frontPanel/src/pages/ViewPublicationPage/Footer.tsx

import { useState, useEffect } from "react";
import { Box, Button, useTheme } from "@mui/material";

import { useQuizViewStore } from "@root/quizView";

import type { AnyTypedQuizQuestion, QuizQuestionBase } from "../../model/questionTypes/shared";
import { getQuestionByContentId } from "@root/questions/actions";
import { enqueueSnackbar } from "notistack";

type FooterProps = {
  questions: AnyTypedQuizQuestion[];
  setCurrentQuestion: (step: AnyTypedQuizQuestion) => void;
  question: AnyTypedQuizQuestion;
};

export const Footer = ({
  setCurrentQuestion,
  questions,
  question,
}: FooterProps) => {
  const [disablePreviousButton, setDisablePreviousButton] =
    useState<boolean>(false);
  const [disableNextButton, setDisableNextButton] = useState<boolean>(false);
  const { answers } = useQuizViewStore();
  const theme = useTheme();
  const linear = !questions.find(
    ({ content }) => content.rule.parentId === "root"
  );

  useEffect(() => {
    // Логика для аргумента disabled у кнопки "Назад"
    if (linear) {
      const questionIndex = questions.findIndex(({ id }) => id === question.id);

      const previousQuestion = questions[questionIndex - 1];

      if (previousQuestion) {
        setDisablePreviousButton(false);
      } else {
        setDisablePreviousButton(true);
      }
    } else {
      if (question?.content.rule.parentId === "root") {
        setDisablePreviousButton(true);
      } else {
        setDisablePreviousButton(false);
      }
    }

    // Логика для аргумента disabled у кнопки "Далее"
    const answer = answers.find(
      ({ questionId }) => questionId === question.content.id
    );

    if ("required" in question.content && question.content.required && answer) {
      setDisableNextButton(false);

      return;
    }

    if (
      "required" in question.content &&
      question.content.required &&
      !answer
    ) {
      setDisableNextButton(true);

      return;
    }

    if (linear) {
      const questionIndex = questions.findIndex(({ id }) => id === question.id);

      const nextQuestion = questions[questionIndex + 1];

      if (nextQuestion) {
        setDisableNextButton(false);
      } else {
        setDisableNextButton(true);
      }
    } else {
      const nextQuestionId = getNextQuestionId();
      if (nextQuestionId) {
        setDisableNextButton(false);
      } else {
        const nextQuestion = getQuestionByContentId(
          question.content.rule.default
        );
        if (nextQuestion?.type) {
          setDisableNextButton(false);
        } else {
          setDisableNextButton(true);
        }
      }
    }
  }, [question, answers]);

  const getNextQuestionId = () => {
    if (answers.length) {
      const answer = answers.find(
        ({ questionId }) => questionId === question.content.id
      );

      let readyBeNextQuestion = "";

      (question as QuizQuestionBase).content.rule.main.forEach(({ next, rules }) => {
        let longerArray = Math.max(
          rules[0].answers.length,
          [answer?.answer].length
        );

        for (
          var i = 0;
          i < longerArray;
          i++ // Цикл по всем эле­мен­там бОльшего массива
        ) {
          if (rules[0].answers[i] === answer?.answer) {
            readyBeNextQuestion = next; // Ес­ли хоть один эле­мент от­ли­ча­ет­ся, мас­си­вы не рав­ны
          }
        }
      });

      return readyBeNextQuestion;
    }
  };

  const followPreviousStep = () => {
    if (linear) {
      const questionIndex = questions.findIndex(({ id }) => id === question.id);

      const previousQuestion = questions[questionIndex - 1];

      if (previousQuestion) {
        setCurrentQuestion(previousQuestion);
      }

      return;
    }

    if (question?.content.rule.parentId !== "root") {
      const parent = getQuestionByContentId(question?.content.rule.parentId);
      if (parent?.type) {
        setCurrentQuestion(parent);
      } else {
        enqueueSnackbar("не могу получить предыдущий вопрос");
      }
    } else {
      enqueueSnackbar("вы находитесь на первом вопросе");
    }
  };

  const followNextStep = () => {
    if (linear) {
      const questionIndex = questions.findIndex(({ id }) => id === question.id);

      const nextQuestion = questions[questionIndex + 1];

      if (nextQuestion) {
        setCurrentQuestion(nextQuestion);
      }

      return;
    }

    const nextQuestionId = getNextQuestionId();

    if (nextQuestionId) {
      const nextQuestion = getQuestionByContentId(nextQuestionId);

      if (nextQuestion?.type) {
        setCurrentQuestion(nextQuestion);
        return;
      } else {
        enqueueSnackbar("не могу получить последующий вопрос");
      }
    } else {
      const nextQuestion = getQuestionByContentId(
        question.content.rule.default
      );
      if (nextQuestion?.type) {
        setCurrentQuestion(nextQuestion);
      } else {
        enqueueSnackbar("не могу получить последующий вопрос (дефолтный)");
      }
    }
  };

  return (
    <Box
      sx={{
        padding: "15px 0",
        borderTop: `1px solid ${theme.palette.grey[400]}`,
      }}
    >
      <Box
        sx={{
          width: "100%",
          maxWidth: "1000px",
          padding: "0 10px",
          margin: "0 auto",
          display: "flex",
          alignItems: "center",
          gap: "10px",
        }}
      >
        <Box
          sx={{
            display: "flex",
            alignItems: "center",
            gap: "10px",
            marginRight: "auto",
            color: theme.palette.grey1.main,
          }}
        >
          {/* <Typography>Шаг</Typography>
          <Typography
            sx={{
              display: "flex",
              justifyContent: "center",
              alignItems: "center",
              fontWeight: "bold",
              borderRadius: "50%",
              width: "30px",
              height: "30px",
              color: "#FFF",
              background: theme.palette.brightPurple.main,
            }}
          >
            {stepNumber} */}
          {/* </Typography> */}
          {/* <Typography>Из</Typography>
          <Typography sx={{ fontWeight: "bold" }}>
            {questions.length}
          </Typography> */}
        </Box>
        <Button
          disabled={disablePreviousButton}
          variant="contained"
          sx={{ fontSize: "16px", padding: "10px 15px" }}
          onClick={followPreviousStep}
        >
          ← Назад
        </Button>
        <Button
          disabled={disableNextButton}
          variant="contained"
          sx={{ fontSize: "16px", padding: "10px 15px" }}
          onClick={followNextStep}
        >
          Далее →
        </Button>
      </Box>
    </Box>
  );
};