import type { Node as ProseMirrorNode, NodeType } from '@tiptap/pm/model'
import { Fragment, Slice } from '@tiptap/pm/model'
import { TextSelection } from '@tiptap/pm/state'
import { canSplit } from '@tiptap/pm/transform'

import { getNodeType } from '../helpers/getNodeType.js'
import { getSplittedAttributes } from '../helpers/getSplittedAttributes.js'
import type { RawCommands } from '../types.js'

declare module '@tiptap/core' {
  interface Commands<ReturnType> {
    splitListItem: {
      /**
       * Splits one list item into two list items.
       * @param typeOrName The type or name of the node.
       * @param overrideAttrs The attributes to ensure on the new node.
       * @example editor.commands.splitListItem('listItem')
       */
      splitListItem: (typeOrName: string | NodeType, overrideAttrs?: Record<string, any>) => ReturnType
    }
  }
}

export const splitListItem: RawCommands['splitListItem'] =
  (typeOrName, overrideAttrs = {}) =>
  ({ tr, state, dispatch, editor }) => {
    const type = getNodeType(typeOrName, state.schema)
    const { $from, $to } = state.selection

    // @ts-ignore
    // eslint-disable-next-line
    const node: ProseMirrorNode = state.selection.node

    if ((node && node.isBlock) || $from.depth < 2 || !$from.sameParent($to)) {
      return false
    }

    const grandParent = $from.node(-1)

    if (grandParent.type !== type) {
      return false
    }

    const extensionAttributes = editor.extensionManager.attributes

    if ($from.parent.content.size === 0 && $from.node(-1).childCount === $from.indexAfter(-1)) {
      // In an empty block. If this is a nested list, the wrapping
      // list item should be split. Otherwise, bail out and let next
      // command handle lifting.
      if ($from.depth === 2 || $from.node(-3).type !== type || $from.index(-2) !== $from.node(-2).childCount - 1) {
        return false
      }

      if (dispatch) {
        let wrap = Fragment.empty
        // eslint-disable-next-line
        const depthBefore = $from.index(-1) ? 1 : $from.index(-2) ? 2 : 3

        // Build a fragment containing empty versions of the structure
        // from the outer list item to the parent node of the cursor
        for (let d = $from.depth - depthBefore; d >= $from.depth - 3; d -= 1) {
          wrap = Fragment.from($from.node(d).copy(wrap))
        }

        const depthAfter =
          // eslint-disable-next-line no-nested-ternary
          $from.indexAfter(-1) < $from.node(-2).childCount
            ? 1
            : $from.indexAfter(-2) < $from.node(-3).childCount
              ? 2
              : 3

        // Add a second list item with an empty default start node
        const newNextTypeAttributes = {
          ...getSplittedAttributes(extensionAttributes, $from.node().type.name, $from.node().attrs),
          ...overrideAttrs,
        }
        const nextType = type.contentMatch.defaultType?.createAndFill(newNextTypeAttributes) || undefined

        wrap = wrap.append(Fragment.from(type.createAndFill(null, nextType) || undefined))

        const start = $from.before($from.depth - (depthBefore - 1))

        tr.replace(start, $from.after(-depthAfter), new Slice(wrap, 4 - depthBefore, 0))

        let sel = -1

        tr.doc.nodesBetween(start, tr.doc.content.size, (n, pos) => {
          if (sel > -1) {
            return false
          }

          if (n.isTextblock && n.content.size === 0) {
            sel = pos + 1
          }
        })

        if (sel > -1) {
          tr.setSelection(TextSelection.near(tr.doc.resolve(sel)))
        }

        tr.scrollIntoView()
      }

      return true
    }

    const nextType = $to.pos === $from.end() ? grandParent.contentMatchAt(0).defaultType : null

    const newTypeAttributes = {
      ...getSplittedAttributes(extensionAttributes, grandParent.type.name, grandParent.attrs),
      ...overrideAttrs,
    }
    const newNextTypeAttributes = {
      ...getSplittedAttributes(extensionAttributes, $from.node().type.name, $from.node().attrs),
      ...overrideAttrs,
    }

    tr.delete($from.pos, $to.pos)

    const types = nextType
      ? [
          { type, attrs: newTypeAttributes },
          { type: nextType, attrs: newNextTypeAttributes },
        ]
      : [{ type, attrs: newTypeAttributes }]

    if (!canSplit(tr.doc, $from.pos, 2)) {
      return false
    }

    if (dispatch) {
      const { selection, storedMarks } = state
      const { splittableMarks } = editor.extensionManager
      const marks = storedMarks || (selection.$to.parentOffset && selection.$from.marks())

      tr.split($from.pos, 2, types).scrollIntoView()

      if (!marks || !dispatch) {
        return true
      }

      const filteredMarks = marks.filter(mark => splittableMarks.includes(mark.type.name))

      tr.ensureMarks(filteredMarks)
    }

    return true
  }