# (c) 2023-present Eroax
# (c) 2023-present Yagich
# GNU General Public License v3.0+ (see COPYING or https://www.gnu.org/licenses/gpl-3.0.txt)
extends Control
class_name DeckHolderRenderer

## Renderer class for [DeckHolder]
##
## Entry point for the [GraphEdit] based Renderer

## Reference to the base scene for [DeckRessssssndererGraphEdit]
const DECK_SCENE := preload("res://graph_node_renderer/deck_renderer_graph_edit.tscn")
const DEBUG_DECKS_LIST := preload("res://graph_node_renderer/debug_decks_list.tscn")

const PERSISTENCE_NAMESPACE := "default"

## Reference to the main windows [TabContainerCustom]
@onready var tab_container := %TabContainerCustom as TabContainerCustom
## Reference to the [FileDialog] used for File operations through the program.
@onready var file_dialog: FileDialog = $FileDialog

@export var new_deck_shortcut: Shortcut
@export var open_deck_shortcut: Shortcut
@export var save_deck_shortcut: Shortcut
@export var save_deck_as_shortcut: Shortcut
@export var close_deck_shortcut: Shortcut

## Enum for storing the Options in the "File" PopupMenu.
enum FileMenuId {
	NEW,
	OPEN,
	SAVE = 3,
	SAVE_AS,
	CLOSE = 6,
	RECENTS,
}
@onready var file_popup_menu: PopupMenu = %File as PopupMenu
var max_recents := 4
var recent_files := []
var recent_path: String
@onready var unsaved_changes_dialog_single_deck := $UnsavedChangesDialogSingleDeck as UnsavedChangesDialogSingleDeck
@onready var unsaved_changes_dialog: ConfirmationDialog = $UnsavedChangesDialog

enum ConnectionsMenuId {
	OBS,
	TWITCH,
}

enum DebugMenuId {
	DECKS,
	EMBED_SUBWINDOWS,
}
@onready var debug_popup_menu: PopupMenu = %Debug

enum HelpMenuId {
	DOCS,
	ABOUT,
}
@onready var about_dialog: AcceptDialog = %AboutDialog

## Weak Reference to the Deck that is currently going to be saved.
var _deck_to_save: WeakRef

@onready var no_obsws := %NoOBSWS as NoOBSWS

@onready var obs_setup_dialog := $OBSWebsocketSetupDialog as OBSWebsocketSetupDialog
@onready var twitch_setup_dialog := $Twitch_Setup_Dialog as TwitchSetupDialog
@onready var bottom_dock: BottomDock = %BottomDock


func _ready() -> void:
	get_tree().auto_accept_quit = false
	tab_container.add_button_pressed.connect(add_empty_deck)
	tab_container.tab_changed.connect(_on_tab_container_tab_changed)
	tab_container.tab_about_to_change.connect(_on_tab_container_tab_about_to_change)
	RendererPersistence.init_namespace(PERSISTENCE_NAMESPACE)
	
	var embed_subwindows: bool = RendererPersistence.get_or_create(PERSISTENCE_NAMESPACE, "config", "embed_subwindows", true)
	debug_popup_menu.set_item_checked(
		DebugMenuId.EMBED_SUBWINDOWS,
		embed_subwindows
		)
	
	get_tree().get_root().gui_embed_subwindows = embed_subwindows
	file_dialog.use_native_dialog = !embed_subwindows
	
	recent_files = RendererPersistence.get_or_create(
		PERSISTENCE_NAMESPACE, "config",
		"recent_files", []
		)
	recent_path = RendererPersistence.get_or_create(
		PERSISTENCE_NAMESPACE, "config",
		"recent_path", OS.get_system_dir(OS.SYSTEM_DIR_DOCUMENTS)
	)
	add_recents_to_menu()

	tab_container.tab_close_requested.connect(
		func(tab: int):
			if tab_container.get_tab_metadata(tab, "dirty") && !tab_container.get_tab_metadata(tab, "group"):
				unsaved_changes_dialog_single_deck.set_meta("tab", tab)
				unsaved_changes_dialog_single_deck.show()
				return
			await close_tab(tab)
	)

	file_dialog.canceled.connect(disconnect_file_dialog_signals)
	Connections.obs_websocket = no_obsws
	Connections.twitch = %Twitch_Connection
	
	Connections.twitch.chat_socket.chat_received_rich.connect(Connections._twitch_chat_received)
	
	file_popup_menu.set_item_shortcut(FileMenuId.NEW, new_deck_shortcut)
	file_popup_menu.set_item_shortcut(FileMenuId.OPEN, open_deck_shortcut)
	file_popup_menu.set_item_shortcut(FileMenuId.SAVE, save_deck_shortcut)
	file_popup_menu.set_item_shortcut(FileMenuId.SAVE_AS, save_deck_as_shortcut)
	file_popup_menu.set_item_shortcut(FileMenuId.CLOSE, close_deck_shortcut)
	
	bottom_dock.variable_viewer.top_field_edited.connect(
		func(old_name: String, new_name: String, new_value: Variant) -> void:
			get_active_deck().update_variable(old_name, new_name, new_value)
	)
	
	bottom_dock.variable_viewer.top_field_removed.connect(
		func(field_name: String) -> void:
			get_active_deck().remove_variable(field_name)
	)


func _on_tab_container_tab_about_to_change(previous_tab: int) -> void:
	var deck := get_deck_at_tab(previous_tab)
	if deck.variables_updated.is_connected(bottom_dock.rebuild_variable_tree):
		deck.variables_updated.disconnect(bottom_dock.rebuild_variable_tree)


func _on_tab_container_tab_changed(tab: int) -> void:
	var is_group = tab_container.get_tab_metadata(tab, "group", false)
	file_popup_menu.set_item_disabled(FileMenuId.SAVE, is_group)
	file_popup_menu.set_item_disabled(FileMenuId.SAVE_AS, is_group)
	bottom_dock.rebuild_variable_tree(get_active_deck().variable_stack)
	var deck := get_active_deck()
	deck.variables_updated.connect(bottom_dock.rebuild_variable_tree.bind(deck.variable_stack))


## Called when the File button in the [MenuBar] is pressed with the [param id]
## of the button within it that was pressed.
func _on_file_id_pressed(id: int) -> void:
	match id:
		FileMenuId.NEW:
			add_empty_deck()
		FileMenuId.OPEN:
			open_open_dialog(recent_path)
		FileMenuId.SAVE when tab_container.get_tab_count() > 0:
			save_active_deck()
		FileMenuId.SAVE_AS when tab_container.get_tab_count() > 0:
			open_save_dialog(tab_container.get_tab_metadata(tab_container.get_current_tab(), "path"))
		FileMenuId.CLOSE:
			close_current_tab()
		_ when id in range(FileMenuId.RECENTS, FileMenuId.RECENTS + max_recents + 1):
			open_deck_at_path(recent_files[id - FileMenuId.RECENTS - 1])

## Adds an empty [DeckRendererGraphEdit] with a corresponding [Deck] for it's data.
func add_empty_deck() -> void:
	var deck := DeckHolder.add_empty_deck()
	var inst: DeckRendererGraphEdit = DECK_SCENE.instantiate()
	inst.deck = deck
	var tab := tab_container.add_content(inst, "<unsaved deck>")
	tab_container.set_tab_metadata(tab, "id", deck.id)
	tab_container.set_tab_metadata(tab, "group", false)
	tab_container.set_tab_metadata(tab, "path", recent_path.path_join(""))
	inst.group_enter_requested.connect(_on_deck_renderer_group_enter_requested)
	inst.dirty_state_changed.connect(_on_deck_renderer_dirty_state_changed.bind(inst))
	tab_container.set_current_tab(tab)
	bottom_dock.variable_viewer.enable_new_button()

## Closes the current tab in [member tab_container]
func close_current_tab() -> void:
	tab_container.close_tab(tab_container.get_current_tab())


func close_tab(tab: int) -> void:
	if !tab_container.get_tab_metadata(tab, "group"):
		var groups := DeckHolder.close_deck(tab_container.get_tab_metadata(tab, "id"))
		# close tabs associated with this deck's groups
		for group in groups:
			for c_tab in range(tab_container.get_tab_count() - 1, -1, -1):
				if tab_container.get_tab_metadata(c_tab, "id") == group:
					tab_container.close_tab(c_tab)
					await get_tree().process_frame
	
	tab_container.close_tab(tab)
	if tab_container.get_tab_count() == 0:
		bottom_dock.variable_viewer.disable_new_button()

## Opens [member file_dialog] with the mode [member FileDialog.FILE_MODE_SAVE_FILE]
## as well as getting a weakref to the active [Deck]
func open_save_dialog(path: String) -> void:
	file_dialog.file_mode = FileDialog.FILE_MODE_SAVE_FILE
	file_dialog.title = "Save a Deck"
	file_dialog.current_path = path
	_deck_to_save = weakref(get_active_deck())
	file_dialog.popup_centered()
	file_dialog.file_selected.connect(_on_file_dialog_save_file, CONNECT_ONE_SHOT)

## Opens [member file_dialog] with the mode [FileDialog.FILE_MODE_OPEN_FILES]
## with the supplied [param path]
func open_open_dialog(path: String) -> void:
	file_dialog.file_mode = FileDialog.FILE_MODE_OPEN_FILES
	file_dialog.title = "Open Deck(s)"
	file_dialog.current_path = path + "/"
	file_dialog.popup_centered()
	file_dialog.files_selected.connect(_on_file_dialog_open_files, CONNECT_ONE_SHOT)

## Connected to [signal FileDialog.save_file] on [member file_dialog].
## Saves the selected [Deck] if it still exists.
func _on_file_dialog_save_file(path: String) -> void:
	var deck: Deck = _deck_to_save.get_ref() as Deck
	if !deck:
		return

	deck.save_path = path
	tab_container.set_tab_title(tab_container.get_current_tab(), path.get_file())
	var renderer: DeckRendererGraphEdit = tab_container.get_content(tab_container.get_current_tab()) as DeckRendererGraphEdit
	renderer.dirty = false
	# TODO: put this into DeckHolder instead
	var json := JSON.stringify(deck.to_dict(), "\t")
	var f := FileAccess.open(path, FileAccess.WRITE)
	f.store_string(json)
	add_recent_file(get_active_deck().save_path)
	recent_path = path.get_base_dir()
	RendererPersistence.set_value(PERSISTENCE_NAMESPACE, "config", "recent_path", recent_path)


## Connected to [signal FileDialog.open_files] on [member file_dialog].  Opens
## the selected paths, instantiating [DeckRenderGraphEdit]s and [Deck]s for each.
func _on_file_dialog_open_files(paths: PackedStringArray) -> void:
	for path in paths:
		open_deck_at_path(path)


func open_deck_at_path(path: String) -> void:
	for tab in tab_container.get_tab_count():
		if tab_container.get_tab_metadata(tab, "path") == path:
			tab_container.set_current_tab(tab)
			return
			
	var deck := DeckHolder.open_deck_from_file(path)
	var inst: DeckRendererGraphEdit = DECK_SCENE.instantiate()
	inst.deck = deck
	var tab := tab_container.add_content(inst, path.get_file())
	tab_container.set_tab_metadata(tab, "id", deck.id)
	tab_container.set_tab_metadata(tab, "group", false)
	tab_container.set_tab_metadata(tab, "path", path)
	inst.initialize_from_deck()
	inst.group_enter_requested.connect(_on_deck_renderer_group_enter_requested)
	inst.dirty_state_changed.connect(_on_deck_renderer_dirty_state_changed.bind(inst))
	add_recent_file(path)
	recent_path = path.get_base_dir()
	RendererPersistence.set_value(PERSISTENCE_NAMESPACE, "config", "recent_path", recent_path)
	tab_container.set_current_tab(tab)
	bottom_dock.variable_viewer.enable_new_button()


## Returns the current deck in the [member tab_container].
func get_active_deck() -> Deck:
	return get_deck_at_tab(tab_container.get_current_tab())


## Returns the deck at [param tab] in the [member tab_container].
func get_deck_at_tab(tab: int) -> Deck:
	if tab_container.is_empty():
		return null
	
	return (tab_container.get_content(tab) as DeckRendererGraphEdit).deck


## Saves the active [Deck] in [member tab_container]
func save_active_deck() -> void:
	save_tab(tab_container.get_current_tab())


func save_tab(tab: int) -> void:
	if tab_container.get_tab_metadata(tab, "group"):
		return

	var renderer := tab_container.get_content(tab) as DeckRendererGraphEdit
	var deck := renderer.deck
	if deck.save_path.is_empty():
		open_save_dialog("res://")
	else:
		var json := JSON.stringify(deck.to_dict(), "\t")
		var f := FileAccess.open(deck.save_path, FileAccess.WRITE)
		f.store_string(json)
		add_recent_file(deck.save_path)
		renderer.dirty = false


## Disconnects the [FileDialog] signals if they are already connected.
func disconnect_file_dialog_signals() -> void:
	if file_dialog.file_selected.is_connected(_on_file_dialog_save_file):
		file_dialog.file_selected.disconnect(_on_file_dialog_save_file)

	if file_dialog.files_selected.is_connected(_on_file_dialog_open_files):
		file_dialog.files_selected.disconnect(_on_file_dialog_open_files)

## Connected to [signal DeckRenderGraphEdit.group_entered_request] to allow entering
## groups based off the given [param group_id] and [param deck].  As well as adding
## a corresponding tab to [member tab_container]
func _on_deck_renderer_group_enter_requested(group_id: String) -> void:
	#var group_deck := deck.get_group(group_id)
	for tab in tab_container.get_tab_count():
		if tab_container.get_tab_metadata(tab, "id") == group_id:
			tab_container.set_current_tab(tab)
			return
	var group_deck := DeckHolder.get_deck(group_id)
	var deck_renderer: DeckRendererGraphEdit = DECK_SCENE.instantiate()
	deck_renderer.deck = group_deck
	deck_renderer.initialize_from_deck()
	var tab := tab_container.add_content(deck_renderer, "(g) %s" % group_id.left(8))
	tab_container.set_tab_metadata(tab, "id", group_id)
	tab_container.set_tab_metadata(tab, "group", true)
	deck_renderer.group_enter_requested.connect(_on_deck_renderer_group_enter_requested)
	tab_container.set_current_tab(tab)


func _on_connections_id_pressed(id: int) -> void:
	match id:
		ConnectionsMenuId.OBS:
			obs_setup_dialog.popup_centered()
		ConnectionsMenuId.TWITCH:
			twitch_setup_dialog.popup_centered()


func _on_obs_websocket_setup_dialog_connect_button_pressed(state: OBSWebsocketSetupDialog.ConnectionState) -> void:
	match state:
		OBSWebsocketSetupDialog.ConnectionState.DISCONNECTED:
			obs_setup_dialog.set_button_state(OBSWebsocketSetupDialog.ConnectionState.CONNECTING)
			no_obsws.connect_to_obsws(obs_setup_dialog.get_port(), obs_setup_dialog.get_password())
			await no_obsws.connection_ready
			obs_setup_dialog.set_button_state(OBSWebsocketSetupDialog.ConnectionState.CONNECTED)


func _process(delta: float) -> void:
	DeckHolder.send_event(&"process", {"delta": delta})


func _on_debug_id_pressed(id: int) -> void:
	match id:
		DebugMenuId.DECKS:
			var d := AcceptDialog.new()
			var debug_decks: DebugDecksList = DEBUG_DECKS_LIST.instantiate()
			d.add_child(debug_decks)
			d.canceled.connect(d.queue_free)
			d.confirmed.connect(d.queue_free)
			debug_decks.item_pressed.connect(_on_debug_decks_viewer_item_pressed)
			add_child(d)
			d.popup_centered()
		DebugMenuId.EMBED_SUBWINDOWS:
			var c := debug_popup_menu.is_item_checked(id)
			debug_popup_menu.set_item_checked(id, !c)
			get_tree().get_root().gui_embed_subwindows = !c
			RendererPersistence.set_value(PERSISTENCE_NAMESPACE, "config", "embed_subwindows", !c)
			file_dialog.use_native_dialog = c


func _on_debug_decks_viewer_item_pressed(deck_id: String, instance_id: String) -> void:
	if instance_id == "":
		var deck := DeckHolder.get_deck(deck_id)
		var inst: DeckRendererGraphEdit = DECK_SCENE.instantiate()
		inst.deck = deck
		var tab := tab_container.add_content(inst, "<Deck %s>" % [deck_id.left(8)])
		tab_container.set_tab_metadata(tab, "id", deck.id)
		inst.initialize_from_deck()
		inst.group_enter_requested.connect(_on_deck_renderer_group_enter_requested)
		tab_container.set_current_tab(tab)
	else:
		var deck := DeckHolder.get_group_instance(deck_id, instance_id)
		var inst: DeckRendererGraphEdit = DECK_SCENE.instantiate()
		inst.deck = deck
		var tab := tab_container.add_content(inst, "<Group %s::%s>" % [deck_id.left(8), instance_id.left(8)])
		tab_container.set_tab_metadata(tab, "id", deck.id)
		inst.initialize_from_deck()
		inst.group_enter_requested.connect(_on_deck_renderer_group_enter_requested)
		tab_container.set_current_tab(tab)


func _on_deck_renderer_dirty_state_changed(renderer: DeckRendererGraphEdit) -> void:
	var idx: int = range(tab_container.get_tab_count()).filter(
		func(x: int):
			return tab_container.get_content(x) == renderer
	)[0]
	var title := tab_container.get_tab_title(idx).trim_suffix("(*)")
	if renderer.dirty:
		tab_container.set_tab_title(idx, "%s(*)" % title)
	else:
		tab_container.set_tab_title(idx, title.trim_suffix("(*)"))
	tab_container.set_tab_metadata(idx, "dirty", renderer.dirty)


func add_recent_file(path: String) -> void:
	var item := recent_files.find(path)
	if item == -1:
		recent_files.push_front(path)
	else:
		recent_files.push_front(recent_files.pop_at(item))
	recent_files = recent_files.slice(0, max_recents)
	
	add_recents_to_menu()


func add_recents_to_menu() -> void:
	if recent_files.is_empty():
		return
		
	if file_popup_menu.get_item_count() > FileMenuId.RECENTS + 1:
		var end := file_popup_menu.get_item_count() - FileMenuId.RECENTS - 1
		for i in end:
			file_popup_menu.remove_item(file_popup_menu.get_item_count() - 1)
	
	var reduce_length := recent_files.any(func(x: String): return x.length() > 35)
	
	for i in recent_files.size():
		var file = recent_files[i] as String
		if reduce_length:
			# shorten the basepath to be the first letter of all folders
			var base: String = Array(
				file.get_base_dir().split("/", false)
				).reduce(
					func(a: String, s: String):
						return a + s[0] + "/",
				"/")
			var filename := file.get_file()
			file = base.path_join(filename)
		
		file_popup_menu.add_item(file)
		var s := Shortcut.new()
		var k := InputEventKey.new()
		k.keycode = KEY_1 + i
		k.ctrl_pressed = true
		s.events.append(k)
		file_popup_menu.set_item_shortcut(file_popup_menu.get_item_count() - 1, s)
		
	RendererPersistence.set_value(PERSISTENCE_NAMESPACE, "config", "recent_files", recent_files)


func _notification(what: int) -> void:
	if what == NOTIFICATION_WM_CLOSE_REQUEST:
		RendererPersistence.commit(PERSISTENCE_NAMESPACE)
		
		if range(tab_container.get_tab_count()).any(func(x: int): return tab_container.get_content(x).dirty):
			unsaved_changes_dialog.show()
		else:
			#for i in tab_container.get_tab_count():
				#close_tab(i)
			for i in range(tab_container.get_tab_count() - 1, -1, -1):
				await close_tab(i)

			get_tree().quit()


func _on_unsaved_changes_dialog_single_deck_confirmed() -> void:
	save_tab(unsaved_changes_dialog_single_deck.get_meta("tab"))
	await close_tab(unsaved_changes_dialog_single_deck.get_meta("tab"))


func _on_unsaved_changes_dialog_single_deck_custom_action(action: StringName) -> void:
	if action == &"force_close":
		await close_tab(unsaved_changes_dialog_single_deck.get_meta("tab"))
		unsaved_changes_dialog_single_deck.hide()


func _on_unsaved_changes_dialog_confirmed() -> void:
	for i in range(tab_container.get_tab_count() - 1, -1, -1):
		await close_tab(i)
	get_tree().quit()


func _unhandled_input(event: InputEvent) -> void:
	if event.is_action_pressed("toggle_bottom_dock"):
		bottom_dock.visible = !bottom_dock.visible
		accept_event()


func _on_help_id_pressed(id: int) -> void:
	match id:
		HelpMenuId.ABOUT:
			about_dialog.show()
		HelpMenuId.DOCS:
			OS.shell_open("https://codeberg.org/Eroax/StreamGraph/wiki")