// Initialize app
let currentView = 'dashboardView';
let selectedMood = null;
let charts = {};

// View management
function showView(viewId) {
    // Hide all views
    document.querySelectorAll('.view').forEach(view => {
        view.classList.add('hidden');
    });
    
    // Show selected view
    document.getElementById(viewId).classList.remove('hidden');
    
    // Update navigation
    document.querySelectorAll('.nav-btn').forEach(btn => {
        btn.classList.remove('active');
        if (btn.dataset.view === viewId) {
            btn.classList.add('active');
        }
    });
    
    currentView = viewId;
    
    // Initialize charts for specific views
    if (viewId === 'strainView') {
        initializeStrainCharts();
    } else if (viewId === 'sleepView') {
        initializeSleepCharts();
    } else if (viewId === 'recoveryView') {
        initializeRecoveryChart();
    }
    
    // Re-initialize feather icons
    feather.replace();
}

function showJournal() {
    showView('journalView');
}

function showProfile() {
    // Placeholder for profile modal
    alert('Profile feature coming soon!');
}

// Initialize charts
function initializeStrainCharts() {
    // Strain Gauge
    const strainGaugeCtx = document.getElementById('strainGauge');
    if (strainGaugeCtx && !charts.strainGauge) {
        charts.strainGauge = new Chart(strainGaugeCtx, {
            type: 'doughnut',
            data: {
                datasets: [{
                    data: [41, 59],
                    backgroundColor: ['#eab308', '#fef3c7'],
                    borderWidth: 0
                }]
            },
            options: {
                responsive: true,
                maintainAspectRatio: false,
                cutout: '70%',
                plugins: {
                    legend: { display: false },
                    tooltip: { enabled: false }
                }
            }
        });
    }
    
    // Hourly Strain Chart
    const hourlyStrainCtx = document.getElementById('hourlyStrainChart');
    if (hourlyStrainCtx && !charts.hourlyStrain) {
        const hours = Array.from({length: 24}, (_, i) => `${i}:00`);
        const strainData = [
            2, 2, 1, 1, 2, 3, 8, 12, 5, 4, 3, 5, 8, 6, 4, 3, 4, 7, 3, 2, 2, 2, 1, 1
        ];
        
        charts.hourlyStrain = new Chart(hourlyStrainCtx, {
            type: 'line',
            data: {
                labels: hours,
                datasets: [{
                    label: 'Strain',
                    data: strainData,
                    borderColor: '#eab308',
                    backgroundColor: 'rgba(234, 179, 8, 0.1)',
                    fill: true,
                    tension: 0.4,
                    pointRadius: 2,
                    pointHoverRadius: 4
                }]
            },
            options: {
                responsive: true,
                maintainAspectRatio: false,
                scales: {
                    y: {
                        beginAtZero: true,
                        max: 21,
                        grid: {
                            color: 'rgba(0, 0, 0, 0.05)'
                        }
                    },
                    x: {
                        grid: {
                            display: false
                        }
                    }
                },
                plugins: {
                    legend: { display: false }
                }
            }
        });
    }
}

function initializeSleepCharts() {
    // Sleep Stages Chart
    const sleepStagesCtx = document.getElementById('sleepStagesChart');
    if (sleepStagesCtx && !charts.sleepStages) {
        const timeLabels = Array.from({length: 24}, (_, i) => {
            const hour = i < 10 ? `0${i}:00` : `${i}:00`;
            return hour;
        });
        
        const sleepData = timeLabels.map((_, i) => {
            if (i < 22 || i > 23) return 0;
            if (i === 22) return 2;
            if (i === 23) return 3;
            return i % 4 + 1;
        });
        
        charts.sleepStages = new Chart(sleepStagesCtx, {
            type: 'bar',
            data: {
                labels: timeLabels,
                datasets: [{
                    label: 'Sleep Stage',
                    data: sleepData,
                    backgroundColor: sleepData.map(value => {
                        if (value === 0) return '#e5e7eb';
                        if (value === 1) return '#ddd6fe';
                        if (value === 2) return '#93c5fd';
                        if (value === 3) return '#60a5fa';
                        return '#8b5cf6';
                    }),
                    borderWidth: 0
                }]
            },
            options: {
                responsive: true,
                maintainAspectRatio: false,
                scales: {
                    y: {
                        display: false,
                        max: 4
                    },
                    x: {
                        ticks: {
                            maxTicksLimit: 12
                        },
                        grid: {
                            display: false
                        }
                    }
                },
                plugins: {
                    legend: { display: false },
                    tooltip: {
                        callbacks: {
                            label: function(context) {
                                const stages = ['', 'Light Sleep', 'Deep Sleep', 'REM Sleep', 'Awake'];
                                return stages[context.parsed.y] || 'Awake';
                            }
                        }
                    }
                }
            }
        });
    }
}

function initializeRecoveryChart() {
    // Recovery Ring Chart
    const recoveryRingCtx = document.getElementById('recoveryRing');
    if (recoveryRingCtx && !charts.recoveryRing) {
        charts.recoveryRing = new Chart(recoveryRingCtx, {
            type: 'doughnut',
            data: {
                datasets: [{
                    data: [78, 22],
                    backgroundColor: ['#10b981', '#d1fae5'],
                    borderWidth: 0
                }]
            },
            options: {
                responsive: true,
                maintainAspectRatio: false,
                cutout: '75%',
                plugins: {
                    legend: { display: false },
                    tooltip: { enabled: false }
                }
            }
        });
    }
}

// Journal functionality
document.addEventListener('DOMContentLoaded', function() {
    // Mood buttons
    document.querySelectorAll('.mood-btn').forEach(btn => {
        btn.addEventListener('click', function() {
            document.querySelectorAll('.mood-btn').forEach(b => b.classList.remove('selected'));
            this.classList.add('selected');
            selectedMood = parseInt(this.dataset.mood);
        });
    });
    
    // Energy slider
    const energySlider = document.getElementById('energyLevel');
    const energyValue = document.getElementById('energyValue');
    if (energySlider && energyValue) {
        energySlider.addEventListener('input', function() {
            energyValue.textContent = this.value;
        });
    }
    
    // Stress slider
    const stressSlider = document.getElementById('stressLevel');
    const stressValue = document.getElementById('stressValue');
    if (stressSlider && stressValue) {
        stressSlider.addEventListener('input', function() {
            stressValue.textContent = this.value;
        });
    }
    
    // Journal form submission
    const journalForm = document.getElementById('journalForm');
    if (journalForm) {
        journalForm.addEventListener('submit', function(e) {
            e.preventDefault();
            
            const formData = {
                mood: selectedMood,
                energy: document.getElementById('energyLevel').value,
                stress: document.getElementById('stressLevel').value,
                activities: Array.from(document.querySelectorAll('.activity-checkbox:checked')).map(cb => cb.value),
                nutrition: Array.from(document.querySelectorAll('.nutrition-checkbox:checked')).map(cb => cb.value),
                notes: document.getElementById('journalNotes').value,
                timestamp: new Date().toISOString()
            };
            
            // Save to localStorage (in real app, would send to server)
            let journalEntries = JSON.parse(localStorage.getItem('journalEntries') || '[]');
            journalEntries.push(formData);
            localStorage.setItem('journalEntries', JSON.stringify(journalEntries));
            
            // Show success message
            showNotification('Journal entry saved successfully!');
            
            // Reset form
            journalForm.reset();
            document.querySelectorAll('.mood-btn').forEach(b => b.classList.remove('selected'));
            selectedMood = null;
            
            // Go back to dashboard after a short delay
            setTimeout(() => showView('dashboardView'), 1500);
        });
    }
});

// Notification system
function showNotification(message, type = 'success') {
    const notification = document.createElement('div');
    notification.className = `fixed top-20 left-4 right-4 max-w-md mx-auto px-4 py-3 rounded-lg shadow-lg z-50 transform transition-all duration-300 ${
        type === 'success' ? 'bg-emerald-500 text-white' : 'bg-red-500 text-white'
    }`;
    notification.innerHTML = `
        <div class="flex items-center space-x-2">
            <i data-feather="${type === 'success' ? 'check-circle' : 'alert-circle'}" class="w-5 h-5"></i>
            <span>${message}</span>
        </div>
    `;
    
    document.body.appendChild(notification);
    feather.replace();
    
    // Animate in
    setTimeout(() => {
        notification.classList.add('translate-y-0');
    }, 100);
    
    // Remove after 3 seconds
    setTimeout(() => {
        notification.classList.add('translate-y-full', 'opacity-0');
        setTimeout(() => notification.remove(), 300);
    }, 3000);
}

// Simulate real-time data updates
function updateMetrics() {
    // Update heart rate with slight variation
    const heartRateElements = document.querySelectorAll('[data-metric="heart-rate"]');
    heartRateElements.forEach(el => {
        const currentRate = parseInt(el.textContent);
        const variation = Math.floor(Math.random() * 3) - 1;
        const newRate = Math.max(50, Math.min(60, currentRate + variation));
        el.textContent = newRate + ' bpm';
    });
}

// Initialize app on load
window.addEventListener('load', function() {
    showView('dashboardView');
    
    // Update metrics every 30 seconds
    setInterval(updateMetrics, 30000);
});

// Handle page visibility changes
document.addEventListener('visibilitychange', function() {
    if (!document.hidden) {
        // Refresh data when page becomes visible again
        if (currentView === 'strainView') {
            initializeStrainCharts();
        } else if (currentView === 'sleepView') {
            initializeSleepCharts();
        } else if (currentView === 'recoveryView') {
            initializeRecoveryChart();
        }
    }
});

// Touch gestures for mobile
let touchStartX = 0;
let touchEndX = 0;

document.addEventListener('touchstart', function(e) {
    touchStartX = e.changedTouches[0].screenX;
});

document.addEventListener('touchend', function(e) {
    touchEndX = e.changedTouches[0].screenX;
    handleSwipe();
});

function handleSwipe() {
    const swipeThreshold = 50;
    const diff = touchStartX - touchEndX;
    
    if (Math.abs(diff) > swipeThreshold) {
        const views = ['dashboardView', 'strainView', 'sleepView', 'recoveryView', 'journalView'];
        const currentIndex = views.indexOf(currentView);
        
        if (diff > 0 && currentIndex < views.length - 1) {
            // Swipe left - next view
            showView(views[currentIndex + 1]);
        } else if (diff < 0 && currentIndex > 0) {
            // Swipe right - previous view
            showView(views[currentIndex - 1]);
        }
    }
}