import type { KVs } from "../core.js";
import Chart from "../core.js";
import { Followings, Users } from "@/models/index.js";
import { Not, IsNull } from "typeorm";
import type { User } from "@/models/entities/user.js";
import { name, schema } from "./entities/per-user-following.js";

/**
 * ユーザーごとのフォローに関するチャート
 */

export default class PerUserFollowingChart extends Chart<typeof schema> {
	constructor() {
		super(name, schema, true);
	}

	protected async tickMajor(
		group: string,
	): Promise<Partial<KVs<typeof schema>>> {
		const [
			localFollowingsCount,
			localFollowersCount,
			remoteFollowingsCount,
			remoteFollowersCount,
		] = await Promise.all([
			Followings.countBy({ followerId: group, followeeHost: IsNull() }),
			Followings.countBy({ followeeId: group, followerHost: IsNull() }),
			Followings.countBy({ followerId: group, followeeHost: Not(IsNull()) }),
			Followings.countBy({ followeeId: group, followerHost: Not(IsNull()) }),
		]);

		return {
			"local.followings.total": localFollowingsCount,
			"local.followers.total": localFollowersCount,
			"remote.followings.total": remoteFollowingsCount,
			"remote.followers.total": remoteFollowersCount,
		};
	}

	protected async tickMinor(): Promise<Partial<KVs<typeof schema>>> {
		return {};
	}

	public async update(
		follower: { id: User["id"]; host: User["host"] },
		followee: { id: User["id"]; host: User["host"] },
		isFollow: boolean,
	): Promise<void> {
		const prefixFollower = Users.isLocalUser(follower) ? "local" : "remote";
		const prefixFollowee = Users.isLocalUser(followee) ? "local" : "remote";

		this.commit(
			{
				[`${prefixFollower}.followings.total`]: isFollow ? 1 : -1,
				[`${prefixFollower}.followings.inc`]: isFollow ? 1 : 0,
				[`${prefixFollower}.followings.dec`]: isFollow ? 0 : 1,
			},
			follower.id,
		);
		this.commit(
			{
				[`${prefixFollowee}.followers.total`]: isFollow ? 1 : -1,
				[`${prefixFollowee}.followers.inc`]: isFollow ? 1 : 0,
				[`${prefixFollowee}.followers.dec`]: isFollow ? 0 : 1,
			},
			followee.id,
		);
	}
}