class_name Blocks
extends Node2D
## The core plus rings of rotating blocks around it, generated from the level number.

const SEGMENTS_PER_RING := 10
const MAX_RING_SPEED := 30.0 # degrees per second

var core: Core
var _rings: Array[Node2D] = []
var _speeds: Array[float] = []


func build(level: int) -> void:
	var layout := _layout(level)
	for index in range(layout.rings - 1, -1, -1):
		_add_ring(layout.size, index, layout.indestructible_chance)
	core = Core.new()
	add_child(core)


func _physics_process(delta: float) -> void:
	for i in _rings.size():
		_rings[i].rotation_degrees += _speeds[i] * delta


## Ring count, ring thickness and indestructible-block chance for a level. Each level adds
## a ring or raises the chance; once there are too many rings they restart thinner.
## Ported as-is from BlocksLayer::setLevel.
static func _layout(level: int) -> Dictionary:
	var count := 0
	var delta := 15
	var size := Params.CORE_RADIUS * 0.75
	var rings := 1
	var chance := 0.0
	var i := 0
	while count <= level:
		var j := 0
		while count <= level and j <= i:
			if i + 1 > delta:
				delta = int(delta * 1.5)
				size /= 1.5
				i = 0
			rings = i + 1
			chance = j * 0.05 / delta * 8.0
			count += 1
			j += 1
		i += 1
	return { rings = rings, size = size, indestructible_chance = chance }


func _add_ring(size: float, index: int, indestructible_chance: float) -> void:
	var inner := index * size + Params.CORE_RADIUS
	var outer := (index + 1) * size + Params.CORE_RADIUS

	# Evenly spaced segment boundaries, each jittered so segments have uneven lengths.
	var step := TAU / SEGMENTS_PER_RING
	var bounds: Array[float] = []
	for i in SEGMENTS_PER_RING:
		bounds.append(step * i + randf_range(-1.0, 1.0) * 0.45 * step)
	bounds.append(bounds[0] + TAU)

	var ring := Node2D.new()
	for i in SEGMENTS_PER_RING:
		var indestructible := indestructible_chance >= randf()
		ring.add_child(Block.new(inner, outer, bounds[i], bounds[i + 1], indestructible))
	add_child(ring)
	_rings.append(ring)
	_speeds.append(randf_range(-MAX_RING_SPEED, MAX_RING_SPEED))