import type { User } from '@/models/entities/user.js';
import { resolveUser } from '@/remote/resolve-user.js';
import { DAY } from '@/const.js';
import DeliverManager from '@/remote/activitypub/deliver-manager.js';
import { renderActivity } from '@/remote/activitypub/renderer/index.js';
import { genId } from '@/misc/gen-id.js';
import define from '../../define.js';
import { ApiError } from '../../error.js';
import { apiLogger } from '../../logger.js';
import deleteFollowing from '@/services/following/delete.js';
import create from '@/services/following/create.js';
import { getUser } from '@/server/api/common/getters.js';
import { Followings, Users } from '@/models/index.js';
import { UserProfiles } from '@/models/index.js';
import config from '@/config/index.js';
import { publishMainStream } from '@/services/stream.js';

export const meta = {
	tags: ['users'],

	secure: true,
	requireCredential: true,

	limit: {
		duration: DAY,
		max: 5,
	},

	errors: {
		noSuchMoveTarget: {
			message: 'No such move target.',
			code: 'NO_SUCH_MOVE_TARGET',
			id: 'b5c90186-4ab0-49c8-9bba-a1f76c202ba4',
		},
		remoteAccountForbids: {
			message: 'Remote account doesn\'t have proper \'Known As\' alias. Did you remember to set it?',
			code: 'REMOTE_ACCOUNT_FORBIDS',
			id: 'b5c90186-4ab0-49c8-9bba-a1f766282ba4',
		},
		notRemote: {
			message: 'User is not remote. You can only migrate to other instances.',
			code: 'NOT_REMOTE',
			id: '4362f8dc-731f-4ad8-a694-be2a88922a24',
		},
		adminForbidden: {
			message: 'Admins cant migrate.',
			code: 'NOT_ADMIN_FORBIDDEN',
			id: '4362e8dc-731f-4ad8-a694-be2a88922a24',
		},
		noSuchUser: {
			message: 'No such user.',
			code: 'NO_SUCH_USER',
			id: 'fcd2eef9-a9b2-4c4f-8624-038099e90aa5',
		},
		uriNull: {
			message: "User ActivityPup URI is null.",
			code: "URI_NULL",
			id: "bf326f31-d430-4f97-9933-5d61e4d48a23",
		},
		localUriNull: {
			message: "Local User ActivityPup URI is null.",
			code: "URI_NULL",
			id: "95ba11b9-90e8-43a5-ba16-7acc1ab32e71",
		},
		alreadyMoved: {
			message: "Account was already moved to another account.",
			code: "ALREADY_MOVED",
			id: "b234a14e-9ebe-4581-8000-074b3c215962",
		},
	},
} as const;

export const paramDef = {
	type: 'object',
	properties: {
		moveToAccount: { type: 'string' },
	},
	required: ['moveToAccount'],
} as const;

function moveActivity(toUrl: string, fromUrl: string) {
	const activity = {
		id: genId(),
		actor: fromUrl,
		type: 'Move',
		object: fromUrl,
		target: toUrl,
	} as any;

	return renderActivity(activity);
}

// eslint-disable-next-line import/no-default-export
export default define(meta, paramDef, async (ps, user) => {
	if (!ps.moveToAccount) throw new ApiError(meta.errors.noSuchMoveTarget);
	if (user.isAdmin) throw new ApiError(meta.errors.adminForbidden);
	if (user.movedToUri) throw new ApiError(meta.errors.alreadyMoved);

	let unfiltered: string = ps.moveToAccount;
	if (!unfiltered) {
		throw new ApiError(meta.errors.noSuchMoveTarget);
	}

	if (unfiltered.startsWith('acct:')) unfiltered = unfiltered.substring(5);
	if (unfiltered.startsWith('@')) unfiltered = unfiltered.substring(1);
	if (!unfiltered.includes('@')) throw new ApiError(meta.errors.notRemote);

	const userAddress: string[] = unfiltered.split('@');
	const moveTo: User = await resolveUser(userAddress[0], userAddress[1]).catch(e => {
		apiLogger.warn(`failed to resolve remote user: ${e}`);
		throw new ApiError(meta.errors.noSuchMoveTarget);
	});
	let fromUrl: string | null = user.uri;
	if(!fromUrl) {
		fromUrl = `${config.url}/users/${user.id}`;
	}

	let toUrl: string | null = moveTo.uri;
	if(!toUrl) {
		throw new ApiError(meta.errors.uriNull);
	}

	let allowed = false;

	moveTo.alsoKnownAs?.forEach(element => {
		if (fromUrl!.includes(element)) allowed = true;
	});

	if (!allowed || !toUrl || !fromUrl) throw new ApiError(meta.errors.remoteAccountForbids);

	const updates = {} as Partial<User>;

	if (!toUrl) toUrl = '';
	updates.movedToUri = toUrl;

	await Users.update(user.id, updates);
	const iObj = await Users.pack<true, true>(user.id, user, {
		detail: true,
		includeSecrets: true,
	});

	const moveAct = moveActivity(toUrl, fromUrl);
	const dm = new DeliverManager(user, moveAct);
	dm.addFollowersRecipe();
	dm.execute();

	// Publish meUpdated event
	publishMainStream(user.id, 'meUpdated', iObj);

	const followings = await Followings.findBy({
		followeeId: user.id,
	});

	followings.forEach(async following => {
		//if follower is local
		if (!following.followerHost) {
			const follower = await getUser(following.followerId).catch(e => {
				if (e.id === '15348ddd-432d-49c2-8a5a-8069753becff') throw new ApiError(meta.errors.noSuchUser);
				throw e;
			});
			await deleteFollowing(follower!, user);
			try {
				await create(follower!, moveTo);
			} catch (e) { /* empty */ }
		}
	});

	return iObj;
});