#include "GameInstance.h"

#include <filesystem>
#include <fstream>
#include <chrono>
#include <thread>

#include "Core/CoreInstance.h"
#include "Game/WorldFactory.h"
#include "SaveMap/SaveMap.h"
#include "Game/World/World.h"

extern std::vector<WorldFactory> world_factories;

GameInstance::GameInstance(CoreInstance& core) : core(core)
{
	const std::string& base_world = core.getBaseWorldName();
	
	// Init directories
	std::filesystem::create_directories(std::filesystem::path("./Resources"));
	
	std::ifstream file("./Worlds/" + base_world + ".world");
	if (file.fail())
		throw std::runtime_error("Can't open world file");
	
	std::string data;
	std::getline(file, data);
	
	for (auto& factories : world_factories)
	{
		if (factories.world_name == base_world)
		{
			world = factories.factory(*this);
			break;
		}
	}
	
	if (world == nullptr)
		throw std::runtime_error("Can't find world");
	
	world->load(std::make_shared<SaveMap>(data));
}

GameInstance::~GameInstance()
{
	delete world;
}

void GameInstance::start()
{
	world->BeginPlay();

	auto first = std::chrono::steady_clock::now();

    
	while (is_running)
	{
		auto second = std::chrono::steady_clock::now();
		std::chrono::milliseconds delta_time = std::chrono::duration_cast<std::chrono::milliseconds>(second - first);
		world->Tick(delta_time.count() / 1000.0);
		first = second;
		std::this_thread::sleep_for(std::chrono::milliseconds(10));
	}
}

void GameInstance::stop()
{
	is_running = false;
}

void GameInstance::quit()
{
	stop();
	core.quit();
}