// Display (Crystalfontz CFA-635 USB LCD)
//
// Douglas Thrift
//
// $Id$

#ifndef _Display_hpp_
#define _Display_hpp_

#include <posix.hpp>
#include <truck.hpp>

#include <queue>

class Display
{
	int ucom;
	struct Packet
	{
		enum Command
		{
			PingCommand								= 0x00,
			GetHardwareAndFirmwareVersion			= 0x01,
			WriteUserFlashArea						= 0x02,
			ReadUserFlashArea						= 0x03,
			StoreCurrentStateAsBootState			= 0x04,
			RebootResetHostOrPowerOffHost			= 0x05,
			ClearLCDScreen							= 0x06,
			SetLCDSpecialCharacterData				= 0x09,
			Read8ByesOfLCDMemory					= 0x0a,
			SetLCDCursorPosition					= 0x0b,
			SetLCDCursorStyle						= 0x0c,
			SetLCDContrast							= 0x0d,
			SetLCDAndKeypadBacklight				= 0x0e,
			SetUpFanReporting						= 0x10,
			SetFanPower								= 0x11,
			ReadDOWDeviceInformation				= 0x12,
			SetUpTemperatureReporting				= 0x13,
			ArbitraryDOWTransaction					= 0x14,
			SendCommandDirectlyToTheLCDController	= 0x16,
			ConfigureKeyReporting					= 0x17,
			ReadKeypad								= 0x18,
			SetFanPowerFailSafe						= 0x19,
			SetFanTachometerGlitchFilter			= 0x1a,
			QueryFanPowerAndFailSafeMask			= 0x1b,
			SetATXPowerSwitchFunctionality			= 0x1c,
			EnableDisableAndResetTheWatchdog		= 0x1d,
			ReadReportingAndStatus					= 0x1e,
			SendDataToLCD							= 0x1f,
			SetBaudRate								= 0x21,
			SetOrSetAndConfigureGPIOPin				= 0x22,
			ReadGPIOPinLevelsAndConfigurationState	= 0x23,
			Response								= 0x40,
			KeyActivity								= 0x80,
			FanSpeedReport							= 0x81,
			TemperatureSensorReport					= 0x82,
			Error									= 0xc0,
		};

		uint8_t command;
		uint8_t length;
		uint8_t data[22];
		uint16_t crc;

		inline Packet() {}
		Packet(Command command, uint8_t length, const uint8_t *data);

		inline std::string GetData() { return std::string(reinterpret_cast<char *>(data), length); }
	};
	std::queue<Packet> keyActivity;

	Packet Communicate(Packet::Command command, uint8_t length = 0, const uint8_t *data = NULL);
	inline Packet Communicate(Packet::Command command, const std::string &data) { return Communicate(command, data.size(), reinterpret_cast<const uint8_t *>(data.data())); }

public:
	enum CursorStyle
	{
		NoCursor,
		BlinkingBlockCursor,
		UnderscoreCursor,
		BlinkingBlockPlusUnderscore,
		InvertingBlinkingBlock
	};
	enum Key
	{
		Up		= 0x01,
		Enter	= 0x02,
		Cancel	= 0x04,
		Left	= 0x08,
		Right	= 0x10,
		Down	= 0x20,
	};

	Display(const std::string &device);
	~Display() { Posix::Close(ucom); }

	bool Ping(const std::string &data = std::string());
	std::string Version();
	inline void Store() { Communicate(Packet::StoreCurrentStateAsBootState); }
	inline void Clear() { Communicate(Packet::ClearLCDScreen); }
	void SetCursorPosition(uint8_t column, uint8_t row);
	void SetCursorStyle(CursorStyle style);
	inline void SetContrast(uint8_t contrast) { Communicate(Packet::SetLCDContrast, 1, &contrast); }
	inline void SetBacklight(uint8_t backlight) { Communicate(Packet::SetLCDAndKeypadBacklight, 1, &backlight); }
	inline void KeyReporting(uint8_t press, uint8_t release);
};

#endif//_Display_hpp_