import { css } from '@emotion/css';
import React from 'react';
import useAsync from 'react-use/lib/useAsync';

import { QueryEditorProps, SelectableValue } from '@grafana/data';
import { config } from '@grafana/runtime';
import {
  Badge,
  FileDropzone,
  InlineField,
  InlineFieldRow,
  InlineLabel,
  QueryField,
  RadioButtonGroup,
  Themeable2,
  withTheme2,
} from '@grafana/ui';

import { LokiQueryField } from '../../loki/components/LokiQueryField';
import { LokiDatasource } from '../../loki/datasource';
import { LokiQuery } from '../../loki/types';
import { TempoDatasource, TempoQuery, TempoQueryType } from '../datasource';

import NativeSearch from './NativeSearch';
import { ServiceGraphSection } from './ServiceGraphSection';
import { getDS } from './utils';

interface Props extends QueryEditorProps<TempoDatasource, TempoQuery>, Themeable2 {}

const DEFAULT_QUERY_TYPE: TempoQueryType = 'traceId';

class TempoQueryFieldComponent extends React.PureComponent<Props> {
  constructor(props: Props) {
    super(props);
  }

  async componentDidMount() {
    // Set initial query type to ensure traceID field appears
    if (!this.props.query.queryType) {
      this.props.onChange({
        ...this.props.query,
        queryType: DEFAULT_QUERY_TYPE,
      });
    }
  }

  onChangeLinkedQuery = (value: LokiQuery) => {
    const { query, onChange } = this.props;
    onChange({
      ...query,
      linkedQuery: { ...value, refId: 'linked' },
    });
  };

  onRunLinkedQuery = () => {
    this.props.onRunQuery();
  };

  onClearResults = () => {
    // Run clear query to clear results
    const { onChange, query, onRunQuery } = this.props;
    onChange({
      ...query,
      queryType: 'clear',
    });
    onRunQuery();
  };

  render() {
    const { query, onChange, datasource } = this.props;

    const logsDatasourceUid = datasource.getLokiSearchDS();

    const graphDatasourceUid = datasource.serviceMap?.datasourceUid;

    const queryTypeOptions: Array<SelectableValue<TempoQueryType>> = [
      { value: 'traceId', label: 'TraceID' },
      { value: 'upload', label: 'JSON file' },
    ];

    if (config.featureToggles.tempoServiceGraph) {
      queryTypeOptions.push({ value: 'serviceMap', label: 'Service Graph' });
    }

    if (config.featureToggles.tempoSearch && !datasource?.search?.hide) {
      queryTypeOptions.unshift({ value: 'nativeSearch', label: 'Search - Beta' });
    }

    if (logsDatasourceUid) {
      if (!config.featureToggles.tempoSearch) {
        // Place at beginning as Search if no native search
        queryTypeOptions.unshift({ value: 'search', label: 'Search' });
      } else {
        // Place at end as Loki Search if native search is enabled
        queryTypeOptions.push({ value: 'search', label: 'Loki Search' });
      }
    }

    return (
      <>
        <InlineFieldRow>
          <InlineField label="Query type">
            <RadioButtonGroup<TempoQueryType>
              options={queryTypeOptions}
              value={query.queryType}
              onChange={(v) => {
                this.onClearResults();

                onChange({
                  ...query,
                  queryType: v,
                });
              }}
              size="md"
            />
          </InlineField>
        </InlineFieldRow>
        {query.queryType === 'nativeSearch' && (
          <div style={{ maxWidth: '65ch' }}>
            <Badge icon="rocket" text="Beta" color="blue" />
            {config.featureToggles.tempoBackendSearch ? (
              <>&nbsp;Tempo search is currently in beta.</>
            ) : (
              <>
                &nbsp;Tempo search is currently in beta and is designed to return recent traces only. It ignores the
                time range picker. We are actively working on full backend search. Look for improvements in the near
                future!
              </>
            )}
          </div>
        )}
        {query.queryType === 'search' && (
          <SearchSection
            logsDatasourceUid={logsDatasourceUid}
            query={query}
            onRunQuery={this.onRunLinkedQuery}
            onChange={this.onChangeLinkedQuery}
          />
        )}
        {query.queryType === 'nativeSearch' && (
          <NativeSearch
            datasource={this.props.datasource}
            query={query}
            onChange={onChange}
            onBlur={this.props.onBlur}
            onRunQuery={this.props.onRunQuery}
          />
        )}
        {query.queryType === 'upload' && (
          <div className={css({ padding: this.props.theme.spacing(2) })}>
            <FileDropzone
              options={{ multiple: false }}
              onLoad={(result) => {
                this.props.datasource.uploadedJson = result;
                this.props.onRunQuery();
              }}
            />
          </div>
        )}
        {query.queryType === 'traceId' && (
          <InlineFieldRow>
            <InlineField label="Trace ID" labelWidth={14} grow>
              <QueryField
                query={query.query}
                onChange={(val) => {
                  onChange({
                    ...query,
                    query: val,
                    queryType: 'traceId',
                    linkedQuery: undefined,
                  });
                }}
                onBlur={this.props.onBlur}
                onRunQuery={this.props.onRunQuery}
                placeholder={'Enter a Trace ID (run with Shift+Enter)'}
                portalOrigin="tempo"
              />
            </InlineField>
          </InlineFieldRow>
        )}
        {query.queryType === 'serviceMap' && (
          <ServiceGraphSection graphDatasourceUid={graphDatasourceUid} query={query} onChange={onChange} />
        )}
      </>
    );
  }
}

interface SearchSectionProps {
  logsDatasourceUid?: string;
  onChange: (value: LokiQuery) => void;
  onRunQuery: () => void;
  query: TempoQuery;
}
function SearchSection({ logsDatasourceUid, onChange, onRunQuery, query }: SearchSectionProps) {
  const dsState = useAsync(() => getDS(logsDatasourceUid), [logsDatasourceUid]);
  if (dsState.loading) {
    return null;
  }

  const ds = dsState.value as LokiDatasource;

  if (ds) {
    return (
      <>
        <InlineLabel>Tempo uses {ds.name} to find traces.</InlineLabel>
        <LokiQueryField
          datasource={ds}
          onChange={onChange}
          onRunQuery={onRunQuery}
          query={query.linkedQuery ?? ({ refId: 'linked' } as any)}
          history={[]}
        />
      </>
    );
  }

  if (!logsDatasourceUid) {
    return <div className="text-warning">Please set up a Loki search datasource in the datasource settings.</div>;
  }

  if (logsDatasourceUid && !ds) {
    return (
      <div className="text-warning">
        Loki search datasource is configured but the data source no longer exists. Please configure existing data source
        to use the search.
      </div>
    );
  }

  return null;
}

export const TempoQueryField = withTheme2(TempoQueryFieldComponent);
