import { onRequest } from "firebase-functions/v2/https";
import { Request } from "firebase-functions/v2/https";
import * as admin from 'firebase-admin';
import * as express from "express";
import * as logger from "firebase-functions/logger";
import { onDocumentCreated } from "firebase-functions/firestore";
import * as os from 'os';
import * as path from 'path';
import * as fs from 'fs';
import * as https from 'https';
import cors from 'cors';
import axios from "axios";
import { getStorage } from 'firebase-admin/storage';
const formData = require('form-data');
const Mailgun = require('mailgun.js');
const { convert } = require('html-to-text');
const twilio = require('twilio');


if (!admin.apps.length) {
  admin.initializeApp();
}

const corsHandler = cors({ origin: true });

export const sendEmailWithAttachment = onRequest({
  region: '#{SERVICES_RGN}#'
}, async (request: Request, response: express.Response) => {
  return corsHandler(request, response, async () => {
    try {
      const { toAddress, subject, message, fileUrl, fileName } = request.body;

      if (!toAddress || !subject || !message || !fileUrl) {
        response.status(400).json({
          error: 'Missing required fields (toAddress, subject, message, fileUrl)'
        });
        return;
      }
      const tempFilePath = path.join(os.tmpdir(), fileName || 'attachment.pdf');
      await new Promise<void>((resolve, reject) => {
        const file = fs.createWriteStream(tempFilePath);
        https.get(fileUrl, (res) => {
          res.pipe(file);
          file.on('finish', () => {
            file.close();
            resolve();
          });
        }).on('error', (err) => {
          fs.unlink(tempFilePath, () => { });
          reject(err);
        });
      });

      const mailgun = new Mailgun(formData);
      const client = mailgun.client({ username: 'api', key: process.env.MAILGUN_API_KEY });

      const options = {
        wordwrap: 130,
      };
      const textMessage = convert(message, options);
      const fileBuffer = fs.readFileSync(tempFilePath);
      const attachmentFilename = fileName || path.basename(fileUrl.split('?')[0]);

      const data = {
        from: process.env.MAILGUN_FROM_ADDRESS,
        to: toAddress,
        subject: subject,
        text: textMessage,
        html: message,
        attachment: {
          data: fileBuffer,
          filename: attachmentFilename,
          contentType: 'application/pdf',
        }
      };

      const result = await client.messages.create(process.env.MAILGUN_SERVER, data);
      fs.unlinkSync(tempFilePath);

      logger.info('Email with attachment from URL sent successfully');
      response.json({ success: true, result });
    } catch (error) {
      logger.error('Error sending email with attachment from URL:', error);
      response.status(500).json({ success: false, error: error instanceof Error ? error.message : String(error) });
    }
  });
});

export const accessFile = onRequest({
  region: '#{SERVICES_RGN}#'
}, async (request: Request, response: express.Response) => {
  return corsHandler(request, response, async () => {

    try {
      const filePath = request.query.path as string;
      if (!filePath) {
        response.status(400).send('File path is required');
        return;
      }

      const expirationMs = 60 * 60 * 1000;

      const bucket = getStorage().bucket();
      const file = bucket.file(filePath);

      const [exists] = await file.exists();
      if (!exists) {
        response.status(404).send('File not found');
        return;
      }

      const [signedUrl] = await file.getSignedUrl({
        action: 'read',
        expires: Date.now() + expirationMs,
        responseDisposition: `attachment; filename="${path.basename(filePath)}"`,
      });

      response.redirect(signedUrl);
      logger.info(`File access redirect for ${filePath}`);
    } catch (error) {
      logger.error('Error accessing file:', error);
      response.status(500).send('Error accessing file');
    }
  });
});

export const sendEmailMessage = onRequest({
  region: '#{SERVICES_RGN}#'
}, (request: Request, response: express.Response) => {
  return corsHandler(request, response, async () => {

    const mailgun = new Mailgun(formData);
    const mailGunClient = mailgun.client({ username: 'api', key: process.env.MAILGUN_API_KEY });

    const toAddress = request.body.toAddress;
    const subject = request.body.subject;
    const message = request.body.message;
    const options = {
      wordwrap: 130,
    };

    const textMessage = convert(message, options);
    mailGunClient.messages.create(process.env.MAILGUN_SERVER, {
      from: process.env.MAILGUN_FROM_ADDRESS,
      to: toAddress,
      subject: subject,
      text: textMessage,
      html: message
    }).then((res: any) => {
      logger.info(res);
      response.send(res);
    }).catch((err: any) => {
      logger.error(err);
      response.send(err);
    });
  });
});

export const sendSMSMessage = onRequest({
  region: '#{SERVICES_RGN}#'
}, (request: Request, response: express.Response) => {
  return corsHandler(request, response, async () => {

    const client = twilio(process.env.TWILIO_ACCOUNT_SID, process.env.TWILIO_AUTH_TOKEN);
    const { to, body } = request.body;
    client.messages
      .create({
        body: body,
        from: process.env.TWILIO_PHONE_NUMBER,
        to: to
      })
      .then((message: any) => {
        logger.info('SMS sent successfully:', message.sid);
        response.json({ success: true, messageId: message.sid });
      })
      .catch((error: any) => {
        logger.error('Error sending SMS:', error);
        response.status(500).json({ success: false, error: error.message });
      });
  });
});

interface Invitation {
  email: string;
  phoneNumber: string;
  gymName: string;
  invitedByName: string;
}

export const notifyInvitation = onDocumentCreated({
  document: 'notifications/{notificationId}',
  region: '#{SERVICES_RGN}#'
}, async (event: any) => {

  const invitation = event.data?.data() as Invitation;
  const invitationId = event.params.invitationId;

  if (!invitation) {
    console.error('Invitation data is missing.');
    return null;
  }

  try {
    const userQuery = await admin
      .firestore()
      .collection('users')
      .where('email', '==', invitation.email)
      .where('phoneNumber', '==', invitation.phoneNumber)
      .limit(1)
      .get();

    if (userQuery.empty) {
      console.log(
        `User not found for email: ${invitation.email} and phone: ${invitation.phoneNumber}.`
      );
      return null;
    }

    const user = userQuery.docs[0].data();
    const fcmToken = user.fcmToken;

    if (!fcmToken) {
      console.log(`FCM token not found for user: ${invitation.email}.`);
      return null;
    }

    const message: admin.messaging.Message = {
      notification: {
        title: 'New Gym Invitation',
        body: `${invitation.invitedByName} has invited you to join ${invitation.gymName}`,
      },
      data: {
        type: 'invitation',
        invitationId: invitationId,
        gymName: invitation.gymName,
        senderName: invitation.invitedByName,
      },
      android: {
        priority: 'high',
        notification: {
          channelId: 'invitations_channel',
          priority: 'high',
          defaultSound: true,
          defaultVibrateTimings: true,
          icon: '@mipmap/ic_launcher',
          clickAction: 'FLUTTER_NOTIFICATION_CLICK',
        },
      },
      token: fcmToken,
    };

    await admin.messaging().send(message);
    console.log(`Invitation notification sent to ${invitation.email}.`);
    return null;
  } catch (error) {
    console.error('Error sending invitation notification:', error);
    return null;
  }
});

export const createCashfreeOrder = onRequest({
  region: '#{SERVICES_RGN}#'
}, async (request: Request, response: express.Response) => {

  return corsHandler(request, response, async () => {
    try {
      const authHeader = request.headers.authorization;
      if (!authHeader || !authHeader.startsWith('Bearer ')) {
        response.status(401).json({ error: 'Unauthorized' });
        return;
      }

      const idToken = authHeader.split('Bearer ')[1];
      const decodedToken = await admin.auth().verifyIdToken(idToken);
      const uid = decodedToken.uid;

      const {
        amount,
        customerName,
        customerEmail,
        customerPhone,
        productInfo
      } = request.body;

      if (!amount || !customerEmail || !customerPhone) {
        response.status(400).json({ error: 'Missing required fields' });
        return;
      }

      const clientId = process.env.CASHFREE_CLIENT_ID;
      const clientSecret = process.env.CASHFREE_CLIENT_SECRET;
      const isTest = true;

      const apiUrl = isTest
        ? 'https://sandbox.cashfree.com/pg/orders'
        : 'https://api.cashfree.com/pg/orders';

      const orderId = `order_${Date.now()}_${uid.substring(0, 6)}`;

      const cashfreeResponse = await axios.post(
        apiUrl,
        {
          order_id: orderId,
          order_amount: amount,
          order_currency: 'INR',
          customer_details: {
            customer_id: uid,
            customer_name: customerName || 'Fitlien User',
            customer_email: customerEmail,
            customer_phone: customerPhone
          },
          order_meta: {
            return_url: `https://fitlien.com/payment/status?order_id={order_id}`,
            // notify_url: `https://$filien.web.app/verifyCashfreePayment`
          },
          order_note: productInfo || 'Fitlien Membership'
        },
        {
          headers: {
            'x-api-version': '2022-09-01',
            'x-client-id': clientId,
            'x-client-secret': clientSecret,
            'Content-Type': 'application/json'
          }
        }
      );

      await admin.firestore().collection('payment_orders').doc(orderId).set({
        userId: uid,
        amount: amount,
        customerEmail: customerEmail,
        customerPhone: customerPhone,
        orderStatus: 'CREATED',
        paymentGateway: 'Cashfree',
        createdAt: new Date(),
        ...cashfreeResponse.data
      });

      response.json({
        order_id: cashfreeResponse.data.order_id,
        payment_session_id: cashfreeResponse.data.payment_session_id
      });

      logger.info(`Cashfree order created: ${orderId}`);
    } catch (error: any) {
      logger.error('Cashfree order creation error:', error);
      response.status(500).json({
        error: 'Failed to create payment order',
        details: error.response?.data || error.message
      });
    }
  });
});

export const verifyCashfreePayment = onRequest({
  region: '#{SERVICES_RGN}#'
}, async (request: Request, response: express.Response) => {
  return corsHandler(request, response, async () => {

    try {
      const orderId = request.body.order_id || request.query.order_id;

      if (!orderId) {
        response.status(400).json({ error: 'Order ID is required' });
        return;
      }

      const clientId = process.env.CASHFREE_CLIENT_ID;
      const clientSecret = process.env.CASHFREE_CLIENT_SECRET;
      const isTest = process.env.CASHFREE_ENVIRONMENT !== 'production';

      const apiUrl = isTest
        ? `https://sandbox.cashfree.com/pg/orders/${orderId}`
        : `https://api.cashfree.com/pg/orders/${orderId}`;

      const cashfreeResponse = await axios.get(
        apiUrl,
        {
          headers: {
            'x-api-version': '2022-09-01',
            'x-client-id': clientId,
            'x-client-secret': clientSecret
          }
        }
      );

      await admin.firestore().collection('payment_orders').doc(orderId).update({
        orderStatus: cashfreeResponse.data.order_status,
        paymentDetails: cashfreeResponse.data,
        updatedAt: new Date()
      });

      if (request.headers['x-webhook-source'] === 'cashfree') {
        response.status(200).send('OK');
        return;
      }

      response.json({
        status: cashfreeResponse.data.order_status,
        paymentDetails: cashfreeResponse.data
      });

      logger.info(`Cashfree payment verified: ${orderId}`);
    } catch (error: any) {
      logger.error('Cashfree payment verification error:', error);
      response.status(500).json({
        error: 'Failed to verify payment status',
        details: error.response?.data || error.message
      });
    }
  });
});

export const getPlacesAutocomplete = onRequest({
  region: '#{SERVICES_RGN}#'
}, async (request: Request, response: express.Response) => {
  return corsHandler(request, response, async () => {
    try {
      const { input, location, radius, types, components, sessiontoken } = request.query;

      if (!input) {
        response.status(400).json({
          error: 'Input parameter is required for autocomplete'
        });
        return;
      }

      const apiKey = process.env.GOOGLE_MAPS_API_KEY;
      if (!apiKey) {
        logger.error('Google Places API key is not configured');
        response.status(500).json({ error: 'Server configuration error' });
        return;
      }

      const url = 'https://maps.googleapis.com/maps/api/place/autocomplete/json';
      const params: any = {
        key: apiKey,
        input: input
      };

      if (location && radius) {
        params.location = location;
        params.radius = radius;
      }

      if (types) {
        params.types = types;
      }

      if (components) {
        params.components = components;
      }

      if (sessiontoken) {
        params.sessiontoken = sessiontoken;
      }

      const result = await axios.get(url, { params });

      logger.info('Google Places Autocomplete API request completed successfully');
      response.json(result.data);
    } catch (error) {
      logger.error('Error fetching place autocomplete suggestions:', error);
      response.status(500).json({
        success: false,
        error: error instanceof Error ? error.message : String(error)
      });
    }
  });
});