import { execFileSync } from "node:child_process";

export function isFetchEnabled(): boolean {
  const fetchEnabled = (process.env.RTFD_FETCH ?? "true").toLowerCase();
  return !["false", "0", "no"].includes(fetchEnabled);
}

export function getCacheConfig(): [boolean, number] {
  const enabled = !["false", "0", "no"].includes((process.env.RTFD_CACHE_ENABLED ?? "true").toLowerCase());

  const rawTtl = process.env.RTFD_CACHE_TTL ?? "604800";
  const ttl = Number.parseFloat(rawTtl);
  return [enabled, Number.isFinite(ttl) ? ttl : 604800];
}

export function getGithubToken(): string | null {
  const authMethod = (process.env.GITHUB_AUTH ?? "token").toLowerCase();

  if (authMethod === "disabled") {
    return null;
  }

  if (authMethod === "token" || authMethod === "auto") {
    const token = process.env.GITHUB_TOKEN;
    if (token) {
      return token;
    }

    if (authMethod === "token") {
      console.warn("GitHub token not found in environment");
      return null;
    }
  }

  if (authMethod === "cli" || authMethod === "auto") {
    try {
      const output = execFileSync("gh", ["auth", "token"], { encoding: "utf8" }).trim();
      if (output) {
        return output;
      }
    } catch {
      // fall through to the error below
    }
  }

  console.warn("GitHub token not found via configured methods");
  return null;
}