extends CanvasLayer
## Classic amber HUD, kept above touch sticks/buttons rather than over them.
const AMBER := Color(1.0, 0.66, 0.16)
const DANGER := Color(1.0, 0.22, 0.12)
var health_value: Label
var ammo_value: Label
var ammo_state: Label
var wave_value: Label
var grenade_value: Label
var help: Label
var root: Control
var boss_panel: VBoxContainer
var boss_name: Label
var boss_health: ProgressBar

func _ready() -> void:
	layer = 2
	root = Control.new()
	root.set_anchors_and_offsets_preset(Control.PRESET_FULL_RECT)
	root.mouse_filter = Control.MOUSE_FILTER_IGNORE
	add_child(root)
	var health := _panel("Health", false)
	_label(health, "+  VITA", 16, Vector2(16, 10))
	health_value = _label(health, "100", 42, Vector2(16, 27))
	var ammo := _panel("Ammo", true)
	_label(ammo, "CARICATORE", 16, Vector2(16, 10))
	ammo_value = _label(ammo, "30 / 30", 36, Vector2(16, 30))
	ammo_state = _label(ammo, "", 14, Vector2(16, 77))
	wave_value = _label(root, "", 18, Vector2.ZERO)
	wave_value.horizontal_alignment = HORIZONTAL_ALIGNMENT_CENTER
	wave_value.set_anchors_and_offsets_preset(Control.PRESET_CENTER_TOP)
	wave_value.offset_left = -160
	wave_value.offset_right = 160
	wave_value.offset_top = 15
	wave_value.offset_bottom = 45
	grenade_value = _label(root, "", 15, Vector2.ZERO)
	grenade_value.horizontal_alignment = HORIZONTAL_ALIGNMENT_CENTER
	grenade_value.set_anchors_and_offsets_preset(Control.PRESET_CENTER_TOP)
	grenade_value.offset_left = -160
	grenade_value.offset_right = 160
	grenade_value.offset_top = 44
	grenade_value.offset_bottom = 66
	help = _label(root, "WASD: muovi | mouse: mira | R: ricarica | destro: granata", 15, Vector2.ZERO)
	help.horizontal_alignment = HORIZONTAL_ALIGNMENT_CENTER
	help.set_anchors_and_offsets_preset(Control.PRESET_CENTER_BOTTOM)
	help.offset_left = -420
	help.offset_right = 420
	help.offset_top = -30
	help.offset_bottom = -8
	boss_panel = VBoxContainer.new()
	boss_panel.mouse_filter = Control.MOUSE_FILTER_IGNORE
	root.add_child(boss_panel)
	boss_panel.set_anchors_and_offsets_preset(Control.PRESET_CENTER_TOP)
	boss_panel.offset_left = -180
	boss_panel.offset_right = 180
	boss_panel.offset_top = 76
	boss_name = _label(boss_panel, "ALIEN GRUNT", 17, Vector2.ZERO)
	boss_name.horizontal_alignment = HORIZONTAL_ALIGNMENT_CENTER
	boss_health = ProgressBar.new()
	boss_health.mouse_filter = Control.MOUSE_FILTER_IGNORE
	boss_health.custom_minimum_size = Vector2(360, 18)
	boss_health.show_percentage = false
	boss_health.step = 0.0 # explosion falloff produces fractional health values
	boss_health.rounded = false
	var fill := StyleBoxFlat.new()
	fill.bg_color = Color(0.14, 0.85, 0.5)
	boss_health.add_theme_stylebox_override("fill", fill)
	var background := StyleBoxFlat.new()
	background.bg_color = Color(0.02, 0.05, 0.03, 0.9)
	background.border_color = AMBER
	background.set_border_width_all(1)
	boss_health.add_theme_stylebox_override("background", background)
	boss_panel.add_child(boss_health)
	boss_panel.hide()

func _panel(label: String, right: bool) -> Panel:
	var panel := Panel.new()
	panel.name = label
	panel.mouse_filter = Control.MOUSE_FILTER_IGNORE
	var style := StyleBoxFlat.new()
	style.bg_color = Color(0.025, 0.02, 0.008, 0.8)
	style.border_color = Color(1.0, 0.66, 0.16, 0.45)
	style.set_border_width_all(1)
	style.set_corner_radius_all(4)
	panel.add_theme_stylebox_override("panel", style)
	root.add_child(panel)
	panel.set_anchors_and_offsets_preset(Control.PRESET_TOP_RIGHT if right else Control.PRESET_TOP_LEFT)
	panel.offset_left = -224 if right else 16
	panel.offset_right = -16 if right else 224
	panel.offset_top = 16
	panel.offset_bottom = 116
	return panel

func _label(parent: Control, text: String, size: int, pos: Vector2) -> Label:
	var label := Label.new()
	label.text = text
	label.position = pos
	label.mouse_filter = Control.MOUSE_FILTER_IGNORE
	label.add_theme_color_override("font_color", AMBER)
	label.add_theme_color_override("font_shadow_color", Color.BLACK)
	label.add_theme_constant_override("shadow_offset_x", 1)
	label.add_theme_constant_override("shadow_offset_y", 1)
	label.add_theme_font_size_override("font_size", size)
	parent.add_child(label)
	return label

func update_boss(boss: Node) -> void:
	boss_panel.visible = is_instance_valid(boss) and not boss.dead
	if not boss_panel.visible:
		return
	boss_name.text = "ALIEN GRUNT — GRADO %d%s" % [boss.rank,
		" — ARRIVO" if boss.entering else "  |  %d / %d" % [ceili(boss.hp), ceili(boss.max_hp)]]
	boss_health.max_value = boss.max_hp
	boss_health.value = boss.hp

func update_status(player: Node, wave: int, score: int) -> void:
	health_value.text = str(maxi(0, ceili(player.hp)))
	health_value.add_theme_color_override("font_color", DANGER if player.hp <= 25 else AMBER)
	ammo_value.text = "%02d / 30" % player.ammo
	ammo_value.add_theme_color_override("font_color", DANGER if player.ammo <= 5 else AMBER)
	ammo_state.text = "RICARICA..." if player.reloading else ""
	wave_value.text = "ONDATA %d  |  PUNTI %d" % [wave, score]
	grenade_value.text = "GRANATA: " + ("PRONTA" if player.grenade_cooldown <= 0 else "%ds" % ceili(player.grenade_cooldown))
	help.visible = not player.touch_mode