extends SceneTree
## Seeds the placeholder effect .tscn (and the gallery scene) once, headless. Those .tscn are the
## source of truth Siim edits in the inspector — this script only builds their first-draft defaults
## (ported from the old code-built particles). Re-run only to reset a placeholder from scratch:
##   godot --headless --script fx/_seed_placeholders.gd

const _EFFECT_SCRIPT := "res://fx/one_shot_effect.gd"
const _GALLERY_SCRIPT := "res://fx/effect_gallery.gd"


func _init() -> void:
	_seed_blood_burst()
	_seed_slam_dust()
	_seed_spark()
	_seed_hit_flash()
	_seed_gallery()
	print("Seeded FX placeholder scenes into res://fx/")
	quit()


# ── shared builders ─────────────────────────────────────────────────────────
func _unshaded() -> StandardMaterial3D:
	var m := StandardMaterial3D.new()
	m.shading_mode = BaseMaterial3D.SHADING_MODE_UNSHADED
	m.transparency = BaseMaterial3D.TRANSPARENCY_ALPHA
	m.vertex_color_use_as_albedo = true
	m.cull_mode = BaseMaterial3D.CULL_DISABLED
	return m


func _sphere(radius: float) -> SphereMesh:
	var s := SphereMesh.new()
	s.radius = radius
	s.height = radius * 2.0
	s.radial_segments = 4
	s.rings = 2
	s.material = _unshaded()
	return s


func _ramp(c0: Color, c1: Color) -> Gradient:
	var g := Gradient.new()
	g.set_color(0, c0)
	g.set_color(1, c1)
	return g


func _curve(points: Array) -> Curve:
	var c := Curve.new()
	for pt: Vector2 in points:
		c.add_point(pt)
	return c


func _save(p: CPUParticles3D, path: String) -> void:
	p.set_script(load(_EFFECT_SCRIPT))
	var packed := PackedScene.new()
	packed.pack(p)
	ResourceSaver.save(packed, path)
	p.free()


# ── the placeholders (defaults ported from the old code-built particles) ─────
func _seed_blood_burst() -> void:
	var p := CPUParticles3D.new()
	p.name = "blood_burst"
	p.mesh = _sphere(0.07)
	p.color_ramp = _ramp(Color(1.0, 0.02, 0.02, 1.0), Color(0.25, 0.0, 0.0, 0.0))
	p.scale_amount_curve = _curve([Vector2(0.0, 1.0), Vector2(0.6, 0.5), Vector2(1.0, 0.0)])
	p.emitting = false
	p.one_shot = true
	p.explosiveness = 0.9
	p.amount = 25
	p.lifetime = 1.1
	p.randomness = 0.4
	p.local_coords = false
	p.direction = Vector3(0.0, 1.0, 0.0)
	p.spread = 80.0
	p.gravity = Vector3(0.0, -7.0, 0.0)
	p.initial_velocity_min = 4.0
	p.initial_velocity_max = 11.0
	p.scale_amount_min = 0.5
	p.scale_amount_max = 1.6
	_save(p, "res://fx/blood_burst.tscn")


func _seed_slam_dust() -> void:
	var p := CPUParticles3D.new()
	p.name = "slam_dust"
	p.mesh = _sphere(0.16)
	p.color_ramp = _ramp(Color(0.72, 0.60, 0.40, 0.9), Color(0.55, 0.45, 0.30, 0.0))
	p.scale_amount_curve = _curve([Vector2(0.0, 0.4), Vector2(0.35, 1.0), Vector2(1.0, 0.0)])
	p.emitting = false
	p.one_shot = true
	p.explosiveness = 1.0
	p.amount = 36
	p.lifetime = 0.9
	p.randomness = 0.5
	p.local_coords = false
	p.emission_shape = CPUParticles3D.EMISSION_SHAPE_SPHERE
	p.emission_sphere_radius = 0.5
	p.direction = Vector3(0.0, 1.0, 0.0)
	p.spread = 75.0
	p.gravity = Vector3(0.0, -6.0, 0.0)
	p.initial_velocity_min = 2.5
	p.initial_velocity_max = 6.5
	p.scale_amount_min = 0.6
	p.scale_amount_max = 1.4
	_save(p, "res://fx/slam_dust.tscn")


func _seed_spark() -> void:
	var p := CPUParticles3D.new()
	p.name = "spark"
	p.mesh = _sphere(0.03)
	p.color_ramp = _ramp(Color(1.0, 0.95, 0.6, 1.0), Color(1.0, 0.55, 0.1, 0.0))
	p.scale_amount_curve = _curve([Vector2(0.0, 1.0), Vector2(1.0, 0.0)])
	p.emitting = false
	p.one_shot = true
	p.explosiveness = 1.0
	p.amount = 14
	p.lifetime = 0.35
	p.randomness = 0.6
	p.local_coords = false
	p.direction = Vector3(0.0, 1.0, 0.0)
	p.spread = 45.0
	p.gravity = Vector3(0.0, -9.0, 0.0)
	p.initial_velocity_min = 3.0
	p.initial_velocity_max = 7.0
	p.scale_amount_min = 0.4
	p.scale_amount_max = 1.0
	_save(p, "res://fx/spark.tscn")


func _seed_hit_flash() -> void:
	var p := CPUParticles3D.new()
	p.name = "hit_flash"
	p.mesh = _sphere(0.05)
	p.color_ramp = _ramp(Color(1.0, 1.0, 1.0, 1.0), Color(1.0, 1.0, 1.0, 0.0))
	p.scale_amount_curve = _curve([Vector2(0.0, 0.2), Vector2(0.3, 1.2), Vector2(1.0, 0.0)])
	p.emitting = false
	p.one_shot = true
	p.explosiveness = 1.0
	p.amount = 6
	p.lifetime = 0.18
	p.randomness = 0.2
	p.local_coords = false
	p.spread = 180.0
	p.gravity = Vector3.ZERO
	p.initial_velocity_min = 0.5
	p.initial_velocity_max = 1.5
	p.scale_amount_min = 0.8
	p.scale_amount_max = 1.4
	_save(p, "res://fx/hit_flash.tscn")


func _seed_gallery() -> void:
	var root_node := Node3D.new()
	root_node.name = "EffectGallery"

	var cam := Camera3D.new()
	cam.name = "Camera3D"
	cam.transform = Transform3D(Basis.from_euler(Vector3(deg_to_rad(-18.0), 0.0, 0.0)), Vector3(0.0, 2.0, 4.5))
	root_node.add_child(cam)
	cam.owner = root_node

	var light := DirectionalLight3D.new()
	light.name = "Sun"
	light.rotation_degrees = Vector3(-50.0, -30.0, 0.0)
	root_node.add_child(light)
	light.owner = root_node

	var ground := MeshInstance3D.new()
	ground.name = "Ground"
	var plane := PlaneMesh.new()
	plane.size = Vector2(12.0, 12.0)
	var gmat := StandardMaterial3D.new()
	gmat.albedo_color = Color(0.62, 0.53, 0.36)
	plane.material = gmat
	ground.mesh = plane
	root_node.add_child(ground)
	ground.owner = root_node

	var ui := CanvasLayer.new()
	ui.name = "UI"
	root_node.add_child(ui)
	ui.owner = root_node
	var label := Label.new()
	label.name = "Label"
	label.position = Vector2(24.0, 20.0)
	label.text = "FX gallery"
	label.add_theme_font_size_override("font_size", 28)
	ui.add_child(label)
	label.owner = root_node

	root_node.set_script(load(_GALLERY_SCRIPT))
	var packed := PackedScene.new()
	packed.pack(root_node)
	ResourceSaver.save(packed, "res://fx/effect_gallery.tscn")
	root_node.free()