/*
 * SPDX-License-Identifier: Apache-2.0
 *
 * The OpenSearch Contributors require contributions made to
 * this file be licensed under the Apache-2.0 license or a
 * compatible open source license.
 *
 * Any modifications Copyright OpenSearch Contributors. See
 * GitHub history for details.
 */

/*
 * Licensed to Elasticsearch B.V. under one or more contributor
 * license agreements. See the NOTICE file distributed with
 * this work for additional information regarding copyright
 * ownership. Elasticsearch B.V. licenses this file to you under
 * the Apache License, Version 2.0 (the "License"); you may
 * not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *    http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */

import React, { useState, useEffect, useCallback } from 'react';
import {
  EuiFlexGroup,
  EuiFlexItem,
  EuiToolTip,
  EuiText,
  EuiSelect,
  EuiIconTip,
} from '@elastic/eui';
import { I18nProvider } from '@osd/i18n/react';
import { i18n } from '@osd/i18n';
import moment from 'moment';

export interface TimechartHeaderProps {
  /**
   * Format of date to be displayed
   */
  dateFormat?: string;
  /**
   * Interval for the buckets of the recent request
   */
  bucketInterval?: {
    scaled?: boolean;
    description?: string;
    scale?: number;
  };
  /**
   * Range of dates to be displayed
   */
  timeRange?: {
    from: string;
    to: string;
  };
  /**
   * Interval Options
   */
  options: Array<{ display: string; val: string }>;
  /**
   * changes the interval
   */
  onChangeInterval: (interval: string) => void;
  /**
   * selected interval
   */
  stateInterval: string;
}

export function TimechartHeader({
  bucketInterval,
  dateFormat,
  timeRange,
  options,
  onChangeInterval,
  stateInterval,
}: TimechartHeaderProps) {
  const [interval, setInterval] = useState(stateInterval);
  const toMoment = useCallback(
    (datetime: string) => {
      if (!datetime) {
        return '';
      }
      if (!dateFormat) {
        return datetime;
      }
      return moment(datetime).format(dateFormat);
    },
    [dateFormat]
  );

  useEffect(() => {
    setInterval(stateInterval);
  }, [stateInterval]);

  const handleIntervalChange = (e: React.ChangeEvent<HTMLSelectElement>) => {
    setInterval(e.target.value);
    onChangeInterval(e.target.value);
  };

  if (!timeRange || !bucketInterval) {
    return null;
  }

  return (
    <I18nProvider>
      <EuiFlexGroup gutterSize="s" responsive justifyContent="center" alignItems="center">
        <EuiFlexItem grow={false}>
          <EuiToolTip
            content={i18n.translate('discover.howToChangeTheTimeTooltip', {
              defaultMessage: 'To change the time, use the global time filter above',
            })}
            delay="long"
          >
            <EuiText data-test-subj="discoverIntervalDateRange" size="s">
              {`${toMoment(timeRange.from)} - ${toMoment(timeRange.to)} ${
                interval !== 'auto'
                  ? i18n.translate('discover.timechartHeader.timeIntervalSelect.per', {
                      defaultMessage: 'per',
                    })
                  : ''
              }`}
            </EuiText>
          </EuiToolTip>
        </EuiFlexItem>
        <EuiFlexItem grow={false}>
          <EuiSelect
            aria-label={i18n.translate('discover.timechartHeader.timeIntervalSelect.ariaLabel', {
              defaultMessage: 'Time interval',
            })}
            compressed
            id="dscResultsIntervalSelector"
            data-test-subj="discoverIntervalSelect"
            options={options
              .filter(({ val }) => val !== 'custom')
              .map(({ display, val }) => {
                return {
                  text: display,
                  value: val,
                  label: display,
                };
              })}
            value={interval}
            onChange={handleIntervalChange}
            append={
              bucketInterval.scaled ? (
                <EuiIconTip
                  id="discoverIntervalIconTip"
                  content={i18n.translate('discover.bucketIntervalTooltip', {
                    defaultMessage:
                      'This interval creates {bucketsDescription} to show in the selected time range, so it has been scaled to {bucketIntervalDescription}.',
                    values: {
                      bucketsDescription:
                        bucketInterval!.scale && bucketInterval!.scale > 1
                          ? i18n.translate('discover.bucketIntervalTooltip.tooLargeBucketsText', {
                              defaultMessage: 'buckets that are too large',
                            })
                          : i18n.translate('discover.bucketIntervalTooltip.tooManyBucketsText', {
                              defaultMessage: 'too many buckets',
                            }),
                      bucketIntervalDescription: bucketInterval.description,
                    },
                  })}
                  color="warning"
                  size="s"
                  type="alert"
                />
              ) : undefined
            }
          />
        </EuiFlexItem>
      </EuiFlexGroup>
    </I18nProvider>
  );
}