import styles from './UsersPage.module.scss';
import { useEffect, useRef, useState } from 'react';
import useSWR from 'swr';
import useUser from '../../lib/hooks/useUser';
import { PaginatedResponse } from '../../lib/types/paginated-response.interface';
import { UserListItem } from '../../lib/types/users.interfaces';
import { Container } from '../common/Container/Container';
import { Header } from '../common/Header/Header';
import avatar from '../../public/avatar.png';
import Image from 'next/image';
import { UPLOADS_URL } from '../../lib/constants';
import { Paginator } from '../common/Paginator/Paginator';
import { Dropdown } from '../common/Dropdown/Dropdown';
import toast from 'react-hot-toast';
import { publishJSON } from '../../lib/utils/swr-fetcher';
import { useForm } from '../../lib/hooks/useForm';
import { ModalProps } from '../../lib/types/modal.interface';
import { Button } from '../common/Button/Button';
import { FormControl } from '../common/Form/FormControl/FormControl';
import { FormWrapper } from '../common/Form/FormWrapper/FormWrapper';
import Modal from '../common/Modal/Modal/Modal';
import ModalBody from '../common/Modal/ModalBody/ModalBody';
import ModalFooter from '../common/Modal/ModalFooter/ModalFooter';
import ModalHeader from '../common/Modal/ModalHeader/ModalHeader';
import ModalService from '../common/Modal/services/ModalService';
import { Privilege } from '../../lib/types/privilege.interface';
import useHasPrivileges from '../../lib/hooks/useHasPrivileges';

function getSelectValues(selectElement: HTMLSelectElement) {
  const result = [];
  const options = selectElement && selectElement.options;

  for (let i = 0, iLen = options.length; i < iLen; i++) {
    const opt = options[i];

    if (opt.selected) {
      result.push(opt.value || opt.text);
    }
  }
  return result;
}

const PrivilegeEditor = ({
  user,
  onChange,
}: {
  user: UserListItem;
  onChange: (privvy: Privilege[]) => void;
}) => {
  const [userPrivvy, setUserPrivvy] = useState(user.privileges || []);
  const [selectionAvailable, setSelectionAvailable] = useState<string[]>([]);
  const [selectionExisting, setSelectionExisting] = useState<string[]>([]);
  const [availablePrivileges, setAvailablePrivileges] = useState<Privilege[]>(
    []
  );
  const { data } = useSWR<Privilege[]>('/api/admin/privileges');

  useEffect(() => {
    setAvailablePrivileges(
      (data || []).filter(
        ({ id }) => !(user.privileges || []).some((privvy) => privvy.id === id)
      )
    );
  }, [user, data, userPrivvy]);

  return (
    <>
      <div className={styles.privEditor}>
        <h3>Privileges</h3>
        <div className={styles.privInner}>
          <div className={styles.described}>
            <h4>Available</h4>
            <select
              multiple
              value={selectionAvailable}
              onChange={(e) => setSelectionAvailable(getSelectValues(e.target))}
            >
              {availablePrivileges.map(({ name, id }) => (
                <option value={id} key={id}>
                  {name}
                </option>
              ))}
            </select>
          </div>
          <div className={styles.privControls}>
            <Button
              type="button"
              disabled={!selectionAvailable.length}
              onClick={() => {
                // Add privileges
                const toAdd = availablePrivileges.filter(({ id }) =>
                  selectionAvailable.includes(id.toString())
                );
                setUserPrivvy([...(userPrivvy || []), ...toAdd]);
                setSelectionAvailable([]);
                onChange(userPrivvy);
              }}
            >
              &gt;&gt;
            </Button>
            <Button
              type="button"
              disabled={!selectionExisting.length}
              onClick={() => {
                // Remove privileges
                onChange(userPrivvy);
                setSelectionExisting([]);
                setUserPrivvy(
                  (userPrivvy || []).filter(
                    ({ id }) => !selectionExisting.includes(id.toString())
                  )
                );
              }}
            >
              &lt;&lt;
            </Button>
          </div>
          <div className={styles.described}>
            <h4>Current</h4>
            <select
              multiple
              value={selectionExisting}
              onChange={(e) => setSelectionExisting(getSelectValues(e.target))}
            >
              {(user.privileges || []).map(({ name, id }) => (
                <option value={id} key={id}>
                  {name}
                </option>
              ))}
            </select>
          </div>
        </div>
      </div>
    </>
  );
};

const EditUserModal = ({
  close,
  modalRef,
  privPriv,
  user,
  update,
}: ModalProps<{
  user: UserListItem;
  update: () => void;
  privPriv: boolean;
}>) => {
  const formRef = useRef<HTMLFormElement>(null);

  const { formData, handleInputChange, handleSubmit } = useForm<
    Partial<UserListItem>
  >(user, async () => {
    // Save privileges
    if (privPriv) {
      await toast.promise(
        publishJSON(`/api/admin/users/${user.id}/privileges`, 'PUT', {
          privileges: (user.privileges || []).map(({ id }) => id),
        }),
        {
          loading: 'Saving privileges...',
          success: 'Privileges saved!',
          error: 'Failed to save privileges.',
        }
      );
    }

    // Save user data
    toast
      .promise(publishJSON(`/api/admin/users/${user.id}`, 'PATCH', formData), {
        loading: 'Saving user...',
        success: 'User saved!',
        error: (err) => `Saving the user failed: ${err.message}`,
      })
      .then((data) => {
        if (data) {
          close(true);
          update();
        }
      });
    return false;
  });

  return (
    <Modal modalRef={modalRef}>
      <ModalHeader>
        <h3>Edit user details</h3>
      </ModalHeader>
      <ModalBody>
        <FormWrapper>
          <form ref={formRef} onSubmit={handleSubmit} autoComplete="off">
            <FormControl>
              <label htmlFor="display_name">Display name</label>
              <input
                id="display_name"
                type="text"
                name="display_name"
                value={formData.display_name}
                onChange={handleInputChange}
              />
            </FormControl>
            <FormControl>
              <label htmlFor="username">Username</label>
              <input
                id="username"
                type="text"
                name="username"
                value={formData.username}
                onChange={handleInputChange}
              />
            </FormControl>
            <FormControl>
              <label htmlFor="email">Email</label>
              <input
                id="email"
                name="email"
                type="email"
                value={formData.email}
                onChange={handleInputChange}
              />
            </FormControl>
            <FormControl inline={true}>
              <label htmlFor="activated">Activated</label>
              <input
                id="activated"
                name="activated"
                type="checkbox"
                checked={formData.activated}
                onChange={handleInputChange}
              />
            </FormControl>
            {privPriv && (
              <PrivilegeEditor
                user={user}
                onChange={(privileges: Privilege[]) =>
                  (formData.privileges = privileges)
                }
              ></PrivilegeEditor>
            )}
          </form>
        </FormWrapper>
      </ModalBody>
      <ModalFooter>
        <Button onClick={() => close(true)}>Cancel</Button>
        <Button onClick={() => handleSubmit()} variant="primary">
          Submit
        </Button>
      </ModalFooter>
    </Modal>
  );
};

const UserCard = ({
  user,
  update,
  privPriv,
}: {
  user: UserListItem;
  update: () => void;
  privPriv: boolean;
}) => (
  <div className={styles.userCard}>
    <div className={styles.pictureWrapper}>
      {user.picture ? (
        <Image
          src={`${UPLOADS_URL}/${user.picture.file}`}
          width={128}
          height={128}
          alt=""
        />
      ) : (
        <Image src={avatar} alt="" width={128} height={128} />
      )}
    </div>
    <div className={styles.userInfo}>
      <div className={styles.titleWrap}>
        <h2>
          {user.display_name}{' '}
          <span className={styles.username}>@{user.username}</span>
        </h2>
        <Dropdown opens="right">
          <button
            onClick={() =>
              ModalService.open(EditUserModal, { user, update, privPriv })
            }
          >
            Edit user
          </button>
          {!user.activated && (
            <button
              onClick={() => {
                toast.promise(
                  publishJSON(`/api/admin/users/${user.id}/activation`, 'POST'),
                  {
                    loading: 'Sending email...',
                    success: 'Email sent!',
                    error: 'Failed to send activation email.',
                  }
                );
              }}
            >
              Send activation email
            </button>
          )}
          {user.activated && (
            <button
              onClick={() =>
                toast.promise(
                  publishJSON(`/api/admin/users/${user.id}/password`, 'POST'),
                  {
                    loading: 'Sending email...',
                    success: 'Email sent!',
                    error: 'Failed to send password email.',
                  }
                )
              }
            >
              Send password email
            </button>
          )}
          {user.picture && (
            <button
              onClick={() =>
                toast
                  .promise(
                    publishJSON(`/api/admin/users/${user.id}/avatar`, 'DELETE'),
                    {
                      loading: 'Deleting avatar...',
                      success: 'Avatar deleted!',
                      error: 'Failed to delete user avatar.',
                    }
                  )
                  .then(update)
              }
            >
              Delete avatar
            </button>
          )}
        </Dropdown>
      </div>
      <dl>
        <dt>UUID</dt>
        <dd>{user.uuid}</dd>
        <dt>Email</dt>
        <dd>{user.email}</dd>
        {user.privileges?.length && (
          <>
            <dt>Privileges</dt>
            <dd>
              {user.privileges.map((privilege) => privilege.name).join(', ')}
            </dd>
          </>
        )}
        <dt>Activated</dt>
        <dd>{user.activated ? 'Yes' : <b>NOT ACTIVATED</b>}</dd>
        <dt>Registered</dt>
        <dd>{new Date(user.created_at).toDateString()}</dd>
      </dl>
    </div>
  </div>
);

const UserList = ({
  pageIndex,
  searchTerm,
  privPriv,
  setPage,
}: {
  pageIndex: number;
  searchTerm: string;
  privPriv: boolean;
  setPage: (page: number) => void;
}) => {
  const { data, mutate } = useSWR<PaginatedResponse<UserListItem>>(
    `/api/admin/users?page=${pageIndex}${searchTerm ? `&q=${searchTerm}` : ''}`
  );

  return data ? (
    <>
      {data?.list?.length && (
        <div className={styles.userList}>
          {data.list.map((user) => (
            <UserCard
              user={user}
              key={user.uuid}
              update={mutate}
              privPriv={privPriv}
            />
          ))}
          <Paginator setPage={setPage} pagination={data.pagination}></Paginator>
        </div>
      )}
    </>
  ) : (
    <span>Nothing found</span>
  );
};

export const UsersPage = () => {
  const { user } = useUser({ redirectTo: '/login' });
  const [pageIndex, setPageIndex] = useState(1);
  const [searchTerm, setSearchTerm] = useState('');
  const privPriv = useHasPrivileges(user, 'admin:user:privilege');

  return (
    <>
      <Header user={user}></Header>
      <Container>
        <h1>Users</h1>
        <UserList
          pageIndex={pageIndex}
          searchTerm={searchTerm}
          privPriv={privPriv}
          setPage={setPageIndex}
        />
      </Container>
    </>
  );
};