// /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 sendAccountCredentialsSms = async ({
  receiver,
  username,
  password,
  userId = null,
  subject,
  body,
  relatedEvent
}) => {
  const resolvedUserId = userId || await resolveUserIdByPhone(receiver);
  let fullName = '';
  if (resolvedUserId) {
    const user = await User.findById(resolvedUserId).select('name').lean();
    if (user?.name) fullName = user.name;
  }
  const { templateId, variables } = await getSmsTemplate('accountCreated');
  return recordAndSend({
    userId: resolvedUserId,
    channel: 'sms',
    subject,
    body,
    relatedEvent,
    sendFn: () => sendSingleSms(receiver, templateId, buildSmsParameters(variables, {
      username,
      password,
      fullName: fullName || username,
      name: fullName || username,
      phoneNumber: receiver,
      mobile: receiver
    }))
  });
};

const sendAccountCreatedSms = async (receiver, username, password, userId = null) => {
  return sendAccountCredentialsSms({
    receiver,
    username,
    password,
    userId,
    subject: 'ایجاد حساب کاربری',
    body: `حساب کاربری شما ایجاد شد. نام کاربری: ${username}`,
    relatedEvent: 'user.created'
  });
};

const sendPasswordResetSms = async (receiver, username, password, userId = null) => {
  return sendAccountCredentialsSms({
    receiver,
    username,
    password,
    userId,
    subject: 'بازنشانی رمز عبور',
    body: `رمز عبور شما بازنشانی شد. نام کاربری: ${username}`,
    relatedEvent: 'user.password_reset'
  });
};

const sendClassRegisteredSms = async (receiver, className, userId = null, extraContext = {}) => {
  const resolvedUserId = userId || await resolveUserIdByPhone(receiver);
  let fullName = extraContext.fullName || '';
  if (!fullName && resolvedUserId) {
    const user = await User.findById(resolvedUserId).select('name').lean();
    if (user?.name) fullName = user.name;
  }
  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,
      courseName: extraContext.courseName || className,
      fullName: fullName || 'کارآموز',
      phoneNumber: receiver,
      mobile: receiver,
      classStartDate: extraContext.classStartDate || '',
      classDays: extraContext.classDays || '',
      courseTime: extraContext.courseTime || '',
      ...extraContext
    }))
  });
};

const sendClassReminderSms = async (receiver, className, time, place = '', userId = null, extraContext = {}) => {
  const resolvedUserId = userId || await resolveUserIdByPhone(receiver);
  let fullName = extraContext.fullName || '';
  if (!fullName && resolvedUserId) {
    const user = await User.findById(resolvedUserId).select('name').lean();
    if (user?.name) fullName = user.name;
  }
  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,
      courseName: extraContext.courseName || className,
      time,
      place: place || '-',
      fullName: fullName || 'کارآموز',
      phoneNumber: receiver,
      mobile: receiver,
      classStartDate: extraContext.classStartDate || '',
      classDays: extraContext.classDays || '',
      courseTime: extraContext.courseTime || extraContext.time || time || '',
      ...extraContext
    }))
  });
};

const sendInvoiceCreatedSms = async (receiver, payload, userId = null) => {
  const resolvedUserId = userId || await resolveUserIdByPhone(receiver);
  const { templateId, variables } = await getSmsTemplate('invoiceCreated');

  let fullName = '';
  let amount = '';
  let course = '';
  let classStartDate = '';
  let classDays = '';
  let courseTime = '';

  if (typeof payload === 'object' && payload !== null) {
    fullName = payload.fullName || '';
    amount = payload.amount != null ? String(payload.amount) : '';
    course = payload.course || '';
    classStartDate = payload.classStartDate || '';
    classDays = payload.classDays || '';
    courseTime = payload.courseTime || '';
  } else {
    amount = String(payload || '');
  }

  const amountLabel = String(amount);
  const courseLabel = course || '-';
  const fullNameLabel = fullName || 'کارآموز';

  return recordAndSend({
    userId: resolvedUserId,
    channel: 'sms',
    subject: 'ایجاد صورتحساب',
    body: `کارآموز عزیز، ${fullNameLabel}، یک صورتحساب به مبلغ ${amountLabel} تومان بابت دوره «${courseLabel}» برای شما ایجاد شد.`,
    relatedEvent: 'payment.created',
    sendFn: () => sendSingleSms(receiver, templateId, buildSmsParameters(variables, {
      fullName: fullNameLabel,
      amount: amountLabel,
      course: courseLabel,
      phoneNumber: receiver,
      mobile: receiver,
      classStartDate,
      classDays,
      courseTime
    }))
  });
};

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