/*
 * Display.cpp
 *
 * Wrapper class for Adafruit OLED display.
 *
 *  Created on: 28.01.2022
 *      Author: FSmilari
 */

#include "Display.h"


/*****************
 ** Constructors.
 ****************/
Display::Display() {
	ssd1306 = Adafruit_SSD1306(SCREEN_WIDTH, SCREEN_HEIGHT);
	u8g2_gfx.begin(ssd1306);
}

/******************
 ** Public methods
 *****************/
void Display::init() {
	if (!ssd1306.begin(SSD1306_SWITCHCAPVCC, SCREEN_ADDRESS, true, true)) {
		Serial.println(F("SSD1306 allocation failed"));
		for (;;)
			; // Don't proceed, loop forever
	}
}

void Display::display() {
	ssd1306.display();
}

void Display::clearDisplay() {
	ssd1306.clearDisplay();
}

void Display::showBrand() {
	ssd1306.clearDisplay();
	ssd1306.drawBitmap(0, 0, epd_bitmap_SFTools_Logo, 128, 34, SSD1306_WHITE);

	char *s = &String("Frästisch N172")[0];
	int16_t w = 0, h = 0;
	u8g2_gfx.setFont(u8g2_font_helvB12_tf);
	w = u8g2_gfx.getUTF8Width(s);
	h = u8g2_gfx.getFontAscent() - u8g2_gfx.getFontDescent();
	u8g2_gfx.setForegroundColor(SSD1306_WHITE);
	u8g2_gfx.setCursor((SCREEN_WIDTH - w) / 2, 63 - (30 - h) / 2);
	u8g2_gfx.println(F(s));
	display();
}

void Display::showInitialization() {
	ssd1306.clearDisplay();

	char *s = &String("Initialisieren")[0];
	int16_t w = 0;
	u8g2_gfx.setFont(u8g2_font_helvB12_tf);
	w = u8g2_gfx.getUTF8Width(s);
	Serial.println("w: " + String(w));
	u8g2_gfx.setForegroundColor(SSD1306_WHITE);
	u8g2_gfx.setCursor((SCREEN_WIDTH - w) / 2, 30);
	u8g2_gfx.println(F(s));

	char *g;
	w = u8g2_gfx.getUTF8Width(". . . . .");
	Serial.println("w: " + String(w));
	u8g2_gfx.setCursor((SCREEN_WIDTH - w) / 2, 50);
	String gauge = "";
	for (int i = 0; i < 6; i++) {
		g = &gauge[0];
		u8g2_gfx.print(g);
		display();
		delay(500);
		if (i < 4) {
			gauge = ". ";
			g = &gauge[0];
		} else {
			gauge = ".";
			g = &gauge[0];
		}
	}
}


void Display::showFrame(Status status) {
	ssd1306.clearDisplay();
	ssd1306.drawRoundRect(0, 0, SCREEN_WIDTH, SCREEN_HEIGHT, 3, SSD1306_WHITE);
	ssd1306.drawLine(37, 0, 37, SCREEN_HEIGHT - 1, SSD1306_WHITE);
	ssd1306.drawLine(0, 15, 37, 15, SSD1306_WHITE);

	switch (status) {
		case TOOL_CHANGE:
			drawStatusText(STATUS_TXT_TOOLCHG);
			break;
		case CONFIGURATION:
			ssd1306.drawLine(37, SCREEN_HEIGHT / 2 - 1, SCREEN_WIDTH - 1, SCREEN_HEIGHT / 2 - 1, SSD1306_WHITE);
			drawStatusText (STATUS_TXT_CFG);
			drawConfigText("Höhe WLS");
			drawConfigOption("03.00 mm");
			break;
		case IDLE:
			ssd1306.drawLine(37, 43, SCREEN_WIDTH - 1, 43, SSD1306_WHITE);
			drawStatusText(STATUS_TXT_IDLE);
			break;
		default:
			break;
	}

	display();
}

/********************************
 ** Private methods
 *******************************/
void Display::calculateWH(String units, uint16_t &w, uint16_t &h) {
	int x = 0;
	int y = 0;
	int16_t x1, y1;
	uint16_t w1, h1;

	ssd1306.getTextBounds(units, x, y, &x1, &y1, &w1, &h1);
	w = w1;
	h = h1;
}


void Display::drawStatusText(String txt) {
	char *s = &txt[0];
	int16_t w = 0;

	u8g2_gfx.setFont(u8g2_font_helvR08_tf);  // select u8g2 font from here: https://github.com/olikraus/u8g2/wiki/fntlistall
	w = u8g2_gfx.getUTF8Width(s);
	u8g2_gfx.setCursor((37 - w) / 2, 12);
	u8g2_gfx.println(F(s));
}

void Display::drawConfigText(String txt) {
	char *s = &txt[0];
	int16_t w = 0, h = 0;

	u8g2_gfx.setFont(u8g2_font_helvB12_tf);  // select u8g2 font from here: https://github.com/olikraus/u8g2/wiki/fntlistall
	w = u8g2_gfx.getUTF8Width(s);
	h = u8g2_gfx.getFontAscent() - u8g2_gfx.getFontDescent();
	u8g2_gfx.setCursor((SCREEN_WIDTH + 37 - w) / 2, SCREEN_HEIGHT / 4 + h / 2 - 1);                // start writing at this position
	u8g2_gfx.println(F(s));
}

void Display::drawConfigOption(String txt) {
	char *s = &txt[0];
	int16_t w = 0, h = 0;

	u8g2_gfx.setFont(u8g2_font_helvB12_tf);
	w = u8g2_gfx.getUTF8Width(s);
	h = u8g2_gfx.getFontAscent() - u8g2_gfx.getFontDescent();
	u8g2_gfx.setCursor((SCREEN_WIDTH + 37 - w) / 2, SCREEN_HEIGHT / 4 * 3 + h / 2 - 1);
	u8g2_gfx.println(F(s));
}