extends GutTest

const CYCLE := preload("res://world/jajce/day_night_cycle.gd")


func test_sun_is_highest_at_noon_and_lights_the_ground_throughout_day() -> void:
	var cycle := CYCLE.new()
	var light := DirectionalLight3D.new()
	cycle.directional_light = light
	cycle._apply_light_rotation(0.5)
	var noon_elevation := -light.rotation_degrees.x
	assert_gt(noon_elevation, 45.0, "Noon should have an elevated sun, not grazing light")
	for time in [0.15, 0.25, 0.4, 0.6, 0.75, 0.85]:
		cycle._apply_light_rotation(time)
		assert_lt(light.rotation_degrees.x, 0.0, "The daylight source points down toward terrain")
		assert_lt(-light.rotation_degrees.x, noon_elevation, "The solar arc peaks at noon")
	cycle.free()
	light.free()


func test_warm_transitions_overlap_dawn_and_dusk_without_persisting_at_noon() -> void:
	var cycle := CYCLE.new()
	for time in [0.22, 0.78]:
		assert_gt(cycle._day_factor(time), 0.0)
		assert_lt(cycle._day_factor(time), 1.0)
		assert_gt(cycle._sunrise_sunset_weight(time), 0.8)
	assert_eq(cycle._sunrise_sunset_weight(0.5), 0.0)
	assert_eq(cycle._sunrise_sunset_weight(0.0), 0.0)
	cycle.free()