extends TextEdit
class_name ContentFitTextEdit

signal confirmed(content)


const PLACEHOLDER_VISIBILITY = 0.35
const MAIN_THEME = preload("res://user_interface/main.theme")

export(NodePath) var expansion_target = @"."
export(int) var height_addition = 0
export(int) var min_height = 0
export(int) var max_height = 0
export(bool) var expand_width = false
export(int) var width_addition = 0
export(int) var min_width = 0
export(int) var max_width = 488
export(String) var placeholder = ""
export(bool) var confirm_on_focus_exit = false


var reference_label: Label
var width_reference_label: Label


func _ready():
	reference_label = Label.new()
	reference_label.name = "@@9"
	
	width_reference_label = Label.new()
	width_reference_label.name = "@@10"
	width_reference_label.theme = MAIN_THEME
	width_reference_label.self_modulate.a = 0.0
	width_reference_label.set_as_toplevel(true)
	
	reference_label.margin_top = 2.0
	reference_label.anchor_right = 1.0
	reference_label.margin_right = -9.0
	reference_label.autowrap = true
	
	add_child(reference_label)
	add_child(width_reference_label)
	
	_check_for_placeholder(false)
	
# warning-ignore:return_value_discarded
	connect("text_changed", self, "_on_text_changed")
# warning-ignore:return_value_discarded
	connect("resized", self, "_on_resized")
# warning-ignore:return_value_discarded
	connect("focus_entered", self, "_on_focus_entered")
# warning-ignore:return_value_discarded
	connect("focus_exited", self, "_on_focus_exited")


func _input(event):
	if has_focus():
		if event is InputEventKey and event.is_pressed():
			if event.scancode == KEY_ENTER and not event.shift:
				get_tree().set_input_as_handled()
				_confirm()


func _on_text_changed():
	adjust_size()
	if expand_width:
		# I honestly don't know why, but the second call helps with refreshing.
		adjust_size()


func _on_resized():
	_adjust_height()


func _on_focus_entered():
	if has_focus():
		_check_for_placeholder(true)


func _on_focus_exited():
	_check_for_placeholder(false)
	if confirm_on_focus_exit:
		_confirm()


func _confirm():
	emit_signal("confirmed", text)


func adjust_size():
	if expand_width:
		width_reference_label.rect_size.x = 1
		width_reference_label.text = text
		_adjust_width()
	reference_label.text = text
	_refresh()
	_adjust_height()


func _adjust_width():
	if is_connected("resized", self, "_on_resized"):
		disconnect("resized", self, "_on_resized")
	
	var target = get_node(expansion_target)
	
	# I swear I'm not doing this for fun.
	width_reference_label.visible = false
	width_reference_label.visible = true
	
	var width = width_reference_label.rect_size.x
	target.rect_min_size.x = clamp(width, min_width, max_width) + width_addition

	if not is_connected("resized", self, "_on_resized"):
# warning-ignore:return_value_discarded
		connect("resized", self, "_on_resized")


func _adjust_height():
	if is_connected("resized", self, "_on_resized"):
		disconnect("resized", self, "_on_resized")
	
	var target = get_node(expansion_target)
	
	var height = reference_label.rect_size.y + height_addition
	if max_height > 0:
		height = min(height, max_height)
	height = max(height, min_height)
	target.rect_min_size.y = height
	
	if not is_connected("resized", self, "_on_resized"):
# warning-ignore:return_value_discarded
		connect("resized", self, "_on_resized")


func _check_for_placeholder(focus: bool):
	if !focus and text.empty():
		reference_label.text = placeholder
		reference_label.self_modulate.a = PLACEHOLDER_VISIBILITY
	else:
		reference_label.self_modulate.a = 0.0


# Control sizes sometimes don't refresh properly, but this can be forces, by
# turning visibility off and on again.
func _refresh():
	var had_focus = has_focus()
	disconnect("focus_exited", self, "_on_focus_exited")
	visible = false
	visible = true
	if had_focus:
		grab_focus()
	_check_for_placeholder(had_focus)
# warning-ignore:return_value_discarded
	connect("focus_exited", self, "_on_focus_exited")