import { Injectable, OnInit } from '@angular/core';
import { HttpClient, HttpParams } from '@angular/common/http';
import { Observable } from 'rxjs/Observable';
import { map } from 'rxjs/operators';


@Injectable({
  providedIn: 'root'
})
export class PlotService {

  plotTypes: Array<PlotType>;
    
  constructor(private http: HttpClient) {
    this.plotTypes = new Array<PlotType>();
    this.plotTypes.push(new PlotType("SCATTER","Scatter","scatter-chart2",true,DataType.Time,DataType.Duration));
    this.plotTypes.push(new PlotType("HEATMAP", "Heatmap", "heatmap", false, DataType.Other, DataType.Other));
    this.plotTypes.push(new PlotType("CONTOUR", "Contour", "contour-chart", false, DataType.Time, DataType.Duration));
    this.plotTypes.push(new PlotType("CUM_DISTRIBUTION", "Cumulative Distribution", "cumulative-distribution-chart", true, DataType.Percent, DataType.Duration));
    this.plotTypes.push(new PlotType("HISTOGRAM", "Histogram", "histogram", true, DataType.HistogramBin, DataType.HistogramCount));
    this.plotTypes.push(new PlotType("RIDGELINES", "Ridgelines", "ridgelines", false, DataType.Other, DataType.Other));
    this.plotTypes.push(new PlotType("QQ", "Quantile-Quantile", "quantile-quantile", false, DataType.Other, DataType.Other));
    this.plotTypes.push(new PlotType("PARALLEL", "Parallel Requests", "parallel-requests-chart", true, DataType.Time, DataType.Count));
    this.plotTypes.push(new PlotType("VIOLIN", "Violin", "violin-chart", false, DataType.Group, DataType.Duration));
    this.plotTypes.push(new PlotType("STRIP", "Strip", "strip-chart", false, DataType.Group, DataType.Duration));
    this.plotTypes.push(new PlotType("PIE", "Pie", "pie-chart", false, DataType.Other, DataType.Other));
    this.plotTypes.push(new PlotType("BAR", "Bar", "bar-chart", false, DataType.Other, DataType.Other));
    this.plotTypes.push(new PlotType("STEP_FIT", "Step Fit", "step-fit", false, DataType.Other, DataType.Other));
    this.plotTypes.push(new PlotType("LAG", "Lag", "lag-plot", false, DataType.Other, DataType.Other));
    this.plotTypes.push(new PlotType("ACF", "ACF", "acf-plot", false, DataType.Other, DataType.Other));
  }
  
  ngOnInit() {
    
  }
  
  getPlotTypes(): Array<PlotType> {
    return this.plotTypes.filter(plotType => plotType.active);
  }
  
  getTagFields(): Observable<Array<string>> {
    return this.http.get<Array<string>>('//'+window.location.hostname+':8080/fields');
  }
  
  autocomplete(query: string, caretIndex: number, resultMode: ResultMode): Observable<AutocompleteResult>
  {
    const options = { 
      params: new HttpParams()
        .set('caretIndex', ""+caretIndex)
        .set('query', query)
        .set('resultMode', resultMode)
    };
    return this.http.get<AutocompleteResult>('//'+window.location.hostname+':8080/autocomplete', options);
  }
  
  sendPlotRequest(plotRequest: PlotRequest): Observable<PlotResponse>{
    
    //console.log("send plot request: "+  JSON.stringify(plotRequest));
    return this.http.post<PlotResponse>('//'+window.location.hostname+':8080/plots', plotRequest);
  }
  
  getFilterDefaults(): Observable<FilterDefaults>{
    return this.http.get<FilterDefaults>('//'+window.location.hostname+':8080/filters/defaults')
  }
  
  splitQuery(query: string, splitBy:string) : Observable<Array<string>>{
    
    const q = "("+query+") and "+splitBy+"=";
    return this.autocomplete(q, q.length+1, ResultMode.FULL_VALUES).pipe(
      map(
        autocompleteResult => autocompleteResult.proposals.map(suggestion => suggestion.value)
      )
    );
  }
}


export class PlotType {
  id: string;
  name: string;
  icon: string
  active: boolean;
  xAxis: DataType;
  yAxis: DataType;
  
  constructor(id: string, name: string, icon: string, active: boolean, xAxis: DataType, yAxis: DataType) {
    this.id = id;
    this.name = name;
    this.icon = icon;
    this.active = active;
    this.xAxis = xAxis;
    this.yAxis = yAxis;
  }
  
  compatible(other: PlotType) : boolean {
  
    const xEqual = this.xAxis === other.xAxis;
    const yEqual = this.yAxis === other.yAxis;
    const anyIsOther = this.xAxis === DataType.Other 
                      || this.yAxis === DataType.Other 
                      || other.xAxis === DataType.Other 
                      || other.yAxis === DataType.Other;
  
    var result = xEqual || yEqual;
    
    // if either dimension is Other, then this plot is not compatible with any other plot
    result = result && !anyIsOther;
    
    // is not the same
    result = result && this.name != other.name;
    return result;
  } 
}

export class TagField {
  name: string;
  
  constructor(name: string) {
    this.name = name;
  }
}

export enum DataType {
    Time,
    Duration,
    Percent,
    Count,
    Group,
    Metric,
    HistogramBin,
    HistogramCount,
    Other
}

export class Suggestion {
  value: string;
  newQuery: string;
  newCaretPosition: number;
}


export class AutocompleteResult{
  proposals: Array<Suggestion>;
}

export class PlotRequest {
  query : string;
  height : number;
  width : number;
  thumbnailMaxWidth : number = 300;
  thumbnailMaxHeight : number = 200;
  groupBy : Array<string>;
  limitBy : string;
  axisScale : string;
  limit : number;
  dateRange : string;
  aggregates : Array<string>;
  yRangeMin : number;
  yRangeMax : number;
  yRangeUnit  : string;
  keyOutside : boolean = false;
  generateThumbnail : boolean;
  
  copy(): PlotRequest {
    return JSON.parse(JSON.stringify(this));
  }
}

export class PlotResponse {
  imageUrl : string;
  stats : PlotResponseStats;
  thumbnailUrl : string;
}

export class PlotResponseStats {
  maxValue : number;
  values : number;
  average : number ;
  plottedValues : number;
  dataSeriesStats : Array<DataSeriesStats>;
}

export class DataSeriesStats {
  values : number;
  maxValue : number;
  average : number;
  plottedValues : number;
}

export class FilterDefaults {
  groupBy: Array<string>;
  fields: Array<string>; 
  splitBy: string;
}

export enum ResultMode {
  CUT_AT_DOT = "CUT_AT_DOT", 
  FULL_VALUES = "FULL_VALUES"
}