// You can find the Turtle API reference here: https://turtletoy.net/syntax
Canvas.setpenopacity(1);

let maxStories = 3; // min=1, max=10, step=1
let storyHeight = 5; // min=1, max=20, step=0.1
let houseWidth = 8; // min=1, max=25, step=0.1
let houseBlockSize = 0; // min=0, max=20, step=1
let resetBlockNewStreet = 0; // min=0, max=1, step=1
let roofAngle = 45; // min=0, max=60, step=1
let roofLine = 0; // min=0, max=1, step=0.01
let streets = 10; // min=1, max=10, step=1
let streetGap = 10; // min=5, max=50, step=0.1
let doors = 0; // min=0, max=1, step=0.01
let doorWidth = 2.5; // min=1, max=10, step=0.1
let doorHeight = 3.5; // min=1, max=20, step=0.1
let doorBottom = 0; // min=0, max=1, step=1
let windows = 0.5; // min=0, max=1, step=0.01

// Global code will be evaluated once.
const turtle = new Turtle();
turtle.penup();
turtle.goto(-95,-100+(maxStories*storyHeight)+streetGap);
turtle.pendown();

let blockCounter = 0;
let houseCounter = 0;
let streetCounter = 1;
let drawing = true;

while(drawing){
    if(houseCounter * houseWidth > 180){
        turtle.penup();
        streetCounter++;
        houseCounter = 0;
        if(resetBlockNewStreet || blockCounter == houseBlockSize){blockCounter = 0;}
        if(streetCounter > streets){
            drawing = false;
        }
        turtle.goto(-95,turtle.y()+(maxStories*storyHeight)+streetGap);
        turtle.pendown();
    } else {
    drawHouse();
    }
}

function drawHouse() {
    
    let houseHeight = random([0,maxStories]);
    if(houseBlockSize && blockCounter == houseBlockSize){
        turtle.penup();
        turtle.forward(houseWidth);
        turtle.pendown();
        blockCounter = -1;
    }
    else if(houseHeight == 0){
        turtle.forward(houseWidth);
    }
    else{
        turtle.left(90);
        turtle.forward(houseHeight*storyHeight);
        turtle.right(90-roofAngle);
        turtle.forward(houseWidth/2/Math.cos(Math.PI/180*roofAngle));
        turtle.right((2*roofAngle));
        turtle.forward(houseWidth/2/Math.cos(Math.PI/180*roofAngle));
        turtle.right(90-roofAngle);
        drawRoofLine();
        turtle.forward(houseHeight*storyHeight);
        turtle.left(90);
        drawDoor();
        drawWindows(houseHeight);
    }
    blockCounter++;
    houseCounter++;
}

function drawWindows(stories){
    if(stories > 1 && (windows == 1 || (windows && Math.random() < windows))){
        // Get current position
        const currentPosn = turtle.pos();
        let windowWidth = houseWidth/5;
        let windowHeight = storyHeight/2.5;
        // Move to first floor
        turtle.penup();
        turtle.backward(houseWidth);
        turtle.left(90);
        turtle.forward(storyHeight*5/4);
        turtle.right(90);
        turtle.forward(windowWidth);
        
        // Add windows for each story
        for(var i=0;i<stories-1;i++){
            let prevWindow = turtle.pos();
            turtle.pendown();
            turtle.forward(windowWidth);
            turtle.left(90);
            turtle.forward(windowHeight);
            turtle.left(90);
            turtle.forward(windowWidth);
            turtle.left(90);
            turtle.forward(windowHeight);
            turtle.left(90);
            turtle.penup();
            turtle.forward(windowWidth*2);
            turtle.pendown();
            turtle.forward(windowWidth);
            turtle.left(90);
            turtle.forward(windowHeight);
            turtle.left(90);
            turtle.forward(windowWidth);
            turtle.left(90);
            turtle.forward(windowHeight);
            turtle.left(90);
            turtle.penup();
            turtle.goto(prevWindow);
            turtle.left(90);
            turtle.forward(storyHeight);
            turtle.right(90);
        }
        
        // Move back to start
        turtle.penup();
        turtle.goto(currentPosn)
        turtle.pendown();
    }
}

function drawRoofLine(){
    if(roofLine == 1 || (roofLine && Math.random() < roofLine)){
        turtle.right(90);
        turtle.forward(houseWidth);
        turtle.penup();
        turtle.backward(houseWidth);
        turtle.left(90);
        turtle.pendown();
    }
}

function drawDoor(){
    if(doors == 1 || (doors && Math.random() < doors)){
        turtle.penup();
        if(doorBottom){
            turtle.backward((houseWidth-doorWidth)/2);
            turtle.pendown();
            turtle.backward(doorWidth);
        }else{
            turtle.backward((houseWidth+doorWidth)/2);
            turtle.pendown();
        }
        turtle.left(90);
        turtle.forward(doorHeight);
        turtle.right(90);
        turtle.forward(doorWidth);
        turtle.right(90);
        turtle.forward(doorHeight);
        turtle.penup();
        turtle.left(90);
        turtle.forward((houseWidth-doorWidth)/2);
        turtle.pendown();
    }
}

function random(range) {
  return Math.round(Math.random() * (range[1] - range[0]) ) + range[0];
}