import { describe, expect, it } from 'vitest';
import { loadConfig } from '../src/config.js';

const base = { MONGO_URL: 'mongodb://localhost/fuegos', CONFIG_FILE: '/nonexistent.json' };

describe('loadConfig', () => {
  it('defaults to the safest mode (dry-run) with no channels owned', () => {
    const cfg = loadConfig({ ...base } as NodeJS.ProcessEnv);
    expect(cfg.mode).toBe('dry-run');
    expect(cfg.ownedChannels).toEqual([]);
    expect(cfg.killSwitch).toBe(false);
  });

  it('requires MONGO_URL', () => {
    expect(() => loadConfig({ CONFIG_FILE: '/nonexistent.json' } as NodeJS.ProcessEnv)).toThrow(/MONGO_URL/);
  });

  it('rejects an invalid mode', () => {
    expect(() => loadConfig({ ...base, MODE: 'nuke' } as NodeJS.ProcessEnv)).toThrow(/Invalid MODE/);
  });

  it('parses OWNED_CHANNELS and rejects unknown channels', () => {
    expect(loadConfig({ ...base, OWNED_CHANNELS: 'fcm,email' } as NodeJS.ProcessEnv).ownedChannels).toEqual(['fcm', 'email']);
    expect(() => loadConfig({ ...base, OWNED_CHANNELS: 'fcm,telegram' } as NodeJS.ProcessEnv)).toThrow(/Invalid channel/);
  });

  it('parses KILL_SWITCH and canary lists', () => {
    const cfg = loadConfig({ ...base, KILL_SWITCH: '1', CANARY_USER_IDS: 'a, b ,c', MODE: 'canary' } as NodeJS.ProcessEnv);
    expect(cfg.killSwitch).toBe(true);
    expect(cfg.canary.userIds).toEqual(['a', 'b', 'c']);
  });
});