#pragma once
#include <stdint.h>

class AVRInterface {
public:
	/// @brief 
	/// @param SendMessage is the function this AVRInterface calls to send a message to the device
	/// 
	AVRInterface(bool (*SendMessage)(const uint8_t *buffer, uint16_t len));
	
	~AVRInterface();

	/// @brief When the system receives something from the device, give it to this function to handle it
	/// @param buffer 
	/// @param len 
	/// @return true if it was handled 
	/// 
	bool HandleMessage(const uint8_t *buffer, uint16_t len);

	/// @brief Call this periodically so timed activities can be handled.
	/// 
	/// Every 1 or even 50 to 100 msec is ok.
	/// 
	/// @param millisec 
	/// 
	void Tick(uint32_t millisec);

	/// @brief Initialize the AVR interface and issue the ready command.
	/// 
	/// This is temporarily blocking since nothing else should run until ready
	/// 
	/// @return true if initialized
	/// 
	bool Initialize();

	/// @brief determine if the device is ready
	/// 
	/// @return true if ready
	/// 
	bool IsOnline();

	typedef enum {
		eOn = 0,
		eOff,
		eStandby
	} AVROnOff_E;

	typedef enum {
		eUp,
		eDown,
	} AVRUpDown_E;

	typedef enum {
		eMuteOn,
		eMuteOff
	} AVRMute_E;

	typedef enum {
		eOSDOff,
		eOSDShort,
		eOSDFull
	} AVROSDScreen_E;

	typedef enum {
		eSleepOff,
		eSleep120,
		eSleep90,
		eSleep60,
		eSleep30
	} AVRSleep_E;

	typedef enum {
		eOnMatrix,
		eESESOff,
		eAuto,
		eDiscrete
	} AVREX_ES_E;

	typedef enum {
		eEffectOn,	
		eStereo
	} AVREffect_E;

	typedef enum {
		eFM,
		eAM
	} AVRTunerBand_E;

	typedef enum {
		e1,
		e2,
		e3,
		e4,
		e5,
		e6, 
		e7, 
		e8
	} AVRPresetNum_E;

	typedef enum {
		eA,
		eB,
		eC,
		eD,
		eE,
		eF
	} AVRPresetPage_E;

	typedef enum {
		ePhono,
		eCD,
		eTuner,
		eCDR,
		eMD_Tape,
		eDVD,
		eDTV,
		eCable,
		eSat,
		eVCR1,
		eVCR2_DVR,
		eVCR3,
		eV_Aux,
	} AVRInput_E;

	typedef enum {
		eMain,
		eZone1,
		eZone2,
		eZone3,
		eZoneOR
	} AVRSubsystem_E;

	typedef enum {
		Hall_A,
		Hall_B,
		Hall_C,
		Hall_USA,
		Hall_E,
		Live_Concert,
		Tokyo,
		Freiburg,
		Royaumont,
		Village_Gate,
		Village_Vanguard,
		The_Bottom_Line,
		The_Roxy_Theater,
		Warehouse_Loft,
		Arena,
		Disco,
		Party,
		Game,
		Stereo_6_8Ch,
		Pop_Rock,
		DJ,
		Opera,
		Pavillion,
		Mono_Movie,
		Variety_Sports,
		Spectacre,
		Sci_Fi,
		Adventure,
		General,
		Normal,
		Enhanced,
		PLII_Movie,
		PLII_Music,
		Neo_6_Movie,
		Neo_6_Music,
		Direct_2Ch,
		Stereo_2Ch, 
		THX_Ultra_PL,
		THX_Music,
		THX_Ultra_PL2,
		THX_Ultra_NEO6
	} AVRDSPProg_E;			 

	typedef enum {
		eInpAuto,
		eDD_RF,
		eDTS,
		eDigital,
		eAnalog,
		eAAC
	} AVRInputMode_E;

	typedef enum {
		eDualMain,
		eDualSub,
		eDualAll
	} AVRDualMono_E;

	typedef enum {
		fncPower,
		fncVolume,
		fncMute,
		fncVolumeMemory,
		fncVolumeRecall,
		fncSpeakerAOnOff,
		fncSpeakerBOnOff,
		fncSpeakerBZone,
		fncZone2SpeakerOnOff,
		fncNightModeOnOff,
		fncEffect,
		fncInput,
		fncRadioBand,
		fncRadioTune,
		fncRadioPresetPage,
		fncRadioPresetNumber,
		fncRadioPresetMemory,
		fncRadioPresetRecall,
		fncDSPProgram,
		fncSleep,
		fncOSD,
		fnc6ChInput,
		fncEx_EsOnOff,
		fncInputMode,
		fncDualMono,
		fncDC1TrigControl,
		fncDC2TrigControl,
		fncDC1OnOff,
		fncDC2OnOff,
	} AVRFunction_E;

	typedef union {
		AVROnOff_E onOff;
		AVRUpDown_E volume;
		AVRMute_E mute;
		AVRPresetPage_E volumeMemory;
		AVRPresetPage_E volumeRecall;
		AVROnOff_E speakerA;
		AVROnOff_E speakerB;
		AVRSubsystem_E speakerBZone;
		AVROnOff_E zone2Speaker;
		AVROnOff_E nightMode;
		AVRInput_E input;
		AVRTunerBand_E band;
		AVRUpDown_E tune;
		AVRPresetPage_E presetPage;
		AVRPresetNum_E presetNumber;
		AVRPresetPage_E presetMemory;
		AVRPresetPage_E presetRecall;
		AVRDSPProg_E program;
		AVRSleep_E sleep;
		AVROSDScreen_E osd;
		AVROnOff_E sixChInput;
		AVREX_ES_E ex_es;
		AVRInputMode_E inputMode;
		AVRDualMono_E dualMono;
		AVRSubsystem_E dc1TrigControl;
		AVRSubsystem_E dc2TrigControl;
		AVROnOff_E dc1OnOff;
		AVROnOff_E dc2OnOff;
		char *pMessage;
	} AVRArgument_UX;

	typedef uint32_t AVRArg_T;

	/// @brief The single command path to control the AVR
	/// 
	/// This lets you send a command to the AVR using this single interface, by choosing
	/// the AVR Subsystem of interest, the Function of interest, and passing an argument.
	/// 
	/// @param[in] subsystem: Main | Zone 1 | Zone 2 | Zone 3
	/// @param[in] function : Power, Speaker, Volume, etc.
	/// @param[in] arg: on/off, etc.
	/// @return 
	bool AVRCommand(AVRInterface::AVRSubsystem_E subsystem,
		AVRInterface::AVRFunction_E function,
		AVRArg_T arg);

	/// @brief Send the power command
	/// @param cmd 
	/// @return true
	/// 
	bool Power(AVROnOff_E cmd);
	bool VolumeButton(AVRUpDown_E cmd);

	/// @brief AVRMessageType_T
	///
	///	Indicates the type of message being sent to the status change callback
	/// 
	typedef enum {
		mtModelInfo,	///<! Model information
		mtStatus,		///<! Special State machine status (possibly useful in a dedicate place on the UI)
		mtInfo,			///<! General purpose information (chunks of information that might be useful in a small scroll region)
		mtStreamStart,	///<! Stream start of the status, each chunk is a generally a same-length string, totaling 100s of bytes.
		mtStream,		///<! Status stream that word-wraps...
	} AVRMessageType_T;

	/// @brief StatusChangeCallback
	///
	/// This is the function prototype for the status change callback from the AVR interface.
	/// This can be used to interpret, or more commonly to display, various types of status information.
	/// 
	/// @param[in] type is the type of message being sent
	/// @param[in] msg is the text message
	/// 
	typedef void (*StatusChangeCallback)(AVRMessageType_T type, const char *msg);

	/// @brief allows the host to register a callback for status changes
	/// 
	/// the callback information is always text
	/// 
	/// @param[in] cb is the callback function, or register NULL to unregister
	/// @return true always
	/// 
	bool RegisterInformationCallback(StatusChangeCallback cb);

	/// ReportAllStatus
	/// 
	/// @brief This will loop through the DT array and report the status of everything via the registered callback
	///
	void ReportAllStatus();

	/// ProcessSerialQueue
	/// 
	/// @brief This is public to start, maybe forever because it offers the generic capability
	/// @param[in] p the message to send
	/// @param[in] len of the message
	/// @return true
	/// 
	bool ProcessSerialQueue(const void *p = NULL, uint16_t len = NULL);

	/// AVRSendOSDMessage
	/// 
	/// @brief Send a text message to the AVR for display on the connected TV
	/// @param[in] msg is a text string, which must not exceed 16 characters in length, is null terminated
	///				and is restricted to the following characters:
	///				" !#%&()*+,-.0123456789:<=>?ABCDEFGHIJKLMNOPQRSTUVWXYZ[]_abcdefghijklmnopqrstuvwxyz"
	/// @return true if the message was accepted for sending, false if it is too long or has invalid characters.
	/// 
	bool AVRSendOSDMessage(const char *msg);

private:
	uint32_t sentAtTime_ms;

	typedef enum {
		stPoweringUp,
		stAwaitingReadyResponse,
		stInitializing,
		stRetryInitializing,
		stReady,
		stAwaitingResponse,
		stMaxStates
	} AVRState_T;
	AVRState_T state = stPoweringUp;
	AVRState_T oldState = stMaxStates;

	AVRState_T GetState() {
		return state;
	}

	// Each DT is the hex-character from the stream
	//
	// This could be simplified to uint8_t DT[138]
	//
	typedef struct {
		uint8_t DT0;	// * Baud Rate		 '@'
		uint8_t DT1;	// * Receive Buffer  'E'
		uint8_t DT2;	// * Receive Buffer  '0'
		uint8_t DT3;	// *                 '1'
		uint8_t DT4;	// * Command Timeout '9'
		uint8_t DT5;	// *                 '0'
		uint8_t DT6;	// *                 '0'
		uint8_t DT7;	// * System          '0':Ok, '1':Busy
		uint8_t DT8;	// * Power            0:Off, 1:On
		uint8_t DT9;	// Input      0: Phono, 1:CD, 2:Tuner, 3:CD-R, 4:MD-Tape, 5:DVD, 6:D-TV, 7:Cbl, 9:VCR1, A:VCR2
		uint8_t DT10;	// 6ch input 0:Off, 1:On
		uint8_t DT11;	// Input Mode 0:AUTO, 2:DTS, 4:Analog, 5:Analog Only
		uint8_t DT12;	// Audio Mute 0:Off, 1:On
		uint8_t DT13;	// Zone2 Input 0: PHONO / 1: CD / 2: TUNER / 3: CD-R / 4: MD-TAPE / 5: DVD / 6: D-TV-LD / 7: CBL-SAT / 9: VCR1 / A: VCR2-DVR / C: V-AUX
		uint8_t DT14;	// Zone2 Mute 0: OFF / 1: ON
		uint8_t DT15;	// Master Volume Upper 4 bit
		uint8_t DT16;	// Master Volume Lower 4 bit
		uint8_t DT17;	// Zone2 Volume Upper 4 bit
		uint8_t DT18;	// Zone2 Volume Lower 4 bit
		uint8_t DT19;	// Program Upper 4 bit
		uint8_t DT20;	// Program Lower 4 bit
		uint8_t DT21;	// Effect 0: OFF / 1: ON
		uint8_t DT22;	// 6.1/ES key status 0: OFF / 1: MATRIX ON / 2: DISCRETE ON / 3: AUTO
		uint8_t DT23;	// OSD* 0: FULL / 1: SHORT / 2: OFF
		uint8_t DT24;	// Sleep 0: 120 / 2: 90 / 3: 60 / 4: 30 / 5: OFF
		uint8_t DT25;	// Tuner Page 0: Page A / 1: Page B / 2: Page C / 3: Page D / 4: PageE
		uint8_t DT26;	// Tuner No. 0: No.1 / 1: No.2 / 2: No.3 / 3: No.4 / 4: No.5 / 5: No.6 / 6: No.7 / 7: No.8
		uint8_t DT27;	// Night mode 0: OFF / 1: ON
		uint8_t DT28;	// Care
		uint8_t DT29;	// Speaker relay A 0: OFF / 1: ON
		uint8_t DT30;	// Speaker relay B 0: OFF / 1: ON
		uint8_t DT31;	// Playback 0: 6ch input / 1: Analog / 2: PCM / 3: DD*(except 2.0) / 4: DD(2.0) / 5: DD.Karaoke / 6: DD.EX / 7: DTS / 8: DTS-ES / 9: Other DIGITAL / A: DTS Analog Mute / B: DTS ES Discrete
		uint8_t DT32;	// Fs 0: Analog / 1: 32kHz / 2: 44.1kHz / 3: 48kiHz / 4: 64kHz / 5: 88.2kHz / 6: 96kHz / 7: Unknown B: DTS 96/24
		uint8_t DT33;	// EX/ES playback 0: OFF / 1: MATRIX ON / 2: DISCRETE ON
		uint8_t DT34;	// Thr / Bypass 0: Normal / 1: Bypass
		uint8_t DT35;	// RED dts 0: Release / 1: Wait
		uint8_t DT36;	// Head Phone 0: OFF / 1: ON
		uint8_t DT37;	// TUNER BAND 0: FM / 1: AM
		uint8_t DT38;	// TUNER TUNED 0: NOT TUNED / 1: TUNED
		uint8_t DT39;	// DC1 Control Out 0: LOW / 1: HIGH

		uint8_t DT40;	 // Don’t care
		uint8_t DT41;	 // Don't Care
		uint8_t DT42;	 // 0-2 DC1 TRG Ctrl. 0: Zone1 / 1: Zone2 / 2: Zone1&2
		uint8_t DT43;	 // 0/1 dts 96/24 0: OFF / 1: ON
		uint8_t DT44;	 // 0-2 DC2 TRG Ctrl. 0: Zone1 / 1: Zone2 / 2: Zone1&2
		uint8_t DT45;	 // 0/1 DC2 Trigger 0: LOW / 1: HIGH
		uint8_t DT46;	 // SP B set 0: Zone1 / 1: Zone2
		uint8_t DT47;	 // Zone 2 SP out 0: OFF / 1: ON
		uint8_t DT48;	 // MAIN R Upper 4bit
		uint8_t DT49;	 // Lower 4bit
		uint8_t DT50;	 // MAIN L Upper 4bit
		uint8_t DT51;	 // Lower 4bit
		uint8_t DT52;	 // CENTER Upper 4bit
		uint8_t DT53;	 // Lower 4bit
		uint8_t DT54;	 // REAR R Upper 4bit
		uint8_t DT55;	 // Lower 4bit
		uint8_t DT56;	 // REAR L Upper 4bit
		uint8_t DT57;	 // Lower 4bit
		uint8_t DT58;	 // SUR BACK Upper 4bit
		uint8_t DT59;	 // R Lower 4bit
		uint8_t DT60;	 // SUR BACK Upper 4bit
		uint8_t DT61;	 // L Lower 4bit
		uint8_t DT62;	 // FRONT R Upper 4bit
		uint8_t DT63;	 // Lower 4bit
		uint8_t DT64;	 // FRONT L Upper 4bit
		uint8_t DT65;	 // Lower 4bit
		uint8_t DT66;	 // SWFR 1 Upper 4bit
		uint8_t DT67;	 // Lower 4bit
		uint8_t DT68;	 // Don't Care
		uint8_t DT69;	 // Don't Care
		uint8_t DT70;	 // Don't Care
		uint8_t DT71;	 // Don't Care
		uint8_t DT72;	 // Don't Care
		uint8_t DT73;	 // Don't Care
		uint8_t DT74;	 // LFE Lvl. SP Upper 4bit
		uint8_t DT75;	 // Lower 4bit
		uint8_t DT76;	 // LFE Lvl. HP Upper 4bit
		uint8_t DT77;	 // Lower 4bit
		uint8_t DT78;	 // Audio Delay Upper 4bit
		uint8_t DT79;	 // Lower 4bit

		uint8_t DT80;	// Don't Care
		uint8_t DT81;	// Don't Care
		uint8_t DT82;	// Don't Care
		uint8_t DT83;	// Don't Care
		uint8_t DT84;	// Input mode set 0: AUTO / 1: LAST
		uint8_t DT85;	// Dimmer 0: -4 / 1: -3 / 2: -2 / 3: -1 / 4: 0
		uint8_t DT86;	// OSD Message
		uint8_t DT87;	// OSD shift Upper 4bit
		uint8_t DT88;	// Lower 4bit
		uint8_t DT89;	// Glay back 0: OFF / 1: AUTO
		uint8_t DT90;	// Video conversion 0: OFF / 1: ON
		uint8_t DT91;	// D. Range SP 0: MAX / 1: STD / 2: MIN
		uint8_t DT92;	// HP 0: MAX / 1: STD / 2: MIN
		uint8_t DT93;	// Zone 2 vol. Out
		uint8_t DT94;	// Don't Care
		uint8_t DT95;	// Memory guard 0: OFF / 1: ON
		uint8_t DT96;	// SP set Center 0: Large / 1: Small / 2: None
		uint8_t DT97;	// Main 0: Large / 1: Small
		uint8_t DT98;	// Rear L/R 0: Large / 1: Small / 2: None
		uint8_t DT99;	// Rear CT 0: Large / 1: Small / 2: None
		uint8_t DT100;	// Front 0: Yes / 1: None
		uint8_t DT101;	// LFE/BASS 0: SWFR / 1: Main / 2: Both
		uint8_t DT102;	// 6CH Center 0: Center / 1: Main
		uint8_t DT103;	// SWFR 0: SWFR / 1: Main
		uint8_t DT104;	// Main level 0: Normal / 1: -10dB
		uint8_t DT105;	// Test mode 0: OFF / 1: Dolby / 2: DTS
		uint8_t DT106;	// Don't Care
		uint8_t DT107;	// LVL 6CH MAIN L Upper 4bit
		uint8_t DT108;	// Lower 4bit
		uint8_t DT109;	// MAIN R Upper 4bit
		uint8_t DT110;	// Lower 4bit
		uint8_t DT111;	// CENTER Upper 4bit
		uint8_t DT112;	// Lower 4bit
		uint8_t DT113;	// SL Upper 4bit
		uint8_t DT114;	// Lower 4bit
		uint8_t DT115;	// SR Upper 4bit
		uint8_t DT116;	// Lower 4bit
		uint8_t DT117;	// SBL Upper 4bit
		uint8_t DT118;	// Lower 4bit
		uint8_t DT119;	// SBR Upper 4bit
		uint8_t DT120;	// Lower 4bit
		uint8_t DT121;	// FRONT L Upper 4bit
		uint8_t DT122;	// Lower 4bit
		uint8_t DT123;	// FRONT R Upper 4bit
		uint8_t DT124;	// Lower 4bit
		uint8_t DT125;	// SWFR Upper 4bit
		uint8_t DT126;	// Lower 4bit
		uint8_t DT127;	// 0 - C Z3 Input
		uint8_t DT128;	// 0/1 Z3 Mute
		uint8_t DT129;	// 0 - F Z3 Volume Upper 4bit

		uint8_t DT130;	// 0 - F Lower 4bit
		uint8_t DT131;	// Don't Care
		uint8_t DT132;	// MULTI_CH SELECT 00:6CH / 01:8CH TUNER / 02: 8CH CD / 04: 8CH CD-R / 05: 8CH DVD / 06: DTV / 07: 8CH CBL/SAT / 09: 8CH VCR1 / 0A: VCR2/DVR / 0C: VAUX
		uint8_t DT133;	// MULTI_CH SURROUND to 00: Surround / 01: Main
		uint8_t DT134;	// SP SET SW1 00: L-R / 01: F-R / 02: NONE
		uint8_t DT135;	// SP SET CROSSOVER 00: 40Hz / 01: 60Hz / 02: 80Hz / 03: 90Hz / 04: 100Hz / 05: 110Hz / 06: 120Hz / 07: 160Hz / 08: 200Hz
		uint8_t DT136;	// COMPONENT OSD 00: OFF / 01: ON
		uint8_t DT137;	// PB/SB SELECT 00: PR / 01: SB

		uint8_t DT138[100];	// From here on is just buffer in case it sends more data
	} AVR_Configuration_T;

	typedef struct {
		uint8_t type[5];	// Model ID
		uint8_t version;	// A-Z
		uint8_t length[2];	// 1 - 255
	} AVR_StatusHeader_T;

	typedef struct {
		bool headerValid;
		bool configValid;
		AVR_StatusHeader_T header;
		AVR_Configuration_T config;

	} AVR_Status_T;

	//AVR_StatusHeader_T avrStatusHeader;
	//AVR_Configuration_T avrConfigData;
	AVR_Status_T avrStatus;
	bool commandResponseReceived; // a response to the last command was received
	bool readyResponsReceived;	// the special system ready response was received
	int readyTries;
	#define RETRY_INTERVAL_ms 500
	#define MAXTRIES 5

	#define SERIALQUEUESIZE 5
	typedef struct {
		uint8_t *messageToSend;
		uint16_t len;
	} SerialQueue_T;

	SerialQueue_T serialQueue[SERIALQUEUESIZE];
	int serialQueueCount = 0;

	bool bFirstTickInitialized;
	uint32_t firstTick_ms;	// basically the time when the program started
	uint32_t lastTick_ms;	// @TODO instead of this, offer a way for the class to get the current time


	bool IsSanityCheckOK();
	void MessageHandlerSanityCheck();
	
	// host provided method to send to the AVR
	bool (*SendMethod)(const uint8_t *buffer, uint16_t bufferSize);

	// host provided method to update the user with a text message
	void(*ReportInformation)(AVRMessageType_T type, const char * message);

	void PCMessage(const char *msg, int len, uint8_t **src, const char *(fncHelper)(uint8_t val) = NULL);
	bool ProcessReportResponse(const uint8_t *szBuffer, uint32_t len);
	void MessageReport(const char *prefix, const void *buf, size_t len = 0);

	bool CheckTheChecksum(const uint8_t *szBuffer, uint32_t num);
	uint16_t Hex2Dec(const uint8_t *p, int dig);

	void FreeMemory();
};