import Button from "@/components/Low/Button";
import Checkbox from "@/components/Low/Checkbox";
import {PERMISSIONS} from "@/constants/userPermissions";
import useUsers from "@/hooks/useUsers";
import {Type, User} from "@/interfaces/user";
import {USER_TYPE_LABELS} from "@/resources/user";
import axios from "axios";
import clsx from "clsx";
import {capitalize} from "lodash";
import moment from "moment";
import {useEffect, useState} from "react";
import ReactDatePicker from "react-datepicker";
import {toast} from "react-toastify";
import ShortUniqueId from "short-unique-id";
import {useFilePicker} from "use-file-picker";

export default function BatchCodeGenerator({user}: {user: User}) {
	const [emails, setEmails] = useState<string[]>([]);
	const [isLoading, setIsLoading] = useState(false);
	const [expiryDate, setExpiryDate] = useState<Date | null>(null);
	const [isExpiryDateEnabled, setIsExpiryDateEnabled] = useState(true);
	const [type, setType] = useState<Type>("student");

	const {users} = useUsers();

	const {openFilePicker, filesContent} = useFilePicker({
		accept: ".txt",
		multiple: false,
	});

	useEffect(() => {
		if (user && (user.type === "corporate" || user.type === "teacher")) {
			setExpiryDate(user.subscriptionExpirationDate || null);
		}
	}, [user]);

	useEffect(() => {
		if (!isExpiryDateEnabled) setExpiryDate(null);
	}, [isExpiryDateEnabled]);

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

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

			setEmails([...new Set(emails)]);
		}
		// eslint-disable-next-line react-hooks/exhaustive-deps
	}, [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, expiryDate})
			.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(data.reason, {toastId: "forbidden"});
				}
			})
			.catch(({response: {status, data}}) => {
				if (status === 403) {
					toast.error(data.reason, {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>
			{user && (user.type === "developer" || user.type === "admin") && (
				<>
					<div className="flex -md:flex-row md:flex-col -md:items-center 2xl:flex-row 2xl:items-center justify-between gap-2">
						<label className="font-normal text-base text-mti-gray-dim">Expiry Date</label>
						<Checkbox isChecked={isExpiryDateEnabled} onChange={setIsExpiryDateEnabled}>
							Enabled
						</Checkbox>
					</div>
					{isExpiryDateEnabled && (
						<ReactDatePicker
							className={clsx(
								"p-6 w-full min-h-[70px] flex justify-center text-sm font-normal rounded-full border focus:outline-none cursor-pointer",
								"hover:border-mti-purple tooltip",
								"transition duration-300 ease-in-out",
							)}
							filterDate={(date) => moment(date).isAfter(new Date())}
							dateFormat="dd/MM/yyyy"
							selected={expiryDate}
							onChange={(date) => setExpiryDate(date)}
						/>
					)}
				</>
			)}
			<label className="font-normal text-base text-mti-gray-dim">Select the type of user they should be</label>
			{user && (
				<select
					defaultValue="student"
					onChange={(e) => setType(e.target.value as typeof user.type)}
					className="p-6 w-full min-w-[350px] min-h-[70px] flex justify-center text-sm font-normal rounded-full border focus:outline-none cursor-pointer bg-white">
					{Object.keys(USER_TYPE_LABELS).map((type) => (
						<option key={type} value={type}>
							{USER_TYPE_LABELS[type as keyof typeof USER_TYPE_LABELS]}
						</option>
					))}
				</select>
			)}
			<Button onClick={() => generateCode(type)} disabled={emails.length === 0 || (isExpiryDateEnabled ? !expiryDate : false)}>
				Generate & Send
			</Button>
		</div>
	);
}