import { BadRequestError } from "#root/errors/index.js";
import db from "#root/db.js";
import xlsx from "xlsx";

const sheetName = "Отчеты";

/** @type {xlsx.ParsingOptions} */
const xlsxParseOptions = {
  sheets: sheetName,
  cellHTML: false,
  cellFormula: false,
  cellDates: true,
  dateNF: "yyyy-mm-dd"
};

/**
 * URL: /api/reports_excel_file_parse
 * Method: POST
 * Description: Читает Excel файл отчетов и возвращает его в формате JSON. Принимает на вход файл
 *              отчетов в формате Excel.
 *
 * @type {HTTPRouteHandler}
 */
export default async (ctx) => {
  const { res } = ctx;

  if (!ctx.data) throw new BadRequestError("Cannot proceed uploaded file");

  const [, files] = ctx.data;
  const excelFilePath = files?.report?.at(0)?.filepath;

  /** @type {{ markedReports: ReportModel[], reports: ReportModel[] }} */
  const ret = { reports: [], markedReports: [] };

  let foundEqupments = 0;

  ctx.res.res.setHeaders(
    new Headers({
      Connection: "keep-alive",
      "Cache-Control": "no-cache",
      "Content-Type": "text/event-stream"
    })
  );

  if (excelFilePath) {
    const workbook = xlsx.readFile(excelFilePath, xlsxParseOptions);
    const sheet = workbook.Sheets[sheetName];

    if (!sheet) throw new Error("Invalid reports workbook.", { cause: { statusCode: 400 } });

    const data = xlsx.utils.sheet_to_json(sheet, { raw: false, blankrows: true });

    for (let i = 0; i < data.length; i++) {
      const cols = Object.keys(data[i]);

      if (i === 0) continue;

      /** Несинхронизированные помеченные отчеты */
      if ("__EMPTY_3" in data[i] && data[i]["__EMPTY_3"] === "r") {
        ret.markedReports.push({
          date: data[i][cols[0]],
          equipment: data[i][cols[1]],
          reason_call: data[i][cols[3]].split("\r\r\n")[1] || "",
          job_description: data[i][cols[4]].split("\r\r\n")[1] || "",
          root_cause: data[i]["__EMPTY_2"] || "",
          applicantName: data[i][cols[3]].split("\r\r\n")[0] || "",
          executorNames: data[i][cols[4]].split("\r\r\n")[0] || ""
        });

        continue;
      }

      /** Остальные отчеты */
      ret.reports.push({
        date: data[i][cols[0]],
        equipment: data[i][cols[1]],
        reason_call: parseReasonCallAndJobDesc(data[i][cols[3]]),
        job_description: parseReasonCallAndJobDesc(data[i][cols[4]]),
        root_cause: data[i]["__EMPTY_2"] || "",
        applicantName: parseNames(data[i][cols[3]]),
        executorNames: parseNames(data[i][cols[4]])
      });
    }

    /** @param {ReportModel} report */
    const checkReportAssigments = async (report) => {
      const equipment = await db
        .request()
        .query(`select id, name from dbo.asu_system_api_subsystemlist where name like N'%${report.equipment}%';`);

      if (equipment.recordset.length !== 0) foundEqupments++;

      res.sendSSEJson(report, "reportParseProgress");

      return equipment;
    };

    console.log("Total reports:", ret.reports.concat(ret.markedReports).length);
    await Promise.allSettled(ret.reports.concat(ret.markedReports).map((r) => checkReportAssigments(r)));
    ctx.res.sendSSEJson({ foundEqupments }, "reportParseDone");
    console.log("Parse done");
  } else {
    throw new BadRequestError();
  }

  res.res.end();
};

function parseReasonCallAndJobDesc(str = "") {
  const splitted = splitLongSpacedSentence(str);
  if (splitted.length > 1) return splitted.slice(1).join(" ");
  return str.split("\r\n").slice(1).join(" ");
}

function parseNames(str = "") {
  const splitted = splitLongSpacedSentence(str);
  if (splitted.length > 1) return splitted[0];
  return str.split("\r\n")[0];
}

/**
 * @param {string} str
 * @param {number} min
 */
function splitLongSpacedSentence(str, min = 5) {
  return str.split(new RegExp(`\\s{${min},}`));
}