import {
  type LevelName,
  LogLevels,
} from "https://deno.land/std@0.159.0/log/mod.ts";

export interface Config {
  log: {
    consoleLevelName: LevelName;
  };
  postgres: {
    url: string;
  };
  mailgun: {
    apiKey?: string;
    domain?: string;
  };
}

function envOrWarn(key: string, fallback: string): string {
  const val = Deno.env.get(key);
  if (!val) console.warn(`${key} is not set! Using fallback: ${fallback}`);
  return val || fallback;
}

function isLogLevelName(s: string): s is LevelName {
  return s in LogLevels;
}

const desiredLogLevel = envOrWarn("LOG_LEVEL", "INFO").toUpperCase();
if (!isLogLevelName(desiredLogLevel)) {
  console.warn(
    `Desired LOG_LEVEL of '${desiredLogLevel}' is invalid. Falling back to 'INFO'`,
  );
}

const logLevel: LevelName = isLogLevelName(desiredLogLevel)
  ? desiredLogLevel
  : "INFO";

export const config: Config = {
  log: {
    consoleLevelName: logLevel,
  },
  postgres: {
    url: envOrWarn(
      "POSTGRES_URL",
      "postgresql://postgres:@127.0.0.1:5432/lyricscreen",
    ),
  },
  mailgun: {},
};