import { describe, expect, it } from 'vitest';

import { lookupOperator, operatorLabel } from './operators.js';

describe('lookupOperator', () => {
  it('resolves an assigned mainland PLMN', () => {
    expect(lookupOperator('460', '00')?.name).toBe('中国移动');
    expect(lookupOperator(460, 1)?.name).toBe('中国联通');
    expect(lookupOperator('460', '15')?.name).toBe('中国广电');
    expect(lookupOperator('460', '20')?.name).toBe('中国铁通');
  });

  it('pads a single-digit MNC the way the network reports it', () => {
    expect(lookupOperator('460', '3')?.name).toBe('中国电信');
  });

  it('leaves foreign and unassigned codes unresolved', () => {
    expect(lookupOperator('262', '01')).toBeNull();
    expect(lookupOperator('460', '77')).toBeNull();
    expect(lookupOperator(undefined, '01')).toBeNull();
    expect(lookupOperator('', '')).toBeNull();
  });
});

describe('operatorLabel', () => {
  it('prefers the registry over the string the device reported', () => {
    expect(operatorLabel({ mcc: '460', mnc: '00', operator: 'CHN-CMCC' })).toBe('中国移动');
  });

  it('falls back to the reported name, then the bare PLMN, then the caller default', () => {
    expect(operatorLabel({ mcc: '262', mnc: '01', operator: 'Telekom' })).toBe('Telekom');
    expect(operatorLabel({ mcc: '262', mnc: '01' })).toBe('262-01');
    expect(operatorLabel({})).toBe('未知运营商');
    expect(operatorLabel({ operator: '  ' })).toBe('未知运营商');
  });

  it('accepts a custom fallback for a table cell', () => {
    expect(operatorLabel({ fallback: '运营商未知' })).toBe('运营商未知');
  });
});