import {Fragment} from 'react';
import styled from '@emotion/styled';
import {Location} from 'history';
import isEmpty from 'lodash/isEmpty';
import uniq from 'lodash/uniq';

import {
  addErrorMessage,
  addMessage,
  addSuccessMessage,
} from 'sentry/actionCreators/indicator';
import Alert from 'sentry/components/alert';
import * as Layout from 'sentry/components/layouts/thirds';
import Link from 'sentry/components/links/link';
import LoadingError from 'sentry/components/loadingError';
import PageFiltersContainer from 'sentry/components/organizations/pageFilters/container';
import Pagination from 'sentry/components/pagination';
import PanelTable from 'sentry/components/panels/panelTable';
import SentryDocumentTitle from 'sentry/components/sentryDocumentTitle';
import {IconArrow, IconWarning} from 'sentry/icons';
import {t, tct} from 'sentry/locale';
import {space} from 'sentry/styles/space';
import {Project} from 'sentry/types';
import {defined} from 'sentry/utils';
import {VisuallyCompleteWithData} from 'sentry/utils/performanceForSentry';
import Projects from 'sentry/utils/projects';
import {
  ApiQueryKey,
  setApiQueryData,
  useApiQuery,
  useQueryClient,
} from 'sentry/utils/queryClient';
import useRouteAnalyticsEventNames from 'sentry/utils/routeAnalytics/useRouteAnalyticsEventNames';
import useRouteAnalyticsParams from 'sentry/utils/routeAnalytics/useRouteAnalyticsParams';
import useApi from 'sentry/utils/useApi';
import {useLocation} from 'sentry/utils/useLocation';
import useOrganization from 'sentry/utils/useOrganization';
import useRouter from 'sentry/utils/useRouter';
import {
  hasMigrationFeatureFlag,
  ruleNeedsMigration,
  useOrgNeedsMigration,
} from 'sentry/views/alerts/utils/migrationUi';

import FilterBar from '../../filterBar';
import {AlertRuleType, CombinedMetricIssueAlerts} from '../../types';
import {
  DatasetOption,
  datasetToQueryParam,
  getQueryDataset,
  getTeamParams,
  isIssueAlert,
} from '../../utils';
import AlertHeader from '../header';

import RuleListRow from './row';

type SortField = 'date_added' | 'name' | ['incident_status', 'date_triggered'];
const defaultSort: SortField = ['incident_status', 'date_triggered'];

function getAlertListQueryKey(orgSlug: string, query: Location['query']): ApiQueryKey {
  const queryParams = {...query};
  queryParams.expand = ['latestIncident', 'lastTriggered'];
  queryParams.team = getTeamParams(queryParams.team!);
  queryParams.dataset = datasetToQueryParam[getQueryDataset(queryParams.dataset!)];

  if (!queryParams.sort) {
    queryParams.sort = defaultSort;
  }

  return [`/organizations/${orgSlug}/combined-rules/`, {query: queryParams}];
}

function AlertRulesList() {
  const location = useLocation();
  const router = useRouter();
  const api = useApi();
  const queryClient = useQueryClient();
  const organization = useOrganization();

  useRouteAnalyticsEventNames('alert_rules.viewed', 'Alert Rules: Viewed');
  useRouteAnalyticsParams({
    sort: Array.isArray(location.query.sort)
      ? location.query.sort.join(',')
      : location.query.sort,
  });

  const {
    data: ruleListResponse = [],
    refetch,
    getResponseHeader,
    isLoading,
    isError,
  } = useApiQuery<Array<CombinedMetricIssueAlerts | null>>(
    getAlertListQueryKey(organization.slug, location.query),
    {
      staleTime: 0,
    }
  );
  const hasMigrationUIFeatureFlag = hasMigrationFeatureFlag(organization);
  const showMigrationUI = useOrgNeedsMigration();

  const handleChangeFilter = (activeFilters: string[]) => {
    const {cursor: _cursor, page: _page, ...currentQuery} = location.query;
    router.push({
      pathname: location.pathname,
      query: {
        ...currentQuery,
        team: activeFilters.length > 0 ? activeFilters : '',
      },
    });
  };

  const handleChangeSearch = (name: string) => {
    const {cursor: _cursor, page: _page, ...currentQuery} = location.query;
    router.push({
      pathname: location.pathname,
      query: {
        ...currentQuery,
        name,
      },
    });
  };

  const handleChangeDataset = (value: DatasetOption): void => {
    const {cursor: _cursor, page: _page, ...currentQuery} = location.query;
    router.push({
      pathname: location.pathname,
      query: {
        ...currentQuery,
        dataset: value === DatasetOption.ALL ? undefined : value,
      },
    });
  };

  const handleOwnerChange = (
    projectId: string,
    rule: CombinedMetricIssueAlerts,
    ownerValue: string
  ) => {
    const endpoint =
      rule.type === 'alert_rule'
        ? `/organizations/${organization.slug}/alert-rules/${rule.id}`
        : `/projects/${organization.slug}/${projectId}/rules/${rule.id}/`;
    const updatedRule = {...rule, owner: ownerValue};

    api.request(endpoint, {
      method: 'PUT',
      data: updatedRule,
      success: () => {
        addMessage(t('Updated alert rule'), 'success');
      },
      error: () => {
        addMessage(t('Unable to save change'), 'error');
      },
    });
  };

  const handleDeleteRule = async (projectId: string, rule: CombinedMetricIssueAlerts) => {
    try {
      await api.requestPromise(
        isIssueAlert(rule)
          ? `/projects/${organization.slug}/${projectId}/rules/${rule.id}/`
          : `/organizations/${organization.slug}/alert-rules/${rule.id}/`,
        {
          method: 'DELETE',
        }
      );
      setApiQueryData<Array<CombinedMetricIssueAlerts | null>>(
        queryClient,
        getAlertListQueryKey(organization.slug, location.query),
        data => data?.filter(r => r?.id !== rule.id && r?.type !== rule.type)
      );
      refetch();
      addSuccessMessage(t('Deleted rule'));
    } catch (_err) {
      addErrorMessage(t('Error deleting rule'));
    }
  };

  const hasEditAccess = organization.access.includes('alerts:write');

  const ruleList = ruleListResponse.filter(defined);
  const projectsFromResults = uniq(ruleList.flatMap(({projects}) => projects));
  const ruleListPageLinks = getResponseHeader?.('Link');

  const sort: {asc: boolean; field: SortField} = {
    asc: location.query.asc === '1',
    field: (location.query.sort as SortField) || defaultSort,
  };
  const {cursor: _cursor, page: _page, ...currentQuery} = location.query;
  const isAlertRuleSort =
    sort.field.includes('incident_status') || sort.field.includes('date_triggered');
  const sortArrow = (
    <IconArrow color="gray300" size="xs" direction={sort.asc ? 'up' : 'down'} />
  );

  const rulesWithMigrationWarnings = new Set(
    ruleList.filter(rule => hasMigrationUIFeatureFlag && ruleNeedsMigration(rule))
  );

  return (
    <Fragment>
      <SentryDocumentTitle title={t('Alerts')} orgSlug={organization.slug} />

      <PageFiltersContainer>
        <AlertHeader router={router} activeTab="rules" />
        <Layout.Body>
          <Layout.Main fullWidth>
            {showMigrationUI ? (
              <Alert showIcon type="warning">
                {tct(
                  'Our performance alerts just got a lot more accurate, which is why we recommend you review the thresholds of all rules marked with a “[warningIcon]“',
                  {warningIcon: <StyledIconWarning />}
                )}
              </Alert>
            ) : null}
            <FilterBar
              location={location}
              showMigrationWarning={showMigrationUI}
              onChangeDataset={handleChangeDataset}
              onChangeFilter={handleChangeFilter}
              onChangeSearch={handleChangeSearch}
            />
            <StyledPanelTable
              isLoading={isLoading}
              isEmpty={ruleList.length === 0 && !isError}
              emptyMessage={t('No alert rules found for the current query.')}
              headers={[
                <StyledSortLink
                  key="name"
                  role="columnheader"
                  aria-sort={
                    sort.field !== 'name' ? 'none' : sort.asc ? 'ascending' : 'descending'
                  }
                  to={{
                    pathname: location.pathname,
                    query: {
                      ...currentQuery,
                      // sort by name should start by ascending on first click
                      asc: sort.field === 'name' && sort.asc ? undefined : '1',
                      sort: 'name',
                    },
                  }}
                >
                  {t('Alert Rule')} {sort.field === 'name' ? sortArrow : null}
                </StyledSortLink>,
                <StyledSortLink
                  key="status"
                  role="columnheader"
                  aria-sort={
                    !isAlertRuleSort ? 'none' : sort.asc ? 'ascending' : 'descending'
                  }
                  to={{
                    pathname: location.pathname,
                    query: {
                      ...currentQuery,
                      asc: isAlertRuleSort && !sort.asc ? '1' : undefined,
                      sort: ['incident_status', 'date_triggered'],
                    },
                  }}
                >
                  {t('Status')} {isAlertRuleSort ? sortArrow : null}
                </StyledSortLink>,
                t('Project'),
                t('Team'),
                t('Actions'),
              ]}
            >
              {isError ? (
                <StyledLoadingError
                  message={t('There was an error loading alerts.')}
                  onRetry={refetch}
                />
              ) : null}
              <VisuallyCompleteWithData id="AlertRules-Body" hasData={!isEmpty(ruleList)}>
                <Projects orgId={organization.slug} slugs={projectsFromResults}>
                  {({initiallyLoaded, projects}) =>
                    ruleList.map(rule => (
                      <RuleListRow
                        // Metric and issue alerts can have the same id
                        key={`${
                          isIssueAlert(rule) ? AlertRuleType.METRIC : AlertRuleType.ISSUE
                        }-${rule.id}`}
                        showMigrationWarning={rulesWithMigrationWarnings.has(rule)}
                        listHasMigrationWarnings={rulesWithMigrationWarnings.size > 0}
                        projectsLoaded={initiallyLoaded}
                        projects={projects as Project[]}
                        rule={rule}
                        orgId={organization.slug}
                        onOwnerChange={handleOwnerChange}
                        onDelete={handleDeleteRule}
                        hasEditAccess={hasEditAccess}
                      />
                    ))
                  }
                </Projects>
              </VisuallyCompleteWithData>
            </StyledPanelTable>
            <Pagination
              pageLinks={ruleListPageLinks}
              onCursor={(cursor, path, _direction) => {
                let team = currentQuery.team;
                // Keep team parameter, but empty to remove parameters
                if (!team || team.length === 0) {
                  team = '';
                }

                router.push({
                  pathname: path,
                  query: {...currentQuery, team, cursor},
                });
              }}
            />
          </Layout.Main>
        </Layout.Body>
      </PageFiltersContainer>
    </Fragment>
  );
}

export default AlertRulesList;

const StyledLoadingError = styled(LoadingError)`
  grid-column: 1 / -1;
  margin-bottom: ${space(4)};
  border-radius: 0;
  border-width: 1px 0;
`;

const StyledSortLink = styled(Link)`
  color: inherit;
  display: flex;
  align-items: center;
  gap: ${space(0.5)};

  :hover {
    color: inherit;
  }
`;

const StyledPanelTable = styled(PanelTable)`
  @media (min-width: ${p => p.theme.breakpoints.small}) {
    overflow: initial;
  }

  grid-template-columns: minmax(250px, 4fr) auto auto 60px auto;
  white-space: nowrap;
  font-size: ${p => p.theme.fontSizeMedium};
`;

const StyledIconWarning = styled(IconWarning)`
  vertical-align: middle;
  color: ${p => p.theme.yellow400};
`;