/* Copyright 2023 Dual Tachyon
 * https://github.com/DualTachyon
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 *     Unless required by applicable law or agreed to in writing, software
 *     distributed under the License is distributed on an "AS IS" BASIS,
 *     WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *     See the License for the specific language governing permissions and
 *     limitations under the License.
 */

#include "app/fm.h"
#include "app/scanner.h"
#include "audio.h"
#include "functions.h"
#include "helper/battery.h"
#include "misc.h"
#include "settings.h"

#define DECREMENT_AND_TRIGGER(cnt, flag) \
	do { \
		if (cnt) { \
			if (--cnt == 0) { \
				flag = true; \
			} \
		} \
	} while(0)

static volatile uint32_t gGlobalSysTickCounter;

void SystickHandler(void);

void SystickHandler(void)
{
	gGlobalSysTickCounter++;
	gNextTimeslice = true;
	if ((gGlobalSysTickCounter % 50) == 0) {
		gNextTimeslice500ms = true;
		DECREMENT_AND_TRIGGER(gTxTimerCountdown, gTxTimeoutReached);
	}
	if ((gGlobalSysTickCounter & 3) == 0) {
		gNextTimeslice40ms = true;
	}
	if (gSystickCountdown2) {
		gSystickCountdown2--;
	}
	if (gFoundCDCSSCountdown) {
		gFoundCDCSSCountdown--;
	}
	if (gFoundCTCSSCountdown) {
		gFoundCTCSSCountdown--;
	}
	if (gCurrentFunction == FUNCTION_FOREGROUND) {
		DECREMENT_AND_TRIGGER(gBatterySaveCountdown, gSchedulePowerSave);
	}
	if (gCurrentFunction == FUNCTION_POWER_SAVE) {
		DECREMENT_AND_TRIGGER(gBatterySave, gBatterySaveCountdownExpired);
	}

	if (gScanState == SCAN_OFF && gCssScanMode == CSS_SCAN_MODE_OFF && gEeprom.DUAL_WATCH != DUAL_WATCH_OFF) {
		if (gCurrentFunction != FUNCTION_MONITOR && gCurrentFunction != FUNCTION_TRANSMIT) {
			if (gCurrentFunction != FUNCTION_RECEIVE) {
				DECREMENT_AND_TRIGGER(gDualWatchCountdown, gScheduleDualWatch);
			}
		}
	}

	#ifndef DISABLE_NOAA
		if (gScanState == SCAN_OFF && gCssScanMode == CSS_SCAN_MODE_OFF && gEeprom.DUAL_WATCH == DUAL_WATCH_OFF)
			if (gIsNoaaMode && gCurrentFunction != FUNCTION_MONITOR && gCurrentFunction != FUNCTION_TRANSMIT)
				if (gCurrentFunction != FUNCTION_RECEIVE)
					DECREMENT_AND_TRIGGER(gNOAA_Countdown, gScheduleNOAA);
	#endif

	if (gScanState != SCAN_OFF || gCssScanMode == CSS_SCAN_MODE_SCANNING) {
		if (gCurrentFunction != FUNCTION_MONITOR && gCurrentFunction != FUNCTION_TRANSMIT) {
			DECREMENT_AND_TRIGGER(ScanPauseDelayIn10msec, gScheduleScanListen);
		}
	}

	DECREMENT_AND_TRIGGER(gTailNoteEliminationCountdown, gFlagTteComplete);

	#ifndef DISABLE_VOICE
		DECREMENT_AND_TRIGGER(gCountdownToPlayNextVoice, gFlagPlayQueuedVoice);
	#endif
	
	if (gFM_ScanState != FM_SCAN_OFF && gCurrentFunction != FUNCTION_MONITOR) {
		if (gCurrentFunction != FUNCTION_TRANSMIT && gCurrentFunction != FUNCTION_RECEIVE) {
			DECREMENT_AND_TRIGGER(gFmPlayCountdown, gScheduleFM);
		}
	}
	if (gVoxStopCountdown) {
		gVoxStopCountdown--;
	}
}