import { Component, OnInit, ViewChild } from '@angular/core';
import { PlotService, PlotType, PlotRequest, PlotResponse, TagField, FilterDefaults  } from '../plot.service';
import { Observable } from 'rxjs/Observable';
import { FormControl, Validators } from '@angular/forms';
import { LimitByComponent } from '../limit-by/limit-by.component';
import { YAxisRangeComponent } from '../y-axis-range/y-axis-range.component';
import { QueryAutocompleteComponent } from '../query-autocomplete/query-autocomplete.component';
import {PlotViewComponent, SelectionRange, DateAnchor} from '../plot-view/plot-view.component'
import * as moment from 'moment';

@Component({
  selector: 'pdb-visualization-page',
  templateUrl: './visualization-page.component.html',
  styleUrls: ['./visualization-page.component.scss']
})
export class VisualizationPageComponent implements OnInit {
  
  readonly DATE_PATTERN = "YYYY-MM-DD HH:mm:ss"; // for moment-JS
  
  dateRange = new FormControl('2019-10-05 00:00:00 - 2019-10-11 23:59:59');
  
  availablePlotTypes = {};
  
  selectedPlotType = new FormControl('');
  plotTypes: Array<any>;
  
  selectedCombinePlotType = new FormControl('');
  combinePlotTypes: Array<any>;
  
  tagFields: Array<TagField> = new Array<TagField>();
  
  groupBy = new Array<TagField>();
  
  @ViewChild(LimitByComponent, {static: false})
  private limitbycomponent : LimitByComponent;
    
  yAxisScale: string;
  
  @ViewChild(YAxisRangeComponent, {static: false})
  private yAxisRangeComponent : YAxisRangeComponent;
  
  @ViewChild(QueryAutocompleteComponent, {static: false})
  query: QueryAutocompleteComponent;
  
  @ViewChild(PlotViewComponent, {static: false})
  plotView: PlotViewComponent;
    
  enableGallery = false;
  splitBy = null;

  constructor(private plotService: PlotService) {
  }

  ngOnInit() {
    const that = this;
    this.plotTypes = this.plotService.getPlotTypes();
    this.selectedPlotType.setValue(this.plotTypes[0]);
    
    this.plotTypes.forEach(pt => this.availablePlotTypes[pt.name] = pt);
    
    this.combinePlotTypes = this.getCombinablePlotTypes(this.selectedPlotType.value);
    
    that.plotService.getFilterDefaults().subscribe(function(filterDefaults) {
    
      filterDefaults.fields.forEach(function(name) {
        that.tagFields.push(new TagField(name));
      });
    
      that.groupBy = that.tagFields.filter(val => filterDefaults.groupBy.includes(val.name));
      that.splitBy = that.tagFields.find(val => filterDefaults.splitBy == val.name);
    });
    this.yAxisScale = "LOG10";
    
    this.selectedPlotType.valueChanges.subscribe(function(selectedMainPlotType){
      that.combinePlotTypes = that.getCombinablePlotTypes(selectedMainPlotType);
      if (!that.combinePlotTypes.includes(that.selectedCombinePlotType.value)){
        that.selectedCombinePlotType.setValue('');
      }
    });
  }
    
  getCombinablePlotTypes(selectedMainPlotType) : Array<any>{
      //const mainPlotType = this.availablePlotTypes[selectedMainPlotType];
      const mainPlotType = selectedMainPlotType;
      
      const compatiblePlotTypes = this.plotTypes.filter(pt => pt.compatible(mainPlotType));
      return compatiblePlotTypes;
  }
  
  dateRangeAsString() : string {
    return (<HTMLInputElement>document.getElementById("search-date-range")).value;
  }
  
  gallery(){
    const that = this;
    this.plotService.splitQuery(this.query.query, this.splitBy.name).subscribe(function(valuesForSplitBy){
      console.log("valuesForSplitBy: " + JSON.stringify(valuesForSplitBy));
      that.plotView.errorMessage = '';
    },
    error => {
      that.plotView.imageUrl = '';
      that.plotView.errorMessage = error.error.message;
    });
  }
    
  plot(){
    const that = this;
    
    that.plotView.errorMessage = '';
    that.plotView.imageUrl = '';
    
    
    const aggregates = [];
    aggregates.push(this.selectedPlotType.value.id);
    if (this.selectedCombinePlotType.value){
      aggregates.push(this.selectedCombinePlotType.value.id);
    }
    
    const request = new PlotRequest();
    request.query = this.query.query;
    request.height = document.getElementById("results").offsetHeight-1;
    request.width = document.getElementById("results").offsetWidth-1;
    request.groupBy = this.groupBy.map(o => o.name);
    request.limitBy = this.limitbycomponent.limitBy;
    request.limit = this.limitbycomponent.limit;
    request.dateRange = this.dateRangeAsString(); 
    request.axisScale = this.yAxisScale;
    request.aggregates = aggregates; 
    request.keyOutside = false;
    request.generateThumbnail = this.enableGallery;
    request.yRangeMin = this.yAxisRangeComponent.minYValue;
    request.yRangeMax = this.yAxisRangeComponent.maxYValue;
    request.yRangeUnit = this.yAxisRangeComponent.yAxisUnit;
    
    
    this.plotService.sendPlotRequest(request).subscribe(function(plotResponse){
      console.log("response: " + JSON.stringify(plotResponse));
      that.plotView.imageUrl = "http://"+window.location.hostname+':8080/'+plotResponse.imageUrl;
      that.plotView.errorMessage = '';
    },
    error => {
      that.plotView.imageUrl = '';
      that.plotView.errorMessage = error.error.message;
    });
  }
  
  /**
   * Zoom in/out by zoomFaktor, so that the anchorInPercentOfDateRange keeps the same position.
   *
   * shiftDateByAnchor(dateRangeAsString, 0.20, 0.5) zooms in by 50%, so that the date that was at 20% before the zoom is still at 20% after the zoom
   * shiftDateByAnchor(dateRangeAsString, 0.33, 2) zooms out by 50%, so that the date that was at 33% before the zoom is still at 33% after the zoom
   */
  shiftDateByAnchor(dateRange:string, anchorInPercentOfDateRange:number, zoomFactor:number)
  {
      const dateRangeParsed = this.parseDateRange(dateRange);
      const dateRangeInSeconds = dateRangeParsed.duration.asSeconds();
      
      const anchorTimestampInSeconds = dateRangeParsed.startDate.clone().add(Math.floor(dateRangeInSeconds*anchorInPercentOfDateRange), "seconds");
      const newDateRangeInSeconds = dateRangeInSeconds * zoomFactor;
      
      const newStartDate = anchorTimestampInSeconds.clone().subtract(newDateRangeInSeconds*anchorInPercentOfDateRange, "seconds");
      const newEndDate = newStartDate.clone().add({seconds: newDateRangeInSeconds});;
      
      this.setDateRange(newStartDate, newEndDate);
  }
  
  /**
   * Zoom in/out or shift date by adding factorStartDate*dateRangeInSeconds seconds to the start date
   * and factorEndDate*dateRangeInSeconds seconds to the end date.
   * 
   * shiftDate(dateRangeAsString, 0.25, -0.25) will zoom in, making the range half its size
   * shiftDate(dateRangeAsString, -0.5, 0.5) will zoom out, making the range double its size
   * shiftDate(dateRangeAsString, -0.5, -0.5) will move the range by half its size to older values
   * shiftDate(dateRangeAsString, 1, 1) will move the range by its size to newer values
   */
  shiftDate(dateRange: string, factorStartDate: number, factorEndDate: number)
  {
      const dateRangeParsed = this.parseDateRange(dateRange);
      const dateRangeInSeconds = dateRangeParsed.duration.asSeconds();
      
      const newStartDate = dateRangeParsed.startDate.add({seconds: dateRangeInSeconds*factorStartDate});
      const newEndDate = dateRangeParsed.endDate.add({seconds: dateRangeInSeconds*factorEndDate});
      
      this.setDateRange(newStartDate, newEndDate);
  }
  
  parseDateRange(dateRangeAsString : string) : DateRange {
    if (dateRangeAsString) {
      const startDate = moment(dateRangeAsString.slice(0, 19));
      const endDate = moment(dateRangeAsString.slice(22, 41));
      
      return {
        startDate: startDate,
        endDate: endDate,
        duration: moment.duration(endDate.diff(startDate))
      };
    }
  }
  
  setDateRange(startDate: any, endDate: any) {
    const formattedStartDate = startDate.format(this.DATE_PATTERN);
    const formattedEndDate = endDate.format(this.DATE_PATTERN);
    
    const newDateRange = formattedStartDate+" - "+formattedEndDate;
    
    (<HTMLInputElement>document.getElementById("search-date-range")).value = newDateRange;
    this.plot();
  }
  
  zoomRange(range: SelectionRange) {
    this.shiftDate(this.dateRangeAsString(), range.startPercentOfDateRange, range.endPercentOfDateRange-1);
  }
  
  zoomWithDateAnchor(dateAnchor: DateAnchor){
    this.shiftDateByAnchor(this.dateRangeAsString(), dateAnchor.cursorPercentOfDateRange, dateAnchor.zoomFactor);
  }

}

export class DateRange {
  startDate: any;
  endDate: any;
  duration: any;
      
  
}