import { Injectable } from '@angular/core';

export interface RawData {
  index: string[][];
  values: number[][];
}

export interface LshData {
  candidates: number[];
  distances: number[];
  hash_functions: number[];// number[][][][];
  parameters?: number[];
}

export interface TableInfoData {
  prototypes: {
    average: number[];
    min: number[];
    max: number[];
  }[];
  distances: number[][];
}

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

  constructor() { }

  // Read input data
  async readFile(): Promise<RawData[]> {
    const response = await fetch('http://127.0.0.1:5000/read-mts-data');
    return await response.json();
  }

  // Split data into windows and normalize
  async createWindows(parameters): Promise<any> {
    const postData = {parameters};
    const response = await fetch('http://127.0.0.1:5000/create-mts-windows', {
      method: 'POST',
      headers: {
        'Accept': 'application/json',
        'Content-Type': 'application/json'
      },
      body: JSON.stringify(postData)
    });
  }

  // Calculate parameters for LSH + find candidates using LSH
  async lshInitial(query): Promise<LshData> {
    const response = await fetch('http://127.0.0.1:5000/initialize', {
      method: 'POST',
      headers: {
        'Accept': 'application/json',
        'Content-Type': 'application/json'
      },
      body: new Blob( [ JSON.stringify({query}) ], { type: 'text/plain' } )
    });
    return await response.json();
  }

  // Find candidates using LSH with weights
  async lshUpdate(query, weights, parameters): Promise<LshData> {
    const response = await fetch('http://127.0.0.1:5000/update', {
      method: 'POST',
      headers: {
        'Accept': 'application/json',
        'Content-Type': 'application/json'
      },
      body: new Blob( [ JSON.stringify({query, weights, parameters}) ], { type: 'text/plain' } )
    });
    return await response.json();
  }

  // Get query window based on windows labeled correct
  async getQueryWindow(window): Promise<number[][]> {
    const response = await fetch('http://127.0.0.1:5000/query', {
      method: 'POST',
      headers: {
        'Accept': 'application/json',
        'Content-Type': 'application/json'
      },
      body: JSON.stringify({window})
    });
    return await response.json();
  }

  // Get data of a window by indices
  async getWindowByIndices(indices: number[]): Promise<number[][][]> {
    const response = await fetch('http://127.0.0.1:5000/window', {
      method: 'POST',
      headers: {
        'Accept': 'application/json',
        'Content-Type': 'application/json'
      },
      body: JSON.stringify({indices})
    });
    return await response.json();
  }

  async getTableInfo(windows): Promise<TableInfoData> {
    const response = await fetch('http://127.0.0.1:5000/table-info', {
      method: 'POST',
      headers: {
        'Accept': 'application/json',
        'Content-Type': 'application/json'
      },
      body: JSON.stringify({windows})
    });
    return await response.json();
  }
}