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

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

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

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

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

const DEFAULT_QUERY_TYPE: TempoQueryType = 'traceql';

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

  // Set the default query type when the component mounts.
  // Also do this if queryType is 'clear' (which is the case when the user changes the query type)
  // otherwise if the user changes the query type and refreshes the page, no query type will be selected
  // which is inconsistent with how the UI was originally when they selected the Tempo data source.
  async componentDidMount() {
    if (!this.props.query.queryType || this.props.query.queryType === 'clear') {
      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, app } = this.props;

    const logsDatasourceUid = datasource.getLokiSearchDS();

    const graphDatasourceUid = datasource.serviceMap?.datasourceUid;

    let queryTypeOptions: Array<SelectableValue<TempoQueryType>> = [
      { value: 'traceql', label: 'TraceQL' },
      { value: 'upload', label: 'JSON File' },
      { value: 'serviceMap', label: 'Service Graph' },
    ];

    if (!datasource?.search?.hide) {
      queryTypeOptions.unshift({ value: 'nativeSearch', label: 'Search' });
    }

    if (logsDatasourceUid) {
      if (datasource?.search?.hide) {
        // 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) => {
                reportInteraction('grafana_traces_query_type_changed', {
                  datasourceType: 'tempo',
                  app: app ?? '',
                  grafana_version: config.buildInfo.version,
                  newQueryType: v,
                  previousQueryType: query.queryType ?? '',
                });

                this.onClearResults();

                onChange({
                  ...query,
                  queryType: v,
                });
              }}
              size="md"
            />
          </InlineField>
        </InlineFieldRow>
        {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 === 'serviceMap' && (
          <ServiceGraphSection graphDatasourceUid={graphDatasourceUid} query={query} onChange={onChange} />
        )}
        {query.queryType === 'traceql' && (
          <QueryEditor
            datasource={this.props.datasource}
            query={query}
            onRunQuery={this.props.onRunQuery}
            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 LokiQuery)}
          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);
