/* eslint-disable no-bitwise */
import nodemailer from 'nodemailer';
import signale from 'signale';
import { Member, Message, Guild, PrivateChannel, GroupChannel, Role, AnyGuildChannel, WebhookPayload } from 'eris';
import { Client, Command, Moderation, RichEmbed } from '.';
import { statusMessages as emotes } from '../configs/emotes.json';

export default class Util {
  public client: Client;

  public moderation: Moderation;

  public signale: signale.Signale;

  public transporter: nodemailer.Transporter;

  constructor(client: Client) {
    this.client = client;
    this.moderation = new Moderation(this.client);
    this.signale = signale;
    this.signale.config({
      displayDate: true,
      displayTimestamp: true,
      displayFilename: true,
    });
    this.transporter = nodemailer.createTransport({
      host: 'staff.libraryofcode.org',
      port: 587,
      auth: { user: 'internal', pass: this.client.config.emailPass },
    });
  }

  get emojis() {
    return {
      SUCCESS: emotes.success,
      LOADING: emotes.loading,
      ERROR: emotes.error,
    };
  }

  /**
   * Resolves a command
   * @param query Command input
   * @param message Only used to check for errors
   */
  public resolveCommand(query: string | string[]): Promise<{cmd: Command, args: string[] }> {
    try {
      if (typeof query === 'string') query = query.split(' ');
      const commands = this.client.commands.toArray();
      const resolvedCommand = commands.find((c) => c.name === query[0].toLowerCase() || c.aliases.includes(query[0].toLowerCase()));

      if (!resolvedCommand) return Promise.resolve(null);
      query.shift();
      return Promise.resolve({ cmd: resolvedCommand, args: query });
    } catch (error) {
      return Promise.reject(error);
    }
  }

  public resolveGuildChannel(query: string, { channels }: Guild, categories = false): AnyGuildChannel | undefined {
    const ch: AnyGuildChannel[] = channels.filter((c) => (!categories ? c.type !== 4 : true));
    return ch.find((c) => c.id === query.replace(/[<#>]/g, '') || c.name === query)
      || ch.find((c) => c.name.toLowerCase() === query.toLowerCase())
      || ch.find((c) => c.name.toLowerCase().startsWith(query.toLowerCase()));
  }

  public resolveRole(query: string, { roles }: Guild): Role | undefined {
    return roles.find((r) => r.id === query.replace(/[<@&>]/g, '') || r.name === query)
      || roles.find((r) => r.name.toLowerCase() === query.toLowerCase())
      || roles.find((r) => r.name.toLowerCase().startsWith(query.toLowerCase()));
  }

  public resolveMember(query: string, { members }: Guild): Member | undefined {
    return members.find((m) => `${m.username}#${m.discriminator}` === query || m.username === query || m.id === query.replace(/[<@!>]/g, '') || m.nick === query) // Exact match for mention, username+discrim, username and user ID
      || members.find((m) => `${m.username.toLowerCase()}#${m.discriminator}` === query.toLowerCase() || m.username.toLowerCase() === query.toLowerCase() || (m.nick && m.nick.toLowerCase() === query.toLowerCase())) // Case insensitive match for username+discrim, username
      || members.find((m) => m.username.toLowerCase().startsWith(query.toLowerCase()) || (m.nick && m.nick.toLowerCase().startsWith(query.toLowerCase())));
  }

  public async handleError(error: Error, message?: Message, command?: Command, disable = true): Promise<void> {
    try {
      this.signale.error(error);
      const info: WebhookPayload = { content: `\`\`\`js\n${error.stack || error}\n\`\`\``, embeds: [] };
      if (message) {
        const embed = new RichEmbed();
        embed.setColor('FF0000');
        embed.setAuthor(`Error caused by ${message.author.username}#${message.author.discriminator}`, message.author.avatarURL);
        embed.setTitle('Message content');
        embed.setDescription(message.content);
        embed.addField('User', `${message.author.mention} (\`${message.author.id}\`)`, true);
        embed.addField('Channel', message.channel.mention, true);
        let guild: string;
        if (message.channel instanceof PrivateChannel || message.channel instanceof GroupChannel) guild = '@me';
        else guild = message.channel.guild.id;
        embed.addField('Message link', `[Click here](https://discordapp.com/channels/${guild}/${message.channel.id}/${message.id})`, true);
        embed.setTimestamp(new Date(message.timestamp));
        info.embeds.push(embed);
      }
      await this.client.executeWebhook(this.client.config.webhookID, this.client.config.webhookToken, info);
      const msg = message ? message.content.slice(this.client.config.prefix.length).trim().split(/ +/g) : [];
      if (command && disable) this.resolveCommand(msg).then((c) => { c.cmd.enabled = false; });
      if (message) message.channel.createMessage(`***${this.emojis.ERROR} An unexpected error has occured - please contact a Staff member.${command && disable ? ' This command has been disabled.' : ''}***`);
    } catch (err) {
      this.signale.error(err);
    }
  }

  public splitString(string: string, length: number): string[] {
    if (!string) return [];
    if (Array.isArray(string)) string = string.join('\n');
    if (string.length <= length) return [string];
    const arrayString: string[] = [];
    let str: string = '';
    let pos: number;
    while (string.length > 0) {
      pos = string.length > length ? string.lastIndexOf('\n', length) : string.length;
      if (pos > length) pos = length;
      str = string.substr(0, pos);
      string = string.substr(pos);
      arrayString.push(str);
    }
    return arrayString;
  }

  public splitFields(fields: { name: string, value: string, inline?: boolean }[]): { name: string, value: string, inline?: boolean }[][] {
    let index = 0;
    const array: {name: string, value: string, inline?: boolean}[][] = [[]];
    while (fields.length) {
      if (array[index].length >= 25) { index += 1; array[index] = []; }
      array[index].push(fields[0]); fields.shift();
    }
    return array;
  }

  public splitArray<T>(array: T[], count: number) {
    const finalArray: T[][] = [];
    while (array.length) {
      finalArray.push(array.splice(0, count));
    }
    return finalArray;
  }

  public decimalToHex(int: number): string {
    const hex = int.toString(16);
    return '#000000'.substring(0, 7 - hex.length) + hex;
  }

  public randomNumber(min: number, max: number): number {
    return Math.round(Math.random() * (max - min) + min);
  }

  public encode(arg: string) {
    return arg.split('').map((x) => x.charCodeAt(0) / 400);
  }

  public normalize(string) {
    const input = [];
    // eslint-disable-next-line no-plusplus
    for (let i = 0; i < string.length; i++) {
      input.push(string.charCodeAt(i) / 1000);
    }
    return input;
  }

  public convert_ascii(ascii: []) {
    let string = '';
    // eslint-disable-next-line no-plusplus
    for (let i = 0; i < ascii.length; i++) {
      string += String.fromCharCode(ascii[i] * 4000);
    }
    return string;
  }
}