export type RuntimeInfo = {
  target: "huggingface-space" | "local";
  provider: string;
  stage: string;
  label: string;
  proEnabled: boolean;
  spaceId: string | null;
  hardware: string | null;
  storage: string | null;
  sleepTimeMinutes: number | null;
  devMode: boolean;
};

function readEnv(...keys: string[]): string | null {
  for (const key of keys) {
    const value = process.env[key];
    if (value && value.trim().length > 0) {
      return value.trim();
    }
  }

  return null;
}

function parseOptionalInt(value: string | null): number | null {
  if (!value) {
    return null;
  }

  const parsed = Number.parseInt(value, 10);
  return Number.isFinite(parsed) ? parsed : null;
}

export function resolveRuntimeInfo(): RuntimeInfo {
  const targetEnv = readEnv("RUNTIME_TARGET", "NEXT_PUBLIC_RUNTIME_TARGET");
  const spaceId = readEnv("SPACE_ID", "HF_SPACE_REPO_ID", "NEXT_PUBLIC_HF_SPACE_ID");
  const stage = readEnv("SPACE_STAGE", "NEXT_PUBLIC_SPACE_STAGE") ?? "LOCAL";
  const hardware = readEnv("SPACE_HARDWARE", "NEXT_PUBLIC_HF_HARDWARE");
  const storage = readEnv("SPACE_STORAGE", "NEXT_PUBLIC_HF_STORAGE");
  const sleepTime = parseOptionalInt(
    readEnv("SPACE_SLEEP_TIME", "NEXT_PUBLIC_HF_SLEEP_TIME"),
  );
  const provider =
    readEnv("SPACE_PROVIDER", "NEXT_PUBLIC_SPACE_PROVIDER") ??
    (spaceId || targetEnv === "huggingface"
      ? "Hugging Face Spaces"
      : "Local workspace");
  const target =
    targetEnv === "huggingface" || spaceId ? "huggingface-space" : "local";

  return {
    target,
    provider,
    stage,
    label: target === "huggingface-space" ? "Space ativo" : "Execucao local",
    proEnabled: readEnv("HF_PRO_ENABLED", "NEXT_PUBLIC_HF_PRO_ENABLED") === "true",
    spaceId,
    hardware,
    storage,
    sleepTimeMinutes: sleepTime,
    devMode: readEnv("HF_DEV_MODE", "NEXT_PUBLIC_HF_DEV_MODE") === "true",
  };
}