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

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

  return <output data-testid="state">{JSON.stringify(state)}</output>
}

describe('useLazyProfileWorldHistory', () => {
  beforeEach(() => vi.restoreAllMocks())

  it('does not request on Posts until a consuming tab is active', () => {
    const fetchMock = vi.spyOn(globalThis, 'fetch')
    render(<Harness />)
    expect(fetchMock).not.toHaveBeenCalled()
  })

  it('requests once on first consuming-tab activation and reuses the result', async () => {
    const fetchMock = vi.spyOn(globalThis, 'fetch').mockResolvedValue({
      ok: true,
      json: async () => ({ summary: { available: true }, entries: [{ id: 'world-1' }] }),
    })
    const view = render(<Harness />)

    view.rerender(<Harness enabled />)
    await waitFor(() => expect(fetchMock).toHaveBeenCalledTimes(1))
    view.rerender(<Harness enabled={false} />)
    view.rerender(<Harness enabled />)
    expect(fetchMock).toHaveBeenCalledTimes(1)
    await waitFor(() => expect(JSON.parse(view.getByTestId('state').textContent).loaded).toBe(true))
  })

  it('uses direct Worlds/Achievements SSR data without a lazy request', async () => {
    const fetchMock = vi.spyOn(globalThis, 'fetch')
    const initial = { summary: { available: true }, entries: [{ id: 'world-1' }] }
    const view = render(<Harness initial={initial} enabled />)
    view.rerender(<Harness initial={initial} enabled={false} />)
    view.rerender(<Harness initial={initial} enabled />)

    await waitFor(() => expect(JSON.parse(view.getByTestId('state').textContent).data).toEqual(initial))
    expect(fetchMock).not.toHaveBeenCalled()
  })

  it('treats an empty response as loaded', async () => {
    const fetchMock = vi.spyOn(globalThis, 'fetch').mockResolvedValue({ ok: true, json: async () => ({ summary: { available: false }, entries: [] }) })
    const view = render(<Harness enabled />)
    await waitFor(() => expect(JSON.parse(view.getByTestId('state').textContent).loaded).toBe(true))
    expect(fetchMock).toHaveBeenCalledTimes(1)
  })

  it('resets on profile navigation and ignores the stale response', async () => {
    let resolveA
    const fetchMock = vi.spyOn(globalThis, 'fetch').mockImplementation(() => new Promise((resolve) => { resolveA = resolve }))
    const view = render(<Harness username="alice" enabled />)
    await waitFor(() => expect(fetchMock).toHaveBeenCalledTimes(1))

    view.rerender(<Harness username="bob" enabled />)
    resolveA({ ok: true, json: async () => ({ summary: { available: true }, entries: [{ id: 'alice' }] }) })
    await waitFor(() => expect(JSON.parse(view.getByTestId('state').textContent).data).toBe(null))
  })

  it('does not loop after an error and permits an explicit retry', async () => {
    const fetchMock = vi.spyOn(globalThis, 'fetch')
      .mockResolvedValueOnce({ ok: false })
      .mockResolvedValueOnce({ ok: true, json: async () => ({ summary: { available: false }, entries: [] }) })
    const view = render(<Harness enabled />)
    await waitFor(() => expect(JSON.parse(view.getByTestId('state').textContent).error).toBe(true))
    expect(fetchMock).toHaveBeenCalledTimes(1)
    // The hook's returned retry is intentionally exercised through a small rerender activation.
    view.rerender(<Harness enabled={false} />)
    view.rerender(<Harness enabled />)
    await waitFor(() => expect(fetchMock).toHaveBeenCalledTimes(2))
  })
})