import discord from 'discord.js';
import {HydratedDocument} from 'mongoose';

import {logger} from '../logger';
import {config} from '../config';
import {reactPreprocess} from '../functions/react-preprocess';
import {Alias, aliasModel} from '../models/Alias';
import {Guild, guildModel} from '../models/Guild';
import {Image, imageModel} from '../models/Image';

export async function handleReactImage(message: discord.Message): Promise<void>{
  try{
    if(!message.guild || !message.guild.id || !message.content) return;
    const guild: HydratedDocument<Guild> | null = 
      await guildModel.findOne({id: message.guild.id});
    if(!guild) return; // not in guild
    const alias: HydratedDocument<Alias> | null = 
      await aliasModel.findOne(
        {guild: guild, text: reactPreprocess(message.content)}
      );
    if(!alias) return; // alias not exist
    if(!alias.images.length) return; // alias not linked

    const chosenImage: Image = 
      alias.images[Math.floor(Math.random() * alias.images.length)];
    const image: HydratedDocument<Image> | null = 
      await imageModel.findById(chosenImage._id);
    if(!image) 
      throw Error('image not exist');

    await message.channel.send({
      content: `${config.httpServer.external.url}/${image._id}${image.extension}`
    });
  }catch(err: unknown){
    let errMsg;
    if(err instanceof Error) errMsg = err.message;
    else errMsg = String(errMsg);
    logger.error(`While executing "handleReactImage", ${errMsg}`);
  }
}