module.exports = class Util {
  static chunk(arr, size) {
    const temp = [];
    for (let i = 0; i < arr.length; i += size) {
      temp.push(arr.slice(i, i + size));
    }
    return temp;
  }

  static get paginationEmojis() {
    return ["◀", "⛔", "▶"];
  }

  static async pagination(msg, author, contents, init = true, currPage = 0) {
    if (init) for (const emoji of this.paginationEmojis) await msg.react(emoji);
    const filter = (reaction, user) => {
      return (
        this.paginationEmojis.includes(reaction.emoji.name) &&
        user.id === author.id
      );
    };
    const collector = msg.createReactionCollector({
      filter,
      max: 1,
      time: 90000,
    });
    collector
      .on("collect", reaction => {
        reaction.users.remove(author);
        const emoji = reaction.emoji.name;
        if (emoji === this.paginationEmojis[0]) currPage--;
        if (emoji === this.paginationEmojis[1]) return collector.stop();
        if (emoji === this.paginationEmojis[2]) currPage++;
        currPage =
          ((currPage % contents.length) + contents.length) % contents.length;
        const embed = msg.embeds[0]
          .setDescription(contents[currPage])
          .setFooter(`Page ${currPage + 1} of ${contents.length}.`);
        msg.edit({ embeds: [embed] });
        this.pagination(msg, author, contents, false, currPage);
      })
      .on("end", (_, reason) => {
        if (["time", "user"].includes(reason)) msg.reactions.removeAll();
      });
  }
};