extends TestCase
## The pixel art of the things of later milestones in the showcase.


## The highest row of `image` with a pixel that is not transparent.
static func _top(image: Image) -> int:
	for y in image.get_height():
		for x in image.get_width():
			if image.get_pixel(x, y).a > 0.0:
				return y
	return image.get_height()


func test_a_plant_grows_taller_from_stage_to_stage() -> void:
	var style := WarmStyle.new()
	var tops: Array[int] = []
	for stage in PixelStyle.GROWTH_STAGES:
		tops.append(_top(style._plant_image(stage, 0).image))
	for stage in range(1, tops.size()):
		check(tops[stage] < tops[stage - 1], "stage %d is taller than stage %d: %s" % [stage, stage - 1, tops])


func test_grass_has_a_ragged_edge_only_toward_bare_ground() -> void:
	var style := WarmStyle.new()
	var inside := style._grass_image(255, 0).image
	var lone := style._grass_image(0, 0).image
	var tile := PixelStyle.TILE
	var inside_gaps := 0
	var lone_gaps := 0
	for y in tile:
		for x in tile:
			inside_gaps += 1 if inside.get_pixel(x, y).a == 0.0 else 0
			lone_gaps += 1 if lone.get_pixel(x, y).a == 0.0 else 0
	check_eq(inside_gaps, 0, "living all around: no gaps")
	check(lone_gaps > 4, "bare ground all around: a ragged, round edge (%d gaps)" % lone_gaps)
	check_eq(lone.get_pixel(0, 0).a, 0.0, "round at the corner")


func test_dead_soil_is_the_bare_earth_with_cracks() -> void:
	var style := WarmStyle.new()
	var earth := style._earth(0, 0).image
	var cracked := style._crack_soil(style._earth(0, 0), 0).image
	check(cracked.get_data() != earth.get_data(), "cracks in every other tile")
	check_eq(style._crack_soil(style._earth(1, 0), 1).image.get_data(), style._earth(1, 0).image.get_data(), "none in the others")


func test_an_animal_in_the_air_tucks_its_legs() -> void:
	var style := WarmStyle.new()
	var standing := style._grazer_image(false, false).image
	var tucked := style._grazer_image(true, false).image
	check(standing.get_pixel(5, 14).a > 0.0, "standing on its legs")
	check_eq(tucked.get_pixel(5, 14).a, 0.0, "legs tucked in the air")


func test_the_ruin_glows_in_its_doorway() -> void:
	var style := WarmStyle.new()
	var light := style._ruin_glow().image
	check(light.get_pixel(24, 31).a > 0.5, "bright in the middle of the doorway")
	check_eq(light.get_pixel(3, 30).a, 0.0, "dark on the walls")


func test_moss_keeps_its_outline_on_both_sides() -> void:
	var style := WarmStyle.new()
	for variant in 3:
		var image := style._moss_image(variant, 0).image
		for y in image.get_height():
			for x: int in [0, image.get_width() - 1]:
				var pixel := image.get_pixel(x, y)
				check(pixel.a == 0.0 or pixel == style.palette["outline"], "variant %d at %d, %d: %s" % [variant, x, y, pixel])