/* 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,
	BsClipboard2Data,
	BsClipboard2DataFill,
	BsClock,
	BsGlobeCentralSouthAsia,
	BsPaperclip,
	BsPerson,
	BsPersonAdd,
	BsPersonFill,
	BsPersonFillGear,
	BsPersonGear,
	BsPencilSquare,
	BsPersonBadge,
	BsPersonCheck,
	BsPeople,
	BsArrowRepeat,
	BsPlus,
	BsEnvelopePaper,
} from "react-icons/bs";
import UserCard from "@/components/UserCard";
import useGroups from "@/hooks/useGroups";
import {averageLevelCalculator, 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 useFilterStore from "@/stores/listFilterStore";
import {useRouter} from "next/router";
import useCodes from "@/hooks/useCodes";
import {getUserCorporate} from "@/utils/groups";
import useAssignments from "@/hooks/useAssignments";
import {Assignment} from "@/interfaces/results";
import AssignmentView from "./AssignmentView";
import AssignmentCreator from "./AssignmentCreator";
import clsx from "clsx";
import AssignmentCard from "./AssignmentCard";
import {createColumnHelper} from "@tanstack/react-table";
import Checkbox from "@/components/Low/Checkbox";
import List from "@/components/List";
import {getUserCompanyName} from "@/resources/user";
import {futureAssignmentFilter, pastAssignmentFilter, archivedAssignmentFilter, activeAssignmentFilter} from "@/utils/assignments";
import useUserBalance from "@/hooks/useUserBalance";
import AssignmentsPage from "./views/AssignmentsPage";

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

type StudentPerformanceItem = User & {corporateName: string; group: string};
const StudentPerformanceList = ({items, stats, users}: {items: StudentPerformanceItem[]; stats: Stat[]; users: User[]}) => {
	const [isShowingAmount, setIsShowingAmount] = useState(false);

	const columnHelper = createColumnHelper<StudentPerformanceItem>();

	const columns = [
		columnHelper.accessor("name", {
			header: "Student Name",
			cell: (info) => info.getValue(),
		}),
		columnHelper.accessor("email", {
			header: "E-mail",
			cell: (info) => info.getValue(),
		}),
		columnHelper.accessor("demographicInformation.passport_id", {
			header: "ID",
			cell: (info) => info.getValue() || "N/A",
		}),
		columnHelper.accessor("group", {
			header: "Group",
			cell: (info) => info.getValue(),
		}),
		columnHelper.accessor("corporateName", {
			header: "Corporate",
			cell: (info) => info.getValue() || "N/A",
		}),
		columnHelper.accessor("levels.reading", {
			header: "Reading",
			cell: (info) =>
				!isShowingAmount
					? info.getValue() || 0
					: `${Object.keys(groupByExam(stats.filter((x) => x.module === "reading" && x.user === info.row.original.id))).length} exams`,
		}),
		columnHelper.accessor("levels.listening", {
			header: "Listening",
			cell: (info) =>
				!isShowingAmount
					? info.getValue() || 0
					: `${Object.keys(groupByExam(stats.filter((x) => x.module === "listening" && x.user === info.row.original.id))).length} exams`,
		}),
		columnHelper.accessor("levels.writing", {
			header: "Writing",
			cell: (info) =>
				!isShowingAmount
					? info.getValue() || 0
					: `${Object.keys(groupByExam(stats.filter((x) => x.module === "writing" && x.user === info.row.original.id))).length} exams`,
		}),
		columnHelper.accessor("levels.speaking", {
			header: "Speaking",
			cell: (info) =>
				!isShowingAmount
					? info.getValue() || 0
					: `${Object.keys(groupByExam(stats.filter((x) => x.module === "speaking" && x.user === info.row.original.id))).length} exams`,
		}),
		columnHelper.accessor("levels.level", {
			header: "Level",
			cell: (info) =>
				!isShowingAmount
					? info.getValue() || 0
					: `${Object.keys(groupByExam(stats.filter((x) => x.module === "level" && x.user === info.row.original.id))).length} exams`,
		}),
		columnHelper.accessor("levels", {
			id: "overall_level",
			header: "Overall",
			cell: (info) =>
				!isShowingAmount
					? averageLevelCalculator(
							users,
							stats.filter((x) => x.user === info.row.original.id),
					  ).toFixed(1)
					: `${Object.keys(groupByExam(stats.filter((x) => x.user === info.row.original.id))).length} exams`,
		}),
	];

	return (
		<div className="flex flex-col gap-4 w-full h-full">
			<Checkbox isChecked={isShowingAmount} onChange={setIsShowingAmount}>
				Show Utilization
			</Checkbox>
			<List<StudentPerformanceItem>
				data={items.sort(
					(a, b) =>
						averageLevelCalculator(
							users,
							stats.filter((x) => x.user === b.id),
						) -
						averageLevelCalculator(
							users,
							stats.filter((x) => x.user === a.id),
						),
				)}
				columns={columns}
			/>
		</div>
	);
};

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

	const {data: stats} = useFilterRecordsByUser<Stat[]>();
	const {users, reload, isLoading} = useUsers();
	const {groups} = useGroups({admin: user.id});
	const {assignments, isLoading: isAssignmentsLoading, reload: reloadAssignments} = useAssignments({corporate: user.id});
	const {balance} = useUserBalance();

	const appendUserFilters = useFilterStore((state) => state.appendUserFilter);
	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) || false
						: 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 teacherFilter = (user: User) => user.type === "teacher" && 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 TeachersList = () => {
		const filter = (x: User) =>
			x.type === "teacher" &&
			(!!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">Teachers ({total})</h2>
					</div>
				)}
			/>
		);
	};

	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={() => 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 StudentPerformancePage = () => {
		const students = users
			.filter((x) => x.type === "student" && groups.flatMap((g) => g.participants).includes(x.id))
			.map((u) => ({
				...u,
				group: groups.find((x) => x.participants.includes(u.id))?.name || "N/A",
				corporateName: getUserCompanyName(u, users, groups),
			}));

		return (
			<>
				<div className="w-full flex justify-between items-center">
					<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>
					<div
						onClick={reload}
						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", isLoading && "animate-spin")} />
					</div>
				</div>
				<StudentPerformanceList items={students} stats={stats} users={users} />
			</>
		);
	};

	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="grid grid-cols-5 -md:grid-cols-2 gap-4 text-center">
				<IconCard
					onClick={() => router.push("/#students")}
					Icon={BsPersonFill}
					label="Students"
					value={users.filter(studentFilter).length}
					color="purple"
				/>
				<IconCard
					onClick={() => router.push("/#teachers")}
					Icon={BsPencilSquare}
					label="Teachers"
					value={users.filter(teacherFilter).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 onClick={() => router.push("/#groups")} Icon={BsPeople} label="Groups" value={groups.length} color="purple" />
				<IconCard
					Icon={BsPersonCheck}
					label="User Balance"
					value={`${balance}/${user.corporateInformation?.companyInformation?.userAmount || 0}`}
					color="purple"
				/>
				<IconCard
					Icon={BsClock}
					label="Expiration Date"
					value={user.subscriptionExpirationDate ? moment(user.subscriptionExpirationDate).format("DD/MM/yyyy") : "Unlimited"}
					color="rose"
				/>
				<IconCard
					Icon={BsPersonFillGear}
					label="Student Performance"
					value={users.filter(studentFilter).length}
					color="purple"
					onClick={() => router.push("/#studentsPerformance")}
				/>
				<button
					disabled={isAssignmentsLoading}
					onClick={() => router.push("/#assignments")}
					className="bg-white col-span-2 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">
							{isAssignmentsLoading ? "Loading..." : assignments.filter((a) => !a.archived).length}
						</span>
					</span>
				</button>
			</section>

			<section className="grid grid-cols-1 md:grid-cols-2 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">Latest teachers</span>
					<div className="flex flex-col items-start h-96 overflow-scroll scrollbar-hide">
						{users
							.filter(teacherFilter)
							.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"
										? () => {
												appendUserFilters({
													id: "view-students",
													filter: (x: User) => x.type === "student",
												});
												appendUserFilters({
													id: "belongs-to-admin",
													filter: (x: User) =>
														groups
															.filter((g) => g.admin === selectedUser.id || g.participants.includes(selectedUser.id))
															.flatMap((g) => g.participants)
															.includes(x.id),
												});

												router.push("/list/users");
										  }
										: undefined
								}
								onViewTeachers={
									selectedUser.type === "corporate" || selectedUser.type === "student"
										? () => {
												appendUserFilters({
													id: "view-teachers",
													filter: (x: User) => x.type === "teacher",
												});
												appendUserFilters({
													id: "belongs-to-admin",
													filter: (x: User) =>
														groups
															.filter((g) => g.admin === selectedUser.id || g.participants.includes(selectedUser.id))
															.flatMap((g) => g.participants)
															.includes(x.id),
												});

												router.push("/list/users");
										  }
										: undefined
								}
								user={selectedUser}
							/>
						</div>
					)}
				</>
			</Modal>
			{router.asPath === "/#students" && <StudentsList />}
			{router.asPath === "/#teachers" && <TeachersList />}
			{router.asPath === "/#groups" && <GroupsList />}
			{router.asPath === "/#assignments" && (
				<AssignmentsPage
					assignments={assignments}
					groups={assignmentsGroups}
					users={assignmentsUsers}
					reloadAssignments={reloadAssignments}
					isLoading={isAssignmentsLoading}
					onBack={() => router.push("/")}
				/>
			)}
			{router.asPath === "/#studentsPerformance" && <StudentPerformancePage />}
			{router.asPath === "/" && <DefaultDashboard />}
		</>
	);
}