import {
  Plugin,
  Configurable,
  EventListener,
  DependencyLoad
} from '@squeebot/core/lib/plugin';

import { IMessage, MessageResolver } from '@squeebot/core/lib/types';

import { query, QueryResult } from 'gamedig';

interface IMinecraftType {
  vanilla: {
    raw: {
      description: any,
      players: {
        max: number,
        online: number;
      },
      version: {
        name: string;
      }
    }
  };
}

interface ICommonResponse {
  name: string;
  connect: string;
  description: string;
  players: string[];
  maxPlayers: number;
  version: string;
}

/**
 * Find a string from a random mash of objects..
 * @param obj Object
 * @returns found string or undefined
 */
function traverseFindString(obj: any): string | undefined {
  if (typeof obj === 'string') {
    return obj;
  }

  if (Array.isArray(obj)) {
    obj = obj.map((v) => traverseFindString(v));
    for (const p of obj) {
      if (typeof p === 'string') {
        return p;
      }
    }
    return;
  }

  for (const k of Object.keys(obj)) {
    const find = traverseFindString(obj[k]);
    if (find) {
      return find;
    }
  }

  return;
}

class Parsers {
  public static parseMinecraftStatus(response: QueryResult): ICommonResponse | null {
    const result: ICommonResponse = {
      name: 'Minecraft',
      connect: response.connect,
      description: '',
      players: [],
      maxPlayers: 0,
      version: ''
    };

    result.players = response.players.map((player) => player.name) as string[];
    const raw = response.raw as IMinecraftType;
    if (!raw) {
      return null;
    }

    const desc = traverseFindString(raw.vanilla.raw.description) || '';
    result.description = desc.replace(/§./g, '').replace(/\n/g, ' ');

    result.maxPlayers = response.maxplayers;
    result.version = raw.vanilla.raw.version.name;

    return result;
  }
}

@Configurable({
  games: []
})
class GamePlugin extends Plugin {
  @EventListener('pluginUnload')
  public unloadEventHandler(plugin: string | Plugin): void {
    if (plugin === this.name || plugin === this) {
      this.emit('pluginUnloaded', this);
    }
  }

  @DependencyLoad('simplecommands')
  addCommands(cmd: any): void {
    for (const i in this.config.get('games', [])) {
      const game = this.config.get('games', [])[i];
      if (game.game === 'minecraft' && game.host) {
        const port = game.port || 25565;
        const command: any = {
          plugin: this.name,
          name: 'minecraft',
          execute: async (msg: IMessage, msr: MessageResolver, spec: any, prefix: string, ...simplified: any[]): Promise<boolean> => {
            const keys: any[] = [];
            let inclPlayers = false;
            if (simplified[0] === 'players' || simplified[0] === 'online') {
              inclPlayers = true;
            }

            keys.push(['field', 'Minecraft', { type: 'title' }]);

            let state;
            let parsed;
            try {
              state = await query({
                type: 'minecraftping',
                host: game.host,
                port,
              });

              parsed = Parsers.parseMinecraftStatus(state);

              if (!state || !parsed) {
                throw new Error();
              }
            } catch (e) {
              console.log(e)
              msg.resolve([['field', 'Server is offline.', { type: 'title' }]]);
              return true;
            }

            if (inclPlayers) {
              keys.push(['field', parsed.players.length ?
                parsed.players.join(', ') : 'No players', { label: 'Players online' }]);
              msg.resolve(keys);
              return true;
            }

            keys.push(['field', parsed.connect, { label: 'Address' }]);
            keys.push(['field', parsed.description, { label: 'MOTD', type: 'description' }]);
            keys.push(['field', parsed.players.length + '/' + parsed.maxPlayers, { label: 'Players' }]);
            keys.push(['field', parsed.version, { label: 'Version' }]);

            msg.resolve(keys);
            return true;
          },
          description: 'Minecraft server',
          usage: '[players]',
          aliases: ['mc']
        };

        if (game.rooms) {
          command.source = game.rooms;
        }
        cmd.registerCommand(command);
      }
    }
  }
}

module.exports = GamePlugin;