#include <gtest/gtest.h>

#include "missiles.h"

using namespace devilution;

TEST(Missiles, GetDirection8)
{
	EXPECT_EQ(0, GetDirection({ 0, 0 }, { 15, 15 }));
	EXPECT_EQ(1, GetDirection({ 0, 0 }, { 0, 15 }));
	EXPECT_EQ(0, GetDirection({ 0, 0 }, { 8, 15 }));
	EXPECT_EQ(0, GetDirection({ 0, 0 }, { 8, 8 }));
	EXPECT_EQ(0, GetDirection({ 0, 0 }, { 15, 8 }));
	EXPECT_EQ(0, GetDirection({ 0, 0 }, { 15, 7 }));
	EXPECT_EQ(0, GetDirection({ 0, 0 }, { 11, 7 }));
	EXPECT_EQ(0, GetDirection({ 0, 0 }, { 8, 11 }));
	EXPECT_EQ(4, GetDirection({ 15, 15 }, { 0, 0 }));
	EXPECT_EQ(5, GetDirection({ 0, 15 }, { 0, 0 }));
	EXPECT_EQ(4, GetDirection({ 8, 15 }, { 0, 0 }));
	EXPECT_EQ(4, GetDirection({ 8, 8 }, { 0, 0 }));
	EXPECT_EQ(4, GetDirection({ 15, 8 }, { 0, 0 }));
	EXPECT_EQ(4, GetDirection({ 15, 7 }, { 0, 0 }));
	EXPECT_EQ(4, GetDirection({ 11, 7 }, { 0, 0 }));
	EXPECT_EQ(4, GetDirection({ 8, 11 }, { 0, 0 }));
	EXPECT_EQ(6, GetDirection({ 0, 15 }, { 15, 0 }));
	EXPECT_EQ(7, GetDirection({ 0, 0 }, { 15, 0 }));
	EXPECT_EQ(6, GetDirection({ 0, 8 }, { 15, 0 }));
	EXPECT_EQ(6, GetDirection({ 0, 8 }, { 8, 0 }));
	EXPECT_EQ(6, GetDirection({ 0, 15 }, { 8, 0 }));
	EXPECT_EQ(6, GetDirection({ 0, 15 }, { 7, 0 }));
	EXPECT_EQ(6, GetDirection({ 0, 11 }, { 7, 0 }));
	EXPECT_EQ(6, GetDirection({ 0, 8 }, { 11, 0 }));

	EXPECT_EQ(0, GetDirection({ 1, 1 }, { 2, 2 }));
	EXPECT_EQ(1, GetDirection({ 1, 1 }, { 1, 2 }));
	EXPECT_EQ(2, GetDirection({ 1, 1 }, { 0, 2 }));
	EXPECT_EQ(3, GetDirection({ 1, 1 }, { 0, 1 }));
	EXPECT_EQ(4, GetDirection({ 1, 1 }, { 0, 0 }));
	EXPECT_EQ(5, GetDirection({ 1, 1 }, { 1, 0 }));
	EXPECT_EQ(6, GetDirection({ 1, 1 }, { 2, 0 }));
	EXPECT_EQ(7, GetDirection({ 1, 1 }, { 2, 1 }));
}

TEST(Missiles, GetDirection16)
{
	EXPECT_EQ(0, GetDirection16(0, 0, 15, 15));
	EXPECT_EQ(2, GetDirection16(0, 0, 0, 15));
	EXPECT_EQ(1, GetDirection16(0, 0, 8, 15));
	EXPECT_EQ(0, GetDirection16(0, 0, 8, 8));
	EXPECT_EQ(15, GetDirection16(0, 0, 15, 8));
	EXPECT_EQ(15, GetDirection16(0, 0, 15, 7));
	EXPECT_EQ(15, GetDirection16(0, 0, 11, 7));
	EXPECT_EQ(0, GetDirection16(0, 0, 8, 11));
	EXPECT_EQ(8, GetDirection16(15, 15, 0, 0));
	EXPECT_EQ(10, GetDirection16(0, 15, 0, 0));
	EXPECT_EQ(9, GetDirection16(8, 15, 0, 0));
	EXPECT_EQ(8, GetDirection16(8, 8, 0, 0));
	EXPECT_EQ(7, GetDirection16(15, 8, 0, 0));
	EXPECT_EQ(7, GetDirection16(15, 7, 0, 0));
	EXPECT_EQ(7, GetDirection16(11, 7, 0, 0));
	EXPECT_EQ(8, GetDirection16(8, 11, 0, 0));
	EXPECT_EQ(12, GetDirection16(0, 15, 15, 0));
	EXPECT_EQ(14, GetDirection16(0, 0, 15, 0));
	EXPECT_EQ(13, GetDirection16(0, 8, 15, 0));
	EXPECT_EQ(12, GetDirection16(0, 8, 8, 0));
	EXPECT_EQ(11, GetDirection16(0, 15, 8, 0));
	EXPECT_EQ(11, GetDirection16(0, 15, 7, 0));
	EXPECT_EQ(11, GetDirection16(0, 11, 7, 0));
	EXPECT_EQ(12, GetDirection16(0, 8, 11, 0));

	EXPECT_EQ(0, GetDirection16(2, 2, 3, 3));
	EXPECT_EQ(1, GetDirection16(2, 2, 3, 4));
	EXPECT_EQ(2, GetDirection16(2, 2, 2, 4));
	EXPECT_EQ(3, GetDirection16(2, 2, 1, 4));
	EXPECT_EQ(4, GetDirection16(2, 2, 1, 3));
	EXPECT_EQ(5, GetDirection16(2, 2, 0, 3));
	EXPECT_EQ(6, GetDirection16(2, 2, 0, 2));
	EXPECT_EQ(7, GetDirection16(2, 2, 0, 1));
	EXPECT_EQ(8, GetDirection16(2, 2, 1, 1));
	EXPECT_EQ(9, GetDirection16(2, 2, 1, 0));
	EXPECT_EQ(10, GetDirection16(2, 2, 2, 0));
	EXPECT_EQ(11, GetDirection16(2, 2, 3, 0));
	EXPECT_EQ(12, GetDirection16(2, 2, 3, 1));
	EXPECT_EQ(13, GetDirection16(2, 2, 4, 1));
	EXPECT_EQ(14, GetDirection16(2, 2, 4, 2));
	EXPECT_EQ(15, GetDirection16(2, 2, 4, 3));
}