/*
NAME
  alsa_test.go

AUTHOR
  Trek Hopton <trek@ausocean.org>
  Scott Barnard <scott@ausocean.org>

LICENSE
  This file is Copyright (C) 2019-2020 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 in gpl.txt.
  If not, see http://www.gnu.org/licenses.
*/

// Package alsa provides access to input from ALSA audio devices.
package alsa

import (
	"bytes"
	"io/ioutil"
	"os"
	"strconv"
	"testing"
	"time"

	"bitbucket.org/ausocean/av/codec/codecutil"
	"bitbucket.org/ausocean/av/codec/pcm"
	"bitbucket.org/ausocean/av/revid/config"
	"bitbucket.org/ausocean/utils/logger"
)

func TestDevice(t *testing.T) {
	// We want to open a device with a standard configuration.
	c := config.Config{
		SampleRate: 8000,
		Channels:   1,
		RecPeriod:  0.3,
		BitDepth:   16,
		InputCodec: codecutil.ADPCM,
	}
	n := 2 // Number of periods to wait while recording.

	// Create a new ALSA device, start, read/lex, and then stop it.
	l := logger.New(logger.Debug, os.Stderr, true)
	ai := New(l)
	err := ai.Set(c)
	// If there was an error opening the device, skip this test.
	if _, ok := err.(OpenError); ok {
		t.Skip(err)
	}
	// For any other error, report it.
	if err != nil {
		t.Error(err)
	}
	err = ai.Start()
	if err != nil {
		t.Error(err)
	}
	cs := pcm.DataSize(c.SampleRate, c.Channels, c.BitDepth, c.RecPeriod, c.InputCodec)
	lexer, err := codecutil.NewByteLexer(cs)
	go lexer.Lex(ioutil.Discard, ai, time.Duration(c.RecPeriod*float64(time.Second)))
	time.Sleep(time.Duration(c.RecPeriod*float64(time.Second)) * time.Duration(n))
	ai.Stop()
}

var powerTests = []struct {
	in  int
	out int
}{
	{36, 32},
	{47, 32},
	{3, 4},
	{46, 32},
	{7, 8},
	{2, 2},
	{36, 32},
	{757, 512},
	{2464, 2048},
	{18980, 16384},
	{70000, 65536},
	{8192, 8192},
	{2048, 2048},
	{65536, 65536},
	{-2048, 1},
	{-127, 1},
	{-1, 1},
	{0, 1},
	{1, 2},
}

func TestNearestPowerOfTwo(t *testing.T) {
	for _, tt := range powerTests {
		t.Run(strconv.Itoa(tt.in), func(t *testing.T) {
			v := nearestPowerOfTwo(tt.in)
			if v != tt.out {
				t.Errorf("got %v, want %v", v, tt.out)
			}
		})
	}
}

func TestIsRunning(t *testing.T) {
	const dur = 250 * time.Millisecond
	const sampleRate = 1000
	const channels = 1
	const bitDepth = 16
	const recPeriod = 1

	l := logger.New(logger.Debug, &bytes.Buffer{}, true) // Discard logs.
	d := New(l)

	err := d.Set(config.Config{
		SampleRate: sampleRate,
		Channels:   channels,
		BitDepth:   bitDepth,
		RecPeriod:  recPeriod,
		InputCodec: codecutil.ADPCM,
	})
	if err != nil {
		t.Skipf("could not set device: %w", err)
	}

	err = d.Start()
	if err != nil {
		t.Fatalf("could not start device %w", err)
	}

	time.Sleep(dur)

	if !d.IsRunning() {
		t.Error("device isn't running, when it should be")
	}

	err = d.Stop()
	if err != nil {
		t.Error(err.Error())
	}

	time.Sleep(dur)

	if d.IsRunning() {
		t.Error("device is running, when it should not be")
	}
}