import Link from "../Link/Link"

const Pagination = ({ pageCount, currentPage, url, className }) => {
  let firstPage = false
  let lastPage = false
  let dotsPrevPage = false
  let dotsNextPage = false
  let urlParameterPrefix = url.includes('?') ? '&' : '?'
  
  return pageCount > 1 && (
    <div className={`pagination ${className}`}>
      { Array.from(Array(pageCount)).map((v, i) => {
        let page = i + 1
        let rangePrevPage = currentPage - 2
        let rangeNextPage = currentPage + 2
        let PageComponent = <Link key={i} href={`${url + urlParameterPrefix}page=${page}`} className={"pagination-item" + (page == currentPage ? " pagination-item--active " : "")}>{page}</Link>
        let DotsComponent = <div key={i} className="pagination-dots">...</div>

        if (pageCount == 7) {
          return PageComponent
        }

        if (currentPage == 1) rangeNextPage += 3
        if (currentPage == 2) rangeNextPage += 2
        if (currentPage == 3) rangeNextPage += 1
        if (currentPage == 4) rangePrevPage -= 1
        if (currentPage == pageCount) rangePrevPage -= 3
        if (currentPage == pageCount - 1) rangePrevPage -= 2
        if (currentPage == pageCount - 2) rangePrevPage -= 1
        if (currentPage == pageCount - 3) rangeNextPage += 1

        if (page > rangePrevPage && page < rangeNextPage) {
          return PageComponent
        }

        if (page == 1 && rangePrevPage >= 1 && !firstPage) {
          firstPage = true
          return PageComponent
        }

        if (page == pageCount && rangeNextPage <= pageCount && !lastPage) {
          lastPage = true
          return PageComponent
        }

        if (page > currentPage && (pageCount - currentPage) > 1 && !dotsNextPage) {
          dotsNextPage = true
          return DotsComponent
        }

        if (page < currentPage && (currentPage - 1) > 1 && !dotsPrevPage) {
          dotsPrevPage = true
          return DotsComponent
        }
      }) }
    </div>
  )
}

Pagination.defaultProps = {
  className: ''
}

export default Pagination