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#ifndef _DISPLAY_HPP
#define _DISPLAY_HPP

#include <stdint.h>
#include <stddef.h>
#include <string>

namespace mbed { class I2C; }

/// Interface to the Newhaven Display NHD-C0220BiZ-FS(RGB)-FBW-3VM LCD module
/// and MAX7306 PWM LED driver for backlight color selection.
class Display
{
public:
  /// Display line referenced from top
  enum Line
  {
    FirstLine = 0,
    SecondLine
  };
  
  /// 24-bit RGB color for the backlight.
  struct Color
  {
    uint8_t R, G, B;
    Color(uint8_t R, uint8_t G, uint8_t B)
      : R(R), G(G), B(B) { }
  };
  
  /// Length in character os a display line.
  static const size_t lineLength = 20;
  
  /// @param I2C_interface A configured I2C interface to use for communication.
  /// @param LCD_I2C_address LCD module bus address in mbed format.
  /// @param LED_driver_I2C_addr PWM LED driver (MAX7306) bus address in mbed format.
  Display(mbed::I2C & I2C_intf, uint8_t LCD_I2C_addr, uint8_t LED_driver_I2C_addr);
  
  /// Initialize display components.
  void initialize(void);
  
  /// Clear all display lines.
  void clearDisplay(void);
  
  /// Clear a specific display line.
  void clearLine(Line line);
  
  /// Write a single character to the display at the current cursor position.
  void writeCharacter(uint8_t character);
  
  /// Write text to the display at the current cursor position.
  void writeText(const std::string & text);
  
  /// Set cursor to a certain line and zero-index position within the line.
  void setCursorPosition(Line line, size_t position = 0);
  
  /// Writes text to the display starting at the beginning of the line.
  void writeLine(const std::string & text, Line line);
  
  /// Writes text to the display starting at the beginning of the line and clears the remainder of the line.
  void writeCompleteLine(const std::string & text, Line line);
  
  // Writes a message to the display with text wrapping allowed at spaces.
  void writeMessage(const std::string & text);

  // Set the display backlight to a certain color.
  void setBackLightColor(const Color & color);
  
private:  
  mbed::I2C & m_I2C_intf;
  uint8_t m_LCD_I2C_addr, m_LED_driver_I2C_addr;
  
  void initializeLCD(void);
  void initializeLED_Driver(void);
};

#endif