3 files changed, 92 insertions, 7 deletions

diff --git a/src/openvic-simulation/map/Map.cpp b/src/openvic-simulation/map/Map.cpp
index 0173ab6..3b06c66 100644
--- a/src/openvic-simulation/map/Map.cpp
+++ b/src/openvic-simulation/map/Map.cpp
@@ -501,11 +501,35 @@ bool Map::load_region_file(ast::NodeCPtr root) {
 }
 
 bool Map::_generate_province_adjacencies() {
-	/* TODO - generate default province adjacencies
-	 * variables available for use:
-	 * - width, height
-	 * - province_shape_image, so the index at (x,y) is:
-	 *   province_shape_image[x + y * width].index
-	 */
-	return true;
+	bool changed = false;
+
+	auto generate_adjacency = [&] (shape_pixel_t cur_pixel, size_t x, size_t y) -> bool {
+		size_t idx = x + y * width;
+		shape_pixel_t neighbour_pixel = province_shape_image[idx];
+		if (cur_pixel.index != neighbour_pixel.index) {
+			Province* cur = get_province_by_index(cur_pixel.index);
+			Province* neighbour = get_province_by_index(neighbour_pixel.index);
+			if(cur != nullptr && neighbour != nullptr) {
+				cur->add_adjacency(neighbour, 0, 0);
+				neighbour->add_adjacency(cur, 0, 0);
+				return true;
+			} else Logger::error(
+				"Couldn't find province(s): current = ", cur, " (", cur_pixel.index,
+				"), neighbour = ", neighbour, " (", neighbour_pixel.index, ")"
+			);
+		}
+		return false;
+	};
+	
+	for (size_t y = 0; y < height; ++y) {
+		for (size_t x = 0; x < width; ++x) {
+			shape_pixel_t cur = province_shape_image[x + y * width];
+			if(x + 1 < width)
+				changed |= generate_adjacency(cur, x + 1, y);
+			if(y + 1 < height)
+				changed |= generate_adjacency(cur, x, y + 1);
+		}
+	}
+
+	return changed;
 }
diff --git a/src/openvic-simulation/map/Province.cpp b/src/openvic-simulation/map/Province.cpp
index 775c0a4..db7e784 100644
--- a/src/openvic-simulation/map/Province.cpp
+++ b/src/openvic-simulation/map/Province.cpp
@@ -1,7 +1,9 @@
 #include "Province.hpp"
 
 #include <cassert>
+#include <cstddef>
 #include <iomanip>
+#include <iterator>
 #include <sstream>
 
 using namespace OpenVic;
@@ -137,3 +139,39 @@ void Province::tick(Date const& today) {
 	for (Building& building : buildings.get_items())
 		building.tick(today);
 }
+
+Province::adjacency_t::adjacency_t(Province const* province, distance_t distance, flags_t flags) 
+	: province { province }, distance { distance }, flags { flags } {
+	assert(province != nullptr);
+}
+
+Province::distance_t Province::adjacency_t::get_distance() const {
+	return distance;
+}
+
+Province::flags_t Province::adjacency_t::get_flags() {
+	return flags;
+}
+
+bool Province::is_adjacent_to(Province const* province) {
+	for (adjacency_t adj : adjacencies)
+		if (adj.province == province)
+			return true;
+	return false;
+}
+
+bool Province::add_adjacency(Province const* province, distance_t distance, flags_t flags) {
+	if (province == nullptr) {
+		Logger::error("Tried to create null adjacency province for province ", get_identifier(), "!");
+		return false;
+	}
+
+	if (is_adjacent_to(province))
+		return false;
+	adjacencies.push_back({ province, distance, flags });
+	return true;
+}
+
+std::vector<Province::adjacency_t> const& Province::get_adjacencies() const {
+	return adjacencies;
+}
\ No newline at end of file
diff --git a/src/openvic-simulation/map/Province.hpp b/src/openvic-simulation/map/Province.hpp
index bf407ae..370d05c 100644
--- a/src/openvic-simulation/map/Province.hpp
+++ b/src/openvic-simulation/map/Province.hpp
@@ -17,6 +17,23 @@ namespace OpenVic {
 
 		using index_t = uint16_t;
 		using life_rating_t = int8_t;
+		using distance_t = uint16_t;
+		using flags_t = uint16_t; 
+
+		struct adjacency_t {
+			friend struct Province;
+
+		private:
+			Province const* const province;
+			const distance_t distance;
+			flags_t flags;
+
+			adjacency_t(Province const* province, distance_t distance, flags_t flags);
+
+		public:
+			distance_t get_distance() const;
+			flags_t get_flags();
+		};
 
 		static constexpr index_t NULL_INDEX = 0, MAX_INDEX = (1 << (8 * sizeof(index_t))) - 1;
 
@@ -33,6 +50,8 @@ namespace OpenVic {
 		Pop::pop_size_t total_population;
 		distribution_t pop_types, cultures, religions;
 
+		std::vector<adjacency_t> adjacencies;
+
 		Province(const std::string_view new_identifier, colour_t new_colour, index_t new_index);
 
 	public:
@@ -65,5 +84,9 @@ namespace OpenVic {
 
 		void update_state(Date const& today);
 		void tick(Date const& today);
+
+		bool is_adjacent_to(Province const* province);
+		bool add_adjacency(Province const* province, distance_t distance, flags_t flags);
+		std::vector<adjacency_t> const& get_adjacencies() const;
 	};
 }