import Layout from "@/components/High/Layout";
import Separator from "@/components/Low/Separator";
import AssignmentCard from "@/components/AssignmentCard";
import AssignmentView from "@/components/AssignmentView";
import { useAllowedEntities } from "@/hooks/useEntityPermissions";
import { useListSearch } from "@/hooks/useListSearch";
import usePagination from "@/hooks/usePagination";
import { EntityWithRoles } from "@/interfaces/entity";
import { Assignment } from "@/interfaces/results";
import { CorporateUser, Group, User } from "@/interfaces/user";
import { sessionOptions } from "@/lib/session";
import { getUserCompanyName } from "@/resources/user";
import { findBy, mapBy, redirect, serialize } from "@/utils";
import { requestUser } from "@/utils/api";
import {
	activeAssignmentFilter,
	archivedAssignmentFilter,
	futureAssignmentFilter,
	pastAssignmentFilter,
	startHasExpiredAssignmentFilter,
} from "@/utils/assignments";
import { getAssignments, getEntitiesAssignments } from "@/utils/assignments.be";
import { getEntitiesWithRoles } from "@/utils/entities.be";
import { getGroups, getGroupsByEntities } from "@/utils/groups.be";
import { checkAccess, findAllowedEntities } from "@/utils/permissions";
import { getEntitiesUsers, getUsers } from "@/utils/users.be";
import { withIronSessionSsr } from "iron-session/next";
import { groupBy } from "lodash";
import Head from "next/head";
import Link from "next/link";
import { useRouter } from "next/router";
import { useMemo, useState } from "react";
import { BsChevronLeft, BsPlus } from "react-icons/bs";

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

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

	const entityIDS = mapBy(user.entities, "id") || [];
	const entities = await (checkAccess(user, ["developer", "admin"]) ? getEntitiesWithRoles() : getEntitiesWithRoles(entityIDS));

	const allowedEntities = findAllowedEntities(user, entities, "view_assignments")

	const users =
		await (checkAccess(user, ["developer", "admin"]) ? getUsers() : getEntitiesUsers(mapBy(allowedEntities, 'id')));

	const assignments =
		await (checkAccess(user, ["developer", "admin"]) ? getAssignments() : getEntitiesAssignments(mapBy(allowedEntities, 'id')));

	return { props: serialize({ user, users, entities: allowedEntities, assignments }) };
}, sessionOptions);

const SEARCH_FIELDS = [["name"]];

interface Props {
	assignments: Assignment[];
	entities: EntityWithRoles[]
	user: User;
	users: User[];
}

export default function AssignmentsPage({ assignments, entities, user, users }: Props) {
	const entitiesAllowCreate = useAllowedEntities(user, entities, 'create_assignment')
	const entitiesAllowEdit = useAllowedEntities(user, entities, 'edit_assignment')
	const entitiesAllowArchive = useAllowedEntities(user, entities, 'archive_assignment')

	const activeAssignments = useMemo(() => assignments.filter(activeAssignmentFilter), [assignments]);
	const plannedAssignments = useMemo(() => assignments.filter(futureAssignmentFilter), [assignments]);
	const pastAssignments = useMemo(() => assignments.filter(pastAssignmentFilter), [assignments]);
	const startExpiredAssignments = useMemo(() => assignments.filter(startHasExpiredAssignmentFilter), [assignments]);
	const archivedAssignments = useMemo(() => assignments.filter(archivedAssignmentFilter), [assignments]);

	const router = useRouter();

	const { rows: activeRows, renderSearch: renderActive } = useListSearch(SEARCH_FIELDS, activeAssignments);
	const { rows: plannedRows, renderSearch: renderPlanned } = useListSearch(SEARCH_FIELDS, plannedAssignments);
	const { rows: pastRows, renderSearch: renderPast } = useListSearch(SEARCH_FIELDS, pastAssignments);
	const { rows: expiredRows, renderSearch: renderExpired } = useListSearch(SEARCH_FIELDS, startExpiredAssignments);
	const { rows: archivedRows, renderSearch: renderArchived } = useListSearch(SEARCH_FIELDS, archivedAssignments);

	const { items: activeItems, renderMinimal: paginationActive } = usePagination(activeRows, 16);
	const { items: plannedItems, renderMinimal: paginationPlanned } = usePagination(plannedRows, 16);
	const { items: pastItems, renderMinimal: paginationPast } = usePagination(pastRows, 16);
	const { items: expiredItems, renderMinimal: paginationExpired } = usePagination(expiredRows, 16);
	const { items: archivedItems, renderMinimal: paginationArchived } = usePagination(archivedRows, 16);

	return (
		<>
			<Head>
				<title>Assignments | 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>
			<Layout user={user}>
				<div className="flex flex-col gap-4">
					<div className="flex items-center gap-2">
						<Link href="/dashboard" className="text-mti-purple hover:text-mti-purple-dark transition ease-in-out duration-300 text-xl">
							<BsChevronLeft />
						</Link>
						<h2 className="font-bold text-2xl">Assignments</h2>
					</div>
					<Separator />
				</div>
				<div className="flex flex-col gap-2">
					<span className="text-lg font-bold">Active Assignments Status</span>
					<div className="flex items-center gap-4">
						<span>
							<b>Total:</b> {activeAssignments.reduce((acc, curr) => acc + curr.results.length, 0)}/
							{activeAssignments.reduce((acc, curr) => curr.exams.length + acc, 0)}
						</span>
					</div>
				</div>

				<section className="flex flex-col gap-4">
					<h2 className="text-2xl font-semibold">Active Assignments ({activeAssignments.length})</h2>
					<div className="w-full flex items-center gap-4">
						{renderActive()}
						{paginationActive()}
					</div>
					<div className="flex flex-wrap gap-2">
						{activeItems.map((a) => (
							<AssignmentCard {...a} entityObj={findBy(entities, 'id', a.entity)} users={users} onClick={() => router.push(`/assignments/${a.id}`)} key={a.id} />
						))}
					</div>
				</section>

				<section className="flex flex-col gap-4">
					<h2 className="text-2xl font-semibold">Planned Assignments ({plannedAssignments.length})</h2>
					<div className="w-full flex items-center gap-4">
						{renderPlanned()}
						{paginationPlanned()}
					</div>
					<div className="flex flex-wrap gap-2">
						<Link
							href={entitiesAllowCreate.length > 0 ? "/assignments/creator" : ""}
							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>
						</Link>
						{plannedItems.map((a) => (
							<AssignmentCard
								{...a}
								users={users}
								entityObj={findBy(entities, 'id', a.entity)}
								onClick={
									mapBy(entitiesAllowEdit, 'id').includes(a.entity || "")
										? () => router.push(`/assignments/creator/${a.id}`)
										: () => router.push(`/assignments/${a.id}`)
								}
								key={a.id}
							/>
						))}
					</div>
				</section>

				<section className="flex flex-col gap-4">
					<h2 className="text-2xl font-semibold">Past Assignments ({pastAssignments.length})</h2>
					<div className="w-full flex items-center gap-4">
						{renderPast()}
						{paginationPast()}
					</div>
					<div className="flex flex-wrap gap-2">
						{pastItems.map((a) => (
							<AssignmentCard
								{...a}
								users={users}
								entityObj={findBy(entities, 'id', a.entity)}
								onClick={() => router.push(`/assignments/${a.id}`)}
								key={a.id}
								allowDownload
								allowArchive={mapBy(entitiesAllowArchive, 'id').includes(a.entity || "")}
								allowExcelDownload
							/>
						))}
					</div>
				</section>
				<section className="flex flex-col gap-4">
					<h2 className="text-2xl font-semibold">Assignments start expired ({startExpiredAssignments.length})</h2>
					<div className="w-full flex items-center gap-4">
						{renderExpired()}
						{paginationExpired()}
					</div>
					<div className="flex flex-wrap gap-2">
						{expiredItems.map((a) => (
							<AssignmentCard
								{...a}
								users={users}
								entityObj={findBy(entities, 'id', a.entity)}
								onClick={() => router.push(`/assignments/${a.id}`)}
								key={a.id}
								allowDownload
								allowArchive={mapBy(entitiesAllowArchive, 'id').includes(a.entity || "")}
								allowExcelDownload
							/>
						))}
					</div>
				</section>
				<section className="flex flex-col gap-4">
					<h2 className="text-2xl font-semibold">Archived Assignments ({archivedAssignments.length})</h2>
					<div className="w-full flex items-center gap-4">
						{renderArchived()}
						{paginationArchived()}
					</div>
					<div className="flex flex-wrap gap-2">
						{archivedItems.map((a) => (
							<AssignmentCard
								{...a}
								users={users}
								onClick={() => router.push(`/assignments/${a.id}`)}
								key={a.id}
								entityObj={findBy(entities, 'id', a.entity)}
								allowDownload
								allowUnarchive
								allowExcelDownload
							/>
						))}
					</div>
				</section>
			</Layout>
		</>
	);
}