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

export interface RawData {
  index: string[];
  values: 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-data');
    const temp = await response.json();
    const index = temp.index;
    const values = temp.values;
    return {index, values};
  }

// 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-windows', {
      method: 'POST',
      headers: {
        'Accept': 'application/json',
        'Content-Type': 'application/json'
      },
      body: JSON.stringify(postData)
    });
    return await response.json();
  }

// Generate LSH-tables by hashing each window
  async initialize(query): Promise<any> {
    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();
  }

  // Update
  async update(query, hashFunctions, parameters): Promise<any> {
    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, hash_functions: hashFunctions, parameters}) ], { type: 'text/plain' } )
    });
    return await response.json();
  }

  async getQueryWindow(window) {
    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();
  }

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