import {EventEmitter, Injectable} from '@angular/core';
import {ApiService, LshData, RawData, TableInfoData} from './api.service';

@Injectable({
  providedIn: 'root'
})
export class StateService {
  public loadingProgress: number = 0;

  private _rawData: RawData[];
  private _lshData: LshData;
  private _tableInfo: TableInfoData;
  private _queryWindow: number[][];
  private _table: {[bucket: string]: number[]}[];
  public _averageTable: {[bucket: string]: number[]};
  private _weights: number[];

  private _currentTab: number;
  private _labels = {};
  private _sliderValue;
  private _lshParameters: number[];

  private states = [];

  public windowSize = 120;
  public nrOfTables = 5;
  public hashSize = 5;
  public stepSize = 200;
  public querySelectionMode = true;

  public onNewData: EventEmitter<void> = new EventEmitter<void>();
  public onNewWindows: EventEmitter<void> = new EventEmitter<void>();
  public onNewQuery: EventEmitter<void> = new EventEmitter<void>();
  public onNewTable: EventEmitter<void> = new EventEmitter<void>();
  public onNewTableInfo: EventEmitter<void> = new EventEmitter<void>();
  public onNewLshData: EventEmitter<void> = new EventEmitter<void>();

  public onNewLabels: EventEmitter<void> = new EventEmitter<void>();
  public onNewTab: EventEmitter<void> = new EventEmitter<void>();
  public onNewSlider: EventEmitter<number> = new EventEmitter<number>();

  constructor(private api: ApiService) {
     this.initialize();
  }

  async initialize(): Promise<void> {
    this.loadingProgress = 0;
    await this.getRawData();
    this.loadingProgress = 50;
    await this.createWindows();
    this.loadingProgress = 100;
  }

  async reset(): Promise<void> {
    this.loadingProgress = 50;
    await this.createWindows();
    this.loadingProgress = 100;
  }

  async getRawData(): Promise<void> {
    this.rawData = await this.api.readFile();
  }

  async createWindows(): Promise<void> {
    await this.api.createWindows(this.parameters);
    this.onNewWindows.emit();
  }

  async lshInitial(): Promise<void> {
    this.lshData = await this.api.lshInitial(this._queryWindow);
    console.log('data loaded');
    this._lshParameters = this.lshData.parameters;
    this._weights = [1, 1, 1];
    this.createTable();
  }

  async update(labels): Promise<void> {
    this._weights = await this.api.getWeights(this._queryWindow, labels, this._weights);
    console.log(this._weights);
    this.lshData = await this.api.lshUpdate(this._queryWindow, this._weights, this._lshParameters);
    this.createTable();
  }

  async getTableInfo(table: number[][]): Promise<TableInfoData> {
    // console.log(this.tableInfo);
    return await this.api.getTableInfo(table);
  }

  async getQueryWindow(windowIndex: number | {[index: number]: boolean}): Promise<number[][]> {
    this.queryWindow = await this.api.getQueryWindow(windowIndex);
    console.log(this.queryWindow);
    return this._queryWindow;
  }

  async getWindow(indices: number[]): Promise<number[][][]> {
    return await this.api.getWindowByIndices(indices);
  }

  async createTable() {
    console.log('setting table param');
    this.table = this.lshData.tables;
    console.log('table param set');
    const averageTable = {};
    const length = this.lshData.average_distances.length;
    const median = this.lshData.average_distances[Math.ceil(length / 2)];
    const stepsize = median / 10;
    const indices: number[] = this.lshData.average_distances.map((x) => x > median * 2 ? 19 : Math.floor(x / stepsize));
    this.lshData.average_candidates.forEach((candidate: number, index: number) => {
      if (averageTable[indices[index]] === undefined)
      {
        averageTable[indices[index]] = [];
      }
      averageTable[indices[index]].push(candidate);
    });
    this._averageTable = averageTable;
    console.log('table created');
    this.tableInfo = await this.getTableInfo(Object.values(this._averageTable));
  }

  public set rawData(v: RawData[]) {
    this._rawData = v;
    console.log(this._rawData);
    this.onNewData.emit();
  }

  public get rawData(): RawData []{
    return this._rawData;
  }

  public set lshData(v: LshData) {
    console.log(v);
    this._lshData = v;
    this.onNewLshData.emit();
  }

  public get lshData(): LshData {
    return this._lshData;
  }

  public set tableInfo(v: TableInfoData) {
    this._tableInfo = v;
    this.onNewTableInfo.emit();
  }

  public get tableInfo(): TableInfoData {
    return this._tableInfo;
  }

  public set table(v: {[bucket: string]: number[]}[]) {
    console.log(v);
    this._table = v;
    console.log('emitting onNewTable');
    this.onNewTable.emit();
  }

  public get table(): {[bucket: string]: number[]}[] {
    return this._table;
  }

  public set labels(v) {
    this._labels = v;
    this.onNewLabels.emit();
  }

  public get labels() {
    return this._labels;
  }

  public set currentTab(v: number) {
    this._currentTab = v;
    this.onNewTab.emit();
  }

  public get currentTab(): number {
    return this._currentTab;
  }

  public set sliderValue(v: number) {
    this._sliderValue = v;
    this.onNewSlider.emit(v);
  }

  public get sliderValue(): number {
    return this._sliderValue;
  }

  public set queryWindow(v: number[][]) {
    this._queryWindow = v;
    this.onNewQuery.emit();
  }

  public get queryWindow(): number[][] {
    return this._queryWindow;
  }

  public get lshParameters(): number[] {
    return this._lshParameters;
  }

  public get parameters(): {[parameter: string]: number} {
    return {
      windowsize: this.windowSize,
      hashsize: this.hashSize,
      tablesize: this.nrOfTables,
      stepsize: this.stepSize
    };
  }
}