import config from "@/config/index.js";
import { FILE_TYPE_BROWSERSAFE, MAX_NOTE_TEXT_LENGTH } from "@/const.js";
import { fetchMeta } from "@/misc/fetch-meta.js";
import { AnnouncementReads, Announcements, Emojis, Instances, Notes, UserProfiles, Users } from "@/models/index.js";
import { IsNull } from "typeorm";
import { awaitAll } from "@/prelude/await-all.js";
import { UserConverter } from "@/server/api/mastodon/converters/user.js";
import { Announcement } from "@/models/entities/announcement.js";
import { ILocalUser, User } from "@/models/entities/user.js";
import { AnnouncementConverter } from "@/server/api/mastodon/converters/announcement.js";
import { genId } from "@/misc/gen-id.js";
import * as Acct from "@/misc/acct.js";
import { UserHelpers } from "@/server/api/mastodon/helpers/user.js";
import { generateMutedUserQueryForUsers } from "@/server/api/common/generate-muted-user-query.js";
import { generateBlockQueryForUsers } from "@/server/api/common/generate-block-query.js";
import { uniqBy } from "@/prelude/array.js";
import { EmojiConverter } from "@/server/api/mastodon/converters/emoji.js";
import { populateEmojis } from "@/misc/populate-emojis.js";
import { NoteConverter } from "@/server/api/mastodon/converters/note.js";
import { VisibilityConverter } from "@/server/api/mastodon/converters/visibility.js";
import { MastoContext } from "@/server/api/mastodon/index.js";

export class MiscHelpers {
    public static async getInstance(ctx: MastoContext): Promise<MastodonEntity.Instance> {
        const userCount = Users.count({ where: { host: IsNull() } });
        const noteCount = Notes.count({ where: { userHost: IsNull() } });
        const instanceCount = Instances.count({ cache: 3600000 });
        const contact = await Users.findOne({
            where: {
                host: IsNull(),
                isAdmin: true,
                isDeleted: false,
                isSuspended: false,
            },
            order: { id: "ASC" },
        })
            .then(p => p ? UserConverter.encode(p, ctx) : null);
        const meta = await fetchMeta(true);

        const res = {
            uri: config.domain,
            title: meta.name || "Iceshrimp",
            short_description:
                meta.description?.substring(0, 50) || "This is an Iceshrimp instance. It doesn't seem to have a description.",
            description:
                meta.description ||
                "This is an Iceshrimp instance. It doesn't seem to have a description.",
            email: meta.maintainerEmail || "",
            version: `4.2.1 (compatible; Iceshrimp ${config.version})`,
            urls: {
                streaming_api: `${config.url.replace(/^http(?=s?:\/\/)/, "ws")}`,
            },
            stats: awaitAll({
                user_count: userCount,
                status_count: noteCount,
                domain_count: instanceCount,
            }),
            max_toot_chars: MAX_NOTE_TEXT_LENGTH,
            thumbnail: meta.bannerUrl || "/static-assets/transparent.png",
            languages: meta.langs,
            registrations: !meta.disableRegistration,
            approval_required: meta.disableRegistration,
            invites_enabled: meta.disableRegistration,
            configuration: {
                accounts: {
                    max_featured_tags: 20,
                },
                statuses: {
                    supported_mime_types: ['text/x.misskeymarkdown'],
                    max_characters: MAX_NOTE_TEXT_LENGTH,
                    max_media_attachments: 16,
                    characters_reserved_per_url: 23,
                },
                media_attachments: {
                    supported_mime_types: FILE_TYPE_BROWSERSAFE,
                    image_size_limit: 10485760,
                    image_matrix_limit: 16777216,
                    video_size_limit: 41943040,
                    video_frame_limit: 60,
                    video_matrix_limit: 2304000,
                },
                polls: {
                    max_options: 10,
                    max_characters_per_option: 50,
                    min_expiration: 50,
                    max_expiration: 2629746,
                },
                reactions: {
                    max_reactions: 1,
                },
            },
            contact_account: contact,
            rules: [],
        };

        return awaitAll(res);
    }

    public static async getAnnouncements(includeRead: boolean = false, ctx: MastoContext): Promise<MastodonEntity.Announcement[]> {
        const user = ctx.user as ILocalUser;

        if (includeRead) {
            const [announcements, reads] = await Promise.all([
                Announcements.createQueryBuilder("announcement")
                    .orderBy({ "announcement.id": "DESC" })
                    .getMany(),
                AnnouncementReads.findBy({ userId: user.id })
                    .then(p => p.map(x => x.announcementId))
            ]);

            return Promise.all(announcements.map(async p => AnnouncementConverter.encode(p, reads.includes(p.id))));
        }

        const sq = AnnouncementReads.createQueryBuilder("reads")
            .select("reads.announcementId")
            .where("reads.userId = :userId");

        const query = Announcements.createQueryBuilder("announcement")
            .where(`announcement.id NOT IN (${sq.getQuery()})`)
            .orderBy({ "announcement.id": "DESC" })
            .setParameter("userId", user.id);

        return query.getMany()
            .then(p => Promise.all(p.map(async x => AnnouncementConverter.encode(x, false))));
    }

    public static async dismissAnnouncement(announcement: Announcement, ctx: MastoContext): Promise<void> {
        const user = ctx.user as ILocalUser;
        const exists = await AnnouncementReads.exist({ where: { userId: user.id, announcementId: announcement.id } });
        if (!exists) {
            await AnnouncementReads.insert({
                id: genId(),
                createdAt: new Date(),
                userId: user.id,
                announcementId: announcement.id
            });
        }
    }

    public static async getFollowSuggestions(limit: number, ctx: MastoContext): Promise<MastodonEntity.SuggestedAccount[]> {
        const user = ctx.user as ILocalUser;
        const results: Promise<MastodonEntity.SuggestedAccount[]>[] = [];

        const pinned = fetchMeta().then(meta => Promise.all(
                meta.pinnedUsers
                    .map((acct) => Acct.parse(acct))
                    .map((acct) =>
                        Users.findOneBy({
                            usernameLower: acct.username.toLowerCase(),
                            host: acct.host ?? IsNull(),
                        }))
            )
                .then(p => p.filter(x => !!x) as User[])
                .then(p => UserConverter.encodeMany(p, ctx))
                .then(p => p.map(x => {
                    return { source: "staff", account: x } as MastodonEntity.SuggestedAccount
                }))
        );

        const query = Users.createQueryBuilder("user")
            .where("user.isExplorable = TRUE")
            .andWhere("user.host IS NULL")
            .orderBy("user.followersCount", "DESC")
            .andWhere("user.updatedAt > :date", {
                date: new Date(Date.now() - 1000 * 60 * 60 * 24 * 5),
            });

        generateMutedUserQueryForUsers(query, user);
        generateBlockQueryForUsers(query, user);

        const global = query
            .take(limit)
            .getMany()
            .then(p => UserConverter.encodeMany(p, ctx))
            .then(p => p.map(x => {
                return { source: "global", account: x } as MastodonEntity.SuggestedAccount
            }));

        results.push(pinned);
        results.push(global);


        return Promise.all(results).then(p => uniqBy(p.flat(), (x: MastodonEntity.SuggestedAccount) => x.account.id).slice(0, limit));
    }

    public static async getCustomEmoji() {
        return Emojis.find({
                where: {
                    host: IsNull(),
                },
                order: {
                    category: "ASC",
                    name: "ASC",
                },
                cache: {
                    id: "meta_emojis",
                    milliseconds: 3600000, // 1 hour
                }
            }
        )
            .then(dbRes => populateEmojis(dbRes.map(p => p.name), null)
                .then(p => p.map(x => EmojiConverter.encode(x))
                    .map(x => {
                        return {
                            ...x,
                            category: dbRes.find(y => y.name === x.shortcode)?.category ?? undefined
                        }
                    })
                )
            );
    }

    public static async getTrendingStatuses(limit: number = 20, offset: number = 0, ctx: MastoContext): Promise<MastodonEntity.Status[]> {
        if (limit > 40) limit = 40;
        const query = Notes.createQueryBuilder("note")
            .addSelect("note.score")
            .andWhere("note.score > 0")
            .andWhere("note.createdAt > :date", { date: new Date(Date.now() - 1000 * 60 * 60 * 24) })
            .andWhere("note.visibility = 'public'")
            .andWhere("note.userHost IS NULL")
            .orderBy("note.score", "DESC");

        return query
            .skip(offset)
            .take(limit)
            .getMany()
            .then(result => NoteConverter.encodeMany(result, ctx));
    }

    public static async getTrendingHashtags(limit: number = 10, offset: number = 0): Promise<MastodonEntity.Tag[]> {
        if (limit > 20) limit = 20;
        return [];
        //FIXME: This was already implemented in api/endpoints/hashtags/trend.ts, but the implementation is sketchy at best. Rewrite from scratch.
    }

    public static getPreferences(ctx: MastoContext): Promise<MastodonEntity.Preferences> {
        const user = ctx.user as ILocalUser;
        const profile = UserProfiles.findOneByOrFail({ userId: user.id });
        const sensitive = profile.then(p => p.alwaysMarkNsfw);
        const language = profile.then(p => p.lang);
        const privacy = UserHelpers.getDefaultNoteVisibility(ctx)
            .then(p => VisibilityConverter.encode(p));

        const res = {
            "posting:default:visibility": privacy,
            "posting:default:sensitive": sensitive,
            "posting:default:language": language,
            "reading:expand:media": "default" as "default" | "show_all" | "hide_all", //FIXME: see below
            "reading:expand:spoilers": false //FIXME: store this on server instead of client
        }

        return awaitAll(res);
    }
}