import * as fs from 'fs';
import { sep } from 'path';
import request from 'request-promise';
import { Logger, LoggerService } from '../../utils/logger.js';
import { Common, CommonService } from '../../utils/common.js';
let options = null;
const logger: LoggerService = Logger;
const common: CommonService = Common;


function getFilesList(channelBackupPath, callback) {
  const files_list = [];
  let all_restore_exists = false;
  let response = { all_restore_exists: false, files: [] } || { message: '', error: {}, statusCode: 500 };
  fs.readdir(channelBackupPath + sep + 'restore', (err, files) => {
    if (err && err.code !== 'ENOENT' && err.errno !== -4058) {
      response = { message: 'Channels Restore List Failed!', error: err, statusCode: 500 };
    }
    if (files && files.length > 0) {
      files.forEach((file) => {
        if (!file.includes('.restored')) {
          if (file.toLowerCase() === 'channel-all.bak' || file.toLowerCase() === 'backup-channel-all.bak') {
            all_restore_exists = true;
          } else {
            files_list.push({ channel_point: file.substring(8, file.length - 4)?.replace('-', ':') });
          }
        }
      });
    }
    response = { all_restore_exists: all_restore_exists, files: files_list };
    callback(response);
  });
}

export const getBackup = (req, res, next) => {
  logger.log({ selectedNode: req.session.selectedNode, level: 'INFO', fileName: 'ChannelBackup', msg: 'Getting Channel Backup..' });
  options = common.getOptions(req);
  if (options.error) { return res.status(options.statusCode).json({ message: options.message, error: options.error }); }
  let channel_backup_file = '';
  let message = '';
  if (req.params.channelPoint === 'ALL') {
    channel_backup_file = req.session.selectedNode.channel_backup_path + sep + 'channel-all.bak';
    message = 'All Channels Backup Successful.';
    options.url = req.session.selectedNode.ln_server_url + '/v1/channels/backup';
  } else {
    channel_backup_file = req.session.selectedNode.channel_backup_path + sep + 'channel-' + req.params.channelPoint?.replace(':', '-') + '.bak';
    message = 'Channel Backup Successful.';
    const channelpoint = req.params.channelPoint?.replace(':', '/');
    options.url = req.session.selectedNode.ln_server_url + '/v1/channels/backup/' + channelpoint;
    const exists = fs.existsSync(channel_backup_file);
    if (exists) {
      fs.writeFile(channel_backup_file, '', () => { });
    } else {
      try {
        const createStream = fs.createWriteStream(channel_backup_file);
        createStream.end();
      } catch (errRes) {
        const err = common.handleError(errRes, 'ChannelsBackup', 'Backup Channels Error', req.session.selectedNode);
        return res.status(err.statusCode).json({ message: err.message, error: err.error });
      }
    }
  }
  request(options).then((body) => {
    logger.log({ selectedNode: req.session.selectedNode, level: 'DEBUG', fileName: 'ChannelsBackup', msg: 'Channel Backup Received', data: body });
    fs.writeFile(channel_backup_file, JSON.stringify(body), (errRes) => {
      if (errRes) {
        const err = common.handleError(errRes, 'ChannelsBackup', 'Backup Channels Error', req.session.selectedNode);
        return res.status(err.statusCode).json({ message: err.message, error: err.error });
      } else {
        logger.log({ selectedNode: req.session.selectedNode, level: 'INFO', fileName: 'ChannelBackup', msg: 'Channel Backed up and Saved', data: body });
        res.status(200).json({ message: message });
      }
    });
  }).catch((errRes) => {
    const err = common.handleError(errRes, 'ChannelsBackup', 'Backup Channels Error', req.session.selectedNode);
    return res.status(err.statusCode).json({ message: err.message, error: err.error });
  });
};

export const postBackupVerify = (req, res, next) => {
  logger.log({ selectedNode: req.session.selectedNode, level: 'INFO', fileName: 'ChannelBackup', msg: 'Verifying Channel Backup..' });
  options = common.getOptions(req);
  if (options.error) { return res.status(options.statusCode).json({ message: options.message, error: options.error }); }
  options.url = req.session.selectedNode.ln_server_url + '/v1/channels/backup/verify';
  let channel_verify_file = '';
  let message = '';
  let verify_backup = '';
  if (req.params.channelPoint === 'ALL') {
    message = 'All Channels Verify Successful.';
    channel_verify_file = req.session.selectedNode.channel_backup_path + sep + 'channel-all.bak';
    const exists = fs.existsSync(channel_verify_file);
    if (exists) {
      verify_backup = fs.readFileSync(channel_verify_file, 'utf-8');
      if (verify_backup !== '') {
        const verify_backup_json = JSON.parse(verify_backup);
        delete verify_backup_json.single_chan_backups;
        options.form = JSON.stringify(verify_backup_json);
      } else {
        const errMsg = 'Channel backup to verify does not Exist.';
        const err = common.handleError({ statusCode: 404, message: 'Verify Channel Error', error: errMsg }, 'ChannelBackup', errMsg, req.session.selectedNode);
        return res.status(err.statusCode).json({ message: err.message, error: err.error });
      }
    } else {
      verify_backup = '';
      const errMsg = 'Channel backup to verify does not Exist.';
      const err = common.handleError({ statusCode: 404, message: 'Verify Channel Error', error: errMsg }, 'ChannelBackup', errMsg, req.session.selectedNode);
      return res.status(err.statusCode).json({ message: err.message, error: err.error });
    }
  } else {
    message = 'Channel Verify Successful.';
    channel_verify_file = req.session.selectedNode.channel_backup_path + sep + 'channel-' + req.params.channelPoint?.replace(':', '-') + '.bak';
    const exists = fs.existsSync(channel_verify_file);
    if (exists) {
      verify_backup = fs.readFileSync(channel_verify_file, 'utf-8');
      options.form = JSON.stringify({ single_chan_backups: { chan_backups: [JSON.parse(verify_backup)] } });
    } else {
      verify_backup = '';
      const errMsg = 'Channel backup to verify does not Exist.';
      const err = common.handleError({ statusCode: 404, message: 'Verify Channel Error', error: errMsg }, 'ChannelBackup', errMsg, req.session.selectedNode);
      return res.status(err.statusCode).json({ message: err.message, error: err.error });
    }
  }
  if (verify_backup !== '') {
    request.post(options).then((body) => {
      logger.log({ selectedNode: req.session.selectedNode, level: 'INFO', fileName: 'ChannelBackup', msg: 'Channel Backup Verified', data: body });
      res.status(201).json({ message: message });
    }).
      catch((errRes) => {
        const err = common.handleError(errRes, 'ChannelsBackup', 'Verify Channels Error', req.session.selectedNode);
        return res.status(err.statusCode).json({ message: err.message, error: err.error });
      });
  }
};

export const postRestore = (req, res, next) => {
  logger.log({ selectedNode: req.session.selectedNode, level: 'INFO', fileName: 'ChannelBackup', msg: 'Restoring Channel Backup..' });
  options = common.getOptions(req);
  if (options.error) { return res.status(options.statusCode).json({ message: options.message, error: options.error }); }
  options.url = req.session.selectedNode.ln_server_url + '/v1/channels/backup/restore';
  let channel_restore_file = '';
  let message = '';
  let restore_backup = '';
  if (req.params.channelPoint === 'ALL') {
    message = 'All Channels Restore Successful.';
    channel_restore_file = req.session.selectedNode.channel_backup_path + sep + 'restore' + sep;
    const exists = fs.existsSync(channel_restore_file + 'channel-all.bak');
    const downloaded_exists = fs.existsSync(channel_restore_file + 'backup-channel-all.bak');
    if (exists) {
      restore_backup = fs.readFileSync(channel_restore_file + 'channel-all.bak', 'utf-8');
      if (restore_backup !== '') {
        const restore_backup_json = JSON.parse(restore_backup);
        options.form = JSON.stringify({ multi_chan_backup: restore_backup_json.multi_chan_backup.multi_chan_backup });
      } else {
        const errMsg = 'Channel backup to restore does not Exist.';
        const err = common.handleError({ statusCode: 404, message: 'Restore Channel Error', error: errMsg }, 'ChannelBackup', errMsg, req.session.selectedNode);
        return res.status(err.statusCode).json({ message: err.message, error: err.error });
      }
    } else if (downloaded_exists) {
      restore_backup = fs.readFileSync(channel_restore_file + 'backup-channel-all.bak', 'utf-8');
      if (restore_backup !== '') {
        const restore_backup_json = JSON.parse(restore_backup);
        options.form = JSON.stringify({ multi_chan_backup: restore_backup_json.multi_chan_backup.multi_chan_backup });
      } else {
        const errMsg = 'Channel backup to restore does not Exist.';
        const err = common.handleError({ statusCode: 404, message: 'Restore Channel Error', error: errMsg }, 'ChannelBackup', errMsg, req.session.selectedNode);
        return res.status(err.statusCode).json({ message: err.message, error: err.error });
      }
    } else {
      restore_backup = '';
      const errMsg = 'Channel backup to restore does not Exist.';
      const err = common.handleError({ statusCode: 404, message: 'Restore Channel Error', error: errMsg }, 'ChannelBackup', errMsg, req.session.selectedNode);
      return res.status(err.statusCode).json({ message: err.message, error: err.error });
    }
  } else {
    message = 'Channel Restore Successful.';
    channel_restore_file = req.session.selectedNode.channel_backup_path + sep + 'restore' + sep + 'channel-' + req.params.channelPoint?.replace(':', '-') + '.bak';
    const exists = fs.existsSync(channel_restore_file);
    if (exists) {
      restore_backup = fs.readFileSync(channel_restore_file, 'utf-8');
      options.form = JSON.stringify({ chan_backups: { chan_backups: [JSON.parse(restore_backup)] } });
    } else {
      restore_backup = '';
      const errMsg = 'Channel backup to restore does not Exist.';
      const err = common.handleError({ statusCode: 404, message: 'Restore Channel Error', error: errMsg }, 'ChannelBackup', errMsg, req.session.selectedNode);
      return res.status(err.statusCode).json({ message: err.message, error: err.error });
    }
  }
  if (restore_backup !== '') {
    request.post(options).then((body) => {
      logger.log({ selectedNode: req.session.selectedNode, level: 'DEBUG', fileName: 'ChannelBackup', msg: 'Channel Restored', data: body });
      if (req.params.channelPoint === 'ALL') { channel_restore_file = channel_restore_file + 'channel-all.bak'; }
      fs.rename(channel_restore_file, channel_restore_file + '.restored', () => {
        getFilesList(req.session.selectedNode.channel_backup_path, (getFilesListRes) => {
          if (getFilesListRes.error) {
            const errMsg = getFilesListRes.error;
            const err = common.handleError({ statusCode: 500, message: 'Restore Channel Error', error: errMsg }, 'ChannelBackup', errMsg, req.session.selectedNode);
            return res.status(err.statusCode).json({ message: err.error, list: getFilesListRes });
          } else {
            logger.log({ selectedNode: req.session.selectedNode, level: 'INFO', fileName: 'ChannelBackup', msg: 'Channel Restored and Saved' });
            return res.status(201).json({ message: message, list: getFilesListRes });
          }
        });
      });
    }).
      catch((errRes) => {
        const err = common.handleError(errRes, 'ChannelsBackup', 'Restore Channel Error', req.session.selectedNode);
        return res.status(err.statusCode).json({ message: err.message, error: err.error });
      });
  }
};

export const getRestoreList = (req, res, next) => {
  getFilesList(req.session.selectedNode.channel_backup_path, (getFilesListRes) => {
    if (getFilesListRes.error) {
      return res.status(getFilesListRes.statusCode).json(getFilesListRes);
    } else {
      return res.status(200).json(getFilesListRes);
    }
  });
};