extends VBoxContainer

const Brand := preload("res://scripts/ui/medmind_style.gd")
const Style := preload("res://scripts/ui/ui_style.gd")
const Cloze := preload("res://scripts/ui/flashcard_cloze.gd")

var main

var stats_row: HFlowContainer
var stat_due_value: Label
var stat_new_value: Label
var stat_decks_value: Label
var list_card: PanelContainer
var list_section_title: Label

var deck_selector: OptionButton
var deck_ids: Array = []
var new_deck_button: Button
var study_button: Button
var import_button: Button
var search_input: LineEdit
var type_filter: OptionButton
var state_filter: OptionButton
var new_card_button: Button
var status_label: Label
var list_scroll: ScrollContainer
var list_container: VBoxContainer
var debounce_timer: Timer

var editor_overlay: Control
var editor_panel: PanelContainer
var editor_deck_label: Label
var editor_note_id := ""
var editor_target_deck_id := ""
var editor_expected_revision: Variant = null
var editor_type_selector: OptionButton
var editor_front_input: TextEdit
var editor_back_input: TextEdit
var editor_extra_input: TextEdit
var editor_tags_input: LineEdit
var editor_hint_label: Label
var editor_error_label: Label

var import_menu: PanelContainer
var dropdown_backdrop: Control

var import_overlay: Control
var import_panel: PanelContainer
var import_summary_label: Label
var import_rows_container: VBoxContainer
var import_commit_button: Button
var import_pending_token := ""

var compact_layout := false

var decks: Array = []
var notes: Array = []


func _ready() -> void:
	size_flags_horizontal = Control.SIZE_EXPAND_FILL
	size_flags_vertical = Control.SIZE_EXPAND_FILL
	add_theme_constant_override("separation", 14)
	_build_dropdown_backdrop()
	_build_stats()
	_build_toolbar()
	_build_filters()
	status_label = Label.new()
	status_label.add_theme_font_override("font", Brand.font)
	add_child(status_label)

	list_card = PanelContainer.new()
	list_card.size_flags_vertical = Control.SIZE_EXPAND_FILL
	list_card.add_theme_stylebox_override("panel", _list_card_box(UIThemeService.is_dark_mode()))
	add_child(list_card)
	var list_card_content := VBoxContainer.new()
	list_card_content.add_theme_constant_override("separation", 10)
	list_card.add_child(list_card_content)
	list_section_title = _section_title("Your flashcards")
	list_card_content.add_child(list_section_title)
	list_scroll = ScrollContainer.new()
	list_scroll.size_flags_vertical = Control.SIZE_EXPAND_FILL
	list_card_content.add_child(list_scroll)
	list_container = VBoxContainer.new()
	list_container.size_flags_horizontal = Control.SIZE_EXPAND_FILL
	list_container.add_theme_constant_override("separation", 14)
	list_scroll.add_child(list_container)
	debounce_timer = Timer.new()
	debounce_timer.one_shot = true
	debounce_timer.wait_time = 0.35
	debounce_timer.timeout.connect(_reload_notes)
	add_child(debounce_timer)
	_build_editor_overlay()
	_build_import_overlay()
	resized.connect(_update_responsive_layout)
	call_deferred("_update_responsive_layout")

	FlashcardService.decks_changed.connect(_on_decks_changed)
	FlashcardService.notes_loaded.connect(_on_notes_loaded)
	FlashcardService.note_saved.connect(_on_note_saved)
	FlashcardService.request_failed.connect(_on_request_failed)
	FlashcardService.import_preview_ready.connect(_on_import_preview_ready)
	FlashcardService.import_committed.connect(_on_import_committed)
	UIThemeService.theme_changed.connect(func(_dark: bool): _refresh_status())


func on_show(_payload: Variant = null) -> void:
	FlashcardService.fetch_decks()
	_reload_notes()


func _build_stats() -> void:
	var previous_due := stat_due_value.text if stat_due_value != null else "--"
	var previous_new := stat_new_value.text if stat_new_value != null else "--"
	var previous_decks := stat_decks_value.text if stat_decks_value != null else "--"
	if stats_row == null:
		stats_row = HFlowContainer.new()
		stats_row.add_theme_constant_override("separation", 24)
		add_child(stats_row)
		move_child(stats_row, 0)
	for child in stats_row.get_children():
		child.queue_free()
	stat_due_value = _add_stat(stats_row, "Due today", "clock-3", Brand.AMBER)
	stat_new_value = _add_stat(stats_row, "New available", "clipboard-plus", Brand.ROYAL_BLUE)
	stat_decks_value = _add_stat(stats_row, "Decks", "clipboard-list", Brand.PURPLE)
	stat_due_value.text = previous_due
	stat_new_value.text = previous_new
	stat_decks_value.text = previous_decks


func _add_stat(row: HFlowContainer, title: String, icon_name: String, accent: Color) -> Label:
	var dark := UIThemeService.is_dark_mode()
	var cell := HBoxContainer.new()
	cell.custom_minimum_size = Vector2(200, 56)
	cell.add_theme_constant_override("separation", 12)
	row.add_child(cell)
	var icon_panel := PanelContainer.new()
	icon_panel.custom_minimum_size = Vector2(48, 48)
	icon_panel.size_flags_vertical = Control.SIZE_SHRINK_CENTER
	icon_panel.add_theme_stylebox_override("panel", Brand.icon_circle_box(dark, accent, 24))
	var icon := TextureRect.new()
	icon.texture = load("res://assets/icons/lucide/%s.svg" % icon_name)
	icon.custom_minimum_size = Vector2(22, 22)
	icon.expand_mode = TextureRect.EXPAND_IGNORE_SIZE
	icon.stretch_mode = TextureRect.STRETCH_KEEP_ASPECT_CENTERED
	icon_panel.add_child(icon)
	cell.add_child(icon_panel)
	var copy := VBoxContainer.new()
	copy.size_flags_vertical = Control.SIZE_SHRINK_CENTER
	var caption := Label.new()
	caption.text = title
	caption.add_theme_font_size_override("font_size", 13)
	caption.add_theme_color_override("font_color", Brand.muted_color(dark))
	copy.add_child(caption)
	var value := Label.new()
	value.text = "--"
	value.add_theme_font_size_override("font_size", 24)
	value.add_theme_color_override("font_color", Brand.text_color(dark))
	copy.add_child(value)
	cell.add_child(copy)
	return value


func _list_card_box(dark: bool) -> StyleBoxFlat:
	var box := StyleBoxFlat.new()
	box.bg_color = Color("081426") if dark else Color.WHITE
	box.border_color = Color("26344f") if dark else Brand.LIGHT_BORDER
	box.set_border_width_all(1)
	box.set_corner_radius_all(8)
	box.content_margin_left = 18
	box.content_margin_right = 18
	box.content_margin_top = 16
	box.content_margin_bottom = 16
	return box


func _section_title(text: String) -> Label:
	var label := Label.new()
	label.text = text
	label.add_theme_font_size_override("font_size", 16)
	label.add_theme_color_override("font_color", Brand.text_color(UIThemeService.is_dark_mode()))
	return label


func _build_toolbar() -> void:
	var row := HFlowContainer.new()
	row.add_theme_constant_override("separation", 10)
	add_child(row)

	deck_selector = OptionButton.new()
	deck_selector.add_item("All decks")
	deck_selector.custom_minimum_size = Vector2(200, 44)
	deck_selector.item_selected.connect(func(_index: int): _reload_notes())
	row.add_child(deck_selector)

	new_deck_button = Button.new()
	new_deck_button.text = "New Deck"
	new_deck_button.custom_minimum_size = Vector2(0, 44)
	new_deck_button.pressed.connect(_prompt_new_deck)
	row.add_child(new_deck_button)

	study_button = Button.new()
	study_button.text = "Study"
	study_button.custom_minimum_size = Vector2(110, 44)
	_style_primary_button(study_button)
	study_button.pressed.connect(_start_study)
	row.add_child(study_button)

	new_card_button = Button.new()
	new_card_button.text = "New Card"
	new_card_button.custom_minimum_size = Vector2(0, 44)
	new_card_button.pressed.connect(func(): _open_editor("", {}))
	row.add_child(new_card_button)

	import_button = Button.new()
	import_button.text = "Import"
	import_button.custom_minimum_size = Vector2(0, 44)
	import_button.pressed.connect(func(): _toggle_dropdown(import_menu, import_button))
	row.add_child(import_button)
	import_menu = _build_dropdown([
		["Import CSV...", func():
			status_label.text = "Choose a file to import..."
			FlashcardService.pick_import_file("csv")],
		["Import JSON...", func():
			status_label.text = "Choose a file to import..."
			FlashcardService.pick_import_file("json")],
	])


func _style_primary_button(button: Button) -> void:
	var normal := StyleBoxFlat.new()
	normal.bg_color = Brand.ROYAL_BLUE
	normal.set_corner_radius_all(6)
	var hover := normal.duplicate() as StyleBoxFlat
	hover.bg_color = Color("3474ee")
	button.add_theme_stylebox_override("normal", normal)
	button.add_theme_stylebox_override("hover", hover)
	button.add_theme_stylebox_override("pressed", normal)
	button.add_theme_color_override("font_color", Color.WHITE)
	button.add_theme_color_override("font_hover_color", Color.WHITE)


func _build_dropdown_backdrop() -> void:
	dropdown_backdrop = Control.new()
	dropdown_backdrop.visible = false
	dropdown_backdrop.top_level = true
	dropdown_backdrop.mouse_filter = Control.MOUSE_FILTER_STOP
	dropdown_backdrop.set_anchors_and_offsets_preset(Control.PRESET_FULL_RECT)
	dropdown_backdrop.gui_input.connect(func(event: InputEvent):
		if event is InputEventMouseButton and event.pressed:
			_close_dropdowns())
	add_child(dropdown_backdrop)


func _build_dropdown(items: Array) -> PanelContainer:
	var menu := PanelContainer.new()
	menu.visible = false
	menu.top_level = true
	menu.add_theme_stylebox_override("panel", Brand.panel_box(UIThemeService.is_dark_mode()))
	add_child(menu)
	var list := VBoxContainer.new()
	list.add_theme_constant_override("separation", 2)
	menu.add_child(list)
	for item in items:
		var button := Button.new()
		button.text = str(item[0])
		button.custom_minimum_size = Vector2(180, 40)
		button.alignment = HORIZONTAL_ALIGNMENT_LEFT
		var action: Callable = item[1]
		button.pressed.connect(func():
			_close_dropdowns()
			action.call())
		list.add_child(button)
	return menu


func _toggle_dropdown(menu: PanelContainer, anchor: Control) -> void:
	var was_visible := menu.visible
	_close_dropdowns()
	if was_visible:
		return
	menu.visible = true
	dropdown_backdrop.visible = true
	menu.position = anchor.get_global_position() + Vector2(0, anchor.size.y + 4)


func _close_dropdowns() -> void:
	if import_menu != null:
		import_menu.visible = false
	if dropdown_backdrop != null:
		dropdown_backdrop.visible = false


func _unhandled_input(event: InputEvent) -> void:
	if event.is_action_pressed("ui_cancel") and dropdown_backdrop != null and dropdown_backdrop.visible:
		_close_dropdowns()
		get_viewport().set_input_as_handled()


func _build_filters() -> void:
	var row := HFlowContainer.new()
	row.add_theme_constant_override("separation", 10)
	add_child(row)
	search_input = LineEdit.new()
	search_input.placeholder_text = "Search prompt or answer"
	search_input.custom_minimum_size = Vector2(260, 44)
	search_input.size_flags_horizontal = Control.SIZE_EXPAND_FILL
	search_input.text_changed.connect(func(_value: String): debounce_timer.start())
	row.add_child(search_input)
	type_filter = OptionButton.new()
	type_filter.add_item("All types")
	type_filter.add_item("Basic")
	type_filter.add_item("Cloze")
	type_filter.custom_minimum_size = Vector2(130, 44)
	type_filter.item_selected.connect(func(_index: int): _reload_notes())
	row.add_child(type_filter)
	state_filter = OptionButton.new()
	state_filter.add_item("All states")
	state_filter.add_item("New")
	state_filter.add_item("Learning")
	state_filter.add_item("Review")
	state_filter.add_item("Relearning")
	state_filter.add_item("Archived")
	state_filter.custom_minimum_size = Vector2(130, 44)
	state_filter.item_selected.connect(func(_index: int): _reload_notes())
	row.add_child(state_filter)


func _on_decks_changed(loaded_decks: Array) -> void:
	decks = loaded_decks
	var previous_selection: Variant = deck_ids[deck_selector.selected] if deck_selector.selected > 0 and deck_selector.selected < deck_ids.size() else null
	deck_selector.clear()
	deck_selector.add_item("All decks")
	deck_ids = [""]
	var total_due := 0
	var total_new := 0
	var my_decks := decks.filter(func(s): return not bool(s.get("deck", {}).get("isSystem", false)))
	var official_decks := decks.filter(func(s): return bool(s.get("deck", {}).get("isSystem", false)))
	if my_decks.size() > 0:
		deck_selector.add_separator("My Decks")
		deck_ids.append("")
		for summary in my_decks:
			var deck: Dictionary = summary.get("deck", {})
			deck_selector.add_item(str(deck.get("name", "Deck")))
			deck_ids.append(str(deck.get("id", "")))
	if official_decks.size() > 0:
		deck_selector.add_separator("Official Decks")
		deck_ids.append("")
		for summary in official_decks:
			var deck: Dictionary = summary.get("deck", {})
			deck_selector.add_item(str(deck.get("name", "Deck")))
			deck_ids.append(str(deck.get("id", "")))
	for summary in decks:
		total_due += int(summary.get("due", 0))
		total_new += int(summary.get("new", 0))
	if previous_selection != null:
		var restored := deck_ids.find(previous_selection)
		if restored >= 0:
			deck_selector.select(restored)
	if stat_due_value != null:
		stat_due_value.text = str(total_due)
		stat_new_value.text = str(total_new)
		stat_decks_value.text = str(decks.size())


func _selected_deck_id() -> String:
	if deck_selector.selected <= 0 or deck_selector.selected >= deck_ids.size():
		return ""
	return str(deck_ids[deck_selector.selected])


func _is_system_deck(id: String) -> bool:
	if id.is_empty():
		return false
	for summary in decks:
		var deck: Dictionary = summary.get("deck", {})
		if str(deck.get("id", "")) == id:
			return bool(deck.get("isSystem", false))
	return false


func _reload_notes() -> void:
	status_label.text = "Loading flashcards..."
	var query := {
		"deckId": _selected_deck_id(),
		"search": search_input.text,
		"type": ["", "basic", "cloze"][type_filter.selected],
		"state": ["", "new", "learning", "review", "relearning", "archived"][state_filter.selected],
		"page": 1,
		"pageSize": 100
	}
	FlashcardService.search_notes(query)


func _on_notes_loaded(response: Dictionary) -> void:
	notes = response.get("items", [])
	_render_notes()


func _render_notes() -> void:
	for child in list_container.get_children():
		child.queue_free()
	var dark := UIThemeService.is_dark_mode()
	if list_section_title != null:
		list_section_title.text = "Your flashcards (%d)" % notes.size()
	status_label.text = ""
	if notes.is_empty():
		var empty_label := Label.new()
		empty_label.text = "No flashcards match these filters yet."
		empty_label.add_theme_color_override("font_color", Brand.muted_color(dark))
		list_container.add_child(empty_label)
		return
	for index in notes.size():
		if index > 0:
			list_container.add_child(_row_separator(dark))
		list_container.add_child(_note_row(notes[index]))


func _note_row(note: Dictionary) -> Control:
	var dark := UIThemeService.is_dark_mode()
	var type_str := str(note.get("type", "basic"))
	var accent := Brand.TEAL if type_str == "cloze" else Brand.ROYAL_BLUE

	var row := BoxContainer.new()
	row.vertical = compact_layout
	row.add_theme_constant_override("separation", 14)

	var icon_panel := PanelContainer.new()
	icon_panel.custom_minimum_size = Vector2(40, 40)
	icon_panel.size_flags_vertical = Control.SIZE_SHRINK_CENTER
	icon_panel.add_theme_stylebox_override("panel", Brand.icon_circle_box(dark, accent, 20))
	var icon := TextureRect.new()
	icon.texture = load("res://assets/icons/lucide/%s.svg" % ("notebook-pen" if type_str == "cloze" else "clipboard-list"))
	icon.custom_minimum_size = Vector2(18, 18)
	icon.expand_mode = TextureRect.EXPAND_IGNORE_SIZE
	icon.stretch_mode = TextureRect.STRETCH_KEEP_ASPECT_CENTERED
	icon_panel.add_child(icon)
	row.add_child(icon_panel)

	var content := VBoxContainer.new()
	content.size_flags_horizontal = Control.SIZE_EXPAND_FILL
	content.add_theme_constant_override("separation", 4)
	row.add_child(content)

	var header_row := HBoxContainer.new()
	header_row.add_theme_constant_override("separation", 8)
	content.add_child(header_row)
	var type_label := Label.new()
	type_label.text = type_str.capitalize()
	type_label.add_theme_font_size_override("font_size", 12)
	type_label.add_theme_color_override("font_color", accent)
	header_row.add_child(type_label)
	var is_system := bool(note.get("isSystem", false))
	if is_system:
		var official_label := Label.new()
		official_label.text = "Official"
		official_label.add_theme_font_size_override("font_size", 12)
		official_label.add_theme_color_override("font_color", Brand.PURPLE)
		header_row.add_child(official_label)
	var tags: Array = note.get("tags", [])
	if tags.size() > 0:
		var tags_label := Label.new()
		tags_label.text = ", ".join(PackedStringArray(tags))
		tags_label.add_theme_font_size_override("font_size", 12)
		tags_label.add_theme_color_override("font_color", Brand.muted_color(dark))
		header_row.add_child(tags_label)

	var prompt_text := str(note.get("prompt", ""))
	var preview := Cloze.render_back(prompt_text) if type_str == "cloze" else prompt_text
	var prompt_label := Label.new()
	prompt_label.text = preview
	prompt_label.autowrap_mode = TextServer.AUTOWRAP_WORD_SMART
	prompt_label.add_theme_font_override("font", Brand.font)
	content.add_child(prompt_label)

	var actions := HBoxContainer.new()
	actions.add_theme_constant_override("separation", 8)
	row.add_child(actions)

	if not is_system:
		var edit_button := Button.new()
		edit_button.text = "Edit"
		edit_button.custom_minimum_size = Vector2(70, 40)
		edit_button.add_theme_stylebox_override("normal", Brand.secondary_button_box(dark))
		edit_button.add_theme_stylebox_override("hover", Brand.secondary_button_box(dark, true))
		edit_button.pressed.connect(_open_editor.bind(str(note.get("id", "")), note))
		actions.add_child(edit_button)

		var archive_button := Button.new()
		archive_button.text = "Archive"
		archive_button.custom_minimum_size = Vector2(85, 40)
		archive_button.add_theme_stylebox_override("normal", Brand.secondary_button_box(dark))
		archive_button.add_theme_stylebox_override("hover", Brand.secondary_button_box(dark, true))
		archive_button.add_theme_color_override("font_color", Color("ff5f76") if dark else Color("be123c"))
		archive_button.pressed.connect(func():
			FlashcardService.archive_notes([str(note.get("id", ""))], true)
			await get_tree().create_timer(0.3).timeout
			_reload_notes())
		actions.add_child(archive_button)

	return row


func _row_separator(dark: bool) -> ColorRect:
	var line := ColorRect.new()
	line.custom_minimum_size = Vector2(0, 1)
	line.color = Color("1c2b49") if dark else Brand.LIGHT_BORDER
	return line


# ---------- Note editor ----------

func _build_editor_overlay() -> void:
	editor_overlay = Control.new()
	editor_overlay.visible = false
	editor_overlay.top_level = true
	editor_overlay.mouse_filter = Control.MOUSE_FILTER_STOP
	editor_overlay.set_anchors_and_offsets_preset(Control.PRESET_FULL_RECT)
	add_child(editor_overlay)
	var dim := ColorRect.new()
	dim.color = Color(0, 0, 0, 0.72)
	dim.set_anchors_preset(Control.PRESET_FULL_RECT)
	dim.gui_input.connect(func(event: InputEvent):
		if event is InputEventMouseButton and event.pressed:
			_close_editor())
	editor_overlay.add_child(dim)
	var center := CenterContainer.new()
	center.set_anchors_preset(Control.PRESET_FULL_RECT)
	editor_overlay.add_child(center)
	editor_panel = PanelContainer.new()
	editor_panel.custom_minimum_size = Vector2(620, 560)
	editor_panel.add_theme_stylebox_override("panel", Brand.panel_box(UIThemeService.is_dark_mode()))
	center.add_child(editor_panel)
	var content := VBoxContainer.new()
	content.add_theme_constant_override("separation", 10)
	editor_panel.add_child(content)

	var header := HBoxContainer.new()
	content.add_child(header)
	var title := Label.new()
	title.text = "Flashcard"
	title.size_flags_horizontal = Control.SIZE_EXPAND_FILL
	title.add_theme_font_size_override("font_size", 22)
	header.add_child(title)
	var close_button := Button.new()
	close_button.icon = preload("res://assets/icons/lucide/x.svg")
	close_button.custom_minimum_size = Vector2(40, 40)
	close_button.pressed.connect(_close_editor)
	header.add_child(close_button)

	editor_deck_label = Label.new()
	editor_deck_label.add_theme_font_size_override("font_size", 13)
	editor_deck_label.add_theme_color_override("font_color", Brand.muted_color(UIThemeService.is_dark_mode()))
	content.add_child(editor_deck_label)

	editor_type_selector = OptionButton.new()
	editor_type_selector.add_item("Basic")
	editor_type_selector.add_item("Cloze")
	editor_type_selector.item_selected.connect(_on_editor_type_changed)
	content.add_child(editor_type_selector)

	editor_hint_label = Label.new()
	editor_hint_label.autowrap_mode = TextServer.AUTOWRAP_WORD_SMART
	editor_hint_label.add_theme_font_size_override("font_size", 12)
	editor_hint_label.add_theme_color_override("font_color", Brand.muted_color(UIThemeService.is_dark_mode()))
	content.add_child(editor_hint_label)

	content.add_child(_field_label("Front / Cloze text"))
	editor_front_input = TextEdit.new()
	editor_front_input.custom_minimum_size = Vector2(0, 100)
	editor_front_input.wrap_mode = TextEdit.LINE_WRAPPING_BOUNDARY
	content.add_child(editor_front_input)

	content.add_child(_field_label("Answer"))
	editor_back_input = TextEdit.new()
	editor_back_input.custom_minimum_size = Vector2(0, 80)
	editor_back_input.wrap_mode = TextEdit.LINE_WRAPPING_BOUNDARY
	content.add_child(editor_back_input)

	content.add_child(_field_label("Extra (optional teaching pearl)"))
	editor_extra_input = TextEdit.new()
	editor_extra_input.custom_minimum_size = Vector2(0, 60)
	editor_extra_input.wrap_mode = TextEdit.LINE_WRAPPING_BOUNDARY
	content.add_child(editor_extra_input)

	content.add_child(_field_label("Tags (comma separated)"))
	editor_tags_input = LineEdit.new()
	content.add_child(editor_tags_input)

	editor_error_label = Label.new()
	editor_error_label.add_theme_color_override("font_color", Style.RED)
	editor_error_label.visible = false
	content.add_child(editor_error_label)

	var save_button := Button.new()
	save_button.text = "Save"
	save_button.custom_minimum_size = Vector2(0, 46)
	_style_primary_button(save_button)
	save_button.pressed.connect(_save_editor)
	content.add_child(save_button)

	_on_editor_type_changed(0)


func _field_label(text: String) -> Label:
	var label := Label.new()
	label.text = text
	label.add_theme_font_size_override("font_size", 13)
	return label


func _on_editor_type_changed(index: int) -> void:
	editor_hint_label.text = (
		"Wrap the hidden answer in {{c1::answer}}, or {{c1::answer::hint}}. Reuse c1/c2/... to " +
		"create independently scheduled cards from the same sentence."
		if index == 1 else
		"Front is the question stem. Back is the correct answer plus key takeaway.")


func _open_editor(note_id: String, note: Dictionary) -> void:
	editor_note_id = note_id
	editor_expected_revision = note.get("revision", null)
	editor_type_selector.select(1 if str(note.get("type", "basic")) == "cloze" else 0)
	editor_front_input.text = str(note.get("prompt", ""))
	editor_back_input.text = str(note.get("answer", ""))
	editor_extra_input.text = str(note.get("extra", ""))
	editor_tags_input.text = ", ".join(PackedStringArray(note.get("tags", [])))
	editor_error_label.visible = false
	if note_id.is_empty():
		editor_target_deck_id = "" if _is_system_deck(_selected_deck_id()) else _selected_deck_id()
	else:
		editor_target_deck_id = str(note.get("deckId", ""))
	editor_deck_label.text = "Saving to: %s" % _deck_name_for_id(editor_target_deck_id)
	_on_editor_type_changed(editor_type_selector.selected)
	editor_overlay.visible = true


func _deck_name_for_id(id: String) -> String:
	if not id.is_empty():
		for summary in decks:
			var deck: Dictionary = summary.get("deck", {})
			if str(deck.get("id", "")) == id:
				return str(deck.get("name", "Default"))
	return "Default"


func _close_editor() -> void:
	editor_overlay.visible = false


func _save_editor() -> void:
	var is_cloze := editor_type_selector.selected == 1
	var prompt := editor_front_input.text.strip_edges()
	if prompt.is_empty():
		editor_error_label.text = "Front / cloze text is required."
		editor_error_label.visible = true
		return
	if is_cloze and not RegEx.create_from_string("\\{\\{c\\d+::").search(prompt):
		editor_error_label.text = "Cloze cards need at least one {{cN::answer}} marker."
		editor_error_label.visible = true
		return
	var tags: Array = []
	for tag in editor_tags_input.text.split(","):
		var trimmed := tag.strip_edges()
		if not trimmed.is_empty():
			tags.append(trimmed)
	var payload := {
		"deckId": editor_target_deck_id,
		"stableId": "",
		"type": "cloze" if is_cloze else "basic",
		"prompt": prompt,
		"answer": editor_back_input.text,
		"extra": editor_extra_input.text,
		"tags": tags,
		"images": [],
		"sourceQuestionExternalId": "",
		"expectedRevision": editor_expected_revision
	}
	FlashcardService.save_note(editor_note_id, payload)


func _on_note_saved(_note: Dictionary) -> void:
	_close_editor()
	_reload_notes()
	FlashcardService.fetch_decks()


func _on_request_failed(tag: String, message: String) -> void:
	if tag == "import_commit":
		import_commit_button.disabled = false
	editor_error_label.text = message
	editor_error_label.visible = true
	status_label.text = message


func _prompt_new_deck() -> void:
	FlashcardService.create_deck("New Deck %d" % (decks.size() + 1), "")


func _start_study() -> void:
	main.show_screen("flashcards_study", _selected_deck_id())


# ---------- Import preview / commit ----------

func _build_import_overlay() -> void:
	import_overlay = Control.new()
	import_overlay.visible = false
	import_overlay.top_level = true
	import_overlay.mouse_filter = Control.MOUSE_FILTER_STOP
	import_overlay.set_anchors_and_offsets_preset(Control.PRESET_FULL_RECT)
	add_child(import_overlay)
	var dim := ColorRect.new()
	dim.color = Color(0, 0, 0, 0.72)
	dim.set_anchors_preset(Control.PRESET_FULL_RECT)
	import_overlay.add_child(dim)
	var center := CenterContainer.new()
	center.set_anchors_preset(Control.PRESET_FULL_RECT)
	import_overlay.add_child(center)
	import_panel = PanelContainer.new()
	import_panel.custom_minimum_size = Vector2(620, 480)
	import_panel.add_theme_stylebox_override("panel", Brand.panel_box(UIThemeService.is_dark_mode()))
	center.add_child(import_panel)
	var content := VBoxContainer.new()
	content.add_theme_constant_override("separation", 10)
	import_panel.add_child(content)

	var header := HBoxContainer.new()
	content.add_child(header)
	var title := Label.new()
	title.text = "Import preview"
	title.size_flags_horizontal = Control.SIZE_EXPAND_FILL
	title.add_theme_font_size_override("font_size", 22)
	header.add_child(title)
	var close_button := Button.new()
	close_button.icon = preload("res://assets/icons/lucide/x.svg")
	close_button.custom_minimum_size = Vector2(40, 40)
	close_button.pressed.connect(_close_import_overlay)
	header.add_child(close_button)

	import_summary_label = Label.new()
	import_summary_label.autowrap_mode = TextServer.AUTOWRAP_WORD_SMART
	content.add_child(import_summary_label)

	var rows_scroll := ScrollContainer.new()
	rows_scroll.size_flags_vertical = Control.SIZE_EXPAND_FILL
	content.add_child(rows_scroll)
	import_rows_container = VBoxContainer.new()
	import_rows_container.size_flags_horizontal = Control.SIZE_EXPAND_FILL
	import_rows_container.add_theme_constant_override("separation", 4)
	rows_scroll.add_child(import_rows_container)

	var actions := HBoxContainer.new()
	actions.add_theme_constant_override("separation", 10)
	content.add_child(actions)
	var cancel_button := Button.new()
	cancel_button.text = "Cancel"
	cancel_button.custom_minimum_size = Vector2(0, 46)
	cancel_button.pressed.connect(_close_import_overlay)
	actions.add_child(cancel_button)
	import_commit_button = Button.new()
	import_commit_button.text = "Commit import"
	import_commit_button.custom_minimum_size = Vector2(0, 46)
	import_commit_button.size_flags_horizontal = Control.SIZE_EXPAND_FILL
	_style_primary_button(import_commit_button)
	import_commit_button.pressed.connect(_commit_pending_import)
	actions.add_child(import_commit_button)


func _on_import_preview_ready(preview: Dictionary) -> void:
	import_pending_token = str(preview.get("importToken", ""))
	var create_count := int(preview.get("createCount", 0))
	var update_count := int(preview.get("updateCount", 0))
	var skip_count := int(preview.get("skipCount", 0))
	var error_count := int(preview.get("errorCount", 0))
	import_summary_label.text = "%d to create, %d to update, %d to skip, %d row error(s)." % [create_count, update_count, skip_count, error_count]
	for child in import_rows_container.get_children():
		child.queue_free()
	for raw_row in preview.get("rows", []):
		import_rows_container.add_child(_import_row(raw_row))
	import_commit_button.disabled = import_pending_token.is_empty() or (create_count + update_count == 0)
	status_label.text = ""
	import_overlay.visible = true


func _import_row(row: Dictionary) -> Control:
	var label := Label.new()
	var action := str(row.get("action", ""))
	var error := str(row.get("error", ""))
	var detail := error if not error.is_empty() else str(row.get("prompt", ""))
	label.text = "Row %d - %s: %s" % [int(row.get("rowNumber", 0)), action.capitalize(), detail]
	label.autowrap_mode = TextServer.AUTOWRAP_WORD_SMART
	if action == "error":
		label.add_theme_color_override("font_color", Style.RED)
	return label


func _commit_pending_import() -> void:
	if import_pending_token.is_empty():
		return
	import_commit_button.disabled = true
	FlashcardService.commit_import(import_pending_token)


func _on_import_committed(result: Dictionary) -> void:
	import_overlay.visible = false
	import_pending_token = ""
	status_label.text = "Import complete: %d created, %d updated, %d skipped, %d error(s)." % [
		int(result.get("created", 0)), int(result.get("updated", 0)), int(result.get("skipped", 0)), int(result.get("errored", 0))]
	_reload_notes()
	FlashcardService.fetch_decks()


func _close_import_overlay() -> void:
	import_overlay.visible = false
	import_pending_token = ""


# ---------- Theme / responsive ----------

func _refresh_status() -> void:
	var dark := UIThemeService.is_dark_mode()
	if editor_panel != null:
		editor_panel.add_theme_stylebox_override("panel", Brand.panel_box(dark))
	if editor_deck_label != null:
		editor_deck_label.add_theme_color_override("font_color", Brand.muted_color(dark))
	if import_panel != null:
		import_panel.add_theme_stylebox_override("panel", Brand.panel_box(dark))
	if import_menu != null:
		import_menu.add_theme_stylebox_override("panel", Brand.panel_box(dark))
	if list_card != null:
		list_card.add_theme_stylebox_override("panel", _list_card_box(dark))
	if list_section_title != null:
		list_section_title.add_theme_color_override("font_color", Brand.text_color(dark))
	_build_stats()
	_render_notes()


func _update_responsive_layout() -> void:
	var use_compact := size.x < 720.0
	if compact_layout == use_compact:
		return
	compact_layout = use_compact
	search_input.custom_minimum_size.x = 0.0 if compact_layout else 260.0
	_render_notes()