import EventEmitter from 'events';

import axios from 'axios';
import Gamedig from 'gamedig';

import Logger from 'core/logger';
import { SQUADJS_API_DOMAIN } from 'core/constants';

import LogParser from './log-parser/index.js';
import Rcon from './rcon.js';

import { SQUADJS_VERSION } from './utils/constants.js';
import { SquadLayers } from './utils/squad-layers.js';

import fetchAdminLists from './utils/admin-lists.js';

export default class SquadServer extends EventEmitter {
  constructor(options = {}) {
    super();

    for (const option of ['host', 'queryPort'])
      if (!(option in options)) throw new Error(`${option} must be specified.`);

    this.id = options.id;
    this.options = options;

    this.layerHistory = [];
    this.layerHistoryMaxLength = options.layerHistoryMaxLength || 20;

    this.players = [];

    this.plugins = [];

    this.squadLayers = new SquadLayers(options.squadLayersSource);

    this.setupRCON();
    this.setupLogParser();

    this.updatePlayerList = this.updatePlayerList.bind(this);
    this.updatePlayerListInterval = 30 * 1000;
    this.updatePlayerListTimeout = null;

    this.updateLayerInformation = this.updateLayerInformation.bind(this);
    this.updateLayerInformationInterval = 30 * 1000;
    this.updateLayerInformationTimeout = null;

    this.updateA2SInformation = this.updateA2SInformation.bind(this);
    this.updateA2SInformationInterval = 30 * 1000;
    this.updateA2SInformationTimeout = null;

    this.pingSquadJSAPI = this.pingSquadJSAPI.bind(this);
    this.pingSquadJSAPIInterval = 5 * 60 * 1000;
    this.pingSquadJSAPITimeout = null;
  }

  async watch() {
    Logger.verbose(
      'SquadServer',
      1,
      `Beginning to watch ${this.options.host}:${this.options.queryPort}...`
    );
    await this.squadLayers.pull();
    this.admins = await fetchAdminLists(this.options.adminLists);

    await this.rcon.connect();
    await this.logParser.watch();

    await this.updatePlayerList();
    await this.updateLayerInformation();
    await this.updateA2SInformation();

    Logger.verbose('SquadServer', 1, `Watching ${this.serverName}...`);

    await this.pingSquadJSAPI();
  }

  async unwatch() {
    await this.rcon.disconnect();
    await this.logParser.unwatch();
  }

  setupRCON() {
    this.rcon = new Rcon({
      host: this.options.rconHost || this.options.host,
      port: this.options.rconPort,
      password: this.options.rconPassword,
      autoReconnectInterval: this.options.rconAutoReconnectInterval
    });

    this.rcon.on('CHAT_MESSAGE', async (data) => {
      data.player = await this.getPlayerBySteamID(data.steamID);
      this.emit('CHAT_MESSAGE', data);

      const command = data.message.match(/!([^ ]+) ?(.*)/);
      if (command)
        this.emit(`CHAT_COMMAND:${command[1].toLowerCase()}`, {
          ...data,
          message: command[2].trim()
        });
    });

    this.rcon.on('RCON_ERROR', (data) => {
      this.emit('RCON_ERROR', data);
    });
  }

  async restartRCON() {
    try {
      await this.rcon.disconnect();
    } catch (err) {
      Logger.verbose('SquadServer', 1, 'Failed to stop RCON instance when restarting.', err);
    }

    Logger.verbose('SquadServer', 1, 'Setting up new RCON instance...');
    this.setupRCON();
    await this.rcon.connect();
  }

  setupLogParser() {
    this.logParser = new LogParser(
      Object.assign(this.options.ftp, {
        mode: this.options.logReaderMode,
        logDir: this.options.logDir,
        host: this.options.ftp.host || this.options.host
      })
    );

    this.logParser.on('ADMIN_BROADCAST', (data) => {
      this.emit('ADMIN_BROADCAST', data);
    });

    this.logParser.on('NEW_GAME', (data) => {
      data.layer = this.squadLayers.getLayerByLayerClassname(data.layerClassname);

      this.layerHistory.unshift({ ...data.layer, time: data.time });
      this.layerHistory = this.layerHistory.slice(0, this.layerHistoryMaxLength);

      this.emit('NEW_GAME', data);
    });

    this.logParser.on('PLAYER_CONNECTED', async (data) => {
      data.player = await this.getPlayerBySteamID(data.steamID);
      if (data.player) data.player.suffix = data.playerSuffix;

      delete data.steamID;
      delete data.playerSuffix;

      this.emit('PLAYER_CONNECTED', data);
    });

    this.logParser.on('PLAYER_DAMAGED', async (data) => {
      data.victim = await this.getPlayerByName(data.victimName);
      data.attacker = await this.getPlayerByName(data.attackerName);

      if (data.victim && data.attacker)
        data.teamkill =
          data.victim.teamID === data.attacker.teamID &&
          data.victim.steamID !== data.attacker.steamID;

      delete data.victimName;
      delete data.attackerName;

      this.emit('PLAYER_DAMAGED', data);
    });

    this.logParser.on('PLAYER_WOUNDED', async (data) => {
      data.victim = await this.getPlayerByName(data.victimName);
      data.attacker = await this.getPlayerByName(data.attackerName);

      if (data.victim && data.attacker)
        data.teamkill =
          data.victim.teamID === data.attacker.teamID &&
          data.victim.steamID !== data.attacker.steamID;

      delete data.victimName;
      delete data.attackerName;

      this.emit('PLAYER_WOUNDED', data);
      if (data.teamkill) this.emit('TEAMKILL', data);
    });

    this.logParser.on('PLAYER_DIED', async (data) => {
      data.victim = await this.getPlayerByName(data.victimName);

      if (data.victim && data.attacker)
        data.teamkill =
          data.victim.teamID === data.attacker.teamID &&
          data.victim.steamID !== data.attacker.steamID;

      delete data.victimName;
      delete data.attackerName;

      this.emit('PLAYER_DIED', data);
    });

    this.logParser.on('PLAYER_REVIVED', async (data) => {
      data.victim = await this.getPlayerByName(data.victimName);
      data.attacker = await this.getPlayerByName(data.attackerName);
      data.reviver = await this.getPlayerByName(data.reviverName);

      delete data.victimName;
      delete data.attackerName;
      delete data.reviverName;

      this.emit('PLAYER_REVIVED', data);
    });

    this.logParser.on('PLAYER_POSSESS', async (data) => {
      data.player = await this.getPlayerByNameSuffix(data.playerSuffix);
      if (data.player) data.player.possessClassname = data.possessClassname;

      delete data.playerSuffix;

      this.emit('PLAYER_POSSESS', data);
    });

    this.logParser.on('PLAYER_UNPOSSESS', async (data) => {
      data.player = await this.getPlayerByNameSuffix(data.playerSuffix);

      delete data.playerSuffix;

      this.emit('PLAYER_UNPOSSESS', data);
    });

    this.logParser.on('TICK_RATE', (data) => {
      this.emit('TICK_RATE', data);
    });
  }

  async restartLogParser() {
    try {
      await this.logParser.unwatch();
    } catch (err) {
      Logger.verbose('SquadServer', 1, 'Failed to stop LogParser instance when restarting.', err);
    }

    Logger.verbose('SquadServer', 1, 'Setting up new LogParser instance...');
    this.setupLogParser();
    await this.logParser.watch();
  }

  async getAdminBySteamID(steamID) {
    return this.admins[steamID];
  }

  async getAdminsWithPermission(perm) {
    const ret = [];
    for (const [steamID, perms] of Object.entries(this.admins)) {
      if (perm in perms) ret.push(this.admins[steamID]);
    }
    return ret;
  }

  async updatePlayerList() {
    if (this.updatePlayerListTimeout) clearTimeout(this.updatePlayerListTimeout);

    Logger.verbose('SquadServer', 1, `Updating player list...`);

    try {
      const oldPlayerInfo = {};
      for (const player of this.players) {
        oldPlayerInfo[player.steamID] = player;
      }

      this.players = (await this.rcon.getListPlayers()).map((player) => ({
        ...oldPlayerInfo[player.steamID],
        ...player
      }));

      for (const player of this.players) {
        if (typeof oldPlayerInfo[player.steamID] === 'undefined') continue;
        if (player.teamID !== oldPlayerInfo[player.steamID].teamID)
          this.emit('PLAYER_TEAM_CHANGE', {
            player: player,
            oldTeamID: oldPlayerInfo[player.steamID].teamID,
            newTeamID: player.teamID
          });
        if (player.squadID !== oldPlayerInfo[player.steamID].squadID)
          this.emit('PLAYER_SQUAD_CHANGE', {
            player: player,
            oldSquadID: oldPlayerInfo[player.steamID].squadID,
            newSquadID: player.squadID
          });
      }

      this.emit('UPDATED_PLAYER_INFORMATION');
    } catch (err) {
      Logger.verbose('SquadServer', 1, 'Failed to update player list.', err);
    }

    Logger.verbose('SquadServer', 1, `Updated player list.`);

    this.updatePlayerListTimeout = setTimeout(this.updatePlayerList, this.updatePlayerListInterval);
  }

  async updateLayerInformation() {
    if (this.updateLayerInformationTimeout) clearTimeout(this.updateLayerInformationTimeout);

    Logger.verbose('SquadServer', 1, `Updating layer information...`);

    try {
      const layerInfo = await this.rcon.getLayerInfo();

      if (this.layerHistory.length === 0) {
        const layer = this.squadLayers.getLayerByLayerName(layerInfo.currentLayer);

        this.layerHistory.unshift({ ...layer, time: Date.now() });
        this.layerHistory = this.layerHistory.slice(0, this.layerHistoryMaxLength);
      }

      this.nextLayer = layerInfo.nextLayer;

      this.emit('UPDATED_LAYER_INFORMATION');
    } catch (err) {
      Logger.verbose('SquadServer', 1, 'Failed to update layer information.', err);
    }

    Logger.verbose('SquadServer', 1, `Updated layer information.`);

    this.updateLayerInformationTimeout = setTimeout(
      this.updateLayerInformation,
      this.updateLayerInformationInterval
    );
  }

  async updateA2SInformation() {
    if (this.updateA2SInformationTimeout) clearTimeout(this.updateA2SInformationTimeout);

    Logger.verbose('SquadServer', 1, `Updating A2S information...`);

    try {
      const data = await Gamedig.query({
        type: 'squad',
        host: this.options.host,
        port: this.options.queryPort
      });

      this.serverName = data.name;

      this.maxPlayers = parseInt(data.maxplayers);
      this.publicSlots = parseInt(data.raw.rules.NUMPUBCONN);
      this.reserveSlots = parseInt(data.raw.rules.NUMPRIVCONN);

      this.a2sPlayerCount = parseInt(data.raw.rules.PlayerCount_i);
      this.publicQueue = parseInt(data.raw.rules.PublicQueue_i);
      this.reserveQueue = parseInt(data.raw.rules.ReservedQueue_i);

      this.matchTimeout = parseFloat(data.raw.rules.MatchTimeout_f);
      this.gameVersion = data.raw.version;

      this.emit('UPDATED_A2S_INFORMATION');
    } catch (err) {
      Logger.verbose('SquadServer', 1, 'Failed to update A2S information.', err);
    }

    Logger.verbose('SquadServer', 1, `Updated A2S information.`);

    this.updateA2SInformationTimeout = setTimeout(
      this.updateA2SInformation,
      this.updateA2SInformationInterval
    );
  }

  async getPlayerByCondition(condition, forceUpdate = false, retry = true) {
    let matches;

    if (!forceUpdate) {
      matches = this.players.filter(condition);
      if (matches.length === 1) return matches[0];

      if (!retry) return null;
    }

    await this.updatePlayerList();

    matches = this.players.filter(condition);
    if (matches.length === 1) return matches[0];

    return null;
  }

  async getPlayerBySteamID(steamID, forceUpdate) {
    return this.getPlayerByCondition((player) => player.steamID === steamID, forceUpdate);
  }

  async getPlayerByName(name, forceUpdate) {
    return this.getPlayerByCondition((player) => player.name === name, forceUpdate);
  }

  async getPlayerByNameSuffix(suffix, forceUpdate) {
    return this.getPlayerByCondition((player) => player.suffix === suffix, forceUpdate, false);
  }

  async pingSquadJSAPI() {
    if (this.pingSquadJSAPITimeout) clearTimeout(this.pingSquadJSAPITimeout);

    Logger.verbose('SquadServer', 1, 'Pinging SquadJS API...');

    const payload = {
      // Send information about the server.
      server: {
        host: this.options.host,
        queryPort: this.options.queryPort,

        name: this.serverName,
        playerCount: this.players.length
      },

      // Send information about SquadJS.
      squadjs: {
        version: SQUADJS_VERSION,
        logReaderMode: this.options.logReaderMode,

        // Send the plugin config so we can see what plugins they're using (none of the config is sensitive).
        plugins: this.plugins.map((plugin) => ({
          ...plugin.rawOptions,
          plugin: plugin.constructor.name
        }))
      }
    };

    try {
      const { data } = await axios.post(SQUADJS_API_DOMAIN + '/api/v1/ping', payload);

      if (data.error)
        Logger.verbose(
          'SquadServer',
          1,
          `Successfully pinged the SquadJS API. Got back error: ${data.error}`
        );
      else
        Logger.verbose(
          'SquadServer',
          1,
          `Successfully pinged the SquadJS API. Got back message: ${data.message}`
        );
    } catch (err) {
      Logger.verbose('SquadServer', 1, 'Failed to ping the SquadJS API: ', err);
    }

    this.pingSquadJSAPITimeout = setTimeout(this.pingSquadJSAPI, this.pingSquadJSAPIInterval);
  }
}