import { KeyboardKey, KeyboardModifier } from '@/Services/IOService'
import { WebApplication } from '@/UIModels/Application'
import { AppState } from '@/UIModels/AppState'
import { PANEL_NAME_NOTES } from '@/Constants'
import { PrefKey } from '@standardnotes/snjs'
import { observer } from 'mobx-react-lite'
import { FunctionComponent } from 'preact'
import { useCallback, useEffect, useRef, useState } from 'preact/hooks'
import { NoAccountWarning } from '@/Components/NoAccountWarning'
import { NotesList } from '@/Components/NotesList'
import { NotesListOptionsMenu } from '@/Components/NotesList/NotesListOptionsMenu'
import { SearchOptions } from '@/Components/SearchOptions'
import { PanelSide, ResizeFinishCallback, PanelResizer, PanelResizeType } from '@/Components/PanelResizer'
import { Disclosure, DisclosureButton, DisclosurePanel } from '@reach/disclosure'
import { useCloseOnBlur } from '@/Hooks/useCloseOnBlur'
import { isStateDealloced } from '@/UIModels/AppState/AbstractState'

type Props = {
  application: WebApplication
  appState: AppState
}

export const NotesView: FunctionComponent<Props> = observer(({ application, appState }: Props) => {
  if (isStateDealloced(appState)) {
    return null
  }

  const notesViewPanelRef = useRef<HTMLDivElement>(null)
  const displayOptionsMenuRef = useRef<HTMLDivElement>(null)

  const {
    completedFullSync,
    displayOptions,
    noteFilterText,
    optionsSubtitle,
    panelTitle,
    renderedNotes,
    selectedNotes,
    searchBarElement,
    paginate,
    panelWidth,
  } = appState.notesView

  const createNewNote = useCallback(() => appState.notesView.createNewNote, [appState])
  const onFilterEnter = useCallback(() => appState.notesView.onFilterEnter, [appState])
  const clearFilterText = useCallback(() => appState.notesView.clearFilterText, [appState])
  const setNoteFilterText = useCallback((text: string) => appState.notesView.setNoteFilterText(text), [appState])
  const selectNextNote = useCallback(() => appState.notesView.selectNextNote, [appState])
  const selectPreviousNote = useCallback(() => appState.notesView.selectPreviousNote, [appState])

  const [showDisplayOptionsMenu, setShowDisplayOptionsMenu] = useState(false)
  const [focusedSearch, setFocusedSearch] = useState(false)

  const [closeDisplayOptMenuOnBlur] = useCloseOnBlur(displayOptionsMenuRef, setShowDisplayOptionsMenu)

  useEffect(() => {
    /**
     * In the browser we're not allowed to override cmd/ctrl + n, so we have to
     * use Control modifier as well. These rules don't apply to desktop, but
     * probably better to be consistent.
     */
    const newNoteKeyObserver = application.io.addKeyObserver({
      key: 'n',
      modifiers: [KeyboardModifier.Meta, KeyboardModifier.Ctrl],
      onKeyDown: (event) => {
        event.preventDefault()
        createNewNote()
      },
    })

    const nextNoteKeyObserver = application.io.addKeyObserver({
      key: KeyboardKey.Down,
      elements: [document.body, ...(searchBarElement ? [searchBarElement] : [])],
      onKeyDown: () => {
        if (searchBarElement === document.activeElement) {
          searchBarElement?.blur()
        }
        selectNextNote()
      },
    })

    const previousNoteKeyObserver = application.io.addKeyObserver({
      key: KeyboardKey.Up,
      element: document.body,
      onKeyDown: () => {
        selectPreviousNote()
      },
    })

    const searchKeyObserver = application.io.addKeyObserver({
      key: 'f',
      modifiers: [KeyboardModifier.Meta, KeyboardModifier.Shift],
      onKeyDown: () => {
        if (searchBarElement) {
          searchBarElement.focus()
        }
      },
    })

    return () => {
      newNoteKeyObserver()
      nextNoteKeyObserver()
      previousNoteKeyObserver()
      searchKeyObserver()
    }
  }, [application, createNewNote, selectPreviousNote, searchBarElement, selectNextNote])

  const onNoteFilterTextChange = useCallback(
    (e: Event) => {
      setNoteFilterText((e.target as HTMLInputElement).value)
    },
    [setNoteFilterText],
  )

  const onSearchFocused = useCallback(() => setFocusedSearch(true), [])
  const onSearchBlurred = useCallback(() => setFocusedSearch(false), [])

  const onNoteFilterKeyUp = useCallback(
    (e: KeyboardEvent) => {
      if (e.key === KeyboardKey.Enter) {
        onFilterEnter()
      }
    },
    [onFilterEnter],
  )

  const panelResizeFinishCallback: ResizeFinishCallback = useCallback(
    (width, _lastLeft, _isMaxWidth, isCollapsed) => {
      application.setPreference(PrefKey.NotesPanelWidth, width).catch(console.error)
      appState.noteTags.reloadTagsContainerMaxWidth()
      appState.panelDidResize(PANEL_NAME_NOTES, isCollapsed)
    },
    [appState, application],
  )

  const panelWidthEventCallback = useCallback(() => {
    appState.noteTags.reloadTagsContainerMaxWidth()
  }, [appState])

  const toggleDisplayOptionsMenu = useCallback(() => {
    setShowDisplayOptionsMenu(!showDisplayOptionsMenu)
  }, [showDisplayOptionsMenu])

  return (
    <div
      id="notes-column"
      className="sn-component section notes app-column app-column-second"
      aria-label="Notes"
      ref={notesViewPanelRef}
    >
      <div className="content">
        <div id="notes-title-bar" className="section-title-bar">
          <div id="notes-title-bar-container">
            <div className="section-title-bar-header">
              <div className="sk-h2 font-semibold title">{panelTitle}</div>
              <button
                className="sk-button contrast wide"
                title="Create a new note in the selected tag"
                aria-label="Create new note"
                onClick={() => createNewNote()}
              >
                <div className="sk-label">
                  <i className="ion-plus add-button" aria-hidden></i>
                </div>
              </button>
            </div>
            <div className="filter-section" role="search">
              <div>
                <input
                  type="text"
                  id="search-bar"
                  className="filter-bar"
                  placeholder="Search"
                  title="Searches notes in the currently selected tag"
                  value={noteFilterText}
                  onChange={onNoteFilterTextChange}
                  onKeyUp={onNoteFilterKeyUp}
                  onFocus={onSearchFocused}
                  onBlur={onSearchBlurred}
                  autocomplete="off"
                />
                {noteFilterText && (
                  <button onClick={clearFilterText} aria-role="button" id="search-clear-button">
                    ✕
                  </button>
                )}
              </div>

              {(focusedSearch || noteFilterText) && (
                <div className="animate-fade-from-top">
                  <SearchOptions application={application} appState={appState} />
                </div>
              )}
            </div>
            <NoAccountWarning appState={appState} />
          </div>
          <div id="notes-menu-bar" className="sn-component" ref={displayOptionsMenuRef}>
            <div className="sk-app-bar no-edges">
              <div className="left">
                <Disclosure open={showDisplayOptionsMenu} onChange={toggleDisplayOptionsMenu}>
                  <DisclosureButton
                    className={`sk-app-bar-item bg-contrast color-text border-0 focus:shadow-none ${
                      showDisplayOptionsMenu ? 'selected' : ''
                    }`}
                    onBlur={closeDisplayOptMenuOnBlur}
                  >
                    <div className="sk-app-bar-item-column">
                      <div className="sk-label">Options</div>
                    </div>
                    <div className="sk-app-bar-item-column">
                      <div className="sk-sublabel">{optionsSubtitle}</div>
                    </div>
                  </DisclosureButton>
                  <DisclosurePanel onBlur={closeDisplayOptMenuOnBlur}>
                    {showDisplayOptionsMenu && (
                      <NotesListOptionsMenu
                        application={application}
                        closeDisplayOptionsMenu={toggleDisplayOptionsMenu}
                        closeOnBlur={closeDisplayOptMenuOnBlur}
                        isOpen={showDisplayOptionsMenu}
                      />
                    )}
                  </DisclosurePanel>
                </Disclosure>
              </div>
            </div>
          </div>
        </div>
        {completedFullSync && !renderedNotes.length ? <p className="empty-notes-list faded">No notes.</p> : null}
        {!completedFullSync && !renderedNotes.length ? (
          <p className="empty-notes-list faded">Loading notes...</p>
        ) : null}
        {renderedNotes.length ? (
          <NotesList
            notes={renderedNotes}
            selectedNotes={selectedNotes}
            application={application}
            appState={appState}
            displayOptions={displayOptions}
            paginate={paginate}
          />
        ) : null}
      </div>
      {notesViewPanelRef.current && (
        <PanelResizer
          collapsable={true}
          hoverable={true}
          defaultWidth={300}
          panel={notesViewPanelRef.current}
          side={PanelSide.Right}
          type={PanelResizeType.WidthOnly}
          resizeFinishCallback={panelResizeFinishCallback}
          widthEventCallback={panelWidthEventCallback}
          width={panelWidth}
          left={0}
        />
      )}
    </div>
  )
})