import { Injectable, OnInit } from '@angular/core';
import { HttpClient, HttpParams } from '@angular/common/http';
import { Observable } from 'rxjs';
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("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("PARALLEL", "Parallel Requests", "parallel-requests-chart", true, DataType.Time, DataType.Count));
    this.plotTypes.push(new PlotType("BAR", "Bar", "bar-chart", true, DataType.Group, DataType.Count));
   
    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("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("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("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));
  }
    
  getPlotTypes(): Array<PlotType> {
    return this.plotTypes.filter(plotType => plotType.active);
  }
  
  getTagFields(): Observable<Array<string>> {
    return this.http.get<Array<string>>('//'+window.location.hostname+':'+window.location.port+'/api/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+':'+window.location.port+'/api/autocomplete', options);
  }
  
  sendPlotRequest(plotRequest: PlotRequest): Observable<PlotResponse>{
    
    //console.log("send plot request: "+  JSON.stringify(plotRequest));
    const result = this.http.post<PlotResponse>('//'+window.location.hostname+':'+window.location.port+'/api/plots', plotRequest);
    return result.pipe(map(this.enrichStats));
  }

  enrichStats(response: PlotResponse): PlotResponse {
    let maxAvgRatio  = 0;
    let x : DataSeriesStats[] = response.stats.dataSeriesStats;
    for (const row in x){
      for (const col in x){
        maxAvgRatio = Math.max(maxAvgRatio, x[row].average / x[col].average);
      }
    }
    
    response.stats.maxAvgRatio = maxAvgRatio;

    return response;
  }
  
  getFilterDefaults(): Observable<FilterDefaults>{
    return this.http.get<FilterDefaults>('//'+window.location.hostname+':'+window.location.port+'/api/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) => autocompleteResult.proposals.map((suggestion: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(others: Array<PlotType>) : boolean {
    var xAxisTypes = new Set([this.xAxis]);
    var yAxisTypes = new Set([this.yAxis]);
  
    for(var i = 0; i < others.length; i++){
      var other = others[i];
      xAxisTypes.add(other.xAxis);
      yAxisTypes.add(other.yAxis);
    }
  
    return xAxisTypes.size <= 2 && yAxisTypes.size <= 2;
  }
}

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 AxesTypes {
  x : Array<DataType>;
  y : Array<DataType>;
  
  constructor(x: Array<DataType>, y : Array<DataType>) {
    this.x = x;
    this.y = y;
  }
  
  hasXAxis(type : DataType){
    return this.x.includes(type);
  }
  
  hasYAxis(type : DataType){
    return this.y.includes(type);
  }
  
  /**
   * return the 1-indexed axis data type, e.g. getXAxisDataType(1) for the x1 axis 
   */
  getXAxisDataType(index: number){
    if (this.x.length+1 >= index){
      return this.x[index-1];
    }
    return undefined;
  }
  
  /**
   * return the 1-indexed axis data type, e.g. getYAxisDataType(1) for the x1 axis 
   */
  getYAxisDataType(index: number){
    if (this.y.length+1 >= index){
      return this.y[index-1];
    }
    return undefined;
  }
  
  toString() {
    const x1 = this.getXAxisDataType(1);
    const y1 = this.getYAxisDataType(1);
    const x2 = this.getXAxisDataType(2);
    const y2 = this.getYAxisDataType(2);
  
    return (x1 ? "x1:"+DataType[x1] : "")
      + (y1 ? " y1:"+DataType[y1] : "")
      + (x2 ? " x2:"+DataType[x2] : "")
      + (y2 ? " y2:"+DataType[y2] : ""); 
  }
}

export class Suggestion {
  constructor(
    public value: string,
    public newQuery: string,
    public newCaretPosition: number){}
}


export class AutocompleteResult{
  constructor(public proposals: Array<Suggestion>){}
}

export class PlotRequest {
  constructor(
    public query : string,
    public height : number,
    public width : number,
    public thumbnailMaxWidth : number = 300,
    public thumbnailMaxHeight : number = 200,
    public groupBy : Array<string>,
    public limitBy : string,
    public limit : number,
    public y1:YAxisDefinition,
    public y2:YAxisDefinition|undefined,
    public dateRange : string,
    public aggregates : Array<string>,
    public keyOutside : boolean = false,
    public generateThumbnail : boolean,
    public intervalUnit: string,
    public intervalValue: number,
    public renderBarChartTickLabels: boolean = false){}
  
  copy(): PlotRequest {
    return JSON.parse(JSON.stringify(this));
  }
}

export class YAxisDefinition {
  constructor(
    public axisScale : string,
    public rangeMin : number,
    public rangeMax : number,
    public rangeUnit  : string){}
}

export class PlotResponse {
  constructor(
    public imageUrl : string,
    public stats : PlotResponseStats,
    public thumbnailUrl : string){}
}

export class PlotResponseStats {
  constructor(
    public maxValue : number,
    public values : number,
    public average : number,
    public plottedValues : number,
    public maxAvgRatio: number,
    public dataSeriesStats : Array<DataSeriesStats>){}
}

export class DataSeriesStats {
  constructor(
    public name: string,
    public values : number,
    public maxValue : number,
    public average : number ,
    public plottedValues : number,
    public dashTypeAndColor: DashTypeAndColor,
    public percentiles: Map<string, number>){}
}

export class DashTypeAndColor {
  constructor(
    public color: string,
    public pointType: number) {}
}

export class FilterDefaults {
  constructor(
    public groupBy: Array<string>,
    public fields: Array<string>, 
    public splitBy: string){}
}

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