import Button from "@/components/Low/Button";
import {Type} from "@/interfaces/user";
import axios from "axios";
import clsx from "clsx";
import {capitalize} from "lodash";
import {useEffect, useState} from "react";
import {toast} from "react-toastify";
import ShortUniqueId from "short-unique-id";
import {useFilePicker} from "use-file-picker";

export default function BatchCodeGenerator() {
	const [emails, setEmails] = useState<string[]>([]);
	const [isLoading, setIsLoading] = useState(false);
	const {openFilePicker, filesContent} = useFilePicker({
		accept: ".txt",
		multiple: false,
	});

	useEffect(() => {
		if (filesContent.length > 0) {
			const file = filesContent[0];
			const emails = file.content
				.split("\n")
				.filter((x) => new RegExp(/^[a-zA-Z0-9]+(?:\.[a-zA-Z0-9]+)*@[a-zA-Z0-9]+(?:\.[a-zA-Z0-9]+)*$/).test(x));

			if (emails.length === 0) {
				toast.error("Please upload a .txt file containing e-mails, one per line!");
				return;
			}

			setEmails(emails);
		}
	}, [filesContent]);

	const generateCode = (type: Type) => {
		const uid = new ShortUniqueId();
		const codes = emails.map(() => uid.randomUUID(6));

		setIsLoading(true);
		axios
			.post("/api/code", {type, codes, emails})
			.then(({data, status}) => {
				if (data.ok) {
					toast.success(`Successfully generated ${capitalize(type)} codes and they have been notified by e-mail!`, {toastId: "success"});
					return;
				}

				if (status === 403) {
					toast.error(`You do not have permission to generate ${capitalize(type)} codes!`, {toastId: "forbidden"});
				}
			})
			.catch(({response: {status}}) => {
				if (status === 403) {
					toast.error(`You do not have permission to generate ${capitalize(type)} codes!`, {toastId: "forbidden"});
					return;
				}

				toast.error(`Something went wrong, please try again later!`, {toastId: "error"});
			})
			.finally(() => setIsLoading(false));
	};

	return (
		<div className="flex flex-col gap-4 border p-4 border-mti-gray-platinum rounded-xl">
			<label className="font-normal text-base text-mti-gray-dim">Choose a .txt file containing e-mails</label>
			<Button onClick={openFilePicker} isLoading={isLoading} disabled={isLoading}>
				{filesContent.length > 0 ? filesContent[0].name : "Choose a file"}
			</Button>
			<label className="font-normal text-base text-mti-gray-dim">Select the type of user they should be</label>
			<div className="grid grid-cols-2 gap-4">
				<Button className="w-48" variant="outline" onClick={() => generateCode("student")} disabled={emails.length === 0 || isLoading}>
					Student
				</Button>
				<Button className="w-48" variant="outline" onClick={() => generateCode("teacher")} disabled={emails.length === 0 || isLoading}>
					Teacher
				</Button>
				<Button className="w-48" variant="outline" onClick={() => generateCode("admin")} disabled={emails.length === 0 || isLoading}>
					Admin
				</Button>
				<Button className="w-48" variant="outline" onClick={() => generateCode("owner")} disabled={emails.length === 0 || isLoading}>
					Owner
				</Button>
			</div>
		</div>
	);
}
