import { createRef, useCallback, useEffect, useState } from "react";
import { User } from "../network/models";
import { network } from "../network/network";
import showToast from "../components/toast";
import Loading from "../components/loading";
import { MdMoreHoriz, MdSearch } from "react-icons/md";
import Pagination from "../components/pagination";
import showPopup, { PopupMenuItem } from "../components/popup";
import { useTranslation } from "../utils/i18n";
import { app } from "../app";
import { ErrorAlert } from "../components/alert";

export default function UserView() {
  const { t } = useTranslation();
  const [searchKeyword, setSearchKeyword] = useState("");

  const [page, setPage] = useState(1);

  const [totalPages, setTotalPages] = useState(0);

  if (!app.user) {
    return (
      <ErrorAlert
        className={"m-4"}
        message={t("You are not logged in. Please log in to access this page.")}
      />
    );
  }

  if (!app.user?.is_admin) {
    return (
      <ErrorAlert
        className={"m-4"}
        message={t("You are not authorized to access this page.")}
      />
    );
  }

  return (
    <>
      <div className={"flex flex-row justify-between items-center mx-4 my-4"}>
        <form
          className={"flex flex-row gap-2 items-center w-64"}
          onSubmit={(e) => {
            e.preventDefault();
            setPage(0);
            const input = e.currentTarget.querySelector(
              "input[type=search]",
            ) as HTMLInputElement;
            setSearchKeyword(input.value);
          }}
        >
          <label className="input">
            <MdSearch size={20} className="opacity-50" />
            <input
              type="search"
              className="grow"
              placeholder={t("Search")}
              id="search"
            />
          </label>
        </form>
      </div>
      <UserTable
        page={page}
        searchKeyword={searchKeyword}
        key={`${page}&${searchKeyword}`}
        totalPagesCallback={setTotalPages}
      />
      <div className={"flex flex-row justify-center items-center my-4"}>
        {totalPages ? (
          <Pagination page={page} setPage={setPage} totalPages={totalPages} />
        ) : null}
      </div>
    </>
  );
}

function UserTable({
  page,
  searchKeyword,
  totalPagesCallback,
}: {
  page: number;
  searchKeyword: string;
  totalPagesCallback: (totalPages: number) => void;
}) {
  const { t } = useTranslation();
  const [users, setUsers] = useState<User[] | null>(null);

  const fetchUsers = useCallback(() => {
    if (searchKeyword) {
      network.searchUsers(searchKeyword, page).then((response) => {
        if (response.success) {
          setUsers(response.data!);
          totalPagesCallback(response.totalPages!);
        } else {
          showToast({
            type: "error",
            message: response.message,
          });
        }
      });
    } else {
      network.listUsers(page).then((response) => {
        if (response.success) {
          setUsers(response.data!);
          totalPagesCallback(response.totalPages!);
        } else {
          showToast({
            type: "error",
            message: response.message,
          });
        }
      });
    }
  }, [page, searchKeyword, totalPagesCallback]);

  useEffect(() => {
    fetchUsers();
  }, [fetchUsers]);

  const handleChanged = useCallback(async () => {
    setUsers(null);
    fetchUsers();
  }, [fetchUsers]);

  if (users === null) {
    return <Loading />;
  }

  return (
    <div
      className={`rounded-box border border-base-content/10 bg-base-100 mx-4 mb-4 overflow-x-auto`}
    >
      <table className={"table"}>
        <thead>
          <tr>
            <td>{t("Username")}</td>
            <td>{t("Created At")}</td>
            <td>{t("Admin")}</td>
            <td>{t("Can Upload")}</td>
            <td>{t("Actions")}</td>
          </tr>
        </thead>
        <tbody>
          {users.map((u) => {
            return <UserRow key={u.id} user={u} onChanged={handleChanged} />;
          })}
        </tbody>
      </table>
    </div>
  );
}

function UserRow({ user, onChanged }: { user: User; onChanged: () => void }) {
  const { t } = useTranslation();
  const [isLoading, setIsLoading] = useState(false);

  const buttonRef = createRef<HTMLButtonElement>();

  const handleDelete = async () => {
    if (isLoading) {
      return;
    }
    setIsLoading(true);
    const res = await network.deleteUser(user.id);
    if (res.success) {
      showToast({
        type: "success",
        message: t("User deleted successfully"),
      });
      onChanged();
    } else {
      showToast({
        type: "error",
        message: res.message,
      });
    }
    setIsLoading(false);
  };

  const handleSetAdmin = async () => {
    if (isLoading) {
      return;
    }
    setIsLoading(true);
    const res = await network.setUserAdmin(user.id, true);
    if (res.success) {
      showToast({
        type: "success",
        message: t("User set as admin successfully"),
      });
      onChanged();
    } else {
      showToast({
        type: "error",
        message: res.message,
      });
    }
    setIsLoading(false);
  };

  const handleSetUser = async () => {
    if (isLoading) {
      return;
    }
    setIsLoading(true);
    const res = await network.setUserAdmin(user.id, false);
    if (res.success) {
      showToast({
        type: "success",
        message: t("User set as user successfully"),
      });
      onChanged();
    } else {
      showToast({
        type: "error",
        message: res.message,
      });
    }
    setIsLoading(false);
  };

  const handleSetUploadPermission = async () => {
    if (isLoading) {
      return;
    }
    setIsLoading(true);
    const res = await network.setUserUploadPermission(user.id, true);
    if (res.success) {
      showToast({
        type: "success",
        message: t("User set as upload permission successfully"),
      });
      onChanged();
    } else {
      showToast({
        type: "error",
        message: res.message,
      });
    }
    setIsLoading(false);
  };

  const handleRemoveUploadPermission = async () => {
    if (isLoading) {
      return;
    }
    setIsLoading(true);
    const res = await network.setUserUploadPermission(user.id, false);
    if (res.success) {
      showToast({
        type: "success",
        message: t("User removed upload permission successfully"),
      });
      onChanged();
    } else {
      showToast({
        type: "error",
        message: res.message,
      });
    }
    setIsLoading(false);
  };

  return (
    <tr key={user.id} className={"hover"}>
      <td>{user.username}</td>
      <td>{new Date(user.created_at).toLocaleDateString()}</td>
      <td>{user.is_admin ? t("Yes") : t("No")}</td>
      <td>{user.can_upload ? t("Yes") : t("No")}</td>
      <td>
        <div className="dropdown dropdown-bottom dropdown-end">
          <button
            ref={buttonRef}
            className="btn btn-square m-1"
            onClick={() => {
              showPopup(
                <ul className="menu bg-base-100 rounded-box z-1 w-64 p-2 shadow-sm">
                  <h4 className="text-sm font-bold px-3 py-1 text-primary">
                    {t("Actions")}
                  </h4>
                  <PopupMenuItem
                    onClick={() => {
                      const dialog = document.getElementById(
                        `delete_user_dialog_${user.id}`,
                      ) as HTMLDialogElement;
                      dialog.showModal();
                    }}
                  >
                    <a>{t("Delete")}</a>
                  </PopupMenuItem>
                  {user.is_admin ? (
                    <PopupMenuItem onClick={handleSetUser}>
                      <a>{t("Set as user")}</a>
                    </PopupMenuItem>
                  ) : (
                    <PopupMenuItem onClick={handleSetAdmin}>
                      <a>{t("Set as admin")}</a>
                    </PopupMenuItem>
                  )}
                  {app.user?.is_admin ? (
                    user.can_upload ? (
                      <PopupMenuItem onClick={handleRemoveUploadPermission}>
                        <a>{t("Remove upload permission")}</a>
                      </PopupMenuItem>
                    ) : (
                      <PopupMenuItem onClick={handleSetUploadPermission}>
                        <a>{t("Grant upload permission")}</a>
                      </PopupMenuItem>
                    )
                  ) : null}
                </ul>,
                buttonRef.current!,
              );
            }}
          >
            {isLoading ? (
              <span className="loading loading-spinner loading-sm"></span>
            ) : (
              <MdMoreHoriz size={20} className="opacity-50" />
            )}
          </button>
          <dialog id={`delete_user_dialog_${user.id}`} className="modal">
            <div className="modal-box">
              <h3 className="font-bold text-lg">{t("Delete User")}</h3>
              <p className="py-4">
                {t("Are you sure you want to delete user")}{" "}
                <span className="font-bold">{user.username}</span>?{" "}
                {t("This action cannot be undone.")}
              </p>
              <div className="modal-action">
                <form method="dialog">
                  <button className="btn btn-ghost">{t("Close")}</button>
                  <button className="btn btn-error" onClick={handleDelete}>
                    {t("Delete")}
                  </button>
                </form>
              </div>
            </div>
          </dialog>
        </div>
      </td>
    </tr>
  );
}