invoice.gs

// enable drive api service
// manually set a time-driven trigger(the alarm icon) that runs monthly after 25th evening,

function entrypoint() {
  return main();
}

function deIndent(str) {
  return str.replace(/^[ \t]+/gm, "");
}

function dateWithOrdinalSuffix(date) {
  const day = date.getDate();
  let suffix = "th";
  if (day % 10 === 1 && day !== 11) {
    suffix = "st";
  } else if (day % 10 === 2 && day !== 12) {
    suffix = "nd";
  } else if (day % 10 === 3 && day !== 13) {
    suffix = "rd";
  }

  return day + suffix + Utilities.formatDate(date, "Asia/Kolkata", " MMMM, yyyy");
}

function getConsultancyFeesText(date) {
  const firstDay = new Date(date.getFullYear(), date.getMonth(), 1)
  const lastDay = new Date(date.getFullYear(), date.getMonth() + 1, 0)
  return `Consultancy fees for ${dateWithOrdinalSuffix(firstDay)} to ${dateWithOrdinalSuffix(lastDay)}`
}

function tgMessage(message) {
  const botToken = ""
  const chatId = ""
  UrlFetchApp.fetch(
    `https://api.telegram.org/bot${botToken}/sendMessage`,
    {
      method: 'post',
      payload: {
        chat_id: chatId,
        text: message
      }
    }
  );
}

function fetchWithAuth(url) {
  return UrlFetchApp.fetch(url, {
    method: "GET",
    headers: { "Authorization": "Bearer " + ScriptApp.getOAuthToken() },
    muteHttpExceptions: false
  })
}

function main() {
  const date = new Date();
  const monthYear = Utilities.formatDate(date, "Asia/Kolkata", "MMMM yyyy");

  try {
    const invoiceFolderName = "Invoices"
    const signatureImageFileId = "" // drive file id of signature image keep it under 200px in png format
    const sender = "[email protected]";
    const recieverName = "Finance Manager"

    const data = {
      "H4": Utilities.formatDate(date, "Asia/Kolkata", "dd/MM/yyyy"), // date
      "A12": getConsultancyFeesText(date),
      "H12": 0, // salary
      "B16": "", // name, also used in email body
      "B17": "", //address
      "B18": "", // pan
      "D22": "", // account holder
      "D23": "", // ac number
      "D24": "", // bank name
      "D25": "", // ifsc
      "D26": "", // account type
    }

    const invoiceFolder = DriveApp.getFoldersByName(invoiceFolderName).next();

    // Get invoice thread for current month
    const threads = GmailApp.search(`from:${sender} subject:Invoice | Consultation Charges | ${monthYear}`);
    if (threads.length === 0) {
      tgMessage(`🔥 Invoice processing for ${monthYear} failed: invoice email not found`)
    };
    const thread = threads[0];

    // Save file to drive
    const templateFileId = Drive.Files.insert(
      {
        title: monthYear,
        mimeType: MimeType.GOOGLE_SHEETS,
        parents: [{ id: invoiceFolder.getId() }]
      },
      thread.getMessages()[0].getAttachments()[0]
    ).id;
    const templateFile = DriveApp.getFileById(templateFileId)

    // Open and Edit Google Sheet
    const sheet = SpreadsheetApp.openById(templateFile.getId()).getActiveSheet();

    Object.entries(data).forEach(([key, value]) => {
      sheet.getRange(key).setValue(value);
    });

    // fix ac getting cutoff
    sheet.getRange("D23").setNumberFormat("@");

    // fill attendance; deprecated 
    /* let range = sheet.getRange("B31:F52");
    let values = range.getValues();
    for (let i = 0; i < values.length; i += 4) {
      for (let j = 0; j < values[i].length; j++) {
        if (values[i][j] !== "" && values[i+1][j] == "") {
          values[i+1][j] = "WFH";
        }
      }
    }
    range.setValues(values); */

    // Add signature
    sheet.insertImage(DriveApp.getFileById(signatureImageFileId).getBlob(), 2, 31);

    SpreadsheetApp.flush();

    // Convert back to Excel
    const templateFileRes = fetchWithAuth(`https://docs.google.com/spreadsheets/d/${templateFile.getId()}/export?format=xlsx`)
    const finalFile = invoiceFolder.createFile(templateFileRes.getBlob().setName(monthYear + '.xlsx'));

    // Delete the temporary Google Sheet
    templateFile.setTrashed(true)

    const message_body = deIndent(
      `Hi ${recieverName},

      Please find my invoice for the month of ${monthYear} attached.

      Thanks & Regards,
      ${data.B16}`
    )

    // Draft Reply
    thread.createDraftReply(message_body, { attachments: [finalFile.getBlob()] });

    tgMessage(`🚀 Invoice processed for ${monthYear} successfully: ${finalFile.getUrl()}`)
  } catch (err) {
    tgMessage(`🔥 Invoice processing for ${monthYear} failed: ${err}`)
    throw err
  }
}