/*
 * This file is part of lcd library for ssd1306/sh1106 oled-display.
 *
 * lcd library for ssd1306/sh1106 oled-display is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or any later version.
 *
 * lcd library for ssd1306/sh1106 oled-display is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with Foobar.  If not, see <http://www.gnu.org/licenses/>.
 *
 * Diese Datei ist Teil von lcd library for ssd1306/sh1106 oled-display.
 *
 * lcd library for ssd1306/sh1106 oled-display ist Freie Software: Sie können es unter den Bedingungen
 * der GNU General Public License, wie von der Free Software Foundation,
 * Version 3 der Lizenz oder jeder späteren
 * veröffentlichten Version, weiterverbreiten und/oder modifizieren.
 *
 * lcd library for ssd1306/sh1106 oled-display wird in der Hoffnung, dass es nützlich sein wird, aber
 * OHNE JEDE GEWÄHRLEISTUNG, bereitgestellt; sogar ohne die implizite
 * Gewährleistung der MARKTFÄHIGKEIT oder EIGNUNG FÜR EINEN BESTIMMTEN ZWECK.
 * Siehe die GNU General Public License für weitere Details.
 *
 * Sie sollten eine Kopie der GNU General Public License zusammen mit diesem
 * Programm erhalten haben. Wenn nicht, siehe <http://www.gnu.org/licenses/>.
 *
 *  lcd.h
 *
 *  Created by Michael Koehler on 22.12.16.
 *  Copyright 2016 Skie-Systems. All rights reserved.
 *
 *  lib for OLED-Display with ssd1306/sh1106-Controller
 *  first dev-version only for I2C-Connection
 *  at ATMega328P like Arduino Uno
 *
 *  at GRAPHICMODE lib needs SRAM for display
 *  DISPLAY-WIDTH * DISPLAY-HEIGHT + 2 bytes
 */

#include "lcd.h"
#include "font.h"
#include <string.h>

/* TODO: setUp Font*/
const char *font = ssd1306oled_font6x8;

static struct {
	uint8_t x;
	uint8_t y;
} cursorPosition;
#if defined GRAPHICMODE
#include <stdlib.h>
static uint8_t displayBuffer[DISPLAYSIZE];
uint16_t actualIndex = 0;
#endif


const uint8_t init_sequence [] PROGMEM = {	// Initialization Sequence
LCD_DISP_OFF,	// Display OFF (sleep mode)
0x20, 0b00,		// Set Memory Addressing Mode
				// 00=Horizontal Addressing Mode; 01=Vertical Addressing Mode;
				// 10=Page Addressing Mode (RESET); 11=Invalid
0xB0,			// Set Page Start Address for Page Addressing Mode, 0-7
0xC8,			// Set COM Output Scan Direction
0x00,			// --set low column address
0x10,			// --set high column address
0x40,			// --set start line address
0x81, 0x3F,		// Set contrast control register
0xA1,			// Set Segment Re-map. A0=address mapped; A1=address 127 mapped.
0xA6,			// Set display mode. A6=Normal; A7=Inverse
0xA8, 0x3F,		// Set multiplex ratio(1 to 64)
0xA4,			// Output RAM to Display
				// 0xA4=Output follows RAM content; 0xA5,Output ignores RAM content
0xD3, 0x00,		// Set display offset. 00 = no offset
0xD5,			// --set display clock divide ratio/oscillator frequency
0xF0,			// --set divide ratio
0xD9, 0x22,		// Set pre-charge period
0xDA, 0x12,		// Set com pins hardware configuration
0xDB,			// --set vcomh
0x20,			// 0x20,0.77xVcc
0x8D, 0x14,		// Set DC-DC enable


};
#pragma mark LCD COMMUNICATION
void lcd_command(uint8_t cmd[], uint8_t size) {
    i2c_start((LCD_I2C_ADR << 1) | 0);
    i2c_byte(0x00);	// 0x00 for command, 0x40 for data
    for (uint8_t i=0; i<size; i++) {
        i2c_byte(cmd[i]);
    }
    i2c_stop();
}
void lcd_data(uint8_t data[], uint16_t size) {
    i2c_start((LCD_I2C_ADR << 1) | 0);
    i2c_byte(0x40);	// 0x00 for command, 0x40 for data
    for (uint16_t i = 0; i<size; i++) {
        i2c_byte(data[i]);
    }
    i2c_stop();
}
#pragma mark -
#pragma mark GENERAL FUNKTIONS
void lcd_init(uint8_t dispAttr){
    i2c_init();
    uint8_t commandSequence[sizeof(init_sequence)+1];
    for (uint8_t i = 0; i < sizeof (init_sequence); i++) {
        commandSequence[i] = (pgm_read_byte(&init_sequence[i]));
    }
    commandSequence[sizeof(init_sequence)]=(dispAttr);
    lcd_command(commandSequence, sizeof(commandSequence));
    lcd_clrscr();
}
void lcd_home(void){
    lcd_gotoxy(0, 0);
}
void lcd_invert(uint8_t invert){
    i2c_start((LCD_I2C_ADR << 1) | 0);
    uint8_t commandSequence[1];
    if (invert == YES) {
        commandSequence[0] = 0xA7;
    } else {
        commandSequence[0] = 0xA7;
    }
    lcd_command(commandSequence, 1);
}
void lcd_set_contrast(uint8_t contrast){
    uint8_t commandSequence[2] = {0x81, contrast};
    lcd_command(commandSequence, sizeof(commandSequence));
}
void lcd_puts(const char* s){
    while (*s) {
        lcd_putc(*s++);
    }
}
void lcd_puts_p(const char* progmem_s){
    register uint8_t c;
    while ((c = pgm_read_byte(progmem_s++))) {
        lcd_putc(c);
    }
}
#if defined TEXTMODE
#pragma mark -
#pragma mark TEXTMODE
void lcd_clrscr(void){
    uint8_t clearLine[DISPLAY_WIDTH];
    memset(clearLine, 0x00, DISPLAY_WIDTH);
    for (uint8_t j = 0; j < DISPLAY_HEIGHT/8; j++){
        lcd_gotoxy(0,j);
        lcd_data(clearLine, sizeof(clearLine));
        
    }
    lcd_home();
}
void lcd_gotoxy(uint8_t x, uint8_t y) {
    if( x > (DISPLAY_WIDTH/6) || y > (DISPLAY_HEIGHT/8-1)) return;// out of display
    cursorPosition.x=x;
	cursorPosition.y=y;
    x = x * 6;					// one char: 6 pixel width
#if defined SSD1306
    uint8_t commandSequence[] = {0xb0+y, 0x21, x, 0x7f};
#elif defined SH1106
    uint8_t commandSequence[] = {0xb0+y, 0x21, 0x00+((2+x) & (0x0f)), 0x10+( ((2+x) & (0xf0)) >> 4 ), 0x7f};
#endif
    lcd_command(commandSequence, sizeof(commandSequence));
}
void lcd_putc(char c){
	switch (c) {
		case '\t':
			// tab
			if( (cursorPosition.x+4) < (DISPLAY_WIDTH/6-4) ){
				lcd_gotoxy(cursorPosition.x+4, cursorPosition.y);
			}else{
				lcd_gotoxy(DISPLAY_WIDTH/6, cursorPosition.y);
			}
			break;
		case '\n':
			// linefeed
			if(cursorPosition.y < (DISPLAY_HEIGHT/8-1)){
				lcd_gotoxy(cursorPosition.x, ++cursorPosition.y);
			}
			break;
		case '\r':
			// carrige return
			lcd_gotoxy(0, cursorPosition.y);
			break;
		default:
			if((c > 127 ||
				cursorPosition.x > 20 ||
				c < 32) &&
			   (getCharCode(c) > 0) ) return;
			cursorPosition.x++;
			// mapping char
			c=getCharCode(c);	 
			uint8_t temp;
			// print char at display
			for (uint8_t i = 0; i < 6; i++)
			{
				// load bit-pattern from flash
				temp=pgm_read_byte(&font[c * 6 + i]);
				lcd_data((void*)&temp,1);	// print font to ram, print 6 columns
			}
			break;
	}
    
}
#elif defined GRAPHICMODE
#pragma mark -
#pragma mark GRAPHICMODE
void lcd_clrscr(void){
    memset(displayBuffer, 0x00, sizeof(displayBuffer));
#if defined SSD1306
    lcd_data(displayBuffer, sizeof(displayBuffer));
#elif defined SH1106
    for (uint8_t i=0; i <= DISPLAY_HEIGHT/8; i++) {
        uint8_t actualLine[DISPLAY_WIDTH];
        for (uint8_t j=0; j< DISPLAY_WIDTH; j++) {
            actualLine[j]=displayBuffer[i*DISPLAY_WIDTH+j];
        }
        lcd_data(actualLine, sizeof(actualLine));
        lcd_gotoxy(0, i);
    }
#endif
    lcd_home();
}
void lcd_gotoxy(uint8_t x, uint8_t y){
    if( x > (DISPLAY_WIDTH/6) || y > (DISPLAY_HEIGHT/8-1)) return;// out of display
    cursorPosition.x=x;
	cursorPosition.y=y;
    x = x * 6;					// one char: 6 pixel width
    actualIndex = (x)+(y*DISPLAY_WIDTH);
#if defined SSD1306
    uint8_t commandSequence[] = {0xb0+y, 0x21, x, 0x7f};
#elif defined SH1106
    uint8_t commandSequence[] = {0xb0+y, 0x21, 0x00+((2+x) & (0x0f)), 0x10+( ((2+x) & (0xf0)) >> 4 ), 0x7f};
#endif
    lcd_command(commandSequence, sizeof(commandSequence));
}
void lcd_putc(char c){
	switch (c) {
		case '\t':
			// tab
			if( (cursorPosition.x+4) < (DISPLAY_WIDTH/6-4) ){
				lcd_gotoxy(cursorPosition.x+4, cursorPosition.y);
			}else{
				lcd_gotoxy(DISPLAY_WIDTH/6, cursorPosition.y);
			}
			break;
		case '\n':
			// linefeed
			if(cursorPosition.y < (DISPLAY_HEIGHT/8-1)){
				lcd_gotoxy(cursorPosition.x, ++cursorPosition.y);
			}
			break;
		case '\r':
			// carrige return
			lcd_gotoxy(0, cursorPosition.y);
			break;
		default:
			if((actualIndex+1)%127 != 0){
				if((c > 127 ||
					cursorPosition.x > 20 ||
					c < 32) &&
				   (getCharCode(c) > 0) ) return;
				cursorPosition.x++;
				// mapping char
				c=getCharCode(c);	 
				
				// print char at display
				for (uint8_t i = 0; i < 6; i++)
				{
					// load bit-pattern from flash
					displayBuffer[actualIndex+i] =pgm_read_byte(&font[c * 6 + i]);
				}  
				
			}
			actualIndex += 6;
			break;
	}
}

void lcd_drawPixel(uint8_t x, uint8_t y, uint8_t color){
    if( x > DISPLAY_WIDTH-1 || y > (DISPLAY_HEIGHT-1)) return; // out of Display
    if( color == WHITE){
        displayBuffer[(uint8_t)(y / (DISPLAY_HEIGHT/8)) * DISPLAY_WIDTH +x] |= (1 << (y % (DISPLAY_HEIGHT/8)));
    } else {
        displayBuffer[(uint8_t)(y / (DISPLAY_HEIGHT/8)) * DISPLAY_WIDTH +x] &= ~(1 << (y % (DISPLAY_HEIGHT/8)));
    }
}
void lcd_drawLine(uint8_t x1, uint8_t y1, uint8_t x2, uint8_t y2, uint8_t color){
    if( x1 > DISPLAY_WIDTH-1 ||
       x2 > DISPLAY_WIDTH-1 ||
       y1 > DISPLAY_HEIGHT-1 ||
       y2 > DISPLAY_HEIGHT-1) return;
    int dx =  abs(x2-x1), sx = x1<x2 ? 1 : -1;
    int dy = -abs(y2-y1), sy = y1<y2 ? 1 : -1;
    int err = dx+dy, e2; /* error value e_xy */
    
    while(1){
        lcd_drawPixel(x1, y1, color);
        if (x1==x2 && y1==y2) break;
        e2 = 2*err;
        if (e2 > dy) { err += dy; x1 += sx; } /* e_xy+e_x > 0 */
        if (e2 < dx) { err += dx; y1 += sy; } /* e_xy+e_y < 0 */
    }
}
void lcd_drawRect(uint8_t px1, uint8_t py1, uint8_t px2, uint8_t py2, uint8_t color){
    if( px1 > DISPLAY_WIDTH-1 ||
       px2 > DISPLAY_WIDTH-1 ||
       py1 > DISPLAY_HEIGHT-1 ||
       py2 > DISPLAY_HEIGHT-1) return;
    lcd_drawLine(px1, py1, px2, py1, color);
    lcd_drawLine(px2, py1, px2, py2, color);
    lcd_drawLine(px2, py2, px1, py2, color);
    lcd_drawLine(px1, py2, px1, py1, color);
}
void lcd_fillRect(uint8_t px1, uint8_t py1, uint8_t px2, uint8_t py2, uint8_t color){
    if( px1 > px2){
        uint8_t temp = px1;
        px1 = px2;
        px2 = temp;
        temp = py1;
        py1 = py2;
        py2 = temp;
    }
    for (uint8_t i=0; i<=(py2-py1); i++){
        lcd_drawLine(px1, py1+i, px2, py1+i, color);
    }
}
void lcd_drawCircle(uint8_t center_x, uint8_t center_y, uint8_t radius, uint8_t color){
    if( ((center_x + radius) > DISPLAY_WIDTH-1) ||
       ((center_y + radius) > DISPLAY_HEIGHT-1) ||
       center_x < radius ||
       center_y < radius) return;
    int16_t f = 1 - radius;
    int16_t ddF_x = 1;
    int16_t ddF_y = -2 * radius;
    int16_t x = 0;
    int16_t y = radius;
    
    lcd_drawPixel(center_x  , center_y+radius, color);
    lcd_drawPixel(center_x  , center_y-radius, color);
    lcd_drawPixel(center_x+radius, center_y  , color);
    lcd_drawPixel(center_x-radius, center_y  , color);
    
    while (x<y) {
        if (f >= 0) {
            y--;
            ddF_y += 2;
            f += ddF_y;
        }
        x++;
        ddF_x += 2;
        f += ddF_x;
        
        lcd_drawPixel(center_x + x, center_y + y, color);
        lcd_drawPixel(center_x - x, center_y + y, color);
        lcd_drawPixel(center_x + x, center_y - y, color);
        lcd_drawPixel(center_x - x, center_y - y, color);
        lcd_drawPixel(center_x + y, center_y + x, color);
        lcd_drawPixel(center_x - y, center_y + x, color);
        lcd_drawPixel(center_x + y, center_y - x, color);
        lcd_drawPixel(center_x - y, center_y - x, color);
    }
}
void lcd_fillCircle(uint8_t center_x, uint8_t center_y, uint8_t radius, uint8_t color) {
    for(uint8_t i=0; i<= radius;i++){
        lcd_drawCircle(center_x, center_y, i, color);
    }
}
void lcd_drawBitmap(uint8_t x, uint8_t y, const uint8_t *picture, uint8_t width, uint8_t height, uint8_t color){
    uint8_t i,j, byteWidth = (width+7)/8;
    for (j = 0; j < height; j++) {
        for(i=0; i < width;i++){
            if(pgm_read_byte(picture + j * byteWidth + i / 8) & (128 >> (i & 7))){
                lcd_drawPixel(x+i, y+j, color);
            }
        }
    }
}
void lcd_display() {
#if defined SSD1306
    lcd_gotoxy(0,0);
    lcd_data(displayBuffer, sizeof(displayBuffer));
#elif defined SH1106
    for (uint8_t i=0; i < DISPLAY_HEIGHT/8; i++) {
        lcd_gotoxy(0, i);
        uint8_t actualLine[DISPLAY_WIDTH];
        for (uint8_t j=0; j < DISPLAY_WIDTH; j++) {
            actualLine[j]=displayBuffer[i*DISPLAY_WIDTH+j];
        }
        lcd_data(actualLine, sizeof(actualLine));
    }
#endif
}
#endif