import Select from "@/components/Low/Select";
import {Difficulty, LevelExam, MultipleChoiceExercise, MultipleChoiceQuestion} from "@/interfaces/exam";
import useExamStore from "@/stores/examStore";
import {getExamById} from "@/utils/exams";
import {playSound} from "@/utils/sound";
import {Tab} from "@headlessui/react";
import axios from "axios";
import clsx from "clsx";
import {capitalize, sample} from "lodash";
import {useRouter} from "next/router";
import {useState} from "react";
import {BsArrowRepeat, BsCheck, BsPencilSquare, BsX} from "react-icons/bs";
import {toast} from "react-toastify";
import {v4} from "uuid";

const DIFFICULTIES: Difficulty[] = ["easy", "medium", "hard"];

const QuestionDisplay = ({question, onUpdate}: {question: MultipleChoiceQuestion; onUpdate: (question: MultipleChoiceQuestion) => void}) => {
	const [isEditing, setIsEditing] = useState(false);
	const [options, setOptions] = useState(question.options);

	return (
		<div key={question.id} className="flex flex-col gap-1">
			<span className="font-semibold">
				{question.id}. {question.prompt}{" "}
			</span>
			<div className="flex flex-col gap-1">
				{question.options.map((option, index) => (
					<span key={option.id} className={clsx(question.solution === option.id && "font-bold")}>
						<span className={clsx("font-semibold", question.solution === option.id ? "text-mti-green-light" : "text-ielts-level")}>
							({option.id})
						</span>{" "}
						{isEditing ? (
							<input
								defaultValue={option.text}
								className="w-60"
								onChange={(e) => setOptions((prev) => prev.map((x, idx) => (idx === index ? {...x, text: e.target.value} : x)))}
							/>
						) : (
							<span>{option.text}</span>
						)}
					</span>
				))}
			</div>
			<div className="flex gap-2 mt-2 w-full">
				{!isEditing && (
					<button
						onClick={() => setIsEditing(true)}
						className="p-2 border border-neutral-300 bg-white rounded-xl hover:drop-shadow transition ease-in-out duration-300">
						<BsPencilSquare />
					</button>
				)}
				{isEditing && (
					<>
						<button
							onClick={() => {
								onUpdate({...question, options});
								setIsEditing(false);
							}}
							className="p-2 border border-neutral-300 bg-white rounded-xl hover:drop-shadow transition ease-in-out duration-300">
							<BsCheck />
						</button>
						<button
							onClick={() => setIsEditing(false)}
							className="p-2 border border-neutral-300 bg-white rounded-xl hover:drop-shadow transition ease-in-out duration-300">
							<BsX />
						</button>
					</>
				)}
			</div>
		</div>
	);
};

const TaskTab = ({exam, difficulty, setExam}: {exam?: LevelExam; difficulty: Difficulty; setExam: (exam: LevelExam) => void}) => {
	const [isLoading, setIsLoading] = useState(false);

	const generate = () => {
		const url = new URLSearchParams();
		url.append("difficulty", difficulty);

		setIsLoading(true);
		axios
			.get(`/api/exam/level/generate/level?${url.toString()}`)
			.then((result) => {
				playSound(typeof result.data === "string" ? "error" : "check");
				if (typeof result.data === "string") return toast.error("Something went wrong, please try to generate again.");
				setExam(result.data);
			})
			.catch((error) => {
				console.log(error);
				toast.error("Something went wrong!");
			})
			.finally(() => setIsLoading(false));
	};

	const onUpdate = (question: MultipleChoiceQuestion) => {
		if (!exam) return;

		const updatedExam = {
			...exam,
			parts: exam.parts.map((p) =>
				p.exercises.map((x) => ({
					...x,
					questions: (x as MultipleChoiceExercise).questions.map((q) => (q.id === question.id ? question : q)),
				})),
			),
		};
		console.log(updatedExam);
		setExam(updatedExam as any);
	};

	return (
		<Tab.Panel className="w-full bg-ielts-level/20 min-h-[600px] h-full rounded-xl p-6 flex flex-col gap-4">
			<div className="flex gap-4 items-end">
				<button
					onClick={generate}
					disabled={isLoading}
					className={clsx(
						"bg-ielts-level/70 border border-ielts-level text-white w-full px-6 py-6 rounded-xl h-[70px]",
						"hover:bg-ielts-level disabled:bg-ielts-level/40 disabled:cursor-not-allowed",
						"transition ease-in-out duration-300",
					)}>
					{isLoading ? (
						<div className="flex items-center justify-center">
							<BsArrowRepeat className="text-white animate-spin" size={25} />
						</div>
					) : (
						"Generate"
					)}
				</button>
			</div>
			{isLoading && (
				<div className="w-fit h-fit mt-12 self-center animate-pulse flex flex-col gap-8 items-center">
					<span className={clsx("loading loading-infinity w-32 text-ielts-level")} />
					<span className={clsx("font-bold text-2xl text-ielts-level")}>Generating...</span>
				</div>
			)}
			{exam && (
				<div className="flex flex-col gap-2 w-full overflow-y-scroll scrollbar-hide h-full">
					{exam.parts
						.flatMap((x) => x.exercises)
						.filter((x) => x.type === "multipleChoice")
						.map((ex) => {
							const exercise = ex as MultipleChoiceExercise;

							return (
								<div key={ex.id} className="w-full h-full flex flex-col gap-2">
									<div className="flex gap-2">
										<span className="text-xl font-semibold">Multiple Choice</span>
										<span className="rounded-xl bg-white border border-ielts-level p-1 px-4 w-fit">
											{exercise.questions.length} questions
										</span>
									</div>
									<div className="grid grid-cols-1 md:grid-cols-2 lg:grid-cols-3 gap-6">
										{exercise.questions.map((question) => (
											<QuestionDisplay question={question} onUpdate={onUpdate} key={question.id} />
										))}
									</div>
								</div>
							);
						})}
				</div>
			)}
		</Tab.Panel>
	);
};

const LevelGeneration = () => {
	const [generatedExam, setGeneratedExam] = useState<LevelExam>();
	const [isLoading, setIsLoading] = useState(false);
	const [resultingExam, setResultingExam] = useState<LevelExam>();
	const [difficulty, setDifficulty] = useState<Difficulty>(sample(DIFFICULTIES)!);

	const router = useRouter();

	const setExams = useExamStore((state) => state.setExams);
	const setSelectedModules = useExamStore((state) => state.setSelectedModules);

	const loadExam = async (examId: string) => {
		const exam = await getExamById("level", examId.trim());
		if (!exam) {
			toast.error("Unknown Exam ID! Please make sure you selected the right module and entered the right exam ID", {
				toastId: "invalid-exam-id",
			});

			return;
		}

		setExams([exam]);
		setSelectedModules(["level"]);

		router.push("/exercises");
	};

	const submitExam = () => {
		if (!generatedExam) {
			toast.error("Please generate all tasks before submitting");
			return;
		}

		setIsLoading(true);
		const exam: LevelExam = {
			...generatedExam,
			isDiagnostic: false,
			minTimer: 25,
			module: "level",
			id: v4(),
		};

		axios
			.post(`/api/exam/level`, exam)
			.then((result) => {
				playSound("sent");
				console.log(`Generated Exam ID: ${result.data.id}`);
				toast.success("This new exam has been generated successfully! Check the ID in our browser's console.");
				setResultingExam(result.data);

				setGeneratedExam(undefined);
			})
			.catch((error) => {
				console.log(error);
				toast.error("Something went wrong while generating, please try again later.");
			})
			.finally(() => setIsLoading(false));
	};

	return (
		<>
			<div className="flex gap-4 w-1/2">
				<div className="flex flex-col gap-3 w-full">
					<label className="font-normal text-base text-mti-gray-dim">Difficulty</label>
					<Select
						options={DIFFICULTIES.map((x) => ({value: x, label: capitalize(x)}))}
						onChange={(value) => (value ? setDifficulty(value.value as Difficulty) : null)}
						value={{value: difficulty, label: capitalize(difficulty)}}
					/>
				</div>
			</div>
			<Tab.Group>
				<Tab.List className="flex space-x-1 rounded-xl bg-ielts-level/20 p-1">
					<Tab
						className={({selected}) =>
							clsx(
								"w-full rounded-lg py-2.5 text-sm font-medium leading-5 text-ielts-level/70",
								"ring-white ring-opacity-60 ring-offset-2 ring-offset-ielts-level focus:outline-none focus:ring-2",
								"transition duration-300 ease-in-out",
								selected ? "bg-white shadow" : "text-blue-100 hover:bg-white/[0.12] hover:text-ielts-level",
							)
						}>
						Exam
					</Tab>
				</Tab.List>
				<Tab.Panels>
					<TaskTab difficulty={difficulty} exam={generatedExam} setExam={setGeneratedExam} />
				</Tab.Panels>
			</Tab.Group>
			<div className="w-full flex justify-end gap-4">
				{resultingExam && (
					<button
						disabled={isLoading}
						onClick={() => loadExam(resultingExam.id)}
						className={clsx(
							"bg-white border border-ielts-level text-ielts-level w-full max-w-[200px] rounded-xl h-[70px] self-end",
							"hover:bg-ielts-level hover:text-white disabled:bg-ielts-level/40 disabled:cursor-not-allowed",
							"transition ease-in-out duration-300",
						)}>
						Perform Exam
					</button>
				)}
				<button
					disabled={!generatedExam || isLoading}
					data-tip="Please generate all three passages"
					onClick={submitExam}
					className={clsx(
						"bg-ielts-level/70 border border-ielts-level text-white w-full max-w-[200px] rounded-xl h-[70px] self-end",
						"hover:bg-ielts-level disabled:bg-ielts-level/40 disabled:cursor-not-allowed",
						"transition ease-in-out duration-300",
						!generatedExam && "tooltip",
					)}>
					{isLoading ? (
						<div className="flex items-center justify-center">
							<BsArrowRepeat className="text-white animate-spin" size={25} />
						</div>
					) : (
						"Submit"
					)}
				</button>
			</div>
		</>
	);
};

export default LevelGeneration;
