extends CanvasLayer
## Character roster: pick one, or make one.
##
## Shown when the player has no character in the world -- at first login, and
## again when their last one dies. Permadeath makes this a screen players will
## see repeatedly, so dead characters stay listed rather than vanishing: seeing
## the run you lost is the point of keeping the record.

signal select_requested(character_id: String)
signal create_requested(character_name: String)
signal closed

var _list: VBoxContainer
var _name_field: LineEdit
var _create_button: Button
var _status: Label
var _title: Label
var _close_button: Button
var _known: Array[Dictionary] = []
var _rng := RandomNumberGenerator.new()
var _selected: String = ""


func _ready() -> void:
	layer = 30
	_rng.randomize()
	var root := UiTheme.themed_root()
	add_child(root)

	var scrim := ColorRect.new()
	scrim.color = Color(0.03, 0.03, 0.06, 0.92)
	scrim.set_anchors_and_offsets_preset(Control.PRESET_FULL_RECT)
	root.add_child(scrim)

	var centre := CenterContainer.new()
	centre.set_anchors_and_offsets_preset(Control.PRESET_FULL_RECT)
	root.add_child(centre)

	# A panel, so a dialog reads as a thing laid over the world rather
	# than as text floating on a dimmed one.
	var frame := UiTheme.dialog_panel()
	centre.add_child(frame)

	var panel := VBoxContainer.new()
	panel.custom_minimum_size = Vector2(460.0, 0.0)
	panel.add_theme_constant_override("separation", 8)
	frame.add_child(panel)

	_title = Label.new()
	_title.text = "CHARACTERS"
	_title.add_theme_font_size_override("font_size", 26)
	panel.add_child(_title)

	_list = VBoxContainer.new()
	_list.add_theme_constant_override("separation", 4)
	panel.add_child(_list)

	var spacer := Control.new()
	spacer.custom_minimum_size = Vector2(0.0, 10.0)
	panel.add_child(spacer)

	var row := HBoxContainer.new()
	panel.add_child(row)
	_name_field = LineEdit.new()
	_name_field.placeholder_text = "new character name"
	_name_field.text = Character.random_name(_rng)
	_name_field.max_length = Character.MAX_NAME
	_name_field.size_flags_horizontal = Control.SIZE_EXPAND_FILL
	row.add_child(_name_field)
	_create_button = Button.new()
	_create_button.text = "Create"
	_create_button.pressed.connect(_on_create)
	row.add_child(_create_button)

	_close_button = Button.new()
	_close_button.text = "Back to the hub"
	_close_button.pressed.connect(func() -> void: closed.emit())
	panel.add_child(_close_button)

	_status = Label.new()
	_status.add_theme_font_size_override("font_size", 12)
	_status.add_theme_color_override("font_color", Color(1.0, 0.6, 0.5))
	panel.add_child(_status)

	visible = false


func _on_create() -> void:
	var wanted := _name_field.text.strip_edges()
	if wanted.is_empty():
		set_status("give the character a name")
		return
	create_requested.emit(wanted)
	# Offer the next suggestion straight away rather than clearing to blank.
	_name_field.text = Character.random_name(_rng)


func set_status(text: String) -> void:
	_status.text = text


## Rebuild from the server's roster. Called on every change rather than diffed:
## the list is at most a handful of rows and correctness matters more than
## avoiding a few Control allocations.
func refresh(characters: Array[Dictionary], selected: String) -> void:
	_known = characters
	_selected = selected
	for child in _list.get_children():
		child.queue_free()

	# Everything the server sends is alive: a dead character is gone as far as
	# the player is concerned, and retirement is the server's own bookkeeping.
	var living := characters.size()
	for c in characters:
		_list.add_child(_row_for(c))

	if characters.is_empty():
		var empty := Label.new()
		empty.text = "No characters yet. Name one below to begin."
		empty.add_theme_color_override("font_color", Color(0.7, 0.75, 0.85))
		_list.add_child(empty)

	var room := living < CharacterStore.MAX_ACTIVE
	_create_button.disabled = not room
	_name_field.editable = room
	_title.text = "CHARACTERS   (%d / %d living)" % [living, CharacterStore.MAX_ACTIVE]
	if not room:
		set_status("%d living characters is the limit -- one must fall first"
			% CharacterStore.MAX_ACTIVE)


func _row_for(c: Dictionary) -> Control:
	var row := HBoxContainer.new()

	# The character's colour, which is its only identity until cosmetics exist.
	var swatch := ColorRect.new()
	swatch.color = c["colour"]
	swatch.custom_minimum_size = Vector2(14.0, 14.0)
	row.add_child(swatch)

	var playing := String(c["id"]) == _selected
	var label := Label.new()
	label.text = "  %s   level %d   %d hp%s" % [
		c["name"], int(c["level"]), int(c["max_hp"]),
		"   <- playing" if playing else ""]
	label.add_theme_color_override("font_color", Color(0.85, 0.9, 1.0))
	label.size_flags_horizontal = Control.SIZE_EXPAND_FILL
	row.add_child(label)

	var play := Button.new()
	play.text = "Play"
	play.disabled = playing
	play.pressed.connect(func() -> void: select_requested.emit(String(c["id"])))
	row.add_child(play)
	return row


## Whether the player may dismiss this screen. False when they have nothing to
## play, in which case there is nowhere to dismiss it to.
func set_dismissible(can_close: bool) -> void:
	_close_button.visible = can_close