/**
 * Simple API for scrolling lines. Keeps things simple by not even assuming
 * which screen is being drawn on.
 */

#ifndef DEVICE_SCREEN_H
#define DEVICE_SCREEN_H

#include <time.h>
#include <SSD1306Brzo.h>
#include <Wire.h>

#define SCREEN_WIDTH		(128)
#define SCREEN_HEIGHT		(32)
#define FONT_WIDTH		(8)
#define SCREEN_MAX_CHARS	(SCREEN_WIDTH / FONT_WIDTH)

/**
 * Struct that keeps track of the lines on the screen.
 */
struct display_status {
	SSD1306Brzo *screen;		/* Screen to draw on. */
	time_t delta;			/* Seconds/Line */
	time_t last_scroll_time;	/* Last second the line was scrolled */
	char *message;			/* Entire message to be shown */
	char *first_line;		/* First line on display */
	char *second_line;		/* Second line on display */
	size_t message_len;		/* Length of the message */
	size_t line_cursor;		/* Index of the first line being displayed. */
};

/**
 * Displays scrolling text on the screen.
 */
void display_update_scroll(struct display_status *status);

/**
 * Initialises display_status structure so it can be used for
 * display_update_scroll.
 *
 * screen	- screen to draw on
 *
 * status	- structure to Initialise
 *
 * msg		- message to scroll on the screen
 */
void display_status_init(SSD1306Brzo *screen, struct display_status *status, char *msg);

#endif /* DEVICE_SCREEN_H */