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/*  test_hash_set.h                                                       */
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#ifndef TEST_HASH_SET_H
#define TEST_HASH_SET_H

#include "core/templates/hash_set.h"

#include "tests/test_macros.h"

namespace TestHashSet {

TEST_CASE("[HashSet] Insert element") {
	HashSet<int> set;
	HashSet<int>::Iterator e = set.insert(42);

	CHECK(e);
	CHECK(*e == 42);
	CHECK(set.has(42));
	CHECK(set.find(42));
	set.reset();
}

TEST_CASE("[HashSet] Insert existing element") {
	HashSet<int> set;
	set.insert(42);
	set.insert(42);

	CHECK(set.has(42));
	CHECK(set.size() == 1);
}

TEST_CASE("[HashSet] Insert, iterate and remove many elements") {
	const int elem_max = 12343;
	HashSet<int> set;
	for (int i = 0; i < elem_max; i++) {
		set.insert(i);
	}

	//insert order should have been kept
	int idx = 0;
	for (const int &K : set) {
		CHECK(idx == K);
		CHECK(set.has(idx));
		idx++;
	}

	Vector<int> elems_still_valid;

	for (int i = 0; i < elem_max; i++) {
		if ((i % 5) == 0) {
			set.erase(i);
		} else {
			elems_still_valid.push_back(i);
		}
	}

	CHECK(elems_still_valid.size() == set.size());

	for (int i = 0; i < elems_still_valid.size(); i++) {
		CHECK(set.has(elems_still_valid[i]));
	}
}

TEST_CASE("[HashSet] Insert, iterate and remove many strings") {
	// This tests a key that uses allocation, to see if any leaks occur

	uint64_t pre_mem = Memory::get_mem_usage();
	const int elem_max = 4018;
	HashSet<String> set;
	for (int i = 0; i < elem_max; i++) {
		set.insert(itos(i));
	}

	//insert order should have been kept
	int idx = 0;
	for (const String &K : set) {
		CHECK(itos(idx) == K);
		CHECK(set.has(itos(idx)));
		idx++;
	}

	Vector<String> elems_still_valid;

	for (int i = 0; i < elem_max; i++) {
		if ((i % 5) == 0) {
			set.erase(itos(i));
		} else {
			elems_still_valid.push_back(itos(i));
		}
	}

	CHECK(elems_still_valid.size() == set.size());

	for (int i = 0; i < elems_still_valid.size(); i++) {
		CHECK(set.has(elems_still_valid[i]));
	}

	elems_still_valid.clear();
	set.reset();

	CHECK(Memory::get_mem_usage() == pre_mem);
}

TEST_CASE("[HashSet] Erase via element") {
	HashSet<int> set;
	HashSet<int>::Iterator e = set.insert(42);
	set.remove(e);
	CHECK(!set.has(42));
	CHECK(!set.find(42));
}

TEST_CASE("[HashSet] Erase via key") {
	HashSet<int> set;
	set.insert(42);
	set.insert(49);
	set.erase(42);
	CHECK(!set.has(42));
	CHECK(!set.find(42));
}

TEST_CASE("[HashSet] Insert and erase half elements") {
	HashSet<int> set;
	set.insert(1);
	set.insert(2);
	set.insert(3);
	set.insert(4);
	set.erase(1);
	set.erase(3);

	CHECK(set.size() == 2);
	CHECK(set.has(2));
	CHECK(set.has(4));
}

TEST_CASE("[HashSet] Size") {
	HashSet<int> set;
	set.insert(42);
	set.insert(123);
	set.insert(123);
	set.insert(0);
	set.insert(123485);

	CHECK(set.size() == 4);
}

TEST_CASE("[HashSet] Iteration") {
	HashSet<int> set;
	set.insert(42);
	set.insert(123);
	set.insert(0);
	set.insert(123485);

	Vector<int> expected;
	expected.push_back(42);
	expected.push_back(123);
	expected.push_back(0);
	expected.push_back(123485);

	int idx = 0;
	for (const int &E : set) {
		CHECK(expected[idx] == E);
		++idx;
	}
}

TEST_CASE("[HashSet] Copy") {
	HashSet<int> set;
	set.insert(42);
	set.insert(123);
	set.insert(0);
	set.insert(123485);

	Vector<int> expected;
	expected.push_back(42);
	expected.push_back(123);
	expected.push_back(0);
	expected.push_back(123485);

	HashSet<int> copy_assign = set;

	int idx = 0;
	for (const int &E : copy_assign) {
		CHECK(expected[idx] == E);
		++idx;
	}

	HashSet<int> copy_construct(set);

	idx = 0;
	for (const int &E : copy_construct) {
		CHECK(expected[idx] == E);
		++idx;
	}
}

} // namespace TestHashSet

#endif // TEST_HASH_SET_H