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'use strict';

const { Readable } = require('stream');
const JSON2CSVTransform = require('./JSON2CSVTransform');

class JSON2CSVAsyncParser {
  constructor(opts, transformOpts) {
    this.opts = opts;
    this.transformOpts = transformOpts;
  }

  /**
   * Main function that converts json to csv.
   *
   * @param {Stream|Array|Object} data Array of JSON objects to be converted to CSV
   * @returns {Stream} A stream producing the CSV formated data as a string
   */
  parse(data) {
    if (typeof data === 'string' || ArrayBuffer.isView(data)) {
      data = Readable.from(data, { objectMode: false });
    } else if (Array.isArray(data)) {
      data = Readable.from(data.filter(item => item !== null));
    } else if (typeof data === 'object' && !(data instanceof Readable)) {
      data = Readable.from([data]);
    }
    
    if (!(data instanceof Readable)) {
      throw new Error('Data should be a JSON object, JSON array, typed array, string or stream');
    }

    return data.pipe(new JSON2CSVTransform(this.opts, { objectMode: data.readableObjectMode, ...this.transformOpts }));
  }
}

module.exports = JSON2CSVAsyncParser;