import * as fs from "node:fs";

import { queueLogger } from "../../logger.js";
import { addFile } from "@/services/drive/add-file.js";
import { format as dateFormat } from "date-fns";
import { getFullApAccount } from "@/misc/convert-host.js";
import { createTemp } from "@/misc/create-temp.js";
import { Users, UserLists, UserListJoinings } from "@/models/index.js";
import { In } from "typeorm";
import type { DbUserJobData } from "@/queue/types.js";
import { Job } from "bullmq";

const logger = queueLogger.createSubLogger("export-user-lists");

export async function exportUserLists(
	job: Job<DbUserJobData>,
): Promise<string> {
	logger.info(`Exporting user lists of ${job.data.user.id} ...`);

	const user = await Users.findOneBy({ id: job.data.user.id });
	if (user == null) {
		return "skip: User not found";
	}

	const lists = await UserLists.findBy({
		userId: user.id,
	});

	// Create temp file
	const [path, cleanup] = await createTemp();

	logger.info(`Temp file is ${path}`);

	try {
		const stream = fs.createWriteStream(path, { flags: "a" });

		for (const list of lists) {
			const joinings = await UserListJoinings.findBy({ userListId: list.id });
			const users = await Users.findBy({
				id: In(joinings.map((j) => j.userId)),
			});

			for (const u of users) {
				const acct = getFullApAccount(u.username, u.host);
				const content = `${list.name},${acct}`;
				await new Promise<void>((res, rej) => {
					stream.write(content + "\n", (err) => {
						if (err) {
							logger.error(err);
							rej(err);
						} else {
							res();
						}
					});
				});
			}
		}

		stream.end();
		logger.succ(`Exported to: ${path}`);

		const fileName = `user-lists-${dateFormat(
			new Date(),
			"yyyy-MM-dd-HH-mm-ss",
		)}.csv`;
		const driveFile = await addFile({
			user,
			path,
			name: fileName,
			force: true,
		});

		logger.succ(`Exported to: ${driveFile.id}`);
	} finally {
		cleanup();
	}

	return "Success";
}
