import {
	UserGroups,
	UserGroupJoinings,
	UserGroupInvitations,
} from "@/models/index.js";
import { genId } from "@/misc/gen-id.js";
import type { UserGroupInvitation } from "@/models/entities/user-group-invitation.js";
import { createNotification } from "@/services/create-notification.js";
import { getUser } from "../../../common/getters.js";
import { ApiError } from "../../../error.js";
import define from "../../../define.js";

export const meta = {
	tags: ["groups", "users"],

	requireCredential: true,

	kind: "write:user-groups",

	description: "Invite a user to an existing group.",

	errors: {
		noSuchGroup: {
			message: "No such group.",
			code: "NO_SUCH_GROUP",
			id: "583f8bc0-8eee-4b78-9299-1e14fc91e409",
		},

		noSuchUser: {
			message: "No such user.",
			code: "NO_SUCH_USER",
			id: "da52de61-002c-475b-90e1-ba64f9cf13a8",
		},

		alreadyAdded: {
			message: "That user has already been added to that group.",
			code: "ALREADY_ADDED",
			id: "7e35c6a0-39b2-4488-aea6-6ee20bd5da2c",
		},

		alreadyInvited: {
			message: "That user has already been invited to that group.",
			code: "ALREADY_INVITED",
			id: "ee0f58b4-b529-4d13-b761-b9a3e69f97e6",
		},
	},
} as const;

export const paramDef = {
	type: "object",
	properties: {
		groupId: { type: "string", format: "misskey:id" },
		userId: { type: "string", format: "misskey:id" },
	},
	required: ["groupId", "userId"],
} as const;

export default define(meta, paramDef, async (ps, me) => {
	// Fetch the group
	const userGroup = await UserGroups.findOneBy({
		id: ps.groupId,
		userId: me.id,
	});

	if (userGroup == null) {
		throw new ApiError(meta.errors.noSuchGroup);
	}

	// Fetch the user
	const user = await getUser(ps.userId).catch((e) => {
		if (e.id === "15348ddd-432d-49c2-8a5a-8069753becff")
			throw new ApiError(meta.errors.noSuchUser);
		throw e;
	});

	const joining = await UserGroupJoinings.findOneBy({
		userGroupId: userGroup.id,
		userId: user.id,
	});

	if (joining) {
		throw new ApiError(meta.errors.alreadyAdded);
	}

	const existInvitation = await UserGroupInvitations.findOneBy({
		userGroupId: userGroup.id,
		userId: user.id,
	});

	if (existInvitation) {
		throw new ApiError(meta.errors.alreadyInvited);
	}

	const invitation = await UserGroupInvitations.insert({
		id: genId(),
		createdAt: new Date(),
		userId: user.id,
		userGroupId: userGroup.id,
	} as UserGroupInvitation).then((x) =>
		UserGroupInvitations.findOneByOrFail(x.identifiers[0]),
	);

	// 通知を作成
	createNotification(user.id, "groupInvited", {
		notifierId: me.id,
		userGroupInvitationId: invitation.id,
	});
});
