/*
  This script parses the big gun violence CSV and filters for lines containing a particular string.

  479363,
  2013-01-19,New Mexico,Albuquerque,2806 Long Lane,
  5,0,
  http://www.gunviolencearchive.org/incident/479363,
  http://hinterlandgazette.com/2013/01/pastor-greg-griego-identified-victims-killed-nehemiah-griego-albuquerque-nm-shooting.html,
  False,1,

  gun_stolen,
  0::Unknown||1::Unknown,

  gun_type,
  0::22 LR||1::223 Rem [AR-15],
  
  incident_characteristics,
  "Shot - Dead (murder, accidental, suicide)
  ||Mass Shooting (4+ victims injured or killed excluding the subject/suspect/perpetrator, one location)
  ||Domestic Violence",

  latitude, location_description, longitude,
  34.9791,,-106.716,

  n_guns_involved, notes,
  2,,

  participant_age,
  0::51||1::40||2::9||3::5||4::2||5::15,

  participant_age_group,
  0::Adult 18+||1::Adult 18+||2::Child 0-11||3::Child 0-11||4::Child 0-11||5::Teen 12-17,

  participant_gender,
  0::Male||1::Female||2::Male||3::Female||4::Female||5::Male,

  participant_name,
  0::Greg Griego||1::Sara Griego||2::Zephania Griego||3::Jael Griego||4::Angelina Griego||5::Nehemiah Griego,

  participant_relationship,
  5::Family,

  participant_status,
  "0::Killed||1::Killed||2::Killed||3::Killed||4::Killed||5::Unharmed, Arrested",

  participant_type,
  0::Victim||1::Victim||2::Victim||3::Victim||4::Victim||5::Subject-Suspect,

  http://www.cbsnews.com/news/nehemiah-gringo-case-memorial-service-planned-for-family-allegedly-slain-by-new-mexico-teen/||
  http://www.thewire.com/national/2013/01/teenager-reportedly-used-ar-15-kill-five-new-mexico/61199/||
  http://bigstory.ap.org/article/officials-nm-teen-gunman-kills-5-inside-home||
  http://www.huffingtonpost.com/2013/01/21/nehemiah-griego-teen-shoots-parents-3-children_n_2519359.html||
  http://murderpedia.org/male.G/g/griego-nehemiah.htm||
  http://hinterlandgazette.com/2013/01/pastor-greg-griego-identified-victims-killed-nehemiah-griego-albuquerque-nm-shooting.html,
  10,14
*/

const fs = require('fs')
const parse = require('csv-parse')
const stringify = require('csv-stringify')

const search = "AR-15"
const fields = ("incident_id,date,state,city_or_county,"
  + "address,n_killed,n_injured,incident_url,source_url,"
  + "incident_url_fields_missing,congressional_district,"
  + "gun_stolen,gun_type,incident_characteristics,latitude,"
  + "location_description,longitude,n_guns_involved,notes,"
  + "participant_age,participant_age_group,participant_gender,"
  + "participant_name,participant_relationship,"
  + "participant_status,participant_type,"
  + "sources,state_house_district,state_senate_district")
  .split(',')
  .reduce((a,b,i) => {
    a[b] = i
  }, {})

const search = 'AR-15'
const regexp = new RegExp(search, 'i')

function test(row){
  return row[fields.gun_type].match(regexp)
}

const input = fs.createReadStream('./data/gun_violence.csv')
const parser = parse()
const stringifier = stringify()
const output = fs.createWriteStream('./data/' + search + '.csv')

stream.on('readable', function() {
  var buf;
  while ((buf = stream.read()) !== null) {
    parser.write(buf)
  }
});
stream.on('finish', function(){
  parser.end()
})

parser.on('readable', function(){
  let record
  while (record = parser.read()) {
    if (test(record[fields])) {
      stringifier.write(record)
    }
  }
})
parser.on('error', function(err){
  console.error(err.message)
})
parser.on('end', function(){
  stringifier.end()
})

stringifier.on('readable', function(){
  let row;
  while(row = stringifier.read()){
    output.write(row)
  }
})
stringifier.on('error', function(err){
  // console.error(err.message)
})
stringifier.on('finish', function(){
  output.end()
})