extends PanelContainer

signal closed

@onready var close_btn := %CloseBtn as Button
@onready var sort_score_btn := %SortScoreBtn as Button
@onready var sort_win_rate_btn := %SortWinRateBtn as Button
@onready var sort_games_btn := %SortGamesBtn as Button
@onready var leaderboard_list := %LeaderboardList as VBoxContainer
@onready var status_label := %StatusLabel as Label

var leaderboard_data: Array = []
var current_sort_key: String = "high_score"

func _ready() -> void:
	close_btn.pressed.connect(_on_close_pressed)
	sort_score_btn.pressed.connect(func(): _sort_by("high_score"))
	sort_win_rate_btn.pressed.connect(func(): _sort_by("win_rate"))
	sort_games_btn.pressed.connect(func(): _sort_by("games_played"))
	
	_update_tab_visuals()

func show_panel() -> void:
	show()
	_fetch_leaderboard_data()

func _on_close_pressed() -> void:
	hide()
	emit_signal("closed")

func _fetch_leaderboard_data() -> void:
	if not NakamaManager.session:
		status_label.text = "Not connected to Nakama"
		return
		
	status_label.text = "Loading data..."
	
	# Clear existing items
	for child in leaderboard_list.get_children():
		child.queue_free()
		
	var payload = JSON.stringify({})
	var result = await NakamaManager.client.rpc_async(NakamaManager.session, "get_leaderboard_stats", payload)
	
	if result.is_exception():
		status_label.text = "Failed to load leaderboard"
		push_error("[Leaderboard] RPC failed: ", result.get_exception().message)
		return
		
	var response_text = result.payload
	var json = JSON.new()
	var error = json.parse(response_text)
	
	if error == OK:
		var data = json.get_data()
		if data.has("leaderboard"):
			leaderboard_data = data.leaderboard
			_calculate_win_rates()
			status_label.text = ""
			_sort_by(current_sort_key)
		else:
			status_label.text = "No data found"
	else:
		status_label.text = "Error parsing data"

func _calculate_win_rates() -> void:
	for entry in leaderboard_data:
		var played = entry.get("games_played", 0)
		var won = entry.get("games_won", 0)
		if played > 0:
			entry["win_rate"] = float(won) / float(played) * 100.0
		else:
			entry["win_rate"] = 0.0

func _sort_by(key: String) -> void:
	current_sort_key = key
	_update_tab_visuals()
	
	leaderboard_data.sort_custom(func(a, b): return a.get(key, 0) > b.get(key, 0))
	
	_populate_list()

func _update_tab_visuals() -> void:
	var color_active = Color(0.647, 0.996, 0.224, 1)
	var color_inactive = Color(0.69, 0.529, 0.357, 1)
	
	sort_score_btn.add_theme_color_override("font_color", color_active if current_sort_key == "high_score" else color_inactive)
	sort_win_rate_btn.add_theme_color_override("font_color", color_active if current_sort_key == "win_rate" else color_inactive)
	sort_games_btn.add_theme_color_override("font_color", color_active if current_sort_key == "games_played" else color_inactive)

func _populate_list() -> void:
	for child in leaderboard_list.get_children():
		child.queue_free()
		
	if leaderboard_data.size() == 0:
		status_label.text = "No players found"
		return
		
	for i in range(leaderboard_data.size()):
		var entry = leaderboard_data[i]
		_create_leaderboard_item(i + 1, entry)

func _create_leaderboard_item(rank: int, entry: Dictionary) -> void:
	var item = PanelContainer.new()
	var style = StyleBoxFlat.new()
	style.bg_color = Color(0.15, 0.15, 0.15, 1.0)
	if rank <= 3:
		style.bg_color = Color(0.2, 0.2, 0.15, 1.0) # Slightly highlight top 3
	style.set_corner_radius_all(4)
	style.content_margin_left = 10
	style.content_margin_right = 10
	style.content_margin_top = 8
	style.content_margin_bottom = 8
	item.add_theme_stylebox_override("panel", style)
	
	var hbox = HBoxContainer.new()
	hbox.theme_override_constants.separation = 16
	item.add_child(hbox)
	
	# Rank
	var rank_label = Label.new()
	rank_label.text = "#" + str(rank)
	rank_label.custom_minimum_size = Vector2(40, 0)
	
	if rank == 1:
		rank_label.add_theme_color_override("font_color", Color.GOLD)
	elif rank == 2:
		rank_label.add_theme_color_override("font_color", Color.SILVER)
	elif rank == 3:
		rank_label.add_theme_color_override("font_color", Color.DARK_ORANGE)
	else:
		rank_label.add_theme_color_override("font_color", Color.LIGHT_GRAY)
	
	hbox.add_child(rank_label)
	
	# Avatar
	var avatar_rect = TextureRect.new()
	avatar_rect.custom_minimum_size = Vector2(32, 32)
	avatar_rect.expand_mode = TextureRect.EXPAND_IGNORE_SIZE
	var avatar_url = entry.get("avatar_url", UserProfileManager.AVATARS[0])
	if avatar_url.is_empty() or not ResourceLoader.exists(avatar_url):
		avatar_url = UserProfileManager.AVATARS[0]
	avatar_rect.texture = load(avatar_url)
	hbox.add_child(avatar_rect)
	
	# Name
	var name_label = Label.new()
	name_label.text = entry.get("display_name", "Unknown")
	name_label.size_flags_horizontal = Control.SIZE_EXPAND_FILL
	name_label.add_theme_color_override("font_color", Color.WHITE)
	hbox.add_child(name_label)
	
	# Value based on current sort
	var value_label = Label.new()
	var color = Color(0.647, 0.996, 0.224, 1) # TEKTON green
	
	match current_sort_key:
		"high_score":
			value_label.text = str(entry.get("high_score", 0))
		"win_rate":
			value_label.text = "%.1f%%" % entry.get("win_rate", 0.0)
		"games_played":
			value_label.text = str(entry.get("games_played", 0))
			
	value_label.add_theme_color_override("font_color", color)
	value_label.horizontal_alignment = HORIZONTAL_ALIGNMENT_RIGHT
	value_label.custom_minimum_size = Vector2(80, 0)
	hbox.add_child(value_label)
	
	leaderboard_list.add_child(item)