import { publishMainStream } from "@/services/stream.js";
import { renderActivity } from "@/remote/activitypub/renderer/index.js";
import renderFollow from "@/remote/activitypub/renderer/follow.js";
import { deliver } from "@/queue/index.js";
import type { User } from "@/models/entities/user.js";
import { Blockings, FollowRequests, Users } from "@/models/index.js";
import { genId } from "@/misc/gen-id.js";
import { createNotification } from "../../create-notification.js";
import config from "@/config/index.js";

export default async function (
	follower: {
		id: User["id"];
		host: User["host"];
		uri: User["host"];
		inbox: User["inbox"];
		sharedInbox: User["sharedInbox"];
	},
	followee: {
		id: User["id"];
		host: User["host"];
		uri: User["host"];
		inbox: User["inbox"];
		sharedInbox: User["sharedInbox"];
	},
	requestId?: string,
) {
	if (follower.id === followee.id) return;

	// check blocking
	const [blocking, blocked] = await Promise.all([
		Blockings.findOneBy({
			blockerId: follower.id,
			blockeeId: followee.id,
		}),
		Blockings.findOneBy({
			blockerId: followee.id,
			blockeeId: follower.id,
		}),
	]);

	if (blocking) throw new Error("blocking");
	if (blocked) throw new Error("blocked");

	const followRequest = await FollowRequests.insert({
		id: genId(),
		createdAt: new Date(),
		followerId: follower.id,
		followeeId: followee.id,
		requestId,

		// 非正規化
		followerHost: follower.host,
		followerInbox: Users.isRemoteUser(follower) ? follower.inbox : undefined,
		followerSharedInbox: Users.isRemoteUser(follower)
			? follower.sharedInbox
			: undefined,
		followeeHost: followee.host,
		followeeInbox: Users.isRemoteUser(followee) ? followee.inbox : undefined,
		followeeSharedInbox: Users.isRemoteUser(followee)
			? followee.sharedInbox
			: undefined,
	}).then((x) => FollowRequests.findOneByOrFail(x.identifiers[0]));

	// Publish receiveRequest event
	if (Users.isLocalUser(followee)) {
		Users.pack(follower.id, followee).then((packed) =>
			publishMainStream(followee.id, "receiveFollowRequest", packed),
		);

		Users.pack(followee.id, followee, {
			detail: true,
		}).then((packed) => publishMainStream(followee.id, "meUpdated", packed));

		// 通知を作成
		createNotification(followee.id, "receiveFollowRequest", {
			notifierId: follower.id,
			followRequestId: followRequest.id,
		});
	}

	if (Users.isLocalUser(follower) && Users.isRemoteUser(followee)) {
		const content = renderActivity(renderFollow(follower, followee, requestId ?? `${config.url}/follows/${followRequest.id}`));
		deliver(follower, content, followee.inbox);
	}
}