/* eslint-disable @next/next/no-img-element */
import Tooltip from "@/components/Low/Tooltip";
import { useEntityPermission } from "@/hooks/useEntityPermissions";
import { useListSearch } from "@/hooks/useListSearch";
import usePagination from "@/hooks/usePagination";
import { EntityWithRoles } from "@/interfaces/entity";
import { GroupWithUsers, User } from "@/interfaces/user";
import { sessionOptions } from "@/lib/session";
import { USER_TYPE_LABELS } from "@/resources/user";
import { filterBy, mapBy, redirect, serialize } from "@/utils";
import { requestUser } from "@/utils/api";
import { getEntityWithRoles } from "@/utils/entities.be";
import { convertToUsers, getGroup } from "@/utils/groups.be";
import { shouldRedirectHome } from "@/utils/navigation.disabled";
import { doesEntityAllow } from "@/utils/permissions";
import { getUserName, isAdmin } from "@/utils/users";
import { getEntityUsers, getSpecificUsers } from "@/utils/users.be";
import axios from "axios";
import clsx from "clsx";
import { withIronSessionSsr } from "iron-session/next";
import { capitalize, last } from "lodash";
import moment from "moment";
import Head from "next/head";
import Link from "next/link";
import { useRouter } from "next/router";
import { Divider } from "primereact/divider";
import { useEffect, useMemo, useState } from "react";
import {
  BsBuilding,
  BsChevronLeft,
  BsClockFill,
  BsEnvelopeFill,
  BsFillPersonVcardFill,
  BsPlus,
  BsStopwatchFill,
  BsTag,
  BsTrash,
  BsX,
} from "react-icons/bs";
import { toast, ToastContainer } from "react-toastify";

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

    if (shouldRedirectHome(user)) return redirect("/");

    const { id } = params as { id: string };

    const group = await getGroup(id);
    if (!group || !group.entity) return redirect("/classrooms");

    const entity = await getEntityWithRoles(group.entity);
    if (!entity) return redirect("/classrooms");

    const canView = doesEntityAllow(user, entity, "view_classrooms");
    if (!canView) return redirect("/");
    const [linkedUsers, users] = await Promise.all([
      getEntityUsers(
        entity.id,
        0,
        {},
        {
          _id: 0,
          id: 1,
          name: 1,
          email: 1,
          corporateInformation: 1,
          type: 1,
          profilePicture: 1,
          subscriptionExpirationDate: 1,
          lastLogin: 1,
        }
      ),
      getSpecificUsers([...group.participants, group.admin], {
        _id: 0,
        id: 1,
        name: 1,
        email: 1,
        corporateInformation: 1,
        type: 1,
        profilePicture: 1,
        subscriptionExpirationDate: 1,
        lastLogin: 1,
      }),
    ]);

    const groupWithUser = convertToUsers(group, users);

    return {
      props: serialize({
        user,
        group: groupWithUser,
        users: linkedUsers.filter((x) => (isAdmin(user) ? true : !isAdmin(x))),
        entity,
      }),
    };
  },
  sessionOptions
);

interface Props {
  user: User;
  group: GroupWithUsers;
  users: User[];
  entity: EntityWithRoles;
}

export default function Home({ user, group, users, entity }: Props) {
  const [isAdding, setIsAdding] = useState(false);
  const [isLoading, setIsLoading] = useState(false);
  const [selectedUsers, setSelectedUsers] = useState<string[]>([]);

  const canAddParticipants = useEntityPermission(
    user,
    entity,
    "add_to_classroom"
  );
  const canRemoveParticipants = useEntityPermission(
    user,
    entity,
    "remove_from_classroom"
  );
  const canRenameClassroom = useEntityPermission(
    user,
    entity,
    "rename_classrooms"
  );
  const canDeleteClassroom = useEntityPermission(
    user,
    entity,
    "delete_classroom"
  );

  const nonParticipantUsers = useMemo(
    () =>
      users.filter(
        (x) =>
          ![
            ...group.participants.map((g) => g.id),
            group.admin.id,
            user.id,
          ].includes(x.id)
      ),
    [users, group.participants, group.admin.id, user.id]
  );

  const { rows, renderSearch } = useListSearch<User>(
    [["name"], ["corporateInformation", "companyInformation", "name"]],
    isAdding ? nonParticipantUsers : group.participants
  );
  const { items, renderMinimal } = usePagination<User>(rows, 20);

  const router = useRouter();

  const toggleUser = (u: User) =>
    setSelectedUsers((prev) =>
      prev.includes(u.id) ? prev.filter((p) => p !== u.id) : [...prev, u.id]
    );

  const removeParticipants = () => {
    if (selectedUsers.length === 0) return;
    if (!canRemoveParticipants) return;
    if (
      !confirm(
        `Are you sure you want to remove ${selectedUsers.length} participant${
          selectedUsers.length === 1 ? "" : "s"
        } from this group?`
      )
    )
      return;

    setIsLoading(true);

    axios
      .patch(`/api/groups/${group.id}`, {
        participants: group.participants
          .map((x) => x.id)
          .filter((x) => !selectedUsers.includes(x)),
      })
      .then(() => {
        toast.success("The group has been updated successfully!");
        router.replace(router.asPath);
      })
      .catch((e) => {
        console.error(e);
        toast.error("Something went wrong!");
      })
      .finally(() => setIsLoading(false));
  };

  const addParticipants = () => {
    if (selectedUsers.length === 0) return;
    if (!canAddParticipants || !isAdding) return;
    if (
      !confirm(
        `Are you sure you want to add ${selectedUsers.length} participant${
          selectedUsers.length === 1 ? "" : "s"
        } to this group?`
      )
    )
      return;

    setIsLoading(true);

    axios
      .patch(`/api/groups/${group.id}`, {
        participants: [
          ...group.participants.map((x) => x.id),
          ...selectedUsers,
        ],
      })
      .then(() => {
        toast.success("The group has been updated successfully!");
        router.replace(router.asPath);
      })
      .catch((e) => {
        console.error(e);
        toast.error("Something went wrong!");
      })
      .finally(() => setIsLoading(false));
  };

  const renameGroup = () => {
    if (!canRenameClassroom) return;

    const name = prompt("Rename this classroom:", group.name);
    if (!name) return;

    setIsLoading(true);
    axios
      .patch(`/api/groups/${group.id}`, { name })
      .then(() => {
        toast.success("The classroom has been updated successfully!");
        router.replace(router.asPath);
      })
      .catch((e) => {
        console.error(e);
        toast.error("Something went wrong!");
      })
      .finally(() => setIsLoading(false));
  };

  const deleteGroup = () => {
    if (!canDeleteClassroom) return;
    if (!confirm("Are you sure you want to delete this classroom?")) return;

    setIsLoading(true);

    axios
      .delete(`/api/groups/${group.id}`)
      .then(() => {
        toast.success("This classroom has been successfully deleted!");
        router.replace("/classrooms");
      })
      .catch((e) => {
        console.error(e);
        toast.error("Something went wrong!");
      })
      .finally(() => setIsLoading(false));
  };

  useEffect(() => setSelectedUsers([]), [isAdding]);

  return (
    <>
      <Head>
        <title>{group.name} | 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>
      <ToastContainer />
      {user && (
        <>
          <section className="flex flex-col gap-0">
            <div className="flex items-center justify-between">
              <div className="flex flex-col gap-3">
                <div className="flex items-center gap-2">
                  <Link
                    href="/classrooms"
                    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">{group.name}</h2>
                </div>

                {!isAdding && (
                  <div className="flex items-center gap-2">
                    <button
                      onClick={renameGroup}
                      disabled={isLoading || !canRenameClassroom}
                      className="flex items-center gap-1 px-2 py-2 border rounded-full hover:bg-neutral-100 disabled:hover:bg-transparent disabled:opacity-50 disabled:cursor-not-allowed cursor-pointer transition ease-in-out duration-300"
                    >
                      <BsTag />
                      <span className="text-xs">Rename Classroom</span>
                    </button>
                    <button
                      onClick={deleteGroup}
                      disabled={isLoading || !canDeleteClassroom}
                      className="flex items-center gap-1 px-2 py-2 border border-mti-rose rounded-full bg-mti-rose-light text-white hover:bg-mti-rose-dark disabled:hover:bg-mti-rose-light disabled:opacity-50 disabled:cursor-not-allowed cursor-pointer transition ease-in-out duration-300"
                    >
                      <BsTrash />
                      <span className="text-xs">Delete Classroom</span>
                    </button>
                  </div>
                )}
              </div>
              <div className="flex flex-col gap-2">
                <span className="flex items-center gap-2">
                  <BsBuilding className="text-xl" /> {entity.label}
                </span>
                <span className="flex items-center gap-2">
                  <BsFillPersonVcardFill className="text-xl" />{" "}
                  {getUserName(group.admin)}
                </span>
              </div>
            </div>
            <Divider />
            <div className="flex items-center justify-between mb-4">
              <span className="font-semibold text-xl">Participants</span>
              {!isAdding && (
                <div className="flex items-center gap-2">
                  <button
                    onClick={() => setIsAdding(true)}
                    disabled={isLoading || !canAddParticipants}
                    className="flex items-center gap-1 px-2 py-2 border rounded-full hover:bg-neutral-100 disabled:hover:bg-transparent disabled:opacity-50 disabled:cursor-not-allowed cursor-pointer transition ease-in-out duration-300"
                  >
                    <BsPlus />
                    <span className="text-xs">Add Participants</span>
                  </button>
                  <button
                    onClick={removeParticipants}
                    disabled={
                      selectedUsers.length === 0 ||
                      isLoading ||
                      !canRemoveParticipants
                    }
                    className="flex items-center gap-1 px-2 py-2 border border-mti-rose rounded-full bg-mti-rose-light text-white hover:bg-mti-rose-dark disabled:hover:bg-mti-rose-light disabled:opacity-50 disabled:cursor-not-allowed cursor-pointer transition ease-in-out duration-300"
                  >
                    <BsTrash />
                    <span className="text-xs">Remove Participants</span>
                  </button>
                </div>
              )}
              {isAdding && (
                <div className="flex items-center gap-2">
                  <button
                    onClick={() => setIsAdding(false)}
                    disabled={isLoading}
                    className="flex items-center gap-1 px-2 py-2 border rounded-full border-mti-rose bg-mti-rose-light text-white hover:bg-mti-rose-dark disabled:hover:bg-mti-rose-light disabled:opacity-50 disabled:cursor-not-allowed cursor-pointer transition ease-in-out duration-300"
                  >
                    <BsX />
                    <span className="text-xs">Discard Selection</span>
                  </button>
                  <button
                    onClick={addParticipants}
                    disabled={
                      selectedUsers.length === 0 ||
                      isLoading ||
                      !canAddParticipants
                    }
                    className="flex items-center gap-1 px-2 py-2 border rounded-full border-mti-green bg-mti-green-light text-white hover:bg-mti-green-dark disabled:hover:bg-mti-green-light disabled:opacity-50 disabled:cursor-not-allowed cursor-pointer transition ease-in-out duration-300"
                  >
                    <BsPlus />
                    <span className="text-xs">Add Participants</span>
                  </button>
                </div>
              )}
            </div>
            <div className="w-full flex items-center gap-4">
              {renderSearch()}
              {renderMinimal()}
            </div>
            <div className="flex items-center gap-2 mt-4">
              {["student", "teacher", "corporate"].map((type) => (
                <button
                  key={type}
                  onClick={() => {
                    const typeUsers = mapBy(
                      filterBy(
                        isAdding ? nonParticipantUsers : group.participants,
                        "type",
                        type
                      ),
                      "id"
                    );
                    if (typeUsers.every((u) => selectedUsers.includes(u))) {
                      setSelectedUsers((prev) =>
                        prev.filter((a) => !typeUsers.includes(a))
                      );
                    } else {
                      setSelectedUsers((prev) => [
                        ...prev.filter((a) => !typeUsers.includes(a)),
                        ...typeUsers,
                      ]);
                    }
                  }}
                  disabled={
                    filterBy(
                      isAdding ? nonParticipantUsers : group.participants,
                      "type",
                      type
                    ).length === 0
                  }
                  className={clsx(
                    "bg-mti-purple-ultralight text-mti-purple px-4 py-2 rounded-full hover:text-white hover:bg-mti-purple-light",
                    "transition duration-300 ease-in-out",
                    "disabled:grayscale disabled:hover:bg-mti-purple-ultralight disabled:hover:text-mti-purple disabled:cursor-not-allowed",
                    filterBy(
                      isAdding ? nonParticipantUsers : group.participants,
                      "type",
                      type
                    ).length > 0 &&
                      filterBy(
                        isAdding ? nonParticipantUsers : group.participants,
                        "type",
                        type
                      ).every((u) => selectedUsers.includes(u.id)) &&
                      "!bg-mti-purple-light !text-white"
                  )}
                >
                  {capitalize(type)}
                </button>
              ))}
            </div>
          </section>

          <section className="w-full h-full grid grid-cols-1 md:grid-cols-2 lg:grid-cols-4 gap-4">
            {items.map((u) => (
              <button
                onClick={() => toggleUser(u)}
                disabled={
                  isAdding ? !canAddParticipants : !canRemoveParticipants
                }
                key={u.id}
                className={clsx(
                  "p-4 pr-6 h-48 relative border rounded-xl flex flex-col gap-3 justify-between text-left cursor-pointer",
                  "hover:border-mti-purple transition ease-in-out duration-300",
                  selectedUsers.includes(u.id) && "border-mti-purple"
                )}
              >
                <div className="flex items-center gap-2">
                  <div className="min-w-[3rem] min-h-[3rem] w-12 h-12 border flex items-center justify-center overflow-hidden rounded-full">
                    <img src={u.profilePicture} alt={u.name} />
                  </div>
                  <div className="flex flex-col">
                    <span className="font-semibold">{getUserName(u)}</span>
                    <span className="opacity-80 text-sm">
                      {USER_TYPE_LABELS[u.type]}
                    </span>
                  </div>
                </div>

                <div className="flex flex-col gap-1">
                  <span className="flex items-center gap-2">
                    <Tooltip tooltip="E-mail address">
                      <BsEnvelopeFill />
                    </Tooltip>
                    {u.email}
                  </span>
                  <span className="flex items-center gap-2">
                    <Tooltip tooltip="Expiration Date">
                      <BsStopwatchFill />
                    </Tooltip>
                    {u.subscriptionExpirationDate
                      ? moment(u.subscriptionExpirationDate).format(
                          "DD/MM/YYYY"
                        )
                      : "Unlimited"}
                  </span>
                  <span className="flex items-center gap-2">
                    <Tooltip tooltip="Last Login">
                      <BsClockFill />
                    </Tooltip>
                    {u.lastLogin
                      ? moment(u.lastLogin).format("DD/MM/YYYY - HH:mm")
                      : "N/A"}
                  </span>
                </div>
              </button>
            ))}
          </section>
        </>
      )}
    </>
  );
}