// Faraón Game FX Engine: Procedural Audio, Particles, Screen Shake & Animations

window.FaraonFx = (function () {
    let audioCtx = null;
    let isMuted = false;
    let particleCanvas = null;
    let particleCtx = null;
    let particles = [];
    let animationFrameId = null;

    function getAudioContext() {
        if (!audioCtx) {
            const AudioContext = window.AudioContext || window.webkitAudioContext;
            if (AudioContext) {
                audioCtx = new AudioContext();
            }
        }
        if (audioCtx && audioCtx.state === 'suspended') {
            audioCtx.resume();
        }
        return audioCtx;
    }

    // --- PROCEDURAL SOUND GENERATORS ---
    function playCardSnap() {
        if (isMuted) return;
        const ctx = getAudioContext();
        if (!ctx) return;

        const now = ctx.currentTime;
        const bufferSize = ctx.sampleRate * 0.05;
        const buffer = ctx.createBuffer(1, bufferSize, ctx.sampleRate);
        const data = buffer.getChannelData(0);
        for (let i = 0; i < bufferSize; i++) {
            data[i] = (Math.random() * 2 - 1) * Math.exp(-i / (ctx.sampleRate * 0.01));
        }

        const noise = ctx.createBufferSource();
        noise.buffer = buffer;

        const filter = ctx.createBiquadFilter();
        filter.type = 'bandpass';
        filter.frequency.setValueAtTime(1400 + Math.random() * 400, now);
        filter.Q.setValueAtTime(3, now);

        const osc = ctx.createOscillator();
        const oscGain = ctx.createGain();
        osc.type = 'sine';
        osc.frequency.setValueAtTime(160, now);
        osc.frequency.exponentialRampToValueAtTime(40, now + 0.08);

        oscGain.gain.setValueAtTime(0.3, now);
        oscGain.gain.exponentialRampToValueAtTime(0.001, now + 0.08);

        const noiseGain = ctx.createGain();
        noiseGain.gain.setValueAtTime(0.5, now);
        noiseGain.gain.exponentialRampToValueAtTime(0.001, now + 0.05);

        noise.connect(filter);
        filter.connect(noiseGain);
        noiseGain.connect(ctx.destination);

        osc.connect(oscGain);
        oscGain.connect(ctx.destination);

        noise.start(now);
        osc.start(now);
        osc.stop(now + 0.09);
    }

    function playCardDraw() {
        if (isMuted) return;
        const ctx = getAudioContext();
        if (!ctx) return;

        const now = ctx.currentTime;
        const bufferSize = ctx.sampleRate * 0.08;
        const buffer = ctx.createBuffer(1, bufferSize, ctx.sampleRate);
        const data = buffer.getChannelData(0);
        for (let i = 0; i < bufferSize; i++) {
            data[i] = (Math.random() * 2 - 1) * (1 - i / bufferSize);
        }

        const noise = ctx.createBufferSource();
        noise.buffer = buffer;

        const filter = ctx.createBiquadFilter();
        filter.type = 'bandpass';
        filter.frequency.setValueAtTime(2200, now);
        filter.frequency.exponentialRampToValueAtTime(800, now + 0.08);
        filter.Q.setValueAtTime(2, now);

        const gain = ctx.createGain();
        gain.gain.setValueAtTime(0.25, now);
        gain.gain.exponentialRampToValueAtTime(0.001, now + 0.08);

        noise.connect(filter);
        filter.connect(gain);
        gain.connect(ctx.destination);

        noise.start(now);
    }

    function playSevenStack(level) {
        if (isMuted) return;
        const ctx = getAudioContext();
        if (!ctx) return;

        const now = ctx.currentTime;
        const rootFreq = 180 + Math.min(level, 4) * 80;

        const osc1 = ctx.createOscillator();
        const osc2 = ctx.createOscillator();
        const gain = ctx.createGain();

        osc1.type = 'sawtooth';
        osc1.frequency.setValueAtTime(rootFreq, now);
        osc1.frequency.exponentialRampToValueAtTime(rootFreq * 0.5, now + 0.4);

        osc2.type = 'triangle';
        osc2.frequency.setValueAtTime(rootFreq * 1.5, now);
        osc2.frequency.exponentialRampToValueAtTime(rootFreq * 0.75, now + 0.4);

        const filter = ctx.createBiquadFilter();
        filter.type = 'lowpass';
        filter.frequency.setValueAtTime(2000, now);
        filter.frequency.exponentialRampToValueAtTime(200, now + 0.4);

        gain.gain.setValueAtTime(0.4 + Math.min(level * 0.1, 0.4), now);
        gain.gain.exponentialRampToValueAtTime(0.001, now + 0.45);

        osc1.connect(filter);
        osc2.connect(filter);
        filter.connect(gain);
        gain.connect(ctx.destination);

        osc1.start(now);
        osc2.start(now);
        osc1.stop(now + 0.45);
        osc2.stop(now + 0.45);

        triggerScreenShake(level * 3 + 2);
    }

    function playAceFreeze() {
        if (isMuted) return;
        const ctx = getAudioContext();
        if (!ctx) return;

        const now = ctx.currentTime;
        const freqs = [880, 1174, 1567, 2093];
        freqs.forEach((freq, idx) => {
            const osc = ctx.createOscillator();
            const gain = ctx.createGain();
            osc.type = 'sine';
            osc.frequency.setValueAtTime(freq, now + idx * 0.04);

            gain.gain.setValueAtTime(0.15, now + idx * 0.04);
            gain.gain.exponentialRampToValueAtTime(0.001, now + idx * 0.04 + 0.35);

            osc.connect(gain);
            gain.connect(ctx.destination);

            osc.start(now + idx * 0.04);
            osc.stop(now + idx * 0.04 + 0.36);
        });

        triggerScreenShake(3);
    }

    function playHornikChime() {
        if (isMuted) return;
        const ctx = getAudioContext();
        if (!ctx) return;

        const now = ctx.currentTime;
        const notes = [523.25, 659.25, 783.99, 1046.50];
        notes.forEach((freq, i) => {
            const osc = ctx.createOscillator();
            const gain = ctx.createGain();
            osc.type = 'sine';
            osc.frequency.setValueAtTime(freq, now + i * 0.05);

            gain.gain.setValueAtTime(0.2, now + i * 0.05);
            gain.gain.exponentialRampToValueAtTime(0.001, now + i * 0.05 + 0.6);

            osc.connect(gain);
            gain.connect(ctx.destination);

            osc.start(now + i * 0.05);
            osc.stop(now + i * 0.05 + 0.61);
        });
    }

    function playBurnExplosion() {
        if (isMuted) return;
        const ctx = getAudioContext();
        if (!ctx) return;

        const now = ctx.currentTime;
        const osc = ctx.createOscillator();
        const oscGain = ctx.createGain();
        osc.type = 'sawtooth';
        osc.frequency.setValueAtTime(140, now);
        osc.frequency.exponentialRampToValueAtTime(30, now + 0.7);

        oscGain.gain.setValueAtTime(0.6, now);
        oscGain.gain.exponentialRampToValueAtTime(0.001, now + 0.7);

        const bufferSize = ctx.sampleRate * 0.6;
        const buffer = ctx.createBuffer(1, bufferSize, ctx.sampleRate);
        const data = buffer.getChannelData(0);
        for (let i = 0; i < bufferSize; i++) {
            data[i] = (Math.random() * 2 - 1) * Math.exp(-i / (ctx.sampleRate * 0.15));
        }
        const noise = ctx.createBufferSource();
        noise.buffer = buffer;
        const filter = ctx.createBiquadFilter();
        filter.type = 'lowpass';
        filter.frequency.setValueAtTime(800, now);
        filter.frequency.exponentialRampToValueAtTime(100, now + 0.6);

        const noiseGain = ctx.createGain();
        noiseGain.gain.setValueAtTime(0.6, now);
        noiseGain.gain.exponentialRampToValueAtTime(0.001, now + 0.6);

        noise.connect(filter);
        filter.connect(noiseGain);
        noiseGain.connect(ctx.destination);

        osc.connect(oscGain);
        oscGain.connect(ctx.destination);

        noise.start(now);
        osc.start(now);
        osc.stop(now + 0.71);

        triggerScreenShake(12);
    }

    function playVictory() {
        if (isMuted) return;
        const ctx = getAudioContext();
        if (!ctx) return;

        const now = ctx.currentTime;
        const melody = [
            { f: 261.63, t: 0.00, d: 0.15 },
            { f: 392.00, t: 0.15, d: 0.15 },
            { f: 523.25, t: 0.30, d: 0.20 },
            { f: 659.25, t: 0.50, d: 0.20 },
            { f: 783.99, t: 0.70, d: 0.60 }
        ];

        melody.forEach(note => {
            const osc = ctx.createOscillator();
            const gain = ctx.createGain();
            osc.type = 'triangle';
            osc.frequency.setValueAtTime(note.f, now + note.t);

            gain.gain.setValueAtTime(0.3, now + note.t);
            gain.gain.exponentialRampToValueAtTime(0.001, now + note.t + note.d);

            osc.connect(gain);
            gain.connect(ctx.destination);

            osc.start(now + note.t);
            osc.stop(now + note.t + note.d + 0.05);
        });

        triggerConfetti();
    }

    function playHeartbeat() {
        if (isMuted) return;
        const ctx = getAudioContext();
        if (!ctx) return;

        const now = ctx.currentTime;
        [0, 0.18].forEach(offset => {
            const osc = ctx.createOscillator();
            const gain = ctx.createGain();
            osc.type = 'sine';
            osc.frequency.setValueAtTime(80, now + offset);
            osc.frequency.exponentialRampToValueAtTime(45, now + offset + 0.1);

            gain.gain.setValueAtTime(0.4, now + offset);
            gain.gain.exponentialRampToValueAtTime(0.001, now + offset + 0.12);

            osc.connect(gain);
            gain.connect(ctx.destination);

            osc.start(now + offset);
            osc.stop(now + offset + 0.13);
        });
    }

    // --- SCREEN SHAKE ---
    function triggerScreenShake(intensity = 5) {
        const board = document.getElementById('game-table-container');
        if (!board) return;

        board.classList.remove('shake-fx');
        void board.offsetWidth;
        board.style.setProperty('--shake-intensity', `${intensity}px`);
        board.classList.add('shake-fx');

        setTimeout(() => {
            board.classList.remove('shake-fx');
        }, 400);
    }

    // --- 3D CARD PLAY & DRAW ANIMATIONS ---
    function getElementCenter(elem) {
        if (!elem) return { x: window.innerWidth / 2, y: window.innerHeight / 2 };
        const rect = elem.getBoundingClientRect();
        return {
            x: rect.left + rect.width / 2,
            y: rect.top + rect.height / 2
        };
    }

    function getPositionCoords(position) {
        const w = window.innerWidth;
        const h = window.innerHeight;
        switch (position) {
            case 'left':
            case 'slot-left':
                return { x: w * 0.12, y: h * 0.45 };
            case 'top':
            case 'slot-top':
                return { x: w * 0.50, y: h * 0.14 };
            case 'right':
            case 'slot-right':
                return { x: w * 0.88, y: h * 0.45 };
            case 'bottom':
            case 'slot-bottom':
            default:
                return { x: w * 0.50, y: h * 0.82 };
        }
    }

    function animateCardPlay(sourcePosition, cardInfo) {
        return new Promise((resolve) => {
            const container = document.getElementById('game-table-container') || document.body;
            const discardTargetElem = document.querySelector('.discard-pile-container');
            const targetPos = discardTargetElem ? getElementCenter(discardTargetElem) : { x: window.innerWidth / 2 + 50, y: window.innerHeight / 2 };
            const startPos = getPositionCoords(sourcePosition);

            // Vytvoríme lietajúcu kartu
            const flyingCard = document.createElement('div');
            flyingCard.className = 'game-card marias-card flying-card-anim';
            flyingCard.style.position = 'fixed';
            flyingCard.style.left = `${startPos.x}px`;
            flyingCard.style.top = `${startPos.y}px`;
            flyingCard.style.transform = 'translate(-50%, -50%)';
            flyingCard.style.zIndex = '999';
            flyingCard.style.pointerEvents = 'none';
            flyingCard.style.boxShadow = '0 20px 40px rgba(0,0,0,0.8), 0 0 30px rgba(245, 176, 65, 0.9)';

            const deck = cardInfo.deck || 'original';
            const imgPath = (cardInfo.suit && cardInfo.rank) 
                ? `assets/cards/${deck}/${cardInfo.suit}_${cardInfo.rank}.webp` 
                : `assets/cards/${deck}/Card_Back.webp`;

            flyingCard.innerHTML = `<img src="${imgPath}" class="marias-card-img" />`;

            container.appendChild(flyingCard);

            const dx = targetPos.x - startPos.x;
            const dy = targetPos.y - startPos.y;
            const randomRotation = (Math.random() - 0.5) * 16; // -8 to +8 deg landing tilt

            const animation = flyingCard.animate([
                {
                    transform: 'translate(-50%, -50%) translate3d(0, 0, 0) scale(0.85) rotate(0deg)',
                    opacity: 0.9
                },
                {
                    transform: `translate(-50%, -50%) translate3d(${dx * 0.45}px, ${dy * 0.45 - 60}px, 0) scale(1.35) rotate(${randomRotation * 0.5}deg)`,
                    opacity: 1,
                    offset: 0.5
                },
                {
                    transform: `translate(-50%, -50%) translate3d(${dx}px, ${dy}px, 0) scale(1) rotate(${randomRotation}deg)`,
                    opacity: 1
                }
            ], {
                duration: 420,
                easing: 'cubic-bezier(0.175, 0.885, 0.32, 1.2)'
            });

            animation.onfinish = () => {
                playCardSnap();
                triggerImpactRipple(targetPos.x, targetPos.y);
                flyingCard.remove();
                resolve();
            };
        });
    }

    function animateCardDraw(targetPosition, deck = 'original') {
        return new Promise((resolve) => {
            const container = document.getElementById('game-table-container') || document.body;
            const deckElem = document.querySelector('.deck-card-container');
            const startPos = deckElem ? getElementCenter(deckElem) : { x: window.innerWidth / 2 - 50, y: window.innerHeight / 2 };
            const targetPos = getPositionCoords(targetPosition);

            const flyingBack = document.createElement('div');
            flyingBack.className = 'game-card marias-card flying-card-anim';
            flyingBack.style.position = 'fixed';
            flyingBack.style.left = `${startPos.x}px`;
            flyingBack.style.top = `${startPos.y}px`;
            flyingBack.style.transform = 'translate(-50%, -50%)';
            flyingBack.style.zIndex = '999';
            flyingBack.style.pointerEvents = 'none';
            flyingBack.style.boxShadow = '0 10px 25px rgba(0,0,0,0.7)';
            flyingBack.innerHTML = `<img src="assets/cards/${deck || 'original'}/Card_Back.webp" class="marias-card-img" />`;

            container.appendChild(flyingBack);
            playCardDraw();


            const dx = targetPos.x - startPos.x;
            const dy = targetPos.y - startPos.y;

            const animation = flyingBack.animate([
                { transform: 'translate(-50%, -50%) translate3d(0, 0, 0) scale(1) rotate(0deg)', opacity: 1 },
                { transform: `translate(-50%, -50%) translate3d(${dx * 0.5}px, ${dy * 0.5 - 30}px, 0) scale(1.15) rotate(10deg)`, opacity: 1, offset: 0.5 },
                { transform: `translate(-50%, -50%) translate3d(${dx}px, ${dy}px, 0) scale(0.6) rotate(0deg)`, opacity: 0.2 }
            ], {
                duration: 380,
                easing: 'cubic-bezier(0.25, 1, 0.5, 1)'
            });

            animation.onfinish = () => {
                flyingBack.remove();
                resolve();
            };
        });
    }

    function triggerImpactRipple(x, y) {
        if (!particleCanvas) return;
        for (let i = 0; i < 12; i++) {
            const angle = (i / 12) * Math.PI * 2;
            const speed = 2 + Math.random() * 3;
            particles.push({
                x: x,
                y: y,
                vx: Math.cos(angle) * speed,
                vy: Math.sin(angle) * speed,
                gravity: 0,
                size: 3 + Math.random() * 3,
                color: '#ffd700',
                shape: 'circle',
                life: 0.6,
                decay: 0.04,
                rotation: 0
            });
        }
    }

    // --- PARTICLE ENGINE ---
    function initParticles(canvasId) {
        particleCanvas = document.getElementById(canvasId);
        if (!particleCanvas) return;
        particleCtx = particleCanvas.getContext('2d');

        function resize() {
            if (particleCanvas) {
                particleCanvas.width = window.innerWidth;
                particleCanvas.height = window.innerHeight;
            }
        }
        window.addEventListener('resize', resize);
        resize();

        if (!animationFrameId) {
            renderParticles();
        }
    }

    function renderParticles() {
        if (particleCtx && particleCanvas) {
            particleCtx.clearRect(0, 0, particleCanvas.width, particleCanvas.height);

            for (let i = particles.length - 1; i >= 0; i--) {
                const p = particles[i];
                p.x += p.vx;
                p.y += p.vy;
                p.vy += p.gravity || 0;
                p.rotation += p.vRot || 0;
                p.life -= p.decay || 0.02;

                if (p.life <= 0) {
                    particles.splice(i, 1);
                    continue;
                }

                particleCtx.save();
                particleCtx.translate(p.x, p.y);
                particleCtx.rotate(p.rotation);
                particleCtx.globalAlpha = Math.max(0, p.life);

                if (p.shape === 'circle') {
                    particleCtx.fillStyle = p.color;
                    particleCtx.beginPath();
                    particleCtx.arc(0, 0, p.size, 0, Math.PI * 2);
                    particleCtx.fill();
                } else if (p.shape === 'rect') {
                    particleCtx.fillStyle = p.color;
                    particleCtx.fillRect(-p.size / 2, -p.size / 2, p.size, p.size * (p.aspect || 1));
                } else if (p.shape === 'spark') {
                    particleCtx.strokeStyle = p.color;
                    particleCtx.lineWidth = p.size;
                    particleCtx.beginPath();
                    particleCtx.moveTo(-p.vx * 3, -p.vy * 3);
                    particleCtx.lineTo(0, 0);
                    particleCtx.stroke();
                }
                particleCtx.restore();
            }
        }
        animationFrameId = requestAnimationFrame(renderParticles);
    }

    function triggerFireParticles(x, y, count = 25) {
        if (!particleCanvas) return;
        const colors = ['#ff4500', '#ff8c00', '#ffd700', '#ffffff'];
        for (let i = 0; i < count; i++) {
            const angle = -Math.PI / 2 + (Math.random() - 0.5) * 1.5;
            const speed = 3 + Math.random() * 6;
            particles.push({
                x: x || window.innerWidth / 2,
                y: y || window.innerHeight / 2,
                vx: Math.cos(angle) * speed,
                vy: Math.sin(angle) * speed,
                gravity: -0.05,
                size: 4 + Math.random() * 6,
                color: colors[Math.floor(Math.random() * colors.length)],
                shape: 'circle',
                life: 1.0,
                decay: 0.03 + Math.random() * 0.03,
                rotation: 0
            });
        }
    }

    function triggerIceParticles(x, y, count = 30) {
        if (!particleCanvas) return;
        const colors = ['#00ffff', '#e0ffff', '#87cefa', '#ffffff'];
        for (let i = 0; i < count; i++) {
            const angle = Math.random() * Math.PI * 2;
            const speed = 2 + Math.random() * 7;
            particles.push({
                x: x || window.innerWidth / 2,
                y: y || window.innerHeight / 2,
                vx: Math.cos(angle) * speed,
                vy: Math.sin(angle) * speed,
                gravity: 0.1,
                size: 3 + Math.random() * 5,
                color: colors[Math.floor(Math.random() * colors.length)],
                shape: 'spark',
                life: 1.0,
                decay: 0.02 + Math.random() * 0.02,
                rotation: Math.random() * Math.PI
            });
        }
    }

    function triggerBurnExplosion(x, y) {
        if (!particleCanvas) return;
        const colors = ['#ff0000', '#ff4500', '#ffaa00', '#333333', '#ffffff'];
        for (let i = 0; i < 60; i++) {
            const angle = Math.random() * Math.PI * 2;
            const speed = 4 + Math.random() * 10;
            particles.push({
                x: x || window.innerWidth / 2,
                y: y || window.innerHeight / 2,
                vx: Math.cos(angle) * speed,
                vy: Math.sin(angle) * speed,
                gravity: 0.15,
                size: 5 + Math.random() * 8,
                color: colors[Math.floor(Math.random() * colors.length)],
                shape: Math.random() > 0.5 ? 'rect' : 'circle',
                aspect: 1 + Math.random() * 2,
                life: 1.0,
                decay: 0.02 + Math.random() * 0.02,
                rotation: Math.random() * Math.PI,
                vRot: (Math.random() - 0.5) * 0.2
            });
        }
    }

    function triggerConfetti() {
        if (!particleCanvas) return;
        const colors = ['#ffd700', '#ff4500', '#00ffcc', '#ff007f', '#ffffff', '#7b2cbf'];
        for (let i = 0; i < 150; i++) {
            const x = Math.random() * window.innerWidth;
            const y = -20 - Math.random() * 50;
            particles.push({
                x: x,
                y: y,
                vx: (Math.random() - 0.5) * 4,
                vy: 3 + Math.random() * 5,
                gravity: 0.08,
                size: 8 + Math.random() * 6,
                aspect: 0.6 + Math.random() * 0.8,
                color: colors[Math.floor(Math.random() * colors.length)],
                shape: 'rect',
                life: 1.0,
                decay: 0.005 + Math.random() * 0.005,
                rotation: Math.random() * Math.PI * 2,
                vRot: (Math.random() - 0.5) * 0.15
            });
        }
    }

    function toggleMute() {
        isMuted = !isMuted;
        return isMuted;
    }

    return {
        playCardSnap,
        playCardDraw,
        playSevenStack,
        playAceFreeze,
        playHornikChime,
        playBurnExplosion,
        playVictory,
        playHeartbeat,
        triggerScreenShake,
        initParticles,
        triggerFireParticles,
        triggerIceParticles,
        triggerBurnExplosion,
        triggerConfetti,
        animateCardPlay,
        animateCardDraw,
        toggleMute
    };
})();