import math
import math.vec

fn test_vec2_int() {
	mut v1 := vec.vec2(0, 0)
	mut v2 := vec.vec2(0, 0)
	assert v1 == v2
	v1.one()
	v2.one()
	assert v1.x == 1
	assert v1.y == 1
	assert v1 == v2

	v3 := v1 + v2
	assert typeof(v3).name == 'vec.Vec2[int]'
	assert v3.x == 2
	assert v3.y == 2
}

fn test_vec2_f32() {
	mut v1 := vec.vec2(f32(0), 0)
	mut v2 := vec.vec2(f32(0), 0)
	assert v1 == v2
	v1.one()
	v2.one()
	assert v1.x == 1
	assert v1.y == 1
	assert v1 == v2

	v3 := v1 + v2
	assert typeof(v3).name == 'vec.Vec2[f32]'
	assert v3.x == 2
	assert v3.y == 2
}

fn test_vec2_f64() {
	mut v1 := vec.vec2(0.0, 0)
	mut v2 := vec.vec2(0.0, 0)
	assert v1 == v2
	v1.one()
	v2.one()
	assert v1.x == 1
	assert v1.y == 1
	assert v1 == v2

	v3 := v1 + v2
	assert typeof(v3).name == 'vec.Vec2[f64]'
	assert v3.x == 2
	assert v3.y == 2
}

fn test_vec2_f64_utils_1() {
	mut v1 := vec.vec2(2.0, 3.0)
	mut v2 := vec.vec2(1.0, 4.0)

	mut zv := vec.vec2(5.0, 5.0)
	zv.zero()

	v3 := v1 + v2
	assert v3.x == 3
	assert v3.y == 7

	assert v1.dot(v2) == 14
	assert v1.cross(v2) == 5

	v1l := vec.vec2(40.0, 9.0)
	assert v1l.magnitude() == 41

	mut ctv1 := vec.vec2(0.000001, 0.000001)
	ctv1.clean_tolerance(0.00001)
	assert ctv1 == zv
}

fn test_vec2_f64_utils_2() {
	mut v1 := vec.vec2(4.0, 4.0)
	assert math.veryclose(v1.unit().magnitude(), 1)
	v2 := v1.mul_scalar(0.5)
	assert v2.x == 2
	assert v2.y == 2
	assert math.veryclose(v2.unit().magnitude(), 1)

	invv2 := v2.inv()
	assert invv2.x == 0.5
	assert invv2.y == 0.5
}

fn test_vec2_angle_between() {
	assert vec.vec2(1.0, 0.0).angle_between(vec.vec2(1.0, 1.0)) == math.pi * 1.0 / 4.0
	assert vec.vec2(1.0, 0.0).angle_between(vec.vec2(0.0, 1.0)) == math.pi * 2.0 / 4.0
	assert vec.vec2(1.0, 0.0).angle_between(vec.vec2(-1.0, 1.0)) == math.pi * 3.0 / 4.0
	assert vec.vec2(1.0, 0.0).angle_between(vec.vec2(-1.0, 0.0)) == math.pi
	assert vec.vec2(1.0, 0.0).angle_between(vec.vec2(-1.0, -1.0)) == math.pi * 5.0 / 4.0 - 2 * math.pi
	assert vec.vec2(1.0, 0.0).angle_between(vec.vec2(0.0, -1.0)) == math.pi * 6.0 / 4.0 - 2 * math.pi
	assert vec.vec2(1.0, 0.0).angle_between(vec.vec2(1.0, -1.0)) == math.pi * 7.0 / 4.0 - 2 * math.pi

	// check the angle between non-normalised vectors too:
	assert vec.vec2(5.0, 0.0).angle_between(vec.vec2(2.0, 2.0)) == math.pi * 1.0 / 4.0
	assert vec.vec2(5.0, 0.0).angle_between(vec.vec2(0.0, 2.0)) == math.pi * 2.0 / 4.0
	assert vec.vec2(5.0, 0.0).angle_between(vec.vec2(-2.0, 2.0)) == math.pi * 3.0 / 4.0
	assert vec.vec2(5.0, 0.0).angle_between(vec.vec2(-2.0, 0.0)) == math.pi
	assert vec.vec2(5.0, 0.0).angle_between(vec.vec2(-2.0, -2.0)) == math.pi * 5.0 / 4.0 - 2 * math.pi
	assert vec.vec2(5.0, 0.0).angle_between(vec.vec2(0.0, -2.0)) == math.pi * 6.0 / 4.0 - 2 * math.pi
	assert vec.vec2(5.0, 0.0).angle_between(vec.vec2(2.0, -2.0)) == math.pi * 7.0 / 4.0 - 2 * math.pi
}