/*
 * 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.
 *
 * Modifications Copyright OpenSearch Contributors. See
 * GitHub history for details.
 */

import {
  EuiPageBody,
  EuiPageHeader,
  EuiPageHeaderSection,
  EuiFlexItem,
  EuiFlexGroup,
  EuiPage,
  EuiButton,
  EuiTitle,
  EuiButtonEmpty,
  EuiSpacer,
  EuiText,
  EuiLink,
  EuiIcon,
} from '@elastic/eui';
import { FormikProps, Formik } from 'formik';
import { get, isEmpty } from 'lodash';
import React, { Fragment, useState, useEffect } from 'react';
import { useDispatch, useSelector } from 'react-redux';
import { RouteComponentProps } from 'react-router-dom';
import { AppState } from '../../../redux/reducers';
import { getMappings } from '../../../redux/reducers/opensearch';
import { useFetchDetectorInfo } from '../../CreateDetectorSteps/hooks/useFetchDetectorInfo';
import { BREADCRUMBS, BASE_DOCS_LINK } from '../../../utils/constants';
import { useHideSideNavBar } from '../../main/hooks/useHideSideNavBar';
import { updateDetector } from '../../../redux/reducers/ad';
import {
  validateFeatures,
  focusOnFirstWrongFeature,
  getCategoryFields,
  focusOnCategoryField,
  getShingleSizeFromObject,
  modelConfigurationToFormik,
} from '../utils/helpers';
import { formikToDetector } from '../../ReviewAndCreate/utils/helpers';
import { formikToModelConfiguration } from '../utils/helpers';
import { Features } from '../components/Features';
import { CategoryField } from '../components/CategoryField';
import { AdvancedSettings } from '../components/AdvancedSettings';
import { SampleAnomalies } from './SampleAnomalies';
import { CoreStart } from '../../../../../../src/core/public';
import { CoreServicesContext } from '../../../components/CoreServices/CoreServices';
import { Detector } from '../../../models/interfaces';
import { prettifyErrorMessage } from '../../../../server/utils/helpers';
import { DetectorDefinitionFormikValues } from '../../DefineDetector/models/interfaces';
import { ModelConfigurationFormikValues } from '../models/interfaces';
import { CreateDetectorFormikValues } from '../../CreateDetectorSteps/models/interfaces';
import { DETECTOR_STATE } from '../../../../server/utils/constants';
import { getErrorMessage } from '../../../utils/utils';

interface ConfigureModelRouterProps {
  detectorId?: string;
}

interface ConfigureModelProps
  extends RouteComponentProps<ConfigureModelRouterProps> {
  isEdit: boolean;
  setStep?(stepNumber: number): void;
  initialValues?: ModelConfigurationFormikValues;
  setInitialValues?(initialValues: ModelConfigurationFormikValues): void;
  detectorDefinitionValues?: DetectorDefinitionFormikValues;
}

export function ConfigureModel(props: ConfigureModelProps) {
  const core = React.useContext(CoreServicesContext) as CoreStart;
  const dispatch = useDispatch();
  useHideSideNavBar(true, false);
  const detectorId = get(props, 'match.params.detectorId', '');
  const { detector, hasError } = useFetchDetectorInfo(detectorId);
  const indexDataTypes = useSelector(
    (state: AppState) => state.opensearch.dataTypes
  );
  const [isHCDetector, setIsHCDetector] = useState<boolean>(
    props.initialValues ? props.initialValues.categoryFieldEnabled : false
  );
  const isLoading = useSelector(
    (state: AppState) => state.opensearch.requesting
  );

  // Jump to top of page on first load
  useEffect(() => {
    scroll(0, 0);
  }, []);

  // When detector is loaded: get any category fields (if applicable) and
  // get all index mappings based on detector's selected index
  useEffect(() => {
    if (detector && get(detector, 'categoryField', []).length > 0) {
      setIsHCDetector(true);
    }
    if (detector?.indices) {
      dispatch(getMappings(detector.indices[0]));
    }
  }, [detector]);

  useEffect(() => {
    if (props.isEdit) {
      core.chrome.setBreadcrumbs([
        BREADCRUMBS.ANOMALY_DETECTOR,
        BREADCRUMBS.DETECTORS,
        {
          text: detector && detector.name ? detector.name : '',
          href: `#/detectors/${detectorId}`,
        },
        BREADCRUMBS.EDIT_MODEL_CONFIGURATION,
      ]);
    } else {
      core.chrome.setBreadcrumbs([
        BREADCRUMBS.ANOMALY_DETECTOR,
        BREADCRUMBS.DETECTORS,
        BREADCRUMBS.CREATE_DETECTOR,
      ]);
    }
  }, [detector]);

  useEffect(() => {
    if (hasError) {
      props.history.push('/detectors');
    }
  }, [hasError]);

  const handleFormValidation = async (
    formikProps: FormikProps<ModelConfigurationFormikValues>
  ) => {
    if (props.isEdit && detector.curState === DETECTOR_STATE.RUNNING) {
      core.notifications.toasts.addDanger(
        'Detector cannot be updated while it is running'
      );
    } else {
      formikProps.setSubmitting(true);
      formikProps.setFieldTouched('featureList');
      formikProps.setFieldTouched('categoryField', isHCDetector);
      formikProps.setFieldTouched('shingleSize');
      formikProps.validateForm().then((errors) => {
        if (isEmpty(errors)) {
          if (props.isEdit) {
            // TODO: possibly add logic to also start RT and/or historical from here. Need to think
            // about adding similar logic from edit detector definition page
            const detectorToUpdate = formikToModelConfiguration(
              formikProps.values,
              detector
            );
            handleUpdateDetector(detectorToUpdate);
          } else {
            optionallySaveValues({
              ...formikProps.values,
              categoryFieldEnabled: isHCDetector,
            });
            //@ts-ignore
            props.setStep(3);
          }
        } else {
          // TODO: can add focus to all components or possibly customize error message too
          if (get(errors, 'featureList')) {
            focusOnFirstWrongFeature(errors, formikProps.setFieldTouched);
          } else if (get(errors, 'categoryField')) {
            focusOnCategoryField();
          }

          core.notifications.toasts.addDanger(
            'One or more input fields is invalid'
          );
        }
      });
    }
    formikProps.setSubmitting(false);
  };

  const handleUpdateDetector = async (detectorToUpdate: Detector) => {
    dispatch(updateDetector(detectorId, detectorToUpdate))
      .then((response: any) => {
        core.notifications.toasts.addSuccess(
          `Detector updated: ${response.response.name}`
        );
        props.history.push(`/detectors/${detectorId}/configurations/`);
      })
      .catch((err: any) => {
        core.notifications.toasts.addDanger(
          prettifyErrorMessage(
            getErrorMessage(err, 'There was a problem updating the detector')
          )
        );
      });
  };

  const optionallySaveValues = (values: ModelConfigurationFormikValues) => {
    if (props.setInitialValues) {
      props.setInitialValues(values);
    }
  };

  const detectorToCreate = props.isEdit
    ? detector
    : formikToDetector({
        ...props.detectorDefinitionValues,
        ...props.initialValues,
      } as CreateDetectorFormikValues);

  return (
    <Formik
      initialValues={
        props.initialValues
          ? props.initialValues
          : modelConfigurationToFormik(detector)
      }
      enableReinitialize={true}
      onSubmit={() => {}}
      validateOnMount={props.isEdit ? false : true}
      validate={validateFeatures}
    >
      {(formikProps) => (
        <Fragment>
          <EuiPage
            style={{
              marginTop: '-24px',
            }}
          >
            <EuiPageBody>
              <EuiPageHeader>
                <EuiPageHeaderSection>
                  <EuiTitle
                    size="l"
                    data-test-subj="configureOrEditModelConfigurationTitle"
                  >
                    <h1>
                      {props.isEdit
                        ? 'Edit model configuration'
                        : 'Configure model'}{' '}
                    </h1>
                  </EuiTitle>
                  <Fragment>
                    <EuiSpacer size="s" />
                    <EuiText>
                      Set the index fields that you want to find anomalies for
                      by defining the model features. You can also set other
                      model parameters such as category field and shingle size
                      for more granular views. After you set the model features
                      and other optional parameters, you can preview your
                      anomalies from a sample feature output.{' '}
                      <EuiLink href={`${BASE_DOCS_LINK}/ad`} target="_blank">
                        Learn more
                      </EuiLink>
                    </EuiText>
                    <EuiSpacer size="s" />
                  </Fragment>
                </EuiPageHeaderSection>
              </EuiPageHeader>
              <Features detector={detector} formikProps={formikProps} />
              <EuiSpacer />
              <CategoryField
                isEdit={props.isEdit}
                isHCDetector={isHCDetector}
                categoryFieldOptions={getCategoryFields(indexDataTypes)}
                setIsHCDetector={setIsHCDetector}
                isLoading={isLoading}
                formikProps={formikProps}
              />
              <EuiSpacer />
              <AdvancedSettings />
              {!isEmpty(detectorToCreate) ? <EuiSpacer /> : null}
              {!isEmpty(detectorToCreate) ? (
                <SampleAnomalies
                  detector={detectorToCreate}
                  featureList={formikProps.values.featureList}
                  shingleSize={formikProps.values.shingleSize}
                  categoryFields={formikProps.values.categoryField}
                  errors={formikProps.errors}
                  setFieldTouched={formikProps.setFieldTouched}
                />
              ) : null}
            </EuiPageBody>
          </EuiPage>

          <EuiFlexGroup
            alignItems="center"
            justifyContent="flexEnd"
            gutterSize="s"
            style={{ marginRight: '12px' }}
          >
            <EuiFlexItem grow={false}>
              <EuiButtonEmpty
                onClick={() => {
                  if (props.isEdit) {
                    props.history.push(
                      `/detectors/${detectorId}/configurations/`
                    );
                  } else {
                    props.history.push('/detectors');
                  }
                }}
              >
                Cancel
              </EuiButtonEmpty>
            </EuiFlexItem>
            {props.isEdit ? null : (
              <EuiFlexItem grow={false}>
                <EuiButton
                  iconSide="left"
                  iconType="arrowLeft"
                  fill={false}
                  data-test-subj="configureModelPreviousButton"
                  //@ts-ignore
                  onClick={() => {
                    optionallySaveValues({
                      ...formikProps.values,
                      categoryFieldEnabled: isHCDetector,
                    });
                    //@ts-ignore
                    props.setStep(1);
                  }}
                >
                  Previous
                </EuiButton>
              </EuiFlexItem>
            )}
            <EuiFlexItem grow={false}>
              {props.isEdit ? (
                <EuiButton
                  type="submit"
                  fill={true}
                  data-test-subj="updateDetectorButton"
                  //@ts-ignore
                  onClick={() => {
                    handleFormValidation(formikProps);
                  }}
                >
                  Save changes
                </EuiButton>
              ) : (
                <EuiButton
                  type="submit"
                  iconSide="right"
                  iconType="arrowRight"
                  fill={true}
                  data-test-subj="configureModelNextButton"
                  isLoading={formikProps.isSubmitting}
                  //@ts-ignore
                  onClick={() => {
                    handleFormValidation(formikProps);
                  }}
                >
                  Next
                </EuiButton>
              )}
            </EuiFlexItem>
          </EuiFlexGroup>
        </Fragment>
      )}
    </Formik>
  );
}