import type { Editor } from '@tiptap/core'
import { detectTextDirection, inferLangFromUrl } from '@/lib/clip/rtl-content'

const RTL_BLOCK_TYPES = new Set([
  'clipArticle',
  'bulletList',
  'orderedList',
  'listItem',
  'heading',
  'paragraph',
  'blockquote',
])

function nodeShouldBeRtl(
  node: { type: { name: string }; textContent: string; attrs: { dir?: string | null } },
  urlIsRtl: boolean,
): boolean {
  if (node.attrs.dir === 'rtl') return false
  if (urlIsRtl) return true
  const text = node.textContent || ''
  if (!text.trim()) return false
  return detectTextDirection(text) === 'rtl'
}

/**
 * Applique dir="rtl" explicitement sur les nœuds TipTap (titres, listes, paragraphes).
 * Basé sur la doc TipTap setTextDirection — évite textDirection:'auto' (bug listes #7338).
 * @see https://tiptap.dev/docs/editor/api/commands/nodes-and-marks/set-text-direction
 * @see https://github.com/ueberdosis/tiptap/issues/7338
 */
export function applyClipRtlDirection(
  editor: Editor,
  options?: { sourceUrl?: string | null },
): boolean {
  if (!editor || editor.isDestroyed) return false

  const urlIsRtl = Boolean(options?.sourceUrl && inferLangFromUrl(options.sourceUrl))
  const ranges: Array<{ from: number; to: number }> = []

  editor.state.doc.descendants((node, pos) => {
    if (node.type.name === 'clipArticle') {
      ranges.push({ from: pos, to: pos + node.nodeSize })
    }
  })

  if (ranges.length === 0) {
    editor.state.doc.descendants((node, pos) => {
      if (node.isText || !RTL_BLOCK_TYPES.has(node.type.name)) return
      if (!nodeShouldBeRtl(node, urlIsRtl)) return
      ranges.push({ from: pos, to: pos + node.nodeSize })
    })
  }

  if (ranges.length === 0) return false

  return editor
    .chain()
    .command(({ tr, state, dispatch }) => {
      let changed = false
      for (const { from, to } of ranges) {
        state.doc.nodesBetween(from, to, (node, pos) => {
          if (node.isText || node.attrs.dir === 'rtl') return
          if (!RTL_BLOCK_TYPES.has(node.type.name)) return
          tr.setNodeMarkup(pos, undefined, { ...node.attrs, dir: 'rtl' })
          changed = true
        })
      }
      if (dispatch && changed) dispatch(tr)
      return changed
    })
    .run()
}