class_name RankedProfileState
extends RefCounted

# Read-only server projection. The client deliberately stores no tier bands
# or rating formula: it displays the backend's committed view verbatim after
# validating the shape and numeric safety of the response.

var available := false
var rating := 0.0
var rd := 0.0
var volatility := 0.0
var ranked_games := 0
var tier := ""
var provisional := false
var season_id := ""
var error_message := ""


func apply(payload: Dictionary) -> bool:
	var required := ["rating", "rd", "volatility", "ranked_games", "tier", "provisional"]
	for key in required:
		if not payload.has(key):
			return _reject("Profile response is missing " + key)
	if not (payload["rating"] is int or payload["rating"] is float) or not (payload["rd"] is int or payload["rd"] is float) or not (payload["volatility"] is int or payload["volatility"] is float) or not (payload["ranked_games"] is int or payload["ranked_games"] is float) or not payload["tier"] is String or not payload["provisional"] is bool:
		return _reject("Profile response contains invalid types")
	var next_rating := float(payload["rating"])
	var next_rd := float(payload["rd"])
	var next_volatility := float(payload["volatility"])
	var next_games := int(payload["ranked_games"])
	var next_tier := String(payload["tier"])
	if not is_finite(next_rating) or not is_finite(next_rd) or not is_finite(next_volatility) or next_rating < 0.0 or next_rd < 0.0 or next_volatility < 0.0 or next_games < 0 or next_tier.is_empty():
		return _reject("Profile response contains invalid values")
	rating = next_rating
	rd = next_rd
	volatility = next_volatility
	ranked_games = next_games
	tier = next_tier
	provisional = bool(payload["provisional"])
	season_id = String(payload.get("season_id", ""))
	available = true
	error_message = ""
	return true


func set_error(reason: String) -> void:
	available = false
	error_message = reason


func display_text() -> String:
	if not available:
		return error_message if not error_message.is_empty() else "Ranked profile unavailable"
	var status := "Provisional" if provisional else tier
	return "%s · %d ranked game%s" % [status, ranked_games, "" if ranked_games == 1 else "s"]


func _reject(reason: String) -> bool:
	available = false
	error_message = reason
	return false