import { Note } from "@/models/entities/note.js";
import { ILocalUser, IRemoteUser, User } from "@/models/entities/user.js";
import {
    Blockings, DriveFiles,
    Followings,
    FollowRequests,
    Mutings,
    NoteFavorites,
    NoteReactions,
    Notes,
    NoteWatchings,
    RegistryItems,
    UserNotePinings,
    UserProfiles,
    Users
} from "@/models/index.js";
import { generateVisibilityQuery } from "@/server/api/common/generate-visibility-query.js";
import { generateMutedUserQuery } from "@/server/api/common/generate-muted-user-query.js";
import { generateBlockedUserQuery } from "@/server/api/common/generate-block-query.js";
import AsyncLock from "async-lock";
import { getUser } from "@/server/api/common/getters.js";
import { PaginationHelpers } from "@/server/api/mastodon/helpers/pagination.js";
import { awaitAll } from "@/prelude/await-all.js";
import createFollowing from "@/services/following/create.js";
import deleteFollowing from "@/services/following/delete.js";
import cancelFollowRequest from "@/services/following/requests/cancel.js";
import createBlocking from "@/services/blocking/create.js";
import deleteBlocking from "@/services/blocking/delete.js";
import { genId } from "@/misc/gen-id.js";
import { Muting } from "@/models/entities/muting.js";
import { publishUserEvent } from "@/services/stream.js";
import { UserConverter } from "@/server/api/mastodon/converters/user.js";
import acceptFollowRequest from "@/services/following/requests/accept.js";
import { rejectFollowRequest } from "@/services/following/reject.js";
import { Brackets, IsNull } from "typeorm";
import { IceshrimpVisibility, VisibilityConverter } from "@/server/api/mastodon/converters/visibility.js";
import { Files } from "formidable";
import { toSingleLast } from "@/prelude/array.js";
import { MediaHelpers } from "@/server/api/mastodon/helpers/media.js";
import { UserProfile } from "@/models/entities/user-profile.js";
import { verifyLink } from "@/services/fetch-rel-me.js";
import { MastoApiError } from "@/server/api/mastodon/middleware/catch-errors.js";
import { MastoContext } from "@/server/api/mastodon/index.js";
import { resolveUser } from "@/remote/resolve-user.js";
import { updatePerson } from "@/remote/activitypub/models/person.js";
import { promiseEarlyReturn } from "@/prelude/promise.js";
import { updateUserProfileData } from "@/services/i/update.js";

export type AccountCache = {
    locks: AsyncLock;
    accounts: MastodonEntity.Account[];
    users: User[];
};

export type updateCredsData = {
    display_name: string;
    note: string;
    locked: boolean;
    bot: boolean;
    discoverable: boolean;
    fields_attributes?: { name: string, value: string }[];
}

type RelationshipType = 'followers' | 'following';

export class UserHelpers {
    public static async followUser(target: User, reblogs: boolean, notify: boolean, ctx: MastoContext): Promise<MastodonEntity.Relationship> {
        //FIXME: implement reblogs & notify params
        const localUser = ctx.user as ILocalUser;
        const following = await Followings.exist({ where: { followerId: localUser.id, followeeId: target.id } });
        const requested = await FollowRequests.exist({ where: { followerId: localUser.id, followeeId: target.id } });
        if (!following && !requested)
            await createFollowing(localUser, target);

        return this.getUserRelationshipTo(target.id, localUser.id);
    }

    public static async unfollowUser(target: User, ctx: MastoContext): Promise<MastodonEntity.Relationship> {
        const localUser = ctx.user as ILocalUser;
        const following = await Followings.exist({ where: { followerId: localUser.id, followeeId: target.id } });
        const requested = await FollowRequests.exist({ where: { followerId: localUser.id, followeeId: target.id } });
        if (following)
            await deleteFollowing(localUser, target);
        if (requested)
            await cancelFollowRequest(target, localUser);

        return this.getUserRelationshipTo(target.id, localUser.id);
    }

    public static async blockUser(target: User, ctx: MastoContext): Promise<MastodonEntity.Relationship> {
        const localUser = ctx.user as ILocalUser;
        const blocked = await Blockings.exist({ where: { blockerId: localUser.id, blockeeId: target.id } });
        if (!blocked)
            await createBlocking(localUser, target);

        return this.getUserRelationshipTo(target.id, localUser.id);
    }

    public static async unblockUser(target: User, ctx: MastoContext): Promise<MastodonEntity.Relationship> {
        const localUser = ctx.user as ILocalUser;
        const blocked = await Blockings.exist({ where: { blockerId: localUser.id, blockeeId: target.id } });
        if (blocked)
            await deleteBlocking(localUser, target);

        return this.getUserRelationshipTo(target.id, localUser.id);
    }

    public static async muteUser(target: User, notifications: boolean = true, duration: number = 0, ctx: MastoContext): Promise<MastodonEntity.Relationship> {
        //FIXME: respect notifications parameter
        const localUser = ctx.user as ILocalUser;
        const muted = await Mutings.exist({ where: { muterId: localUser.id, muteeId: target.id } });
        if (!muted) {
            await Mutings.insert({
                id: genId(),
                createdAt: new Date(),
                expiresAt: duration === 0 ? null : new Date(new Date().getTime() + (duration * 1000)),
                muterId: localUser.id,
                muteeId: target.id,
            } as Muting);

            publishUserEvent(localUser.id, "mute", target);

            NoteWatchings.delete({
                userId: localUser.id,
                noteUserId: target.id,
            });
        }

        return this.getUserRelationshipTo(target.id, localUser.id);
    }

    public static async unmuteUser(target: User, ctx: MastoContext): Promise<MastodonEntity.Relationship> {
        const localUser = ctx.user as ILocalUser;
        const muting = await Mutings.findOneBy({ muterId: localUser.id, muteeId: target.id });
        if (muting) {
            await Mutings.delete({
                id: muting.id,
            });

            publishUserEvent(localUser.id, "unmute", target);
        }

        return this.getUserRelationshipTo(target.id, localUser.id);
    }

    public static async acceptFollowRequest(target: User, ctx: MastoContext): Promise<MastodonEntity.Relationship> {
        const localUser = ctx.user as ILocalUser;
        const pending = await FollowRequests.exist({ where: { followerId: target.id, followeeId: localUser.id } });
        if (pending)
            await acceptFollowRequest(localUser, target);
        return this.getUserRelationshipTo(target.id, localUser.id);
    }

    public static async rejectFollowRequest(target: User, ctx: MastoContext): Promise<MastodonEntity.Relationship> {
        const localUser = ctx.user as ILocalUser;
        const pending = await FollowRequests.exist({ where: { followerId: target.id, followeeId: localUser.id } });
        if (pending)
            await rejectFollowRequest(localUser, target);
        return this.getUserRelationshipTo(target.id, localUser.id);
    }

    public static async updateCredentials(ctx: MastoContext): Promise<MastodonEntity.Account> {
        const user = ctx.user as ILocalUser;
        const files = (ctx.request as any).files as Files | undefined;
        const formData = (ctx.request as any).body as updateCredsData;

        const updates: Partial<User> = {};
        const profileUpdates: Partial<UserProfile> = {};

        const avatar = toSingleLast(files?.avatar);
        const header = toSingleLast(files?.header);

        if (avatar) {
            const file = await MediaHelpers.uploadMediaBasic(avatar, ctx);
            updates.avatarId = file.id;
            updates.avatarBlurhash = file.blurhash;
            updates.avatarUrl = DriveFiles.getDatabasePrefetchUrl(file, true);
        }

        if (header) {
            const file = await MediaHelpers.uploadMediaBasic(header, ctx);
            updates.bannerId = file.id;
            updates.bannerBlurhash = file.blurhash;
            updates.bannerUrl = DriveFiles.getDatabasePrefetchUrl(file, false);
        }

        if (formData.fields_attributes) {
            profileUpdates.fields = await Promise.all(formData.fields_attributes.map(async field => {
                if (!(field.name.trim() === "" && field.value.trim() === "")) {
                    if (field.name.trim() === "") throw new MastoApiError(400, "Field name can not be empty");
                    if (field.value.trim() === "") throw new MastoApiError(400, "Field value can not be empty");
                }
                const verified = field.value.startsWith("http")
                    ? (await promiseEarlyReturn(verifyLink(field.value, user.username), 1500)) ?? false
                    : undefined;
                return {
                    ...field,
                    verified
                };
            })).then(p => p.filter(field => field.name.trim().length > 0 && field.value.length > 0));
        }

        if (formData.display_name) updates.name = formData.display_name;
        if (formData.note) profileUpdates.description = formData.note;
        if (formData.locked) updates.isLocked = formData.locked;
        if (formData.bot) updates.isBot = formData.bot;
        if (formData.discoverable) updates.isExplorable = formData.discoverable;

        await updateUserProfileData(user, null, updates, profileUpdates, false);

        return this.verifyCredentials(ctx);
    }

    public static async verifyCredentials(ctx: MastoContext): Promise<MastodonEntity.Account> {
        const user = ctx.user as ILocalUser;
        const acct = UserConverter.encode(user, ctx);
        const profile = UserProfiles.findOneByOrFail({ userId: user.id });
        const privacy = this.getDefaultNoteVisibility(ctx);
        const fields = profile.then(profile => profile.fields.map(field => {
            return {
                name: field.name,
                value: field.value
            } as MastodonEntity.Field;
        }));
        return acct.then(acct => {
            const source = {
                note: profile.then(profile => profile.description ?? ''),
                fields: fields,
                privacy: privacy.then(p => VisibilityConverter.encode(p)),
                sensitive: profile.then(p => p.alwaysMarkNsfw),
                language: profile.then(p => p.lang ?? ''),
            };

            const result = {
                ...acct,
                source: awaitAll(source)
            };

            return awaitAll(result);
        });
    }

    public static async getUserFromAcct(acct: string): Promise<User> {
        const split = acct.toLowerCase().split('@');
        if (split.length > 2) throw new Error('Invalid acct');
        return split[1] == null
            ? Users.findOneBy({ usernameLower: split[0], host: split[1] ?? IsNull() })
                .then(p => {
                    if (p) return p;
                    throw new MastoApiError(404);
                })
            : resolveUser(split[0], split[1], 'no-refresh').catch(() => {
                throw new MastoApiError(404);
            });
    }

    public static async getUserMutes(maxId: string | undefined, sinceId: string | undefined, minId: string | undefined, limit: number = 40, ctx: MastoContext): Promise<MastodonEntity.MutedAccount[]> {
        if (limit > 80) limit = 80;

        const user = ctx.user as ILocalUser;
        const query = PaginationHelpers.makePaginationQuery(
            Mutings.createQueryBuilder("muting"),
            sinceId,
            maxId,
            minId
        );

        query.andWhere("muting.muterId = :userId", { userId: user.id })
            .innerJoinAndSelect("muting.mutee", "mutee");

        return PaginationHelpers.execQueryLinkPagination(query, limit, minId !== undefined, ctx)
            .then(async mutes => {
                const users = mutes
                    .map(p => p.mutee)
                    .filter(p => p) as User[];

                return await UserConverter.encodeMany(users, ctx)
                    .then(res => res.map(m => {
                        const muting = mutes.find(acc => acc.muteeId === m.id);
                        return {
                            ...m,
                            mute_expires_at: muting?.expiresAt?.toISOString() ?? null
                        } as MastodonEntity.MutedAccount
                    }));
            });
    }

    public static async getUserBlocks(maxId: string | undefined, sinceId: string | undefined, minId: string | undefined, limit: number = 40, ctx: MastoContext): Promise<User[]> {
        if (limit > 80) limit = 80;

        const user = ctx.user as ILocalUser;
        const query = PaginationHelpers.makePaginationQuery(
            Blockings.createQueryBuilder("blocking"),
            sinceId,
            maxId,
            minId
        );

        query.andWhere("blocking.blockerId = :userId", { userId: user.id })
            .innerJoinAndSelect("blocking.blockee", "blockee");

        return PaginationHelpers.execQueryLinkPagination(query, limit, minId !== undefined, ctx)
            .then(blocks => {
                return blocks
                    .map(p => p.blockee)
                    .filter(p => p) as User[];
            });
    }

    public static async getUserFollowRequests(maxId: string | undefined, sinceId: string | undefined, minId: string | undefined, limit: number = 40, ctx: MastoContext): Promise<User[]> {
        if (limit > 80) limit = 80;

        const user = ctx.user as ILocalUser;
        const query = PaginationHelpers.makePaginationQuery(
            FollowRequests.createQueryBuilder("request"),
            sinceId,
            maxId,
            minId
        );

        query.andWhere("request.followeeId = :userId", { userId: user.id })
            .innerJoinAndSelect("request.follower", "follower");

        return PaginationHelpers.execQueryLinkPagination(query, limit, minId !== undefined, ctx)
            .then(requests => {
                return requests
                    .map(p => p.follower)
                    .filter(p => p) as User[];
            });
    }

    public static async getUserStatuses(user: User, maxId: string | undefined, sinceId: string | undefined, minId: string | undefined, limit: number = 20, onlyMedia: boolean = false, excludeReplies: boolean = false, excludeReblogs: boolean = false, pinned: boolean = false, tagged: string | undefined, ctx: MastoContext): Promise<Note[]> {
        if (limit > 40) limit = 40;
        const localUser = ctx.user as ILocalUser | null;

        if (tagged !== undefined && tagged.length > 0) {
            //FIXME respect tagged
            return [];
        }

        const query = PaginationHelpers.makePaginationQuery(
            Notes.createQueryBuilder("note"),
            sinceId,
            maxId,
            minId
        )
            .andWhere("note.userId = :userId");

        if (pinned) {
            const sq = UserNotePinings.createQueryBuilder("pin")
                .select("pin.noteId")
                .where("pin.userId = :userId");
            query.andWhere(`note.id IN (${sq.getQuery()})`);
        }

        if (excludeReblogs) {
            query.andWhere(
                new Brackets(qb => {
                    qb.where('note.renoteId IS NULL')
                        .orWhere('note.text IS NOT NULL')
                        .orWhere('note.hasPoll = TRUE')
                        .orWhere("note.fileIds != '{}'");
                }));
        }

        if (excludeReplies) {
            query.leftJoin("note", "thread", "note.threadId = thread.id")
                .andWhere(
                    new Brackets(qb => {
                        qb.where("note.replyId IS NULL")
                            .orWhere(new Brackets(qb => {
                                qb.where('note.mentions = :mentions', { mentions: [] })
                                    .andWhere('thread.userId = :userId')
                            }));
                    }));
        }

        query.leftJoinAndSelect("note.renote", "renote");

        generateVisibilityQuery(query, localUser);
        if (localUser) {
            generateMutedUserQuery(query, localUser, user);
            generateBlockedUserQuery(query, localUser);
        }

        if (onlyMedia) query.andWhere("note.fileIds != '{}'");

        query.andWhere("note.visibility != 'hidden'");
        query.andWhere("note.visibility != 'specified'");

        query.setParameters({ userId: user.id });

        return PaginationHelpers.execQueryLinkPagination(query, limit, minId !== undefined, ctx);
    }

    public static async getUserBookmarks(maxId: string | undefined, sinceId: string | undefined, minId: string | undefined, limit: number = 20, ctx: MastoContext): Promise<Note[]> {
        if (limit > 40) limit = 40;

        const localUser = ctx.user as ILocalUser;
        const query = PaginationHelpers.makePaginationQuery(
            NoteFavorites.createQueryBuilder("favorite"),
            sinceId,
            maxId,
            minId
        )
            .andWhere("favorite.userId = :meId", { meId: localUser.id })
            .leftJoinAndSelect("favorite.note", "note");

        generateVisibilityQuery(query, localUser);

        return PaginationHelpers.execQueryLinkPagination(query, limit, minId !== undefined, ctx)
            .then(res => res.map(p => p.note as Note));
    }

    public static async getUserFavorites(maxId: string | undefined, sinceId: string | undefined, minId: string | undefined, limit: number = 20, ctx: MastoContext): Promise<Note[]> {
        if (limit > 40) limit = 40;

        const localUser = ctx.user as ILocalUser;
        const query = PaginationHelpers.makePaginationQuery(
            NoteReactions.createQueryBuilder("reaction"),
            sinceId,
            maxId,
            minId
        )
            .andWhere("reaction.userId = :meId", { meId: localUser.id })
            .leftJoinAndSelect("reaction.note", "note");

        generateVisibilityQuery(query, localUser);

        return PaginationHelpers.execQueryLinkPagination(query, limit, minId !== undefined, ctx)
            .then(res => res.map(p => p.note as Note));
    }

    private static async getUserRelationships(type: RelationshipType, user: User, maxId: string | undefined, sinceId: string | undefined, minId: string | undefined, limit: number = 40, ctx: MastoContext): Promise<User[]> {
        if (limit > 80) limit = 80;

        const localUser = ctx.user as ILocalUser | null;
        const profile = await UserProfiles.findOneByOrFail({ userId: user.id });
        if (profile.ffVisibility === "private") {
            if (!localUser || user.id !== localUser.id) return [];
        } else if (profile.ffVisibility === "followers") {
            if (!localUser) return [];
            if (user.id !== localUser.id) {
                const isFollowed = await Followings.exist({
                    where: {
                        followeeId: user.id,
                        followerId: localUser.id,
                    },
                });
                if (!isFollowed) return [];
            }
        }

        const query = PaginationHelpers.makePaginationQuery(
            Followings.createQueryBuilder("following"),
            sinceId,
            maxId,
            minId
        );

        if (type === "followers") {
            query.andWhere("following.followeeId = :userId", { userId: user.id })
                .innerJoinAndSelect("following.follower", "follower");
        } else {
            query.andWhere("following.followerId = :userId", { userId: user.id })
                .innerJoinAndSelect("following.followee", "followee");
        }

        return PaginationHelpers.execQueryLinkPagination(query, limit, minId !== undefined, ctx)
            .then(relations => relations
                .map(p => type === "followers" ? p.follower : p.followee)
                .filter(p => p) as User[]);
    }

    public static async getUserFollowers(user: User, maxId: string | undefined, sinceId: string | undefined, minId: string | undefined, limit: number = 40, ctx: MastoContext): Promise<User[]> {
        return this.getUserRelationships('followers', user, maxId, sinceId, minId, limit, ctx);
    }

    public static async getUserFollowing(user: User, maxId: string | undefined, sinceId: string | undefined, minId: string | undefined, limit: number = 40, ctx: MastoContext): Promise<User[]> {
        return this.getUserRelationships('following', user, maxId, sinceId, minId, limit, ctx);
    }

    public static async getUserRelationhipToMany(targetIds: string[], localUserId: string): Promise<MastodonEntity.Relationship[]> {
        return Promise.all(targetIds.map(targetId => this.getUserRelationshipTo(targetId, localUserId)));
    }

    public static async getUserRelationshipTo(targetId: string, localUserId: string): Promise<MastodonEntity.Relationship> {
        const relation = await Users.getRelation(localUserId, targetId);
        const response = {
            id: targetId,
            following: relation.isFollowing,
            followed_by: relation.isFollowed,
            blocking: relation.isBlocking,
            blocked_by: relation.isBlocked,
            muting: relation.isMuted,
            muting_notifications: relation.isMuted,
            requested: relation.hasPendingFollowRequestFromYou,
            domain_blocking: false, //FIXME
            showing_reblogs: !relation.isRenoteMuted,
            endorsed: false,
            notifying: false, //FIXME
            note: '' //FIXME
        }

        return awaitAll(response);
    }

    public static async getUserCached(id: string, ctx: MastoContext): Promise<User> {
        const cache = ctx.cache as AccountCache;
        return cache.locks.acquire(id, async () => {
            const cacheHit = cache.users.find(p => p.id == id);
            if (cacheHit) return cacheHit;
            return getUser(id).then(p => {
                cache.users.push(p);
                return p;
            });
        });
    }

    public static async getUserCachedOr404(id: string, ctx: MastoContext): Promise<User> {
        return this.getUserCached(id, ctx).catch(_ => {
            throw new MastoApiError(404);
        });
    }

    public static async getUserOr404(id: string): Promise<User> {
        return getUser(id).catch(_ => {
            throw new MastoApiError(404);
        });
    }

    public static async updateUserInBackground(user: User) {
        if (Users.isLocalUser(user)) return;
        if (user.lastFetchedAt != null && Date.now() - user.lastFetchedAt.getTime() < 1000 * 60 * 60 * 24) return;

        await Users.update(user.id, {
            lastFetchedAt: new Date(),
        });

        // noinspection ES6MissingAwait
        updatePerson(user.uri!, undefined, undefined, user as IRemoteUser);
    }

    public static getFreshAccountCache(): AccountCache {
        return {
            locks: new AsyncLock(),
            accounts: [],
            users: [],
        };
    }

    public static async getDefaultNoteVisibility(ctx: MastoContext): Promise<IceshrimpVisibility> {
        const user = ctx.user as ILocalUser;
        return RegistryItems.findOneBy({
            domain: IsNull(),
            userId: user.id,
            key: 'defaultNoteVisibility',
            scope: '{client,base}'
        }).then(p => p?.value ?? 'public')
    }
}
