config.ts

import { readFileSync } from "fs";
import { z } from "zod";

const configSchema = z.object({
  adapter: z.string(),
  credentials: z.record(z.string()),
  student_id: z.string(),
  sync_cron: z.string().default("*/30 * * * *"),
  llm: z.object({
    base_url: z.string().default("http://localhost:1234/v1"),
    model: z.string().default("qwen2.5-32b"),
    api_key: z.string().default("not-needed"),
  }),
  alerts: z
    .object({
      telegram_token: z.string(),
      chat_id: z.string(),
    })
    .optional(),
  thresholds: z
    .object({
      warn_below: z.number().default(3.5),
      alert_below: z.number().default(3),
    })
    .default({}),
});

export type Config = z.infer<typeof configSchema>;

let _config: Config | null = null;

export function loadConfig(path = "./config.json"): Config {
  if (_config) return _config;
  const raw = JSON.parse(readFileSync(path, "utf-8"));
  _config = configSchema.parse(raw);
  return _config;
}