import { useParams, Navigate } from 'react-router-dom';
import CodeEditor from '../views/mission/codeeditor/CodeEditor';
import Statement, { StatementData } 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 } from '../redux/slices/missions';
import Header from '../views/mission/statement/Header';
import MissionSubmissions from '../views/mission/statement/MissionSubmissions';

const Mission = () => {

  const dispatch = useAppDispatch();

  // Получаем параметры из URL
  const { missionId } = useParams<{ missionId: string }>();
  const mission = useAppSelector((state) => state.missions.currentMission);
  const missionIdNumber = Number(missionId);
  if (!missionId || isNaN(missionIdNumber)) {
    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] || []);

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

  useEffect(() => {
    return () => {
      if (pollingRef.current) {
        clearInterval(pollingRef.current);
        pollingRef.current = null;
      }
    };
  }, []);


  useEffect(() => {
    if (submissions.length === 0) return;

    const hasWaiting = submissions.some(
      s => s.solution.status === "Waiting" || s.solution.testerState === "Waiting"
    );

    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) {
    console.error("Ошибка парсинга statementTexts:", err);
  }




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

    pollingRef.current = setInterval(async () => {
      dispatch(fetchMySubmitsByMission(missionIdNumber));

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



  return (

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

                })).unwrap();
                dispatch(fetchMySubmitsByMission(missionIdNumber));
              }} />
            </div>

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

export default Mission;