#ifndef LiquidCrystal_h
#define LiquidCrystal_h

#include "DigitalIoPin.h"
#include "chip.h"
#include <cstddef>
#include <string>


// commands
#define LCD_CLEARDISPLAY 0x01
#define LCD_RETURNHOME 0x02
#define LCD_ENTRYMODESET 0x04
#define LCD_DISPLAYCONTROL 0x08
#define LCD_CURSORSHIFT 0x10
#define LCD_FUNCTIONSET 0x20
#define LCD_SETCGRAMADDR 0x40
#define LCD_SETDDRAMADDR 0x80

// flags for display entry mode
#define LCD_ENTRYRIGHT 0x00
#define LCD_ENTRYLEFT 0x02
#define LCD_ENTRYSHIFTINCREMENT 0x01
#define LCD_ENTRYSHIFTDECREMENT 0x00

// flags for display on/off control
#define LCD_DISPLAYON 0x04
#define LCD_DISPLAYOFF 0x00
#define LCD_CURSORON 0x02
#define LCD_CURSOROFF 0x00
#define LCD_BLINKON 0x01
#define LCD_BLINKOFF 0x00

// flags for display/cursor shift
#define LCD_DISPLAYMOVE 0x08
#define LCD_CURSORMOVE 0x00
#define LCD_MOVERIGHT 0x04
#define LCD_MOVELEFT 0x00

// flags for function set
#define LCD_8BITMODE 0x10
#define LCD_4BITMODE 0x00
#define LCD_2LINE 0x08
#define LCD_1LINE 0x00
#define LCD_5x10DOTS 0x04
#define LCD_5x8DOTS 0x00

class LiquidCrystal
{
public:
  LiquidCrystal (DigitalIoPin *rs, DigitalIoPin *enable, DigitalIoPin *d0,
                 DigitalIoPin *d1, DigitalIoPin *d2, DigitalIoPin *d3);

  void begin (uint8_t cols, uint8_t rows, uint8_t charsize = LCD_5x8DOTS);

  void clear ();
  void home ();

  void noDisplay ();
  void display ();
  void noBlink ();
  void blink ();
  void noCursor ();
  void cursor ();
  void scrollDisplayLeft ();
  void scrollDisplayRight ();
  void leftToRight ();
  void rightToLeft ();
  void autoscroll ();
  void noAutoscroll ();

  void createChar (uint8_t, uint8_t[]);
  void setCursor (uint8_t, uint8_t);
  virtual size_t write (uint8_t);
  void command (uint8_t);
  void print (std::string const &s);
  void print (const char *s);

private:
  void send (uint8_t, uint8_t);
  void write4bits (uint8_t);
  void pulseEnable ();

  DigitalIoPin *rs_pin;     // LOW(false): command.  HIGH(true): character.
  DigitalIoPin *enable_pin; // activated by a HIGH pulse.
  DigitalIoPin *data_pins[4];

  uint8_t _displayfunction;
  uint8_t _displaycontrol;
  uint8_t _displaymode;

  uint8_t _initialized;

  uint8_t _numlines, _currline;
  uint8_t rows, col;
};

#endif