import type { ChangeEventHandler, UIEventHandler } from 'react'
import { Popover, PopoverContent, PopoverTrigger } from '@langgenius/dify-ui/popover'
import { useCallback, useRef, useState } from 'react'
import { useTranslation } from 'react-i18next'
import Input from '@/app/components/base/input'
import { useEducation } from './hooks'

type SearchInputProps = {
  value?: string
  onChange: (value: string) => void
}

const SearchInput = ({ value, onChange }: SearchInputProps) => {
  const { t } = useTranslation()
  const [open, setOpen] = useState(false)
  const { schools, setSchools, querySchoolsWithDebounced, handleUpdateSchools, hasNext } =
    useEducation()
  const pageRef = useRef(0)
  const valueRef = useRef(value)

  const handleSearch = useCallback(
    (debounced?: boolean) => {
      const keywords = valueRef.current
      const page = pageRef.current
      if (debounced) {
        querySchoolsWithDebounced({
          keywords,
          page,
        })
        return
      }

      handleUpdateSchools({
        keywords,
        page,
      })
    },
    [handleUpdateSchools, querySchoolsWithDebounced],
  )

  const handleValueChange: ChangeEventHandler<HTMLInputElement> = useCallback(
    (e) => {
      setOpen(true)
      setSchools([])
      pageRef.current = 0
      const inputValue = e.target.value
      valueRef.current = inputValue
      onChange(inputValue)
      handleSearch(true)
    },
    [handleSearch, onChange, setSchools],
  )

  const handleScroll: UIEventHandler<HTMLDivElement> = useCallback(
    (e) => {
      const target = e.currentTarget
      const { scrollTop, scrollHeight, clientHeight } = target
      if (scrollTop + clientHeight >= scrollHeight - 5 && scrollTop > 0 && hasNext) {
        pageRef.current += 1
        handleSearch()
      }
    },
    [handleSearch, hasNext],
  )

  return (
    <Popover open={open} onOpenChange={setOpen}>
      <PopoverTrigger
        nativeButton={false}
        render={
          <Input
            className="w-full"
            placeholder={t(($) => $['form.schoolName.placeholder'], { ns: 'education' })}
            value={value}
            onChange={handleValueChange}
          />
        }
      />
      {!!schools.length && !!value ? (
        <PopoverContent
          placement="bottom"
          sideOffset={4}
          popupClassName="w-[var(--anchor-width)] rounded-xl border-[0.5px] border-components-panel-border bg-components-panel-bg-blur p-1 shadow-lg"
        >
          <div className="max-h-[330px] overflow-y-auto" onScroll={handleScroll}>
            {schools.map((school) => (
              <div
                key={school}
                className="flex h-8 cursor-pointer items-center truncate rounded-lg px-2 py-1.5 system-md-regular text-text-secondary hover:bg-state-base-hover"
                title={school}
                onClick={() => {
                  onChange(school)
                  setOpen(false)
                }}
              >
                {school}
              </div>
            ))}
          </div>
        </PopoverContent>
      ) : null}
    </Popover>
  )
}

export default SearchInput