extends CanvasLayer

@onready var debug_toggle: Button = $HUDRoot/DebugToggle
@onready var debug_info: Label = $HUDRoot/DebugInfo
@onready var player: CharacterBody2D = get_parent().get_node("PlayerShip")
@onready var inventory_button: Button = $HUDRoot/ShipEquipmentPanel/Contents/InventoryButton
@onready var inventory_panel: Control = $HUDRoot/ShipInventoryPanel

var _debug_expanded := true
var _ability_buttons: Dictionary = {}
var _ability_bar: HBoxContainer

func _ready() -> void:
	_create_ability_bar()
	debug_toggle.pressed.connect(_toggle_debug)
	inventory_button.pressed.connect(_toggle_inventory)
	_update_debug_toggle()
	$HUDRoot/CaptainPanel.resized.connect(func() -> void: _layout_sidebar.call_deferred())
	_layout_sidebar.call_deferred()

func _layout_sidebar() -> void:
	var captain_panel := $HUDRoot/CaptainPanel as Control
	var equipment_panel := $HUDRoot/ShipEquipmentPanel as Control
	captain_panel.grow_vertical = Control.GROW_DIRECTION_END
	equipment_panel.grow_vertical = Control.GROW_DIRECTION_END
	equipment_panel.position.y = captain_panel.position.y + captain_panel.size.y + 6.0
	equipment_panel.size.y = equipment_panel.get_combined_minimum_size().y

func _process(_delta: float) -> void:
	_update_ability_bar()
	if not _debug_expanded:
		return

	var ship_position := player.global_position
	var ship_velocity := player.velocity
	var angular_speed := float(player.get("angular_velocity"))
	var game := get_parent()
	var enemy_count: int = game.call("get_remaining_enemies")
	var goal: Node2D = game.get("protected_planet")
	var to_planet := goal.global_position - player.global_position
	debug_info.text = """STEROWANIE
W: ciąg   S: hamulec / wsteczny
Q / E: strafe   A / D: obrót
LPM / PPM: broń 1 / broń 2
1–6: aktywne rozszerzenia

UKŁAD: %d · PLANETY: %d
WROGOWIE: %d
CEL: %s
PLANETA RASY: %.0f px · %.0f°

STATEK
KADŁUB:  %d / %d
TARCZE:  %d / %d
ENERGIA: %d / %d
REGEN E / T: %.1f / %.1f /s

RUCH
PRĘDKOŚĆ: %.1f px/s
WEKTOR: [%.1f, %.1f] px/s
POZYCJA: [%.1f, %.1f]
KIERUNEK: %.1f°
OBRÓT: %.2f rad/s""" % [
		GameState.system_level, int(game.get("system_data")["planets"].size()), enemy_count,
		"Odwiedź chronioną rasę" if bool(game.get("system_cleared")) else "Oczyść układ",
		to_planet.length(), wrapf(rad_to_deg(to_planet.angle()) + 90.0, 0.0, 360.0),
		roundi(float(player.get("hull"))), roundi(float(player.get("max_hull"))),
		roundi(float(player.get("shields"))), roundi(float(player.get("max_shields"))),
		roundi(float(player.get("energy"))), roundi(float(player.get("max_energy"))),
		float(player.get("energy_regeneration")),
		float(player.get("shield_regeneration")),
		ship_velocity.length(), ship_velocity.x, ship_velocity.y,
		ship_position.x, ship_position.y, rad_to_deg(player.rotation), angular_speed,
	]

func _toggle_debug() -> void:
	_debug_expanded = not _debug_expanded
	debug_info.visible = _debug_expanded
	_update_debug_toggle()

func _update_debug_toggle() -> void:
	debug_toggle.text = "DEBUG [−]" if _debug_expanded else "DEBUG [+]"

func _toggle_inventory() -> void:
	inventory_panel.visible = not inventory_panel.visible

func _create_ability_bar() -> void:
	var panel := PanelContainer.new()
	panel.name = "ActiveAbilities"
	$HUDRoot.add_child(panel)
	panel.set_anchors_and_offsets_preset(Control.PRESET_BOTTOM_LEFT)
	panel.offset_left = 12.0
	panel.offset_right = 12.0
	panel.offset_top = -54.0
	panel.offset_bottom = -12.0
	_ability_bar = HBoxContainer.new()
	_ability_bar.add_theme_constant_override("separation", 4)
	panel.add_child(_ability_bar)
	for index in 6:
		var button := Button.new()
		button.name = "Ability%d" % (index + 1)
		button.custom_minimum_size = Vector2(120, 40)
		button.add_theme_font_size_override("font_size", 11)
		button.pressed.connect(func() -> void: player.call("activate_ability", index))
		_ability_bar.add_child(button)
		_ability_buttons[index] = button
	_update_ability_bar()

func _update_ability_bar() -> void:
	var any_equipped := false
	for index in _ability_buttons:
		var button: Button = _ability_buttons[index]
		var ability: ActiveAbility = player.call("get_active_ability", index)
		button.visible = ability != null
		if ability == null:
			continue
		any_equipped = true
		var reason: String = player.call("ability_unavailable_reason", index)
		button.disabled = not reason.is_empty()
		button.text = "[%d] %s" % [index + 1, ability.display_name]
		button.tooltip_text = ability.description + ("\n" + reason if not reason.is_empty() else "\nGotowe")
	_ability_bar.get_parent().visible = any_equipped