import { useParams, Navigate, useNavigate } from 'react-router-dom';
import CodeEditor from '../views/mission/codeeditor/CodeEditor';
import Statement from '../views/mission/statement/Statement';
import { PrimaryButton } from '../components/button/PrimaryButton';
import { useEffect, useRef, useState } from 'react';
import { useAppDispatch, useAppSelector } from '../redux/hooks';
import { fetchMySubmitsByMission, submitMission } from '../redux/slices/submit';
import { fetchMissionById, setMissionsStatus } from '../redux/slices/missions';
import Header from '../views/mission/statement/Header';
import MissionSubmissions from '../views/mission/statement/MissionSubmissions';
import { useQuery } from '../hooks/useQuery';
import { fetchMyAttemptsInContest } from '../redux/slices/contests';

const Mission = () => {
    const dispatch = useAppDispatch();
    const navigate = useNavigate();

    // Получаем параметры из URL
    const { missionId } = useParams<{ missionId: string }>();
    const mission = useAppSelector((state) => state.missions.currentMission);
    const missionStatus = useAppSelector(
        (state) => state.missions.statuses.fetchById,
    );
    const attempt = useAppSelector(
        (state) => state.contests.fetchMyAttemptsInContest.attempts[0],
    );

    const missionIdNumber = Number(missionId);

    const query = useQuery();
    const back = query.get('back') ?? undefined;
    const contestId = Number(query.get('contestId') ?? undefined);

    if (!missionId || isNaN(missionIdNumber)) {
        if (back) return <Navigate to={back} replace />;
        return <Navigate to="/home" replace />;
    }

    const [code, setCode] = useState<string>('');
    const [language, setLanguage] = useState<string>('');

    const pollingRef = useRef<number | null>(null);
    const submissions = useAppSelector(
        (state) => state.submin.submitsById[missionIdNumber] || [],
    );
    const submissionsRef = useRef(submissions);

    const startPolling = () => {
        if (pollingRef.current) return;

        pollingRef.current = setInterval(async () => {
            if (contestId) {
                dispatch(fetchMyAttemptsInContest(contestId));
            }
            dispatch(fetchMySubmitsByMission(missionIdNumber));

            const hasWaiting = submissionsRef.current.some(
                (s: any) =>
                    s.solution.status == 'Waiting' ||
                    s.solution.testerState === 'Waiting' ||
                    s.solution.status === 'Compiling' ||
                    s.solution.testerState === 'Compiling',
            );
            if (!hasWaiting) {
                // Всё проверено — стоп
                if (pollingRef.current) {
                    clearInterval(pollingRef.current);
                    pollingRef.current = null;
                }
            }
        }, 5000); // 10 секунд
    };

    useEffect(() => {
        if (contestId) {
            dispatch(fetchMyAttemptsInContest(contestId));
        }
    }, [contestId]);

    useEffect(() => {
        dispatch(fetchMissionById(missionIdNumber));
        dispatch(fetchMySubmitsByMission(missionIdNumber));
    }, [missionIdNumber]);

    useEffect(() => {}, [submissions]);

    useEffect(() => {
        return () => {
            if (pollingRef.current) {
                clearInterval(pollingRef.current);
                pollingRef.current = null;
            }
        };
    }, []);
    useEffect(() => {
        if (missionStatus == 'failed') {
            setMissionsStatus({ key: 'fetchById', status: 'idle' });
            navigate(back ?? '/home/missions');
        }
    }, [missionStatus]);

    useEffect(() => {
        submissionsRef.current = submissions;

        if (submissions.length) {
            const hasWaiting = submissions.some(
                (s) =>
                    s.solution.status === 'Waiting' ||
                    s.solution.testerState === 'Waiting' ||
                    s.solution.status === 'Compiling' ||
                    s.solution.testerState === 'Compiling',
            );

            if (hasWaiting) {
                startPolling();
            }
        }
    }, [submissions]);

    if (!mission || !mission.statements || mission.statements.length === 0) {
        return <div>Загрузка...</div>;
    }

    interface StatementData {
        id: number;
        legend?: string;
        timeLimit?: number;
        output?: string;
        input?: string;
        sampleTests?: any[];
        name?: string;
        memoryLimit?: number;
        tags?: string[];
        notes?: string;
        html?: string;
        mediaFiles?: any[];
    }

    let statementData: StatementData = { id: mission.id };

    try {
        // 1. Берём первый statement с форматом Latex и языком russian
        const latexStatement = mission.statements.find(
            (stmt: any) =>
                stmt && stmt.language === 'russian' && stmt.format === 'Latex',
        );

        // 2. Берём первый statement с форматом Html и языком russian
        const htmlStatement = mission.statements.find(
            (stmt: any) =>
                stmt && stmt.language === 'russian' && stmt.format === 'Html',
        );

        if (!latexStatement) throw new Error('Не найден блок Latex на русском');
        if (!htmlStatement) throw new Error('Не найден блок Html на русском');

        // 3. Парсим данные из problem-properties.json
        const statementTexts = JSON.parse(
            latexStatement.statementTexts['problem-properties.json'],
        );

        statementData = {
            id: missionIdNumber,
            legend: statementTexts.legend,
            timeLimit: statementTexts.timeLimit,
            output: statementTexts.output,
            input: statementTexts.input,
            sampleTests: statementTexts.sampleTests,
            name: statementTexts.name,
            memoryLimit: statementTexts.memoryLimit,
            tags: mission.tags,
            notes: statementTexts.notes,
            html: htmlStatement.statementTexts['problem.html'],
            mediaFiles: latexStatement.mediaFiles,
        };
    } catch (err) {}

    return (
        <div className="h-screen grid grid-rows-[60px,1fr]">
            <div className="">
                <Header missionId={missionIdNumber} back={back} />
            </div>

            <div className="grid grid-cols-2 h-full min-h-0 gap-[20px]">
                <div className="overflow-y-auto min-h-0  overflow-hidden">
                    <Statement {...statementData} />
                </div>

                <div className="overflow-y-auto min-h-0 overflow-hidden pb-[20px]">
                    <div className=" grid grid-rows-[1fr,45px,230px] grid-flow-row h-full w-full gap-[20px] ">
                        <div className="w-full relative ">
                            <CodeEditor
                                onChange={(value: string) => {
                                    setCode(value);
                                }}
                                onChangeLanguage={(value: string) => {
                                    setLanguage(value);
                                }}
                            />
                        </div>
                        <div>
                            <PrimaryButton
                                text="Отправить"
                                onClick={async () => {
                                    await dispatch(
                                        submitMission({
                                            missionId: missionIdNumber,
                                            language: language,
                                            languageVersion: 'latest',
                                            sourceCode: code,
                                            contestAttemptId:
                                                attempt?.attemptId,
                                        }),
                                    ).unwrap();
                                    dispatch(
                                        fetchMySubmitsByMission(
                                            missionIdNumber,
                                        ),
                                    );
                                }}
                            />
                        </div>

                        <div className="h-full w-full ">
                            <MissionSubmissions
                                missionId={missionIdNumber}
                                contestId={contestId}
                            />
                        </div>
                    </div>
                </div>
            </div>
        </div>
    );
};

export default Mission;