/* eslint-disable @next/next/no-img-element */
import Layout from "@/components/High/Layout";
import UserDisplayList from "@/components/UserDisplayList";
import IconCard from "@/components/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, redirect, serialize } from "@/utils";
import { requestUser } from "@/utils/api";
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 { filterAllowedUsers } from "@/utils/users.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 { useRouter } from "next/router";
import { useMemo } from "react";
import {
	BsClipboard2Data,
	BsClock,
	BsEnvelopePaper,
	BsPaperclip,
	BsPencilSquare,
	BsPeople,
	BsPeopleFill,
	BsPersonFill,
	BsPersonFillGear,
} from "react-icons/bs";
import { ToastContainer } from "react-toastify";
import { useAllowedEntities } from "@/hooks/useEntityPermissions";

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

export const getServerSideProps = withIronSessionSsr(async ({ req, res }) => {
	const user = await requestUser(req, res)
	if (!user) return redirect("/login")

	if (!checkAccess(user, ["admin", "developer", "corporate"])) return redirect("/")

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

	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 teachers = useMemo(() => users.filter((u) => u.type === "teacher"), [users]);

	const allowedEntityStatistics = useAllowedEntities(user, entities, 'view_entity_statistics')

	const router = useRouter();

	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);
	};

	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
							onClick={() => router.push("/users?type=student")}
							Icon={BsPersonFill}
							label="Students"
							value={students.length}
							color="purple"
						/>
						<IconCard
							onClick={() => router.push("/users?type=teacher")}
							Icon={BsPencilSquare}
							label="Teachers"
							value={teachers.length}
							color="purple"
						/>
						<IconCard
							onClick={() => router.push("/classrooms")}
							Icon={BsPeople}
							label="Classrooms"
							value={groups.length}
							color="purple"
						/>
						<IconCard Icon={BsPeopleFill}
							onClick={() => router.push("/entities")}
							label="Entities"
							value={entities.length}
							color="purple"
						/>
						<IconCard Icon={BsClipboard2Data} label="Exams Performed" value={uniqBy(stats, "exam").length} color="purple" />
						{allowedEntityStatistics.length > 0 && (
							<IconCard Icon={BsPersonFillGear}
								onClick={() => router.push("/statistical")}
								label="Entity Statistics"
								value={allowedEntityStatistics.length}
								color="purple"
							/>
						)}
						<IconCard Icon={BsPersonFillGear}
							onClick={() => router.push("/users/performance")}
							label="Student Performance"
							value={students.length}
							color="purple"
						/>
						<IconCard
							Icon={BsClock}
							label="Expiration Date"
							value={user.subscriptionExpirationDate ? moment(user.subscriptionExpirationDate).format("DD/MM/yyyy") : "Unlimited"}
							color="rose"
						/>
						<IconCard
							Icon={BsEnvelopePaper}
							className="col-span-2"
							onClick={() => router.push("/assignments")}
							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">
					<UserDisplayList
						users={students.sort((a, b) => dateSorter(a, b, "desc", "registrationDate"))}
						title="Latest Students"
					/>
					<UserDisplayList
						users={teachers.sort((a, b) => dateSorter(a, b, "desc", "registrationDate"))}
						title="Latest Teachers"
					/>
					<UserDisplayList
						users={students.sort((a, b) => calculateAverageLevel(b.levels) - calculateAverageLevel(a.levels))}
						title="Highest level students"
					/>
					<UserDisplayList
						users={
							students
								.sort(
									(a, b) =>
										Object.keys(groupByExam(filterBy(stats, "user", b))).length -
										Object.keys(groupByExam(filterBy(stats, "user", a))).length,
								)
						}
						title="Highest exam count students"
					/>
				</section>
			</Layout>
		</>
	);
}
