// @vitest-environment happy-dom
import { describe, it, expect, vi } from 'vitest'
import { flushPromises } from '@vue/test-utils'

import PostCard from '../../src/components/posts/PostCard.vue'
import { useModalStore } from '../../src/stores/modal.js'
import { freshPinia, mountComponent } from '../support/mountComponent.js'

const now = new Date().toISOString()
const BASE = {
  id: 1, external_post_id: 'P1',
  post_title: '<strong>Hello World</strong>',
  post_url: 'https://x/1', post_date: now, downloaded_at: now,
  artist: { id: 1, name: 'Sabu', slug: 'sabu' },
  source: { id: 1, platform: 'subscribestar' },
  thumbnails: [], thumbnails_more: 0, attachments: [],
}

describe('PostCard', () => {
  it('renders the HTML-stripped title and the artist', () => {
    const post = { ...BASE, description_plain: 'a description' }
    const w = mountComponent(PostCard, { props: { post }, pinia: freshPinia() })
    const t = w.text()
    expect(t).toContain('Hello World')   // plain title
    expect(t).not.toContain('<strong>')  // tags stripped
    expect(t).toContain('Sabu')          // artist (RouterLink slot)
  })

  it('shows a "Show more" toggle only when the description is truncated', () => {
    const truncated = mountComponent(PostCard, {
      props: { post: { ...BASE, description_plain: 'lots of text…', description_truncated: true } },
      pinia: freshPinia(),
    })
    expect(truncated.text()).toContain('Show more')

    const full = mountComponent(PostCard, {
      props: { post: { ...BASE, description_plain: 'short', description_truncated: false } },
      pinia: freshPinia(),
    })
    expect(full.text()).not.toContain('Show more')
  })

  // #388 E2. The honesty marker is the only thing standing between "FC
  // assembled this" and the card reading as something the artist authored, so
  // these pin BOTH directions: it appears when the flag is set, and — the one
  // that actually matters — it is absent on every ordinary post.
  describe('synthetic posts', () => {
    const SYNTH = {
      ...BASE,
      post_title: null,
      synthesized_by: 'discord_drop',
      synthesis: { message_count: 4, member_post_ids: [1, 2, 3, 4] },
    }

    it('says FC grouped it, and what from', () => {
      const w = mountComponent(PostCard, { props: { post: SYNTH }, pinia: freshPinia() })
      expect(w.find('.fc-post-card__synthetic').exists()).toBe(true)
      expect(w.text()).toContain('grouped by FabledCurator')
      expect(w.text()).toContain('Grouped from 4 Discord messages')
    })

    it('never marks an ordinary post', () => {
      const w = mountComponent(PostCard, { props: { post: BASE }, pinia: freshPinia() })
      expect(w.find('.fc-post-card__synthetic').exists()).toBe(false)
      expect(w.text()).not.toContain('grouped by FabledCurator')
    })

    it('does not leak the internal drop key as a title', () => {
      // post_title is NULL on purpose (inventing one would put words in a
      // creator's mouth), so the untitled fallback must not print
      // `fc-drop:<message id>` the way it does for a real untitled post.
      const w = mountComponent(PostCard, {
        props: { post: { ...SYNTH, external_post_id: 'fc-drop:99887766' } },
        pinia: freshPinia(),
      })
      expect(w.text()).not.toContain('fc-drop:')
    })

    it('degrades to unmarked when the field is absent entirely', () => {
      // A post dict composed before the field existed must read as "not
      // synthetic" rather than throw on `synthesis.message_count`.
      const { synthesized_by: _drop, synthesis: _also, ...legacy } = SYNTH
      const w = mountComponent(PostCard, { props: { post: legacy }, pinia: freshPinia() })
      expect(w.find('.fc-post-card__synthetic').exists()).toBe(false)
    })

    it('reports growth separately from the post date', () => {
      // The drop's own date is its identity; growth is news about it. "From
      // Tuesday, gained images this morning" is the trickling-in signal, and
      // collapsing the two would erase it.
      const w = mountComponent(PostCard, {
        props: {
          post: { ...SYNTH, last_grew_at: new Date(Date.now() - 3600e3).toISOString() },
        },
        pinia: freshPinia(),
      })
      expect(w.text()).toContain('updated 1h ago')
    })

    it('says nothing about growth on a grouping that has not grown', () => {
      // An "updated" label that is always there teaches you to ignore it.
      const w = mountComponent(PostCard, {
        props: { post: { ...SYNTH, last_grew_at: null } },
        pinia: freshPinia(),
      })
      expect(w.text()).not.toContain('updated')
    })

    it('never claims an ordinary post grew, even if the field leaks in', () => {
      const w = mountComponent(PostCard, {
        props: { post: { ...BASE, last_grew_at: new Date().toISOString() } },
        pinia: freshPinia(),
      })
      expect(w.text()).not.toContain('updated')
    })

    it('singularises a one-message drop', () => {
      const w = mountComponent(PostCard, {
        props: { post: { ...SYNTH, synthesis: { message_count: 1 } } },
        pinia: freshPinia(),
      })
      expect(w.text()).toContain('Grouped from 1 Discord message')
      expect(w.text()).not.toContain('1 Discord messages')
    })
  })

  const thumbs = (n) =>
    Array.from({ length: n }, (_, i) => ({ image_id: 100 + i, thumbnail_url: `/t${i}` }))

  it('fills the rail to full width (5 cells, no overflow) for a 6-image post', () => {
    const post = { ...BASE, description_plain: 'd', thumbnails: thumbs(6), thumbnails_more: 0 }
    const w = mountComponent(PostCard, { props: { post }, pinia: freshPinia() })
    // hero + 5 rail thumbnails, no "+N" tile.
    expect(w.findAll('.fc-post-card__rail-cell')).toHaveLength(5)
    expect(w.find('.fc-post-card__rail-more').exists()).toBe(false)
    // The grid spans the hero width via a column count == cells shown.
    expect(w.find('.fc-post-card__rail').attributes('style')).toContain('--fc-rail-cols: 5')
  })

  it('reserves the last cell for a "+N" overflow tile when there are more images', () => {
    const post = { ...BASE, description_plain: 'd', thumbnails: thumbs(6), thumbnails_more: 4 }
    const w = mountComponent(PostCard, { props: { post }, pinia: freshPinia() })
    // 4 thumbnails + 1 overflow tile == 5 columns; tile counts every hidden image.
    expect(w.findAll('.fc-post-card__rail-cell')).toHaveLength(4)
    const more = w.find('.fc-post-card__rail-more')
    expect(more.exists()).toBe(true)
    expect(more.text()).toBe('+5')
    expect(w.find('.fc-post-card__rail').attributes('style')).toContain('--fc-rail-cols: 5')
  })

  it('clicking an image opens the post-scoped modal (never expands the card)', async () => {
    const pinia = freshPinia()
    const modal = useModalStore()
    const openSpy = vi.spyOn(modal, 'open').mockResolvedValue()
    const post = {
      ...BASE,
      description_plain: 'd',
      thumbnails: [
        { image_id: 10, thumbnail_url: '/a' },
        { image_id: 11, thumbnail_url: '/b' },
      ],
      thumbnails_more: 0,
    }
    const w = mountComponent(PostCard, { props: { post }, pinia })
    await w.find('.fc-post-card__hero').trigger('click')
    await flushPromises()
    expect(openSpy).toHaveBeenCalledWith(10, { playlistIds: [10, 11] })
  })
})