import * as os from 'os';
import * as fs from 'fs';
import { join, dirname, sep } from 'path';
import { fileURLToPath } from 'url';
import * as crypto from 'crypto';
import ini from 'ini';
import parseHocon from 'hocon-parser';
import { Common, CommonService } from './common.js';
import { Logger, LoggerService } from './logger.js';

export class ConfigService {

  private platform = os.platform();
  private hash = crypto.createHash('sha256');
  private errMsg = '';
  private directoryName = dirname(fileURLToPath(import.meta.url));
  private common: CommonService = Common;
  private logger: LoggerService = Logger;

  constructor() {
    this.setServerConfiguration();
  }

  private setDefaultConfig = () => {
    const homeDir = os.userInfo().homedir;
    let macaroonPath = '';
    let configPath = '';
    let channelBackupPath = '';
    let dbPath = '';
    switch (this.platform) {
      case 'win32':
        macaroonPath = homeDir + '\\AppData\\Local\\Lnd\\data\\chain\\bitcoin\\mainnet';
        configPath = homeDir + '\\AppData\\Local\\Lnd\\lnd.conf';
        channelBackupPath = homeDir + '\\backup\\node-1';
        dbPath = homeDir + '\\database\\node-1';
        break;
      case 'darwin':
        macaroonPath = homeDir + '/Library/Application Support/Lnd/data/chain/bitcoin/mainnet';
        configPath = homeDir + '/Library/Application Support/Lnd/lnd.conf';
        channelBackupPath = homeDir + '/backup/node-1';
        dbPath = homeDir + '/database/node-1';
        break;
      case 'linux':
        macaroonPath = homeDir + '/.lnd/data/chain/bitcoin/mainnet';
        configPath = homeDir + '/.lnd/lnd.conf';
        channelBackupPath = homeDir + '/backup/node-1';
        dbPath = homeDir + '/database/node-1';
        break;
      default:
        macaroonPath = '';
        configPath = '';
        channelBackupPath = '';
        dbPath = '';
        break;
    }
    const configData = {
      port: '3000',
      defaultNodeIndex: 1,
      dbDirectoryPath: dbPath,
      SSO: {
        rtlSSO: 0,
        rtlCookiePath: '',
        logoutRedirectLink: ''
      },
      nodes: [
        {
          index: 1,
          lnNode: 'Node 1',
          lnImplementation: 'LND',
          authentication: {
            macaroonPath: macaroonPath,
            configPath: configPath
          },
          settings: {
            userPersona: 'MERCHANT',
            themeMode: 'DAY',
            themeColor: 'PURPLE',
            channelBackupPath: channelBackupPath,
            logLevel: 'ERROR',
            lnServerUrl: 'https://127.0.0.1:8080',
            fiatConversion: false,
            unannouncedChannels: false,
            blockExplorerUrl: 'https://mempool.space'
          }
        }
      ]
    };
    if ((process?.env?.RTL_SSO && +process?.env?.RTL_SSO === 0) || configData.SSO.rtlSSO === 0) {
      configData['multiPass'] = 'password';
    }
    return configData;
  };

  private normalizePort = (val) => {
    const port = parseInt(val, 10);
    if (isNaN(port)) {
      return val;
    }
    if (port >= 0) {
      return port;
    }
    return false;
  };

  private updateLogByLevel = () => {
    let updateLogFlag = false;
    this.common.appConfig.rtlConfFilePath = process?.env?.RTL_CONFIG_PATH ? process?.env?.RTL_CONFIG_PATH : join(this.directoryName, '../..');
    try {
      const RTLConfFile = this.common.appConfig.rtlConfFilePath + sep + 'RTL-Config.json';
      const config = JSON.parse(fs.readFileSync(RTLConfFile, 'utf-8'));
      config.nodes.forEach((node) => {
        if (node.settings.hasOwnProperty('enableLogging')) {
          updateLogFlag = true;
          node.settings.logLevel = node.settings.enableLogging ? 'INFO' : 'ERROR';
          delete node.settings.enableLogging;
        }
      });
      if (updateLogFlag) {
        fs.writeFileSync(RTLConfFile, JSON.stringify(config, null, 2), 'utf-8');
      }
    } catch (err) {
      this.errMsg = this.errMsg + '\nLog level update failed!';
    }
  };

  private validateNodeConfig = (config) => {
    config.allowPasswordUpdate = true;
    if ((process?.env?.RTL_SSO && +process?.env?.RTL_SSO === 0) || (typeof process?.env?.RTL_SSO === 'undefined' && +config.SSO.rtlSSO === 0)) {
      if (process?.env?.APP_PASSWORD && process?.env?.APP_PASSWORD.trim() !== '') {
        config.rtlPass = this.hash.update(process?.env?.APP_PASSWORD).digest('hex');
        config.allowPasswordUpdate = false;
      } else if (config.multiPassHashed && config.multiPassHashed !== '') {
        config.rtlPass = config.multiPassHashed;
      } else if (config.multiPass && config.multiPass !== '') {
        config.rtlPass = this.common.replacePasswordWithHash(this.hash.update(config.multiPass).digest('hex'));
      } else {
        this.errMsg = this.errMsg + '\nNode Authentication can be set with multiPass only. Please set multiPass in RTL-Config.json';
      }
      config.enable2FA = !!config.secret2FA;
    } else {
      if (process?.env?.APP_PASSWORD && process?.env?.APP_PASSWORD.trim() !== '') {
        this.errMsg = this.errMsg + '\nRTL Password cannot be set with SSO. Please set SSO as 0 or remove password.';
      }
    }
    this.common.port = (process?.env?.PORT) ? this.normalizePort(process?.env?.PORT) : (config.port) ? this.normalizePort(config.port) : 3000;
    this.common.host = (process?.env?.HOST) ? process?.env?.HOST : (config.host) ? config.host : null;
    config.dbDirectoryPath = (process?.env?.DB_DIRECTORY_PATH) ? process?.env?.DB_DIRECTORY_PATH : (config.dbDirectoryPath) ? config.dbDirectoryPath : join(dirname(fileURLToPath(import.meta.url)), '..', '..');
    if (config.nodes && config.nodes.length > 0) {
      config.nodes.forEach((node, idx) => {
        this.common.nodes[idx] = { settings: { blockExplorerUrl: '' }, authentication: {} };
        this.common.nodes[idx].index = node.index;
        this.common.nodes[idx].lnNode = node.lnNode;
        this.common.nodes[idx].lnImplementation = (process?.env?.LN_IMPLEMENTATION) ? process?.env?.LN_IMPLEMENTATION : node.lnImplementation ? node.lnImplementation : 'LND';
        if (this.common.nodes[idx].lnImplementation === 'CLT') { this.common.nodes[idx].lnImplementation = 'CLN'; }
        switch (this.common.nodes[idx].lnImplementation) {
          case 'CLN':
            if (process?.env?.RUNE_PATH && process?.env?.RUNE_PATH.trim() !== '') {
              this.common.nodes[idx].authentication.runePath = process?.env?.RUNE_PATH;
            } else if (node.authentication && node.authentication.runePath && node.authentication.runePath.trim() !== '') {
              this.common.nodes[idx].authentication.runePath = node.authentication.runePath;
            } else {
              this.errMsg = 'Please set rune path for node index ' + node.index + ' in RTL-Config.json!';
            }
            break;

          case 'ECL':
            if (process?.env?.LN_API_PASSWORD) {
              this.common.nodes[idx].authentication.lnApiPassword = process?.env?.LN_API_PASSWORD;
            } else if (node.authentication && node.authentication.lnApiPassword) {
              this.common.nodes[idx].authentication.lnApiPassword = node.authentication.lnApiPassword;
            } else {
              this.common.nodes[idx].authentication.lnApiPassword = '';
            }
            break;

          default:
            if (process?.env?.MACAROON_PATH && process?.env?.MACAROON_PATH.trim() !== '') {
              this.common.nodes[idx].authentication.macaroonPath = process?.env?.MACAROON_PATH;
            } else if (node.authentication && node.authentication.macaroonPath && node.authentication.macaroonPath.trim() !== '') {
              this.common.nodes[idx].authentication.macaroonPath = node.authentication.macaroonPath;
            } else {
              this.errMsg = 'Please set macaroon path for node index ' + node.index + ' in RTL-Config.json!';
            }
            break;
        }
        if (process?.env?.CONFIG_PATH) {
          this.common.nodes[idx].authentication.configPath = process?.env?.CONFIG_PATH;
        } else if (node.authentication && node.authentication.configPath) {
          this.common.nodes[idx].authentication.configPath = node.authentication.configPath;
        } else {
          this.common.nodes[idx].authentication.configPath = '';
        }
        if (this.common.nodes[idx].lnImplementation === 'ECL' && this.common.nodes[idx].authentication.lnApiPassword === '' && this.common.nodes[idx].authentication.configPath !== '') {
          try {
            const exists = fs.existsSync(this.common.nodes[idx].authentication.configPath || '');
            if (exists) {
              try {
                const configFile = fs.readFileSync((this.common.nodes[idx].authentication.configPath || ''), 'utf-8');
                const iniParsed = ini.parse(configFile);
                this.common.nodes[idx].authentication.lnApiPassword = iniParsed['eclair.api.password'] ? iniParsed['eclair.api.password'] : parseHocon(configFile).eclair.api.password;
              } catch (err) {
                this.errMsg = this.errMsg + '\nSomething went wrong while reading config file: \n' + err;
              }
            } else {
              this.errMsg = this.errMsg + '\nInvalid config path: ' + this.common.nodes[idx].authentication.configPath;
            }
          } catch (err) {
            this.errMsg = this.errMsg + '\nUnable to read config file: \n' + err;
          }
        }
        if (this.common.nodes[idx].lnImplementation === 'ECL' && this.common.nodes[idx].authentication.lnApiPassword === '') {
          this.errMsg = this.errMsg + '\nPlease set config path Or api password for node index ' + node.index + ' in RTL-Config.json! It is mandatory for Eclair authentication!';
        }

        if (process?.env?.LN_SERVER_URL && process?.env?.LN_SERVER_URL.trim() !== '') {
          this.common.nodes[idx].settings.lnServerUrl = process?.env?.LN_SERVER_URL.endsWith('/v1') ? process?.env?.LN_SERVER_URL.slice(0, -3) : process?.env?.LN_SERVER_URL;
        } else if (process?.env?.LND_SERVER_URL && process?.env?.LND_SERVER_URL.trim() !== '') {
          this.common.nodes[idx].settings.lnServerUrl = process?.env?.LND_SERVER_URL.endsWith('/v1') ? process?.env?.LND_SERVER_URL.slice(0, -3) : process?.env?.LND_SERVER_URL;
        } else if (node.settings.lnServerUrl && node.settings.lnServerUrl.trim() !== '') {
          this.common.nodes[idx].settings.lnServerUrl = node.settings.lnServerUrl.endsWith('/v1') ? node.settings.lnServerUrl.slice(0, -3) : node.settings.lnServerUrl;
        } else if (node.settings.lndServerUrl && node.settings.lndServerUrl.trim() !== '') {
          this.common.nodes[idx].settings.lnServerUrl = node.settings.lndServerUrl.endsWith('/v1') ? node.settings.lndServerUrl.slice(0, -3) : node.settings.lndServerUrl;
        } else {
          this.errMsg = this.errMsg + '\nPlease set LN Server URL for node index ' + node.index + ' in RTL-Config.json!';
        }
        this.common.nodes[idx].settings.userPersona = node.settings.userPersona ? node.settings.userPersona : 'MERCHANT';
        this.common.nodes[idx].settings.themeMode = node.settings.themeMode ? node.settings.themeMode : 'DAY';
        this.common.nodes[idx].settings.themeColor = node.settings.themeColor ? node.settings.themeColor : 'PURPLE';
        this.common.nodes[idx].settings.unannouncedChannels = node.settings.unannouncedChannels ? !!node.settings.unannouncedChannels : false;
        this.common.nodes[idx].settings.logLevel = node.settings.logLevel ? node.settings.logLevel : 'ERROR';
        this.common.nodes[idx].settings.fiatConversion = node.settings.fiatConversion ? !!node.settings.fiatConversion : false;
        if (this.common.nodes[idx].settings.fiatConversion) {
          this.common.nodes[idx].settings.currencyUnit = node.settings.currencyUnit ? node.settings.currencyUnit : 'USD';
        }
        if (process?.env?.SWAP_SERVER_URL && process?.env?.SWAP_SERVER_URL.trim() !== '') {
          this.common.nodes[idx].settings.swapServerUrl = process?.env?.SWAP_SERVER_URL.endsWith('/v1') ? process?.env?.SWAP_SERVER_URL.slice(0, -3) : process?.env?.SWAP_SERVER_URL;
          this.common.nodes[idx].authentication.swapMacaroonPath = process?.env?.SWAP_MACAROON_PATH;
        } else if (node.settings.swapServerUrl && node.settings.swapServerUrl.trim() !== '') {
          this.common.nodes[idx].settings.swapServerUrl = node.settings.swapServerUrl.endsWith('/v1') ? node.settings.swapServerUrl.slice(0, -3) : node.settings.swapServerUrl;
          this.common.nodes[idx].authentication.swapMacaroonPath = node.authentication.swapMacaroonPath ? node.authentication.swapMacaroonPath : '';
        } else {
          this.common.nodes[idx].settings.swapServerUrl = '';
          this.common.nodes[idx].authentication.swapMacaroonPath = '';
        }
        if (process?.env?.BOLTZ_SERVER_URL && process?.env?.BOLTZ_SERVER_URL.trim() !== '') {
          this.common.nodes[idx].settings.boltzServerUrl = process?.env?.BOLTZ_SERVER_URL.endsWith('/v1') ? process?.env?.BOLTZ_SERVER_URL.slice(0, -3) : process?.env?.BOLTZ_SERVER_URL;
          this.common.nodes[idx].authentication.boltzMacaroonPath = process?.env?.BOLTZ_MACAROON_PATH;
        } else if (node.settings.boltzServerUrl && node.settings.boltzServerUrl.trim() !== '') {
          this.common.nodes[idx].settings.boltzServerUrl = node.settings.boltzServerUrl.endsWith('/v1') ? node.settings.boltzServerUrl.slice(0, -3) : node.settings.boltzServerUrl;
          this.common.nodes[idx].authentication.boltzMacaroonPath = node.authentication.boltzMacaroonPath ? node.authentication.boltzMacaroonPath : '';
        } else {
          this.common.nodes[idx].settings.boltzServerUrl = '';
          this.common.nodes[idx].authentication.boltzMacaroonPath = '';
        }
        this.common.nodes[idx].settings.enableOffers = process?.env?.ENABLE_OFFERS ? process?.env?.ENABLE_OFFERS : (node.settings.enableOffers) ? node.settings.enableOffers : false;
        this.common.nodes[idx].settings.enablePeerswap = process?.env?.ENABLE_PEERSWAP ? process?.env?.ENABLE_PEERSWAP : (node.settings.enablePeerswap) ? node.settings.enablePeerswap : false;
        this.common.nodes[idx].settings.bitcoindConfigPath = process?.env?.BITCOIND_CONFIG_PATH ? process?.env?.BITCOIND_CONFIG_PATH : (node.settings.bitcoindConfigPath) ? node.settings.bitcoindConfigPath : '';
        this.common.nodes[idx].settings.channelBackupPath = process?.env?.CHANNEL_BACKUP_PATH ? process?.env?.CHANNEL_BACKUP_PATH : (node.settings.channelBackupPath) ? node.settings.channelBackupPath : this.common.appConfig.rtlConfFilePath + sep + 'channels-backup' + sep + 'node-' + node.index;
        this.common.nodes[idx].settings.blockExplorerUrl = process?.env?.BLOCK_EXPLORER_URL ? process.env.BLOCK_EXPLORER_URL : (node.settings.blockExplorerUrl) ? node.settings.blockExplorerUrl : 'https://mempool.space';
        try {
          this.common.createDirectory(this.common.nodes[idx].settings.channelBackupPath);
          const exists = fs.existsSync(this.common.nodes[idx].settings.channelBackupPath + sep + 'channel-all.bak');
          if (!exists) {
            try {
              if (this.common.nodes[idx].lnImplementation === 'LND') {
                this.common.getAllNodeAllChannelBackup(this.common.nodes[idx]);
              } else {
                const createStream = fs.createWriteStream(this.common.nodes[idx].settings.channelBackupPath + sep + 'channel-all.bak');
                createStream.end();
              }
            } catch (err) {
              this.logger.log({ selectedNode: this.common.selectedNode, level: 'ERROR', fileName: 'Config', msg: 'Something went wrong while creating backup file: \n' + err });
            }
          }
        } catch (err) {
          this.logger.log({ selectedNode: this.common.selectedNode, level: 'ERROR', fileName: 'Config', msg: 'Something went wrong while creating the backup directory: \n' + err });
        }
        this.common.nodes[idx].settings.logFile = config.rtlConfFilePath + '/logs/RTL-Node-' + node.index + '.log';
        this.logger.log({ selectedNode: this.common.selectedNode, level: 'INFO', fileName: 'Config', msg: 'Node Config: ' + JSON.stringify(this.common.nodes[idx]) });
        const log_file = this.common.nodes[idx].settings.logFile;
        if (fs.existsSync(log_file || '')) {
          fs.writeFile((log_file || ''), '', () => { });
        } else {
          try {
            const directoryName = dirname(log_file || '');
            this.common.createDirectory(directoryName);
            const createStream = fs.createWriteStream(log_file || '');
            createStream.end();
          } catch (err) {
            this.logger.log({ selectedNode: this.common.selectedNode, level: 'ERROR', fileName: 'Config', msg: 'Something went wrong while creating log file ' + log_file + ': \n' + err });
          }
        }
      });
    }
    this.setSSOParams(config);
    if (this.errMsg && this.errMsg.trim() !== '') { throw new Error(this.errMsg); }
  };

  private setSSOParams = (config) => {
    if (process?.env?.RTL_SSO) {
      config.SSO.rtlSSO = +process?.env?.RTL_SSO;
    } else if (config.SSO && config.SSO.rtlSSO) {
      config.SSO.rtlSSO = config.SSO.rtlSSO;
    }

    if (process?.env?.RTL_COOKIE_PATH) {
      config.SSO.rtlCookiePath = process?.env?.RTL_COOKIE_PATH;
    } else if (config.SSO && config.SSO.rtlCookiePath) {
      config.SSO.rtlCookiePath = config.SSO.rtlCookiePath;
    } else {
      config.SSO.rtlCookiePath = '';
    }

    if (process?.env?.LOGOUT_REDIRECT_LINK) {
      config.SSO.logoutRedirectLink = process?.env?.LOGOUT_REDIRECT_LINK;
    } else if (config.SSO && config.SSO.logoutRedirectLink) {
      config.SSO.logoutRedirectLink = config.SSO.logoutRedirectLink;
    }

    if (+config.SSO.rtlSSO) {
      if (!config.SSO.rtlCookiePath || config.SSO.rtlCookiePath.trim() === '') {
        this.errMsg = 'Please set rtlCookiePath value for single sign on option!';
      } else {
        this.common.readCookie(config);
      }
    }
  };

  private setSelectedNode = (config) => {
    if (config.defaultNodeIndex) {
      this.common.selectedNode = this.common.findNode(config.defaultNodeIndex) || {};
    } else {
      this.common.selectedNode = this.common.findNode(this.common.nodes[0].index) || {};
    }
  };

  private updateConfig = (confFileFullPath, config) => {
    // Update Config file to change Settings to settings and Authentication to authentication
    // Added in v0.15.1, remove in a year?
    if (!config.nodes) { return; }
    config.nodes.map((node) => {
      if (node.Authentication) {
        node.authentication = JSON.parse(JSON.stringify(node.Authentication));
        delete node.Authentication;
      }
      if (node.Settings) {
        node.settings = JSON.parse(JSON.stringify(node.Settings));
        delete node.Settings;
      }
      return node;
    });
    fs.writeFileSync(confFileFullPath, JSON.stringify(config, null, 2), 'utf-8');
  };

  public setServerConfiguration = () => {
    const rtlConfFilePath = (process?.env?.RTL_CONFIG_PATH) ? process?.env?.RTL_CONFIG_PATH : join(this.directoryName, '../..');
    const confFileFullPath = rtlConfFilePath + sep + 'RTL-Config.json';
    try {
      if (!fs.existsSync(confFileFullPath)) {
        fs.writeFileSync(confFileFullPath, JSON.stringify(this.setDefaultConfig(), null, 2), 'utf-8');
      }
      const config = JSON.parse(fs.readFileSync(confFileFullPath, 'utf-8'));
      this.updateConfig(confFileFullPath, config);
      config.rtlConfFilePath = rtlConfFilePath;
      this.updateLogByLevel();
      this.validateNodeConfig(config);
      this.setSelectedNode(config);
      this.common.appConfig = config;
    } catch (err: any) {
      this.logger.log({ selectedNode: this.common.selectedNode, level: 'ERROR', fileName: 'Config', msg: 'Config file path: ' + confFileFullPath });
      this.logger.log({ selectedNode: this.common.selectedNode, level: 'ERROR', fileName: 'Config', msg: 'Something went wrong while configuring the node server: \n' + err });
      throw new Error(err);
    }
  };

}

export const Config = new ConfigService();
