#include "simplei2c.h"
#include <stdbool.h>

//adapted from https://github.com/lucasmaziero/LiquidCrystal_I2C

// 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

// flags for backlight control
#define LCD_BACKLIGHT 0x08
#define LCD_NOBACKLIGHT 0x00

#define En 0b00000100  // Enable bit
#define Rw 0b00000010  // Read/Write bit
#define Rs 0b00000001  // Register select bit

typedef struct {
  uint8_t _addr;
  uint8_t _displayfunction;
  uint8_t _displaycontrol;
  uint8_t _displaymode;
  uint8_t _cols;
  uint8_t _rows;
  uint8_t _charsize;
  uint8_t _backlightval;
  i2c* _i2cbus;
} LCD_I2C;

void LCD_init(LCD_I2C* lcd_i2c, i2c* i2cbus, uint8_t lcd_addr, uint8_t lcd_cols, uint8_t lcd_rows);
void LCD_initEx(LCD_I2C* lcd_i2c, i2c* i2cbus, uint8_t lcd_addr, uint8_t lcd_cols, uint8_t lcd_rows, uint8_t charsize);

void LCD_begin(LCD_I2C* lcd_i2c);

void LCD_clear(LCD_I2C* lcd_i2c);

void LCD_home(LCD_I2C* lcd_i2c);

void LCD_noDisplay(LCD_I2C* lcd_i2c);
void LCD_display(LCD_I2C* lcd_i2c);

void LCD_noBlink(LCD_I2C* lcd_i2c);
void LCD_blink(LCD_I2C* lcd_i2c);

void LCD_noCursor(LCD_I2C* lcd_i2c);
void LCD_cursor(LCD_I2C* lcd_i2c);

void LCD_scrollDisplayLeft(LCD_I2C* lcd_i2c);
void LCD_scrollDisplayRight(LCD_I2C* lcd_i2c);

//void LCD_printLeft(LCD_I2C* lcd_i2c);
//void LCD_printRight(LCD_I2C* lcd_i2c);

void LCD_leftToRight(LCD_I2C* lcd_i2c);
void LCD_rightToLeft(LCD_I2C* lcd_i2c);

//void LCD_shiftIncrement(LCD_I2C* lcd_i2c);
//void LCD_shiftDecrement(LCD_I2C* lcd_i2c);

void LCD_noBacklight(LCD_I2C* lcd_i2c);
void LCD_backlight(LCD_I2C* lcd_i2c);

bool LCD_getBacklight(LCD_I2C* lcd_i2c);

void LCD_autoscroll(LCD_I2C* lcd_i2c);
void LCD_noAutoscroll(LCD_I2C* lcd_i2c);

void LCD_createChar(LCD_I2C* lcd_i2c, uint8_t location, uint8_t charmap[]);

void LCD_setCursor(LCD_I2C* lcd_i2c, uint8_t col, uint8_t row);

int LCD_write(LCD_I2C* lcd_i2c, uint8_t value);

void LCD_command(LCD_I2C* lcd_i2c, uint8_t value);

void LCD_blink_on(LCD_I2C* lcd_i2c);
void LCD_blink_off(LCD_I2C* lcd_i2c);

void LCD_cursor_on(LCD_I2C* lcd_i2c);
void LCD_cursor_off(LCD_I2C* lcd_i2c);

void LCD_setBacklight(LCD_I2C* lcd_i2c, uint8_t new_val);

void LCD_load_custom_character(LCD_I2C* lcd_i2c, uint8_t char_num, uint8_t *rows);

void LCD_printstr(LCD_I2C* lcd_i2c, const char[]);