extends VBoxContainer

const Brand := preload("res://scripts/ui/medmind_style.gd")
const QUESTION_TEXT_SCALE_MIN := 0.85
const QUESTION_TEXT_SCALE_MAX := 1.35
const QUESTION_TEXT_SCALE_STEP := 0.1
const CORE_BLOCK_SIZE_STEP := 5

var main: Control
var theme_toggle: CheckButton
var sound_toggle: CheckButton
var question_scale_value_label: Label
var ccs_scale_value_label: Label
var core_block_size_value_label: Label
var return_screen := ""
var back_to_session_button: Button


func _ready() -> void:
	set_anchors_and_offsets_preset(Control.PRESET_FULL_RECT)
	add_theme_constant_override("separation", 18)

	var eyebrow := Label.new()
	eyebrow.text = "PREFERENCES"
	eyebrow.add_theme_font_override("font", Brand.font)
	eyebrow.add_theme_font_size_override("font_size", 14)
	eyebrow.add_theme_color_override("font_color", Brand.SKY_BLUE)
	add_child(eyebrow)

	var title := Label.new()
	title.text = "Settings"
	title.add_theme_font_override("font", Brand.font)
	title.add_theme_font_size_override("font_size", 34)
	add_child(title)

	var subtitle := Label.new()
	subtitle.text = "Adjust RanaZe's appearance and interface sounds."
	subtitle.add_theme_font_override("font", Brand.font)
	subtitle.add_theme_font_size_override("font_size", 17)
	subtitle.add_theme_color_override("font_color", Brand.SLATE)
	add_child(subtitle)

	back_to_session_button = Button.new()
	back_to_session_button.text = "Back to session"
	back_to_session_button.custom_minimum_size = Vector2(0, 44)
	back_to_session_button.size_flags_horizontal = Control.SIZE_SHRINK_BEGIN
	back_to_session_button.add_theme_stylebox_override("normal", Brand.gradient_button_box())
	back_to_session_button.add_theme_color_override("font_color", Color.WHITE)
	back_to_session_button.visible = false
	UISoundService.set_button_sound(back_to_session_button, "back")
	back_to_session_button.pressed.connect(_return_to_session)
	add_child(back_to_session_button)

	var panel := PanelContainer.new()
	panel.custom_minimum_size = Vector2(520, 0)
	panel.size_flags_horizontal = Control.SIZE_SHRINK_BEGIN
	panel.add_theme_stylebox_override("panel", Brand.panel_box(UIThemeService.is_dark_mode()))
	add_child(panel)
	var content := VBoxContainer.new()
	content.add_theme_constant_override("separation", 18)
	panel.add_child(content)

	theme_toggle = CheckButton.new()
	theme_toggle.text = "Dark mode"
	theme_toggle.custom_minimum_size = Vector2(0, 52)
	theme_toggle.toggled.connect(_on_theme_toggled)
	content.add_child(theme_toggle)

	sound_toggle = CheckButton.new()
	sound_toggle.text = "Interface sounds"
	sound_toggle.custom_minimum_size = Vector2(0, 52)
	sound_toggle.toggled.connect(UISoundService.set_sounds_enabled)
	content.add_child(sound_toggle)

	content.add_child(_build_text_scale_row("Question bank text size", "question"))
	content.add_child(_build_text_scale_row("CCS case text size", "ccs"))
	content.add_child(_build_core_block_size_row())

	var legal_panel := PanelContainer.new()
	legal_panel.custom_minimum_size = Vector2(520, 0)
	legal_panel.size_flags_horizontal = Control.SIZE_SHRINK_BEGIN
	legal_panel.add_theme_stylebox_override("panel", Brand.panel_box(UIThemeService.is_dark_mode()))
	legal_panel.set_meta("legal_panel", true)
	add_child(legal_panel)
	var legal_content := VBoxContainer.new()
	legal_content.add_theme_constant_override("separation", 10)
	legal_panel.add_child(legal_content)
	var legal_heading := Label.new()
	legal_heading.text = "Legal"
	legal_heading.add_theme_font_override("font", Brand.font)
	legal_heading.add_theme_font_size_override("font_size", 20)
	legal_content.add_child(legal_heading)
	for spec in [["Terms of Service", "terms"], ["Privacy Policy", "privacy"]]:
		var button := Button.new()
		button.text = spec[0]
		button.alignment = HORIZONTAL_ALIGNMENT_LEFT
		button.pressed.connect(_open_legal_document.bind(str(spec[1])))
		legal_content.add_child(button)

	UIThemeService.theme_changed.connect(_on_theme_changed)
	AccountProfileService.profile_changed.connect(_refresh_text_scale_labels)
	CCSService.text_scale_changed.connect(_refresh_text_scale_labels)
	_refresh_text_scale_labels()


func on_show(payload: Variant = null) -> void:
	var wrapper: Dictionary = payload if typeof(payload) == TYPE_DICTIONARY else {}
	return_screen = str(wrapper.get("return_screen", ""))
	back_to_session_button.visible = not return_screen.is_empty()
	theme_toggle.set_pressed_no_signal(UIThemeService.is_dark_mode())
	sound_toggle.set_pressed_no_signal(UISoundService.are_sounds_enabled())
	_refresh_text_scale_labels()


func _build_text_scale_row(label_text: String, kind: String) -> HBoxContainer:
	var row := HBoxContainer.new()
	row.custom_minimum_size = Vector2(0, 52)
	row.add_theme_constant_override("separation", 12)

	var label := Label.new()
	label.text = label_text
	label.size_flags_horizontal = Control.SIZE_EXPAND_FILL
	row.add_child(label)

	var smaller := Button.new()
	smaller.text = "A-"
	smaller.tooltip_text = "Decrease text size"
	smaller.custom_minimum_size = Vector2(44, 44)
	row.add_child(smaller)

	var value_label := Label.new()
	value_label.custom_minimum_size = Vector2(56, 0)
	value_label.horizontal_alignment = HORIZONTAL_ALIGNMENT_CENTER
	row.add_child(value_label)

	var larger := Button.new()
	larger.text = "A+"
	larger.tooltip_text = "Increase text size"
	larger.custom_minimum_size = Vector2(44, 44)
	row.add_child(larger)

	if kind == "question":
		question_scale_value_label = value_label
		smaller.pressed.connect(_adjust_question_text_scale.bind(-QUESTION_TEXT_SCALE_STEP))
		larger.pressed.connect(_adjust_question_text_scale.bind(QUESTION_TEXT_SCALE_STEP))
	else:
		ccs_scale_value_label = value_label
		smaller.pressed.connect(_adjust_ccs_text_scale.bind(-CCSService.TEXT_SCALE_STEP))
		larger.pressed.connect(_adjust_ccs_text_scale.bind(CCSService.TEXT_SCALE_STEP))
	return row


func _build_core_block_size_row() -> HBoxContainer:
	var row := HBoxContainer.new()
	row.custom_minimum_size = Vector2(0, 52)
	row.add_theme_constant_override("separation", 12)

	var label := Label.new()
	label.text = "Question block size"
	label.size_flags_horizontal = Control.SIZE_EXPAND_FILL
	row.add_child(label)

	var smaller := Button.new()
	smaller.text = "-"
	smaller.tooltip_text = "Fewer questions per block"
	smaller.custom_minimum_size = Vector2(44, 44)
	smaller.pressed.connect(_adjust_core_block_size.bind(-CORE_BLOCK_SIZE_STEP))
	row.add_child(smaller)

	core_block_size_value_label = Label.new()
	core_block_size_value_label.custom_minimum_size = Vector2(56, 0)
	core_block_size_value_label.horizontal_alignment = HORIZONTAL_ALIGNMENT_CENTER
	row.add_child(core_block_size_value_label)

	var larger := Button.new()
	larger.text = "+"
	larger.tooltip_text = "More questions per block"
	larger.custom_minimum_size = Vector2(44, 44)
	larger.pressed.connect(_adjust_core_block_size.bind(CORE_BLOCK_SIZE_STEP))
	row.add_child(larger)
	return row


func _adjust_core_block_size(delta: int) -> void:
	BlockSessionService.set_core_block_size(BlockSessionService.core_block_size + delta)
	_refresh_text_scale_labels()


func _adjust_question_text_scale(delta: float) -> void:
	var current: float = AccountProfileService.preferences.get("questionTextScale", 1.0)
	var next_scale: float = clamp(current + delta, QUESTION_TEXT_SCALE_MIN, QUESTION_TEXT_SCALE_MAX)
	AccountProfileService.update_text_scale(next_scale)
	_refresh_text_scale_labels()


func _adjust_ccs_text_scale(delta: float) -> void:
	CCSService.adjust_text_scale(delta)
	_refresh_text_scale_labels()


func _refresh_text_scale_labels() -> void:
	if question_scale_value_label != null:
		var question_scale: float = AccountProfileService.preferences.get("questionTextScale", 1.0)
		question_scale_value_label.text = "%d%%" % round(question_scale * 100)
	if ccs_scale_value_label != null:
		ccs_scale_value_label.text = "%d%%" % round(CCSService.text_scale * 100)
	if core_block_size_value_label != null:
		core_block_size_value_label.text = str(BlockSessionService.core_block_size)


func _on_theme_toggled(enabled: bool) -> void:
	UIThemeService.set_dark_mode(enabled)


func _open_legal_document(kind: String) -> void:
	main.open_legal_document(kind)


func _return_to_session() -> void:
	if return_screen.is_empty():
		return
	main.show_screen(return_screen)


func _on_theme_changed(is_dark: bool) -> void:
	theme_toggle.set_pressed_no_signal(is_dark)
	var panel := theme_toggle.get_parent().get_parent() as PanelContainer
	if panel != null:
		panel.add_theme_stylebox_override("panel", Brand.panel_box(is_dark))
	for node in get_children():
		if node is PanelContainer and node.has_meta("legal_panel"):
			node.add_theme_stylebox_override("panel", Brand.panel_box(is_dark))