import create from "@/services/following/create.js";
import define from "../../define.js";
import { ApiError } from "../../error.js";
import { getUser } from "../../common/getters.js";
import { Followings, Users } from "@/models/index.js";
import { IdentifiableError } from "@/misc/identifiable-error.js";
import { HOUR } from "@/const.js";

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

	limit: {
		duration: HOUR,
		max: 100,
	},

	requireCredential: true,

	kind: "write:following",

	errors: {
		noSuchUser: {
			message: "No such user.",
			code: "NO_SUCH_USER",
			id: "fcd2eef9-a9b2-4c4f-8624-038099e90aa5",
		},

		followeeIsYourself: {
			message: "Followee is yourself.",
			code: "FOLLOWEE_IS_YOURSELF",
			id: "26fbe7bb-a331-4857-af17-205b426669a9",
		},

		alreadyFollowing: {
			message: "You are already following that user.",
			code: "ALREADY_FOLLOWING",
			id: "35387507-38c7-4cb9-9197-300b93783fa0",
		},

		blocking: {
			message: "You are blocking that user.",
			code: "BLOCKING",
			id: "4e2206ec-aa4f-4960-b865-6c23ac38e2d9",
		},

		blocked: {
			message: "You are blocked by that user.",
			code: "BLOCKED",
			id: "c4ab57cc-4e41-45e9-bfd9-584f61e35ce0",
		},
	},

	res: {
		type: "object",
		optional: false,
		nullable: false,
		ref: "UserLite",
	},
} as const;

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


export default define(meta, paramDef, async (ps, user) => {
	const follower = user;

	// 自分自身
	if (user.id === ps.userId) {
		throw new ApiError(meta.errors.followeeIsYourself);
	}

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

	// Check if already following
	const exist = await Followings.findOneBy({
		followerId: follower.id,
		followeeId: followee.id,
	});

	if (exist != null) {
		throw new ApiError(meta.errors.alreadyFollowing);
	}

	try {
		await create(follower, followee);
	} catch (e) {
		if (e instanceof IdentifiableError) {
			if (e.id === "710e8fb0-b8c3-4922-be49-d5d93d8e6a6e")
				throw new ApiError(meta.errors.blocking);
			if (e.id === "3338392a-f764-498d-8855-db939dcf8c48")
				throw new ApiError(meta.errors.blocked);
		}
		throw e;
	}

	return await Users.pack(followee.id, user);
});