import {
  Document,
  INumberingOptions,
  IPropertiesOptions,
  ISectionOptions,
  Packer,
  SectionType,
} from 'docx';
import { Node as ProsemirrorNode } from 'prosemirror-model';
import { IFootnotes, SerializationState } from './types';

export function createShortId() {
  return Math.random().toString(36).slice(2, 11);
}

export function buildDoc(state: SerializationState, opts?: IPropertiesOptions): Document {
  let sections = state?.sections?.length
    ? state.sections.map((section) => ({
        properties: section.config.properties || {
          type: SectionType.CONTINUOUS,
        },
        headers: section.config.headers,
        footers: section.config.footers,
        children: section.children,
      }))
    : undefined;
  if (!sections) {
    sections = [
      {
        headers: undefined,
        footers: undefined,
        properties: {
          type: SectionType.CONTINUOUS,
        },
        children: state?.children || [],
      },
    ];
  }

  const doc = new Document({
    footnotes: state.footnotes,
    numbering: {
      config: state.numbering,
    },
    sections,
    ...(opts || {}),
  });
  return doc;
}

/**
 *  @deprecated - use `buildDoc` instead
 *  Creates a docx document from the given state.
 * */
export function createDocFromState(state: {
  numbering: INumberingOptions['config'];
  children: ISectionOptions['children'];
  footnotes?: IFootnotes;
}) {
  return buildDoc({
    numbering: state.numbering,
    sections: [
      {
        config: {},
        children: state.children,
      },
    ],
    footnotes: state.footnotes,
  });
}

export async function writeDocx(
  doc: Document,
  /**
   * @deprecated use `.then()` or `await` instead
   */
  write?: ((buffer: Buffer) => void) | ((buffer: Buffer) => Promise<void>),
) {
  const buffer = await Packer.toBuffer(doc);
  await write?.(buffer);
  return buffer;
}

export function getLatexFromNode(node: ProsemirrorNode): string {
  let math = '';
  node.forEach((child) => {
    if (child.isText) math += child.text;
    // TODO: improve this as we may have other things in the future
  });
  return math;
}