#!/usr/bin/perl -w
use strict;
use warnings;
use SDL;
use SDL::Config;

my $audiodriver;

BEGIN {
	use Config;
	if ( !$Config{'useithreads'} ) {
		print("1..0 # Skip: Perl not compiled with 'useithreads'\n");
		exit(0);
	}
	require threads;
	require threads::shared;


	use Test::More;
	use lib 't/lib';
	use SDL::TestTool;

	$audiodriver = $ENV{SDL_AUDIODRIVER};
	$ENV{SDL_AUDIODRIVER} = 'dummy' unless $ENV{SDL_RELEASE_TESTING};

	if ( !SDL::TestTool->init(SDL_INIT_AUDIO) ) {
		plan( skip_all => 'Failed to init sound' );
	} elsif ( !SDL::Config->has('SDL_mixer') ) {
		plan( skip_all => 'SDL_mixer support not compiled' );
	}
}
use SDL::Mixer;
use SDL::Mixer::Channels;
use SDL::Mixer::Effects;
use SDL::Mixer::Samples;

my $can_open = SDL::Mixer::open_audio( 44100, SDL::Audio::AUDIO_S16SYS, 2, 4096 );

unless($can_open == 0) 
{
	plan( skip_all => 'Cannot open audio :'.SDL::get_error() );
}

is( $can_open ,
		0, '[open_audio] ran'
  );

my $delay           = 500;
my $audio_test_file = 'test/data/silence.wav';
SDL::Mixer::Channels::volume( -1, 1 );

if ( $ENV{'SDL_RELEASE_TESTING'} ) {
	SDL::Mixer::Channels::volume( -1, 20 );
	$delay           = 1000;
	$audio_test_file = 'test/data/sample.wav';
}

my $effect_func_called : shared = 0;
my $effect_done_called : shared = 0;
my @last_stream                 = ();

sub echo_effect_func {
	my $channel  = shift;
	my $samples  = shift;
	my $position = shift;
	my @stream   = @_;

	$effect_func_called++;
	printf(
			"[effect_func] callback: channel=%2s, position=%8s, samples=%6s\n",
			$channel, $position, scalar(@stream)
		  );

	my @stream2 = @stream;
	my $offset  = $samples / 2;
	for ( my $i = 0; $i < $samples; $i += 2 ) {
		if ( $i < $offset ) {
			if ( scalar(@last_stream) == $samples ) {
				$stream2[$i] = $stream[$i] * 0.6 + $last_stream[ $samples + $i - $offset ] * 0.4; # left
					$stream2[ $i + 1 ] =
					$stream[ $i + 1 ] * 0.6 + $last_stream[ $samples + $i - $offset + 1 ] * 0.4;  # right
			}
		} else {
			$stream2[$i] = $stream[$i] * 0.6 + $stream[ $i - $offset ] * 0.4;                     # left
				$stream2[ $i + 1 ] = $stream[ $i + 1 ] * 0.6 + $stream[ $i - $offset + 1 ] * 0.4;     # right
		}
	}

	@last_stream = @stream;
	push( @stream2, $position + $samples );
	return @stream2;
}

sub echo_effect_func2 {
	my $channel  = shift;
	my $samples  = shift;
	my $position = shift;
	my @stream   = @_;

	$effect_func_called++;
	printf(
			"[effect_func2] callback: channel=%2s, position=%8s, samples=%6s\n",
			$channel, $position, scalar(@stream)
		  );
	push( @stream, $position + $samples );
	return @stream;

}

sub effect_done2 {
	printf("[effect_done2] called\n");
	$effect_done_called++;
}

sub effect_done {
	printf("[effect_done] called\n");
	$effect_done_called++;
}

my $sample_chunk = SDL::Mixer::Samples::load_WAV($audio_test_file);
my $playing_channel = SDL::Mixer::Channels::play_channel( -1, $sample_chunk, -1 );
is( $playing_channel >= 0, 1, "[play_channel] playing $audio_test_file" );

SDL::delay($delay);
my $effect_id = SDL::Mixer::Effects::register(
		$playing_channel,     "main::echo_effect_func2",
		"main::effect_done2", 0
		);
isnt( $effect_id, -1, '[register] registerering echo effect callback' );
SDL::delay($delay);
my $check = SDL::Mixer::Effects::unregister( $playing_channel, $effect_id );
isnt(
		$check, 0,
		'[unregister] unregistering effect_func will call effect_done'
	);
SDL::delay(200);
is( $effect_func_called > 0,
		1, "[effect_func] called $effect_func_called times"
  );
is( $effect_done_called > 0,
		1, "[effect_done] called $effect_done_called times"
  );

SDL::delay($delay);
$effect_func_called = 0;
$effect_done_called = 0;

$effect_id = SDL::Mixer::Effects::register(
		$playing_channel,     "main::echo_effect_func2",
		"main::effect_done2", 0
		);
isnt( $effect_id, -1, '[register] registerering echo effect callback' );
SDL::delay($delay);
$check = SDL::Mixer::Effects::unregister( $playing_channel, $effect_id );
isnt(
		$check, 0,
		'[unregister] unregistering effect_func will call effect_done'
	);
SDL::delay(200);
is( $effect_func_called > 0,
		1, "[effect_func] called $effect_func_called times"
  );
is( $effect_done_called > 0,
		1, "[effect_done] called $effect_done_called times"
  );

$effect_func_called = 0;
$effect_done_called = 0;
my $effect_id_all = SDL::Mixer::Effects::register( MIX_CHANNEL_POST, "main::echo_effect_func",
		"main::effect_done", 0
		);
isnt( $effect_id_all, -1, '[register] registerering echo effect callback' );
SDL::delay($delay);
isnt(
		SDL::Mixer::Effects::unregister_all(MIX_CHANNEL_POST),
		0, '[unregister_all] unregistering all will call effect_done'
	);
SDL::delay(200);
is( $effect_func_called > 0,
		1, "[effect_func] called $effect_func_called times"
  );
is( $effect_done_called > 0,
		1, "[effect_done] called $effect_done_called times"
  );

$effect_func_called = 0;
is( SDL::Mixer::Effects::set_post_mix( "main::echo_effect_func", 0 ),
		undef, '[set_post_mix] registering echo effect callback'
  );
SDL::delay($delay);
is( SDL::Mixer::Effects::set_post_mix(),
		undef, '[set_post_mix] unregistering echo effect callback'
  );
SDL::delay(200);
is( $effect_func_called > 0,
		1, "[effect_func] called $effect_func_called times"
  );
SDL::delay($delay);

isnt(
		SDL::Mixer::Effects::set_panning( $playing_channel, 128, 255 ),
		0, '[set_panning]  50% left, 100% right'
	);
SDL::delay($delay);
isnt(
		SDL::Mixer::Effects::set_position( $playing_channel, 225, 80 ),
		0, '[set_position] left-behind, 33% away'
	);
SDL::delay($delay);
isnt(
		SDL::Mixer::Effects::set_distance( $playing_channel, 160 ),
		0, '[set_distance] 66% away'
	);
SDL::delay($delay);
isnt(
		SDL::Mixer::Effects::set_position( $playing_channel, 0, 0 ),
		0, '[set_position] front, 0% away'
	);
SDL::delay($delay);
isnt(
		SDL::Mixer::Effects::set_reverse_stereo( $playing_channel, 1 ),
		0, '[set_reverse_stereo] on'
	);
SDL::delay($delay);
isnt(
		SDL::Mixer::Effects::set_reverse_stereo( $playing_channel, 0 ),
		0, '[set_reverse_stereo] off'
	);
SDL::delay($delay);

SDL::Mixer::close_audio();
pass '[close_audio] ran';

if ($audiodriver) {
	$ENV{SDL_AUDIODRIVER} = $audiodriver;
} else {
	delete $ENV{SDL_AUDIODRIVER};
}

done_testing();