// Loaded from https://deno.land/x/discordeno@11.0.0-rc.2/src/handlers/messages/MESSAGE_REACTION_REMOVE.ts


import { eventHandlers } from "../../bot.ts";
import { cacheHandlers } from "../../cache.ts";
import type { DiscordGatewayPayload } from "../../types/gateway/gateway_payload.ts";
import type { MessageReactionRemove } from "../../types/messages/message_reaction_remove.ts";
import { snowflakeToBigint } from "../../util/bigint.ts";

export async function handleMessageReactionRemove(data: DiscordGatewayPayload) {
  const payload = data.d as MessageReactionRemove;
  const message = await cacheHandlers.get("messages", snowflakeToBigint(payload.messageId));

  if (message) {
    const reaction = message.reactions?.find(
      (reaction) =>
        // MUST USE == because discord sends null and we use undefined
        reaction.emoji.id == payload.emoji.id && reaction.emoji.name === payload.emoji.name
    );

    if (reaction) {
      reaction.count--;
      if (reaction.count === 0) {
        message.reactions = message.reactions?.filter((r) => r.count !== 0);
      }
      if (!message.reactions?.length) message.reactions = undefined;

      await cacheHandlers.set("messages", message.id, message);
    }
  }

  eventHandlers.reactionRemove?.(payload, message);
}