/*
NAME
  BitrateCalculator_test.go - is a file that may be used to test the
	BitrateCalculator.go file using the golang testing utilities

DESCRIPTION
  See Readme.md

AUTHOR
  Saxon Nelson-Milton <saxon.milton@gmail.com>

LICENSE
  BitrateCalculator_test.go is Copyright (C) 2017 the Australian Ocean Lab (AusOcean)

  It is free software: you can redistribute it and/or modify them
  under the terms of the GNU General Public License as published by the
  Free Software Foundation, either version 3 of the License, or (at your
  option) any later version.

  It is distributed in the hope that it will be useful, but WITHOUT
  ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
 for more details.

  You should have received a copy of the GNU General Public License
  along with revid in gpl.txt.  If not, see [GNU licenses](http://www.gnu.org/licenses).
*/

package bitrate

import (
	"testing"
	"time"
)

// Some consts used over duration of testing
const (
	bitrateDelay1 = 0 // s
	bitrateDelay2 = 5 // s
	amountOfData  = 100000.0
	testTime      = 2500.0 // ms
)

// This will be the BitrateCalculator object we use over testing
var bitrateCalc BitrateCalculator

// Simple test to check that the calculator can calc bitrate over a given
// duration of time
func Test1(t *testing.T) {
	bitrateCalc = BitrateCalculator{}
	bitrateCalc.Start(bitrateDelay1)
	time.Sleep(testTime * time.Millisecond)
	currentBitrate := int64(bitrateCalc.Stop(amountOfData))
	actualBitrate := int64(amountOfData / ((testTime * time.Millisecond) / 1e9))
	if currentBitrate != actualBitrate {
		t.Errorf("Bitrate is wrong! Calculated: %v Actual %v", currentBitrate, actualBitrate)
	}
}

// Now let's check that the output delay feature works
func Test2(t *testing.T) {
	bitrateCalc = BitrateCalculator{}
	var currentBitrate int64
	for i := 0; i < 2; i++ {
		bitrateCalc.Start(bitrateDelay2)
		time.Sleep(testTime * time.Millisecond)
		currentBitrate = int64(bitrateCalc.Stop(amountOfData))
		if i == 0 && currentBitrate != 0 {
			t.Errorf("The bitrate calc did not delay outputting!")
		}
		time.Sleep(6000 * time.Millisecond)
	}
	actualBitrate := int64(amountOfData / ((testTime * time.Millisecond) / 1e9))
	if currentBitrate != actualBitrate {
		t.Errorf("Bitrate is wrong! Calculated: %v Actual %v", currentBitrate, actualBitrate)
	}
}