/**
 * Copyright (c) 2026 Niolla
 * All rights reserved.
 *
 * This source code is proprietary and confidential.
 * Unauthorized copying, modification, distribution, or use
 * of this file, via any medium, is strictly prohibited.
 */

// app/utills/excel/confirmOrder.excel.js

const ExcelJS = require("exceljs");

/**
 * Generate Excel template buffer
 */
exports.generateTemplate = async (items) => {
  const workbook = new ExcelJS.Workbook();
  const sheet = workbook.addWorksheet("Confirm Order");

  sheet.columns = [
    { header: "Item ID", key: "id", width: 25 },
    { header: "Item Name", key: "item_name", width: 30 },
    { header: "Original Quantity", key: "quantity", width: 20 },
    { header: "Confirmed Quantity", key: "confirmed_quantity", width: 20 },
  ];

  const headerRow = sheet.getRow(1);

  headerRow.eachCell((cell) => {
    cell.fill = {
      type: "pattern",
      pattern: "solid",
      fgColor: { argb: "1F4E78" }, 
    };

    cell.font = {
      bold: true,
      color: { argb: "FFFFFF" }, 
    };

    cell.alignment = {
      vertical: "middle",
      horizontal: "center",
    };

    cell.border = {
      top: { style: "thin" },
      left: { style: "thin" },
      bottom: { style: "thin" },
      right: { style: "thin" },
    };
  });

  items.forEach((item) => {
    sheet.addRow({
      id: item.data_id,
      item_name: item.item_name,
      quantity: item.quantity,
      confirmed_quantity: item.quantity,
    });
  });

  return workbook.xlsx.writeBuffer();
};

/**
 * Parse uploaded Excel buffer
 */
exports.parseExcel = async (buffer) => {
  const workbook = new ExcelJS.Workbook();
  await workbook.xlsx.load(buffer);

  const sheet = workbook.getWorksheet("Confirm Order");
  if (!sheet) throw new Error("Invalid sheet name");

  const confirmedMap = new Map();

  sheet.eachRow((row, rowNumber) => {
    if (rowNumber === 1) return;

    const itemId = row.getCell(1).value;
    const confirmedQty = Number(row.getCell(4).value);

    if (itemId) {
      confirmedMap.set(itemId, confirmedQty);
    }
  });

  return confirmedMap;
};