/* 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.
 */

#ifndef APP_FM_H
#define APP_FM_H

#include "driver/keyboard.h"

#define FM_CHANNEL_UP	0x01
#define FM_CHANNEL_DOWN	0xFF

enum {
	FM_SCAN_OFF = 0,
};

extern uint16_t          g_fm_channels[20];
extern bool              g_fm_radio_mode;
extern uint8_t           g_fm_radio_tick_500ms;
extern volatile uint16_t g_fm_play_tick_10ms;
extern volatile int8_t   g_fm_scan_state;
extern bool              g_fm_auto_scan;
extern uint8_t           g_fm_channel_position;
// Doubts about          whether this should be signed or not
extern uint16_t          g_fm_frequency_deviation;
extern bool              g_fm_found_frequency;
extern bool              g_fm_auto_scan;
extern uint8_t           g_fm_resume_tick_500ms;
extern uint16_t          g_fm_restore_tick_10ms;

bool    FM_CheckValidChannel(uint8_t Channel);
uint8_t FM_FindNextChannel(uint8_t Channel, uint8_t Direction);
int     FM_ConfigureChannelState(void);
void    FM_TurnOff(void);
void    FM_EraseChannels(void);

void    FM_Tune(uint16_t Frequency, int8_t Step, bool bFlag);
void    FM_PlayAndUpdate(void);
int     FM_CheckFrequencyLock(uint16_t Frequency, uint16_t LowerLimit);

void    FM_process_key(key_code_t Key, bool bKeyPressed, bool bKeyHeld);

void    FM_Play(void);
void    FM_Start(void);

#endif