import { EmbedBuilder } from "discord.js";
import type { ChatInputCommandInteraction } from "discord.js";

import { BotError } from "./error";

import say from "./say";
import roll from "./roll";


export interface CommandData {
  name: string;
  description: string;
  ephemeral: boolean;
  admin_only: boolean;
  run: (interaction: ChatInputCommandInteraction) => Promise<any>;
  //
};

const commands: CommandData[] = [say, roll];

//todo: look from config. also, have a config
function is_admin(interaction: ChatInputCommandInteraction): boolean {
  //
  //placeholder
  return true;
}

export default async function run(interaction: ChatInputCommandInteraction) {
  const name = interaction.commandName;

  //help command is "auto-generated"
  if (name === "help") {
    //max of 25 fields per embed, so if too many commands, this section needs a rewrite
    let embeds = [];
    let help_embed = new EmbedBuilder();
    help_embed.setTitle("Help");
    for (const c of commands.filter((c) => !c.admin_only)) {
      help_embed.addFields([{
        name: `/${c.name}`,
        value: c.description,
      }]);
    }
    embeds.push(help_embed);
    if (is_admin(interaction)) {
      let admin_help_embed = new EmbedBuilder();
      admin_help_embed.setTitle("Help (admin only)");
      for (const c of commands.filter((c) => c.admin_only)) {
        admin_help_embed.addFields([{
          name: `/${c.name}`,
          value: c.description,
        }]);
      }
      embeds.push(admin_help_embed);
    }
    return await interaction.reply({ embeds, ephemeral: true });
  }

  const found = commands.find((c) => c.name === name);
  try {
    //admin stuff should be ideally handled by register.ts, but this is a fallback
    if (found.admin_only && !is_admin(interaction)) throw new BotError("Admin permission needed to run that command");
    await found.run(interaction);
  } catch (e) {
    if (e instanceof BotError) {
      //send error message to that channel
      if (interaction.deferred) {
        return await interaction.editReply(String(e));
      } else {
        return await interaction.reply({ content: String(e), ephemeral: found.ephemeral });
      }
    } else {
      //an actual error
      //console.log(e);
      throw e; //crash it
    }
  }
}