import { useMemo, useRef, useState } from 'react'
import { useLoaderData, useSearchParams } from 'react-router-dom'
import { useLocalStorage } from 'hooks'
import { BlogCardDetails, NSFWFilter, SortBy } from 'types'
import { SearchInput } from '../../components/SearchInput'
import { BlogCard } from '../../components/BlogCard'
import '../../styles/filters.css'
import '../../styles/pagination.css'
import '../../styles/search.css'
import '../../styles/styles.css'

export const BlogsPage = () => {
  const blogs = useLoaderData() as Partial<BlogCardDetails>[] | undefined
  const [filterOptions, setFilterOptions] = useLocalStorage('filter-blog', {
    sort: SortBy.Latest,
    nsfw: NSFWFilter.Hide_NSFW
  })

  // Search
  const searchTermRef = useRef<HTMLInputElement>(null)
  const [searchParams, setSearchParams] = useSearchParams()
  const [searchTerm, setSearchTerm] = useState(searchParams.get('q') || '')
  const handleSearch = () => {
    const value = searchTermRef.current?.value || '' // Access the input value from the ref
    setSearchTerm(value)

    if (value) {
      searchParams.set('q', value)
    } else {
      searchParams.delete('q')
    }

    setSearchParams(searchParams, {
      replace: true
    })
  }
  const handleKeyDown = (event: React.KeyboardEvent<HTMLInputElement>) => {
    if (event.key === 'Enter') {
      handleSearch()
    }
  }

  // Filter
  const filteredBlogs = useMemo(() => {
    const filterNsfwFn = (blog: Partial<BlogCardDetails>) => {
      switch (filterOptions.nsfw) {
        case NSFWFilter.Hide_NSFW:
          return !blog.nsfw
        case NSFWFilter.Only_NSFW:
          return blog.nsfw
        default:
          return blog
      }
    }

    let filtered = blogs?.filter(filterNsfwFn) || []
    const lowerCaseSearchTerm = searchTerm.toLowerCase()

    if (searchTerm !== '') {
      const filterSearchTermFn = (blog: Partial<BlogCardDetails>) =>
        (blog.title || '').toLowerCase().includes(lowerCaseSearchTerm) ||
        (blog.summary || '').toLowerCase().includes(lowerCaseSearchTerm) ||
        (blog.content || '').toLowerCase().includes(lowerCaseSearchTerm) ||
        (blog.tTags || []).findIndex((tag) =>
          tag.toLowerCase().includes(lowerCaseSearchTerm)
        ) > -1
      filtered = filtered.filter(filterSearchTermFn)
    }

    if (filterOptions.sort === SortBy.Latest) {
      filtered.sort((a, b) =>
        a.published_at && b.published_at ? b.published_at - a.published_at : 0
      )
    } else if (filterOptions.sort === SortBy.Oldest) {
      filtered.sort((a, b) =>
        a.published_at && b.published_at ? a.published_at - b.published_at : 0
      )
    }

    return filtered
  }, [blogs, searchTerm, filterOptions.sort, filterOptions.nsfw])

  return (
    <div className='InnerBodyMain'>
      <div className='ContainerMain'>
        <div className='IBMSecMainGroup IBMSecMainGroupAlt'>
          <div className='IBMSecMain'>
            <div className='SearchMainWrapper'>
              <div className='IBMSMTitleMain'>
                <h2 className='IBMSMTitleMainHeading'>Blogs</h2>
              </div>
              <SearchInput
                ref={searchTermRef}
                handleKeyDown={handleKeyDown}
                handleSearch={handleSearch}
              />
            </div>
          </div>

          <div className='IBMSecMain'>
            <div className='FiltersMain'>
              <div className='FiltersMainElement'>
                <div className='dropdown dropdownMain'>
                  <button
                    className='btn dropdown-toggle btnMain btnMainDropdown'
                    aria-expanded='false'
                    data-bs-toggle='dropdown'
                    type='button'
                  >
                    {filterOptions.sort}
                  </button>
                  <div className='dropdown-menu dropdownMainMenu'>
                    {Object.values(SortBy).map((item, index) => (
                      <div
                        key={`sortByItem-${index}`}
                        className='dropdown-item dropdownMainMenuItem'
                        onClick={() =>
                          setFilterOptions((prev) => ({
                            ...prev,
                            sort: item
                          }))
                        }
                      >
                        {item}
                      </div>
                    ))}
                  </div>
                </div>
              </div>
              <div className='FiltersMainElement'>
                <div className='dropdown dropdownMain'>
                  <button
                    className='btn dropdown-toggle btnMain btnMainDropdown'
                    aria-expanded='false'
                    data-bs-toggle='dropdown'
                    type='button'
                  >
                    {filterOptions.nsfw}
                  </button>
                  <div className='dropdown-menu dropdownMainMenu'>
                    {Object.values(NSFWFilter).map((item, index) => (
                      <div
                        key={`nsfwFilterItem-${index}`}
                        className='dropdown-item dropdownMainMenuItem'
                        onClick={() =>
                          setFilterOptions((prev) => ({
                            ...prev,
                            nsfw: item
                          }))
                        }
                      >
                        {item}
                      </div>
                    ))}
                  </div>
                </div>
              </div>
            </div>

            <div className='IBMSecMain IBMSMListWrapper'>
              <div className='IBMSMList'>
                {filteredBlogs &&
                  filteredBlogs.map((b) => <BlogCard key={b.id} {...b} />)}
              </div>
            </div>

            <div className='IBMSecMain'>
              <div className='PaginationMain'>
                <div className='PaginationMainInside'>
                  <a
                    className='PaginationMainInsideBox PaginationMainInsideBoxArrows'
                    href='#'
                  >
                    <i className='fas fa-chevron-left'></i>
                  </a>
                  <div className='PaginationMainInsideBoxGroup'>
                    <a className='PaginationMainInsideBox PMIBActive' href='#'>
                      <p>1</p>{' '}
                    </a>
                    <a className='PaginationMainInsideBox' href='#'>
                      <p>2</p>{' '}
                    </a>
                    <a className='PaginationMainInsideBox' href='#'>
                      <p>3</p>
                    </a>
                    <p className='PaginationMainInsideBox PMIBDots'>...</p>
                    <a className='PaginationMainInsideBox' href='#'>
                      <p>8</p>
                    </a>
                  </div>
                  <a
                    className='PaginationMainInsideBox PaginationMainInsideBoxArrows'
                    href='#'
                  >
                    <i className='fas fa-chevron-right'></i>
                  </a>
                </div>
              </div>
            </div>
          </div>
        </div>
      </div>
    </div>
  )
}