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


import { cacheHandlers } from "../../cache.ts";
import { rest } from "../../rest/rest.ts";
import { structures } from "../../structures/mod.ts";
import { DiscordChannelTypes } from "../../types/channels/channel_types.ts";
import { Errors } from "../../types/discordeno/errors.ts";
import { DiscordAllowedMentionsTypes } from "../../types/messages/allowed_mentions_types.ts";
import type { CreateMessage } from "../../types/messages/create_message.ts";
import type { Message } from "../../types/messages/message.ts";
import type { PermissionStrings } from "../../types/permissions/permission_strings.ts";
import { endpoints } from "../../util/constants.ts";
import { requireBotChannelPermissions } from "../../util/permissions.ts";
import { snakelize, validateComponents } from "../../util/utils.ts";
import { validateLength } from "../../util/validate_length.ts";

/** Send a message to the channel. Requires SEND_MESSAGES permission. */
export async function sendMessage(channelId: bigint, content: string | CreateMessage) {
  if (typeof content === "string") content = { content };

  const channel = await cacheHandlers.get("channels", channelId);
  if (channel) {
    if (
      ![
        DiscordChannelTypes.DM,
        DiscordChannelTypes.GuildNews,
        DiscordChannelTypes.GuildText,
        DiscordChannelTypes.GuildPublicThread,
        DiscordChannelTypes.GuildPivateThread,
        DiscordChannelTypes.GuildNewsThread,
      ].includes(channel.type)
    ) {
      throw new Error(Errors.CHANNEL_NOT_TEXT_BASED);
    }

    const requiredPerms: Set<PermissionStrings> = new Set(["SEND_MESSAGES", "VIEW_CHANNEL"]);

    if (content.tts) requiredPerms.add("SEND_TTS_MESSAGES");
    if (content.embed) requiredPerms.add("EMBED_LINKS");
    if (content.messageReference?.messageId || content.allowedMentions?.repliedUser) {
      requiredPerms.add("READ_MESSAGE_HISTORY");
    }

    await requireBotChannelPermissions(channelId, [...requiredPerms]);
  }

  // Use ... for content length due to unicode characters and js .length handling
  if (content.content && !validateLength(content.content, { max: 2000 })) {
    throw new Error(Errors.MESSAGE_MAX_LENGTH);
  }

  if (content.allowedMentions) {
    if (content.allowedMentions.users?.length) {
      if (content.allowedMentions.parse?.includes(DiscordAllowedMentionsTypes.UserMentions)) {
        content.allowedMentions.parse = content.allowedMentions.parse.filter((p) => p !== "users");
      }

      if (content.allowedMentions.users.length > 100) {
        content.allowedMentions.users = content.allowedMentions.users.slice(0, 100);
      }
    }

    if (content.allowedMentions.roles?.length) {
      if (content.allowedMentions.parse?.includes(DiscordAllowedMentionsTypes.RoleMentions)) {
        content.allowedMentions.parse = content.allowedMentions.parse.filter((p) => p !== "roles");
      }

      if (content.allowedMentions.roles.length > 100) {
        content.allowedMentions.roles = content.allowedMentions.roles.slice(0, 100);
      }
    }
  }

  if (content.components?.length) {
    validateComponents(content.components);
  }

  const result = await rest.runMethod<Message>(
    "post",
    endpoints.CHANNEL_MESSAGES(channelId),
    snakelize({
      ...content,
      ...(content.messageReference?.messageId
        ? {
            messageReference: {
              ...content.messageReference,
              failIfNotExists: content.messageReference.failIfNotExists === true,
            },
          }
        : {}),
    })
  );

  return structures.createDiscordenoMessage(result);
}