#ifndef __SSD1306_H__
#define __SSD1306_H__

#include <driver/spi_master.h>
#include "fonts.h"


#define READ_BIT   I2C_MASTER_READ              /*!< I2C master read */

#define ACK_CHECK_DIS  0x0                      /*!< I2C master will not check ack from slave */
#define ACK_VAL    0x0                          /*!< I2C ack value */
#define NACK_VAL   0x1                          /*!< I2C nack value */

// Fundamental Command (page 28)
#define DISPLAY_LINE_START 0x40
#define CONTRAST_CONTROL 0x81
#define DISABLE_ENTIRE_DISPLAY 0xA4
#define DISPLAY_ON_REG02 0xA5
#define NORMAL_DISPLAY 0xA6
#define DISPLAY_INVERSE  0xA7
#define DISPLAY_RESET 0xAE
#define DISPLAY_ON 0xAF

// Addressing Setting (page 30)
#define MEM_ADDR_MODE 0x20
#define LOWER_COL_START_ADDR 0x00
#define HIGHER_COL_START_ADDR 0x10
#define PAGE_START_ADDR 0xB0

// Hardware Config (page 31)
#define DISPLAY_START_LINE 0x40
#define SEGMENT_REMAP 0xA0
#define SEGMENT_REMAP_FLIP 0xA1
#define MULTIPLEX_RATIO 0xA8
#define COM_OUTPUT_SCAN_DIR 0xC0
#define DISPLAY_OFFSET 0xD3
#define COM_PINS_HARDWARE_CONFIG 0xDA

// Timing & Driving Scheme (page 32)
#define DISPLAY_CLK_RATIO 0xD5
#define PRE_CHARGE_PER 0xD9
#define VCOMH_DESELECT_LEVEL 0xDB
#define NOOPERATION 0xE3

// Charge Pump (page 60)
#define CHARGE_PUMP_SET 0x8D

// Scrolling
#define DEACTIVATE_SCROLL 0x2E
#define ACTIVATE_SCROLL 0x2F
#define VERTICAL_AND_RIGHT_HOR_SCROLL 0x29
#define DUMMY_BYTE 0x00
#define SIX_FRAMES_PER_SEC 0x00
#define VERTICAL_OFFSET_ONE 0x01

typedef enum {
	SSD1306_COLOR_BLACK = 0x00, /*!< Black color, no pixel */
	SSD1306_COLOR_WHITE = 0x01  /*!< Pixel is set. Color depends on LCD */
} SSD1306_COLOR_t;



#define SSD1306_WIDTH            128
#define SSD1306_HEIGHT           64


esp_err_t oled_ssd1306_init();
void SSD1306_Clear();
void SSD1306_DrawVertLine(const uint8_t y, const uint8_t x1, const uint8_t x2);
char SSD1306_Putc(char ch, const FontDef_t* Font, SSD1306_COLOR_t color);
char SSD1306_Puts(char* str, FontDef_t* Font, SSD1306_COLOR_t color);
void SSD1306_SetPosition(const int x, const int y);
void SSD1306_UpdateScreen(void);


/**
 * @brief  Calculates string length and height in units of pixels depending on string and font used
 * @param  *str: String to be checked for length and height
 * @param  *SizeStruct: Pointer to empty @ref FONTS_SIZE_t structure where informations will be saved
 * @param  *Font: Pointer to @ref FontDef_t font used for calculations
 * @retval Pointer to string used for length and height
 */
char* FONTS_GetStringSize(char* str, FONTS_SIZE_t* SizeStruct, FontDef_t* Font);






#endif