import * as cheerio from "cheerio";
const titles = [
  "class",
  "date",
  "lesson",
  "teacher",
  "changedTeacher",
  "subject",
  "room",
  "type",
  "notes",
];

export function parseSubstitutionPlan(html) {
  const infos = {};
  const $ = cheerio.load(html);

  // Extract the date, weekday and a/b week from the title
  const title = $(".mon_title").text().split(" ");
  const rawDate = title[0];
  const date = rawDate
    .split(".")
    .reverse()
    .map((e) => e.padStart(2, 0))
    .join("-");
  infos.date = new Date(date).setUTCHours(0, 0, 0, 0);
  infos.week = title[3];

  // Get the export timestamp
  const rawTimestamp = $(".mon_head td")
    .text()
    .split("Stand: ")[1]
    .replace(/[\s\n]*$/g, "");
  const exportDate = rawTimestamp.split(" ")[0].split(".").reverse().join("-");
  const timestamp = exportDate + " " + rawTimestamp.split(" ")[1];
  infos.updatedAt = new Date(timestamp).getTime();

  const data = [];
  const subsitutionTable = $("table.mon_list tr.list");
  // Loop through each table row
  subsitutionTable.each((_rowcnt, row) => {
    const rowData = {};

    // Find the columns and ignore empty ones
    const columns = $(row).find("td");
    if (columns.text() == "") return;
    // Ignore columns that include "Keine Vertretungen"
    // to have an empty array if there are no substitutions
    if (columns.text().includes("Keine Vertretungen")) return;

    columns.each((columncnt, column) => {
      const text = $(column).text();
      // Clean the text by removing new lines, tabs, ...
      var cleantext = text.replace(/^\n\s*/g, "").replace(/\s*$/, "");
      if (cleantext == "" || cleantext == "---") cleantext = null;

      const columntitle = titles[columncnt];
      rowData[columntitle] = cleantext;
    });

    data.push(rowData);
  });

  infos.changes = data;
  return infos;
}