/* eslint-disable @next/next/no-img-element */
import Modal from "@/components/Modal";
import useStats from "@/hooks/useStats";
import useUsers from "@/hooks/useUsers";
import {CorporateUser, Group, Stat, User} from "@/interfaces/user";
import UserList from "@/pages/(admin)/Lists/UserList";
import {dateSorter} from "@/utils";
import moment from "moment";
import {useEffect, 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";

interface Props {
	user: User;
}

export default function TeacherDashboard({user}: Props) {
	const [page, setPage] = useState("");
	const [selectedUser, setSelectedUser] = useState<User>();
	const [showModal, setShowModal] = useState(false);
	const [selectedAssignment, setSelectedAssignment] = useState<Assignment>();
	const [isCreatingAssignment, setIsCreatingAssignment] = useState(false);
	const [corporateUserToShow, setCorporateUserToShow] = useState<CorporateUser>();

	const {stats} = useStats();
	const {users, reload} = useUsers();
	const {groups} = useGroups(user.id);
	const {assignments, isLoading: isAssignmentsLoading, reload: reloadAssignments} = useAssignments({assigner: user.id});

	useEffect(() => {
		setShowModal(!!selectedUser && page === "");
	}, [selectedUser, page]);

	useEffect(() => {
		getUserCorporate(user.id).then(setCorporateUserToShow);
	}, [user]);

	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 (
			<>
				<div className="flex flex-col gap-4">
					<div
						onClick={() => setPage("")}
						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 ({users.filter(filter).length})</h2>
				</div>

				<UserList user={user} filters={[filter]} />
			</>
		);
	};

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

		return (
			<>
				<div className="flex flex-col gap-4">
					<div
						onClick={() => setPage("")}
						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 AssignmentsPage = () => {
		const activeFilter = (a: Assignment) =>
			moment(a.endDate).isAfter(moment()) && moment(a.startDate).isBefore(moment()) && a.assignees.length > a.results.length;
		const pastFilter = (a: Assignment) => moment(a.endDate).isBefore(moment()) || a.assignees.length === a.results.length;
		const futureFilter = (a: Assignment) => moment(a.startDate).isAfter(moment());

		return (
			<>
				<AssignmentView
					isOpen={!!selectedAssignment && !isCreatingAssignment}
					onClose={() => {
						setSelectedAssignment(undefined);
						setIsCreatingAssignment(false);
					}}
					assignment={selectedAssignment}
				/>
				<AssignmentCreator
					assignment={selectedAssignment}
					groups={groups.filter((x) => x.admin === user.id || x.participants.includes(user.id))}
					users={users.filter(
						(x) =>
							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)),
					)}
					assigner={user.id}
					isCreating={isCreatingAssignment}
					cancelCreation={() => {
						setIsCreatingAssignment(false);
						setSelectedAssignment(undefined);
						reloadAssignments();
					}}
				/>
				<div className="w-full flex justify-between items-center">
					<div
						onClick={() => setPage("")}
						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>
					<div
						onClick={reloadAssignments}
						className="flex gap-2 items-center text-mti-purple-light cursor-pointer hover:text-mti-purple-dark transition ease-in-out duration-300">
						<span>Reload</span>
						<BsArrowRepeat className={clsx("text-xl", isAssignmentsLoading && "animate-spin")} />
					</div>
				</div>
				<section className="flex flex-col gap-4">
					<h2 className="text-2xl font-semibold">Active Assignments ({assignments.filter(activeFilter).length})</h2>
					<div className="flex flex-wrap gap-2">
						{assignments.filter(activeFilter).map((a) => (
							<AssignmentCard {...a} onClick={() => setSelectedAssignment(a)} key={a.id} />
						))}
					</div>
				</section>
				<section className="flex flex-col gap-4">
					<h2 className="text-2xl font-semibold">Planned Assignments ({assignments.filter(futureFilter).length})</h2>
					<div className="flex flex-wrap gap-2">
						<div
							onClick={() => setIsCreatingAssignment(true)}
							className="w-[250px] h-[200px] flex flex-col gap-2 items-center justify-center bg-white hover:bg-mti-purple-ultralight text-mti-purple-light hover:text-mti-purple-dark border border-mti-gray-platinum hover:drop-shadow p-4 cursor-pointer rounded-xl transition ease-in-out duration-300">
							<BsPlus className="text-6xl" />
							<span className="text-lg">New Assignment</span>
						</div>
						{assignments.filter(futureFilter).map((a) => (
							<AssignmentCard
								{...a}
								onClick={() => {
									setSelectedAssignment(a);
									setIsCreatingAssignment(true);
								}}
								key={a.id}
							/>
						))}
					</div>
				</section>
				<section className="flex flex-col gap-4">
					<h2 className="text-2xl font-semibold">Past Assignments ({assignments.filter(pastFilter).length})</h2>
					<div className="flex flex-wrap gap-2">
						{assignments.filter(pastFilter).map((a) => (
							<AssignmentCard {...a} onClick={() => setSelectedAssignment(a)} key={a.id} allowDownload />
						))}
					</div>
				</section>
			</>
		);
	};

	const DefaultDashboard = () => (
		<>
			{corporateUserToShow && (
				<div className="absolute top-4 right-4 bg-neutral-200 px-2 rounded-lg py-1">
					Linked to: <b>{corporateUserToShow?.corporateInformation?.companyInformation.name || corporateUserToShow.name}</b>
				</div>
			)}
			<section
				className={clsx(
					"flex -lg:flex-wrap gap-4 items-center -lg:justify-center lg:justify-start text-center",
					!!corporateUserToShow && "mt-12 xl:mt-6",
				)}>
				<IconCard
					onClick={() => setPage("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"
				/>
				<IconCard Icon={BsPeople} label="Groups" value={groups.length} color="purple" onClick={() => setPage("groups")} />
				<div
					onClick={() => setPage("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.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" ? () => setPage("students") : undefined
								}
								onViewTeachers={selectedUser.type === "corporate" ? () => setPage("teachers") : undefined}
								user={selectedUser}
							/>
						</div>
					)}
				</>
			</Modal>
			{page === "students" && <StudentsList />}
			{page === "groups" && <GroupsList />}
			{page === "assignments" && <AssignmentsPage />}
			{page === "" && <DefaultDashboard />}
		</>
	);
}
