const KEY_SPLIT_RE = /[\s,;]+/g;

function parseKeyList(raw?: string | null): string[] {
  if (!raw) return [];
  return raw
    .split(KEY_SPLIT_RE)
    .map((value) => value.trim())
    .filter(Boolean);
}

function collectEnvPrefixedKeys(prefix: string): string[] {
  const keys: string[] = [];
  for (const [name, value] of Object.entries(process.env)) {
    if (!name.startsWith(prefix)) continue;
    const trimmed = value?.trim();
    if (!trimmed) continue;
    keys.push(trimmed);
  }
  return keys;
}

export function collectAnthropicApiKeys(): string[] {
  const forcedSingle = process.env.CLAWDBOT_LIVE_ANTHROPIC_KEY?.trim();
  if (forcedSingle) return [forcedSingle];

  const fromList = parseKeyList(process.env.CLAWDBOT_LIVE_ANTHROPIC_KEYS);
  const fromEnv = collectEnvPrefixedKeys("ANTHROPIC_API_KEY");
  const primary = process.env.ANTHROPIC_API_KEY?.trim();

  const seen = new Set<string>();
  const add = (value?: string) => {
    if (!value) return;
    if (seen.has(value)) return;
    seen.add(value);
  };

  for (const value of fromList) add(value);
  if (primary) add(primary);
  for (const value of fromEnv) add(value);

  return Array.from(seen);
}

export function isAnthropicRateLimitError(message: string): boolean {
  const lower = message.toLowerCase();
  if (lower.includes("rate_limit")) return true;
  if (lower.includes("rate limit")) return true;
  if (lower.includes("429")) return true;
  return false;
}

export function isAnthropicBillingError(message: string): boolean {
  const lower = message.toLowerCase();
  if (lower.includes("credit balance")) return true;
  if (lower.includes("insufficient credit")) return true;
  if (lower.includes("insufficient credits")) return true;
  if (lower.includes("payment required")) return true;
  if (lower.includes("billing") && lower.includes("disabled")) return true;
  if (lower.includes("402")) return true;
  return false;
}