class_name LuneTooltip
extends PanelContainer
## The one tooltip of the HUD. A single panel is reused for every hover: it appears after a
## short delay next to the hovered control, stays inside the window, never takes mouse input
## and hides as soon as the control is left, hidden, disabled for input, freed or clicked.
## Content is a small dictionary: title, subtitle, stats ([glyph, name, value] rows), text,
## note and warn. Components register with `LuneTooltip.attach(control, builder)`.

const DELAY: float = .28
const QUICK: float = .05
const WIDTH: float = 300.0

static var current: LuneTooltip

var _owner: Control
var _builder: Callable
var _wait: float = 0.0
var _last_hide: float = -10.0
var _clock: float = 0.0
var _column: VBoxContainer
## Last pointer position from input events (canvas coordinates); real and synthetic motion.
var _pointer: Vector2 = Vector2(-1, -1)

func _init() -> void:
	theme_type_variation = "HudTooltip"
	mouse_filter = Control.MOUSE_FILTER_IGNORE
	visible = false
	z_index = 100
	_column = VBoxContainer.new()
	_column.add_theme_constant_override("separation", 4)
	_column.mouse_filter = Control.MOUSE_FILTER_IGNORE
	add_child(_column)
	current = self

static func attach(control: Control, builder: Callable) -> void:
	control.mouse_entered.connect(func() -> void:
		if current != null and is_instance_valid(current):
			current.hover(control, builder))
	control.mouse_exited.connect(func() -> void:
		if current != null and is_instance_valid(current):
			current.leave(control))
	control.gui_input.connect(func(event: InputEvent) -> void:
		if event is InputEventMouseButton and event.pressed and current != null and is_instance_valid(current):
			current.leave(control))

func hover(control: Control, builder: Callable) -> void:
	if _pointer.x < 0.0:
		_pointer = control.get_global_mouse_position()
	_owner = control
	_builder = builder
	_wait = QUICK if _clock - _last_hide < .6 else DELAY
	visible = false

func leave(control: Control) -> void:
	if control == _owner:
		_hide()

func _hide() -> void:
	if visible:
		_last_hide = _clock
	_owner = null
	visible = false

## Refreshes the text of an open tooltip (values changed while hovering).
func refresh(control: Control) -> void:
	if control == _owner and visible:
		_show()

func _input(event: InputEvent) -> void:
	if event is InputEventMouse:
		_pointer = (event as InputEventMouse).position

func _process(delta: float) -> void:
	_clock += delta
	if _owner == null:
		return
	if not is_instance_valid(_owner) or not _owner.is_visible_in_tree() or not _owner.get_global_rect().has_point(_pointer):
		_hide()
		return
	if not visible:
		_wait -= delta
		if _wait <= 0.0:
			_show()

func _show() -> void:
	var content: Dictionary = _builder.call() if _builder.is_valid() else {}
	if content.is_empty():
		visible = false
		return
	for child: Node in _column.get_children():
		child.free()
	if content.has("title"):
		var head := HBoxContainer.new()
		head.add_theme_constant_override("separation", 6)
		head.mouse_filter = Control.MOUSE_FILTER_IGNORE
		_column.add_child(head)
		if content.has("glyph"):
			LuneGlyph.make(str(content.glyph), content.get("glyph_color", LuneUiTheme.BRONZE_LIGHT), 18.0, head)
		LuneUiTheme.label(str(content.title), "HudValue", head)
	if content.has("subtitle"):
		LuneUiTheme.label(str(content.subtitle), "HudMuted", _column)
	var stats: Array = content.get("stats", [])
	if not stats.is_empty():
		var grid := GridContainer.new()
		grid.columns = 3
		grid.add_theme_constant_override("h_separation", 8)
		grid.add_theme_constant_override("v_separation", 2)
		grid.mouse_filter = Control.MOUSE_FILTER_IGNORE
		_column.add_child(grid)
		for row: Array in stats:
			LuneGlyph.make(str(row[0]), LuneUiTheme.MUTED, 14.0, grid)
			LuneUiTheme.label(str(row[1]), "HudMuted", grid)
			var value := LuneUiTheme.label(str(row[2]), "HudText", grid)
			value.size_flags_horizontal = Control.SIZE_EXPAND_FILL
	for key: String in ["text", "note", "warn"]:
		if content.has(key) and not str(content[key]).is_empty():
			var line := LuneUiTheme.label(str(content[key]), "HudText" if key == "text" else "HudMuted", _column)
			line.autowrap_mode = TextServer.AUTOWRAP_WORD_SMART
			line.custom_minimum_size.x = WIDTH - 24.0
			if key == "warn":
				line.add_theme_color_override("font_color", LuneUiTheme.DANGER)
	visible = true
	reset_size()
	custom_minimum_size.x = 0.0
	await get_tree().process_frame
	if not visible or _owner == null or not is_instance_valid(_owner):
		return
	_place()

func _place() -> void:
	reset_size()
	var parent_rect: Rect2 = (get_parent() as Control).get_global_rect() if get_parent() is Control else get_viewport_rect()
	var anchor: Rect2 = _owner.get_global_rect()
	var scale_factor: float = get_global_transform().get_scale().x
	var extent: Vector2 = size * scale_factor
	var at := Vector2(anchor.get_center().x - extent.x * .5, anchor.position.y - extent.y - 8.0)
	if at.y < parent_rect.position.y + 6.0:
		at.y = anchor.end.y + 8.0
	at.x = clampf(at.x, parent_rect.position.x + 6.0, parent_rect.end.x - extent.x - 6.0)
	at.y = clampf(at.y, parent_rect.position.y + 6.0, parent_rect.end.y - extent.y - 6.0)
	global_position = at