extends Node3D
## M0 mood props — a few low-poly trees and rocks built from primitives in code,
## so the scene looks "alive" with no imported assets. These are placeholders;
## real low-poly models (free asset packs, see docs/ROADMAP.md M0) replace them.
##
## place_on(terrain) is called by world.gd once the terrain exists, so each prop
## sits on the real ground height instead of floating at Y=0.

var _terrain: Node3D

func place_on(terrain: Node3D) -> void:
	_terrain = terrain
	var rng := RandomNumberGenerator.new()
	rng.seed = 42
	for i in range(18):
		var x := rng.randf_range(-55.0, 55.0)
		var z := rng.randf_range(-55.0, 55.0)
		var y: float = _terrain.sample_height(x, z)
		if rng.randf() < 0.65:
			_make_tree(Vector3(x, y, z), rng)
		else:
			_make_rock(Vector3(x, y, z), rng)

func _make_tree(pos: Vector3, rng: RandomNumberGenerator) -> void:
	var root := Node3D.new()
	root.position = pos
	add_child(root)

	var trunk := MeshInstance3D.new()
	var tm := CylinderMesh.new()
	tm.top_radius = 0.18
	tm.bottom_radius = 0.28
	tm.height = 3.0
	trunk.mesh = tm
	trunk.position = Vector3(0, 1.5, 0)
	trunk.material_override = _mat(Color(0.33, 0.24, 0.16))
	root.add_child(trunk)

	# Collision: a capsule around the trunk so you can't walk through the tree.
	var body := StaticBody3D.new()
	root.add_child(body)
	var col := CollisionShape3D.new()
	var cap := CapsuleShape3D.new()
	cap.radius = 0.35
	cap.height = 4.0
	col.shape = cap
	col.position = Vector3(0, 2.0, 0)
	body.add_child(col)

	# Low-poly conifer canopy: stacked cones.
	var h := 3.0
	for j in range(3):
		var cone := MeshInstance3D.new()
		var cm := CylinderMesh.new()
		cm.top_radius = 0.0
		cm.bottom_radius = 1.6 - j * 0.4
		cm.height = 1.6
		cm.radial_segments = 6   # low-poly
		cone.mesh = cm
		cone.position = Vector3(0, h + j * 1.0, 0)
		cone.material_override = _mat(Color(0.16, 0.34, 0.2))
		root.add_child(cone)

	root.rotate_y(rng.randf_range(0, TAU))
	var s := rng.randf_range(0.85, 1.35)
	root.scale = Vector3(s, s, s)

func _make_rock(pos: Vector3, rng: RandomNumberGenerator) -> void:
	var rock := MeshInstance3D.new()
	var bm := BoxMesh.new()
	var box_size := Vector3(rng.randf_range(0.8, 1.8), rng.randf_range(0.6, 1.2), rng.randf_range(0.8, 1.8))
	bm.size = box_size
	rock.mesh = bm
	rock.position = pos + Vector3(0, 0.3, 0)
	rock.rotation = Vector3(rng.randf_range(-0.2, 0.2), rng.randf_range(0, TAU), rng.randf_range(-0.2, 0.2))
	rock.material_override = _mat(Color(0.42, 0.42, 0.45))
	add_child(rock)

	# Collision: a box matching the rock mesh.
	var body := StaticBody3D.new()
	body.position = rock.position
	body.rotation = rock.rotation
	add_child(body)
	var col := CollisionShape3D.new()
	var box := BoxShape3D.new()
	box.size = box_size
	col.shape = box
	body.add_child(col)

func _mat(c: Color) -> StandardMaterial3D:
	var m := StandardMaterial3D.new()
	m.albedo_color = c
	m.roughness = 0.95
	return m