import { describe, expect, it, vi } from 'vitest'
import { useAdminUserPages } from './useAdminUserPages'

const pageOf = (accounts: string[], total: number) => ({
  items: accounts.map((account, i) => ({ id: `u${i}`, account })) as never,
  nextCursor: null,
  hasMore: false,
  total
})

describe('useAdminUserPages 分页状态', () => {
  it('loadPage 推进页码并落 items/total（透传 page/pageSize 给 fetch）', async () => {
    const fetch = vi.fn().mockResolvedValue(pageOf(['a', 'b'], 35))
    const state = useAdminUserPages(fetch)
    await state.loadPage(2)
    expect(fetch).toHaveBeenCalledWith(2, 20)
    expect(state.page.value).toBe(2)
    expect(state.items.value).toHaveLength(2)
    expect(state.total.value).toBe(35)
  })

  it('total 缺省（旧响应形态）回退 items 长度，不抛错', async () => {
    const fetch = vi.fn().mockResolvedValue({
      items: [],
      nextCursor: null,
      hasMore: false
    })
    const state = useAdminUserPages(fetch)
    await state.loadPage()
    expect(state.total.value).toBe(0)
  })

  it('fetch 抛错 → error 捕获、loading 复位、页码不推进', async () => {
    const fetch = vi.fn().mockRejectedValue(new Error('boom'))
    const state = useAdminUserPages(fetch)
    await state.loadPage(3)
    expect(state.error.value?.message).toBe('boom')
    expect(state.loading.value).toBe(false)
    expect(state.page.value).toBe(1)
  })

  it('onSizeChange 回第 1 页；replaceItem 原地替换当前页条目', async () => {
    const fetch = vi.fn().mockResolvedValue(pageOf(['a'], 5))
    const state = useAdminUserPages(fetch)
    await state.loadPage(2)
    state.onSizeChange()
    await Promise.resolve()
    await Promise.resolve()
    expect(fetch).toHaveBeenLastCalledWith(1, 20)
    state.replaceItem(0, { id: 'u0', account: 'a2' } as never)
    expect(state.items.value[0]?.account).toBe('a2')
  })
})