import client from "./db-client.js";
import prompt from "prompt-sync";

const promptSync = prompt();

try {
	await client.connect();

	const id = Number(promptSync("Enter the ID of the department you want to update: "));
	const newName = promptSync("Enter the new name of the department: ").trim();

	if (!Number.isInteger(id) || id <= 0) {
		throw new Error("Department ID must be a positive integer.");
	}

	if (!newName) {
		throw new Error("Department name cannot be empty.");
	}

	// RETURNING avoids a separate query for checking whether the department exists.
	const result = await client.query(
		`UPDATE department
		 SET name = $1
		 WHERE id = $2
		 RETURNING id, name`,
		[newName, id],
	);

	if (result.rows.length === 0) {
		throw new Error(`Department with ID ${id} not found.`);
	}

	console.log("Updated department:");
	console.table(result.rows[0]);
} catch (error) {
	console.error(error.message);
	process.exitCode = 1;
} finally {
	await client.end();
}