// --- Tab navigation ---
document.querySelectorAll('.tab').forEach(function(btn) {
    btn.addEventListener('click', function() {
        document.querySelectorAll('.tab').forEach(function(t) { t.classList.remove('active'); });
        document.querySelectorAll('.panel').forEach(function(p) { p.classList.remove('active'); });
        btn.classList.add('active');
        document.getElementById('tab-' + btn.dataset.tab).classList.add('active');
        if (btn.dataset.tab === 'wifi') loadWifiConfig();
        if (btn.dataset.tab === 'mqtt') loadMqttConfig();
        if (btn.dataset.tab === 'sleep') loadSleepConfig();
        if (btn.dataset.tab === 'gsm') loadGsmTab();
        if (btn.dataset.tab === 'device') loadDeviceInfo();
    });
});

// --- Toast ---
function toast(msg, ok) {
    var el = document.getElementById('toast');
    el.textContent = msg;
    el.className = 'toast ' + (ok ? 'ok' : 'err');
    setTimeout(function() { el.classList.add('hidden'); }, 3000);
}

// --- API helpers ---
function api(url, opts) {
    return fetch(url, opts).then(function(r) { return r.json(); });
}
function postJson(url, data) {
    return api(url, {
        method: 'POST',
        headers: { 'Content-Type': 'application/json' },
        body: JSON.stringify(data)
    });
}

// --- Formatting ---
function fmtUptime(sec) {
    var d = Math.floor(sec / 86400);
    var h = Math.floor((sec % 86400) / 3600);
    var m = Math.floor((sec % 3600) / 60);
    var s = sec % 60;
    var parts = [];
    if (d > 0) parts.push(d + 'd');
    if (h > 0) parts.push(h + 'h');
    if (m > 0) parts.push(m + 'm');
    parts.push(s + 's');
    return parts.join(' ');
}
function fmtBytes(b) {
    if (b >= 1048576) return (b / 1048576).toFixed(1) + ' MB';
    if (b >= 1024) return (b / 1024).toFixed(0) + ' KB';
    return b + ' B';
}
function setDot(id, on) {
    var el = document.getElementById(id);
    if (el) { el.className = 'dot ' + (on ? 'on' : 'off'); }
}

// --- Status Tab ---
function loadStatus() {
    api('/api/status').then(function(d) {
        document.getElementById('s-devid').textContent = d.device_id;
        document.getElementById('s-fw').textContent = 'v' + d.firmware_version;
        document.getElementById('s-uptime').textContent = fmtUptime(d.uptime_sec);

        setDot('hdr-status', d.wifi_connected || d.gsm_connected);
        setDot('s-wifi-dot', d.wifi_connected);
        setDot('s-mqtt-dot', d.mqtt_connected);
        setDot('s-gsm-dot', d.gsm_connected);
        setDot('s-mb-dot', d.modbus_connected);

        document.getElementById('s-wifi').textContent =
            d.wifi_connected ? 'WiFi: ' + d.wifi_ssid + ' (' + d.wifi_rssi + ' dBm)' : 'WiFi: Disconnected';
        document.getElementById('s-mqtt').textContent =
            d.mqtt_connected ? 'MQTT: Connected' : 'MQTT: Disconnected';
        document.getElementById('s-gsm').textContent =
            d.gsm_connected ? 'GSM: Connected (' + d.gsm_signal + '%)' :
            (d.gsm_available ? 'GSM: Disconnected' : 'GSM: Not available');
        document.getElementById('s-modbus').textContent =
            'Modbus: ' + d.modbus_success_count + ' ok / ' + d.modbus_error_count + ' err';

        setDot('s-sd-dot', d.sd_available);
        document.getElementById('s-sd').textContent =
            d.sd_available ? 'SD: Available' : 'SD: Not available';
        document.getElementById('s-sd-queued').textContent = d.sd_queued_records + ' records';
    });

    if (document.getElementById('s-sd-files')) {
        api('/api/sd/status').then(function(d) {
            if (d.available) {
                document.getElementById('s-sd').textContent =
                    'SD: ' + fmtBytes(d.total_bytes) + ' (' +
                    (d.total_bytes > 0 ? Math.round(d.used_bytes * 100 / d.total_bytes) : 0) + '% used)';
                document.getElementById('s-sd-files').textContent = d.file_count;
                document.getElementById('s-sd-retention').textContent = d.retention_days + ' days';
            } else {
                document.getElementById('s-sd-files').textContent = '--';
                document.getElementById('s-sd-retention').textContent = '--';
            }
        });
    }

    api('/api/telemetry/latest').then(function(d) {
        var el = document.getElementById('s-readings');
        if (!d.valid) {
            el.innerHTML = '<p class="muted">No data yet</p>';
            return;
        }
        var v = d.v, i = d.i, p = d.p;
        el.innerHTML =
            '<div class="readings-grid">' +
            rd('Va', v.a, 'V') + rd('Vb', v.b, 'V') + rd('Vc', v.c, 'V') +
            rd('Ia', i.a, 'A') + rd('Ib', i.b, 'A') + rd('Ic', i.c, 'A') +
            rd('P', p.total, 'kW') + rd('Q', p.reactive, 'kVAR') + rd('S', p.apparent, 'kVA') +
            rd('PF', p.pf, '') + rd('F', d.f, 'Hz') + rd('Import', d.e.imp_act, 'kWh') +
            '</div>';
    });
}
function rd(label, value, unit) {
    return '<div class="rd"><div class="lbl">' + label + '</div><div class="val">' + value + ' ' + unit + '</div></div>';
}

// --- WiFi Tab ---
function loadWifiConfig() {
    api('/api/wifi/config').then(function(d) {
        document.getElementById('w-enabled').checked = d.enabled;
        document.getElementById('w-ssid').value = d.ssid || '';
        document.getElementById('w-current').textContent =
            d.connected ? d.ssid + ' (' + d.ip + ')' : 'Not connected';
    });
}
function scanWifi() {
    var el = document.getElementById('w-networks');
    el.innerHTML = '<p class="muted">Scanning...</p>';
    doScan();
}
function doScan() {
    api('/api/wifi/scan').then(function(d) {
        if (d.scanning) {
            setTimeout(doScan, 1500);
            return;
        }
        var el = document.getElementById('w-networks');
        if (!d.networks || d.networks.length === 0) {
            el.innerHTML = '<p class="muted">No networks found</p>';
            return;
        }
        var html = '';
        d.networks.forEach(function(n) {
            html += '<div class="net-item" onclick="selectNetwork(\'' +
                n.ssid.replace(/'/g, "\\'") + '\')">' +
                '<span class="ssid">' + n.ssid + '</span>' +
                '<span class="meta">' + n.rssi + ' dBm &middot; ' + n.encryption + '</span></div>';
        });
        el.innerHTML = html;
    });
}
function selectNetwork(ssid) {
    document.getElementById('w-ssid').value = ssid;
    document.getElementById('w-pass').focus();
}
function saveWifi() {
    postJson('/api/wifi/config', {
        ssid: document.getElementById('w-ssid').value,
        password: document.getElementById('w-pass').value,
        enabled: document.getElementById('w-enabled').checked
    }).then(function(d) {
        toast(d.message, d.success);
    });
}

// --- MQTT Tab ---
function loadMqttConfig() {
    api('/api/mqtt/config').then(function(d) {
        document.getElementById('m-broker').value = d.broker || '';
        document.getElementById('m-port').value = d.port;
        document.getElementById('m-user').value = d.username || '';
        document.getElementById('m-prefix').value = d.topic_prefix || 'acuvim';
        document.getElementById('m-tls').checked = d.tls;
        document.getElementById('m-status').textContent = d.connected ? 'Connected' : 'Disconnected';
    });
    api('/api/console/config').then(function(d) {
        document.getElementById('c-url').value = d.url || '';
    });
}
function saveMqtt() {
    postJson('/api/mqtt/config', {
        broker: document.getElementById('m-broker').value,
        port: parseInt(document.getElementById('m-port').value) || 1883,
        username: document.getElementById('m-user').value,
        password: document.getElementById('m-pass').value,
        topic_prefix: document.getElementById('m-prefix').value,
        tls: document.getElementById('m-tls').checked
    }).then(function(d) {
        toast(d.message, d.success);
    });
}
function saveConsole() {
    postJson('/api/console/config', {
        url: document.getElementById('c-url').value
    }).then(function(d) {
        toast(d.message, d.success);
    });
}

// --- Sleep Tab ---
function loadSleepConfig() {
    api('/api/sleep/config').then(function(d) {
        document.getElementById('sl-dur').value = d.sleep_duration_min;
        document.getElementById('sl-wake').value = d.wake_duration_sec;
        document.getElementById('sl-poll').value = d.poll_interval_sec;
        document.getElementById('sl-hb').value = d.heartbeat_interval_sec;
    });
}
function saveSleep() {
    postJson('/api/sleep/config', {
        sleep_duration_min: parseInt(document.getElementById('sl-dur').value) || 0,
        wake_duration_sec: parseInt(document.getElementById('sl-wake').value) || 300
    }).then(function(d) {
        toast(d.message, d.success);
    });
}
function savePolling() {
    postJson('/api/sleep/config', {
        poll_interval_sec: parseInt(document.getElementById('sl-poll').value) || 5,
        heartbeat_interval_sec: parseInt(document.getElementById('sl-hb').value) || 60
    }).then(function(d) {
        toast(d.message, d.success);
    });
}

// --- Device Tab ---
function loadDeviceInfo() {
    api('/api/device/info').then(function(d) {
        document.getElementById('d-id').textContent = d.device_id;
        document.getElementById('d-fw').textContent = 'v' + d.firmware_version;
        document.getElementById('d-hw').textContent = d.hardware;
        document.getElementById('d-mac').textContent = d.mac_address;
        document.getElementById('d-heap').textContent = fmtBytes(d.free_heap);
        document.getElementById('d-flash').textContent = fmtBytes(d.flash_size);
        document.getElementById('d-psram').textContent = fmtBytes(d.psram_size);
    });
    api('/api/modbus/config').then(function(d) {
        document.getElementById('mb-addr').value = d.slave_address;
        document.getElementById('mb-baud').value = d.baud_rate;
    });
    loadOtaStatus();
}
function saveModbus() {
    postJson('/api/modbus/config', {
        slave_address: parseInt(document.getElementById('mb-addr').value) || 1,
        baud_rate: parseInt(document.getElementById('mb-baud').value) || 9600
    }).then(function(d) {
        toast(d.message, d.success);
    });
}
function saveGsm() {
    postJson('/api/gsm/config', {
        enabled: document.getElementById('g-enabled').checked,
        apn: document.getElementById('g-apn').value,
        username: document.getElementById('g-user').value,
        password: document.getElementById('g-pass').value
    }).then(function(d) {
        toast(d.message, d.success);
    });
}

// --- GSM Tab ---
function loadGsmTab() {
    api('/api/gsm/status').then(function(d) {
        document.getElementById('g-modem').textContent = d.modem_available ? 'Detected' : 'Not found';
        document.getElementById('g-sim').textContent = d.sim_inserted ? 'Inserted' : 'Not detected';
        document.getElementById('g-status').textContent = d.connected ? 'Connected' : 'Disconnected';
        setDot('g-status-dot', d.connected);
        document.getElementById('g-operator').textContent = d.operator || '--';
        document.getElementById('g-signal').textContent =
            d.signal_percent > 0 ? d.signal_percent + '% (CSQ: ' + d.signal_quality + ')' : '--';
        document.getElementById('g-imei').textContent = d.imei || '--';
        document.getElementById('g-iccid').textContent = d.iccid || '--';
    });
    api('/api/gsm/config').then(function(d) {
        document.getElementById('g-enabled').checked = d.enabled;
        document.getElementById('g-apn').value = d.apn || '';
        document.getElementById('g-user').value = d.username || '';
    });
    api('/api/transport/config').then(function(d) {
        var radios = document.querySelectorAll('input[name="t-prio"]');
        radios.forEach(function(r) { r.checked = (parseInt(r.value) === d.priority); });
        document.getElementById('g-poll').value = d.gsm_poll_interval_sec;
        document.getElementById('g-batch').checked = d.gsm_batch_enabled;
        document.getElementById('g-batchsize').value = d.gsm_batch_size;
    });
}
function saveTransport() {
    var prio = 0;
    document.querySelectorAll('input[name="t-prio"]').forEach(function(r) {
        if (r.checked) prio = parseInt(r.value);
    });
    postJson('/api/transport/config', {
        priority: prio,
        gsm_poll_interval_sec: parseInt(document.getElementById('g-poll').value) || 30,
        gsm_batch_enabled: document.getElementById('g-batch').checked,
        gsm_batch_size: parseInt(document.getElementById('g-batchsize').value) || 6
    }).then(function(d) {
        toast(d.message, d.success);
    });
}
// --- OTA ---
function loadOtaStatus() {
    api('/api/ota/status').then(function(d) {
        document.getElementById('ota-ver').textContent = 'v' + d.firmware_version;
        document.getElementById('ota-part').textContent = d.running_partition;
        var statusNames = ['Idle', 'Checking...', 'Downloading...', 'Installing...', 'Success', 'Failed'];
        var statusText = statusNames[d.status] || 'Unknown';
        if (d.progress > 0 && d.status >= 2 && d.status <= 3) {
            statusText += ' (' + d.progress + '%)';
        }
        if (d.message && d.status === 5) {
            statusText += ': ' + d.message;
        }
        document.getElementById('ota-status').textContent = statusText;

        var valEl = document.getElementById('ota-validation');
        valEl.style.display = d.needs_validation ? 'block' : 'none';

        if (d.update_available && d.available) {
            var infoEl = document.getElementById('ota-update-info');
            infoEl.style.display = 'block';
            document.getElementById('ota-avail-ver').textContent = 'v' + d.available.version;
            document.getElementById('ota-avail-size').textContent = fmtBytes(d.available.size);
            document.getElementById('ota-avail-notes').textContent = d.available.release_notes || '';
        }
    });
    api('/api/ota/config').then(function(d) {
        document.getElementById('ota-auto').value = d.auto_update;
        document.getElementById('ota-interval').value = d.check_interval_hours;
    });
}
function checkOtaUpdate() {
    api('/api/ota/check', { method: 'POST' }).then(function(d) {
        toast(d.message, d.success);
        if (d.update_available) {
            var infoEl = document.getElementById('ota-update-info');
            infoEl.style.display = 'block';
            document.getElementById('ota-avail-ver').textContent = 'v' + d.version;
            document.getElementById('ota-avail-size').textContent = fmtBytes(d.size);
            document.getElementById('ota-avail-notes').textContent = d.release_notes || '';
        }
    });
}
function installOtaAvailable() {
    if (!confirm('Install the available firmware update? Device will reboot.')) return;
    api('/api/ota/status').then(function(d) {
        if (d.update_available && d.available) {
            postJson('/api/ota/install', { url: d.available ? d.available.url || '' : '' }).then(function(r) {
                toast(r.message, r.success);
            });
        }
    });
}
function saveOtaConfig() {
    postJson('/api/ota/config', {
        check_interval_hours: parseInt(document.getElementById('ota-interval').value) || 6,
        auto_update: parseInt(document.getElementById('ota-auto').value) || 1
    }).then(function(d) {
        toast(d.message, d.success);
    });
}
function markOtaValid() {
    postJson('/api/ota/install', { mark_valid: true }).then(function() {
        toast('Firmware marked as valid', true);
        loadOtaStatus();
    });
}
function rollbackOta() {
    if (!confirm('Rollback to previous firmware? Device will reboot.')) return;
    api('/api/ota/rollback', { method: 'POST' }).then(function(d) {
        toast(d.message, d.success);
    });
}
function uploadFirmware() {
    var fileEl = document.getElementById('ota-file');
    if (!fileEl.files.length) {
        toast('Select a firmware file', false);
        return;
    }
    if (!confirm('Upload and install firmware? Device will reboot.')) return;

    var formData = new FormData();
    formData.append('firmware', fileEl.files[0]);

    var progEl = document.getElementById('ota-progress');
    var barEl = document.getElementById('ota-progress-bar');
    var textEl = document.getElementById('ota-progress-text');
    progEl.style.display = 'block';

    var xhr = new XMLHttpRequest();
    xhr.open('POST', '/api/ota/upload');
    xhr.upload.addEventListener('progress', function(e) {
        if (e.lengthComputable) {
            var pct = Math.round(e.loaded * 100 / e.total);
            barEl.style.width = pct + '%';
            textEl.textContent = pct + '%';
        }
    });
    xhr.onload = function() {
        if (xhr.status === 200) {
            toast('Upload complete. Rebooting...', true);
        } else {
            toast('Upload failed', false);
            progEl.style.display = 'none';
        }
    };
    xhr.onerror = function() {
        toast('Upload error', false);
        progEl.style.display = 'none';
    };
    xhr.send(formData);
}

// --- SD Card ---
function drainSd() {
    postJson('/api/sd/drain', {}).then(function(d) {
        toast(d.message, d.success);
    });
}
function cleanupSd() {
    if (!confirm('Delete old buffered files?')) return;
    postJson('/api/sd/cleanup', {}).then(function(d) {
        toast(d.message, d.success);
    });
}

function restartDevice() {
    if (!confirm('Restart the device?')) return;
    postJson('/api/device/restart', {}).then(function(d) {
        toast(d.message, d.success);
    });
}
function factoryReset() {
    if (!confirm('Factory reset will erase ALL settings. Continue?')) return;
    if (!confirm('Are you sure? This cannot be undone.')) return;
    postJson('/api/device/factory-reset', {}).then(function(d) {
        toast(d.message, d.success);
    });
}

// --- Auto-refresh status ---
loadStatus();
setInterval(loadStatus, 5000);