/* HAMeter Web UI - JavaScript */

// ----------------------------------------------------------------
// SSE (Server-Sent Events) connection
// ----------------------------------------------------------------
let eventSource = null;

function connectSSE() {
    if (eventSource) {
        eventSource.close();
    }

    eventSource = new EventSource('/api/events');

    eventSource.addEventListener('status', function(e) {
        const data = JSON.parse(e.data);
        updateStatus(data);
    });

    eventSource.addEventListener('readings', function(e) {
        const data = JSON.parse(e.data);
        updateReadings(data);
    });

    eventSource.addEventListener('costs', function(e) {
        const data = JSON.parse(e.data);
        updateCosts(data);
    });

    eventSource.addEventListener('discovery', function(e) {
        const data = JSON.parse(e.data);
        if (typeof window._onDiscoveryUpdate === 'function') {
            window._onDiscoveryUpdate(data);
        }
    });

    eventSource.addEventListener('logs', function(e) {
        const data = JSON.parse(e.data);
        if (typeof window._onLogUpdate === 'function') {
            window._onLogUpdate(data);
        }
    });

    eventSource.onerror = function() {
        // Auto-reconnect is built into EventSource
        updateStatusDot('error');
    };
}

// ----------------------------------------------------------------
// Status updates
// ----------------------------------------------------------------
function updateStatus(data) {
    updateStatusDot(data.status);

    // Update sidebar status
    const statusText = document.querySelector('.status-text');
    if (statusText) {
        const labels = {
            'unconfigured': 'Not Configured',
            'stopped': 'Stopped',
            'starting': 'Starting...',
            'running': 'Running',
            'restarting': 'Restarting...',
            'discovery': 'Discovery Mode',
            'error': 'Error',
        };
        statusText.textContent = labels[data.status] || data.status;
    }
}

function updateStatusDot(status) {
    const dot = document.querySelector('.status-dot');
    if (dot) {
        dot.className = 'status-dot ' + status;
    }
}

// ----------------------------------------------------------------
// Readings updates (dashboard)
// ----------------------------------------------------------------
function updateReadings(readings) {
    for (const [meterId, data] of Object.entries(readings)) {
        const readingEl = document.querySelector('#reading-' + meterId + ' .reading-value');
        if (readingEl) {
            readingEl.textContent = formatNumber(data.calibrated_consumption);
        }

        const rawEl = document.getElementById('raw-' + meterId);
        if (rawEl) {
            rawEl.textContent = formatNumber(data.raw_consumption);
        }

        const lastSeenEl = document.getElementById('lastseen-' + meterId);
        if (lastSeenEl) {
            lastSeenEl.textContent = data.timestamp || '--';
        }

        const countEl = document.getElementById('count-' + meterId);
        if (countEl) {
            countEl.textContent = data.count || 0;
        }

        // Update cost display if present
        const costEl = document.getElementById('cost-' + meterId);
        if (costEl && data.cumulative_cost !== undefined) {
            costEl.textContent = '$' + Number(data.cumulative_cost).toFixed(2);
        }
    }
}

// ----------------------------------------------------------------
// Cost updates (dashboard)
// ----------------------------------------------------------------
function updateCosts(costs) {
    for (const [meterId, data] of Object.entries(costs)) {
        const costEl = document.getElementById('cost-' + meterId);
        if (costEl) {
            costEl.textContent = '$' + Number(data.cumulative_cost).toFixed(2);
        }

        const billingStartEl = document.getElementById('billing-start-' + meterId);
        if (billingStartEl) {
            billingStartEl.textContent = data.billing_period_start || '--';
        }

        const fixedEl = document.getElementById('fixed-charges-' + meterId);
        if (fixedEl) {
            fixedEl.textContent = '$' + Number(data.fixed_charges_applied).toFixed(2);
        }
    }
}

function formatNumber(n) {
    if (n === null || n === undefined) return '--';
    return Number(n).toLocaleString(undefined, {
        minimumFractionDigits: 0,
        maximumFractionDigits: 4,
    });
}

// ----------------------------------------------------------------
// Toast notifications
// ----------------------------------------------------------------
function showToast(message, type) {
    type = type || 'info';
    const container = document.getElementById('toast-container');
    if (!container) return;

    const toast = document.createElement('div');
    toast.className = 'toast toast-' + type;
    toast.textContent = message;
    container.appendChild(toast);

    setTimeout(function() {
        toast.style.opacity = '0';
        toast.style.transition = 'opacity 0.3s';
        setTimeout(function() { toast.remove(); }, 300);
    }, 4000);
}

// ----------------------------------------------------------------
// Restart banner
// ----------------------------------------------------------------
function showRestartBanner() {
    const banner = document.getElementById('restart-banner');
    if (banner) {
        banner.classList.remove('hidden');
    } else {
        // Create one dynamically if not on a page with one
        showToast('Pipeline restart required to apply changes', 'info');
    }
}

// ----------------------------------------------------------------
// Pipeline control
// ----------------------------------------------------------------
function restartPipeline() {
    if (!confirm('Restart the pipeline? Meter monitoring will briefly pause.')) return;

    fetch('/api/pipeline/restart', { method: 'POST' })
        .then(function(r) { return r.json(); })
        .then(function(data) {
            if (data.ok) {
                showToast('Pipeline restarting...', 'info');
                // Hide restart banner if visible
                const banner = document.getElementById('restart-banner');
                if (banner) banner.classList.add('hidden');
            }
        })
        .catch(function(e) {
            showToast('Failed to restart: ' + e.message, 'error');
        });
}

// ----------------------------------------------------------------
// Cost actions
// ----------------------------------------------------------------
function resetBillingPeriod(meterId) {
    if (!confirm('Reset the billing period for this meter? Cost will be set to $0.00.')) return;

    fetch('/api/costs/' + meterId + '/reset', { method: 'POST' })
        .then(function(r) { return r.json(); })
        .then(function(data) {
            if (data.ok) {
                showToast('Billing period reset', 'success');
                var costEl = document.getElementById('cost-' + meterId);
                if (costEl) costEl.textContent = '$0.00';
            } else {
                showToast(data.error || 'Reset failed', 'error');
            }
        })
        .catch(function(e) {
            showToast('Failed: ' + e.message, 'error');
        });
}

function addFixedCharges(meterId) {
    if (!confirm('Add fixed charges to this meter?')) return;

    fetch('/api/costs/' + meterId + '/add-fixed', { method: 'POST' })
        .then(function(r) { return r.json(); })
        .then(function(data) {
            if (data.ok) {
                showToast('Added $' + Number(data.fixed_added).toFixed(2) + ' fixed charges', 'success');
                var costEl = document.getElementById('cost-' + meterId);
                if (costEl) costEl.textContent = '$' + Number(data.cumulative_cost).toFixed(2);
            } else {
                showToast(data.error || 'Failed to add charges', 'error');
            }
        })
        .catch(function(e) {
            showToast('Failed: ' + e.message, 'error');
        });
}

// ----------------------------------------------------------------
// Sidebar toggle (mobile)
// ----------------------------------------------------------------
function toggleSidebar() {
    const sidebar = document.getElementById('sidebar');
    if (sidebar) {
        sidebar.classList.toggle('open');
    }
}

// ----------------------------------------------------------------
// Password toggle
// ----------------------------------------------------------------
function togglePassword(inputId) {
    const input = document.getElementById(inputId);
    if (!input) return;
    if (input.type === 'password') {
        input.type = 'text';
    } else {
        input.type = 'password';
    }
}

// ----------------------------------------------------------------
// Init
// ----------------------------------------------------------------
document.addEventListener('DOMContentLoaded', function() {
    // Only connect SSE on pages with the sidebar (not setup page)
    if (document.querySelector('.sidebar')) {
        connectSSE();
    }
});