/* eslint-disable @next/next/no-img-element */
import Layout from "@/components/High/Layout";
import IconCard from "@/dashboards/IconCard";
import {Module} from "@/interfaces";
import {EntityWithRoles} from "@/interfaces/entity";
import {Assignment} from "@/interfaces/results";
import {Group, Stat, User} from "@/interfaces/user";
import {sessionOptions} from "@/lib/session";
import {dateSorter, filterBy, mapBy, serialize} from "@/utils";
import {getEntitiesAssignments} from "@/utils/assignments.be";
import {getEntitiesWithRoles} from "@/utils/entities.be";
import {getGroupsByEntities} from "@/utils/groups.be";
import {checkAccess} from "@/utils/permissions";
import {calculateAverageLevel, calculateBandScore} from "@/utils/score";
import {groupByExam} from "@/utils/stats";
import {getStatsByUsers} from "@/utils/stats.be";
import {getEntitiesUsers} from "@/utils/users.be";
import {withIronSessionSsr} from "iron-session/next";
import {uniqBy} from "lodash";
import moment from "moment";
import Head from "next/head";
import Link from "next/link";
import {useMemo} from "react";
import {
	BsClipboard2Data,
	BsClock,
	BsEnvelopePaper,
	BsPaperclip,
	BsPencilSquare,
	BsPeople,
	BsPeopleFill,
	BsPersonFill,
	BsPersonFillGear,
} from "react-icons/bs";
import {ToastContainer} from "react-toastify";

interface Props {
	user: User;
	users: User[];
	entities: EntityWithRoles[];
	assignments: Assignment[];
	stats: Stat[];
	groups: Group[];
}

export const getServerSideProps = withIronSessionSsr(async ({req, res}) => {
	const user = req.session.user as User | undefined;

	if (!user) {
		return {
			redirect: {
				destination: "/login",
				permanent: false,
			},
		};
	}

	if (!checkAccess(user, ["admin", "developer", "teacher"]))
		return {
			redirect: {
				destination: "/dashboard",
				permanent: false,
			},
		};

	const entityIDS = mapBy(user.entities, "id") || [];

	const users = await getEntitiesUsers(entityIDS);
	const entities = await getEntitiesWithRoles(entityIDS);
	const assignments = await getEntitiesAssignments(entityIDS);
	const stats = await getStatsByUsers(users.map((u) => u.id));
	const groups = await getGroupsByEntities(entityIDS);

	return {props: serialize({user, users, entities, assignments, stats, groups})};
}, sessionOptions);

export default function Dashboard({user, users, entities, assignments, stats, groups}: Props) {
	const students = useMemo(() => users.filter((u) => u.type === "student"), [users]);

	const averageLevelCalculator = (studentStats: Stat[]) => {
		const formattedStats = studentStats
			.map((s) => ({
				focus: students.find((u) => u.id === s.user)?.focus,
				score: s.score,
				module: s.module,
			}))
			.filter((f) => !!f.focus);
		const bandScores = formattedStats.map((s) => ({
			module: s.module,
			level: calculateBandScore(s.score.correct, s.score.total, s.module, s.focus!),
		}));

		const levels: {[key in Module]: number} = {
			reading: 0,
			listening: 0,
			writing: 0,
			speaking: 0,
			level: 0,
		};
		bandScores.forEach((b) => (levels[b.module] += b.level));

		return calculateAverageLevel(levels);
	};

	const UserDisplay = (displayUser: User) => (
		<div className="flex w-full p-4 gap-4 items-center hover:bg-mti-purple-ultralight cursor-pointer transition ease-in-out duration-300">
			<img src={displayUser.profilePicture} alt={displayUser.name} className="rounded-full w-10 h-10" />
			<div className="flex flex-col gap-1 items-start">
				<span>{displayUser.name}</span>
				<span className="text-sm opacity-75">{displayUser.email}</span>
			</div>
		</div>
	);

	return (
		<>
			<Head>
				<title>EnCoach</title>
				<meta
					name="description"
					content="A training platform for the IELTS exam provided by the Muscat Training Institute and developed by eCrop."
				/>
				<meta name="viewport" content="width=device-width, initial-scale=1" />
				<link rel="icon" href="/favicon.ico" />
			</Head>
			<ToastContainer />
			<Layout user={user}>
				<div className="w-full flex flex-col gap-4">
					{entities.length > 0 && (
						<div className="w-fit self-end bg-neutral-200 px-2 rounded-lg py-1">
							<b>{mapBy(entities, "label")?.join(", ")}</b>
						</div>
					)}
					<section className="grid grid-cols-5 -md:grid-cols-2 place-items-center gap-4 text-center">
						<IconCard Icon={BsPersonFill} label="Students" value={students.length} color="purple" />
						<IconCard Icon={BsPeople} label="Classrooms" value={groups.length} color="purple" />
						<IconCard Icon={BsClipboard2Data} label="Exams Performed" value={uniqBy(stats, "exam").length} color="purple" />
						<IconCard Icon={BsPaperclip} label="Average Level" value={averageLevelCalculator(stats).toFixed(1)} color="purple" />
						<IconCard Icon={BsEnvelopePaper} label="Assignments" value={assignments.filter((a) => !a.archived).length} color="purple" />
					</section>
				</div>

				<section className="grid grid-cols-1 md:grid-cols-2 gap-4 w-full justify-between">
					<div className="bg-white border shadow flex flex-col rounded-xl w-full">
						<span className="p-4">Latest students</span>
						<div className="flex flex-col items-start h-96 overflow-scroll scrollbar-hide">
							{students
								.sort((a, b) => dateSorter(a, b, "desc", "registrationDate"))
								.map((x) => (
									<UserDisplay key={x.id} {...x} />
								))}
						</div>
					</div>
					<div className="bg-white border shadow flex flex-col rounded-xl w-full">
						<span className="p-4">Highest level students</span>
						<div className="flex flex-col items-start h-96 overflow-scroll scrollbar-hide">
							{students
								.sort((a, b) => calculateAverageLevel(b.levels) - calculateAverageLevel(a.levels))
								.map((x) => (
									<UserDisplay key={x.id} {...x} />
								))}
						</div>
					</div>
					<div className="bg-white border shadow flex flex-col rounded-xl w-full">
						<span className="p-4">Highest exam count students</span>
						<div className="flex flex-col items-start h-96 overflow-scroll scrollbar-hide">
							{students
								.sort(
									(a, b) =>
										Object.keys(groupByExam(filterBy(stats, "user", b))).length -
										Object.keys(groupByExam(filterBy(stats, "user", a))).length,
								)
								.map((x) => (
									<UserDisplay key={x.id} {...x} />
								))}
						</div>
					</div>
				</section>
			</Layout>
		</>
	);
}
