const gameArea = document.querySelector('.game-area');
const dotCountDisplay = document.getElementById('dotCount');
const message = document.querySelector('.message');

let dots = [];
let lastMouseX = 0;
let lastMouseY = 0;
let lastMouseTime = 0;
let mouseVelocityX = 0;
let mouseVelocityY = 0;

class Dot {
    constructor(x, y) {
        this.element = document.createElement('div');
        this.element.className = 'dot';
        this.x = x;
        this.y = y;
        this.velocityX = (Math.random() - 0.5) * 200;
        this.velocityY = (Math.random() - 0.5) * 200;
        this.lastDuplication = Date.now();
        this.acceleration = 0;
        gameArea.appendChild(this.element);
        this.updatePosition();
    }

    updatePosition() {
        this.element.style.left = `${this.x}px`;
        this.element.style.top = `${this.y}px`;
    }

    move() {
        this.velocityX += (Math.random() - 0.5) * 20;
        this.velocityY += (Math.random() - 0.5) * 20;
        
        this.x += this.velocityX * 0.016;
        this.y += this.velocityY * 0.016;
        
        if (this.x < 0) {
            this.x = window.innerWidth;
        } else if (this.x > window.innerWidth) {
            this.x = 0;
        }
        
        if (this.y < 0) {
            this.y = window.innerHeight;
        } else if (this.y > window.innerHeight) {
            this.y = 0;
        }
        
        this.velocityX *= 0.98;
        this.velocityY *= 0.98;
        
        const currentSpeed = Math.sqrt(this.velocityX * this.velocityX + this.velocityY * this.velocityY);
        if (currentSpeed < 100) {
            const angle = Math.atan2(this.velocityY, this.velocityX);
            this.velocityX = Math.cos(angle) * 100;
            this.velocityY = Math.sin(angle) * 100;
        }
        
        if (currentSpeed > 400) {
            const angle = Math.atan2(this.velocityY, this.velocityX);
            this.velocityX = Math.cos(angle) * 400;
            this.velocityY = Math.sin(angle) * 400;
        }
        
        this.updatePosition();

        const now = Date.now();
        if (now - this.lastDuplication > 3000 && Math.random() < 0.002) {
            this.duplicate();
            this.lastDuplication = now;
        }
    }

    duplicate() {
        if (dots.length < 8) {
            const newDot = new Dot(this.x, this.y);
            newDot.velocityX = this.velocityX * 1.2;
            newDot.velocityY = this.velocityY * 1.2;
            dots.push(newDot);
            updateDotCount();
        }
    }

    avoidMouse(mouseX, mouseY, mouseVelX, mouseVelY) {
        const dx = this.x - mouseX;
        const dy = this.y - mouseY;
        const distance = Math.sqrt(dx * dx + dy * dy);
        
        if (distance < 300) {
            const speed = 300;
            const mouseSpeed = Math.sqrt(mouseVelX * mouseVelX + mouseVelY * mouseVelY);
            
            const dotToMouseAngle = Math.atan2(dy, dx);
            const mouseMovementAngle = Math.atan2(mouseVelY, mouseVelX);
            const angleDiff = Math.abs(dotToMouseAngle - mouseMovementAngle);
            
            const distanceFactor = Math.min(1, (300 - distance) / 300);
            
            if (angleDiff < Math.PI / 2) {
                const targetSpeed = speed + mouseSpeed * 800 * distanceFactor;
                const currentSpeed = Math.sqrt(this.velocityX * this.velocityX + this.velocityY * this.velocityY);
                const acceleration = Math.min(0.2, (targetSpeed - currentSpeed) / 1000);
                
                this.velocityX = this.velocityX * (1 - acceleration) + Math.cos(dotToMouseAngle) * targetSpeed * acceleration;
                this.velocityY = this.velocityY * (1 - acceleration) + Math.sin(dotToMouseAngle) * targetSpeed * acceleration;
            }
        }
    }
}

function updateDotCount() {
    dotCountDisplay.textContent = dots.length;
}

function initializeGame() {
    const firstDot = new Dot(
        Math.random() * window.innerWidth,
        Math.random() * window.innerHeight
    );
    dots.push(firstDot);
    updateDotCount();
}

function moveDot(event) {
    const currentTime = Date.now();
    const timeDiff = currentTime - lastMouseTime;
    
    if (lastMouseTime !== 0) {
        mouseVelocityX = (event.clientX - lastMouseX) / timeDiff;
        mouseVelocityY = (event.clientY - lastMouseY) / timeDiff;
    }
    
    lastMouseX = event.clientX;
    lastMouseY = event.clientY;
    lastMouseTime = currentTime;
    
    dots.forEach(dot => dot.avoidMouse(event.clientX, event.clientY, mouseVelocityX, mouseVelocityY));
}

function updateDots() {
    dots.forEach(dot => dot.move());
    requestAnimationFrame(updateDots);
}

gameArea.addEventListener('mousemove', moveDot);

initializeGame();
updateDots();

window.addEventListener('resize', () => {
    dots.forEach(dot => {
        dot.x = Math.min(dot.x, window.innerWidth);
        dot.y = Math.min(dot.y, window.innerHeight);
        dot.updatePosition();
    });
});