// some required libraries
#include <LiquidCrystal.h> // lcd display
#include <SPI.h> // communications
#include <Wire.h> // i have no idea, but needed
#include <Adafruit_GFX.h> // gfx library for oled
#include <Adafruit_SSD1306.h> // oled display driver
#define OLED_RESET 4 // oled reset code
Adafruit_SSD1306 display(OLED_RESET); // oled reset
LiquidCrystal lcd(12, 11, 5, 4, 3, 2); // lcd setup
// variables used for buttons
const int buttonPin_left = 7; // left button pin
const int buttonPin_up = 8; // up button pin
const int buttonPin_right = 9; // right button pin
int buttonState_up = 0; // up button state
int buttonState_left = 0; // left button state
int buttonState_right = 0; // right button state
// lets create some functions
void LcdWrite(int x, int y, String text) { // this function will write to the lcd screen, this is not handled by RenderScene()
    lcd.setCursor(x, y); // set our lcd cursor position
    lcd.print(text); // write to the lcd screen
}

void OledWrite(int x, int y, int size, String text) { // this function will write to our oled
    display.setTextSize(size); // set the font size
    display.setTextColor(WHITE); // set the font color
    display.setCursor(x, y); // set the cursor position
    display.println(text); // add our text to the oled buffer
}

void RenderScene() { // this function will render our scene on the oled display
    display.display(); // update our oled (print buffer)
}

// our platform arrays
int Platform1[] = {0, 63, 128, 63}; // x1, y1, x2, y2
void DrawPlatforms() { // this function will add our platforms to the oled buffer
    /*
    Lets go into a little detail in this function:
    We use the drawLine() function to draw a line to the oled.
    the arguments are as follows:
    x1, y1, x2, y2, color
    Lets think of using a pen.
    x1 = the starting x position of the pens tip
    y1 = the starting y position of the pens tip
    x2 = the ending x position of the pens tip
    y2 = the ending y position of the pens tip
    so, between these coordinates, a line is drawn
    color = the color of the pen tip
    */
    display.drawLine(Platform1[0], Platform1[1], Platform1[2], Platform1[3], WHITE); // put our first platform into the buffer
}

// our characters arrays
String character[] = {"*"}; // this array holds ourcharacters images
int CharacterPos[] = {10, 10}; // our characters x and y positions
void Controls() { // this functions checks for input from the controller
    buttonState_up = digitalRead(buttonPin_up); // up button state
    buttonState_left = digitalRead(buttonPin_left); // left button state
    buttonState_right = digitalRead(buttonPin_right); // right button state
    if (buttonState_up == HIGH) { // up button detection
        // This is our jump script
        CharacterPos[1] = CharacterPos[1] - 7; // change the y position by - 1
    }
    if (buttonState_left == HIGH) { // left button detection
        CharacterPos[0] = CharacterPos[0] - 1; // change the x position by - 1
    }
    if (buttonState_right == HIGH) { // right button detection
        CharacterPos[0] = CharacterPos[0] + 1; // change the x position by + 1
    }
}

void Gravity() { // this function will control the gravitational forces of our character
    // this is hard to do
    if (CharacterPos[1] <= Platform1[1] - 5) { // if the characters y pos is less than platform1's y pos, fall
        CharacterPos[1] = CharacterPos[1] + 1; // change the y position by + 1
    }
}

void DrawCharacter() { // this function will draw our character to the screen
    OledWrite(CharacterPos[0], CharacterPos[1], 1, character[0]); // draw the character to the buffers
    }
void setup() { // our function that is loaded first
    display.begin(SSD1306_SWITCHCAPVCC, 0x3C); // lets begin our oled display/connection
    display.clearDisplay(); // clear oled display from anything left over from last session
    lcd.begin(16, 2); // define our lcd properties
    lcd.clear(); // clear our lcd screen from any residue
    LcdWrite(0, 0, "Arduino Gravity"); // display program name to lcd
    //LcdWrite(0, 1, "By Dan Jones"); // display creator to lcd
}

void Debugging() { // this function display debugging info on the lcd display
    lcd.setCursor(0, 1); // set our lcd cursor position
    lcd.print("X: "); // debugging info
    lcd.print(CharacterPos[0]); // debugging info
    lcd.print(" Y: "); // debugging info
    lcd.print(CharacterPos[1]); // debugging info
}
void loop() { // our looping function
    display.clearDisplay(); // clear our oled display (removes ghosting)
    Controls(); // check for input
    DrawCharacter(); // draw our character to the buffer
    DrawPlatforms(); // put our platforms into the oled buffer
    Gravity(); // run our gravity script
    Debugging(); // display our debugging information
    RenderScene(); // render our scene to the oled display
}