/* eslint-disable @next/next/no-img-element */
import Modal from "@/components/Modal";
import useFilterRecordsByUser from "@/hooks/useFilterRecordsByUser";
import useUsers from "@/hooks/useUsers";
import {CorporateUser, Group, MasterCorporateUser, Stat, User} from "@/interfaces/user";
import UserList from "@/pages/(admin)/Lists/UserList";
import {dateSorter} from "@/utils";
import moment from "moment";
import {useEffect, useMemo, useState} from "react";
import {
	BsArrowLeft,
	BsArrowRepeat,
	BsClipboard2Data,
	BsClipboard2DataFill,
	BsClipboard2Heart,
	BsClipboard2X,
	BsClipboardPulse,
	BsClock,
	BsEnvelopePaper,
	BsGlobeCentralSouthAsia,
	BsPaperclip,
	BsPeople,
	BsPerson,
	BsPersonAdd,
	BsPersonFill,
	BsPersonFillGear,
	BsPersonGear,
	BsPlus,
	BsRepeat,
	BsRepeat1,
} from "react-icons/bs";
import UserCard from "@/components/UserCard";
import useGroups from "@/hooks/useGroups";
import {calculateAverageLevel, calculateBandScore} from "@/utils/score";
import {MODULE_ARRAY} from "@/utils/moduleUtils";
import {Module} from "@/interfaces";
import {groupByExam} from "@/utils/stats";
import IconCard from "./IconCard";
import GroupList from "@/pages/(admin)/Lists/GroupList";
import useAssignments from "@/hooks/useAssignments";
import {Assignment} from "@/interfaces/results";
import AssignmentCard from "./AssignmentCard";
import Button from "@/components/Low/Button";
import clsx from "clsx";
import ProgressBar from "@/components/Low/ProgressBar";
import AssignmentCreator from "./AssignmentCreator";
import AssignmentView from "./AssignmentView";
import {getUserCorporate} from "@/utils/groups";
import {checkAccess} from "@/utils/permissions";
import usePermissions from "@/hooks/usePermissions";
import {futureAssignmentFilter, pastAssignmentFilter, archivedAssignmentFilter, activeAssignmentFilter} from "@/utils/assignments";
import AssignmentsPage from "./views/AssignmentsPage";
import {useRouter} from "next/router";

interface Props {
	user: User;
	linkedCorporate?: CorporateUser | MasterCorporateUser;
}

export default function TeacherDashboard({user, linkedCorporate}: Props) {
	const [selectedUser, setSelectedUser] = useState<User>();
	const [showModal, setShowModal] = useState(false);

	const {data: stats} = useFilterRecordsByUser<Stat[]>();
	const {users, reload} = useUsers();
	const {groups} = useGroups({adminAdmins: user.id});
	const {permissions} = usePermissions(user.id);
	const {assignments, isLoading: isAssignmentsLoading, reload: reloadAssignments} = useAssignments({assigner: user.id});

	const router = useRouter();

	const assignmentsGroups = useMemo(() => groups.filter((x) => x.admin === user.id || x.participants.includes(user.id)), [groups, user.id]);

	const assignmentsUsers = useMemo(
		() =>
			users.filter(
				(x) =>
					x.type === "student" &&
					(!!selectedUser
						? groups
								.filter((g) => g.admin === selectedUser.id)
								.flatMap((g) => g.participants)
								.includes(x.id)
						: groups.flatMap((g) => g.participants).includes(x.id)),
			),
		[groups, users, selectedUser],
	);

	useEffect(() => {
		setShowModal(!!selectedUser && router.asPath === "/#");
	}, [selectedUser, router.asPath]);

	const studentFilter = (user: User) => user.type === "student" && groups.flatMap((g) => g.participants).includes(user.id);

	const getStatsByStudent = (user: User) => stats.filter((s) => s.user === user.id);

	const UserDisplay = (displayUser: User) => (
		<div
			onClick={() => setSelectedUser(displayUser)}
			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>
	);

	const StudentsList = () => {
		const filter = (x: User) =>
			x.type === "student" &&
			(!!selectedUser
				? groups
						.filter((g) => g.admin === selectedUser.id)
						.flatMap((g) => g.participants)
						.includes(x.id) || false
				: groups.flatMap((g) => g.participants).includes(x.id));

		return (
			<UserList
				user={user}
				filters={[filter]}
				renderHeader={(total) => (
					<div className="flex flex-col gap-4">
						<div
							onClick={() => router.push("/")}
							className="flex gap-2 items-center text-mti-purple-light cursor-pointer hover:text-mti-purple-dark transition ease-in-out duration-300">
							<BsArrowLeft className="text-xl" />
							<span>Back</span>
						</div>
						<h2 className="text-2xl font-semibold">Students ({total})</h2>
					</div>
				)}
			/>
		);
	};

	const GroupsList = () => {
		const filter = (x: Group) => x.admin === user.id;

		return (
			<>
				<div className="flex flex-col gap-4">
					<div
						onClick={() => router.push("/")}
						className="flex gap-2 items-center text-mti-purple-light cursor-pointer hover:text-mti-purple-dark transition ease-in-out duration-300">
						<BsArrowLeft className="text-xl" />
						<span>Back</span>
					</div>
					<h2 className="text-2xl font-semibold">Groups ({groups.filter(filter).length})</h2>
				</div>

				<GroupList user={user} />
			</>
		);
	};

	const averageLevelCalculator = (studentStats: Stat[]) => {
		const formattedStats = studentStats
			.map((s) => ({
				focus: users.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 DefaultDashboard = () => (
		<>
			{linkedCorporate && (
				<div className="absolute top-4 right-4 bg-neutral-200 px-2 rounded-lg py-1">
					Linked to: <b>{linkedCorporate?.corporateInformation?.companyInformation.name || linkedCorporate.name}</b>
				</div>
			)}
			<section
				className={clsx(
					"flex -lg:flex-wrap gap-4 items-center -lg:justify-center lg:justify-start text-center",
					!!linkedCorporate && "mt-12 xl:mt-6",
				)}>
				<IconCard
					onClick={() => router.push("/#students")}
					Icon={BsPersonFill}
					label="Students"
					value={users.filter(studentFilter).length}
					color="purple"
				/>
				<IconCard
					Icon={BsClipboard2Data}
					label="Exams Performed"
					value={stats.filter((s) => groups.flatMap((g) => g.participants).includes(s.user)).length}
					color="purple"
				/>
				<IconCard
					Icon={BsPaperclip}
					label="Average Level"
					value={averageLevelCalculator(stats.filter((s) => groups.flatMap((g) => g.participants).includes(s.user))).toFixed(1)}
					color="purple"
				/>
				{checkAccess(user, ["teacher", "developer"], permissions, "viewGroup") && (
					<IconCard
						Icon={BsPeople}
						label="Groups"
						value={groups.filter((x) => x.admin === user.id).length}
						color="purple"
						onClick={() => router.push("/#groups")}
					/>
				)}
				<div
					onClick={() => router.push("/#assignments")}
					className="bg-white rounded-xl shadow p-4 flex flex-col gap-4 items-center w-96 h-52 justify-center cursor-pointer hover:shadow-xl transition ease-in-out duration-300">
					<BsEnvelopePaper className="text-6xl text-mti-purple-light" />
					<span className="flex flex-col gap-1 items-center text-xl">
						<span className="text-lg">Assignments</span>
						<span className="font-semibold text-mti-purple-light">{assignments.filter((a) => !a.archived).length}</span>
					</span>
				</div>
			</section>

			<section className="grid grid-cols-1 md:grid-cols-2 lg:grid-cols-3 gap-4 w-full justify-between">
				<div className="bg-white 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">
						{users
							.filter(studentFilter)
							.sort((a, b) => dateSorter(a, b, "desc", "registrationDate"))
							.map((x) => (
								<UserDisplay key={x.id} {...x} />
							))}
					</div>
				</div>
				<div className="bg-white 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">
						{users
							.filter(studentFilter)
							.sort((a, b) => calculateAverageLevel(b.levels) - calculateAverageLevel(a.levels))
							.map((x) => (
								<UserDisplay key={x.id} {...x} />
							))}
					</div>
				</div>
				<div className="bg-white 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">
						{users
							.filter(studentFilter)
							.sort(
								(a, b) =>
									Object.keys(groupByExam(getStatsByStudent(b))).length - Object.keys(groupByExam(getStatsByStudent(a))).length,
							)
							.map((x) => (
								<UserDisplay key={x.id} {...x} />
							))}
					</div>
				</div>
			</section>
		</>
	);

	return (
		<>
			<Modal isOpen={showModal} onClose={() => setSelectedUser(undefined)}>
				<>
					{selectedUser && (
						<div className="w-full flex flex-col gap-8">
							<UserCard
								loggedInUser={user}
								onClose={(shouldReload) => {
									setSelectedUser(undefined);
									if (shouldReload) reload();
								}}
								onViewStudents={
									selectedUser.type === "corporate" || selectedUser.type === "teacher" ? () => router.push("/#students") : undefined
								}
								onViewTeachers={selectedUser.type === "corporate" ? () => router.push("/#teachers") : undefined}
								user={selectedUser}
							/>
						</div>
					)}
				</>
			</Modal>
			{router.asPath === "/#students" && <StudentsList />}
			{router.asPath === "/#groups" && <GroupsList />}
			{router.asPath === "/#assignments" && (
				<AssignmentsPage
					assignments={assignments}
					groups={assignmentsGroups}
					users={assignmentsUsers}
					user={user}
					reloadAssignments={reloadAssignments}
					isLoading={isAssignmentsLoading}
					onBack={() => router.push("/")}
				/>
			)}
			{router.asPath === "/" && <DefaultDashboard />}
		</>
	);
}
