import type { Priority } from '@prosekit/core'
import { union, withPriority, type Union } from '@prosekit/core'

import { defineParagraphCommands, type ParagraphCommandsExtension } from './paragraph-commands.ts'
import { defineParagraphKeymap } from './paragraph-keymap.ts'
import { defineParagraphSpec, type ParagraphSpecExtension } from './paragraph-spec.ts'

/**
 * @internal
 */
export type ParagraphExtension = Union<[ParagraphSpecExtension, ParagraphCommandsExtension]>

/**
 * Defines a paragraph node.
 *
 * The paragraph node spec has the highest priority, because it should be the
 * default block node for most cases.
 */
export function defineParagraph(): ParagraphExtension {
  return union(
    withPriority(defineParagraphSpec(), 4 satisfies typeof Priority.highest),
    defineParagraphCommands(),
    defineParagraphKeymap(),
  )
}