import { IsNull, LessThan } from "typeorm";
import config from "../../config/index.js";
import * as url from "../../prelude/url.js";
import { renderActivity } from "../../remote/activitypub/renderer/index.js";
import renderOrderedCollection from "../../remote/activitypub/renderer/ordered-collection.js";
import renderOrderedCollectionPage from "../../remote/activitypub/renderer/ordered-collection-page.js";
import renderFollowUser from "../../remote/activitypub/renderer/follow-user.js";
import { Users, Followings, UserProfiles } from "../../models/index.js";
import { checkFetch } from "../../remote/activitypub/check-fetch.js";
import { fetchMeta } from "../../misc/fetch-meta.js";
import { setResponseType } from "../activitypub.js";
export default (async (ctx)=>{
    const verify = await checkFetch(ctx.req);
    if (verify !== 200) {
        ctx.status = verify;
        return;
    }
    const userId = ctx.params.user;
    const cursor = ctx.request.query.cursor;
    if (cursor != null && typeof cursor !== "string") {
        ctx.status = 400;
        return;
    }
    const page = ctx.request.query.page === "true";
    const user = await Users.findOneBy({
        id: userId,
        host: IsNull()
    });
    if (user == null) {
        ctx.status = 404;
        return;
    }
    //#region Check ff visibility
    const profile = await UserProfiles.findOneByOrFail({
        userId: user.id
    });
    if (profile.ffVisibility === "private") {
        ctx.status = 403;
        ctx.set("Cache-Control", "public, max-age=30");
        return;
    } else if (profile.ffVisibility === "followers") {
        ctx.status = 403;
        ctx.set("Cache-Control", "public, max-age=30");
        return;
    }
    //#endregion
    const limit = 10;
    const partOf = `${config.url}/users/${userId}/followers`;
    if (page) {
        const query = {
            followeeId: user.id
        };
        // カーソルが指定されている場合
        if (cursor) {
            query.id = LessThan(cursor);
        }
        // Get followers
        const followings = await Followings.find({
            where: query,
            take: limit + 1,
            order: {
                id: -1
            }
        });
        // 「次のページ」があるかどうか
        const inStock = followings.length === limit + 1;
        if (inStock) followings.pop();
        const renderedFollowers = await Promise.all(followings.map((following)=>renderFollowUser(following.followerId)));
        const rendered = renderOrderedCollectionPage(`${partOf}?${url.query({
            page: "true",
            cursor
        })}`, user.followersCount, renderedFollowers, partOf, undefined, inStock ? `${partOf}?${url.query({
            page: "true",
            cursor: followings[followings.length - 1].id
        })}` : undefined);
        ctx.body = renderActivity(rendered);
        setResponseType(ctx);
    } else {
        // index page
        const rendered = renderOrderedCollection(partOf, user.followersCount, `${partOf}?page=true`);
        ctx.body = renderActivity(rendered);
        setResponseType(ctx);
    }
    const meta = await fetchMeta();
    if (meta.secureMode || meta.privateMode) {
        ctx.set("Cache-Control", "private, max-age=0, must-revalidate");
    } else {
        ctx.set("Cache-Control", "public, max-age=180");
    }
});