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

export const getExam = async (
	module: Module,
	avoidRepeated: boolean,
	variant?: Variant,
	instructorGender?: InstructorGender,
): Promise<Exam | undefined> => {
	const url = new URLSearchParams();
	url.append("avoidRepeated", avoidRepeated.toString());

	if (variant) url.append("variant", variant);
	if (module === "speaking" && instructorGender) url.append("instructorGender", instructorGender);

	const examRequest = await axios<Exam[]>(`/api/exam/${module}?${url.toString()}`);
	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 defaultExamUserSolutions = (exam: Exam) => {
	if (exam.module === "reading" || exam.module === "listening" || exam.module === "level")
		return (exam.parts.flatMap((x) => x.exercises) ?? []).map((x) => defaultUserSolutions(x, exam));

	return (exam.exercises ?? []).map((x) => defaultUserSolutions(x, exam));
};

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 "trueFalse":
			total = exercise.questions.length;
			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 } };
	}
};