tool
extends WindowDialog

signal generate_selected(lod)

const HTerrainMesher = preload("../hterrain_mesher.gd")
const Util = preload("../util/util.gd")

onready var _preview_label = $VBoxContainer/PreviewLabel
onready var _lod_spinbox = $VBoxContainer/HBoxContainer/LODSpinBox

var _terrain = null


func set_terrain(terrain):
	_terrain = terrain


func _notification(what):
	if what == NOTIFICATION_VISIBILITY_CHANGED:
		if visible:
			_update_preview()


func _on_LODSpinBox_value_changed(value):
	_update_preview()


func _update_preview():
	assert(_terrain != null)
	assert(_terrain.get_data() != null)
	var resolution = _terrain.get_data().get_resolution()
	var stride = int(_lod_spinbox.value)
	resolution /= stride
	var s = HTerrainMesher.get_mesh_size(resolution, resolution)
	_preview_label.text = str( \
		Util.format_integer(s.vertices), " vertices, ", \
		Util.format_integer(s.triangles), " triangles")


func _on_Generate_pressed():
	var stride = int(_lod_spinbox.value)
	emit_signal("generate_selected", stride)
	hide()


func _on_Cancel_pressed():
	hide()