import signale from 'signale';
import { Member, Message, Guild, PrivateChannel, GroupChannel } from 'eris';
import { Client, Command, RichEmbed } from '.';
import { statusMessages as emotes } from '../configs/emotes.json';

export default class Util {
  public client: Client;

  public signale: signale.Signale;

  constructor(client: Client) {
    this.client = client;
    this.signale = signale;
    this.signale.config({
      displayDate: true,
      displayTimestamp: true,
      displayFilename: true,
    });
  }

  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 {
      // let resolvedCommand: Command;
      // eslint-disable-next-line no-param-reassign
      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 resolveMember(query: string, { members }: Guild): Member | undefined {
    let queries = query.split(' ').slice(0, 10).join(' ');
    let member = members.find((m) => m.mention.replace('!', '') === queries.replace('!', '') || `${m.username}#${m.discriminator}` === query || m.username === queries || m.id === queries || m.nick === queries) // Exact match for mention, username+discrim, username and user ID
        || members.find((m) => `${m.username.toLowerCase()}#${m.discriminator}` === queries.toLowerCase() || m.username.toLowerCase() === queries.toLowerCase() || (m.nick && m.nick.toLowerCase() === queries.toLowerCase())) // Case insensitive match for username+discrim, username
        || members.find((m) => m.username.toLowerCase().startsWith(queries.toLowerCase()) || (m.nick && m.nick.toLowerCase().startsWith(queries.toLowerCase())));
    if (queries.length > 1 && !member) {
      while (!member && queries.length > 0) {
        queries = queries.split(' ').slice(0, queries.length - 1).join(' ');
        member = members.find((m) => m.mention.replace('!', '') === queries.replace('!', '') || `${m.username}#${m.discriminator}` === query || m.username === queries || m.id === queries || m.nick === queries) // Exact match for mention, username+discrim, username and user ID
            || members.find((m) => `${m.username.toLowerCase()}#${m.discriminator}` === queries.toLowerCase() || m.username.toLowerCase() === queries.toLowerCase() || (m.nick && m.nick.toLowerCase() === queries.toLowerCase())) // Case insensitive match for username+discrim, username
            || members.find((m) => m.username.toLowerCase().startsWith(queries.toLowerCase()) || (m.nick && m.nick.toLowerCase().startsWith(queries.toLowerCase())));
      }
    }
    return member;
  }

  public async handleError(error: Error, message?: Message, command?: Command): Promise<void> {
    try {
      this.signale.error(error);
      const info = { content: `\`\`\`js\n${error.stack}\n\`\`\``, embed: null };
      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}/${message.id})`, true);
        embed.setTimestamp(new Date(message.timestamp));
        info.embed = embed;
      }
      await this.client.createMessage('595788220764127272', info);
      const msg = message.content.slice(this.client.config.prefix.length).trim().split(/ +/g);
      // eslint-disable-next-line no-param-reassign
      if (command) this.resolveCommand(msg).then((c) => { c.cmd.enabled = false; });
      if (message) message.channel.createMessage(`***${this.emojis.ERROR} An unexpected error has occured - please contact a Faculty Marshal.${command ? ' This command has been disabled.' : ''}***`);
    } catch (err) {
      this.signale.error(err);
    }
  }
}