import { describe, it, expect, vi, beforeEach, type Mock } from 'vitest'
import { usePagination } from '#lib/composables'

vi.mock('#imports', () => ({
  persistedState: vi.fn().mockReturnValue({
    localStorage: {},
  }),
}))

describe('usePagination', () => {
  let scrollIntoViewMock: Mock

  beforeEach(() => {
    scrollIntoViewMock = vi.fn()
    global.document.querySelector = vi.fn().mockReturnValue({
      scrollIntoView: scrollIntoViewMock,
    })
  })

  it('should scroll to the specified section if the element exists', () => {
    const { onLoadPage } = usePagination()
    const selector = '#section-id'

    onLoadPage(selector, false)

    expect(global.document.querySelector).toHaveBeenCalledWith(selector)
    expect(scrollIntoViewMock).toHaveBeenCalledWith({ behavior: 'smooth' })
  })

  it('should not attempt to scroll if the element does not exist', () => {
    global.document.querySelector = vi.fn().mockReturnValue(null)

    const { onLoadPage } = usePagination()
    const selector = '#non-existent-section'

    onLoadPage(selector, false)

    expect(global.document.querySelector).toHaveBeenCalledWith(selector)
    expect(scrollIntoViewMock).not.toHaveBeenCalled()
  })

  it('should handle the paramInUrl flag without throwing errors', () => {
    const { onLoadPage } = usePagination()

    expect(() => {
      onLoadPage('#section-id', true)
    }).not.toThrow()

    // Placeholder for future URL handling logic
  })

  it('should not throw errors when no scrollToSection is provided', () => {
    const { onLoadPage } = usePagination()

    expect(() => {
      onLoadPage('', false)
    }).not.toThrow()

    expect(global.document.querySelector).not.toHaveBeenCalled()
    expect(scrollIntoViewMock).not.toHaveBeenCalled()
  })
})