import { URL } from "node:url";
import promiseLimit from "promise-limit";
import config from "../../../config/index.js";
import { registerOrFetchInstanceDoc } from "../../../services/register-or-fetch-instance-doc.js";
import { updateUsertags } from "../../../services/update-hashtag.js";
import { Users, Instances, DriveFiles, Followings, UserProfiles, UserPublickeys } from "../../../models/index.js";
import { User } from "../../../models/entities/user.js";
import { UserNotePining } from "../../../models/entities/user-note-pining.js";
import { genId } from "../../../misc/gen-id.js";
import { instanceChart, usersChart } from "../../../services/chart/index.js";
import { UserPublickey } from "../../../models/entities/user-publickey.js";
import { isDuplicateKeyValueError } from "../../../misc/is-duplicate-key-value-error.js";
import { extractDbHost, toPuny } from "../../../misc/convert-host.js";
import { UserProfile } from "../../../models/entities/user-profile.js";
import { toArray } from "../../../prelude/array.js";
import { fetchInstanceMetadata } from "../../../services/fetch-instance-metadata.js";
import { normalizeForSearch } from "../../../misc/normalize-for-search.js";
import { truncate } from "../../../misc/truncate.js";
import { StatusError } from "../../../misc/fetch.js";
import { uriPersonCache } from "../../../services/user-cache.js";
import { publishInternalEvent } from "../../../services/stream.js";
import { db } from "../../../db/postgre.js";
import { apLogger } from "../logger.js";
import { htmlToMfm } from "../misc/html-to-mfm.js";
import { fromHtml } from "../../../mfm/from-html.js";
import { isCollectionOrOrderedCollection, isCollection, getApId, getOneApHrefNullable, isPropertyValue, getApType, isActor } from "../type.js";
import Resolver from "../resolver.js";
import { extractApHashtags } from "./tag.js";
import { resolveNote, extractEmojis } from "./note.js";
import { resolveImage } from "./image.js";
import { getSubjectHostFromUri, getSubjectHostFromRemoteUser, getSubjectHostFromAcctParts } from "../../resolve-user.js";
import { RecursionLimiter } from "../../../models/repositories/user-profile.js";
import { UserConverter } from "../../../server/api/mastodon/converters/user.js";
import fetch from "node-fetch";
const logger = apLogger;
const nameLength = 128;
const summaryLength = 2048;
/**
 * Validate and convert to actor object
 * @param x Fetched object
 * @param uri Fetch target URI
 */ function validateActor(x, uri) {
    const expectHost = extractDbHost(uri);
    if (x == null) {
        throw new Error("invalid Actor: object is null");
    }
    if (!isActor(x)) {
        throw new Error(`invalid Actor type '${x.type}'`);
    }
    if (!(typeof x.id === "string" && x.id.length > 0)) {
        throw new Error("invalid Actor: wrong id");
    }
    if (!(typeof x.inbox === "string" && x.inbox.length > 0 && extractDbHost(x.inbox) === expectHost)) {
        throw new Error("invalid Actor: wrong inbox");
    }
    if (!(typeof x.outbox === "string" && x.outbox.length > 0 && extractDbHost(getApId(x.outbox)) === expectHost)) {
        throw new Error("invalid Actor: wrong outbox");
    }
    const sharedInboxObject = x.sharedInbox ?? (x.endpoints ? x.endpoints.sharedInbox : undefined);
    if (sharedInboxObject != null) {
        const sharedInbox = getApId(sharedInboxObject);
        if (!(typeof sharedInbox === "string" && sharedInbox.length > 0 && extractDbHost(sharedInbox) === expectHost)) {
            throw new Error("invalid Actor: wrong shared inbox");
        }
    }
    if (x.followers != null) {
        x.followers = getApId(x.followers);
        if (!(typeof x.followers === "string" && x.followers.length > 0 && extractDbHost(x.followers) === expectHost)) {
            throw new Error("invalid Actor: wrong followers");
        }
    }
    if (x.following != null) {
        x.following = getApId(x.following);
        if (!(typeof x.following === "string" && x.following.length > 0 && extractDbHost(x.following) === expectHost)) {
            throw new Error("invalid Actor: wrong following");
        }
    }
    if (!(typeof x.preferredUsername === "string" && x.preferredUsername.length > 0 && x.preferredUsername.length <= 128 && /^\w([\w-.]*\w)?$/.test(x.preferredUsername))) {
        throw new Error("invalid Actor: wrong username");
    }
    // These fields are only informational, and some AP software allows these
    // fields to be very long. If they are too long, we cut them off. This way
    // we can at least see these users and their activities.
    if (x.name) {
        if (!(typeof x.name === "string" && x.name.length > 0)) {
            throw new Error("invalid Actor: wrong name");
        }
        x.name = truncate(x.name, nameLength);
    }
    if (x.summary) {
        if (!(typeof x.summary === "string" && x.summary.length > 0)) {
            throw new Error("invalid Actor: wrong summary");
        }
        x.summary = truncate(x.summary, summaryLength);
    }
    const idHost = toPuny(new URL(x.id).host);
    if (idHost !== expectHost) {
        throw new Error("invalid Actor: id has different host");
    }
    if (x.publicKey) {
        if (typeof x.publicKey.id !== "string") {
            throw new Error("invalid Actor: publicKey.id is not a string");
        }
        const publicKeyIdHost = toPuny(new URL(x.publicKey.id).host);
        if (publicKeyIdHost !== expectHost) {
            throw new Error("invalid Actor: publicKey.id has different host");
        }
    }
    if (x.pronouns) {
        if (typeof x.pronouns !== "object") {
            throw new Error("invalid Actor: pronouns is not an object");
        }
        for (const key of Object.keys(x.pronouns)){
            if (typeof x.pronouns[key] !== "string") {
                throw new Error(`invalid Actor: pronouns.${key} is not a string`);
            }
        }
    }
    if (x.canBite && typeof x.canBite !== "string") {
        throw new Error("invalid Actor: canBite is not a string");
    }
    return x;
}
/**
 * Fetch a Person.
 *
 * If the target Person is registered in Iceshrimp, it will be returned.
 */ export async function fetchPerson(uri, resolver) {
    if (typeof uri !== "string") throw new Error("uri is not string");
    const cached = await uriPersonCache.get(uri, true);
    if (cached) return cached;
    // Fetch from the database if the URI points to this server
    if (extractDbHost(uri) === toPuny(config.host)) {
        const id = uri.split("/").pop();
        const u = await Users.findOneBy({
            id
        });
        if (u) await uriPersonCache.set(uri, u);
        return u;
    }
    //#region Returns if already registered with this server
    const user = await Users.findOneBy({
        uri
    });
    if (user != null) {
        await uriPersonCache.set(uri, user);
        return user;
    }
    //#endregion
    return null;
}
/**
 * Create Person.
 */ export async function createPerson(uri, resolver, subjectHost, limiter = new RecursionLimiter()) {
    if (typeof uri !== "string") throw new Error("uri is not string");
    if (extractDbHost(uri) === toPuny(config.host)) {
        throw new StatusError("cannot resolve local user", 400, "cannot resolve local user");
    }
    if (resolver == null) resolver = new Resolver();
    let object = await resolver.resolve(uri);
    let person;
    try {
        person = validateActor(object, uri);
    } catch (e) {
        // Work around GoToSocial issue #1186 (ref: https://github.com/superseriousbusiness/gotosocial/issues/1186)
        if (typeof object.publicKey?.owner !== 'string' || object.inbox != null) throw e;
        logger.info(`Received stub actor, re-resolving with key owner uri: ${object.publicKey.owner}`);
        object = await resolver.resolve(object.publicKey.owner);
        person = validateActor(object, uri);
    }
    logger.info(`Creating the Person: ${person.id}`);
    const usernameLower = person.preferredUsername?.toLowerCase();
    const urlHostname = toPuny(new URL(object.id).hostname);
    const host = subjectHost ?? await getSubjectHostFromUri(object.id) ?? await getSubjectHostFromAcctParts(usernameLower, urlHostname) ?? urlHostname;
    if (usernameLower !== null) {
        let checkUser = await Users.findOneBy({
            usernameLower: usernameLower,
            host: toPuny(new URL(object.id).hostname)
        });
        if (checkUser != null) {
            logger.info('Person already exists');
            if (host != checkUser.host) {
                logger.info(`Updating existing person with canonical account domain (${usernameLower}@${checkUser.host} -> ${usernameLower}@${host})`);
                await Users.update({
                    usernameLower: usernameLower,
                    host: checkUser.host
                }, {
                    host: host
                });
                checkUser.host = host;
            }
            logger.info('Returning existing person');
            return checkUser;
        }
        if (host != toPuny(new URL(object.id).hostname)) {
            checkUser = await Users.findOneBy({
                usernameLower: usernameLower,
                host: host
            });
            if (checkUser != null) {
                logger.info('Person already exists');
                logger.info('Returning existing person');
                return checkUser;
            }
        }
    }
    const { fields } = await analyzeAttachments(person.attachment || []);
    const tags = extractApHashtags(person.tag).map((tag)=>normalizeForSearch(tag)).splice(0, 32);
    const isBot = getApType(object) === "Service";
    const bday = person["vcard:bday"]?.match(/^\d{4}-\d{2}-\d{2}/);
    let url = getOneApHrefNullable(person.url);
    const urlUrl = url != null ? new URL(url) : null;
    const uriUrl = new URL(uri);
    if (urlUrl != null && urlUrl.protocol != 'https:') {
        throw new Error(`unexpected schema of person url: ${url}`);
    }
    if (urlUrl != null && urlUrl.host != uriUrl.host) {
        logger.debug("Person url host doesn't match person uri host, clearing variable");
        url = undefined;
    }
    let followersCount;
    if (typeof person.followers === "string") {
        try {
            let data = await fetch(person.followers, {
                headers: {
                    Accept: "application/json"
                },
                size: 1024 * 1024
            });
            let json_data = JSON.parse(await data.text());
            followersCount = json_data.totalItems;
        } catch  {
            followersCount = undefined;
        }
    }
    let followingCount;
    if (typeof person.following === "string") {
        try {
            let data = await fetch(person.following, {
                headers: {
                    Accept: "application/json"
                },
                size: 1024 * 1024
            });
            let json_data = JSON.parse(await data.text());
            followingCount = json_data.totalItems;
        } catch (e) {
            followingCount = undefined;
        }
    }
    let canBite = "nobody";
    if (person.canBite) {
        if (person.canBite === "https://www.w3.org/ns/activitystreams#Public") {
            canBite = "anyone";
        } else if (person.followers && person.canBite === getApId(person.followers)) {
            canBite = "followers";
        }
    }
    // Prepare objects
    let user = new User({
        id: genId(),
        avatarId: null,
        bannerId: null,
        createdAt: new Date(),
        lastFetchedAt: new Date(),
        name: truncate(person.name, nameLength),
        isLocked: !!person.manuallyApprovesFollowers,
        movedToUri: person.movedTo,
        alsoKnownAs: person.alsoKnownAs,
        isExplorable: !!person.discoverable,
        username: person.preferredUsername,
        usernameLower: person.preferredUsername.toLowerCase(),
        host,
        inbox: person.inbox,
        sharedInbox: person.sharedInbox || (person.endpoints ? person.endpoints.sharedInbox : undefined),
        followersUri: person.followers ? getApId(person.followers) : undefined,
        followersCount: followersCount !== undefined ? followersCount : person.followers && typeof person.followers !== "string" && isCollectionOrOrderedCollection(person.followers) ? person.followers.totalItems : undefined,
        followingCount: followingCount !== undefined ? followingCount : person.following && typeof person.following !== "string" && isCollectionOrOrderedCollection(person.following) ? person.following.totalItems : undefined,
        featured: person.featured ? getApId(person.featured) : undefined,
        uri: person.id,
        tags,
        isBot,
        isCat: person.isCat === true,
        canBite
    });
    const profile = new UserProfile({
        userId: user.id,
        description: person.summary ? await htmlToMfm(truncate(person.summary, summaryLength), person.tag) : null,
        url: url,
        fields,
        birthday: bday ? bday[0] : null,
        location: person["vcard:Address"] || null,
        userHost: host,
        pronouns: person.pronouns || {}
    });
    const publicKey = person.publicKey ? new UserPublickey({
        userId: user.id,
        keyId: person.publicKey.id,
        keyPem: person.publicKey.publicKeyPem
    }) : null;
    try {
        // Save the objects atomically using a db transaction, note that we should never run any code in a transaction block directly
        await db.transaction(async (transactionalEntityManager)=>{
            await transactionalEntityManager.save(user);
            await transactionalEntityManager.save(profile);
            if (publicKey) await transactionalEntityManager.save(publicKey);
        });
    } catch (e) {
        // duplicate key error
        if (isDuplicateKeyValueError(e)) {
            // /users/@a => /users/:id Corresponds to an error that may occur when the input is an alias like
            const u = await Users.findOneBy({
                uri: person.id
            });
            if (u) {
                user = u;
            } else {
                throw new Error("already registered");
            }
        } else {
            logger.error(e instanceof Error ? e : new Error(e));
            throw e;
        }
    }
    // Register host
    registerOrFetchInstanceDoc(host).then((i)=>{
        Instances.increment({
            id: i.id
        }, "usersCount", 1);
        instanceChart.newUser(i.host);
        fetchInstanceMetadata(i);
    });
    usersChart.update(user, true);
    // Hashtag update
    updateUsertags(user, tags);
    // Mentions update, then prewarm html cache
    if (await limiter.shouldContinue()) UserProfiles.updateMentions(user.id, limiter).then((_)=>UserConverter.prewarmCacheById(user.id));
    //#region Fetch avatar and header image
    const [avatar, banner] = await Promise.all([
        person.icon,
        person.image
    ].map((img)=>img == null ? Promise.resolve(null) : resolveImage(user, img).catch(()=>null)));
    const avatarId = avatar?.id ?? null;
    const avatarBlurhash = avatar?.blurhash ?? null;
    const avatarUrl = avatar ? DriveFiles.getDatabasePrefetchUrl(avatar, true) : null;
    const bannerId = banner?.id ?? null;
    const bannerBlurhash = banner?.blurhash ?? null;
    const bannerUrl = banner ? DriveFiles.getDatabasePrefetchUrl(banner, false) : null;
    await Users.update(user.id, {
        avatarId,
        avatarBlurhash,
        avatarUrl,
        bannerId,
        bannerBlurhash,
        bannerUrl
    });
    user.avatarId = avatarId;
    user.avatarBlurhash = avatarBlurhash;
    user.avatarUrl = avatarUrl;
    user.bannerId = bannerId;
    user.bannerBlurhash = bannerBlurhash;
    user.bannerUrl = bannerUrl;
    //#endregion
    //#region Get custom emoji
    const emojis = await extractEmojis(person.tag || [], host).catch((e)=>{
        logger.info(`extractEmojis: ${e}`);
        return [];
    });
    const emojiNames = emojis.map((emoji)=>emoji.name);
    await Users.update(user.id, {
        emojis: emojiNames
    });
    //#endregion
    await updateFeatured(user.id, resolver, limiter).catch((err)=>logger.error(err));
    return user;
}
/**
 * Update Person data from remote.
 * If the target Person is not registered in Iceshrimp, it is ignored.
 * @param uri URI of Person
 * @param resolver Resolver
 * @param hint Hint of Person object (If this value is a valid Person, it is used for updating without Remote resolve)
 * @param userHint Hint of IRemoteUser object, used for updating user information for remotes that only support webfinger with acct: query
 */ export async function updatePerson(uri, resolver, hint, userHint) {
    if (typeof uri !== "string") throw new Error("uri is not string");
    // Skip if the URI points to this server
    if (extractDbHost(uri) === toPuny(config.host)) {
        return;
    }
    //#region Already registered on this server?
    const user = await Users.findOneBy({
        uri
    });
    if (user == null) {
        return;
    }
    //#endregion
    if (resolver == null) resolver = new Resolver();
    const object = hint || await resolver.resolve(uri);
    const person = validateActor(object, uri);
    logger.info(`Updating the Person: ${person.id}`);
    const host = await getSubjectHostFromUri(uri) ?? await getSubjectHostFromRemoteUser(userHint);
    // Fetch avatar and header image
    const [avatar, banner] = await Promise.all([
        person.icon,
        person.image
    ].map((img)=>img == null ? Promise.resolve(null) : resolveImage(user, img).catch(()=>null)));
    // Custom pictogram acquisition
    const emojis = await extractEmojis(person.tag || [], user.host).catch((e)=>{
        logger.info(`extractEmojis: ${e}`);
        return [];
    });
    const emojiNames = emojis.map((emoji)=>emoji.name);
    const { fields } = await analyzeAttachments(person.attachment || []);
    const tags = extractApHashtags(person.tag).map((tag)=>normalizeForSearch(tag)).splice(0, 32);
    const bday = person["vcard:bday"]?.match(/^\d{4}-\d{2}-\d{2}/);
    const url = getOneApHrefNullable(person.url);
    if (url && !url.startsWith("https://")) {
        throw new Error(`unexpected schema of person url: ${url}`);
    }
    let followersCount;
    if (typeof person.followers === "string") {
        try {
            let data = await fetch(person.followers, {
                headers: {
                    Accept: "application/json"
                },
                size: 1024 * 1024
            });
            let json_data = JSON.parse(await data.text());
            followersCount = json_data.totalItems;
        } catch  {
            followersCount = undefined;
        }
    }
    let followingCount;
    if (typeof person.following === "string") {
        try {
            let data = await fetch(person.following, {
                headers: {
                    Accept: "application/json"
                },
                size: 1024 * 1024
            });
            let json_data = JSON.parse(await data.text());
            followingCount = json_data.totalItems;
        } catch  {
            followingCount = undefined;
        }
    }
    let canBite = "nobody";
    if (person.canBite) {
        if (person.canBite === "https://www.w3.org/ns/activitystreams#Public") {
            canBite = "anyone";
        } else if (person.followers && person.canBite === getApId(person.followers)) {
            canBite = "followers";
        }
    }
    const updates = {
        lastFetchedAt: new Date(),
        inbox: person.inbox,
        sharedInbox: person.sharedInbox || (person.endpoints ? person.endpoints.sharedInbox : undefined),
        followersUri: person.followers ? getApId(person.followers) : undefined,
        followersCount: followersCount !== undefined ? followersCount : person.followers && typeof person.followers !== "string" && isCollectionOrOrderedCollection(person.followers) ? person.followers.totalItems : undefined,
        followingCount: followingCount !== undefined ? followingCount : person.following && typeof person.following !== "string" && isCollectionOrOrderedCollection(person.following) ? person.following.totalItems : undefined,
        featured: person.featured,
        emojis: emojiNames,
        name: truncate(person.name, nameLength),
        tags,
        isBot: getApType(object) === "Service",
        isCat: person.isCat === true,
        isLocked: !!person.manuallyApprovesFollowers,
        movedToUri: person.movedTo || null,
        alsoKnownAs: person.alsoKnownAs || null,
        isExplorable: !!person.discoverable,
        canBite
    };
    if (avatar) {
        updates.avatarId = avatar.id;
        updates.avatarUrl = DriveFiles.getDatabasePrefetchUrl(avatar, true);
        updates.avatarBlurhash = avatar.blurhash;
    }
    if (banner) {
        updates.bannerId = banner.id;
        updates.bannerUrl = DriveFiles.getDatabasePrefetchUrl(banner, false);
        updates.bannerBlurhash = banner.blurhash;
    }
    if (host) {
        updates.host = host;
    }
    // Update user
    await Users.update(user.id, updates);
    if (person.publicKey) {
        await UserPublickeys.update({
            userId: user.id
        }, {
            keyId: person.publicKey.id,
            keyPem: person.publicKey.publicKeyPem
        });
    }
    // Get old profile to see if we need to update any matching html cache entries
    const oldProfile = await UserProfiles.findOneBy({
        userId: user.id
    });
    const newProfile = {
        url: url,
        fields,
        description: person._misskey_summary ? truncate(person._misskey_summary, summaryLength) : person.summary ? await htmlToMfm(truncate(person.summary, summaryLength), person.tag) : null,
        birthday: bday ? bday[0] : null,
        location: person["vcard:Address"] || null,
        pronouns: person.pronouns || {}
    };
    await UserProfiles.update({
        userId: user.id
    }, newProfile);
    publishInternalEvent("remoteUserUpdated", {
        id: user.id
    });
    // Hashtag Update
    updateUsertags(user, tags);
    // Mentions update, then prewarm html cache
    UserProfiles.updateMentions(user.id).then((_)=>UserConverter.prewarmCacheById(user.id, oldProfile));
    // If the user in question is a follower, followers will also be updated.
    await Followings.update({
        followerId: user.id
    }, {
        followerSharedInbox: person.sharedInbox || (person.endpoints ? person.endpoints.sharedInbox : null)
    });
    await updateFeatured(user.id, resolver).catch((err)=>logger.error(err));
}
/**
 * Resolve Person.
 *
 * If the target person is registered in Iceshrimp, it returns it;
 * otherwise, it fetches it from the remote server, registers it in Iceshrimp, and returns it.
 */ export async function resolvePerson(uri, resolver, limiter = new RecursionLimiter()) {
    if (typeof uri !== "string") throw new Error("uri is not string");
    //#region If already registered on this server, return it.
    const user = await fetchPerson(uri);
    if (user != null) {
        return user;
    }
    //#endregion
    // Fetched from remote server and registered
    if (resolver == null) resolver = new Resolver();
    return await createPerson(uri, resolver, undefined, limiter);
}
const services = {
    "misskey:authentication:github": (id, login)=>({
            id,
            login
        }),
    "misskey:authentication:discord": (id, name)=>$discord(id, name)
};
const $discord = (id, name)=>{
    if (typeof name !== "string") {
        name = "unknown#0000";
    }
    const [username, discriminator] = name.split("#");
    return {
        id,
        username,
        discriminator
    };
};
function addService(target, source) {
    const service = services[source.name];
    if (typeof source.value !== "string") {
        source.value = "unknown";
    }
    const [id, username] = source.value.split("@");
    if (service) {
        target[source.name.split(":")[2]] = service(id, username);
    }
}
export async function analyzeAttachments(attachments) {
    const fields = [];
    const services = {};
    if (Array.isArray(attachments)) {
        for (const attachment of attachments.filter(isPropertyValue)){
            if (isPropertyValue(attachment.identifier)) {
                addService(services, attachment.identifier);
            } else {
                fields.push({
                    name: attachment.name,
                    value: await fromHtml(attachment.value)
                });
            }
        }
    }
    return {
        fields,
        services
    };
}
export async function updateFeatured(userId, resolver, limiter = new RecursionLimiter()) {
    const user = await Users.findOneByOrFail({
        id: userId
    });
    if (!Users.isRemoteUser(user)) return;
    if (!user.featured) return;
    logger.info(`Updating the featured: ${user.uri}`);
    if (resolver == null) resolver = new Resolver();
    // Attempt to get a local user that follows the remote user
    const follower = await Users.getRandomFollower(userId);
    if (follower) resolver.setUser(follower);
    // Resolve to (Ordered)Collection Object
    const collection = await resolver.resolveCollection(user.featured);
    if (!isCollectionOrOrderedCollection(collection)) throw new Error("Object is not Collection or OrderedCollection");
    // Resolve to Object(may be Note) arrays
    const unresolvedItems = isCollection(collection) ? collection.items : collection.orderedItems;
    const items = await Promise.all(toArray(unresolvedItems).map((x)=>resolver.resolve(x)));
    // Resolve and register Notes
    resolver.reset();
    const limit = promiseLimit(2);
    const featuredNotes = await Promise.all(items.filter((item)=>getApType(item) === "Note") // TODO: Maybe it doesn't have to be a Note.
    .slice(0, 5).map((item)=>limit(()=>resolveNote(item, resolver, limiter))));
    // Prepare the objects
    // For now, generate the id at a different time and maintain the order.
    const data = [];
    let td = 0;
    for (const note of featuredNotes.filter((note)=>note != null)){
        td -= 1000;
        data.push({
            id: genId(new Date(Date.now() + td)),
            createdAt: new Date(),
            userId: user.id,
            noteId: note.id
        });
    }
    // Save the objects atomically using a db transaction, note that we should never run any code in a transaction block directly
    await db.transaction(async (transactionalEntityManager)=>{
        await transactionalEntityManager.delete(UserNotePining, {
            userId: user.id
        });
        await transactionalEntityManager.insert(UserNotePining, data);
    });
}
