import React from 'react'
import { act, render, screen, waitFor } from '@testing-library/react'
import { describe, expect, it, vi, beforeEach, afterEach } from 'vitest'
import useLazyProfileFeaturedArtworks from './useLazyProfileFeaturedArtworks'

function Harness({ username = 'alice', initial = null, enabled = false }) {
  const state = useLazyProfileFeaturedArtworks({
    username,
    initialFeaturedArtworks: initial,
    enabled,
  })

  return (
    <div>
      <span data-testid="count">{state.items.length}</span>
      <span data-testid="loading">{String(state.loading)}</span>
      <span data-testid="error">{String(state.error)}</span>
      <button type="button" onClick={state.retry}>retry</button>
      {state.items.map((item) => <span key={item.id}>{item.title}</span>)}
    </div>
  )
}

describe('useLazyProfileFeaturedArtworks', () => {
  beforeEach(() => {
    vi.stubGlobal('fetch', vi.fn(async () => ({
      ok: true,
      json: async () => ({ data: [{ id: 1, title: 'Featured one' }] }),
    })))
  })

  afterEach(() => vi.unstubAllGlobals())

  it('does not request while the posts tab is active', () => {
    render(<Harness />)
    expect(fetch).not.toHaveBeenCalled()
  })

  it('loads once on first artworks activation and reuses the result', async () => {
    const view = render(<Harness enabled />)

    await waitFor(() => expect(screen.getByText('Featured one')).toBeTruthy())
    expect(fetch).toHaveBeenCalledTimes(1)

    view.rerender(<Harness enabled={false} />)
    view.rerender(<Harness enabled />)
    expect(fetch).toHaveBeenCalledTimes(1)
  })

  it('does not request when SSR already supplied featured artworks', () => {
    render(<Harness enabled initial={[{ id: 9, title: 'SSR feature' }]} />)
    expect(screen.getByText('SSR feature')).toBeTruthy()
    expect(fetch).not.toHaveBeenCalled()
  })

  it('allows a safe retry after failure', async () => {
    fetch.mockRejectedValueOnce(new Error('network'))
    render(<Harness enabled />)

    await waitFor(() => expect(screen.getByTestId('error').textContent).toBe('true'))
    await act(async () => screen.getByRole('button', { name: 'retry' }).click())
    await waitFor(() => expect(screen.getByText('Featured one')).toBeTruthy())
    expect(fetch).toHaveBeenCalledTimes(2)
  })

  it('ignores a stale response after profile navigation', async () => {
    let resolveAlice
    fetch.mockImplementationOnce(() => new Promise((resolve) => { resolveAlice = resolve }))
    const view = render(<Harness username="alice" enabled />)

    view.rerender(<Harness username="bob" enabled={false} />)
    await act(async () => resolveAlice({ ok: true, json: async () => ({ data: [{ id: 1, title: 'Alice feature' }] }) }))

    expect(screen.queryByText('Alice feature')).toBeNull()
    expect(screen.getByTestId('count').textContent).toBe('0')
  })
})