export const DEFAULT_START_BALANCE = 1500;

const CODE_CHARS = "ABCDEFGHJKLMNPQRSTUVWXYZ23456789";

export function createId(): string {
  return crypto.randomUUID();
}

export function createSessionCode(existing: Set<string>): string {
  for (let i = 0; i < 1000; i += 1) {
    let code = "";
    for (let j = 0; j < 5; j += 1) {
      code += CODE_CHARS[Math.floor(Math.random() * CODE_CHARS.length)];
    }
    if (!existing.has(code)) {
      return code;
    }
  }
  throw new Error("Unable to allocate session code");
}

export function now(): number {
  return Date.now();
}

export function parseAmount(value: unknown): number | null {
  if (typeof value === "number" && Number.isFinite(value)) {
    return value;
  }
  if (typeof value === "string") {
    const parsed = Number.parseFloat(value);
    if (Number.isFinite(parsed)) {
      return parsed;
    }
  }
  return null;
}

export function clampBalance(value: number): number {
  return Math.round(value * 100) / 100;
}