/* 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 <string.h>

#include "app/action.h"
#include "app/fm.h"
#include "app/generic.h"
#include "audio.h"
#include "bsp/dp32g030/gpio.h"
#include "driver/bk1080.h"
#include "driver/eeprom.h"
#include "driver/gpio.h"
#include "functions.h"
#include "misc.h"
#include "settings.h"
#include "ui/inputbox.h"
#include "ui/ui.h"

#ifndef ARRAY_SIZE
	#define ARRAY_SIZE(x) (sizeof(x) / sizeof(x[0]))
#endif

uint16_t          gFM_Channels[20];
bool              gFmRadioMode;
uint8_t           gFmRadioCountdown;
volatile uint16_t gFmPlayCountdown;
volatile int8_t   gFM_ScanState;
bool              gFM_AutoScan;
uint8_t           gFM_ChannelPosition;
bool              gFM_FoundFrequency;
bool              gFM_AutoScan;
uint8_t           gFM_ResumeCountdown;
uint16_t          gFM_RestoreCountdown;

bool FM_CheckValidChannel(uint8_t Channel)
{
	return (Channel < ARRAY_SIZE(gFM_Channels) && (gFM_Channels[Channel] >= 760 && gFM_Channels[Channel] < 1080)) ? true : false;
}

uint8_t FM_FindNextChannel(uint8_t Channel, uint8_t Direction)
{
	unsigned int i;

	for (i = 0; i < ARRAY_SIZE(gFM_Channels); i++)
	{
		Channel %= ARRAY_SIZE(gFM_Channels);
		if (FM_CheckValidChannel(Channel))
			return Channel;
		Channel += Direction;
	}

	return 0xFF;
}

int FM_ConfigureChannelState(void)
{
	gEeprom.FM_FrequencyPlaying = gEeprom.FM_SelectedFrequency;

	if (gEeprom.FM_IsMrMode)
	{
		const uint8_t Channel = FM_FindNextChannel(gEeprom.FM_SelectedChannel, FM_CHANNEL_UP);
		if (Channel == 0xFF)
		{
			gEeprom.FM_IsMrMode = false;
			return -1;
		}
		gEeprom.FM_SelectedChannel  = Channel;
		gEeprom.FM_FrequencyPlaying = gFM_Channels[Channel];
	}

	return 0;
}

void FM_TurnOff(void)
{
	gFmRadioMode         = false;
	gFM_ScanState        = FM_SCAN_OFF;
	gFM_RestoreCountdown = 0;

	GPIO_ClearBit(&GPIOC->DATA, GPIOC_PIN_AUDIO_PATH);

	gEnableSpeaker = false;

	BK1080_Init(0, false);

	gUpdateStatus  = true;
}

void FM_EraseChannels(void)
{
	unsigned int i;
	uint8_t      Template[8];

	memset(Template, 0xFF, sizeof(Template));
	for (i = 0; i < 5; i++)
		EEPROM_WriteBuffer(0x0E40 + (i * 8), Template);

	memset(gFM_Channels, 0xFF, sizeof(gFM_Channels));
}

void FM_Tune(uint16_t Frequency, int8_t Step, bool bFlag)
{
	GPIO_ClearBit(&GPIOC->DATA, GPIOC_PIN_AUDIO_PATH);

	gEnableSpeaker = false;

	gFmPlayCountdown = (gFM_ScanState == FM_SCAN_OFF) ? 120 : 10;

	gScheduleFM                 = false;
	gFM_FoundFrequency          = false;
	gAskToSave                  = false;
	gAskToDelete                = false;
	gEeprom.FM_FrequencyPlaying = Frequency;

	if (!bFlag)
	{
		Frequency += Step;
		if (Frequency < gEeprom.FM_LowerLimit)
			Frequency = gEeprom.FM_UpperLimit;
		else
		if (Frequency > gEeprom.FM_UpperLimit)
			Frequency = gEeprom.FM_LowerLimit;

		gEeprom.FM_FrequencyPlaying = Frequency;
	}

	gFM_ScanState = Step;

	BK1080_SetFrequency(gEeprom.FM_FrequencyPlaying);
}

void FM_PlayAndUpdate(void)
{
	gFM_ScanState = FM_SCAN_OFF;

	if (gFM_AutoScan)
	{
		gEeprom.FM_IsMrMode        = true;
		gEeprom.FM_SelectedChannel = 0;
	}

	FM_ConfigureChannelState();
	BK1080_SetFrequency(gEeprom.FM_FrequencyPlaying);
	SETTINGS_SaveFM();

	gFmPlayCountdown = 0;
	gScheduleFM      = false;
	gAskToSave       = false;

	GPIO_SetBit(&GPIOC->DATA, GPIOC_PIN_AUDIO_PATH);

	gEnableSpeaker   = true;
}

int FM_CheckFrequencyLock(uint16_t Frequency, uint16_t LowerLimit)
{
	int ret = -1;

	const uint16_t Test2 = BK1080_ReadRegister(BK1080_REG_07);

	// This is supposed to be a signed value, but above function is unsigned
	const uint16_t Deviation = BK1080_REG_07_GET_FREQD(Test2);

	if (BK1080_REG_07_GET_SNR(Test2) >= 2)
	{
		const uint16_t Status = BK1080_ReadRegister(BK1080_REG_10);
		if ((Status & BK1080_REG_10_MASK_AFCRL) == BK1080_REG_10_AFCRL_NOT_RAILED && BK1080_REG_10_GET_RSSI(Status) >= 10)
		{
			// if (Deviation > -281 && Deviation < 280)
			if (Deviation < 280 || Deviation > 3815)
			{
				// not BLE(less than or equal)

				if (Frequency > LowerLimit && (Frequency - BK1080_BaseFrequency) == 1)
				{
					if (BK1080_FrequencyDeviation & 0x800)
						goto Bail;

					if (BK1080_FrequencyDeviation < 20)
						goto Bail;
				}

				// not BLT(less than)

				if (Frequency >= LowerLimit && (BK1080_BaseFrequency - Frequency) == 1)
				{
					if ((BK1080_FrequencyDeviation & 0x800) == 0)
						goto Bail;

					// if (BK1080_FrequencyDeviation > -21)
					if (BK1080_FrequencyDeviation > 4075)
						goto Bail;
				}

				ret = 0;
			}
		}
	}

Bail:
	BK1080_FrequencyDeviation = Deviation;
	BK1080_BaseFrequency      = Frequency;

	return ret;
}

static void FM_Key_DIGITS(KEY_Code_t Key, bool bKeyPressed, bool bKeyHeld)
{
	#define STATE_FREQ_MODE 0
	#define STATE_MR_MODE   1
	#define STATE_SAVE      2

	if (!bKeyHeld && bKeyPressed)
	{
		if (!gWasFKeyPressed)
		{
			uint8_t State;

			if (gAskToDelete)
			{
				gBeepToPlay = BEEP_500HZ_60MS_DOUBLE_BEEP_OPTIONAL;
				return;
			}

			if (gAskToSave)
			{
				State = STATE_SAVE;
			}
			else
			{
				if (gFM_ScanState != FM_SCAN_OFF)
				{
					gBeepToPlay = BEEP_500HZ_60MS_DOUBLE_BEEP_OPTIONAL;
					return;
				}

				State = gEeprom.FM_IsMrMode ? STATE_MR_MODE : STATE_FREQ_MODE;
			}

			INPUTBOX_Append(Key);

			gRequestDisplayScreen = DISPLAY_FM;

			if (State == STATE_FREQ_MODE)
			{
				if (gInputBoxIndex == 1)
				{
					if (gInputBox[0] > 1)
					{
						gInputBox[1] = gInputBox[0];
						gInputBox[0] = 0;
						gInputBoxIndex = 2;
					}
				}
				else
				if (gInputBoxIndex > 3)
				{
					uint32_t Frequency;

					gInputBoxIndex = 0;
					NUMBER_Get(gInputBox, &Frequency);
					Frequency /= 10000;

					if (Frequency < gEeprom.FM_LowerLimit || gEeprom.FM_UpperLimit < Frequency)
					{
						gBeepToPlay           = BEEP_500HZ_60MS_DOUBLE_BEEP_OPTIONAL;
						gRequestDisplayScreen = DISPLAY_FM;
						return;
					}

					gEeprom.FM_SelectedFrequency = (uint16_t)Frequency;

					#ifndef DISABLE_VOICE
						gAnotherVoiceID = (VOICE_ID_t)Key;
					#endif

					gEeprom.FM_FrequencyPlaying = gEeprom.FM_SelectedFrequency;
					BK1080_SetFrequency(gEeprom.FM_FrequencyPlaying);
					gRequestSaveFM = true;
					return;
				}
			}
			else
			if (gInputBoxIndex == 2)
			{
				uint8_t Channel;

				gInputBoxIndex = 0;
				Channel = ((gInputBox[0] * 10) + gInputBox[1]) - 1;

				if (State == STATE_MR_MODE)
				{
					if (FM_CheckValidChannel(Channel))
					{
						#ifndef DISABLE_VOICE
							gAnotherVoiceID = (VOICE_ID_t)Key;
						#endif
						gEeprom.FM_SelectedChannel = Channel;
						gEeprom.FM_FrequencyPlaying = gFM_Channels[Channel];
						BK1080_SetFrequency(gEeprom.FM_FrequencyPlaying);
						gRequestSaveFM = true;
						return;
					}
				}
				else
				if (Channel < 20)
				{
					#ifndef DISABLE_VOICE
						gAnotherVoiceID = (VOICE_ID_t)Key;
					#endif
					gRequestDisplayScreen = DISPLAY_FM;
					gInputBoxIndex = 0;
					gFM_ChannelPosition = Channel;
					return;
				}

				gBeepToPlay = BEEP_500HZ_60MS_DOUBLE_BEEP_OPTIONAL;
				return;
			}

			#ifndef DISABLE_VOICE
				gAnotherVoiceID = (VOICE_ID_t)Key;
			#endif

			return;
		}

		gBeepToPlay           = BEEP_1KHZ_60MS_OPTIONAL;
		gWasFKeyPressed       = false;
		gUpdateStatus         = true;
		gRequestDisplayScreen = DISPLAY_FM;

		switch (Key)
		{
			case KEY_0:
				ACTION_FM();
				break;

			case KEY_1:
				gEeprom.FM_IsMrMode = !gEeprom.FM_IsMrMode;

				if (!FM_ConfigureChannelState())
				{
					BK1080_SetFrequency(gEeprom.FM_FrequencyPlaying);
					gRequestSaveFM = true;
				}
				else
					gBeepToPlay = BEEP_500HZ_60MS_DOUBLE_BEEP_OPTIONAL;
				break;

			case KEY_2:
				ACTION_Scan(true);
				break;

			case KEY_3:
				ACTION_Scan(false);
				break;

			default:
				gBeepToPlay = BEEP_500HZ_60MS_DOUBLE_BEEP_OPTIONAL;
				break;
		}
	}
}

static void FM_Key_EXIT(bool bKeyPressed, bool bKeyHeld)
{
	if (bKeyHeld)
		return;

	if (!bKeyPressed)
		return;

	gBeepToPlay = BEEP_1KHZ_60MS_OPTIONAL;

	if (gFM_ScanState == FM_SCAN_OFF)
	{
		if (gInputBoxIndex == 0)
		{
			if (!gAskToSave && !gAskToDelete)
			{
				ACTION_FM();
				return;
			}

			gAskToSave   = false;
			gAskToDelete = false;
		}
		else
		{
			gInputBox[--gInputBoxIndex] = 10;

			if (gInputBoxIndex)
			{
				if (gInputBoxIndex != 1)
				{
					gRequestDisplayScreen = DISPLAY_FM;
					return;
				}

				if (gInputBox[0] != 0)
				{
					gRequestDisplayScreen = DISPLAY_FM;
					return;
				}
			}

			gInputBoxIndex = 0;
		}

		#ifndef DISABLE_VOICE
			gAnotherVoiceID = VOICE_ID_CANCEL;
		#endif
	}
	else
	{
		FM_PlayAndUpdate();
		#ifndef DISABLE_VOICE
			gAnotherVoiceID = VOICE_ID_SCANNING_STOP;
		#endif
	}

	gRequestDisplayScreen = DISPLAY_FM;
}

static void FM_Key_MENU(bool bKeyPressed, bool bKeyHeld)
{
	if (bKeyHeld)
		return;

	if (!bKeyPressed)
		return;

	gRequestDisplayScreen = DISPLAY_FM;
	gBeepToPlay           = BEEP_1KHZ_60MS_OPTIONAL;

	if (gFM_ScanState == FM_SCAN_OFF)
	{
		if (!gEeprom.FM_IsMrMode)
		{
			if (gAskToSave)
			{
				gFM_Channels[gFM_ChannelPosition] = gEeprom.FM_FrequencyPlaying;
				gAskToSave                        = false;
				gRequestSaveFM                    = true;
			}
			else
				gAskToSave = true;
		}
		else
		{
			if (gAskToDelete)
			{
				gFM_Channels[gEeprom.FM_SelectedChannel] = 0xFFFF;

				FM_ConfigureChannelState();
				BK1080_SetFrequency(gEeprom.FM_FrequencyPlaying);

				gRequestSaveFM = true;
				gAskToDelete   = false;
			}
			else
				gAskToDelete = true;
		}
	}
	else
	{
		if (gFM_AutoScan || !gFM_FoundFrequency)
		{
			gBeepToPlay    = BEEP_500HZ_60MS_DOUBLE_BEEP_OPTIONAL;
			gInputBoxIndex = 0;
			return;
		}

		if (gAskToSave)
		{
			gFM_Channels[gFM_ChannelPosition] = gEeprom.FM_FrequencyPlaying;
			gAskToSave     = false;
			gRequestSaveFM = true;
		}
		else
			gAskToSave = true;
	}
}

static void FM_Key_UP_DOWN(bool bKeyPressed, bool bKeyHeld, int8_t Step)
{
	if (bKeyHeld || !bKeyPressed)
	{
		if (gInputBoxIndex)
			return;

		if (!bKeyPressed)
			return;
	}
	else
	{
		if (gInputBoxIndex)
		{
			gBeepToPlay = BEEP_500HZ_60MS_DOUBLE_BEEP_OPTIONAL;
			return;
		}

		gBeepToPlay = BEEP_1KHZ_60MS_OPTIONAL;
	}

	if (gAskToSave)
	{
		gRequestDisplayScreen = DISPLAY_FM;
		gFM_ChannelPosition   = NUMBER_AddWithWraparound(gFM_ChannelPosition, Step, 0, 19);
		return;
	}

	if (gFM_ScanState != FM_SCAN_OFF)
	{
		if (gFM_AutoScan)
		{
			gBeepToPlay = BEEP_500HZ_60MS_DOUBLE_BEEP_OPTIONAL;
			return;
		}

		FM_Tune(gEeprom.FM_FrequencyPlaying, Step, false);
		gRequestDisplayScreen = DISPLAY_FM;
		return;
	}

	if (gEeprom.FM_IsMrMode)
	{
		const uint8_t Channel = FM_FindNextChannel(gEeprom.FM_SelectedChannel + Step, Step);
		if (Channel == 0xFF || gEeprom.FM_SelectedChannel == Channel)
			goto Bail;

		gEeprom.FM_SelectedChannel  = Channel;
		gEeprom.FM_FrequencyPlaying = gFM_Channels[Channel];
	}
	else
	{
		uint16_t Frequency = gEeprom.FM_SelectedFrequency + Step;
		if (Frequency < gEeprom.FM_LowerLimit)
			Frequency = gEeprom.FM_UpperLimit;
		else
		if (Frequency > gEeprom.FM_UpperLimit)
			Frequency = gEeprom.FM_LowerLimit;

		gEeprom.FM_FrequencyPlaying  = Frequency;
		gEeprom.FM_SelectedFrequency = gEeprom.FM_FrequencyPlaying;
	}

	gRequestSaveFM = true;

Bail:
	BK1080_SetFrequency(gEeprom.FM_FrequencyPlaying);

	gRequestDisplayScreen = DISPLAY_FM;
}

void FM_ProcessKeys(KEY_Code_t Key, bool bKeyPressed, bool bKeyHeld)
{
	switch (Key)
	{
		case KEY_0:
		case KEY_1:
		case KEY_2:
		case KEY_3:
		case KEY_4:
		case KEY_5:
		case KEY_6:
		case KEY_7:
		case KEY_8:
		case KEY_9:
			FM_Key_DIGITS(Key, bKeyPressed, bKeyHeld);
			break;
		case KEY_MENU:
			FM_Key_MENU(bKeyPressed, bKeyHeld);
			return;
		case KEY_UP:
			FM_Key_UP_DOWN(bKeyPressed, bKeyHeld, 1);
			break;
		case KEY_DOWN:
			FM_Key_UP_DOWN(bKeyPressed, bKeyHeld, -1);
			break;;
		case KEY_EXIT:
			FM_Key_EXIT(bKeyPressed, bKeyHeld);
			break;
		case KEY_F:
			GENERIC_Key_F(bKeyPressed, bKeyHeld);
			break;
		case KEY_PTT:
			GENERIC_Key_PTT(bKeyPressed);
			break;
		default:
			if (!bKeyHeld && bKeyPressed)
				gBeepToPlay = BEEP_500HZ_60MS_DOUBLE_BEEP_OPTIONAL;
			break;
	}
}

void FM_Play(void)
{
	if (!FM_CheckFrequencyLock(gEeprom.FM_FrequencyPlaying, gEeprom.FM_LowerLimit))
	{
		if (!gFM_AutoScan)
		{
			gFmPlayCountdown   = 0;
			gFM_FoundFrequency = true;

			if (!gEeprom.FM_IsMrMode)
				gEeprom.FM_SelectedFrequency = gEeprom.FM_FrequencyPlaying;

			GPIO_SetBit(&GPIOC->DATA, GPIOC_PIN_AUDIO_PATH);
			gEnableSpeaker = true;

			GUI_SelectNextDisplay(DISPLAY_FM);
			return;
		}

		if (gFM_ChannelPosition < 20)
			gFM_Channels[gFM_ChannelPosition++] = gEeprom.FM_FrequencyPlaying;

		if (gFM_ChannelPosition >= 20)
		{
			FM_PlayAndUpdate();
			GUI_SelectNextDisplay(DISPLAY_FM);
			return;
		}
	}

	if (gFM_AutoScan && gEeprom.FM_FrequencyPlaying >= gEeprom.FM_UpperLimit)
		FM_PlayAndUpdate();
	else
		FM_Tune(gEeprom.FM_FrequencyPlaying, gFM_ScanState, false);

	GUI_SelectNextDisplay(DISPLAY_FM);
}

void FM_Start(void)
{
	gFmRadioMode         = true;
	gFM_ScanState        = FM_SCAN_OFF;
	gFM_RestoreCountdown = 0;

	BK1080_Init(gEeprom.FM_FrequencyPlaying, true);

	GPIO_SetBit(&GPIOC->DATA, GPIOC_PIN_AUDIO_PATH);

	gEnableSpeaker       = true;
	gUpdateStatus        = true;
}