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

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

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

const resolveUserName = async (userId, fallback = '') => {
  if (!userId) return fallback;
  const user = await User.findById(userId).select('name uniqueCode').lean();
  return {
    fullName: user?.name || fallback,
    userCode: user?.uniqueCode || ''
  };
};

const sendTemplateSms = async ({
  templateKey,
  receiver,
  userId = null,
  subject,
  body,
  relatedEvent,
  slotValues = {}
}) => {
  const resolvedUserId = userId || await resolveUserIdByPhone(receiver);
  const { templateId, variables, enabled, text: templateText } = await getSmsTemplate(templateKey);
  const isBypass = await isSmsBypassNumber(receiver);
  if (enabled === false && !isBypass) {
    logger.info(`[SMS] Template ${templateKey} is disabled. Skipping SMS send to ${receiver}.`);
    return { success: true, skipped: true, reason: 'template_disabled' };
  }

  const paramsContext = {
    phoneNumber: receiver,
    mobile: receiver,
    ...slotValues
  };

  const renderedExactBody = renderSmsText(templateText, variables, paramsContext);
  const finalBody = (renderedExactBody && renderedExactBody.trim()) ? renderedExactBody.trim() : (body || subject || 'پیامک');

  return recordAndSend({
    userId: resolvedUserId,
    channel: 'sms',
    subject,
    body: finalBody,
    relatedEvent,
    sendFn: () => sendSingleSms(receiver, templateId, buildSmsParameters(variables, paramsContext))
  });
};

const sendAccountCredentialsSms = async ({
  receiver,
  username,
  password,
  userId = null,
  subject,
  body,
  relatedEvent,
  templateKey = 'accountCreated',
  userCode = ''
}) => {
  const resolvedUserId = userId || await resolveUserIdByPhone(receiver);
  let fullName = '';
  let code = userCode;
  if (resolvedUserId) {
    const profile = await resolveUserName(resolvedUserId, username);
    fullName = profile.fullName;
    code = code || profile.userCode;
  }
  return sendTemplateSms({
    templateKey,
    receiver,
    userId: resolvedUserId,
    subject,
    body,
    relatedEvent,
    slotValues: {
      username,
      password,
      fullName: fullName || username,
      name: fullName || username,
      userCode: code
    }
  });
};

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

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

const sendClassRegisteredSms = async (receiver, className, userId = null, extraContext = {}) => {
  const resolvedUserId = userId || await resolveUserIdByPhone(receiver);
  let fullName = extraContext.fullName || '';
  if (!fullName && resolvedUserId) {
    const profile = await resolveUserName(resolvedUserId);
    fullName = profile.fullName;
  }
  return sendTemplateSms({
    templateKey: 'classRegistered',
    receiver,
    userId: resolvedUserId,
    subject: 'ثبت‌نام در کلاس',
    body: `ثبت‌نام شما در کلاس «${className}» انجام شد.`,
    relatedEvent: 'user.enrolled',
    slotValues: {
      className,
      courseName: extraContext.courseName || className,
      fullName: fullName || 'کارآموز',
      classStartDate: extraContext.classStartDate || '',
      classDays: extraContext.classDays || '',
      courseTime: extraContext.courseTime || '',
      classCode: extraContext.classCode || '',
      ...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 profile = await resolveUserName(resolvedUserId);
    fullName = profile.fullName;
  }
  return sendTemplateSms({
    templateKey: 'classReminder',
    receiver,
    userId: resolvedUserId,
    subject: 'یادآوری کلاس',
    body: `یادآوری کلاس «${className}» ساعت ${time} — مکان: ${place || '-'}`,
    relatedEvent: 'session.reminder',
    slotValues: {
      className,
      topic: extraContext.topic || className,
      courseName: extraContext.courseName || className,
      time,
      classTime: extraContext.classTime || extraContext.courseTime || extraContext.time || time || '',
      sessionDate: extraContext.sessionDate || '',
      place: place || '-',
      fullName: fullName || 'کارآموز',
      classStartDate: extraContext.classStartDate || '',
      classDays: extraContext.classDays || '',
      courseTime: extraContext.courseTime || extraContext.classTime || extraContext.time || time || '',
      classCode: extraContext.classCode || '',
      ...extraContext
    }
  });
};

const { formatPrice } = require('../paymentAmount');

const sendInvoiceCreatedSms = async (receiver, payload, userId = null) => {
  const resolvedUserId = userId || await resolveUserIdByPhone(receiver);
  const data = typeof payload === 'object' && payload !== null ? payload : { amount: payload };
  const fullNameLabel = data.fullName || 'کارآموز';
  const amountLabel = data.amount != null ? formatPrice(data.amount) : '';
  const courseLabel = data.course || '-';

  return sendTemplateSms({
    templateKey: 'invoiceCreated',
    receiver,
    userId: resolvedUserId,
    subject: 'ایجاد صورتحساب',
    body: `کارآموز عزیز، ${fullNameLabel}، یک صورتحساب به مبلغ ${amountLabel} تومان بابت دوره «${courseLabel}» برای شما ایجاد شد.`,
    relatedEvent: 'payment.created',
    slotValues: {
      fullName: fullNameLabel,
      amount: amountLabel,
      course: courseLabel,
      classStartDate: data.classStartDate || '',
      classDays: data.classDays || '',
      courseTime: data.courseTime || '',
      invoiceCode: data.invoiceCode || ''
    }
  });
};

const sendPaymentStatusChangedSms = async (receiver, payload, userId = null) => {
  const data = payload || {};
  const amountLabel = data.amount != null ? formatPrice(data.amount) : '';
  return sendTemplateSms({
    templateKey: 'paymentStatusChanged',
    receiver,
    userId,
    subject: 'تغییر وضعیت پرداخت',
    body: `وضعیت صورتحساب شما به «${data.statusLabel || data.status || '-'}» تغییر کرد.`,
    relatedEvent: 'payment.status_changed',
    slotValues: {
      fullName: data.fullName || 'کارآموز',
      status: data.statusLabel || data.status || '-',
      amount: amountLabel,
      invoiceCode: data.invoiceCode || '',
      course: data.course || '-'
    }
  });
};

const sendPaymentReminderSms = async (receiver, payload, userId = null) => {
  const data = payload || {};
  const amountLabel = data.amount != null ? formatPrice(data.amount) : '-';
  return sendTemplateSms({
    templateKey: 'paymentReminder',
    receiver,
    userId,
    subject: 'یادآوری سررسید پرداخت',
    body: `یادآوری: مبلغ ${amountLabel} تومان تا ${data.dueDate || '-'} سررسید دارد.`,
    relatedEvent: 'payment.reminder_due',
    slotValues: {
      fullName: data.fullName || 'کارآموز',
      amount: data.amount != null ? formatPrice(data.amount) : '',
      dueDate: data.dueDate || '',
      invoiceCode: data.invoiceCode || '',
      course: data.course || '-'
    }
  });
};

const sendTransactionRecordedSms = async (receiver, payload, userId = null) => {
  const data = payload || {};
  const amountLabel = data.amount != null ? formatPrice(data.amount) : '-';
  return sendTemplateSms({
    templateKey: 'transactionRecorded',
    receiver,
    userId,
    subject: 'ثبت تراکنش',
    body: `تراکنش به مبلغ ${amountLabel} تومان ثبت شد.`,
    relatedEvent: 'payment.transaction_added',
    slotValues: {
      fullName: data.fullName || 'کارآموز',
      amount: data.amount != null ? formatPrice(data.amount) : '',
      invoiceCode: data.invoiceCode || '',
      transactionCode: data.transactionCode || '',
      receiptNumber: data.receiptNumber || ''
    }
  });
};

const sendSessionCancelledSms = async (receiver, payload, userId = null) => {
  const data = payload || {};
  return sendTemplateSms({
    templateKey: 'sessionCancelled',
    receiver,
    userId,
    subject: 'لغو جلسه',
    body: `جلسه «${data.topic || data.className || 'کلاس'}» لغو شد.`,
    relatedEvent: 'session.cancelled',
    slotValues: {
      fullName: data.fullName || 'کارآموز',
      className: data.className || '-',
      topic: data.topic || '-',
      sessionDate: data.sessionDate || '',
      reason: data.reason || '-',
      classCode: data.classCode || ''
    }
  });
};

const sendSessionHoldingSms = async (receiver, payload, userId = null) => {
  const data = payload || {};
  return sendTemplateSms({
    templateKey: 'sessionHolding',
    receiver,
    userId,
    subject: 'برگزاری جلسه طبق برنامه',
    body: `جلسه «${data.topic || data.className || 'کلاس'}» کلاس ${data.className || ''} در تاریخ ${data.sessionDate || '-'} و ساعت ${data.classTime || data.time || '-'} طبق برنامه برگزار خواهد شد.`,
    relatedEvent: 'session.holding',
    slotValues: {
      fullName: data.fullName || 'کارآموز',
      topic: data.topic || '-',
      className: data.className || '-',
      sessionDate: data.sessionDate || '',
      classTime: data.classTime || data.time || '',
      courseName: data.courseName || data.className || '-',
      classCode: data.classCode || '',
      place: data.place || '-'
    }
  });
};

const sendClassRequestApprovedSms = async (receiver, payload, userId = null) => {
  const data = payload || {};
  return sendTemplateSms({
    templateKey: 'classRequestApproved',
    receiver,
    userId,
    subject: 'تأیید درخواست تشکیل کلاس',
    body: `درخواست تشکیل کلاس «${data.courseName || '-'}» تأیید شد.`,
    relatedEvent: 'class_request.approved',
    slotValues: {
      fullName: data.fullName || 'کارآموز',
      courseName: data.courseName || '-',
      classCode: data.classCode || ''
    }
  });
};

const sendClassRequestRejectedSms = async (receiver, payload, userId = null) => {
  const data = payload || {};
  return sendTemplateSms({
    templateKey: 'classRequestRejected',
    receiver,
    userId,
    subject: 'رد درخواست ثبت‌نام',
    body: `درخواست شما برای «${data.courseName || '-'}» رد شد.`,
    relatedEvent: 'class_request.rejected',
    slotValues: {
      fullName: data.fullName || 'کارآموز',
      courseName: data.courseName || '-',
      reason: data.reason || '-',
      registrationCode: data.registrationCode || ''
    }
  });
};

const sendPendingRegistrationSms = async (receiver, payload, userId = null) => {
  const data = payload || {};
  return sendTemplateSms({
    templateKey: 'pendingRegistration',
    receiver,
    userId,
    subject: 'دریافت درخواست ثبت‌نام',
    body: `درخواست ثبت‌نام شما در «${data.className || '-'}» دریافت شد.`,
    relatedEvent: 'pending.registration_received',
    slotValues: {
      fullName: data.fullName || 'کارآموز',
      className: data.className || '-',
      registrationCode: data.registrationCode || ''
    }
  });
};

const sendCertificateIssuedSms = async (receiver, payload, userId = null) => {
  const data = payload || {};
  return sendTemplateSms({
    templateKey: 'certificateIssued',
    receiver,
    userId,
    subject: 'صدور گواهینامه',
    body: `گواهینامه «${data.certificateTitle || '-'}» برای شما صادر شد.`,
    relatedEvent: 'certificate.issued',
    slotValues: {
      fullName: data.fullName || 'کارآموز',
      certificateTitle: data.certificateTitle || '-',
      certificateCode: data.certificateCode || '',
      courseName: data.courseName || '-'
    }
  });
};

const sendClassPlanProfessorSms = async (receiver, payload, userId = null) => {
  const data = payload || {};
  return sendTemplateSms({
    templateKey: 'classPlanProfessor',
    receiver,
    userId,
    subject: 'برنامه کلاس به استاد',
    body: `استاد ${data.professorName || ''}، برنامه کلاس ${data.className || ''}: ${data.classDays || ''}، ${data.classTimes || ''} از ${data.classStartDate || ''} الی ${data.classEndDate || ''}`,
    relatedEvent: 'class.plan_to_professor',
    slotValues: {
      professorName: data.professorName || 'استاد',
      className: data.className || '-',
      classDays: data.classDays || '',
      classTimes: data.classTimes || '',
      classStartDate: data.classStartDate || '',
      classEndDate: data.classEndDate || '',
      phoneNumber: receiver
    }
  });
};

module.exports = {
  sendAccountCreatedSms,
  sendPasswordResetSms,
  sendClassRegisteredSms,
  sendClassReminderSms,
  sendInvoiceCreatedSms,
  sendPaymentStatusChangedSms,
  sendPaymentReminderSms,
  sendTransactionRecordedSms,
  sendSessionCancelledSms,
  sendSessionHoldingSms,
  sendClassRequestApprovedSms,
  sendClassRequestRejectedSms,
  sendPendingRegistrationSms,
  sendCertificateIssuedSms,
  sendClassPlanProfessorSms
};