import { describe, it, expect } from 'vitest'
import router, { FRONT_DOOR, scrollBehavior } from '../src/router.js'

describe('router', () => {
  it('FRONT_DOOR is the post feed', () => {
    // Moved from /showcase in #387 B1. Asserted on the constant rather than on
    // a navigation so the intent is pinned: the door is the feed, and moving it
    // again should be a deliberate edit to a failing test, not a quiet change.
    expect(FRONT_DOOR).toBe('/latest')
  })

  it('/latest is the feed, mounted outside the Browse tab strip', () => {
    const r = router.resolve('/latest')
    expect(r.name).toBe('latest')
    // A nav entry in its own right (meta.title is what TopNav lists on), and
    // first in the order.
    expect(r.meta.title).toBe('Latest')
    expect(r.meta.navOrder).toBe(5)
    // Deliberately NOT stickyChrome — it has no sticky sub-header for the nav
    // to butt against, unlike Browse/Gallery/Settings.
    expect(r.meta.stickyChrome).toBeUndefined()
  })

  it('showcase is demoted, not removed — still reachable and still in the nav', () => {
    const r = router.resolve('/showcase')
    expect(r.name).toBe('showcase')
    expect(r.meta.title).toBe('Showcase')
  })

  it('/ redirects to FRONT_DOOR', async () => {
    // resolve() does not follow redirects (they apply on navigation), so
    // actually navigate and assert the resulting route.
    await router.push('/')
    expect(router.currentRoute.value.path).toBe(FRONT_DOOR)
  })

  it('gallery is reachable at /gallery', () => {
    expect(router.resolve('/gallery').name).toBe('gallery')
  })

  it('showcase, artist resolve to named routes', () => {
    expect(router.resolve('/showcase').name).toBe('showcase')
    expect(router.resolve('/artist/some-slug').name).toBe('artist')
    expect(router.resolve('/artist/some-slug').params.slug).toBe('some-slug')
  })

  it('browse hub is reachable and old axis paths redirect into its tabs', async () => {
    expect(router.resolve('/browse').name).toBe('browse')

    await router.push('/tags')
    expect(router.currentRoute.value.name).toBe('browse')
    expect(router.currentRoute.value.query.tab).toBe('tags')

    await router.push('/artists')
    expect(router.currentRoute.value.query.tab).toBe('artists')

    // A posts deep link survives the redirect into the hub tab.
    await router.push({ path: '/posts', query: { post_id: '7' } })
    expect(router.currentRoute.value.name).toBe('browse')
    expect(router.currentRoute.value.query.tab).toBe('posts')
    expect(router.currentRoute.value.query.post_id).toBe('7')
  })

  it('/system redirects into the Settings System tab', async () => {
    // It shipped as a standalone page for one build; the health dot and any
    // bookmark from it must still land on the surface, which is now a tab.
    await router.push('/system')
    expect(router.currentRoute.value.name).toBe('settings')
    expect(router.currentRoute.value.query.tab).toBe('system')
  })

  it('series-read is an immersive route', () => {
    const r = router.resolve('/series/5/read')
    expect(r.name).toBe('series-read')
    expect(r.meta.immersive).toBe(true)
  })

  describe('scrollBehavior', () => {
    const at = (path) => ({ path, hash: '', matched: [{}] })

    it('opens a new view at its top, not at the last view\'s offset', () => {
      expect(scrollBehavior(at('/settings'), at('/latest'), null)).toEqual({ top: 0 })
    })

    it('back and forward return to where the entry was left', () => {
      const saved = { left: 0, top: 1234 }
      expect(scrollBehavior(at('/latest'), at('/settings'), saved)).toBe(saved)
    })

    it('a new query on the same view keeps its place', () => {
      expect(scrollBehavior(at('/gallery'), at('/gallery'), null)).toBe(false)
    })

    it('the first navigation of a page load opens at the top', () => {
      const initial = { path: '/', hash: '', matched: [] }
      expect(scrollBehavior(at('/latest'), initial, null)).toEqual({ top: 0 })
    })
  })
})