// Initialize app
document.addEventListener('DOMContentLoaded', function() {
    initializeCharts();
    setupEventListeners();
    updateRealTimeData();
});

// Navigation
function scrollToSection(sectionId) {
    const section = document.getElementById(sectionId);
    if (section) {
        section.scrollIntoView({ behavior: 'smooth', block: 'start' });
        updateActiveNav(sectionId);
    }
}

function updateActiveNav(sectionId) {
    const navButtons = document.querySelectorAll('nav button');
    navButtons.forEach(btn => {
        btn.classList.remove('text-primary');
        btn.classList.add('text-gray-500');
    });
    
    const activeBtn = document.querySelector(`nav button[onclick*="${sectionId}"]`);
    if (activeBtn) {
        activeBtn.classList.remove('text-gray-500');
        activeBtn.classList.add('text-primary');
    }
}

// AI Analysis
function runAIAnalysis() {
    const resultsDiv = document.getElementById('ai-results');
    resultsDiv.innerHTML = '<div class="text-center py-4"><div class="inline-block animate-spin rounded-full h-8 w-8 border-b-2 border-white"></div></div>';
    
    setTimeout(() => {
        const insights = [
            { icon: '🧘', text: 'ควรทำสมาธิ 10 นาที ก่อนนอนเพื่อลดความเครียด' },
            { icon: '💧', text: 'ต้องการดื่มน้ำเพิ่ม 500 มล. ในช่วงบ่าย' },
            { icon: '🥗', text: 'แนะนำเพิ่มผักใบเขียวในมื้อเย็นวันนี้' },
            { icon: '☀️', text: 'ต้องการรับแสงแดด 15 นาทีเพื่อวิตามิน D' }
        ];
        
        resultsDiv.innerHTML = insights.map(insight => `
            <div class="bg-white bg-opacity-20 rounded-lg p-3 slide-up">
                <p class="text-sm">${insight.icon} ${insight.text}</p>
            </div>
        `).join('');
    }, 1500);
}

// Initialize Charts
function initializeCharts() {
    drawLineChart('hrvChart', [45, 48, 52, 50, 55, 52, 54], '#EF4444');
    drawLineChart('sleepChart', [6.5, 7.2, 6.8, 7.5, 8.0, 7.8, 7.2], '#8B5CF6');
    drawLineChart('weightChart', [76, 75.5, 75.8, 75.2, 75, 74.8, 75], '#3B82F6');
}

function drawLineChart(canvasId, data, color) {
    const canvas = document.getElementById(canvasId);
    if (!canvas) return;
    
    const ctx = canvas.getContext('2d');
    const width = canvas.width = canvas.offsetWidth;
    const height = canvas.height = 128;
    
    const padding = 10;
    const graphWidth = width - padding * 2;
    const graphHeight = height - padding * 2;
    
    const maxValue = Math.max(...data);
    const minValue = Math.min(...data);
    const range = maxValue - minValue;
    
    // Clear canvas
    ctx.clearRect(0, 0, width, height);
    
    // Draw grid lines
    ctx.strokeStyle = '#E5E7EB';
    ctx.lineWidth = 1;
    for (let i = 0; i <= 4; i++) {
        const y = padding + (graphHeight / 4) * i;
        ctx.beginPath();
        ctx.moveTo(padding, y);
        ctx.lineTo(width - padding, y);
        ctx.stroke();
    }
    
    // Draw line chart
    ctx.strokeStyle = color;
    ctx.lineWidth = 2;
    ctx.beginPath();
    
    data.forEach((value, index) => {
        const x = padding + (graphWidth / (data.length - 1)) * index;
        const y = padding + graphHeight - ((value - minValue) / range) * graphHeight;
        
        if (index === 0) {
            ctx.moveTo(x, y);
        } else {
            ctx.lineTo(x, y);
        }
    });
    
    ctx.stroke();
    
    // Draw points
    ctx.fillStyle = color;
    data.forEach((value, index) => {
        const x = padding + (graphWidth / (data.length - 1)) * index;
        const y = padding + graphHeight - ((value - minValue) / range) * graphHeight;
        
        ctx.beginPath();
        ctx.arc(x, y, 3, 0, Math.PI * 2);
        ctx.fill();
    });
}

function changeTimeRange(days) {
    const buttons = document.querySelectorAll('.time-btn');
    buttons.forEach(btn => {
        btn.classList.remove('bg-primary', 'text-white');
        btn.classList.add('bg-gray-100', 'text-gray-600');
    });
    
    event.target.classList.remove('bg-gray-100', 'text-gray-600');
    event.target.classList.add('bg-primary', 'text-white');
    
    // Simulate loading new data
    const hrvData = days === '7' ? [45, 48, 52, 50, 55, 52, 54] :
                   days === '30' ? [42, 45, 48, 46, 50, 52, 51, 53, 52, 54, 55, 53] :
                   [40, 42, 44, 43, 45, 47, 46, 48, 49, 48, 50, 52, 51, 53, 54, 55, 54, 53, 52, 54];
    
    drawLineChart('hrvChart', hrvData, '#EF4444');
}

// Chat functions
function startChat() {
    document.getElementById('chatModal').classList.remove('hidden');
    document.body.style.overflow = 'hidden';
}

function closeChat() {
    document.getElementById('chatModal').classList.add('hidden');
    document.body.style.overflow = 'auto';
}

function startVideoCall() {
    // Simulate video call
    alert('กำลังเชื่อมต่อกับ BioCoach... ฟีเจอร์วิดีโอคอลจะเปิดใช้งานเร็วๆ นี้');
}

// Quick reorder
function quickReorder() {
    // Show loading state
    event.target.innerHTML = '<div class="inline-block animate-spin rounded-full h-5 w-5 border-b-2 border-white"></div>';
    event.target.disabled = true;
    
    setTimeout(() => {
        event.target.innerHTML = '✓ สั่งซื้อสำเร็จ!';
        event.target.classList.remove('bg-primary');
        event.target.classList.add('bg-green-500');
        
        setTimeout(() => {
            event.target.innerHTML = 'สั่งซ้ำ 1 คลิก';
            event.target.disabled = false;
            event.target.classList.remove('bg-green-500');
            event.target.classList.add('bg-primary');
        }, 2000);
    }, 1500);
}

// Notifications
function toggleNotifications() {
    alert('คุณมีการแจ้งเตือนใหม่: อย่าลืมทานวิตามิน ADEK ในช่วงเช้านะครับ!');
}

// Setup event listeners
function setupEventListeners() {
    // Handle checkbox changes
    document.querySelectorAll('input[type="checkbox"]').forEach(checkbox => {
        checkbox.addEventListener('change', function() {
            updateProgress();
        });
    });
}

// Update progress
function updateProgress() {
    const checkboxes = document.querySelectorAll('#plan input[type="checkbox"]');
    const checked = document.querySelectorAll('#plan input[type="checkbox"]:checked');
    const percentage = Math.round((checked.length / checkboxes.length) * 100);
    
    const progressBar = document.querySelector('#plan .bg-primary.h-2');
    const percentageText = document.querySelector('#plan .font-semibold');
    
    if (progressBar) {
        progressBar.style.width = `${percentage}%`;
    }
    if (percentageText) {
        percentageText.textContent = `${percentage}%`;
    }
}

// Update real-time data
function updateRealTimeData() {
    setInterval(() => {
        // Simulate real-time updates
        const stressElement = document.querySelector('.text-yellow-500').parentElement.parentElement.querySelector('.text-2xl');
        if (stressElement && Math.random() > 0.7) {
            const newStress = Math.floor(Math.random() * 20) + 30;
            stressElement.textContent = newStress;
        }
    }, 10000);
}

// Handle pull-to-refresh
let startY = 0;
let isPulling = false;

document.addEventListener('touchstart', function(e) {
    if (window.scrollY === 0) {
        startY = e.touches[0].pageY;
        isPulling = true;
    }
});

document.addEventListener('touchmove', function(e) {
    if (!isPulling) return;
    
    const currentY = e.touches[0].pageY;
    const pullDistance = currentY - startY;
    
    if (pullDistance > 0 && pullDistance < 100) {
        e.preventDefault();
        document.body.style.transform = `translateY(${pullDistance * 0.5}px)`;
    }
});

document.addEventListener('touchend', function(e) {
    if (!isPulling) return;
    
    isPulling = false;
    document.body.style.transform = '';
    
    const currentY = e.changedTouches[0].pageY;
    const pullDistance = currentY - startY;
    
    if (pullDistance > 80) {
        location.reload();
    }
});

// Lazy load images
const imageObserver = new IntersectionObserver((entries, observer) => {
    entries.forEach(entry => {
        if (entry.isIntersecting) {
            const img = entry.target;
            img.src = img.dataset.src;
            observer.unobserve(img);
        }
    });
});

document.querySelectorAll('img[data-src]').forEach(img => {
    imageObserver.observe(img);
});