import React, { SyntheticEvent } from 'react';

import { CoreApp, SelectableValue } from '@grafana/data';
import { selectors } from '@grafana/e2e-selectors';
import { EditorField, EditorRow, EditorSwitch } from '@grafana/experimental';
import { AutoSizeInput, RadioButtonGroup, Select } from '@grafana/ui';

import { getQueryTypeChangeHandler, getQueryTypeOptions } from '../../components/PromExploreExtraField';
import { PromQueryFormat } from '../../dataquery.gen';
import { PromQuery } from '../../types';
import { QueryOptionGroup } from '../shared/QueryOptionGroup';

import { FORMAT_OPTIONS, INTERVAL_FACTOR_OPTIONS } from './PromQueryEditorSelector';
import { getLegendModeLabel, PromQueryLegendEditor } from './PromQueryLegendEditor';

export interface UIOptions {
  exemplars: boolean;
  type: boolean;
  format: boolean;
  minStep: boolean;
  legend: boolean;
  resolution: boolean;
}

export interface Props {
  query: PromQuery;
  app?: CoreApp;
  onChange: (update: PromQuery) => void;
  onRunQuery: () => void;
}

export const PromQueryBuilderOptions = React.memo<Props>(({ query, app, onChange, onRunQuery }) => {
  const onChangeFormat = (value: SelectableValue<PromQueryFormat>) => {
    onChange({ ...query, format: value.value });
    onRunQuery();
  };

  const onChangeStep = (evt: React.FormEvent<HTMLInputElement>) => {
    onChange({ ...query, interval: evt.currentTarget.value });
    onRunQuery();
  };

  const queryTypeOptions = getQueryTypeOptions(
    app === CoreApp.Explore || app === CoreApp.Correlations || app === CoreApp.PanelEditor
  );
  const onQueryTypeChange = getQueryTypeChangeHandler(query, onChange);

  const onExemplarChange = (event: SyntheticEvent<HTMLInputElement>) => {
    const isEnabled = event.currentTarget.checked;
    onChange({ ...query, exemplar: isEnabled });
    onRunQuery();
  };

  const onIntervalFactorChange = (value: SelectableValue<number>) => {
    onChange({ ...query, intervalFactor: value.value });
    onRunQuery();
  };

  const formatOption = FORMAT_OPTIONS.find((option) => option.value === query.format) || FORMAT_OPTIONS[0];
  const queryTypeValue = getQueryTypeValue(query);
  const queryTypeLabel = queryTypeOptions.find((x) => x.value === queryTypeValue)!.label;

  return (
    <EditorRow>
      <div data-testid={selectors.components.DataSource.Prometheus.queryEditor.options}>
        <QueryOptionGroup
          title="Options"
          collapsedInfo={getCollapsedInfo(query, formatOption.label!, queryTypeLabel, app)}
        >
          <PromQueryLegendEditor
            legendFormat={query.legendFormat}
            onChange={(legendFormat) => onChange({ ...query, legendFormat })}
            onRunQuery={onRunQuery}
          />
          <EditorField
            label="Min step"
            tooltip={
              <>
                An additional lower limit for the step parameter of the Prometheus query and for the{' '}
                <code>$__interval</code> and <code>$__rate_interval</code> variables.
              </>
            }
          >
            <AutoSizeInput
              id={selectors.components.DataSource.Prometheus.queryEditor.step}
              type="text"
              aria-label="Set lower limit for the step parameter"
              placeholder={'auto'}
              minWidth={10}
              onCommitChange={onChangeStep}
              defaultValue={query.interval}
            />
          </EditorField>
          <EditorField label="Format">
            <Select
              data-testid={selectors.components.DataSource.Prometheus.queryEditor.format}
              value={formatOption}
              allowCustomValue
              onChange={onChangeFormat}
              options={FORMAT_OPTIONS}
            />
          </EditorField>
          <EditorField label="Type" data-testid={selectors.components.DataSource.Prometheus.queryEditor.type}>
            <RadioButtonGroup options={queryTypeOptions} value={queryTypeValue} onChange={onQueryTypeChange} />
          </EditorField>
          {shouldShowExemplarSwitch(query, app) && (
            <EditorField label="Exemplars">
              <EditorSwitch
                value={query.exemplar || false}
                onChange={onExemplarChange}
                id={selectors.components.DataSource.Prometheus.queryEditor.exemplars}
              />
            </EditorField>
          )}
          {query.intervalFactor && query.intervalFactor > 1 && (
            <EditorField label="Resolution">
              <Select
                aria-label="Select resolution"
                isSearchable={false}
                options={INTERVAL_FACTOR_OPTIONS}
                onChange={onIntervalFactorChange}
                value={INTERVAL_FACTOR_OPTIONS.find((option) => option.value === query.intervalFactor)}
              />
            </EditorField>
          )}
        </QueryOptionGroup>
      </div>
    </EditorRow>
  );
});

function shouldShowExemplarSwitch(query: PromQuery, app?: CoreApp) {
  if (app === CoreApp.UnifiedAlerting || !query.range) {
    return false;
  }

  return true;
}

function getQueryTypeValue(query: PromQuery) {
  return query.range && query.instant ? 'both' : query.instant ? 'instant' : 'range';
}

function getCollapsedInfo(query: PromQuery, formatOption: string, queryType: string, app?: CoreApp): string[] {
  const items: string[] = [];

  items.push(`Legend: ${getLegendModeLabel(query.legendFormat)}`);
  items.push(`Format: ${formatOption}`);
  items.push(`Step: ${query.interval ?? 'auto'}`);
  items.push(`Type: ${queryType}`);

  if (shouldShowExemplarSwitch(query, app)) {
    if (query.exemplar) {
      items.push(`Exemplars: true`);
    } else {
      items.push(`Exemplars: false`);
    }
  }
  return items;
}

PromQueryBuilderOptions.displayName = 'PromQueryBuilderOptions';
