// SPDX-License-Identifier: GPL-2.0-or-later
// Copyright The Music Player Daemon Project

#include "SolarisOutputPlugin.hxx"
#include "../OutputAPI.hxx"
#include "io/FileDescriptor.hxx"
#include "lib/fmt/SystemError.hxx"

#include <cerrno>

#include <sys/ioctl.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <unistd.h>
#include <fcntl.h>

#if defined(__sun)
#include <sys/audio.h>
#include <sys/stropts.h>
#elif defined(__NetBSD__)
#include <sys/audioio.h>
#else

/* some fake declarations that allow build this plugin on systems
   other than Solaris, just to see if it compiles */

#ifndef I_FLUSH
#define I_FLUSH 0
#endif

#define AUDIO_INITINFO(v)
#define AUDIO_GETINFO 0
#define AUDIO_SETINFO 0
#define AUDIO_ENCODING_LINEAR 0

struct audio_info {
	struct {
		unsigned sample_rate, channels, precision, encoding;
	} play;
};

#endif

class SolarisOutput final : AudioOutput {
	/* configuration */
	const char *const device;

	FileDescriptor fd;

	explicit SolarisOutput(const ConfigBlock &block)
		:AudioOutput(0),
		 device(block.GetBlockValue("device", "/dev/audio")) {}

public:
	static AudioOutput *Create(EventLoop &, const ConfigBlock &block) {
		return new SolarisOutput(block);
	}

private:
	void Open(AudioFormat &audio_format) override;
	void Close() noexcept override;

	std::size_t Play(std::span<const std::byte> src) override;
	void Cancel() noexcept override;
};

static bool
solaris_output_test_default_device(void)
{
	struct stat st;

	return stat("/dev/audio", &st) == 0 && S_ISCHR(st.st_mode) &&
		access("/dev/audio", W_OK) == 0;
}

void
SolarisOutput::Open(AudioFormat &audio_format)
{
	struct audio_info info;
	int ret;

	AUDIO_INITINFO(&info);

	/* open the device in non-blocking mode */

	if (!fd.Open(device, O_WRONLY|O_NONBLOCK))
		throw FmtErrno("Failed to open {}", device);

	/* restore blocking mode */

	fd.SetBlocking();

	/* configure the audio device */

	info.play.sample_rate = audio_format.sample_rate;
	info.play.channels = audio_format.channels;
	info.play.encoding = AUDIO_ENCODING_LINEAR;
	switch (audio_format.format) {
	case SampleFormat::S8:
		info.play.precision = 8;
		break;
	case SampleFormat::S16:
		info.play.precision = 16;
		break;
	default:
		info.play.precision = 32;
		audio_format.format = SampleFormat::S32;
		break;
	}

	ret = ioctl(fd.Get(), AUDIO_SETINFO, &info);
	if (ret < 0) {
		const int e = errno;
		fd.Close();
		throw MakeErrno(e, "AUDIO_SETINFO failed");
	}
}

void
SolarisOutput::Close() noexcept
{
	fd.Close();
}

std::size_t
SolarisOutput::Play(std::span<const std::byte> src)
{
	ssize_t nbytes = fd.Write(src.data(), src.size());
	if (nbytes <= 0)
		throw MakeErrno("Write failed");

	return nbytes;
}

void
SolarisOutput::Cancel() noexcept
{
#if defined(AUDIO_FLUSH)
	ioctl(fd.Get(), AUDIO_FLUSH);
#elif defined(I_FLUSH)
	ioctl(fd.Get(), I_FLUSH);
#endif
}

const struct AudioOutputPlugin solaris_output_plugin = {
	"solaris",
	solaris_output_test_default_device,
	&SolarisOutput::Create,
	nullptr,
};