 0xFF;
+		*target++ = colour & 0xFF;
+		*target++ = province.is_water() ? 0 : 255;
+	}
+	return SUCCESS;
+}
+
+return_t Map::generate_province_buildings(BuildingManager const& manager) {
+	return_t ret = SUCCESS;
+	for (Province& province : provinces.get_items())
+		if (manager.generate_province_buildings(province) != SUCCESS) ret = FAILURE;
+	return ret;
+}
+
+void Map::update_state(Date const& today) {
+	for (Province& province : provinces.get_items())
+		province.update_state(today);
+}
+
+void Map::tick(Date const& today) {
+	for (Province& province : provinces.get_items())
+		province.tick(today);
+}
diff --git a/extension/src/openvic2/map/Map.hpp b/extension/src/openvic2/map/Map.hpp
new file mode 100644
index 0000000..ebc23be
--- /dev/null
+++ b/extension/src/openvic2/map/Map.hpp
@@ -0,0 +1,76 @@
+#pragma once
+
+#include <functional>
+
+#include "openvic2/map/Region.hpp"
+
+namespace OpenVic2 {
+
+	struct Mapmode : HasIdentifier {
+		friend struct Map;
+
+		using colour_func_t = std::function<Province::colour_t (Map const&, Province const&)>;
+		using index_t = size_t;
+	private:
+		const index_t index;
+		const colour_func_t colour_func;
+
+		Mapmode(index_t new_index, std::string const& new_identifier, colour_func_t new_colour_func);
+	public:
+		index_t get_index() const;
+		Province::colour_t get_colour(Map const& map, Province const& province) const;
+	};
+
+	/* REQUIREMENTS:
+	 * MAP-4
+	 */
+	struct Map {
+	private:
+		IdentifierRegistry<Province> provinces;
+		IdentifierRegistry<Region> regions;
+		IdentifierRegistry<Mapmode> mapmodes;
+		bool water_provinces_locked = false;
+		size_t water_province_count = 0;
+
+		size_t width = 0, height = 0;
+		std::vector<Province::index_t> province_index_image;
+	public:
+		Map();
+
+		return_t add_province(std::string const& identifier, Province::colour_t colour);
+		void lock_provinces();
+		return_t set_water_province(std::string const& identifier);
+		void lock_water_provinces();
+		return_t add_region(std::string const& identifier, std::vector<std::string> const& province_identifiers);
+		void lock_regions();
+
+		size_t get_province_count() const;
+		Province* get_province_by_index(Province::index_t index);
+		Province const* get_province_by_index(Province::index_t index) const;
+		Province* get_province_by_identifier(std::string const& identifier);
+		Province const* get_province_by_identifier(std::string const& identifier) const;
+		Province* get_province_by_colour(Province::colour_t colour);
+		Province const* get_province_by_colour(Province::colour_t colour) const;
+		Province::index_t get_province_index_at(size_t x, size_t y) const;
+
+		Region* get_region_by_identifier(std::string const& identifier);
+		Region const* get_region_by_identifier(std::string const& identifier) const;
+
+		return_t generate_province_index_image(size_t new_width, size_t new_height, uint8_t const* colour_data);
+		size_t get_width() const;
+		size_t get_height() const;
+		std::vector<Province::index_t> const& get_province_index_image() const;
+
+		return_t add_mapmode(std::string const& identifier, Mapmode::colour_func_t colour_func);
+		void lock_mapmodes();
+		size_t get_mapmode_count() const;
+		Mapmode const* get_mapmode_by_index(Mapmode::index_t index) const;
+		Mapmode const* get_mapmode_by_identifier(std::string const& identifier) const;
+		return_t generate_mapmode_colours(Mapmode::index_t index, uint8_t* target) const;
+
+		return_t generate_province_buildings(BuildingManager const& manager);
+
+		void update_state(Date const& today);
+		void tick(Date const& today);
+	};
+}
diff --git a/extension/src/openvic2/map/Province.cpp b/extension/src/openvic2/map/Province.cpp
new file mode 100644
index 0000000..4360bce
--- /dev/null
+++ b/extension/src/openvic2/map/Province.cpp
@@ -0,0 +1,78 @@
+#include "openvic2/map/Province.hpp"
+
+#include <cassert>
+#include <sstream>
+#include <iomanip>
+
+using namespace OpenVic2;
+
+Province::Province(index_t new_index, std::string const& new_identifier, colour_t new_colour) :
+	HasIdentifier{ new_identifier }, index{ new_index }, colour{ new_colour }, buildings{ "buildings" } {
+	assert(index != NULL_INDEX);
+	assert(colour != NULL_COLOUR);
+}
+
+std::string Province::colour_to_hex_string(colour_t colour) {
+	std::ostringstream stream;
+	stream << std::hex << std::setfill('0') << std::setw(6) << colour;
+	return stream.str();
+}
+
+Province::index_t Province::get_index() const {
+	return index;
+}
+
+Province::colour_t Province::get_colour() const {
+	return colour;
+}
+
+Region* Province::get_region() const {
+	return region;
+}
+
+bool Province::is_water() const {
+	return water;
+}
+
+Province::life_rating_t Province::get_life_rating() const {
+	return life_rating;
+}
+
+return_t Province::add_building(BuildingType const& type) {
+	return buildings.add_item({ type });
+}
+
+void Province::lock_buildings() {
+	buildings.lock(false);
+}
+
+void Province::reset_buildings() {
+	buildings.reset();
+}
+
+std::vector<Building> const& Province::get_buildings() const {
+	return buildings.get_items();
+}
+
+return_t Province::expand_building(std::string const& building_type_identifier) {
+	Building* building = buildings.get_item_by_identifier(building_type_identifier);
+	if (building == nullptr) return FAILURE;
+	return building->expand();
+}
+
+std::string Province::to_string() const {
+	std::stringstream stream;
+	stream << "(#" << std::to_string(index) << ", " << get_identifier() << ", 0x" << colour_to_hex_string(colour) << ")";
+	return stream.str();
+}
+
+void Province::update_state(Date const& today) {
+	for (Building& building : buildings.get_items())
+		building.update_state(today);
+
+}
+
+void Province::tick(Date const& today) {
+	for (Building& building : buildings.get_items())
+		building.tick(today);
+}
diff --git a/extension/src/openvic2/map/Province.hpp b/extension/src/openvic2/map/Province.hpp
new file mode 100644
index 0000000..aa0329c
--- /dev/null
+++ b/extension/src/openvic2/map/Province.hpp
@@ -0,0 +1,50 @@
+#pragma once
+
+#include "openvic2/map/Building.hpp"
+
+namespace OpenVic2 {
+	struct Map;
+	struct Region;
+
+	/* REQUIREMENTS:
+	 * MAP-5, MAP-8, MAP-43, MAP-47
+	 */
+	struct Province : HasIdentifier {
+		friend struct Map;
+
+		using colour_t = uint32_t;
+		using index_t = uint16_t;
+		using life_rating_t = int8_t;
+
+		static constexpr colour_t NULL_COLOUR = 0, MAX_COLOUR = 0xFFFFFF;
+		static constexpr index_t NULL_INDEX = 0, MAX_INDEX = 0xFFFF;
+	private:
+		const index_t index;
+		const colour_t colour;
+		Region* region = nullptr;
+		bool water = false;
+		life_rating_t life_rating = 0;
+		IdentifierRegistry<Building> buildings;
+
+		Province(index_t new_index, std::string const& new_identifier, colour_t new_colour);
+	public:
+		static std::string colour_to_hex_string(colour_t colour);
+
+		Province(Province&&) = default;
+
+		index_t get_index() const;
+		colour_t get_colour() const;
+		Region* get_region() const;
+		bool is_water() const;
+		life_rating_t get_life_rating() const;
+		return_t add_building(BuildingType const& type);
+		void lock_buildings();
+		void reset_buildings();
+		std::vector<Building> const& get_buildings() const;
+		return_t expand_building(std::string const& building_type_identifier);
+		std::string to_string() const;
+
+		void update_state(Date const& today);
+		void tick(Date const& today);
+	};
+}
diff --git a/extension/src/openvic2/map/Region.cpp b/extension/src/openvic2/map/Region.cpp
new file mode 100644
index 0000000..3e5bee7
--- /dev/null
+++ b/extension/src/openvic2/map/Region.cpp
@@ -0,0 +1,26 @@
+#include "openvic2/map/Region.hpp"
+
+#include <cassert>
+#include <algorithm>
+
+using namespace OpenVic2;
+
+size_t ProvinceSet::get_province_count() const {
+	return provinces.size();
+}
+
+bool ProvinceSet::contains_province(Province const* province) const {
+	return province && std::find(provinces.begin(), provinces.end(), province) != provinces.end();
+}
+
+std::set<Province*> const& ProvinceSet::get_provinces() const {
+	return provinces;
+}
+
+Region::Region(std::string const& new_identifier) : HasIdentifier{ new_identifier } {}
+
+Province::colour_t Region::get_colour() const {
+	if (provinces.empty()) return 0xFF0000;
+	Province const* province = *provinces.cbegin();
+	return province->get_colour();
+}
diff --git a/extension/src/openvic2/map/Region.hpp b/extension/src/openvic2/map/Region.hpp
new file mode 100644
index 0000000..04564fc
--- /dev/null
+++ b/extension/src/openvic2/map/Region.hpp
@@ -0,0 +1,30 @@
+#pragma once
+
+#include <set>
+
+#include "openvic2/map/Province.hpp"
+
+namespace OpenVic2 {
+
+	struct ProvinceSet {
+	protected:
+		std::set<Province*> provinces;
+	public:
+		size_t get_province_count() const;
+		bool contains_province(Province const* province) const;
+		std::set<Province*> const& get_provinces() const;
+	};
+
+	/* REQUIREMENTS:
+	 * MAP-6, MAP-44, MAP-48
+	 */
+	struct Region : HasIdentifier, ProvinceSet {
+		friend struct Map;
+	private:
+		Region(std::string const& new_identifier);
+	public:
+		Region(Region&&) = default;
+
+		Province::colour_t get_colour() const;
+	};
+}