'use strict';

var assert = require('assert')
var gonna = require('gonna')

var concat = require('concat-stream')
var _ = require('lodash')
var pg = require('pg')

var copy = require('../').from

var client = function() {
  var client = new pg.Client()
  client.connect()
  return client
}

var testConstruction = function() {
  var highWaterMark = 10
  var stream = copy('COPY numbers FROM STDIN', {highWaterMark: 10, objectMode: true})
  for(var i = 0; i < highWaterMark * 1.5; i++) {
    stream.write('1\t2\n')
  }
  assert(!stream.write('1\t2\n'), 'Should correctly set highWaterMark.')
}

testConstruction()

var testRange = function(top) {
  var fromClient = client()
  fromClient.query('CREATE TEMP TABLE numbers(num int, bigger_num int)')

  var txt = 'COPY numbers FROM STDIN'
  var stream = fromClient.query(copy(txt))
  for(var i = 0; i < top; i++) {
    stream.write(Buffer.from('' + i + '\t' + i*10 + '\n'))
  }
  stream.end()
  var countDone = gonna('have correct count')
  stream.on('end', function() {
    fromClient.query('SELECT COUNT(*) FROM numbers', function(err, res) {
      assert.ifError(err)
      assert.equal(res.rows[0].count, top, 'expected ' + top + ' rows but got ' + res.rows[0].count)
      assert.equal(stream.rowCount, top, 'expected ' + top + ' rows but db count is ' + stream.rowCount)
      //console.log('found ', res.rows.length, 'rows')
      countDone()
      var firstRowDone = gonna('have correct result')
      assert.equal(stream.rowCount, top, 'should have rowCount ' + top + ' ')
      fromClient.query('SELECT (max(num)) AS num FROM numbers', function(err, res) {
        assert.ifError(err)
        assert.equal(res.rows[0].num, top-1)
        firstRowDone()
        fromClient.end()
      })
    })
  })
}

testRange(1000)

var testSingleEnd = function() {
  var fromClient = client()
  fromClient.query('CREATE TEMP TABLE numbers(num int)')
  var txt = 'COPY numbers FROM STDIN';
  var stream = fromClient.query(copy(txt))
  var count = 0;
  stream.on('end', function() {
    count++;
    assert(count==1, '`end` Event was triggered ' + count + ' times');
    if (count == 1) fromClient.end();
  })
  stream.end(Buffer.from('1\n'))
    
}
testSingleEnd()

var testClientReuse = function() {
  var fromClient = client()
  fromClient.query('CREATE TEMP TABLE numbers(num int)')
  var txt = 'COPY numbers FROM STDIN';
  var count = 0;
  var countMax = 2;
  var card = 100000;
  var runStream = function() {
    var stream = fromClient.query(copy(txt))
    stream.on('end', function() {
      count++;
      if (count<countMax) {
        runStream()
      } else {
        fromClient.query('SELECT sum(num) AS s FROM numbers', function(err, res) {
          var total = countMax * card * (card+1)
          assert.equal(res.rows[0].s, total, 'copy-from.ClientReuse wrong total')
          fromClient.end()
        })
      }
    })
    stream.write(Buffer.from(_.range(0, card+1).join('\n') + '\n'))
    stream.end(Buffer.from(_.range(0, card+1).join('\n') + '\n'))
  }
  runStream();
}
testClientReuse()