// /utils/senders/smsMessages.js
'use strict';

const { sendSingleSms } = require('./sms.base');
const { recordAndSend } = require('./notificationRecorder');
const { getSmsTemplate } = require('../../components/settings/settingService');
const { buildSmsParameters } = require('../../components/settings/smsTemplates');
const User = require('../../components/users/userModel');

const resolveUserIdByPhone = async (phoneNumber) => {
  if (!phoneNumber) return null;
  const user = await User.findOne({ phoneNumber: String(phoneNumber) }).select('_id').lean();
  return user?._id || null;
};

const sendAccountCreatedSms = async (receiver, username, password, userId = null) => {
  const resolvedUserId = userId || await resolveUserIdByPhone(receiver);
  const { templateId, variables } = await getSmsTemplate('accountCreated');
  return recordAndSend({
    userId: resolvedUserId,
    channel: 'sms',
    subject: 'ایجاد حساب کاربری',
    body: `حساب کاربری شما ایجاد شد. نام کاربری: ${username}`,
    relatedEvent: 'user.created',
    sendFn: () => sendSingleSms(receiver, templateId, buildSmsParameters(variables, {
      username,
      password
    }))
  });
};

const sendClassRegisteredSms = async (receiver, className, userId = null) => {
  const resolvedUserId = userId || await resolveUserIdByPhone(receiver);
  const { templateId, variables } = await getSmsTemplate('classRegistered');
  return recordAndSend({
    userId: resolvedUserId,
    channel: 'sms',
    subject: 'ثبت‌نام در کلاس',
    body: `ثبت‌نام شما در کلاس «${className}» انجام شد.`,
    relatedEvent: 'user.enrolled',
    sendFn: () => sendSingleSms(receiver, templateId, buildSmsParameters(variables, {
      className
    }))
  });
};

const sendClassReminderSms = async (receiver, className, time, place = '', userId = null) => {
  const resolvedUserId = userId || await resolveUserIdByPhone(receiver);
  const { templateId, variables } = await getSmsTemplate('classReminder');
  return recordAndSend({
    userId: resolvedUserId,
    channel: 'sms',
    subject: 'یادآوری کلاس',
    body: `یادآوری کلاس «${className}» ساعت ${time} — مکان: ${place || '-'}`,
    relatedEvent: 'session.reminder',
    sendFn: () => sendSingleSms(receiver, templateId, buildSmsParameters(variables, {
      className,
      time,
      place: place || '-'
    }))
  });
};

const sendInvoiceCreatedSms = async (receiver, payloadOrAmount, userId = null, extraCourse = '') => {
  const isObject = typeof payloadOrAmount === 'object' && payloadOrAmount !== null;
  const resolvedUserId = (isObject && payloadOrAmount.userId)
    ? payloadOrAmount.userId
    : (userId || await resolveUserIdByPhone(receiver));

  let fullName = '';
  let amount = 0;
  let course = '';

  if (isObject) {
    fullName = payloadOrAmount.fullName || '';
    amount = payloadOrAmount.amount ?? 0;
    course = payloadOrAmount.course || '';
  } else {
    amount = payloadOrAmount;
    course = typeof extraCourse === 'string' ? extraCourse : '';
  }

  if (!fullName && resolvedUserId) {
    const user = await User.findById(resolvedUserId).select('name').lean();
    fullName = user?.name || '';
  }

  const { templateId, variables } = await getSmsTemplate('invoiceCreated');
  const amountLabel = String(amount);
  const fullNameLabel = String(fullName || '').trim();
  const courseLabel = String(course || '').trim();

  return recordAndSend({
    userId: resolvedUserId,
    channel: 'sms',
    subject: 'ایجاد صورتحساب',
    body: `صورتحساب جدید به مبلغ ${amountLabel} تومان بابت دوره «${courseLabel || '-'}» برای ${fullNameLabel || 'کارآموز'} صادر شد.`,
    relatedEvent: 'payment.created',
    sendFn: () => sendSingleSms(receiver, templateId, buildSmsParameters(variables, {
      fullName: fullNameLabel,
      amount: amountLabel,
      course: courseLabel
    }))
  });
};

module.exports = {
  sendAccountCreatedSms,
  sendClassRegisteredSms,
  sendClassReminderSms,
  sendInvoiceCreatedSms
};