extends Control
## Boot screen that handles update checking before launching the game
## Shows changelog with pagination, checking patch, and resource loading

@onready var status_label := %StatusLabel as Label
@onready var progress_bar := %ProgressBar as ProgressBar
@onready var progress_label := %ProgressLabel as Label
@onready var button_container := %ButtonContainer as HBoxContainer
@onready var update_button := %UpdateButton as BaseButton
@onready var update_button_label := %UpdateButton.get_node("Label") as Label
@onready var skip_button := %SkipButton as BaseButton
@onready var skip_button_label := %SkipButton.get_node("Label") as Label

@onready var changelog_panel := %ChangelogPanel
@onready var changelog_richtext := %ChangelogRichText as RichTextLabel
@onready var prev_button := %PrevButton as BaseButton
@onready var next_button := %NextButton as BaseButton
@onready var page_label := %PageLabel as Label

var update_manager: Node
var update_info: Dictionary = {}
var main_scene_path := "res://scenes/ui/login_screen.tscn"

# Changelog Pagination
var changelog_data: Array = []
var current_page: int = 0
var is_loading_game: bool = false

func _ready() -> void:
	update_manager = _get_update_manager()
	
	update_manager.update_check_completed.connect(_on_update_check_completed)
	update_manager.update_check_failed.connect(_on_update_check_failed)
	update_manager.download_started.connect(_on_download_started)
	update_manager.download_progress.connect(_on_download_progress)
	update_manager.download_completed.connect(_on_download_completed)
	update_manager.download_failed.connect(_on_download_failed)
	
	update_button.pressed.connect(_on_update_pressed)
	skip_button.pressed.connect(_begin_resource_load)
	prev_button.pressed.connect(_on_prev_pressed)
	next_button.pressed.connect(_on_next_pressed)
	
	changelog_panel.visible = false
	button_container.visible = false
	progress_bar.visible = false
	progress_label.visible = false
	
	status_label.text = "Checking versions..."
	
	# Let the GameUpdateManager handle Editor mode (it will use the local version.json)
	update_manager.check_for_updates()

func _get_update_manager() -> Node:
	if has_node("/root/GameUpdateManager"):
		return get_node("/root/GameUpdateManager")
	var manager_script := load("res://scripts/managers/game_update_manager.gd")
	var manager: Node = manager_script.new()
	manager.name = "GameUpdateManager"
	get_tree().root.add_child(manager)
	return manager

func _on_update_check_completed(has_update: bool, info: Dictionary) -> void:
	update_info = info
	
	# Load changelog array specifically
	changelog_data = update_manager.manifest_data.get("releases", [])
	if changelog_data.size() > 0:
		changelog_panel.visible = true
		current_page = 0
		_update_pagination_ui()
	
	if has_update and info.can_patch:
		status_label.text = "Update Available: v" + info.latest_version
		button_container.visible = true
		update_button.visible = true
		skip_button.visible = true
		skip_button_label.text = "Force Play"
	else:
		status_label.text = "Game up to date."
		button_container.visible = true
		update_button.visible = false
		skip_button.visible = true
		skip_button_label.text = "Play"

func _on_update_check_failed(_error: String) -> void:
	status_label.text = "Could not check for updates"
	button_container.visible = true
	update_button.visible = false
	skip_button.visible = true
	skip_button_label.text = "Play"

func _on_update_pressed() -> void:
	button_container.visible = false
	status_label.text = "Downloading update..."
	update_manager.download_update()

func _on_download_started(total_size: int) -> void:
	progress_bar.visible = true
	progress_label.visible = true
	progress_bar.value = 0
	progress_label.text = "0%"

func _on_download_progress(_downloaded: int, _total: int, percentage: float) -> void:
	progress_bar.value = percentage
	progress_label.text = "%.0f%%" % percentage

func _on_download_completed() -> void:
	status_label.text = "Update installed successfully!"
	progress_bar.visible = false
	progress_label.visible = false
	_begin_resource_load()

func _on_download_failed(error: String) -> void:
	status_label.text = "Update failed: " + error
	progress_bar.visible = false
	progress_label.visible = false
	button_container.visible = true
	update_button_label.text = "Retry"

func _begin_resource_load() -> void:
	button_container.visible = false
	status_label.text = "Loading resources..."
	progress_bar.visible = true
	progress_label.visible = true
	progress_bar.value = 0
	progress_label.text = "0%"
	
	is_loading_game = true
	ResourceLoader.load_threaded_request(main_scene_path)

func _process(_delta: float) -> void:
	if is_loading_game:
		var progress := []
		var status := ResourceLoader.load_threaded_get_status(main_scene_path, progress)
		
		if status == ResourceLoader.THREAD_LOAD_IN_PROGRESS:
			var perc = progress[0] * 100.0
			progress_bar.value = perc
			progress_label.text = "%.0f%%" % perc
		elif status == ResourceLoader.THREAD_LOAD_LOADED:
			is_loading_game = false
			get_tree().change_scene_to_packed(ResourceLoader.load_threaded_get(main_scene_path))
		elif status == ResourceLoader.THREAD_LOAD_FAILED:
			is_loading_game = false
			status_label.text = "Error Loading Game"

# --- Pagination UI Functions ---
func _update_pagination_ui():
	if changelog_data.size() == 0:
		changelog_richtext.text = "No changelog data available."
		prev_button.disabled = true
		next_button.disabled = true
		page_label.text = "0/0"
		return
		
	var entry: Dictionary = changelog_data[current_page]
	var txt: String = "[font_size=20][b]Version " + str(entry.get("version", "Unknown")) + "[/b][/font_size]\n[color=gray]" + str(entry.get("date", "")) + "[/color]\n\n"
	
	var changes: Array = entry.get("changelog", [])
	txt += "[table=2]"
	for change in changes:
		txt += "[cell]• [/cell][cell]" + change + "[/cell]"
	txt += "[/table]"
			
	changelog_richtext.text = txt
	
	page_label.text = str(current_page + 1) + " / " + str(changelog_data.size())
	prev_button.disabled = (current_page == 0)
	next_button.disabled = (current_page >= changelog_data.size() - 1)

func _on_prev_pressed():
	if current_page > 0:
		current_page -= 1
		_update_pagination_ui()

func _on_next_pressed():
	if current_page < changelog_data.size() - 1:
		current_page += 1
		_update_pagination_ui()