import { mkdirSync, readFileSync } from "node:fs";
import { resolve } from "node:path";
import "dotenv/config";

function required(name: string): string {
  const v = process.env[name];
  if (!v) {
    console.error(`missing env var: ${name}`);
    process.exit(1);
  }
  return v;
}

export const config = {
  port: Number(process.env.NIGHTSHADE_PORT ?? 8787),
  dataDir: resolve(process.env.NIGHTSHADE_DATA_DIR ?? "./data"),
  publicUrl: process.env.NIGHTSHADE_PUBLIC_URL?.replace(/\/$/, "") ?? null,
  miniflux: {
    url: required("MINIFLUX_URL"),
    token:
      process.env.MINIFLUX_TOKEN ??
      (process.env.MINIFLUX_TOKEN_FILE
        ? readTokenFile(process.env.MINIFLUX_TOKEN_FILE)
        : ""),
  },
  allowedDids: new Set(
    (process.env.NIGHTSHADE_ALLOWED_DIDS ?? "")
      .split(",")
      .map((s) => s.trim())
      .filter(Boolean),
  ),
};

if (!config.miniflux.token) {
  console.error("missing MINIFLUX_TOKEN or MINIFLUX_TOKEN_FILE");
  process.exit(1);
}

mkdirSync(config.dataDir, { recursive: true });

function readTokenFile(path: string): string {
  return readFileSync(path, "utf8").trim();
}

export function isLoopback(): boolean {
  return config.publicUrl === null;
}

export function publicBase(): string {
  return config.publicUrl ?? `http://127.0.0.1:${config.port}`;
}

export function minifluxAllowed(did: string): boolean {
  return config.allowedDids.size === 0 || config.allowedDids.has(did);
}