// Main JS file for blog interactivity

document.addEventListener('DOMContentLoaded', () => {
    // Show toast message from URL parameter if present
    const urlParams = new URLSearchParams(window.location.search);
    const msg = urlParams.get('msg');
    
    if (msg) {
        showToast(msg);
    }
});

function showToast(message) {
    const toast = document.createElement('div');
    toast.className = 'toast';
    toast.textContent = message;
    toast.style.display = 'block';
    document.body.appendChild(toast);
    
    setTimeout(() => {
        toast.style.opacity = '0';
        toast.style.transition = 'opacity 0.5s';
        setTimeout(() => toast.remove(), 500);
    }, 3000);
}

// --- Interactive Background ---
document.addEventListener('DOMContentLoaded', () => {
    initInteractiveBackground();
});

function initInteractiveBackground() {
    // 1. Mouse Glow & Parallax shapes
    const mouseShape = document.querySelector('.shape-mouse');
    const bgShapes = document.querySelectorAll('.bg-shapes .shape:not(.shape-mouse)');
    
    let mouseX = window.innerWidth / 2;
    let mouseY = window.innerHeight / 2;
    let currentX = mouseX;
    let currentY = mouseY;
    
    // Parallax variables
    const windowCenterX = window.innerWidth / 2;
    const windowCenterY = window.innerHeight / 2;

    document.addEventListener('mousemove', (e) => {
        mouseX = e.clientX;
        mouseY = e.clientY;
        
        // Make the mouse glow visible once mouse moves
        if (mouseShape && mouseShape.style.opacity === '0') {
            mouseShape.style.opacity = '1';
        }
        
        // Simple parallax for the background blobs
        bgShapes.forEach(shape => {
            const speed = parseFloat(shape.getAttribute('data-speed') || 1);
            const x = (windowCenterX - mouseX) * speed * 0.05;
            const y = (windowCenterY - mouseY) * speed * 0.05;
            // Use translation combined with the existing animation (in CSS, we'll just layer it)
            // Note: Since css animation overrides transform, we can apply parallax translation
            // by updating margin or a nested div. Alternatively, since shape-1 and shape-2
            // have keyframes using transform, we shouldn't overwrite transform directly.
            // Let's use margin instead for a simple offset!
            shape.style.marginLeft = `${x}px`;
            shape.style.marginTop = `${y}px`;
        });
    });

    // Smooth follow for the glowing orb
    function animateGlow() {
        if (mouseShape) {
            currentX += (mouseX - currentX) * 0.1;
            currentY += (mouseY - currentY) * 0.1;
            // Center the 300x300 shape on the cursor (so subtract half width/height)
            mouseShape.style.transform = `translate(${currentX}px, ${currentY}px)`;
        }
        requestAnimationFrame(animateGlow);
    }
    animateGlow();

    // 2. Interactive Canvas Particles
    const canvas = document.getElementById('bg-canvas');
    if (!canvas) return;
    
    const ctx = canvas.getContext('2d');
    let particles = [];
    
    function resizeCanvas() {
        canvas.width = window.innerWidth;
        canvas.height = window.innerHeight;
        initParticles();
    }

    class Particle {
        constructor() {
            this.x = Math.random() * canvas.width;
            this.y = Math.random() * canvas.height;
            this.size = Math.random() * 2 + 0.5;
            this.baseX = this.x;
            this.baseY = this.y;
            this.density = (Math.random() * 30) + 1;
            this.speedX = (Math.random() - 0.5) * 0.5;
            this.speedY = (Math.random() - 0.5) * 0.5;
        }

        update() {
            this.x += this.speedX;
            this.y += this.speedY;

            // Bounce off edges
            if (this.x > canvas.width || this.x < 0) this.speedX = -this.speedX;
            if (this.y > canvas.height || this.y < 0) this.speedY = -this.speedY;

            // Mouse interaction (repel)
            let dx = mouseX - this.x;
            let dy = mouseY - this.y;
            let distance = Math.sqrt(dx * dx + dy * dy);
            let forceDirectionX = dx / distance;
            let forceDirectionY = dy / distance;
            let maxDistance = 150;
            let force = (maxDistance - distance) / maxDistance;
            let directionX = forceDirectionX * force * this.density;
            let directionY = forceDirectionY * force * this.density;

            if (distance < maxDistance) {
                this.x -= directionX;
                this.y -= directionY;
            }
        }

        draw() {
            ctx.fillStyle = 'rgba(37, 99, 235, 0.4)';
            ctx.beginPath();
            ctx.arc(this.x, this.y, this.size, 0, Math.PI * 2);
            ctx.closePath();
            ctx.fill();
        }
    }

    function initParticles() {
        particles = [];
        let numParticles = Math.min((canvas.width * canvas.height) / 10000, 100); // cap at 100 for perf
        for (let i = 0; i < numParticles; i++) {
            particles.push(new Particle());
        }
    }

    function animateParticles() {
        ctx.clearRect(0, 0, canvas.width, canvas.height);
        
        for (let i = 0; i < particles.length; i++) {
            particles[i].update();
            particles[i].draw();
            
            // Connect particles
            for (let j = i; j < particles.length; j++) {
                let dx = particles[i].x - particles[j].x;
                let dy = particles[i].y - particles[j].y;
                let distance = Math.sqrt(dx * dx + dy * dy);
                
                if (distance < 120) {
                    ctx.beginPath();
                    ctx.strokeStyle = `rgba(37, 99, 235, ${0.1 * (1 - distance/120)})`;
                    ctx.lineWidth = 1;
                    ctx.moveTo(particles[i].x, particles[i].y);
                    ctx.lineTo(particles[j].x, particles[j].y);
                    ctx.stroke();
                    ctx.closePath();
                }
            }
        }
        requestAnimationFrame(animateParticles);
    }

    window.addEventListener('resize', resizeCanvas);
    resizeCanvas();
    animateParticles();
}