import got from "got";
import FormData from "form-data";
import fileType from "file-type";
import { nanoid } from "nanoid";
import config from "../../config";

export interface Attachment {
    id: string;
}

export interface Status {
    url: string;
}

export const client = got.extend({
    prefixUrl: config.mastodon.instance,
    headers: {
        Authorization: `Bearer ${config.mastodon.token}`,
    },
});

export async function upload(buf: Buffer, filename: string) {
    const type = await fileType.fromBuffer(buf);

    if (!type) {
        throw new Error("Couldn't determine file type");
    }

    const body = new FormData();
    body.append("file", buf, { filename: `${filename}.${type.ext}`, contentType: type.mime });

    return client.post("api/v1/media", { body }).json<Attachment>();
}

export async function createStatus(
    postUrl: string,
    sourceUrls: readonly string[],
    spoiler: string[],
    attachmentId: string
) {
    let lines = [postUrl];
    for (let i = 0; i < sourceUrls.length; ++i) {
        const url = sourceUrls[i].replace(/(https?):\/\/twitter.com\//, "$1://nitter.net/");
        lines.push(`Source ${i + 1}: ${url}`);
    }

    const spoilerText = spoiler.length ? `CW: ${spoiler.join(", ")}` : undefined;

    return client
        .post("api/v1/statuses", {
            headers: {
                "Idempotency-Key": nanoid(),
            },
            json: {
                status: lines.join("\n"),
                media_ids: [attachmentId],
                sensitive: !!spoilerText,
                spoiler_text: spoilerText,
                visibility: "unlisted",
            },
        })
        .json<Status>();
}