package game

import "core:math"
import "core:testing"

@(test)
test_distance :: proc(t: ^testing.T) {
	a := Vec2 {
		x = 3,
		y = 2,
	}
	b := Vec2 {
		x = 1,
		y = 2,
	}

	d := distance(a, b)

	testing.expect(t, math.abs(d - 2.0) < 0.0001)
}

@(test)
test_move_toward_already_close :: proc(t: ^testing.T) {
	pos := Vec2{0.5, 0}
	target := Vec2{0, 0}

	move_toward(&pos, target, 10, 1.0)

	testing.expect(t, math.abs(pos.x - 0.5) < 0.0001)
	testing.expect(t, math.abs(pos.y - 0.0) < 0.0001)
}

@(test)
test_move_toward_reaches_target :: proc(t: ^testing.T) {
	pos := Vec2{0, 0}
	target := Vec2{3, 4}

	move_toward(&pos, target, 100, 1.0)

	testing.expect(t, math.abs(pos.x - 3) < 0.0001)
	testing.expect(t, math.abs(pos.y - 4) < 0.0001)
}

@(test)
test_move_toward_partial :: proc(t: ^testing.T) {
	pos := Vec2{0, 0}
	target := Vec2{10, 0}

	move_toward(&pos, target, 2, 1.0)

	testing.expect(t, math.abs(pos.x - 2) < 0.0001)
	testing.expect(t, math.abs(pos.y) < 0.0001)
}

@(test)
test_move_toward_diagonal :: proc(t: ^testing.T) {
	pos := Vec2{0, 0}
	target := Vec2{3, 4}

	move_toward(&pos, target, 5, 0.5)
}