/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF 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 { Component, EventEmitter, Input, OnInit, Output, ViewChild } from '@angular/core';
import {
  DataExplorerDataConfig,
  DataExplorerWidgetModel,
  DataLakeMeasure,
  DatalakeRestService,
  DataViewDataExplorerService,
  SourceConfig
} from '@streampipes/platform-services';
import { MatSelectChange } from '@angular/material/select';
import { Tuple2 } from '../../../../core-model/base/Tuple2';
import { zip } from 'rxjs';
import { WidgetConfigurationService } from '../../../services/widget-configuration.service';
import { FieldSelectionPanelComponent } from './field-selection-panel/field-selection-panel.component';
import { GroupSelectionPanelComponent } from './group-selection-panel/group-selection-panel.component';

@Component({
  selector: 'sp-data-explorer-widget-data-settings',
  templateUrl: './data-explorer-widget-data-settings.component.html',
  styleUrls: ['./data-explorer-widget-data-settings.component.scss']
})
export class DataExplorerWidgetDataSettingsComponent implements OnInit {

  @Input() dataConfig: DataExplorerDataConfig;
  @Input() dataLakeMeasure: DataLakeMeasure;
  @Input() newWidgetMode: boolean;
  @Input() widgetId: string;

  @Output() createWidgetEmitter: EventEmitter<Tuple2<DataLakeMeasure, DataExplorerWidgetModel>> =
    new EventEmitter<Tuple2<DataLakeMeasure, DataExplorerWidgetModel>>();
  @Output() dataLakeMeasureChange: EventEmitter<DataLakeMeasure> = new EventEmitter<DataLakeMeasure>();
  @Output() configureVisualizationEmitter: EventEmitter<void> = new EventEmitter<void>();

  @ViewChild('fieldSelectionPanel')
  fieldSelectionPanel: FieldSelectionPanelComponent;

  @ViewChild('groupSelectionPanel')
  groupSelectionPanel: GroupSelectionPanelComponent;


  availablePipelines: DataLakeMeasure[] = [];
  availableMeasurements: DataLakeMeasure[] = [];

  step = 0;

  constructor(private dataExplorerService: DataViewDataExplorerService,
              private datalakeRestService: DatalakeRestService,
              private widgetConfigService: WidgetConfigurationService) {

  }

  ngOnInit(): void {
    this.loadPipelinesAndMeasurements();
  }

  loadPipelinesAndMeasurements() {
    zip(this.dataExplorerService.getAllPersistedDataStreams(), this.datalakeRestService.getAllMeasurementSeries()).subscribe(response => {
      this.availablePipelines = response[0];
      this.availableMeasurements = response[1];

      // replace pipeline event schemas. Reason: Available measures do not contain field for timestamp
      this.availablePipelines.forEach(p => {
        const measurement = this.availableMeasurements.find(m => {
          return m.measureName === p.measureName;
        });
        p.eventSchema = measurement.eventSchema;
      });

      if (!(this.dataConfig.sourceConfigs)) {
        const defaultConfigs = this.findDefaultConfig();
        this.addDataSource(defaultConfigs.measureName, defaultConfigs.sourceType);
        if (defaultConfigs.measureName !== undefined) {
          this.updateMeasure(this.dataConfig.sourceConfigs[0], defaultConfigs.measureName);
        }
      } else {
        this.checkSourceTypes();
      }
    });
  }

  checkSourceTypes() {
    this.dataConfig.sourceConfigs.forEach(sourceConfig => {
      if (sourceConfig.sourceType === 'pipeline' && !this.existsPipelineWithMeasure(sourceConfig.measureName)) {
        sourceConfig.sourceType = 'measurement';
      }
    });
  }

  existsPipelineWithMeasure(measureName: string) {
    return this.availablePipelines.find(pipeline => pipeline.measureName === measureName) !== undefined;
  }

  findDefaultConfig(): { measureName: string, sourceType: 'pipeline' | 'measurement' } {
    if (this.availablePipelines.length > 0) {
      return { measureName: this.availablePipelines[0].measureName, sourceType: 'pipeline'};
    } else if (this.availableMeasurements.length > 0) {
      return { measureName:  this.availableMeasurements[0].measureName, sourceType: 'measurement'};
    } else {
      return { measureName: undefined, sourceType: undefined };
    }
  }

  updateMeasure(sourceConfig: SourceConfig, measureName: string) {
    sourceConfig.measure = this.findMeasure(measureName);
    sourceConfig.queryConfig.fields = [];
    if (this.fieldSelectionPanel) {
      this.fieldSelectionPanel.applyDefaultFields();
    }

    sourceConfig.queryConfig.groupBy = [];
    if (this.groupSelectionPanel) {
      this.groupSelectionPanel.applyDefaultFields();
    }

  }

  findMeasure(measureName: string) {
    return this.availablePipelines.find(pipeline => pipeline.measureName === measureName) ||
      this.availableMeasurements.find(m => m.measureName === measureName);
  }

  setStep(index: number) {
    this.step = index;
  }

  changeDataAggregation() {
    this.fieldSelectionPanel.applyDefaultFields();
    this.triggerDataRefresh();
  }

  addDataSource(measureName = '',
                sourceType: 'pipeline' | 'measurement' = 'pipeline') {
    if (!this.dataConfig.sourceConfigs) {
      this.dataConfig.sourceConfigs = [];
    }
    this.dataConfig.sourceConfigs.push(this.makeSourceConfig(measureName, sourceType));
  }

  makeSourceConfig(measureName = '',
                   sourceType: 'pipeline' | 'measurement' = 'pipeline'): SourceConfig {
    return {
      measureName,
      queryConfig: {
        selectedFilters: [],
        limit: 100,
        page: 1,
        aggregationTimeUnit: 'd',
        aggregationValue: 1
      },
      queryType: 'raw',
      sourceType
    };
  }

  removeSourceConfig(index: number) {
    this.dataConfig.sourceConfigs.splice(index, 1);
  }

  cloneSourceConfig(index: number) {
    const clonedConfig = this.deepCopy(this.dataConfig.sourceConfigs[index]);
    this.dataConfig.sourceConfigs.push(clonedConfig);
  }

  triggerDataRefresh() {
    this.widgetConfigService.notify({widgetId: this.widgetId, refreshData: true, refreshView: true});
  }

  deepCopy(obj) {
    let copy;

    if (null == obj || 'object' !== typeof obj) {
      return obj;
    }

    if (obj instanceof Date) {
      copy = new Date();
      copy.setTime(obj.getTime());
      return copy;
    }

    if (obj instanceof Array) {
      copy = [];
      for (let i = 0, len = obj.length; i < len; i++) {
        copy[i] = this.deepCopy(obj[i]);
      }
      return copy;
    }

    if (obj instanceof Object) {
      copy = {};
      for (const attr in obj) {
        if (obj.hasOwnProperty(attr)) {
          copy[attr] = this.deepCopy(obj[attr]);
        }
      }
      return copy;
    }

    throw new Error('Unable to copy.');
  }

}
