import React from 'react';
import { defineMessages, FormattedMessage, useIntl } from 'react-intl';
import { Link } from 'react-router-dom';

import { fetchEventIcs } from 'soapbox/actions/events';
import { openModal } from 'soapbox/actions/modals';
import { deleteStatusModal, toggleStatusSensitivityModal } from 'soapbox/actions/moderation';
import Icon from 'soapbox/components/icon';
import StillImage from 'soapbox/components/still_image';
import { Button, HStack, IconButton, Menu, MenuButton, MenuDivider, MenuItem, MenuLink, MenuList, Stack, Text } from 'soapbox/components/ui';
import SvgIcon from 'soapbox/components/ui/icon/svg-icon';
import VerificationBadge from 'soapbox/components/verification_badge';
import { useAppDispatch, useOwnAccount } from 'soapbox/hooks';
import { download } from 'soapbox/utils/download';
import { shortNumberFormat } from 'soapbox/utils/numbers';

import PlaceholderEventHeader from '../../placeholder/components/placeholder_event_header';
import EventActionButton from '../components/event-action-button';
import EventDate from '../components/event-date';

import type { Menu as MenuType } from 'soapbox/components/dropdown_menu';
import type { Account as AccountEntity, Status as StatusEntity } from 'soapbox/types/entities';

const messages = defineMessages({
  bannerHeader: { id: 'event.banner', defaultMessage: 'Event banner' },
  exportIcs: { id: 'event.export_ics', defaultMessage: 'Export to your calendar' },
  copy: { id: 'event.copy', defaultMessage: 'Copy link to event' },
  bookmark: { id: 'status.bookmark', defaultMessage: 'Bookmark' },
  unbookmark: { id: 'status.unbookmark', defaultMessage: 'Remove bookmark' },
  adminAccount: { id: 'status.admin_account', defaultMessage: 'Moderate @{name}' },
  adminStatus: { id: 'status.admin_status', defaultMessage: 'Open this post in the moderation interface' },
  markStatusSensitive: { id: 'admin.statuses.actions.mark_status_sensitive', defaultMessage: 'Mark post sensitive' },
  markStatusNotSensitive: { id: 'admin.statuses.actions.mark_status_not_sensitive', defaultMessage: 'Mark post not sensitive' },
  deleteStatus: { id: 'admin.statuses.actions.delete_status', defaultMessage: 'Delete post' },
});

interface IEventHeader {
  status?: StatusEntity,
}

const EventHeader: React.FC<IEventHeader> = ({ status }) => {
  const intl = useIntl();
  const dispatch = useAppDispatch();

  const ownAccount = useOwnAccount();
  const isStaff = ownAccount ? ownAccount.staff : false;
  const isAdmin = ownAccount ? ownAccount.admin : false;

  if (!status || !status.event) {
    return (
      <>
        <div className='-mt-4 -mx-4'>
          <div className='relative h-32 w-full lg:h-48 md:rounded-t-xl bg-gray-200 dark:bg-gray-900/50' />
        </div>

        <PlaceholderEventHeader />
      </>
    );
  }

  const account = status.account as AccountEntity;
  const event = status.event;
  const banner = status.media_attachments?.find(({ description }) => description === 'Banner');

  const handleHeaderClick: React.MouseEventHandler<HTMLAnchorElement> = (e) => {
    e.stopPropagation();

    const index = status.media_attachments!.findIndex(({ description }) => description === 'Banner');
    dispatch(openModal('MEDIA', { media: status.media_attachments, index }));
  };

  const handleExportClick = () => {
    dispatch(fetchEventIcs(status.id)).then((response) => {
      download(response, 'calendar.ics');
    }).catch(() => {});
  };

  const handleCopy = () => {
    const { uri }  = status;
    const textarea = document.createElement('textarea');

    textarea.textContent    = uri;
    textarea.style.position = 'fixed';

    document.body.appendChild(textarea);

    try {
      textarea.select();
      document.execCommand('copy');
    } catch {
      // Do nothing
    } finally {
      document.body.removeChild(textarea);
    }
  };

  const handleModerate = () => {
    dispatch(openModal('ACCOUNT_MODERATION', { accountId: account.id }));
  };

  const handleModerateStatus = () => {
    window.open(`/pleroma/admin/#/statuses/${status.id}/`, '_blank');
  };

  const handleToggleStatusSensitivity = () => {
    dispatch(toggleStatusSensitivityModal(intl, status.id, status.sensitive));
  };

  const handleDeleteStatus = () => {
    dispatch(deleteStatusModal(intl, status.id));
  };

  const menu: MenuType = [
    {
      text: intl.formatMessage(messages.exportIcs),
      action: handleExportClick,
      icon: require('@tabler/icons/calendar-plus.svg'),
    },
    {
      text: intl.formatMessage(messages.copy),
      action: handleCopy,
      icon: require('@tabler/icons/link.svg'),
    },
  ];

  if (isStaff) {
    menu.push(null);

    menu.push({
      text: intl.formatMessage(messages.adminAccount, { name: account.username }),
      action: handleModerate,
      icon: require('@tabler/icons/gavel.svg'),
    });

    if (isAdmin) {
      menu.push({
        text: intl.formatMessage(messages.adminStatus),
        action: handleModerateStatus,
        icon: require('@tabler/icons/pencil.svg'),
      });
    }

    menu.push({
      text: intl.formatMessage(status.sensitive === false ? messages.markStatusSensitive : messages.markStatusNotSensitive),
      action: handleToggleStatusSensitivity,
      icon: require('@tabler/icons/alert-triangle.svg'),
    });

    if (account.id !== ownAccount?.id) {
      menu.push({
        text: intl.formatMessage(messages.deleteStatus),
        action: handleDeleteStatus,
        icon: require('@tabler/icons/trash.svg'),
        destructive: true,
      });
    }
  }

  const handleManageClick: React.MouseEventHandler = e => {
    e.stopPropagation();

    dispatch(openModal('MANAGE_EVENT', {
      statusId: status.id,
    }));
  };

  const handleParticipantsClick: React.MouseEventHandler = e => {
    e.stopPropagation();

    dispatch(openModal('EVENT_PARTICIPANTS', {
      statusId: status.id,
    }));
  };

  return (
    <>
      <div className='-mt-4 -mx-4'>
        <div className='relative h-32 w-full lg:h-48 md:rounded-t-xl bg-gray-200 dark:bg-gray-900/50'>
          {banner && (
            <a href={banner.url} onClick={handleHeaderClick} target='_blank'>
              <StillImage
                src={banner.url}
                alt={intl.formatMessage(messages.bannerHeader)}
                className='absolute inset-0 object-cover md:rounded-t-xl'
              />
            </a>
          )}
        </div>
      </div>
      <Stack space={2}>
        <HStack className='w-full' alignItems='start' space={2}>
          <Text className='flex-grow' size='lg' weight='bold'>{event.name}</Text>
          <Menu>
            <MenuButton
              as={IconButton}
              src={require('@tabler/icons/dots.svg')}
              theme='outlined'
              className='px-2 h-[30px]'
              iconClassName='w-4 h-4'
              children={null}
            />

            <MenuList>
              {menu.map((menuItem, idx) => {
                if (typeof menuItem?.text === 'undefined') {
                  return <MenuDivider key={idx} />;
                } else {
                  const Comp = (menuItem.action ? MenuItem : MenuLink) as any;
                  const itemProps = menuItem.action ? { onSelect: menuItem.action } : { to: menuItem.to, as: Link, target: menuItem.newTab ? '_blank' : '_self' };

                  return (
                    <Comp key={idx} {...itemProps} className='group'>
                      <div className='flex items-center'>
                        {menuItem.icon && (
                          <SvgIcon src={menuItem.icon} className='mr-3 h-5 w-5 text-gray-400 flex-none group-hover:text-gray-500' />
                        )}

                        <div className='truncate'>{menuItem.text}</div>
                      </div>
                    </Comp>
                  );
                }
              })}
            </MenuList>
          </Menu>
          {account.id === ownAccount?.id ? (
            <Button
              size='sm'
              theme='secondary'
              onClick={handleManageClick}
              to={`/@${account.acct}/events/${status.id}`}
            >
              <FormattedMessage id='event.manage' defaultMessage='Manage' />
            </Button>
          ) : <EventActionButton status={status} />}
        </HStack>

        <Stack space={1}>
          <HStack alignItems='center' space={2}>
            <Icon src={require('@tabler/icons/flag-3.svg')} />
            <span>
              <FormattedMessage
                id='event.organized_by'
                defaultMessage='Organized by {name}'
                values={{
                  name: (
                    <Link className='mention' to={`/@${account.acct}`}>
                      <span dangerouslySetInnerHTML={{ __html: account.display_name_html }} />
                      {account.verified && <VerificationBadge />}
                    </Link>
                  ),
                }}
              />
            </span>
          </HStack>

          <HStack alignItems='center' space={2}>
            <Icon src={require('@tabler/icons/users.svg')} />
            <a href='#' className='hover:underline' onClick={handleParticipantsClick}>
              <span>
                <FormattedMessage
                  id='event.participants'
                  defaultMessage='{count} {rawCount, plural, one {person} other {people}} going'
                  values={{
                    rawCount: event.participants_count || 0,
                    count: shortNumberFormat(event.participants_count || 0),
                  }}
                />
              </span>
            </a>
          </HStack>

          <EventDate status={status} />

          {event.location && (
            <HStack alignItems='center' space={2}>
              <Icon src={require('@tabler/icons/map-pin.svg')} />
              <span>
                {event.location.get('name')}
              </span>
            </HStack>
          )}
        </Stack>
      </Stack>
    </>
  );
};

export default EventHeader;