/*************************************************************************/
/*  test_oa_hash_map.cpp                                                 */
/*************************************************************************/
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/* Copyright (c) 2007-2020 Juan Linietsky, Ariel Manzur.                 */
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#include "test_oa_hash_map.h"

#include "core/oa_hash_map.h"
#include "core/os/os.h"

namespace TestOAHashMap {

struct CountedItem {
	static int count;

	int id = -1;
	bool destroyed = false;

	CountedItem() {
		count++;
	}

	CountedItem(int p_id) :
			id(p_id) {
		count++;
	}

	CountedItem(const CountedItem &p_other) :
			id(p_other.id) {
		count++;
	}

	CountedItem &operator=(const CountedItem &p_other) = default;

	~CountedItem() {
		CRASH_COND(destroyed);
		count--;
		destroyed = true;
	}
};

int CountedItem::count;

MainLoop *test() {
	OS::get_singleton()->print("\n\n\nHello from test\n");

	// test element tracking.
	{
		OAHashMap<int, int> map;

		map.set(42, 1337);
		map.set(1337, 21);
		map.set(42, 11880);

		int value = 0;
		map.lookup(42, value);

		OS::get_singleton()->print("capacity  %d\n", map.get_capacity());
		OS::get_singleton()->print("elements  %d\n", map.get_num_elements());

		OS::get_singleton()->print("map[42] = %d\n", value);
	}

	// rehashing and deletion
	{
		OAHashMap<int, int> map;

		for (int i = 0; i < 500; i++) {
			map.set(i, i * 2);
		}

		for (int i = 0; i < 500; i += 2) {
			map.remove(i);
		}

		uint32_t num_elems = 0;
		for (int i = 0; i < 500; i++) {
			int tmp;
			if (map.lookup(i, tmp) && tmp == i * 2) {
				num_elems++;
			}
		}

		OS::get_singleton()->print("elements %d == %d.\n", map.get_num_elements(), num_elems);
	}

	// iteration
	{
		OAHashMap<String, int> map;

		map.set("Hello", 1);
		map.set("World", 2);
		map.set("Godot rocks", 42);

		for (OAHashMap<String, int>::Iterator it = map.iter(); it.valid; it = map.next_iter(it)) {
			OS::get_singleton()->print("map[\"%s\"] = %d\n", it.key->utf8().get_data(), *it.value);
		}
	}

	// stress test / test for issue #22928
	{
		OAHashMap<int, int> map;
		int dummy = 0;
		const int N = 1000;
		uint32_t *keys = new uint32_t[N];

		Math::seed(0);

		// insert a couple of random keys (with a dummy value, which is ignored)
		for (int i = 0; i < N; i++) {
			keys[i] = Math::rand();
			map.set(keys[i], dummy);

			if (!map.lookup(keys[i], dummy)) {
				OS::get_singleton()->print("could not find 0x%X despite it was just inserted!\n", unsigned(keys[i]));
			}
		}

		// check whether the keys are still present
		for (int i = 0; i < N; i++) {
			if (!map.lookup(keys[i], dummy)) {
				OS::get_singleton()->print("could not find 0x%X despite it has been inserted previously! (not checking the other keys, breaking...)\n", unsigned(keys[i]));
				break;
			}
		}

		delete[] keys;
	}

	// regression test / test for issue related to #31402
	{
		OS::get_singleton()->print("test for issue #31402 started...\n");

		const int num_test_values = 12;
		int test_values[num_test_values] = { 0, 24, 48, 72, 96, 120, 144, 168, 192, 216, 240, 264 };

		int dummy = 0;
		OAHashMap<int, int> map;
		map.clear();

		for (int i = 0; i < num_test_values; ++i) {
			map.set(test_values[i], dummy);
		}

		OS::get_singleton()->print("test for issue #31402 passed.\n");
	}

	// test collision resolution, should not crash or run indefinitely
	{
		OAHashMap<int, int> map(4);
		map.set(1, 1);
		map.set(5, 1);
		map.set(9, 1);
		map.set(13, 1);
		map.remove(5);
		map.remove(9);
		map.remove(13);
		map.set(5, 1);
	}

	// test memory management of items, should not crash or leak items
	{
		// Exercise different patterns of removal
		for (int i = 0; i < 4; ++i) {
			{
				OAHashMap<String, CountedItem> map;
				int id = 0;
				for (int j = 0; j < 100; ++j) {
					map.insert(itos(j), CountedItem(id));
				}
				if (i <= 1) {
					for (int j = 0; j < 100; ++j) {
						map.remove(itos(j));
					}
				}
				if (i % 2 == 0) {
					map.clear();
				}
			}

			if (CountedItem::count != 0) {
				OS::get_singleton()->print("%d != 0 (not performing the other test sub-cases, breaking...)\n", CountedItem::count);
				break;
			}
		}
	}

	return nullptr;
}

} // namespace TestOAHashMap