/* 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, mapBy} from "@/utils";
import moment from "moment";
import {useEffect, useMemo, useState} from "react";
import {
	BsArrowLeft,
	BsClipboard2Data,
	BsClock,
	BsPaperclip,
	BsPersonFill,
	BsPersonFillGear,
	BsPencilSquare,
	BsPersonCheck,
	BsPeople,
	BsEnvelopePaper,
	BsDatabase,
} from "react-icons/bs";
import UserCard from "@/components/UserCard";
import useGroups from "@/hooks/useGroups";
import {calculateAverageLevel, calculateBandScore} from "@/utils/score";
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 useAssignments from "@/hooks/useAssignments";
import useUserBalance from "@/hooks/useUserBalance";
import AssignmentsPage from "../views/AssignmentsPage";
import StudentPerformancePage from "./StudentPerformancePage";
import MasterStatisticalPage from "./MasterStatisticalPage";
import {getEntitiesUsers} from "@/utils/users.be";

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

const studentHash = {
	type: "student",
	orderBy: "registrationDate",
	size: 25,
};

const teacherHash = {
	type: "teacher",
	orderBy: "registrationDate",
	size: 25,
};

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

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

	const {users: students, total: totalStudents, reload: reloadStudents, isLoading: isStudentsLoading} = useUsers(studentHash);
	const {users: teachers, total: totalTeachers, reload: reloadTeachers, isLoading: isTeachersLoading} = useUsers(teacherHash);

	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]);

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

	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 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 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);
	};

	if (router.asPath === "/#students")
		return (
			<UserList
				user={user}
				type="student"
				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>
				)}
			/>
		);

	if (router.asPath === "/#teachers")
		return (
			<UserList
				user={user}
				type="teacher"
				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>
				)}
			/>
		);

	if (router.asPath === "/#groups") return <GroupsList />;
	if (router.asPath === "/#studentsPerformance") return <StudentPerformancePage user={user} />;

	if (router.asPath === "/#assignments")
		return (
			<AssignmentsPage
				assignments={assignments}
				user={user}
				groups={assignmentsGroups}
				reloadAssignments={reloadAssignments}
				isLoading={isAssignmentsLoading}
				onBack={() => router.push("/")}
			/>
		);

	if (router.asPath === "/#statistical") return <MasterStatisticalPage user={user} />;

	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 && selectedUser!.type === "student") reloadStudents();
									if (shouldReload && selectedUser!.type === "teacher") reloadTeachers();
								}}
								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>

			<>
				{!!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")}
						isLoading={isStudentsLoading}
						Icon={BsPersonFill}
						label="Students"
						value={totalStudents}
						color="purple"
					/>
					<IconCard
						onClick={() => router.push("/#teachers")}
						isLoading={isTeachersLoading}
						Icon={BsPencilSquare}
						label="Teachers"
						value={totalTeachers}
						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}
						isLoading={isStudentsLoading}
						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}
						isLoading={isStudentsLoading}
						label="Student Performance"
						value={totalStudents}
						color="purple"
						onClick={() => router.push("/#studentsPerformance")}
					/>
					<IconCard Icon={BsDatabase} label="Master Statistical" color="purple" onClick={() => router.push("/#statistical")} />
					<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">
							{students
								.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">
							{teachers
								.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">
							{students
								.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">
							{students
								.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>
			</>
		</>
	);
}
