import {Module} from "@/interfaces";
import {Exam, ReadingExam, ListeningExam, WritingExam, SpeakingExam, Exercise, UserSolution, LevelExam} from "@/interfaces/exam";
import axios from "axios";

export const getExam = async (module: Module, avoidRepeated: boolean): Promise<Exam | undefined> => {
	const examRequest = await axios<Exam[]>(`/api/exam/${module}?avoidRepeated=${avoidRepeated}`);
	if (examRequest.status !== 200) {
		return undefined;
	}

	const newExam = examRequest.data;

	switch (module) {
		case "reading":
			return newExam.shift() as ReadingExam;
		case "listening":
			return newExam.shift() as ListeningExam;
		case "writing":
			return newExam.shift() as WritingExam;
		case "speaking":
			return newExam.shift() as SpeakingExam;
		case "level":
			return newExam.shift() as LevelExam;
	}
};

export const getExamById = async (module: Module, id: string): Promise<Exam | undefined> => {
	const examRequest = await axios<Exam>(`/api/exam/${module}/${id}`);
	if (examRequest.status !== 200) {
		return undefined;
	}

	const newExam = examRequest.data;

	switch (module) {
		case "reading":
			return newExam as ReadingExam;
		case "listening":
			return newExam as ListeningExam;
		case "writing":
			return newExam as WritingExam;
		case "speaking":
			return newExam as SpeakingExam;
		case "level":
			return newExam as LevelExam;
	}
};

export const defaultUserSolutions = (exercise: Exercise, exam: Exam): UserSolution => {
	const defaultSettings = {
		exam: exam.id,
		exercise: exercise.id,
		solutions: [],
		module: exam.module,
		type: exercise.type,
	};

	let total = 0;
	switch (exercise.type) {
		case "fillBlanks":
			total = exercise.text.match(/({{\d+}})/g)?.length || 0;
			return {...defaultSettings, score: {correct: 0, total, missing: total}};
		case "matchSentences":
			total = exercise.sentences.length;
			return {...defaultSettings, score: {correct: 0, total, missing: total}};
		case "multipleChoice":
			total = exercise.questions.length;
			return {...defaultSettings, score: {correct: 0, total, missing: total}};
		case "writeBlanks":
			total = exercise.text.match(/({{\d+}})/g)?.length || 0;
			return {...defaultSettings, score: {correct: 0, total, missing: total}};
		case "writing":
			total = 1;
			return {...defaultSettings, score: {correct: 0, total, missing: total}};
		case "speaking":
			total = 1;
			return {...defaultSettings, score: {correct: 0, total, missing: total}};
		default:
			return {...defaultSettings, score: {correct: 0, total: 0, missing: 0}};
	}
};