import { Page } from '../types/api';
import { getCmsSettings } from '../tools/settings';

export default class PageTree {
  items: Page[] = [];

  constructor(pageList: Page[]) {
    this.items = this.sortPages(this.parsePageTree(pageList));
  }

  parsePageTree(pageList: Page[]): Page[] {
    // TODO remove path property as we can use .url instead
    pageList.forEach((page) => (page.path = page.parentId ? '/' + page.name : ''));
    const getSubPagesById = (id: string) => pageList.filter((page) => page.parentId === id);

    pageList.forEach((page) => {
      page.children = getSubPagesById(page.id);

      page.children.forEach((subPage: Page) => {
        subPage.path = page.path + subPage.path;
        // Mark subpages as child so we can remove them later.
        subPage.isChild = true;
      });

      page.path = page.path || '/';
    });

    return pageList.filter((page) => !page.isChild);
  }

  sortPages(pageTree: Page[]): Page[] {
    const sortByName = (a: Page, b: Page) => {
      if (a.name < b.name) {
        return -1;
      }
      if (a.name > b.name) {
        return 1;
      }
      return 0;
    };

    pageTree = pageTree.sort(sortByName);

    if (getCmsSettings().pageTreeSorting) {
      pageTree = pageTree.sort(getCmsSettings().pageTreeSorting);
    }

    // Apply recursive sorting on sub arrays.
    pageTree.forEach((page) => {
      if (page.children && page.children.length) {
        page.children = this.sortPages(page.children);
      }
    });

    return pageTree;
  }
}