/*
 * Copyright (C) 2014 Jared Boone, ShareBrained Technology, Inc.
 *
 * This file is part of PortaPack.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2, or (at your option)
 * any later version.
 *
 * This program 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 this program; see the file COPYING.  If not, write to
 * the Free Software Foundation, Inc., 51 Franklin Street,
 * Boston, MA 02110-1301, USA.
 */

#include "event_m4.hpp"

#include "portapack_shared_memory.hpp"

#include "message_queue.hpp"

#include "ch.h"

#include "lpc43xx_cpp.hpp"
using namespace lpc43xx;

#include <cstdint>
#include <array>

extern "C" {

CH_IRQ_HANDLER(MAPP_IRQHandler) {
	CH_IRQ_PROLOGUE();

	chSysLockFromIsr();
	EventDispatcher::events_flag_isr(EVT_MASK_BASEBAND);
	chSysUnlockFromIsr();

	creg::m0apptxevent::clear();

	CH_IRQ_EPILOGUE();
}

}

Thread* EventDispatcher::thread_event_loop = nullptr;

EventDispatcher::EventDispatcher(
	std::unique_ptr<BasebandProcessor> baseband_processor
) : baseband_processor { std::move(baseband_processor) }
{
}

void EventDispatcher::run() {
	thread_event_loop = chThdSelf();

	lpc43xx::creg::m0apptxevent::enable();

	while(is_running) {
		const auto events = wait();
		dispatch(events);
	}

	lpc43xx::creg::m0apptxevent::disable();
}

void EventDispatcher::request_stop() {
	is_running = false;
}

eventmask_t EventDispatcher::wait() {
	return chEvtWaitAny(ALL_EVENTS);
}

void EventDispatcher::dispatch(const eventmask_t events) {
	if( events & EVT_MASK_BASEBAND ) {
		handle_baseband_queue();
	}

	if( events & EVT_MASK_SPECTRUM ) {
		handle_spectrum();
	}
}

void EventDispatcher::handle_baseband_queue() {
	const auto message = shared_memory.baseband_message;
	if( message ) {
		on_message(message);
		shared_memory.baseband_message = nullptr;
	}
}

void EventDispatcher::on_message(const Message* const message) {
	switch(message->id) {
	case Message::ID::Shutdown:
		on_message_shutdown(*reinterpret_cast<const ShutdownMessage*>(message));
		break;

	default:
		on_message_default(message);
		break;
	}
}

void EventDispatcher::on_message_shutdown(const ShutdownMessage&) {
	request_stop();
}

void EventDispatcher::on_message_default(const Message* const message) {
	baseband_processor->on_message(message);
}

void EventDispatcher::handle_spectrum() {
	const UpdateSpectrumMessage message;
	baseband_processor->on_message(&message);
}