import { cn } from '../../../../lib/cn';
import { useNavigate } from 'react-router-dom';
import { useAppDispatch, useAppSelector } from '../../../../redux/hooks';
import { useQuery } from '../../../../hooks/useQuery';
import { toastWarning } from '../../../../lib/toastNotification';
import { useEffect, useState } from 'react';
import { ReverseButton } from '../../../../components/button/ReverseButton';
import { PrimaryButton } from '../../../../components/button/PrimaryButton';
import {
    addOrUpdateContestMember,
    fetchParticipatingContests,
} from '../../../../redux/slices/contests';

type Role = 'None' | 'Participant' | 'Organizer';

export interface UpcoingContestItemProps {
    name: string;
    contestId: number;
    scheduleType: 'AlwaysOpen' | 'FixedWindow' | 'RollingWindow';
    startsAt: string;
    endsAt: string;
    attemptDurationMinutes: number;
    type: 'first' | 'second';
    groupId: number;
}

function formatDate(dateString: string): string {
    const date = new Date(dateString);

    const day = date.getDate().toString().padStart(2, '0');
    const month = (date.getMonth() + 1).toString().padStart(2, '0');
    const year = date.getFullYear();

    const hours = date.getHours().toString().padStart(2, '0');
    const minutes = date.getMinutes().toString().padStart(2, '0');

    return `${day}/${month}/${year}\n${hours}:${minutes}`;
}

function formatDurationTime(minutes: number): string {
    const hours = Math.floor(minutes / 60);
    const days = Math.floor(hours / 24);

    if (days > 0) {
        const remainder = days % 10;
        let suffix = 'дней';
        if (remainder === 1 && days !== 11) suffix = 'день';
        else if (remainder >= 2 && remainder <= 4 && (days < 10 || days > 20))
            suffix = 'дня';
        return `${days} ${suffix}`;
    } else if (hours > 0) {
        const mins = minutes % 60;
        return mins > 0 ? `${hours} ч ${mins} мин` : `${hours} ч`;
    } else {
        return `${minutes} мин`;
    }
}

function formatWaitTime(ms: number): string {
    const minutes = Math.floor(ms / 60000);
    const hours = Math.floor(minutes / 60);
    const days = Math.floor(hours / 24);

    if (days > 0) {
        const remainder = days % 10;
        let suffix = 'дней';
        if (remainder === 1 && days !== 11) suffix = 'день';
        else if (remainder >= 2 && remainder <= 4 && (days < 10 || days > 20))
            suffix = 'дня';
        return `${days} ${suffix}`;
    } else if (hours > 0) {
        const mins = minutes % 60;
        return mins > 0 ? `${hours} ч ${mins} мин` : `${hours} ч`;
    } else {
        return `${minutes} мин`;
    }
}

const UpcoingContestItem: React.FC<UpcoingContestItemProps> = ({
    name,
    contestId,
    scheduleType,
    startsAt,
    endsAt,
    attemptDurationMinutes,
    type,
    groupId,
}) => {
    const navigate = useNavigate();
    const dispatch = useAppDispatch();

    const [role, setRole] = useState<Role>('None');

    const myname = useAppSelector((state) => state.auth.username);

    const { contests: myContests } = useAppSelector(
        (state) => state.contests.fetchMyContests,
    );
    const { contests: participantContests } = useAppSelector(
        (state) => state.contests.fetchParticipating,
    );

    const query = useQuery();
    const username = query.get('username') ?? myname ?? '';

    const userId = useAppSelector((state) => state.auth.id);

    const started = new Date(startsAt) <= new Date();
    const finished = new Date(endsAt) <= new Date();
    const waitTime = !started
        ? new Date(startsAt).getTime() - new Date().getTime()
        : new Date(endsAt).getTime() - new Date().getTime();

    useEffect(() => {
        setRole(
            (() => {
                if (myContests?.some((c) => c.id === contestId)) {
                    return 'Organizer';
                }
                if (participantContests?.some((c) => c.id === contestId)) {
                    return 'Participant';
                }
                return 'None';
            })(),
        );
    }, [myContests, participantContests]);

    return (
        <div
            className={cn(
                'w-full box-border relative rounded-[10px] px-[20px] py-[14px] text-liquid-white  text-[16px] leading-[20px] cursor-pointer  items-center font-bold border-transparent hover:border-liquid-darkmain border-solid border-[1px] transition-all duration-300 grid grid-flow-col',
                userId
                    ? 'grid-cols-[1fr,1fr,190px,130px,130px,150px]'
                    : 'grid-cols-[1fr,1fr,190px,130px,130px]',

                type == 'first'
                    ? ' bg-liquid-lighter'
                    : ' bg-liquid-background',
            )}
            onClick={() => {
                if (!started) {
                    toastWarning('Контест еще не начался');
                    return;
                }

                const params = new URLSearchParams({
                    back: `/group/${groupId}/contests`,
                });
                navigate(`/contest/${contestId}?${params}`);
            }}
        >
            <div className="text-left font-bold text-[18px]">{name}</div>
            <div className="text-center text-liquid-brightmain font-normal  flex items-center justify-center">
                {username}
            </div>
            {scheduleType == 'AlwaysOpen' ? (
                <div className="text-center  text-nowrap whitespace-pre-line text-[14px]">
                    Всегда открыт
                </div>
            ) : (
                <div className="flex items-center gap-[5px] text-[14px]">
                    <div className="text-center  text-nowrap whitespace-pre-line">
                        {formatDate(startsAt)}
                    </div>
                    <div>-</div>
                    <div className="text-center  text-nowrap whitespace-pre-line">
                        {formatDate(endsAt)}
                    </div>
                </div>
            )}

            <div className="text-center">
                {formatDurationTime(attemptDurationMinutes)}
            </div>

            {!started ? (
                <div className="text-center whitespace-pre-line ">
                    {'До начала\n' + formatWaitTime(waitTime)}
                </div>
            ) : (
                !finished && (
                    <div className="text-center whitespace-pre-line ">
                        {'До конца\n' + formatWaitTime(waitTime)}
                    </div>
                )
            )}

            {userId && (
                <div className="flex items-center justify-center">
                    {role == 'Organizer' || role == 'Participant' ? (
                        <ReverseButton
                            onClick={() => {
                                const params = new URLSearchParams({
                                    back: `/group/${groupId}/contests`,
                                });
                                navigate(`/contest/${contestId}?${params}`);
                            }}
                            text="Войти"
                        />
                    ) : (
                        <PrimaryButton
                            onClick={() => {
                                dispatch(
                                    addOrUpdateContestMember({
                                        contestId: contestId,
                                        member: {
                                            userId: Number(userId),
                                            role: 'Participant',
                                        },
                                    }),
                                )
                                    .unwrap()
                                    .then(() =>
                                        dispatch(
                                            fetchParticipatingContests({}),
                                        ),
                                    );
                            }}
                            text="Регистрация"
                        />
                    )}
                </div>
            )}
        </div>
    );
};

export default UpcoingContestItem;