/* SPDX-License-Identifier: GPL-2.0-or-later */
/*
 * Copyright (C) 2019, Google Inc.
 *
 * main.cpp - cam - The libcamera swiss army knife
 */

#include <iostream>
#include <signal.h>
#include <string.h>

#include <libcamera/libcamera.h>

#include "capture.h"
#include "event_loop.h"
#include "main.h"
#include "options.h"

using namespace libcamera;

OptionsParser::Options options;
std::shared_ptr<Camera> camera;
EventLoop *loop;

void signalHandler(int signal)
{
	std::cout << "Exiting" << std::endl;
	loop->exit();
}

static int parseOptions(int argc, char *argv[])
{
	KeyValueParser streamKeyValue;
	streamKeyValue.addOption("role", OptionString,
				 "Role for the stream (viewfinder, video, still)",
				 ArgumentRequired);
	streamKeyValue.addOption("width", OptionInteger, "Width in pixels",
				 ArgumentRequired);
	streamKeyValue.addOption("height", OptionInteger, "Height in pixels",
				 ArgumentRequired);
	streamKeyValue.addOption("pixelformat", OptionInteger, "Pixel format",
				 ArgumentRequired);

	OptionsParser parser;
	parser.addOption(OptCamera, OptionString,
			 "Specify which camera to operate on", "camera",
			 ArgumentRequired, "camera");
	parser.addOption(OptCapture, OptionNone,
			 "Capture until interrupted by user", "capture");
	parser.addOption(OptFile, OptionString,
			 "Write captured frames to disk\n"
			 "The first '#' character in the file name is expanded to the stream name and frame sequence number.\n"
			 "The default file name is 'frame-#.bin'.",
			 "file", ArgumentOptional, "filename");
	parser.addOption(OptStream, &streamKeyValue,
			 "Set configuration of a camera stream", "stream", true);
	parser.addOption(OptHelp, OptionNone, "Display this help message",
			 "help");
	parser.addOption(OptList, OptionNone, "List all cameras", "list");

	options = parser.parse(argc, argv);
	if (!options.valid())
		return -EINVAL;

	if (options.empty() || options.isSet(OptHelp)) {
		parser.usage();
		return options.empty() ? -EINVAL : -EINTR;
	}

	return 0;
}

int main(int argc, char **argv)
{
	int ret;

	ret = parseOptions(argc, argv);
	if (ret < 0)
		return ret == -EINTR ? 0 : EXIT_FAILURE;

	CameraManager *cm = CameraManager::instance();

	ret = cm->start();
	if (ret) {
		std::cout << "Failed to start camera manager: "
			  << strerror(-ret) << std::endl;
		return EXIT_FAILURE;
	}

	loop = new EventLoop(cm->eventDispatcher());

	struct sigaction sa = {};
	sa.sa_handler = &signalHandler;
	sigaction(SIGINT, &sa, nullptr);

	if (options.isSet(OptList)) {
		std::cout << "Available cameras:" << std::endl;
		for (const std::shared_ptr<Camera> &cam : cm->cameras())
			std::cout << "- " << cam->name() << std::endl;
	}

	if (options.isSet(OptCamera)) {
		camera = cm->get(options[OptCamera]);
		if (!camera) {
			std::cout << "Camera "
				  << std::string(options[OptCamera])
				  << " not found" << std::endl;
			goto out;
		}

		if (camera->acquire()) {
			std::cout << "Failed to acquire camera" << std::endl;
			goto out;
		}

		std::cout << "Using camera " << camera->name() << std::endl;
	}

	if (options.isSet(OptCapture)) {
		Capture capture(camera.get());
		ret = capture.run(loop, options);
	}

	if (camera) {
		camera->release();
		camera.reset();
	}
out:
	delete loop;

	cm->stop();

	return ret;
}