const parseInteger = (value: string | undefined, fallback: number) => {
  if (!value) return fallback;
  const parsed = Number.parseInt(value, 10);
  return Number.isFinite(parsed) ? parsed : fallback;
};

const parseBoolean = (value: string | undefined, fallback: boolean) => {
  if (value == null || value === "") return fallback;
  return value === "1" || value.toLowerCase() === "true";
};

const parseList = (value: string | undefined) =>
  (value ?? "")
    .split(",")
    .map((item) => item.trim())
    .filter(Boolean);

export const ENV = {
  appId: process.env.VITE_APP_ID ?? "",
  appPublicBaseUrl: process.env.APP_PUBLIC_BASE_URL ?? "",
  cookieSecret: process.env.JWT_SECRET ?? "",
  databaseUrl: process.env.DATABASE_URL ?? "",
  registrationInviteCode: process.env.REGISTRATION_INVITE_CODE ?? "CA2026",
  oAuthServerUrl: process.env.OAUTH_SERVER_URL ?? "",
  ownerOpenId: process.env.OWNER_OPEN_ID ?? "",
  adminUsernames: parseList(process.env.ADMIN_USERNAMES),
  isProduction: process.env.NODE_ENV === "production",
  forgeApiUrl: process.env.BUILT_IN_FORGE_API_URL ?? "",
  forgeApiKey: process.env.BUILT_IN_FORGE_API_KEY ?? "",
  localStorageDir: process.env.LOCAL_STORAGE_DIR ?? "./data/storage",
  llmApiUrl:
    process.env.LLM_API_URL ??
    (process.env.BUILT_IN_FORGE_API_URL
      ? `${process.env.BUILT_IN_FORGE_API_URL.replace(/\/$/, "")}/v1/chat/completions`
      : ""),
  llmApiKey:
    process.env.LLM_API_KEY ?? process.env.BUILT_IN_FORGE_API_KEY ?? "",
  llmModel: process.env.LLM_MODEL ?? "gemini-2.5-flash",
  llmVisionApiUrl:
    process.env.LLM_VISION_API_URL ??
    process.env.LLM_API_URL ??
    (process.env.BUILT_IN_FORGE_API_URL
      ? `${process.env.BUILT_IN_FORGE_API_URL.replace(/\/$/, "")}/v1/chat/completions`
      : ""),
  llmVisionApiKey:
    process.env.LLM_VISION_API_KEY ??
    process.env.LLM_API_KEY ??
    process.env.BUILT_IN_FORGE_API_KEY ??
    "",
  llmVisionModel: process.env.LLM_VISION_MODEL ?? process.env.LLM_MODEL ?? "gemini-2.5-flash",
  llmMaxTokens: parseInteger(process.env.LLM_MAX_TOKENS, 32768),
  llmEnableThinking: parseBoolean(process.env.LLM_ENABLE_THINKING, false),
  llmThinkingBudget: parseInteger(process.env.LLM_THINKING_BUDGET, 128),
  llmTimeoutMs: parseInteger(process.env.LLM_TIMEOUT_MS, 45000),
  llmRetryCount: parseInteger(process.env.LLM_RETRY_COUNT, 1),
  mediaServiceUrl: process.env.MEDIA_SERVICE_URL ?? "",
  mediaFetchTimeoutMs: parseInteger(process.env.MEDIA_FETCH_TIMEOUT_MS, 12000),
  mediaFetchRetryCount: parseInteger(process.env.MEDIA_FETCH_RETRY_COUNT, 2),
  youtubeApiKey: process.env.YOUTUBE_API_KEY ?? "",
  backgroundTaskPollMs: parseInteger(process.env.BACKGROUND_TASK_POLL_MS, 3000),
  backgroundTaskStaleMs: parseInteger(process.env.BACKGROUND_TASK_STALE_MS, 300000),
  backgroundTaskHeartbeatMs: parseInteger(process.env.BACKGROUND_TASK_HEARTBEAT_MS, 5000),
};