import { assertEquals } from "typescript-is";
import toml from "toml"
import { readFileSync } from "fs";
import chalk from "chalk"; 
import path from "path";

export type Config = {
  port: number
  base_url?: string
  secret_token: string
  wildduck_api_url: string
  wildduck_api_token: string
  mongodb_url: string
  compression?: boolean | null | undefined
  extra_locales_dirs?: string[]
} & Ssl;

type Ssl = {
  ssl: false
} | {
  ssl: true,
  ssl_certificate: string,
  ssl_certificate_key: string
};

export const load = (filename: string): Config => {
  console.log("> loading config from", chalk.yellow(filename));
  try {
    const source = readFileSync(filename, "utf8");
    const config = assertEquals<Config>(toml.parse(source));
    if (config.extra_locales_dirs) {
      config.extra_locales_dirs = config.extra_locales_dirs.map(f => {
        return path.resolve(path.dirname(filename), f);
      })
    }

    return config;

  } catch(e: any) {
    console.error(chalk.red("Error loading config file: " + e.message))
    process.exit(1);
  }
}