import type { InsertResult } from '@admin/utils/editor/insert-result'
import type { EditorView } from '@codemirror/view'
import { findMarkdownLinkRange } from '@admin/utils/editor/find-markdown-link-range'

export function removeMarkdownLinkAtCursor(
  view: EditorView | null,
  currentValue: string
): InsertResult {
  if (!view) {
    return {
      newValue: currentValue,
      newCursorPos: currentValue.length
    }
  }

  const markdown = view.state.doc.toString()
  const { from, to } = view.state.selection.main
  const existingLink = findMarkdownLinkRange(markdown, from, to)

  if (!existingLink) {
    return {
      newValue: markdown,
      newCursorPos: to
    }
  }

  const nextCursorPos = existingLink.start + existingLink.text.length

  view.dispatch({
    changes: {
      from: existingLink.start,
      to: existingLink.end,
      insert: existingLink.text
    },
    selection: { anchor: nextCursorPos }
  })

  return {
    newValue:
      markdown.slice(0, existingLink.start) + existingLink.text + markdown.slice(existingLink.end),
    newCursorPos: nextCursorPos
  }
}