dify/web/app/components/header/nav/nav-selector/index.tsx

'use client'
import { useTranslation } from 'react-i18next'
import { Fragment, useCallback } from 'react'
import {
  RiAddLine,
  RiArrowDownSLine,
  RiArrowRightSLine,
} from '@remixicon/react'
import { Menu, MenuButton, MenuItem, MenuItems, Transition } from '@headlessui/react'
import { useRouter } from 'next/navigation'
import { debounce } from 'lodash-es'
import cn from '@/utils/classnames'
import AppIcon from '@/app/components/base/app-icon'
import { AiText, ChatBot, CuteRobot } from '@/app/components/base/icons/src/vender/solid/communication'
import { Route } from '@/app/components/base/icons/src/vender/solid/mapsAndTravel'
import { useAppContext } from '@/context/app-context'
import { useStore as useAppStore } from '@/app/components/app/store'
import { FileArrow01, FilePlus01, FilePlus02 } from '@/app/components/base/icons/src/vender/line/files'
import type { AppIconType } from '@/types/app'

export type NavItem = {
  id: string
  name: string
  link: string
  icon_type: AppIconType | null
  icon: string
  icon_background: string | null
  icon_url: string | null
  mode?: string
}
export type INavSelectorProps = {
  navigationItems: NavItem[]
  curNav?: Omit<NavItem, 'link'>
  createText: string
  isApp?: boolean
  onCreate: (state: string) => void
  onLoadMore?: () => void
}

const NavSelector = ({ curNav, navigationItems, createText, isApp, onCreate, onLoadMore }: INavSelectorProps) => {
  const { t } = useTranslation()
  const router = useRouter()
  const { isCurrentWorkspaceEditor } = useAppContext()
  const setAppDetail = useAppStore(state => state.setAppDetail)

  const handleScroll = useCallback(debounce((e) => {
    if (typeof onLoadMore === 'function') {
      const { clientHeight, scrollHeight, scrollTop } = e.target

      if (clientHeight + scrollTop > scrollHeight - 50)
        onLoadMore()
    }
  }, 50), [])

  return (
    <div className="">
      <Menu as="div" className="relative inline-block text-left">
        {({ open }) => (
          <>
            <MenuButton className={cn(
              'hover:hover:bg-components-main-nav-nav-button-bg-active-hover group inline-flex h-7 w-full items-center justify-center rounded-[10px] pl-2 pr-2.5 text-[14px] font-semibold text-components-main-nav-nav-button-text-active',
              open && 'bg-components-main-nav-nav-button-bg-active',
            )}>
              <div className='max-w-[180px] truncate' title={curNav?.name}>{curNav?.name}</div>
              <RiArrowDownSLine
                className={cn('ml-1 h-3 w-3 shrink-0 opacity-50 group-hover:opacity-100', open && '!opacity-100')}
                aria-hidden="true"
              />
            </MenuButton>
            <MenuItems
              className="
                absolute -left-11 right-0 mt-1.5 w-60 max-w-80
                origin-top-right divide-y divide-divider-regular rounded-lg bg-components-panel-bg-blur
                shadow-lg
              "
            >
              <div className="overflow-auto px-1 py-1" style={{ maxHeight: '50vh' }} onScroll={handleScroll}>
                {
                  navigationItems.map(nav => (
                    <MenuItem key={nav.id}>
                      <div className='flex w-full cursor-pointer items-center truncate rounded-lg px-3 py-[6px] text-[14px] font-normal text-text-secondary hover:bg-state-base-hover' onClick={() => {
                        if (curNav?.id === nav.id)
                          return
                        setAppDetail()
                        router.push(nav.link)
                      }} title={nav.name}>
                        <div className='relative mr-2 h-6 w-6 rounded-md'>
                          <AppIcon size='tiny' iconType={nav.icon_type} icon={nav.icon} background={nav.icon_background} imageUrl={nav.icon_url} />
                          {!!nav.mode && (
                            <span className={cn(
                              'absolute -bottom-0.5 -right-0.5 h-3.5 w-3.5 rounded border-[0.5px] border-[rgba(0,0,0,0.02)] bg-white p-0.5 shadow-sm',
                            )}>
                              {nav.mode === 'advanced-chat' && (
                                <ChatBot className='h-2.5 w-2.5 text-[#1570EF]' />
                              )}
                              {nav.mode === 'agent-chat' && (
                                <CuteRobot className='h-2.5 w-2.5 text-indigo-600' />
                              )}
                              {nav.mode === 'chat' && (
                                <ChatBot className='h-2.5 w-2.5 text-[#1570EF]' />
                              )}
                              {nav.mode === 'completion' && (
                                <AiText className='h-2.5 w-2.5 text-[#0E9384]' />
                              )}
                              {nav.mode === 'workflow' && (
                                <Route className='h-2.5 w-2.5 text-[#f79009]' />
                              )}
                            </span>
                          )}
                        </div>
                        <div className='truncate'>
                          {nav.name}
                        </div>
                      </div>
                    </MenuItem>
                  ))
                }
              </div>
              {!isApp && isCurrentWorkspaceEditor && (
                <MenuItem as="div" className='w-full p-1'>
                  <div onClick={() => onCreate('')} className={cn(
                    'flex cursor-pointer items-center gap-2 rounded-lg px-3 py-[6px] hover:bg-state-base-hover ',
                  )}>
                    <div className='flex h-6 w-6 shrink-0 items-center justify-center rounded-[6px] border-[0.5px] border-divider-regular bg-background-default'>
                      <RiAddLine className='h-4 w-4 text-text-primary' />
                    </div>
                    <div className='grow text-left text-[14px] font-normal text-text-secondary'>{createText}</div>
                  </div>
                </MenuItem>
              )}
              {isApp && isCurrentWorkspaceEditor && (
                <Menu as="div" className="relative h-full w-full">
                  {({ open }) => (
                    <>
                      <MenuButton className='w-full p-1'>
                        <div className={cn(
                          'flex cursor-pointer items-center gap-2 rounded-lg px-3 py-[6px] hover:bg-state-base-hover',
                          open && '!bg-state-base-hover',
                        )}>
                          <div className='flex h-6 w-6 shrink-0 items-center justify-center rounded-[6px] border-[0.5px] border-divider-regular bg-background-default'>
                            <RiAddLine className='h-4 w-4 text-text-primary' />
                          </div>
                          <div className='grow text-left text-[14px] font-normal text-text-secondary'>{createText}</div>
                          <RiArrowRightSLine className='h-3.5 w-3.5 shrink-0 text-text-primary' />
                        </div>
                      </MenuButton>
                      <Transition
                        as={Fragment}
                        enter="transition ease-out duration-100"
                        enterFrom="transform opacity-0 scale-95"
                        enterTo="transform opacity-100 scale-100"
                        leave="transition ease-in duration-75"
                        leaveFrom="transform opacity-100 scale-100"
                        leaveTo="transform opacity-0 scale-95"
                      >
                        <MenuItems className={cn(
                          'absolute right-[-198px] top-[3px] z-10 min-w-[200px] rounded-lg bg-components-panel-bg-blur shadow-lg',
                        )}>
                          <div className='p-1'>
                            <div className={cn('flex cursor-pointer items-center rounded-lg px-3 py-[6px] font-normal text-text-secondary hover:bg-state-base-hover')} onClick={() => onCreate('blank')}>
                              <FilePlus01 className='mr-2 h-4 w-4 shrink-0 text-text-secondary' />
                              {t('app.newApp.startFromBlank')}
                            </div>
                            <div className={cn('flex cursor-pointer items-center rounded-lg px-3 py-[6px] font-normal text-text-secondary hover:bg-state-base-hover')} onClick={() => onCreate('template')}>
                              <FilePlus02 className='mr-2 h-4 w-4 shrink-0 text-text-secondary' />
                              {t('app.newApp.startFromTemplate')}
                            </div>
                          </div>
                          <div className='border-t border-divider-regular p-1'>
                            <div className={cn('flex cursor-pointer items-center rounded-lg px-3 py-[6px] font-normal text-text-secondary hover:bg-state-base-hover')} onClick={() => onCreate('dsl')}>
                              <FileArrow01 className='mr-2 h-4 w-4 shrink-0 text-text-secondary' />
                              {t('app.importDSL')}
                            </div>
                          </div>
                        </MenuItems>
                      </Transition>
                    </>
                  )}
                </Menu>
              )}
            </MenuItems>
          </>
        )}
      </Menu>
    </div>
  )
}

export default NavSelector