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 season_ends_at_unix := 0
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 not _valid_nonnegative_integer(payload["ranked_games"]) or next_rating < 0.0 or next_rd < 0.0 or next_volatility < 0.0 or next_games < 0 or not _valid_tier(next_tier):
		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 = ""
	if payload.has("season_id"):
		if not payload["season_id"] is String or not is_valid_opaque_id(String(payload["season_id"])):
			return _reject("Profile response contains invalid season identifier")
		season_id = String(payload["season_id"])
	season_ends_at_unix = 0
	if payload.has("season_ends_at"):
		if not payload["season_ends_at"] is String or not is_valid_season_timestamp(String(payload["season_ends_at"])):
			return _reject("Profile response contains invalid season expiry")
		var parsed_season_end := Time.get_unix_time_from_datetime_string(String(payload["season_ends_at"]))
		if parsed_season_end < 0:
			return _reject("Profile response contains invalid season expiry")
		season_ends_at_unix = int(parsed_season_end)
	available = true
	error_message = ""
	return true


static func is_valid_season_timestamp(value: String) -> bool:
	if value.is_empty():
		return false
	var timestamp_pattern := RegEx.create_from_string("^\\d{4}-\\d{2}-\\d{2}T\\d{2}:\\d{2}:\\d{2}(?:\\.\\d+)?(?:Z|[+-]\\d{2}:\\d{2})$")
	return timestamp_pattern.search(value) != null


static func is_valid_opaque_id(value: String) -> bool:
	if value.length() < 16 or value.length() > 128:
		return false
	var id_pattern := RegEx.create_from_string("^[A-Za-z0-9_-]+$")
	return id_pattern.search(value) != null


static func _valid_nonnegative_integer(value: Variant) -> bool:
	if value is int:
		return int(value) >= 0
	if value is float:
		return is_finite(float(value)) and float(value) >= 0.0 and float(value) == floor(float(value))
	return false


static func _valid_tier(value: String) -> bool:
	return value in ["PROVISIONAL", "BRONZE", "SILVER", "GOLD", "PLATINUM", "DIAMOND"]


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


func display_text(now_unix: int = -1) -> String:
	if not available:
		return error_message if not error_message.is_empty() else "Ranked profile unavailable"
	var status := "Provisional" if provisional else tier
	var text := "%s · %d ranked game%s" % [status, ranked_games, "" if ranked_games == 1 else "s"]
	if season_ends_at_unix > 0:
		var current_unix := int(Time.get_unix_time_from_system()) if now_unix < 0 else now_unix
		var remaining_days := maxi(0, int(ceil(float(season_ends_at_unix - current_unix) / 86400.0)))
		text += " · Season ends in %dd" % remaining_days
	return text


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