import type { Editor } from '@tiptap/core';
import { useEditorState } from '@tiptap/react';
import { useRef } from 'react';
import { useTranslation } from 'react-i18next';

import type { PluginBlockOption, SectionStyleOption } from '../plugins/use-pond-plugins';

import { LinkMenu } from './LinkMenu';
import { PluginBlockMenu } from './PluginBlockMenu';
import { SectionStyleMenu } from './SectionStyleMenu';

interface ToolbarProps {
  editor: Editor;
  /** Section styles offered by the pond's active plugins (issue #75); the
   * section group is omitted while empty. */
  sectionStyles?: SectionStyleOption[];
  /** Block types offered by the pond's active code plugins (issue #76); the
   * insert group is omitted while empty. */
  pluginBlocks?: PluginBlockOption[];
}

function ToolbarButton({
  label,
  active,
  disabled,
  onClick,
  children,
}: {
  label: string;
  active?: boolean;
  disabled?: boolean;
  onClick: () => void;
  children: React.ReactNode;
}): React.JSX.Element {
  return (
    <button
      type="button"
      className={active ? 'toolbar-button toolbar-button--active' : 'toolbar-button'}
      title={label}
      aria-label={label}
      aria-pressed={active ?? false}
      disabled={disabled}
      // Toolbar clicks must not steal focus/selection from the editor.
      onMouseDown={(event) => event.preventDefault()}
      onClick={onClick}
    >
      {children}
    </button>
  );
}

/** File-picker path into the same async upload as paste/drop (issue #28) —
 * a hidden native file input triggered by a normal toolbar button, since
 * that is the only way to open the OS file dialog from a click handler. */
function ImageInsertButton({
  editor,
  label,
}: {
  editor: Editor;
  label: string;
}): React.JSX.Element {
  const inputRef = useRef<HTMLInputElement>(null);
  return (
    <>
      <ToolbarButton label={label} onClick={() => inputRef.current?.click()}>
        🖼
      </ToolbarButton>
      <input
        ref={inputRef}
        type="file"
        accept="image/*"
        hidden
        onChange={(event) => {
          const file = event.target.files?.[0];
          if (file) editor.chain().focus().insertImageFile(file).run();
          event.target.value = '';
        }}
      />
    </>
  );
}

/** Arrow-key navigation between toolbar controls (#164, role="toolbar"
 * convention). Native selects keep their own arrow-key handling. */
function onToolbarArrowKey(event: React.KeyboardEvent<HTMLDivElement>): void {
  if (event.key !== 'ArrowRight' && event.key !== 'ArrowLeft') return;
  const target = event.target as HTMLElement;
  if (target.tagName === 'SELECT' || target.tagName === 'INPUT') return;
  const controls = [
    ...event.currentTarget.querySelectorAll<HTMLElement>('button:not([disabled]), select'),
  ];
  const index = controls.indexOf(target);
  if (index === -1) return;
  event.preventDefault();
  const step = event.key === 'ArrowRight' ? 1 : -1;
  controls[(index + step + controls.length) % controls.length]?.focus();
}

/** Keyboard-accessible toolbar for the page editor (issue #25). Table row/
 * column controls stay visible but disabled outside a table, so the
 * toolbar's layout and tab order never shift while typing. */
export function Toolbar({
  editor,
  sectionStyles = [],
  pluginBlocks = [],
}: ToolbarProps): React.JSX.Element {
  const { t } = useTranslation('editor');
  const state = useEditorState({
    editor,
    selector: ({ editor: e }) => ({
      paragraph: e.isActive('paragraph'),
      heading1: e.isActive('heading', { level: 1 }),
      heading2: e.isActive('heading', { level: 2 }),
      heading3: e.isActive('heading', { level: 3 }),
      heading4: e.isActive('heading', { level: 4 }),
      bold: e.isActive('bold'),
      italic: e.isActive('italic'),
      code: e.isActive('code'),
      strikethrough: e.isActive('strikethrough'),
      bulletList: e.isActive('bullet_list'),
      orderedList: e.isActive('ordered_list'),
      taskList: e.isActive('task_list'),
      blockquote: e.isActive('blockquote'),
      codeBlock: e.isActive('code_block'),
      canAddRow: e.can().addRowAfter(),
      canDeleteRow: e.can().deleteRow(),
      canAddColumn: e.can().addColumnAfter(),
      canDeleteColumn: e.can().deleteColumn(),
      canDeleteTable: e.can().deleteTable(),
      canMergeCells: e.can().mergeCells(),
      canSplitCell: e.can().splitCell(),
      canToggleHeaderRow: e.can().toggleHeaderRow(),
      canUndo: e.can().undo(),
      canRedo: e.can().redo(),
    }),
  });

  return (
    <div
      className="editor-toolbar"
      role="toolbar"
      aria-label={t('toolbar.label')}
      onKeyDown={onToolbarArrowKey}
    >
      <div className="editor-toolbar__group">
        <ToolbarButton
          label={t('toolbar.paragraph')}
          active={state.paragraph}
          onClick={() => editor.chain().focus().setParagraph().run()}
        >
          P
        </ToolbarButton>
        {([1, 2, 3, 4] as const).map((level) => (
          <ToolbarButton
            key={level}
            label={t(`toolbar.heading${level}` as const)}
            active={state[`heading${level}` as const]}
            onClick={() => editor.chain().focus().toggleHeading(level).run()}
          >
            H{level}
          </ToolbarButton>
        ))}
      </div>

      <div className="editor-toolbar__group">
        <ToolbarButton
          label={t('toolbar.bold')}
          active={state.bold}
          onClick={() => editor.chain().focus().toggleBold().run()}
        >
          <strong>B</strong>
        </ToolbarButton>
        <ToolbarButton
          label={t('toolbar.italic')}
          active={state.italic}
          onClick={() => editor.chain().focus().toggleItalic().run()}
        >
          <em>I</em>
        </ToolbarButton>
        <ToolbarButton
          label={t('toolbar.code')}
          active={state.code}
          onClick={() => editor.chain().focus().toggleCode().run()}
        >
          {'</>'}
        </ToolbarButton>
        <ToolbarButton
          label={t('toolbar.strikethrough')}
          active={state.strikethrough}
          onClick={() => editor.chain().focus().toggleStrikethrough().run()}
        >
          <s>S</s>
        </ToolbarButton>
        <LinkMenu editor={editor} />
      </div>

      <div className="editor-toolbar__group">
        <ToolbarButton
          label={t('toolbar.bulletList')}
          active={state.bulletList}
          onClick={() => editor.chain().focus().toggleBulletList().run()}
        >
          •
        </ToolbarButton>
        <ToolbarButton
          label={t('toolbar.orderedList')}
          active={state.orderedList}
          onClick={() => editor.chain().focus().toggleOrderedList().run()}
        >
          1.
        </ToolbarButton>
        <ToolbarButton
          label={t('toolbar.taskList')}
          active={state.taskList}
          onClick={() => editor.chain().focus().toggleTaskList().run()}
        >
          ☑
        </ToolbarButton>
      </div>

      <div className="editor-toolbar__group">
        <ToolbarButton
          label={t('toolbar.blockquote')}
          active={state.blockquote}
          onClick={() => editor.chain().focus().toggleBlockquote().run()}
        >
          ❝
        </ToolbarButton>
        <ToolbarButton
          label={t('toolbar.codeBlock')}
          active={state.codeBlock}
          onClick={() => editor.chain().focus().toggleCodeBlock().run()}
        >
          {'{ }'}
        </ToolbarButton>
        <ToolbarButton
          label={t('toolbar.horizontalRule')}
          onClick={() => editor.chain().focus().setHorizontalRule().run()}
        >
          ―
        </ToolbarButton>
        <ImageInsertButton editor={editor} label={t('toolbar.image')} />
      </div>

      <SectionStyleMenu editor={editor} options={sectionStyles} />

      <PluginBlockMenu editor={editor} options={pluginBlocks} />

      <div className="editor-toolbar__group">
        <ToolbarButton
          label={t('toolbar.table.insert')}
          onClick={() => editor.chain().focus().insertTable().run()}
        >
          ⊞
        </ToolbarButton>
        <ToolbarButton
          label={t('toolbar.table.addColumnBefore')}
          disabled={!state.canAddColumn}
          onClick={() => editor.chain().focus().addColumnBefore().run()}
        >
          ⊞←
        </ToolbarButton>
        <ToolbarButton
          label={t('toolbar.table.addColumnAfter')}
          disabled={!state.canAddColumn}
          onClick={() => editor.chain().focus().addColumnAfter().run()}
        >
          ⊞→
        </ToolbarButton>
        <ToolbarButton
          label={t('toolbar.table.deleteColumn')}
          disabled={!state.canDeleteColumn}
          onClick={() => editor.chain().focus().deleteColumn().run()}
        >
          {/* Axis stripes + the × delete marker (already established by
              deleteTable's ⊠): the earlier ⊟↕/⊟↔ double arrows read as
              "resize/expand", not "delete" (issue #336). */}
          ▥×
        </ToolbarButton>
        <ToolbarButton
          label={t('toolbar.table.addRowBefore')}
          disabled={!state.canAddRow}
          onClick={() => editor.chain().focus().addRowBefore().run()}
        >
          ⊞↑
        </ToolbarButton>
        <ToolbarButton
          label={t('toolbar.table.addRowAfter')}
          disabled={!state.canAddRow}
          onClick={() => editor.chain().focus().addRowAfter().run()}
        >
          ⊞↓
        </ToolbarButton>
        <ToolbarButton
          label={t('toolbar.table.deleteRow')}
          disabled={!state.canDeleteRow}
          onClick={() => editor.chain().focus().deleteRow().run()}
        >
          ▤×
        </ToolbarButton>
        <ToolbarButton
          label={t('toolbar.table.mergeCells')}
          disabled={!state.canMergeCells}
          onClick={() => editor.chain().focus().mergeCells().run()}
        >
          {/* Arrows collapsing onto / leaving a cell border: merge removes
              the border between selected cells, split restores it. */}
          →|←
        </ToolbarButton>
        <ToolbarButton
          label={t('toolbar.table.splitCell')}
          disabled={!state.canSplitCell}
          onClick={() => editor.chain().focus().splitCell().run()}
        >
          ←|→
        </ToolbarButton>
        <ToolbarButton
          label={t('toolbar.table.toggleHeaderRow')}
          disabled={!state.canToggleHeaderRow}
          onClick={() => editor.chain().focus().toggleHeaderRow().run()}
        >
          ⊤
        </ToolbarButton>
        <ToolbarButton
          label={t('toolbar.table.deleteTable')}
          disabled={!state.canDeleteTable}
          onClick={() => editor.chain().focus().deleteTable().run()}
        >
          ⊠
        </ToolbarButton>
      </div>

      <div className="editor-toolbar__group">
        <ToolbarButton
          label={t('toolbar.undo')}
          disabled={!state.canUndo}
          onClick={() => editor.chain().focus().undo().run()}
        >
          ↺
        </ToolbarButton>
        <ToolbarButton
          label={t('toolbar.redo')}
          disabled={!state.canRedo}
          onClick={() => editor.chain().focus().redo().run()}
        >
          ↻
        </ToolbarButton>
      </div>
    </div>
  );
}