import { describe, it, expect } from 'vitest'
import * as fc from 'fast-check'
import { resolveBannerNavigation } from '../utils/navigation.js'

describe('Property 7: Banner导航正确性', () => {
  /**
   * **Feature: mobile-app, Property 7: Banner导航正确性**
   * **Validates: Requirements 3.2**
   *
   * 对于任意Banner配置项，当linkType为"internal"时点击应调用内部页面导航，
   * 当linkType为"external"时点击应调用外部链接打开，
   * 且目标URL应等于配置的linkUrl。
   */
  it('internal类型Banner应返回internal导航，external类型应返回external导航，URL保持一致', () => {
    const linkTypeArb = fc.constantFrom('internal', 'external')
    const urlArb = fc.string({ minLength: 1, maxLength: 200 }).filter(s => s.trim().length > 0)

    fc.assert(
      fc.property(linkTypeArb, urlArb, (linkType, linkUrl) => {
        const banner = { id: '1', imageUrl: 'http://img.test/a.png', linkType, linkUrl }
        const result = resolveBannerNavigation(banner)

        // 导航结果不为null
        expect(result).not.toBeNull()
        // 导航类型与Banner配置一致
        expect(result.type).toBe(linkType)
        // 导航URL与Banner配置一致
        expect(result.url).toBe(linkUrl)
      }),
      { numRuns: 100 }
    )
  })

  it('无效Banner（无linkUrl或null）应返回null', () => {
    const invalidBannerArb = fc.constantFrom(
      null,
      undefined,
      {},
      { linkType: 'internal' },
      { linkType: 'external', linkUrl: '' }
    )

    fc.assert(
      fc.property(invalidBannerArb, (banner) => {
        const result = resolveBannerNavigation(banner)
        expect(result).toBeNull()
      }),
      { numRuns: 20 }
    )
  })
})