frontAnswerer/src/utils/hooks/useQuestionFlowControl.ts

import { QuizQuestionResult } from "@model/questionTypes/result";
import { AnyTypedQuizQuestion } from "@model/questionTypes/shared";
import { setCurrentQuizStep, useQuizViewStore } from "@stores/quizView/store";
import { useCallback, useDebugValue, useMemo, useState } from "react";
import { isResultQuestionEmpty } from "../../pages/ViewPublicationPage/tools/checkEmptyData";
import { useQuizData } from "./useQuizData";


export function useQuestionFlowControl() {
    const { settings, questions } = useQuizData();
    const [currentQuestion, setCurrentQuestion] = useState<AnyTypedQuizQuestion>(getFirstQuestion);
    const answers = useQuizViewStore(state => state.answers);

    const linearQuestionIndex = questions.every(({ content }) => content.rule.parentId !== "root") // null when branching enabled
        ? questions.indexOf(currentQuestion)
        : null;

    function getFirstQuestion() {
        if (questions.length === 0) throw new Error("No questions found");

        if (settings.cfg.haveRoot) {
            const nextQuestion = questions.find(
                question => question.id === settings.cfg.haveRoot || question.content.id === settings.cfg.haveRoot
            );
            if (!nextQuestion) throw new Error("Root question not found");

            return nextQuestion;
        }

        return questions[0];
    }

    const nextQuestionId = useMemo(() => {
        console.log("Смотрим какой вопрос будет дальше. Что у нас сегодня вкусненького? Щя покажу от какого вопроса мы ищем следующий шаг");
        console.log(currentQuestion);
        console.log("От вот этого /|");

        //вопрос обязателен, анализируем ответ и условия ветвления
        if (answers.length) {
            let readyBeNextQuestion = "";
            const answer = answers.find(({ questionId }) => questionId === currentQuestion.id);

            currentQuestion.content.rule.main.forEach(({ next, rules }) => {
                const longerArray = Math.max(
                    rules[0].answers.length,
                    answer?.answer && Array.isArray(answer?.answer) ? answer?.answer.length : [answer?.answer].length
                );

                for (let i = 0; i < longerArray; i++) {
                    if (Array.isArray(answer?.answer)) {
                        if (answer?.answer.find((item) => String(item === rules[0].answers[i]))) {
                            readyBeNextQuestion = next; // Ес­ли хоть один эле­мент от­ли­ча­ет­ся, мас­си­вы не рав­ны
                        }

                        return;
                    }

                    if (String(rules[0].answers[i]) === answer?.answer) {
                        readyBeNextQuestion = next; // Ес­ли хоть один эле­мент от­ли­ча­ет­ся, мас­си­вы не рав­ны
                    }
                }
            });

            if (readyBeNextQuestion) return readyBeNextQuestion;
        }

        if (!currentQuestion.required) {//вопрос не обязателен и не нашли совпадений между ответами и условиями ветвления
            console.log("вопрос не обязателен ищем дальше");
            const defaultNextQuestionId = currentQuestion.content.rule.default;
            if (defaultNextQuestionId.length > 1 && defaultNextQuestionId !== " ") return defaultNextQuestionId;
            //Вопросы типа страница, ползунок, своё поле для ввода и дата не могут иметь больше 1 ребёнка. Пользователь не может настроить там дефолт
            //Кинуть на ребёнка надо даже если там нет дефолта
            if (
                ["date", "page", "text", "number"].includes(currentQuestion.type)
                && currentQuestion.content.rule.children.length === 1
            ) return currentQuestion.content.rule.children[0];
        }

        //ничё не нашли, ищем резулт 
        console.log("ничё не нашли, ищем резулт ");
        return questions.find(q => {
            return q.type === "result" && q.content.rule.parentId === currentQuestion.content.id;
        })?.id;
    }, [answers, currentQuestion, questions]);

    const prevQuestion = linearQuestionIndex !== null
        ? questions[linearQuestionIndex - 1]
        : questions.find(q =>
            q.id === currentQuestion.content.rule.parentId
            || q.content.id === currentQuestion.content.rule.parentId
        );

    const nextQuestion = linearQuestionIndex !== null
        ? questions[linearQuestionIndex + 1]
        : questions.find(q => q.id === nextQuestionId || q.content.id === nextQuestionId);

    const resultQuestion = useMemo(() => {
        let resultQuestion: QuizQuestionResult | undefined;

        if (currentQuestion.type === "result") resultQuestion = currentQuestion;
        if (settings.cfg.haveRoot) {
            resultQuestion = questions.find((question): question is QuizQuestionResult => {
                return question.type === "result" && question.content.rule.parentId === currentQuestion.content.id;
            });
        } else {
            resultQuestion = questions.find((question): question is QuizQuestionResult => {
                return question.type === "result" && question.content.rule.parentId === "line";
            });
        }

        if (resultQuestion && !isResultQuestionEmpty(resultQuestion)) return resultQuestion;
    }, [currentQuestion, questions, settings.cfg.haveRoot]);

    const showResult = useCallback(() => {
        if (!resultQuestion) throw new Error("Result question not found");

        setCurrentQuestion(resultQuestion);

        if (settings.cfg.resultInfo.showResultForm === "after") {
            setCurrentQuizStep("contactform");
        }
    }, [resultQuestion, settings.cfg.resultInfo.showResultForm]);

    const showResultAfterContactForm = useCallback(() => {
        if (!resultQuestion) throw new Error("Result question not found");
        if (resultQuestion.type !== "result") throw new Error("Current question is not a result question");

        setCurrentQuizStep("question");
    }, [resultQuestion]);

    const moveToPrevQuestion = useCallback(() => {
        if (!prevQuestion) throw new Error("Previous question not found");

        setCurrentQuestion(prevQuestion);
    }, [prevQuestion]);

    const moveToNextQuestion = useCallback(() => {
        if (!nextQuestion) throw new Error("Next question not found");

        if (nextQuestion.type === "result") return showResult();

        setCurrentQuestion(nextQuestion);
    }, [nextQuestion, showResult]);

    const isPreviousButtonEnabled = Boolean(prevQuestion);

    const isNextButtonEnabled = useMemo(() => {
        const hasAnswer = answers.some(({ questionId }) => questionId === currentQuestion.id);

        if ("required" in currentQuestion.content && currentQuestion.content.required) {
            return hasAnswer;
        }

        return Boolean(nextQuestion);
    }, [answers, currentQuestion.content, currentQuestion.id, nextQuestion]);

    useDebugValue({
        linearQuestionIndex,
        currentQuestion,
        prevQuestion,
        nextQuestion,
        resultQuestion,
    });

    return {
        currentQuestion,
        currentQuestionStepNumber: linearQuestionIndex && linearQuestionIndex + 1,
        isNextButtonEnabled,
        isPreviousButtonEnabled,
        moveToPrevQuestion,
        moveToNextQuestion,
        showResultAfterContactForm,
    };
}