// Personal Dashboard JavaScript with HTMX Integration

// Constants
const AUTO_REFRESH_INTERVAL = 5 * 60 * 1000; // 5 minutes in milliseconds

// Get CSRF token from body hx-headers attribute
function getCSRFToken() {
    const body = document.body;
    const headers = body.getAttribute('hx-headers');
    if (headers) {
        try {
            const parsed = JSON.parse(headers);
            return parsed['X-CSRF-Token'] || '';
        } catch (e) {
            console.error('Failed to parse CSRF token:', e);
        }
    }
    return '';
}

// Track current active tab (read from URL for state persistence)
const urlParams = new URLSearchParams(window.location.search);
let currentTab = urlParams.get('tab') || 'tasks';
let autoRefreshTimer = null;

// Initialize on page load
document.addEventListener('DOMContentLoaded', function() {
    console.log('Dashboard initialized');

    // Set up HTMX event listeners
    setupHtmxListeners();

    // Start auto-refresh
    startAutoRefresh();
});

// HTMX Event Listeners
function setupHtmxListeners() {
    // Before HTMX request
    document.body.addEventListener('htmx:beforeRequest', function(evt) {
        const target = evt.detail.target;
        if (target.id === 'tab-content') {
            // Show loading state
            target.classList.add('opacity-50', 'pointer-events-none');
        }
    });

    // After HTMX request completes
    document.body.addEventListener('htmx:afterRequest', function(evt) {
        const target = evt.detail.target;
        if (target.id === 'tab-content') {
            // Hide loading state
            target.classList.remove('opacity-50', 'pointer-events-none');

            // Update timestamp
            updateLastUpdatedTime();
        }
    });

    // Handle HTMX errors
    document.body.addEventListener('htmx:responseError', function(evt) {
        console.error('HTMX request failed:', evt.detail);
        alert('Failed to load content. Please try again.');

        // Remove loading state
        const target = evt.detail.target;
        if (target) {
            target.classList.remove('opacity-50', 'pointer-events-none');
        }
    });
}

// Tab Management
function setActiveTab(button) {
    // Remove active class from all tabs
    document.querySelectorAll('.tab-button').forEach(tab => {
        tab.classList.remove('tab-button-active');
    });

    // Add active class to clicked tab
    button.classList.add('tab-button-active');

    // Extract tab name from hx-get attribute
    const endpoint = button.getAttribute('hx-get');
    currentTab = endpoint.split('/').pop(); // "tasks" or "notes"

    console.log('Switched to tab:', currentTab);

    // Reset auto-refresh timer when switching tabs
    resetAutoRefresh();
}

// Manual Refresh
async function refreshData() {
    const button = event.target.closest('button');
    const icon = button.querySelector('svg');

    // Show loading state
    button.disabled = true;
    if (icon) icon.classList.add('animate-spin');

    try {
        // Force API refresh (updates cache)
        const refreshResponse = await fetch('/api/refresh', {
            method: 'POST',
            headers: {
                'X-CSRF-Token': getCSRFToken()
            }
        });

        if (!refreshResponse.ok) throw new Error('Refresh failed');

        // Reload current tab from cache
        const tabResponse = await fetch(`/tabs/${currentTab}`);

        if (!tabResponse.ok) throw new Error('Tab reload failed');

        // Get HTML response and update tab content
        const html = await tabResponse.text();
        const tabContent = document.getElementById('tab-content');
        tabContent.innerHTML = html;
        htmx.process(tabContent);

        // Update timestamp
        updateLastUpdatedTime();

        // Reset auto-refresh timer
        resetAutoRefresh();

        console.log('Manual refresh successful');

    } catch (error) {
        console.error('Refresh failed:', error);
        alert('Failed to refresh data. Please try again.');
    } finally {
        // Restore button state
        button.disabled = false;
        if (icon) icon.classList.remove('animate-spin');
    }
}

// Auto-refresh Functions
function startAutoRefresh() {
    if (autoRefreshTimer) {
        clearInterval(autoRefreshTimer);
    }
    autoRefreshTimer = setInterval(autoRefresh, AUTO_REFRESH_INTERVAL);
    console.log('Auto-refresh started (5 min interval)');
}

function resetAutoRefresh() {
    clearInterval(autoRefreshTimer);
    startAutoRefresh();
}

async function autoRefresh() {
    console.log(`Auto-refreshing ${currentTab} tab...`);

    try {
        // Force API refresh (updates cache)
        const refreshResponse = await fetch('/api/refresh', {
            method: 'POST',
            headers: {
                'X-CSRF-Token': getCSRFToken()
            }
        });

        if (!refreshResponse.ok) throw new Error('Refresh failed');

        // Reload current tab from cache
        const tabResponse = await fetch(`/tabs/${currentTab}`);

        if (tabResponse.ok) {
            const html = await tabResponse.text();
            const tabContent = document.getElementById('tab-content');
            tabContent.innerHTML = html;
            htmx.process(tabContent);
            updateLastUpdatedTime();
            console.log('Auto-refresh successful');
        }
    } catch (error) {
        console.error('Auto-refresh failed:', error);
    }
}

// Update Last Updated Time
function updateLastUpdatedTime() {
    const now = new Date();
    const timeString = now.toLocaleTimeString('en-US', {
        hour: 'numeric',
        minute: '2-digit'
    });
    const element = document.getElementById('last-updated');
    if (element) {
        element.textContent = timeString;
    }
}

// Filter tasks by status (Phase 2 feature)
function filterTasks(status) {
    console.log('Filter tasks:', status);
    // To be implemented in Phase 2
}

// Toggle task completion (Phase 2 feature)
function toggleTask(taskId) {
    console.log('Toggle task:', taskId);
    // To be implemented in Phase 2
}

// Mobile Swipe Navigation
(function() {
    let touchStartX = 0;
    let touchEndX = 0;
    const SWIPE_THRESHOLD = 50; // Minimum px for a swipe

    // Get ordered list of tab names (main tabs only for swipe)
    const TAB_ORDER = ['timeline', 'shopping', 'conditions', 'tasks', 'planning', 'meals'];

    function handleSwipe() {
        const swipeDistance = touchEndX - touchStartX;

        if (Math.abs(swipeDistance) < SWIPE_THRESHOLD) {
            return; // Not a significant swipe
        }

        const currentIndex = TAB_ORDER.indexOf(currentTab);
        if (currentIndex === -1) return;

        let newIndex;
        if (swipeDistance > 0) {
            // Swiped right -> previous tab
            newIndex = currentIndex - 1;
        } else {
            // Swiped left -> next tab
            newIndex = currentIndex + 1;
        }

        // Bounds check
        if (newIndex < 0 || newIndex >= TAB_ORDER.length) {
            return;
        }

        const newTab = TAB_ORDER[newIndex];
        const tabButton = document.querySelector(`[hx-get="/tabs/${newTab}"]`);

        if (tabButton) {
            console.log(`Swipe navigation: ${currentTab} -> ${newTab}`);
            tabButton.click();
        }
    }

    // Set up touch event listeners on the tab content area
    document.addEventListener('DOMContentLoaded', function() {
        const tabContent = document.getElementById('tab-content');
        if (!tabContent) return;

        tabContent.addEventListener('touchstart', function(e) {
            touchStartX = e.changedTouches[0].screenX;
        }, { passive: true });

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