#include "../binary-trees/binarytree.hpp"
#include <random>
#include "testutil.hpp"
#include <unordered_set>

unsigned static GetRandomNumber()
{
	static std::default_random_engine eng;
	static std::uniform_int_distribution<unsigned> valueDist(0u, 8096u);

	return valueDist(eng);
}

void FillWithRandomNumbers(BinaryTree::Tree<unsigned> & tree,
	std::unordered_set<unsigned> & control,
	unsigned const count = 512u)
{
	for(unsigned i = 0u; i < count; ++i)
	{
		unsigned const value = GetRandomNumber();
		control.insert(value);
		tree.Insert(value);
	}
}

bool TestInsertContains()
{
	std::unordered_set<unsigned> control;
	BinaryTree::Tree<unsigned> tree;

	FillWithRandomNumbers(tree, control);
	
	bool good = true;
	for(auto const & num : control)
	{
		if(!tree.Contains(num))
		{
			std::printf("Value %u inserted but cannot be found!\n", num);
			good = false;
		}
	}

	return good;
}

bool TestDeletion()
{
	std::unordered_set<unsigned> control;
	BinaryTree::Tree<unsigned> tree;

	FillWithRandomNumbers(tree, control);

	unsigned i = 0u;
	unsigned const toDeleteCount = control.size() / 4;
	while(i < toDeleteCount)
	{
		auto const toDelete = GetRandomNumber();
		auto iter = control.find(toDelete);
		if(iter != control.end())
		{
			control.erase(iter);
			tree.Delete(i);
			++i;
		}
	}
	
	bool good = true;
	for(auto const & num : control)
	{
		if(!tree.Contains(num))
		{
			std::printf("Value %u inserted but cannot be found!\n", num);
			good = false;
		}
	}

	return good;
}

int main()
{
	Test::Execute(TestInsertContains, "Insertion and find test");
	Test::Execute(TestDeletion, "Insertion and deletion test");

	return 0;
}